sys/src/cmd/audio/libFLAC/stream_decoder.c

   1 /* libFLAC - Free Lossless Audio Codec library
   2  * Copyright (C) 2000-2009  Josh Coalson
   3  * Copyright (C) 2011-2016  Xiph.Org Foundation
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  *
  12  * - Redistributions in binary form must reproduce the above copyright
  13  * notice, this list of conditions and the following disclaimer in the
  14  * documentation and/or other materials provided with the distribution.
  15  *
  16  * - Neither the name of the Xiph.org Foundation nor the names of its
  17  * contributors may be used to endorse or promote products derived from
  18  * this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  23  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
  24  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  26  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  27  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  28  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  29  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  30  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #ifdef HAVE_CONFIG_H
  34 #  include <config.h>
  35 #endif
  36
  37 #include <stdio.h>
  38 #include <stdlib.h> /* for malloc() */
  39 #include <string.h> /* for memset/memcpy() */
  40 #include <sys/stat.h> /* for stat() */
  41 #include <sys/types.h> /* for off_t */
  42 #include "share/compat.h"
  43 #include "FLAC/assert.h"
  44 #include "share/alloc.h"
  45 #include "protected/stream_decoder.h"
  46 #include "private/bitreader.h"
  47 #include "private/bitmath.h"
  48 #include "private/cpu.h"
  49 #include "private/crc.h"
  50 #include "private/fixed.h"
  51 #include "private/format.h"
  52 #include "private/lpc.h"
  53 #include "private/md5.h"
  54 #include "private/memory.h"
  55 #include "private/macros.h"
  56
  57
  58 /* technically this should be in an "export.c" but this is convenient enough */
  59 FLAC_API int FLAC_API_SUPPORTS_OGG_FLAC = FLAC__HAS_OGG;
  60
  61
  62 /***********************************************************************
  63  *
  64  * Private static data
  65  *
  66  ***********************************************************************/
  67
  68 static const FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' };
  69
  70 /***********************************************************************
  71  *
  72  * Private class method prototypes
  73  *
  74  ***********************************************************************/
  75
  76 static void set_defaults_(FLAC__StreamDecoder *decoder);
  77 static FILE *get_binary_stdin_(void);
  78 static FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, uint32_t size, uint32_t channels);
  79 static FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id);
  80 static FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder);
  81 static FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder);
  82 static FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length);
  83 static FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length);
  84 static FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj, uint32_t length);
  85 static FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj);
  86 static FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj);
  87 static FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder);
  88 static FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder);
  89 static FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode);
  90 static FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder);
  91 static FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode);
  92 static FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode);
  93 static FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode);
  94 static FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode);
  95 static FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode);
  96 static FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, uint32_t predictor_order, uint32_t partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended);
  97 static FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder);
  98 static FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data);
  99 #if FLAC__HAS_OGG
 100 static FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes);
 101 static FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
 102 #endif
 103 static FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[]);
 104 static void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status);
 105 static FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample);
 106 #if FLAC__HAS_OGG
 107 static FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample);
 108 #endif
 109 static FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
 110 static FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data);
 111 static FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data);
 112 static FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data);
 113 static FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data);
 114
 115 /***********************************************************************
 116  *
 117  * Private class data
 118  *
 119  ***********************************************************************/
 120
 121 typedef struct FLAC__StreamDecoderPrivate {
 122         FLAC__bool is_ogg;
 123         FLAC__StreamDecoderReadCallback read_callback;
 124         FLAC__StreamDecoderSeekCallback seek_callback;
 125         FLAC__StreamDecoderTellCallback tell_callback;
 126         FLAC__StreamDecoderLengthCallback length_callback;
 127         FLAC__StreamDecoderEofCallback eof_callback;
 128         FLAC__StreamDecoderWriteCallback write_callback;
 129         FLAC__StreamDecoderMetadataCallback metadata_callback;
 130         FLAC__StreamDecoderErrorCallback error_callback;
 131         /* generic 32-bit datapath: */
 132         void (*local_lpc_restore_signal)(const FLAC__int32 residual[], uint32_t data_len, const FLAC__int32 qlp_coeff[], uint32_t order, int lp_quantization, FLAC__int32 data[]);
 133         /* generic 64-bit datapath: */
 134         void (*local_lpc_restore_signal_64bit)(const FLAC__int32 residual[], uint32_t data_len, const FLAC__int32 qlp_coeff[], uint32_t order, int lp_quantization, FLAC__int32 data[]);
 135         /* for use when the signal is <= 16 bits-per-sample, or <= 15 bits-per-sample on a side channel (which requires 1 extra bit): */
 136         void (*local_lpc_restore_signal_16bit)(const FLAC__int32 residual[], uint32_t data_len, const FLAC__int32 qlp_coeff[], uint32_t order, int lp_quantization, FLAC__int32 data[]);
 137         void *client_data;
 138         FILE *file; /* only used if FLAC__stream_decoder_init_file()/FLAC__stream_decoder_init_file() called, else NULL */
 139         FLAC__BitReader *input;
 140         FLAC__int32 *output[FLAC__MAX_CHANNELS];
 141         FLAC__int32 *residual[FLAC__MAX_CHANNELS]; /* WATCHOUT: these are the aligned pointers; the real pointers that should be free()'d are residual_unaligned[] below */
 142         FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents[FLAC__MAX_CHANNELS];
 143         uint32_t output_capacity, output_channels;
 144         FLAC__uint32 fixed_block_size, next_fixed_block_size;
 145         FLAC__uint64 samples_decoded;
 146         FLAC__bool has_stream_info, has_seek_table;
 147         FLAC__StreamMetadata stream_info;
 148         FLAC__StreamMetadata seek_table;
 149         FLAC__bool metadata_filter[128]; /* MAGIC number 128 == total number of metadata block types == 1 << 7 */
 150         FLAC__byte *metadata_filter_ids;
 151         size_t metadata_filter_ids_count, metadata_filter_ids_capacity; /* units for both are IDs, not bytes */
 152         FLAC__Frame frame;
 153         FLAC__bool cached; /* true if there is a byte in lookahead */
 154         FLAC__CPUInfo cpuinfo;
 155         FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */
 156         FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */
 157         /* unaligned (original) pointers to allocated data */
 158         FLAC__int32 *residual_unaligned[FLAC__MAX_CHANNELS];
 159         FLAC__bool do_md5_checking; /* initially gets protected_->md5_checking but is turned off after a seek or if the metadata has a zero MD5 */
 160         FLAC__bool internal_reset_hack; /* used only during init() so we can call reset to set up the decoder without rewinding the input */
 161         FLAC__bool is_seeking;
 162         FLAC__MD5Context md5context;
 163         FLAC__byte computed_md5sum[16]; /* this is the sum we computed from the decoded data */
 164         /* (the rest of these are only used for seeking) */
 165         FLAC__Frame last_frame; /* holds the info of the last frame we seeked to */
 166         FLAC__uint64 first_frame_offset; /* hint to the seek routine of where in the stream the first audio frame starts */
 167         FLAC__uint64 target_sample;
 168         uint32_t unparseable_frame_count; /* used to tell whether we're decoding a future version of FLAC or just got a bad sync */
 169         FLAC__bool got_a_frame; /* hack needed in Ogg FLAC seek routine to check when process_single() actually writes a frame */
 170 } FLAC__StreamDecoderPrivate;
 171
 172 /***********************************************************************
 173  *
 174  * Public static class data
 175  *
 176  ***********************************************************************/
 177
 178 FLAC_API const char * const FLAC__StreamDecoderStateString[] = {
 179         "FLAC__STREAM_DECODER_SEARCH_FOR_METADATA",
 180         "FLAC__STREAM_DECODER_READ_METADATA",
 181         "FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC",
 182         "FLAC__STREAM_DECODER_READ_FRAME",
 183         "FLAC__STREAM_DECODER_END_OF_STREAM",
 184         "FLAC__STREAM_DECODER_OGG_ERROR",
 185         "FLAC__STREAM_DECODER_SEEK_ERROR",
 186         "FLAC__STREAM_DECODER_ABORTED",
 187         "FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR",
 188         "FLAC__STREAM_DECODER_UNINITIALIZED"
 189 };
 190
 191 FLAC_API const char * const FLAC__StreamDecoderInitStatusString[] = {
 192         "FLAC__STREAM_DECODER_INIT_STATUS_OK",
 193         "FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER",
 194         "FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS",
 195         "FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR",
 196         "FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE",
 197         "FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED"
 198 };
 199
 200 FLAC_API const char * const FLAC__StreamDecoderReadStatusString[] = {
 201         "FLAC__STREAM_DECODER_READ_STATUS_CONTINUE",
 202         "FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM",
 203         "FLAC__STREAM_DECODER_READ_STATUS_ABORT"
 204 };
 205
 206 FLAC_API const char * const FLAC__StreamDecoderSeekStatusString[] = {
 207         "FLAC__STREAM_DECODER_SEEK_STATUS_OK",
 208         "FLAC__STREAM_DECODER_SEEK_STATUS_ERROR",
 209         "FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED"
 210 };
 211
 212 FLAC_API const char * const FLAC__StreamDecoderTellStatusString[] = {
 213         "FLAC__STREAM_DECODER_TELL_STATUS_OK",
 214         "FLAC__STREAM_DECODER_TELL_STATUS_ERROR",
 215         "FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED"
 216 };
 217
 218 FLAC_API const char * const FLAC__StreamDecoderLengthStatusString[] = {
 219         "FLAC__STREAM_DECODER_LENGTH_STATUS_OK",
 220         "FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR",
 221         "FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED"
 222 };
 223
 224 FLAC_API const char * const FLAC__StreamDecoderWriteStatusString[] = {
 225         "FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE",
 226         "FLAC__STREAM_DECODER_WRITE_STATUS_ABORT"
 227 };
 228
 229 FLAC_API const char * const FLAC__StreamDecoderErrorStatusString[] = {
 230         "FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC",
 231         "FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER",
 232         "FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH",
 233         "FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM"
 234 };
 235
 236 /***********************************************************************
 237  *
 238  * Class constructor/destructor
 239  *
 240  ***********************************************************************/
 241 FLAC_API FLAC__StreamDecoder *FLAC__stream_decoder_new(void)
 242 {
 243         FLAC__StreamDecoder *decoder;
 244         uint32_t i;
 245
 246         FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
 247
 248         decoder = calloc(1, sizeof(FLAC__StreamDecoder));
 249         if(decoder == 0) {
 250                 return 0;
 251         }
 252
 253         decoder->protected_ = calloc(1, sizeof(FLAC__StreamDecoderProtected));
 254         if(decoder->protected_ == 0) {
 255                 free(decoder);
 256                 return 0;
 257         }
 258
 259         decoder->private_ = calloc(1, sizeof(FLAC__StreamDecoderPrivate));
 260         if(decoder->private_ == 0) {
 261                 free(decoder->protected_);
 262                 free(decoder);
 263                 return 0;
 264         }
 265
 266         decoder->private_->input = FLAC__bitreader_new();
 267         if(decoder->private_->input == 0) {
 268                 free(decoder->private_);
 269                 free(decoder->protected_);
 270                 free(decoder);
 271                 return 0;
 272         }
 273
 274         decoder->private_->metadata_filter_ids_capacity = 16;
 275         if(0 == (decoder->private_->metadata_filter_ids = malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) {
 276                 FLAC__bitreader_delete(decoder->private_->input);
 277                 free(decoder->private_);
 278                 free(decoder->protected_);
 279                 free(decoder);
 280                 return 0;
 281         }
 282
 283         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 284                 decoder->private_->output[i] = 0;
 285                 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
 286         }
 287
 288         decoder->private_->output_capacity = 0;
 289         decoder->private_->output_channels = 0;
 290         decoder->private_->has_seek_table = false;
 291
 292         for(i = 0; i < FLAC__MAX_CHANNELS; i++)
 293                 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&decoder->private_->partitioned_rice_contents[i]);
 294
 295         decoder->private_->file = 0;
 296
 297         set_defaults_(decoder);
 298
 299         decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
 300
 301         return decoder;
 302 }
 303
 304 FLAC_API void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder)
 305 {
 306         uint32_t i;
 307
 308         if (decoder == NULL)
 309                 return ;
 310
 311         FLAC__ASSERT(0 != decoder->protected_);
 312         FLAC__ASSERT(0 != decoder->private_);
 313         FLAC__ASSERT(0 != decoder->private_->input);
 314
 315         (void)FLAC__stream_decoder_finish(decoder);
 316
 317         if(0 != decoder->private_->metadata_filter_ids)
 318                 free(decoder->private_->metadata_filter_ids);
 319
 320         FLAC__bitreader_delete(decoder->private_->input);
 321
 322         for(i = 0; i < FLAC__MAX_CHANNELS; i++)
 323                 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&decoder->private_->partitioned_rice_contents[i]);
 324
 325         free(decoder->private_);
 326         free(decoder->protected_);
 327         free(decoder);
 328 }
 329
 330 /***********************************************************************
 331  *
 332  * Public class methods
 333  *
 334  ***********************************************************************/
 335
 336 static FLAC__StreamDecoderInitStatus init_stream_internal_(
 337         FLAC__StreamDecoder *decoder,
 338         FLAC__StreamDecoderReadCallback read_callback,
 339         FLAC__StreamDecoderSeekCallback seek_callback,
 340         FLAC__StreamDecoderTellCallback tell_callback,
 341         FLAC__StreamDecoderLengthCallback length_callback,
 342         FLAC__StreamDecoderEofCallback eof_callback,
 343         FLAC__StreamDecoderWriteCallback write_callback,
 344         FLAC__StreamDecoderMetadataCallback metadata_callback,
 345         FLAC__StreamDecoderErrorCallback error_callback,
 346         void *client_data,
 347         FLAC__bool is_ogg
 348 )
 349 {
 350         FLAC__ASSERT(0 != decoder);
 351
 352         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 353                 return FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
 354
 355         if(FLAC__HAS_OGG == 0 && is_ogg)
 356                 return FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER;
 357
 358         if(
 359                 0 == read_callback ||
 360                 0 == write_callback ||
 361                 0 == error_callback ||
 362                 (seek_callback && (0 == tell_callback || 0 == length_callback || 0 == eof_callback))
 363         )
 364                 return FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
 365
 366 #if FLAC__HAS_OGG
 367         decoder->private_->is_ogg = is_ogg;
 368         if(is_ogg && !FLAC__ogg_decoder_aspect_init(&decoder->protected_->ogg_decoder_aspect))
 369                 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE;
 370 #endif
 371
 372         /*
 373          * get the CPU info and set the function pointers
 374          */
 375         FLAC__cpu_info(&decoder->private_->cpuinfo);
 376         /* first default to the non-asm routines */
 377         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal;
 378         decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide;
 379         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal;
 380         /* now override with asm where appropriate */
 381 #ifndef FLAC__NO_ASM
 382         if(decoder->private_->cpuinfo.use_asm) {
 383 #ifdef FLAC__CPU_IA32
 384                 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
 385 #ifdef FLAC__HAS_NASM
 386                 decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide_asm_ia32; /* OPT_IA32: was really necessary for GCC < 4.9 */
 387                 if (decoder->private_->cpuinfo.x86.mmx) {
 388                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
 389                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32_mmx;
 390                 }
 391                 else {
 392                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
 393                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32;
 394                 }
 395 #endif
 396 #if FLAC__HAS_X86INTRIN && ! defined FLAC__INTEGER_ONLY_LIBRARY
 397 # if defined FLAC__SSE4_1_SUPPORTED
 398                 if (decoder->private_->cpuinfo.x86.sse41) {
 399 #  if !defined FLAC__HAS_NASM  /* these are not undoubtedly faster than their MMX ASM counterparts */
 400                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_intrin_sse41;
 401                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_16_intrin_sse41;
 402 #  endif
 403                         decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide_intrin_sse41;
 404                 }
 405 # endif
 406 #endif
 407 #elif defined FLAC__CPU_X86_64
 408                 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_X86_64);
 409                 /* No useful SSE optimizations yet */
 410 #endif
 411         }
 412 #endif
 413
 414         /* from here on, errors are fatal */
 415
 416         if(!FLAC__bitreader_init(decoder->private_->input, read_callback_, decoder)) {
 417                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 418                 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR;
 419         }
 420
 421         decoder->private_->read_callback = read_callback;
 422         decoder->private_->seek_callback = seek_callback;
 423         decoder->private_->tell_callback = tell_callback;
 424         decoder->private_->length_callback = length_callback;
 425         decoder->private_->eof_callback = eof_callback;
 426         decoder->private_->write_callback = write_callback;
 427         decoder->private_->metadata_callback = metadata_callback;
 428         decoder->private_->error_callback = error_callback;
 429         decoder->private_->client_data = client_data;
 430         decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0;
 431         decoder->private_->samples_decoded = 0;
 432         decoder->private_->has_stream_info = false;
 433         decoder->private_->cached = false;
 434
 435         decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
 436         decoder->private_->is_seeking = false;
 437
 438         decoder->private_->internal_reset_hack = true; /* so the following reset does not try to rewind the input */
 439         if(!FLAC__stream_decoder_reset(decoder)) {
 440                 /* above call sets the state for us */
 441                 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR;
 442         }
 443
 444         return FLAC__STREAM_DECODER_INIT_STATUS_OK;
 445 }
 446
 447 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_stream(
 448         FLAC__StreamDecoder *decoder,
 449         FLAC__StreamDecoderReadCallback read_callback,
 450         FLAC__StreamDecoderSeekCallback seek_callback,
 451         FLAC__StreamDecoderTellCallback tell_callback,
 452         FLAC__StreamDecoderLengthCallback length_callback,
 453         FLAC__StreamDecoderEofCallback eof_callback,
 454         FLAC__StreamDecoderWriteCallback write_callback,
 455         FLAC__StreamDecoderMetadataCallback metadata_callback,
 456         FLAC__StreamDecoderErrorCallback error_callback,
 457         void *client_data
 458 )
 459 {
 460         return init_stream_internal_(
 461                 decoder,
 462                 read_callback,
 463                 seek_callback,
 464                 tell_callback,
 465                 length_callback,
 466                 eof_callback,
 467                 write_callback,
 468                 metadata_callback,
 469                 error_callback,
 470                 client_data,
 471                 /*is_ogg=*/false
 472         );
 473 }
 474
 475 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_stream(
 476         FLAC__StreamDecoder *decoder,
 477         FLAC__StreamDecoderReadCallback read_callback,
 478         FLAC__StreamDecoderSeekCallback seek_callback,
 479         FLAC__StreamDecoderTellCallback tell_callback,
 480         FLAC__StreamDecoderLengthCallback length_callback,
 481         FLAC__StreamDecoderEofCallback eof_callback,
 482         FLAC__StreamDecoderWriteCallback write_callback,
 483         FLAC__StreamDecoderMetadataCallback metadata_callback,
 484         FLAC__StreamDecoderErrorCallback error_callback,
 485         void *client_data
 486 )
 487 {
 488         return init_stream_internal_(
 489                 decoder,
 490                 read_callback,
 491                 seek_callback,
 492                 tell_callback,
 493                 length_callback,
 494                 eof_callback,
 495                 write_callback,
 496                 metadata_callback,
 497                 error_callback,
 498                 client_data,
 499                 /*is_ogg=*/true
 500         );
 501 }
 502
 503 static FLAC__StreamDecoderInitStatus init_FILE_internal_(
 504         FLAC__StreamDecoder *decoder,
 505         FILE *file,
 506         FLAC__StreamDecoderWriteCallback write_callback,
 507         FLAC__StreamDecoderMetadataCallback metadata_callback,
 508         FLAC__StreamDecoderErrorCallback error_callback,
 509         void *client_data,
 510         FLAC__bool is_ogg
 511 )
 512 {
 513         FLAC__ASSERT(0 != decoder);
 514         FLAC__ASSERT(0 != file);
 515
 516         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 517                 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
 518
 519         if(0 == write_callback || 0 == error_callback)
 520                 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
 521
 522         /*
 523          * To make sure that our file does not go unclosed after an error, we
 524          * must assign the FILE pointer before any further error can occur in
 525          * this routine.
 526          */
 527         if(file == stdin)
 528                 file = get_binary_stdin_(); /* just to be safe */
 529
 530         decoder->private_->file = file;
 531
 532         return init_stream_internal_(
 533                 decoder,
 534                 file_read_callback_,
 535                 decoder->private_->file == stdin? 0: file_seek_callback_,
 536                 decoder->private_->file == stdin? 0: file_tell_callback_,
 537                 decoder->private_->file == stdin? 0: file_length_callback_,
 538                 file_eof_callback_,
 539                 write_callback,
 540                 metadata_callback,
 541                 error_callback,
 542                 client_data,
 543                 is_ogg
 544         );
 545 }
 546
 547 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_FILE(
 548         FLAC__StreamDecoder *decoder,
 549         FILE *file,
 550         FLAC__StreamDecoderWriteCallback write_callback,
 551         FLAC__StreamDecoderMetadataCallback metadata_callback,
 552         FLAC__StreamDecoderErrorCallback error_callback,
 553         void *client_data
 554 )
 555 {
 556         return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false);
 557 }
 558
 559 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_FILE(
 560         FLAC__StreamDecoder *decoder,
 561         FILE *file,
 562         FLAC__StreamDecoderWriteCallback write_callback,
 563         FLAC__StreamDecoderMetadataCallback metadata_callback,
 564         FLAC__StreamDecoderErrorCallback error_callback,
 565         void *client_data
 566 )
 567 {
 568         return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true);
 569 }
 570
 571 static FLAC__StreamDecoderInitStatus init_file_internal_(
 572         FLAC__StreamDecoder *decoder,
 573         const char *filename,
 574         FLAC__StreamDecoderWriteCallback write_callback,
 575         FLAC__StreamDecoderMetadataCallback metadata_callback,
 576         FLAC__StreamDecoderErrorCallback error_callback,
 577         void *client_data,
 578         FLAC__bool is_ogg
 579 )
 580 {
 581         FILE *file;
 582
 583         FLAC__ASSERT(0 != decoder);
 584
 585         /*
 586          * To make sure that our file does not go unclosed after an error, we
 587          * have to do the same entrance checks here that are later performed
 588          * in FLAC__stream_decoder_init_FILE() before the FILE* is assigned.
 589          */
 590         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 591                 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
 592
 593         if(0 == write_callback || 0 == error_callback)
 594                 return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
 595
 596         file = filename? flac_fopen(filename, "rb") : stdin;
 597
 598         if(0 == file)
 599                 return FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE;
 600
 601         return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, is_ogg);
 602 }
 603
 604 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_file(
 605         FLAC__StreamDecoder *decoder,
 606         const char *filename,
 607         FLAC__StreamDecoderWriteCallback write_callback,
 608         FLAC__StreamDecoderMetadataCallback metadata_callback,
 609         FLAC__StreamDecoderErrorCallback error_callback,
 610         void *client_data
 611 )
 612 {
 613         return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false);
 614 }
 615
 616 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_file(
 617         FLAC__StreamDecoder *decoder,
 618         const char *filename,
 619         FLAC__StreamDecoderWriteCallback write_callback,
 620         FLAC__StreamDecoderMetadataCallback metadata_callback,
 621         FLAC__StreamDecoderErrorCallback error_callback,
 622         void *client_data
 623 )
 624 {
 625         return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true);
 626 }
 627
 628 FLAC_API FLAC__bool FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder)
 629 {
 630         FLAC__bool md5_failed = false;
 631         uint32_t i;
 632
 633         FLAC__ASSERT(0 != decoder);
 634         FLAC__ASSERT(0 != decoder->private_);
 635         FLAC__ASSERT(0 != decoder->protected_);
 636
 637         if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
 638                 return true;
 639
 640         /* see the comment in FLAC__stream_decoder_reset() as to why we
 641          * always call FLAC__MD5Final()
 642          */
 643         FLAC__MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context);
 644
 645         free(decoder->private_->seek_table.data.seek_table.points);
 646         decoder->private_->seek_table.data.seek_table.points = 0;
 647         decoder->private_->has_seek_table = false;
 648
 649         FLAC__bitreader_free(decoder->private_->input);
 650         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 651                 /* WATCHOUT:
 652                  * FLAC__lpc_restore_signal_asm_ia32_mmx() and ..._intrin_sseN()
 653                  * require that the output arrays have a buffer of up to 3 zeroes
 654                  * in front (at negative indices) for alignment purposes;
 655                  * we use 4 to keep the data well-aligned.
 656                  */
 657                 if(0 != decoder->private_->output[i]) {
 658                         free(decoder->private_->output[i]-4);
 659                         decoder->private_->output[i] = 0;
 660                 }
 661                 if(0 != decoder->private_->residual_unaligned[i]) {
 662                         free(decoder->private_->residual_unaligned[i]);
 663                         decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
 664                 }
 665         }
 666         decoder->private_->output_capacity = 0;
 667         decoder->private_->output_channels = 0;
 668
 669 #if FLAC__HAS_OGG
 670         if(decoder->private_->is_ogg)
 671                 FLAC__ogg_decoder_aspect_finish(&decoder->protected_->ogg_decoder_aspect);
 672 #endif
 673
 674         if(0 != decoder->private_->file) {
 675                 if(decoder->private_->file != stdin)
 676                         fclose(decoder->private_->file);
 677                 decoder->private_->file = 0;
 678         }
 679
 680         if(decoder->private_->do_md5_checking) {
 681                 if(memcmp(decoder->private_->stream_info.data.stream_info.md5sum, decoder->private_->computed_md5sum, 16))
 682                         md5_failed = true;
 683         }
 684         decoder->private_->is_seeking = false;
 685
 686         set_defaults_(decoder);
 687
 688         decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
 689
 690         return !md5_failed;
 691 }
 692
 693 FLAC_API FLAC__bool FLAC__stream_decoder_set_ogg_serial_number(FLAC__StreamDecoder *decoder, long value)
 694 {
 695         FLAC__ASSERT(0 != decoder);
 696         FLAC__ASSERT(0 != decoder->private_);
 697         FLAC__ASSERT(0 != decoder->protected_);
 698         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 699                 return false;
 700 #if FLAC__HAS_OGG
 701         /* can't check decoder->private_->is_ogg since that's not set until init time */
 702         FLAC__ogg_decoder_aspect_set_serial_number(&decoder->protected_->ogg_decoder_aspect, value);
 703         return true;
 704 #else
 705         (void)value;
 706         return false;
 707 #endif
 708 }
 709
 710 FLAC_API FLAC__bool FLAC__stream_decoder_set_md5_checking(FLAC__StreamDecoder *decoder, FLAC__bool value)
 711 {
 712         FLAC__ASSERT(0 != decoder);
 713         FLAC__ASSERT(0 != decoder->protected_);
 714         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 715                 return false;
 716         decoder->protected_->md5_checking = value;
 717         return true;
 718 }
 719
 720 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
 721 {
 722         FLAC__ASSERT(0 != decoder);
 723         FLAC__ASSERT(0 != decoder->private_);
 724         FLAC__ASSERT(0 != decoder->protected_);
 725         FLAC__ASSERT((uint32_t)type <= FLAC__MAX_METADATA_TYPE_CODE);
 726         /* double protection */
 727         if((uint32_t)type > FLAC__MAX_METADATA_TYPE_CODE)
 728                 return false;
 729         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 730                 return false;
 731         decoder->private_->metadata_filter[type] = true;
 732         if(type == FLAC__METADATA_TYPE_APPLICATION)
 733                 decoder->private_->metadata_filter_ids_count = 0;
 734         return true;
 735 }
 736
 737 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
 738 {
 739         FLAC__ASSERT(0 != decoder);
 740         FLAC__ASSERT(0 != decoder->private_);
 741         FLAC__ASSERT(0 != decoder->protected_);
 742         FLAC__ASSERT(0 != id);
 743         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 744                 return false;
 745
 746         if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
 747                 return true;
 748
 749         FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
 750
 751         if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
 752                 if(0 == (decoder->private_->metadata_filter_ids = safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) {
 753                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 754                         return false;
 755                 }
 756                 decoder->private_->metadata_filter_ids_capacity *= 2;
 757         }
 758
 759         memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
 760         decoder->private_->metadata_filter_ids_count++;
 761
 762         return true;
 763 }
 764
 765 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder)
 766 {
 767         uint32_t i;
 768         FLAC__ASSERT(0 != decoder);
 769         FLAC__ASSERT(0 != decoder->private_);
 770         FLAC__ASSERT(0 != decoder->protected_);
 771         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 772                 return false;
 773         for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++)
 774                 decoder->private_->metadata_filter[i] = true;
 775         decoder->private_->metadata_filter_ids_count = 0;
 776         return true;
 777 }
 778
 779 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
 780 {
 781         FLAC__ASSERT(0 != decoder);
 782         FLAC__ASSERT(0 != decoder->private_);
 783         FLAC__ASSERT(0 != decoder->protected_);
 784         FLAC__ASSERT((uint32_t)type <= FLAC__MAX_METADATA_TYPE_CODE);
 785         /* double protection */
 786         if((uint32_t)type > FLAC__MAX_METADATA_TYPE_CODE)
 787                 return false;
 788         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 789                 return false;
 790         decoder->private_->metadata_filter[type] = false;
 791         if(type == FLAC__METADATA_TYPE_APPLICATION)
 792                 decoder->private_->metadata_filter_ids_count = 0;
 793         return true;
 794 }
 795
 796 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
 797 {
 798         FLAC__ASSERT(0 != decoder);
 799         FLAC__ASSERT(0 != decoder->private_);
 800         FLAC__ASSERT(0 != decoder->protected_);
 801         FLAC__ASSERT(0 != id);
 802         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 803                 return false;
 804
 805         if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
 806                 return true;
 807
 808         FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
 809
 810         if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
 811                 if(0 == (decoder->private_->metadata_filter_ids = safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) {
 812                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 813                         return false;
 814                 }
 815                 decoder->private_->metadata_filter_ids_capacity *= 2;
 816         }
 817
 818         memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
 819         decoder->private_->metadata_filter_ids_count++;
 820
 821         return true;
 822 }
 823
 824 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder)
 825 {
 826         FLAC__ASSERT(0 != decoder);
 827         FLAC__ASSERT(0 != decoder->private_);
 828         FLAC__ASSERT(0 != decoder->protected_);
 829         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 830                 return false;
 831         memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
 832         decoder->private_->metadata_filter_ids_count = 0;
 833         return true;
 834 }
 835
 836 FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder)
 837 {
 838         FLAC__ASSERT(0 != decoder);
 839         FLAC__ASSERT(0 != decoder->protected_);
 840         return decoder->protected_->state;
 841 }
 842
 843 FLAC_API const char *FLAC__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder *decoder)
 844 {
 845         return FLAC__StreamDecoderStateString[decoder->protected_->state];
 846 }
 847
 848 FLAC_API FLAC__bool FLAC__stream_decoder_get_md5_checking(const FLAC__StreamDecoder *decoder)
 849 {
 850         FLAC__ASSERT(0 != decoder);
 851         FLAC__ASSERT(0 != decoder->protected_);
 852         return decoder->protected_->md5_checking;
 853 }
 854
 855 FLAC_API FLAC__uint64 FLAC__stream_decoder_get_total_samples(const FLAC__StreamDecoder *decoder)
 856 {
 857         FLAC__ASSERT(0 != decoder);
 858         FLAC__ASSERT(0 != decoder->protected_);
 859         return decoder->private_->has_stream_info? decoder->private_->stream_info.data.stream_info.total_samples : 0;
 860 }
 861
 862 FLAC_API uint32_t FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder)
 863 {
 864         FLAC__ASSERT(0 != decoder);
 865         FLAC__ASSERT(0 != decoder->protected_);
 866         return decoder->protected_->channels;
 867 }
 868
 869 FLAC_API FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder)
 870 {
 871         FLAC__ASSERT(0 != decoder);
 872         FLAC__ASSERT(0 != decoder->protected_);
 873         return decoder->protected_->channel_assignment;
 874 }
 875
 876 FLAC_API uint32_t FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder)
 877 {
 878         FLAC__ASSERT(0 != decoder);
 879         FLAC__ASSERT(0 != decoder->protected_);
 880         return decoder->protected_->bits_per_sample;
 881 }
 882
 883 FLAC_API uint32_t FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder)
 884 {
 885         FLAC__ASSERT(0 != decoder);
 886         FLAC__ASSERT(0 != decoder->protected_);
 887         return decoder->protected_->sample_rate;
 888 }
 889
 890 FLAC_API uint32_t FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder)
 891 {
 892         FLAC__ASSERT(0 != decoder);
 893         FLAC__ASSERT(0 != decoder->protected_);
 894         return decoder->protected_->blocksize;
 895 }
 896
 897 FLAC_API FLAC__bool FLAC__stream_decoder_get_decode_position(const FLAC__StreamDecoder *decoder, FLAC__uint64 *position)
 898 {
 899         FLAC__ASSERT(0 != decoder);
 900         FLAC__ASSERT(0 != decoder->private_);
 901         FLAC__ASSERT(0 != position);
 902
 903         if(FLAC__HAS_OGG && decoder->private_->is_ogg)
 904                 return false;
 905
 906         if(0 == decoder->private_->tell_callback)
 907                 return false;
 908         if(decoder->private_->tell_callback(decoder, position, decoder->private_->client_data) != FLAC__STREAM_DECODER_TELL_STATUS_OK)
 909                 return false;
 910         /* should never happen since all FLAC frames and metadata blocks are byte aligned, but check just in case */
 911         if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input))
 912                 return false;
 913         FLAC__ASSERT(*position >= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder));
 914         *position -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder);
 915         return true;
 916 }
 917
 918 FLAC_API FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
 919 {
 920         FLAC__ASSERT(0 != decoder);
 921         FLAC__ASSERT(0 != decoder->private_);
 922         FLAC__ASSERT(0 != decoder->protected_);
 923
 924         if(!decoder->private_->internal_reset_hack && decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
 925                 return false;
 926
 927         decoder->private_->samples_decoded = 0;
 928         decoder->private_->do_md5_checking = false;
 929
 930 #if FLAC__HAS_OGG
 931         if(decoder->private_->is_ogg)
 932                 FLAC__ogg_decoder_aspect_flush(&decoder->protected_->ogg_decoder_aspect);
 933 #endif
 934
 935         if(!FLAC__bitreader_clear(decoder->private_->input)) {
 936                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 937                 return false;
 938         }
 939         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 940
 941         return true;
 942 }
 943
 944 FLAC_API FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
 945 {
 946         FLAC__ASSERT(0 != decoder);
 947         FLAC__ASSERT(0 != decoder->private_);
 948         FLAC__ASSERT(0 != decoder->protected_);
 949
 950         if(!FLAC__stream_decoder_flush(decoder)) {
 951                 /* above call sets the state for us */
 952                 return false;
 953         }
 954
 955 #if FLAC__HAS_OGG
 956         /*@@@ could go in !internal_reset_hack block below */
 957         if(decoder->private_->is_ogg)
 958                 FLAC__ogg_decoder_aspect_reset(&decoder->protected_->ogg_decoder_aspect);
 959 #endif
 960
 961         /* Rewind if necessary.  If FLAC__stream_decoder_init() is calling us,
 962          * (internal_reset_hack) don't try to rewind since we are already at
 963          * the beginning of the stream and don't want to fail if the input is
 964          * not seekable.
 965          */
 966         if(!decoder->private_->internal_reset_hack) {
 967                 if(decoder->private_->file == stdin)
 968                         return false; /* can't rewind stdin, reset fails */
 969                 if(decoder->private_->seek_callback && decoder->private_->seek_callback(decoder, 0, decoder->private_->client_data) == FLAC__STREAM_DECODER_SEEK_STATUS_ERROR)
 970                         return false; /* seekable and seek fails, reset fails */
 971         }
 972         else
 973                 decoder->private_->internal_reset_hack = false;
 974
 975         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
 976
 977         decoder->private_->has_stream_info = false;
 978
 979         free(decoder->private_->seek_table.data.seek_table.points);
 980         decoder->private_->seek_table.data.seek_table.points = 0;
 981         decoder->private_->has_seek_table = false;
 982
 983         decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
 984         /*
 985          * This goes in reset() and not flush() because according to the spec, a
 986          * fixed-blocksize stream must stay that way through the whole stream.
 987          */
 988         decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0;
 989
 990         /* We initialize the FLAC__MD5Context even though we may never use it.  This
 991          * is because md5 checking may be turned on to start and then turned off if
 992          * a seek occurs.  So we init the context here and finalize it in
 993          * FLAC__stream_decoder_finish() to make sure things are always cleaned up
 994          * properly.
 995          */
 996         FLAC__MD5Init(&decoder->private_->md5context);
 997
 998         decoder->private_->first_frame_offset = 0;
 999         decoder->private_->unparseable_frame_count = 0;
1000
1001         return true;
1002 }
1003
1004 FLAC_API FLAC__bool FLAC__stream_decoder_process_single(FLAC__StreamDecoder *decoder)
1005 {
1006         FLAC__bool got_a_frame;
1007         FLAC__ASSERT(0 != decoder);
1008         FLAC__ASSERT(0 != decoder->protected_);
1009
1010         while(1) {
1011                 switch(decoder->protected_->state) {
1012                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1013                                 if(!find_metadata_(decoder))
1014                                         return false; /* above function sets the status for us */
1015                                 break;
1016                         case FLAC__STREAM_DECODER_READ_METADATA:
1017                                 if(!read_metadata_(decoder))
1018                                         return false; /* above function sets the status for us */
1019                                 else
1020                                         return true;
1021                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1022                                 if(!frame_sync_(decoder))
1023                                         return true; /* above function sets the status for us */
1024                                 break;
1025                         case FLAC__STREAM_DECODER_READ_FRAME:
1026                                 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/true))
1027                                         return false; /* above function sets the status for us */
1028                                 if(got_a_frame)
1029                                         return true; /* above function sets the status for us */
1030                                 break;
1031                         case FLAC__STREAM_DECODER_END_OF_STREAM:
1032                         case FLAC__STREAM_DECODER_ABORTED:
1033                                 return true;
1034                         default:
1035                                 FLAC__ASSERT(0);
1036                                 return false;
1037                 }
1038         }
1039 }
1040
1041 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder *decoder)
1042 {
1043         FLAC__ASSERT(0 != decoder);
1044         FLAC__ASSERT(0 != decoder->protected_);
1045
1046         while(1) {
1047                 switch(decoder->protected_->state) {
1048                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1049                                 if(!find_metadata_(decoder))
1050                                         return false; /* above function sets the status for us */
1051                                 break;
1052                         case FLAC__STREAM_DECODER_READ_METADATA:
1053                                 if(!read_metadata_(decoder))
1054                                         return false; /* above function sets the status for us */
1055                                 break;
1056                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1057                         case FLAC__STREAM_DECODER_READ_FRAME:
1058                         case FLAC__STREAM_DECODER_END_OF_STREAM:
1059                         case FLAC__STREAM_DECODER_ABORTED:
1060                                 return true;
1061                         default:
1062                                 FLAC__ASSERT(0);
1063                                 return false;
1064                 }
1065         }
1066 }
1067
1068 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder *decoder)
1069 {
1070         FLAC__bool dummy;
1071         FLAC__ASSERT(0 != decoder);
1072         FLAC__ASSERT(0 != decoder->protected_);
1073
1074         while(1) {
1075                 switch(decoder->protected_->state) {
1076                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1077                                 if(!find_metadata_(decoder))
1078                                         return false; /* above function sets the status for us */
1079                                 break;
1080                         case FLAC__STREAM_DECODER_READ_METADATA:
1081                                 if(!read_metadata_(decoder))
1082                                         return false; /* above function sets the status for us */
1083                                 break;
1084                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1085                                 if(!frame_sync_(decoder))
1086                                         return true; /* above function sets the status for us */
1087                                 break;
1088                         case FLAC__STREAM_DECODER_READ_FRAME:
1089                                 if(!read_frame_(decoder, &dummy, /*do_full_decode=*/true))
1090                                         return false; /* above function sets the status for us */
1091                                 break;
1092                         case FLAC__STREAM_DECODER_END_OF_STREAM:
1093                         case FLAC__STREAM_DECODER_ABORTED:
1094                                 return true;
1095                         default:
1096                                 FLAC__ASSERT(0);
1097                                 return false;
1098                 }
1099         }
1100 }
1101
1102 FLAC_API FLAC__bool FLAC__stream_decoder_skip_single_frame(FLAC__StreamDecoder *decoder)
1103 {
1104         FLAC__bool got_a_frame;
1105         FLAC__ASSERT(0 != decoder);
1106         FLAC__ASSERT(0 != decoder->protected_);
1107
1108         while(1) {
1109                 switch(decoder->protected_->state) {
1110                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1111                         case FLAC__STREAM_DECODER_READ_METADATA:
1112                                 return false; /* above function sets the status for us */
1113                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1114                                 if(!frame_sync_(decoder))
1115                                         return true; /* above function sets the status for us */
1116                                 break;
1117                         case FLAC__STREAM_DECODER_READ_FRAME:
1118                                 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/false))
1119                                         return false; /* above function sets the status for us */
1120                                 if(got_a_frame)
1121                                         return true; /* above function sets the status for us */
1122                                 break;
1123                         case FLAC__STREAM_DECODER_END_OF_STREAM:
1124                         case FLAC__STREAM_DECODER_ABORTED:
1125                                 return true;
1126                         default:
1127                                 FLAC__ASSERT(0);
1128                                 return false;
1129                 }
1130         }
1131 }
1132
1133 FLAC_API FLAC__bool FLAC__stream_decoder_seek_absolute(FLAC__StreamDecoder *decoder, FLAC__uint64 sample)
1134 {
1135         FLAC__uint64 length;
1136
1137         FLAC__ASSERT(0 != decoder);
1138
1139         if(
1140                 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA &&
1141                 decoder->protected_->state != FLAC__STREAM_DECODER_READ_METADATA &&
1142                 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC &&
1143                 decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME &&
1144                 decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM
1145         )
1146                 return false;
1147
1148         if(0 == decoder->private_->seek_callback)
1149                 return false;
1150
1151         FLAC__ASSERT(decoder->private_->seek_callback);
1152         FLAC__ASSERT(decoder->private_->tell_callback);
1153         FLAC__ASSERT(decoder->private_->length_callback);
1154         FLAC__ASSERT(decoder->private_->eof_callback);
1155
1156         if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder))
1157                 return false;
1158
1159         decoder->private_->is_seeking = true;
1160
1161         /* turn off md5 checking if a seek is attempted */
1162         decoder->private_->do_md5_checking = false;
1163
1164         /* get the file length (currently our algorithm needs to know the length so it's also an error to get FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED) */
1165         if(decoder->private_->length_callback(decoder, &length, decoder->private_->client_data) != FLAC__STREAM_DECODER_LENGTH_STATUS_OK) {
1166                 decoder->private_->is_seeking = false;
1167                 return false;
1168         }
1169
1170         /* if we haven't finished processing the metadata yet, do that so we have the STREAMINFO, SEEK_TABLE, and first_frame_offset */
1171         if(
1172                 decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA ||
1173                 decoder->protected_->state == FLAC__STREAM_DECODER_READ_METADATA
1174         ) {
1175                 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder)) {
1176                         /* above call sets the state for us */
1177                         decoder->private_->is_seeking = false;
1178                         return false;
1179                 }
1180                 /* check this again in case we didn't know total_samples the first time */
1181                 if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder)) {
1182                         decoder->private_->is_seeking = false;
1183                         return false;
1184                 }
1185         }
1186
1187         {
1188                 const FLAC__bool ok =
1189 #if FLAC__HAS_OGG
1190                         decoder->private_->is_ogg?
1191                         seek_to_absolute_sample_ogg_(decoder, length, sample) :
1192 #endif
1193                         seek_to_absolute_sample_(decoder, length, sample)
1194                 ;
1195                 decoder->private_->is_seeking = false;
1196                 return ok;
1197         }
1198 }
1199
1200 /***********************************************************************
1201  *
1202  * Protected class methods
1203  *
1204  ***********************************************************************/
1205
1206 uint32_t FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder)
1207 {
1208         FLAC__ASSERT(0 != decoder);
1209         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1210         FLAC__ASSERT(!(FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) & 7));
1211         return FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) / 8;
1212 }
1213
1214 /***********************************************************************
1215  *
1216  * Private class methods
1217  *
1218  ***********************************************************************/
1219
1220 void set_defaults_(FLAC__StreamDecoder *decoder)
1221 {
1222         decoder->private_->is_ogg = false;
1223         decoder->private_->read_callback = 0;
1224         decoder->private_->seek_callback = 0;
1225         decoder->private_->tell_callback = 0;
1226         decoder->private_->length_callback = 0;
1227         decoder->private_->eof_callback = 0;
1228         decoder->private_->write_callback = 0;
1229         decoder->private_->metadata_callback = 0;
1230         decoder->private_->error_callback = 0;
1231         decoder->private_->client_data = 0;
1232
1233         memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
1234         decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true;
1235         decoder->private_->metadata_filter_ids_count = 0;
1236
1237         decoder->protected_->md5_checking = false;
1238
1239 #if FLAC__HAS_OGG
1240         FLAC__ogg_decoder_aspect_set_defaults(&decoder->protected_->ogg_decoder_aspect);
1241 #endif
1242 }
1243
1244 /*
1245  * This will forcibly set stdin to binary mode (for OSes that require it)
1246  */
1247 FILE *get_binary_stdin_(void)
1248 {
1249         /* if something breaks here it is probably due to the presence or
1250          * absence of an underscore before the identifiers 'setmode',
1251          * 'fileno', and/or 'O_BINARY'; check your system header files.
1252          */
1253 #if defined _MSC_VER || defined __MINGW32__
1254         _setmode(_fileno(stdin), _O_BINARY);
1255 #elif defined __EMX__
1256         setmode(fileno(stdin), O_BINARY);
1257 #endif
1258
1259         return stdin;
1260 }
1261
1262 FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, uint32_t size, uint32_t channels)
1263 {
1264         uint32_t i;
1265         FLAC__int32 *tmp;
1266
1267         if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels)
1268                 return true;
1269
1270         /* simply using realloc() is not practical because the number of channels may change mid-stream */
1271
1272         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
1273                 if(0 != decoder->private_->output[i]) {
1274                         free(decoder->private_->output[i]-4);
1275                         decoder->private_->output[i] = 0;
1276                 }
1277                 if(0 != decoder->private_->residual_unaligned[i]) {
1278                         free(decoder->private_->residual_unaligned[i]);
1279                         decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
1280                 }
1281         }
1282
1283         for(i = 0; i < channels; i++) {
1284                 /* WATCHOUT:
1285                  * FLAC__lpc_restore_signal_asm_ia32_mmx() and ..._intrin_sseN()
1286                  * require that the output arrays have a buffer of up to 3 zeroes
1287                  * in front (at negative indices) for alignment purposes;
1288                  * we use 4 to keep the data well-aligned.
1289                  */
1290                 tmp = safe_malloc_muladd2_(sizeof(FLAC__int32), /*times (*/size, /*+*/4/*)*/);
1291                 if(tmp == 0) {
1292                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1293                         return false;
1294                 }
1295                 memset(tmp, 0, sizeof(FLAC__int32)*4);
1296                 decoder->private_->output[i] = tmp + 4;
1297
1298                 if(!FLAC__memory_alloc_aligned_int32_array(size, &decoder->private_->residual_unaligned[i], &decoder->private_->residual[i])) {
1299                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1300                         return false;
1301                 }
1302         }
1303
1304         decoder->private_->output_capacity = size;
1305         decoder->private_->output_channels = channels;
1306
1307         return true;
1308 }
1309
1310 FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id)
1311 {
1312         size_t i;
1313
1314         FLAC__ASSERT(0 != decoder);
1315         FLAC__ASSERT(0 != decoder->private_);
1316
1317         for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++)
1318                 if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)))
1319                         return true;
1320
1321         return false;
1322 }
1323
1324 FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder)
1325 {
1326         FLAC__uint32 x;
1327         uint32_t i, id;
1328         FLAC__bool first = true;
1329
1330         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1331
1332         for(i = id = 0; i < 4; ) {
1333                 if(decoder->private_->cached) {
1334                         x = (FLAC__uint32)decoder->private_->lookahead;
1335                         decoder->private_->cached = false;
1336                 }
1337                 else {
1338                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1339                                 return false; /* read_callback_ sets the state for us */
1340                 }
1341                 if(x == FLAC__STREAM_SYNC_STRING[i]) {
1342                         first = true;
1343                         i++;
1344                         id = 0;
1345                         continue;
1346                 }
1347
1348                 if(id >= 3)
1349                         return false;
1350
1351                 if(x == ID3V2_TAG_[id]) {
1352                         id++;
1353                         i = 0;
1354                         if(id == 3) {
1355                                 if(!skip_id3v2_tag_(decoder))
1356                                         return false; /* skip_id3v2_tag_ sets the state for us */
1357                         }
1358                         continue;
1359                 }
1360                 id = 0;
1361                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1362                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
1363                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1364                                 return false; /* read_callback_ sets the state for us */
1365
1366                         /* we have to check if we just read two 0xff's in a row; the second may actually be the beginning of the sync code */
1367                         /* else we have to check if the second byte is the end of a sync code */
1368                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1369                                 decoder->private_->lookahead = (FLAC__byte)x;
1370                                 decoder->private_->cached = true;
1371                         }
1372                         else if(x >> 1 == 0x7c) { /* MAGIC NUMBER for the last 6 sync bits and reserved 7th bit */
1373                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
1374                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
1375                                 return true;
1376                         }
1377                 }
1378                 i = 0;
1379                 if(first) {
1380                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
1381                         first = false;
1382                 }
1383         }
1384
1385         decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA;
1386         return true;
1387 }
1388
1389 FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder)
1390 {
1391         FLAC__bool is_last;
1392         FLAC__uint32 i, x, type, length;
1393
1394         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1395
1396         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_IS_LAST_LEN))
1397                 return false; /* read_callback_ sets the state for us */
1398         is_last = x? true : false;
1399
1400         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN))
1401                 return false; /* read_callback_ sets the state for us */
1402
1403         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN))
1404                 return false; /* read_callback_ sets the state for us */
1405
1406         if(type == FLAC__METADATA_TYPE_STREAMINFO) {
1407                 if(!read_metadata_streaminfo_(decoder, is_last, length))
1408                         return false;
1409
1410                 decoder->private_->has_stream_info = true;
1411                 if(0 == memcmp(decoder->private_->stream_info.data.stream_info.md5sum, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 16))
1412                         decoder->private_->do_md5_checking = false;
1413                 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] && decoder->private_->metadata_callback)
1414                         decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data);
1415         }
1416         else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
1417                 /* just in case we already have a seek table, and reading the next one fails: */
1418                 decoder->private_->has_seek_table = false;
1419
1420                 if(!read_metadata_seektable_(decoder, is_last, length))
1421                         return false;
1422
1423                 decoder->private_->has_seek_table = true;
1424                 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE] && decoder->private_->metadata_callback)
1425                         decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data);
1426         }
1427         else {
1428                 FLAC__bool skip_it = !decoder->private_->metadata_filter[type];
1429                 uint32_t real_length = length;
1430                 FLAC__StreamMetadata block;
1431
1432                 memset(&block, 0, sizeof(block));
1433                 block.is_last = is_last;
1434                 block.type = (FLAC__MetadataType)type;
1435                 block.length = length;
1436
1437                 if(type == FLAC__METADATA_TYPE_APPLICATION) {
1438                         if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8))
1439                                 return false; /* read_callback_ sets the state for us */
1440
1441                         if(real_length < FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) { /* underflow check */
1442                                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;/*@@@@@@ maybe wrong error? need to resync?*/
1443                                 return false;
1444                         }
1445
1446                         real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8;
1447
1448                         if(decoder->private_->metadata_filter_ids_count > 0 && has_id_filtered_(decoder, block.data.application.id))
1449                                 skip_it = !skip_it;
1450                 }
1451
1452                 if(skip_it) {
1453                         if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length))
1454                                 return false; /* read_callback_ sets the state for us */
1455                 }
1456                 else {
1457                         FLAC__bool ok = true;
1458                         switch(type) {
1459                                 case FLAC__METADATA_TYPE_PADDING:
1460                                         /* skip the padding bytes */
1461                                         if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length))
1462                                                 ok = false; /* read_callback_ sets the state for us */
1463                                         break;
1464                                 case FLAC__METADATA_TYPE_APPLICATION:
1465                                         /* remember, we read the ID already */
1466                                         if(real_length > 0) {
1467                                                 if(0 == (block.data.application.data = malloc(real_length))) {
1468                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1469                                                         ok = false;
1470                                                 }
1471                                                 else if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.data, real_length))
1472                                                         ok = false; /* read_callback_ sets the state for us */
1473                                         }
1474                                         else
1475                                                 block.data.application.data = 0;
1476                                         break;
1477                                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1478                                         if(!read_metadata_vorbiscomment_(decoder, &block.data.vorbis_comment, real_length))
1479                                                 ok = false;
1480                                         break;
1481                                 case FLAC__METADATA_TYPE_CUESHEET:
1482                                         if(!read_metadata_cuesheet_(decoder, &block.data.cue_sheet))
1483                                                 ok = false;
1484                                         break;
1485                                 case FLAC__METADATA_TYPE_PICTURE:
1486                                         if(!read_metadata_picture_(decoder, &block.data.picture))
1487                                                 ok = false;
1488                                         break;
1489                                 case FLAC__METADATA_TYPE_STREAMINFO:
1490                                 case FLAC__METADATA_TYPE_SEEKTABLE:
1491                                         FLAC__ASSERT(0);
1492                                         break;
1493                                 default:
1494                                         if(real_length > 0) {
1495                                                 if(0 == (block.data.unknown.data = malloc(real_length))) {
1496                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1497                                                         ok = false;
1498                                                 }
1499                                                 else if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.unknown.data, real_length))
1500                                                         ok = false; /* read_callback_ sets the state for us */
1501                                         }
1502                                         else
1503                                                 block.data.unknown.data = 0;
1504                                         break;
1505                         }
1506                         if(ok && !decoder->private_->is_seeking && decoder->private_->metadata_callback)
1507                                 decoder->private_->metadata_callback(decoder, &block, decoder->private_->client_data);
1508
1509                         /* now we have to free any malloc()ed data in the block */
1510                         switch(type) {
1511                                 case FLAC__METADATA_TYPE_PADDING:
1512                                         break;
1513                                 case FLAC__METADATA_TYPE_APPLICATION:
1514                                         if(0 != block.data.application.data)
1515                                                 free(block.data.application.data);
1516                                         break;
1517                                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1518                                         if(0 != block.data.vorbis_comment.vendor_string.entry)
1519                                                 free(block.data.vorbis_comment.vendor_string.entry);
1520                                         if(block.data.vorbis_comment.num_comments > 0)
1521                                                 for(i = 0; i < block.data.vorbis_comment.num_comments; i++)
1522                                                         if(0 != block.data.vorbis_comment.comments[i].entry)
1523                                                                 free(block.data.vorbis_comment.comments[i].entry);
1524                                         if(0 != block.data.vorbis_comment.comments)
1525                                                 free(block.data.vorbis_comment.comments);
1526                                         break;
1527                                 case FLAC__METADATA_TYPE_CUESHEET:
1528                                         if(block.data.cue_sheet.num_tracks > 0)
1529                                                 for(i = 0; i < block.data.cue_sheet.num_tracks; i++)
1530                                                         if(0 != block.data.cue_sheet.tracks[i].indices)
1531                                                                 free(block.data.cue_sheet.tracks[i].indices);
1532                                         if(0 != block.data.cue_sheet.tracks)
1533                                                 free(block.data.cue_sheet.tracks);
1534                                         break;
1535                                 case FLAC__METADATA_TYPE_PICTURE:
1536                                         if(0 != block.data.picture.mime_type)
1537                                                 free(block.data.picture.mime_type);
1538                                         if(0 != block.data.picture.description)
1539                                                 free(block.data.picture.description);
1540                                         if(0 != block.data.picture.data)
1541                                                 free(block.data.picture.data);
1542                                         break;
1543                                 case FLAC__METADATA_TYPE_STREAMINFO:
1544                                 case FLAC__METADATA_TYPE_SEEKTABLE:
1545                                         FLAC__ASSERT(0);
1546                                 default:
1547                                         if(0 != block.data.unknown.data)
1548                                                 free(block.data.unknown.data);
1549                                         break;
1550                         }
1551
1552                         if(!ok) /* anything that unsets "ok" should also make sure decoder->protected_->state is updated */
1553                                 return false;
1554                 }
1555         }
1556
1557         if(is_last) {
1558                 /* if this fails, it's OK, it's just a hint for the seek routine */
1559                 if(!FLAC__stream_decoder_get_decode_position(decoder, &decoder->private_->first_frame_offset))
1560                         decoder->private_->first_frame_offset = 0;
1561                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1562         }
1563
1564         return true;
1565 }
1566
1567 FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length)
1568 {
1569         FLAC__uint32 x;
1570         uint32_t bits, used_bits = 0;
1571
1572         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1573
1574         decoder->private_->stream_info.type = FLAC__METADATA_TYPE_STREAMINFO;
1575         decoder->private_->stream_info.is_last = is_last;
1576         decoder->private_->stream_info.length = length;
1577
1578         bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN;
1579         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, bits))
1580                 return false; /* read_callback_ sets the state for us */
1581         decoder->private_->stream_info.data.stream_info.min_blocksize = x;
1582         used_bits += bits;
1583
1584         bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN;
1585         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN))
1586                 return false; /* read_callback_ sets the state for us */
1587         decoder->private_->stream_info.data.stream_info.max_blocksize = x;
1588         used_bits += bits;
1589
1590         bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN;
1591         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN))
1592                 return false; /* read_callback_ sets the state for us */
1593         decoder->private_->stream_info.data.stream_info.min_framesize = x;
1594         used_bits += bits;
1595
1596         bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN;
1597         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN))
1598                 return false; /* read_callback_ sets the state for us */
1599         decoder->private_->stream_info.data.stream_info.max_framesize = x;
1600         used_bits += bits;
1601
1602         bits = FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN;
1603         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN))
1604                 return false; /* read_callback_ sets the state for us */
1605         decoder->private_->stream_info.data.stream_info.sample_rate = x;
1606         used_bits += bits;
1607
1608         bits = FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN;
1609         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN))
1610                 return false; /* read_callback_ sets the state for us */
1611         decoder->private_->stream_info.data.stream_info.channels = x+1;
1612         used_bits += bits;
1613
1614         bits = FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN;
1615         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN))
1616                 return false; /* read_callback_ sets the state for us */
1617         decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1;
1618         used_bits += bits;
1619
1620         bits = FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN;
1621         if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &decoder->private_->stream_info.data.stream_info.total_samples, FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN))
1622                 return false; /* read_callback_ sets the state for us */
1623         used_bits += bits;
1624
1625         if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16))
1626                 return false; /* read_callback_ sets the state for us */
1627         used_bits += 16*8;
1628
1629         /* skip the rest of the block */
1630         FLAC__ASSERT(used_bits % 8 == 0);
1631         length -= (used_bits / 8);
1632         if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
1633                 return false; /* read_callback_ sets the state for us */
1634
1635         return true;
1636 }
1637
1638 FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length)
1639 {
1640         FLAC__uint32 i, x;
1641         FLAC__uint64 xx;
1642
1643         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1644
1645         decoder->private_->seek_table.type = FLAC__METADATA_TYPE_SEEKTABLE;
1646         decoder->private_->seek_table.is_last = is_last;
1647         decoder->private_->seek_table.length = length;
1648
1649         decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1650
1651         /* use realloc since we may pass through here several times (e.g. after seeking) */
1652         if(0 == (decoder->private_->seek_table.data.seek_table.points = safe_realloc_mul_2op_(decoder->private_->seek_table.data.seek_table.points, decoder->private_->seek_table.data.seek_table.num_points, /*times*/sizeof(FLAC__StreamMetadata_SeekPoint)))) {
1653                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1654                 return false;
1655         }
1656         for(i = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) {
1657                 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN))
1658                         return false; /* read_callback_ sets the state for us */
1659                 decoder->private_->seek_table.data.seek_table.points[i].sample_number = xx;
1660
1661                 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN))
1662                         return false; /* read_callback_ sets the state for us */
1663                 decoder->private_->seek_table.data.seek_table.points[i].stream_offset = xx;
1664
1665                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN))
1666                         return false; /* read_callback_ sets the state for us */
1667                 decoder->private_->seek_table.data.seek_table.points[i].frame_samples = x;
1668         }
1669         length -= (decoder->private_->seek_table.data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH);
1670         /* if there is a partial point left, skip over it */
1671         if(length > 0) {
1672                 /*@@@ do a send_error_to_client_() here?  there's an argument for either way */
1673                 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
1674                         return false; /* read_callback_ sets the state for us */
1675         }
1676
1677         return true;
1678 }
1679
1680 FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj, uint32_t length)
1681 {
1682         FLAC__uint32 i;
1683
1684         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1685
1686         /* read vendor string */
1687         if (length >= 8) {
1688                 length -= 8; /* vendor string length + num comments entries alone take 8 bytes */
1689                 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1690                 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->vendor_string.length))
1691                         return false; /* read_callback_ sets the state for us */
1692                 if (obj->vendor_string.length > 0) {
1693                         if (length < obj->vendor_string.length) {
1694                                 obj->vendor_string.length = 0;
1695                                 obj->vendor_string.entry = 0;
1696                                 goto skip;
1697                         }
1698                         else
1699                                 length -= obj->vendor_string.length;
1700                         if (0 == (obj->vendor_string.entry = safe_malloc_add_2op_(obj->vendor_string.length, /*+*/1))) {
1701                                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1702                                 return false;
1703                         }
1704                         if (!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->vendor_string.entry, obj->vendor_string.length))
1705                                 return false; /* read_callback_ sets the state for us */
1706                         obj->vendor_string.entry[obj->vendor_string.length] = '\0';
1707                 }
1708                 else
1709                         obj->vendor_string.entry = 0;
1710
1711                 /* read num comments */
1712                 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN == 32);
1713                 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->num_comments))
1714                         return false; /* read_callback_ sets the state for us */
1715
1716                 /* read comments */
1717                 if (obj->num_comments > 100000) {
1718                         /* Possibly malicious file. */
1719                         obj->num_comments = 0;
1720                         return false;
1721                 }
1722                 if (obj->num_comments > 0) {
1723                         if (0 == (obj->comments = safe_malloc_mul_2op_p(obj->num_comments, /*times*/sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) {
1724                                 obj->num_comments = 0;
1725                                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1726                                 return false;
1727                         }
1728                         for (i = 0; i < obj->num_comments; i++) {
1729                                 /* Initialize here just to make sure. */
1730                                 obj->comments[i].length = 0;
1731                                 obj->comments[i].entry = 0;
1732
1733                                 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1734                                 if (length < 4) {
1735                                         obj->num_comments = i;
1736                                         goto skip;
1737                                 }
1738                                 else
1739                                         length -= 4;
1740                                 if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->comments[i].length)) {
1741                                         obj->num_comments = i;
1742                                         return false; /* read_callback_ sets the state for us */
1743                                 }
1744                                 if (obj->comments[i].length > 0) {
1745                                         if (length < obj->comments[i].length) {
1746                                                 obj->num_comments = i;
1747                                                 goto skip;
1748                                         }
1749                                         else
1750                                                 length -= obj->comments[i].length;
1751                                         if (0 == (obj->comments[i].entry = safe_malloc_add_2op_(obj->comments[i].length, /*+*/1))) {
1752                                                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1753                                                 obj->num_comments = i;
1754                                                 return false;
1755                                         }
1756                                         memset (obj->comments[i].entry, 0, obj->comments[i].length) ;
1757                                         if (!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->comments[i].entry, obj->comments[i].length)) {
1758                                                 /* Current i-th entry is bad, so we delete it. */
1759                                                 free (obj->comments[i].entry) ;
1760                                                 obj->comments[i].entry = NULL ;
1761                                                 obj->num_comments = i;
1762                                                 goto skip;
1763                                         }
1764                                         obj->comments[i].entry[obj->comments[i].length] = '\0';
1765                                 }
1766                                 else
1767                                         obj->comments[i].entry = 0;
1768                         }
1769                 }
1770         }
1771
1772   skip:
1773         if (length > 0) {
1774                 /* length > 0 can only happen on files with invalid data in comments */
1775                 if(obj->num_comments < 1) {
1776                         free(obj->comments);
1777                         obj->comments = NULL;
1778                 }
1779                 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
1780                         return false; /* read_callback_ sets the state for us */
1781         }
1782
1783         return true;
1784 }
1785
1786 FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj)
1787 {
1788         FLAC__uint32 i, j, x;
1789
1790         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1791
1792         memset(obj, 0, sizeof(FLAC__StreamMetadata_CueSheet));
1793
1794         FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
1795         if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->media_catalog_number, FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN/8))
1796                 return false; /* read_callback_ sets the state for us */
1797
1798         if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &obj->lead_in, FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN))
1799                 return false; /* read_callback_ sets the state for us */
1800
1801         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN))
1802                 return false; /* read_callback_ sets the state for us */
1803         obj->is_cd = x? true : false;
1804
1805         if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN))
1806                 return false; /* read_callback_ sets the state for us */
1807
1808         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN))
1809                 return false; /* read_callback_ sets the state for us */
1810         obj->num_tracks = x;
1811
1812         if(obj->num_tracks > 0) {
1813                 if(0 == (obj->tracks = safe_calloc_(obj->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track)))) {
1814                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1815                         return false;
1816                 }
1817                 for(i = 0; i < obj->num_tracks; i++) {
1818                         FLAC__StreamMetadata_CueSheet_Track *track = &obj->tracks[i];
1819                         if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &track->offset, FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN))
1820                                 return false; /* read_callback_ sets the state for us */
1821
1822                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN))
1823                                 return false; /* read_callback_ sets the state for us */
1824                         track->number = (FLAC__byte)x;
1825
1826                         FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
1827                         if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)track->isrc, FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN/8))
1828                                 return false; /* read_callback_ sets the state for us */
1829
1830                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN))
1831                                 return false; /* read_callback_ sets the state for us */
1832                         track->type = x;
1833
1834                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN))
1835                                 return false; /* read_callback_ sets the state for us */
1836                         track->pre_emphasis = x;
1837
1838                         if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN))
1839                                 return false; /* read_callback_ sets the state for us */
1840
1841                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN))
1842                                 return false; /* read_callback_ sets the state for us */
1843                         track->num_indices = (FLAC__byte)x;
1844
1845                         if(track->num_indices > 0) {
1846                                 if(0 == (track->indices = safe_calloc_(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index)))) {
1847                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1848                                         return false;
1849                                 }
1850                                 for(j = 0; j < track->num_indices; j++) {
1851                                         FLAC__StreamMetadata_CueSheet_Index *indx = &track->indices[j];
1852                                         if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &indx->offset, FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN))
1853                                                 return false; /* read_callback_ sets the state for us */
1854
1855                                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN))
1856                                                 return false; /* read_callback_ sets the state for us */
1857                                         indx->number = (FLAC__byte)x;
1858
1859                                         if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN))
1860                                                 return false; /* read_callback_ sets the state for us */
1861                                 }
1862                         }
1863                 }
1864         }
1865
1866         return true;
1867 }
1868
1869 FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj)
1870 {
1871         FLAC__uint32 x;
1872
1873         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1874
1875         /* read type */
1876         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_TYPE_LEN))
1877                 return false; /* read_callback_ sets the state for us */
1878         obj->type = x;
1879
1880         /* read MIME type */
1881         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN))
1882                 return false; /* read_callback_ sets the state for us */
1883         if(0 == (obj->mime_type = safe_malloc_add_2op_(x, /*+*/1))) {
1884                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1885                 return false;
1886         }
1887         if(x > 0) {
1888                 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->mime_type, x))
1889                         return false; /* read_callback_ sets the state for us */
1890         }
1891         obj->mime_type[x] = '\0';
1892
1893         /* read description */
1894         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN))
1895                 return false; /* read_callback_ sets the state for us */
1896         if(0 == (obj->description = safe_malloc_add_2op_(x, /*+*/1))) {
1897                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1898                 return false;
1899         }
1900         if(x > 0) {
1901                 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->description, x))
1902                         return false; /* read_callback_ sets the state for us */
1903         }
1904         obj->description[x] = '\0';
1905
1906         /* read width */
1907         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->width, FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN))
1908                 return false; /* read_callback_ sets the state for us */
1909
1910         /* read height */
1911         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->height, FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN))
1912                 return false; /* read_callback_ sets the state for us */
1913
1914         /* read depth */
1915         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->depth, FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN))
1916                 return false; /* read_callback_ sets the state for us */
1917
1918         /* read colors */
1919         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->colors, FLAC__STREAM_METADATA_PICTURE_COLORS_LEN))
1920                 return false; /* read_callback_ sets the state for us */
1921
1922         /* read data */
1923         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &(obj->data_length), FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN))
1924                 return false; /* read_callback_ sets the state for us */
1925         if(0 == (obj->data = safe_malloc_(obj->data_length))) {
1926                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1927                 return false;
1928         }
1929         if(obj->data_length > 0) {
1930                 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->data, obj->data_length))
1931                         return false; /* read_callback_ sets the state for us */
1932         }
1933
1934         return true;
1935 }
1936
1937 FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder)
1938 {
1939         FLAC__uint32 x;
1940         uint32_t i, skip;
1941
1942         /* skip the version and flags bytes */
1943         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 24))
1944                 return false; /* read_callback_ sets the state for us */
1945         /* get the size (in bytes) to skip */
1946         skip = 0;
1947         for(i = 0; i < 4; i++) {
1948                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1949                         return false; /* read_callback_ sets the state for us */
1950                 skip <<= 7;
1951                 skip |= (x & 0x7f);
1952         }
1953         /* skip the rest of the tag */
1954         if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, skip))
1955                 return false; /* read_callback_ sets the state for us */
1956         return true;
1957 }
1958
1959 FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder)
1960 {
1961         FLAC__uint32 x;
1962         FLAC__bool first = true;
1963
1964         /* If we know the total number of samples in the stream, stop if we've read that many. */
1965         /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */
1966         if(FLAC__stream_decoder_get_total_samples(decoder) > 0) {
1967                 if(decoder->private_->samples_decoded >= FLAC__stream_decoder_get_total_samples(decoder)) {
1968                         decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1969                         return true;
1970                 }
1971         }
1972
1973         /* make sure we're byte aligned */
1974         if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) {
1975                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input)))
1976                         return false; /* read_callback_ sets the state for us */
1977         }
1978
1979         while(1) {
1980                 if(decoder->private_->cached) {
1981                         x = (FLAC__uint32)decoder->private_->lookahead;
1982                         decoder->private_->cached = false;
1983                 }
1984                 else {
1985                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1986                                 return false; /* read_callback_ sets the state for us */
1987                 }
1988                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1989                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
1990                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1991                                 return false; /* read_callback_ sets the state for us */
1992
1993                         /* we have to check if we just read two 0xff's in a row; the second may actually be the beginning of the sync code */
1994                         /* else we have to check if the second byte is the end of a sync code */
1995                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1996                                 decoder->private_->lookahead = (FLAC__byte)x;
1997                                 decoder->private_->cached = true;
1998                         }
1999                         else if(x >> 1 == 0x7c) { /* MAGIC NUMBER for the last 6 sync bits and reserved 7th bit */
2000                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
2001                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
2002                                 return true;
2003                         }
2004                 }
2005                 if(first) {
2006                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2007                         first = false;
2008                 }
2009         }
2010
2011         return true;
2012 }
2013
2014 FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode)
2015 {
2016         uint32_t channel;
2017         uint32_t i;
2018         FLAC__int32 mid, side;
2019         uint32_t frame_crc; /* the one we calculate from the input stream */
2020         FLAC__uint32 x;
2021
2022         *got_a_frame = false;
2023
2024         /* init the CRC */
2025         frame_crc = 0;
2026         frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc);
2027         frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc);
2028         FLAC__bitreader_reset_read_crc16(decoder->private_->input, (FLAC__uint16)frame_crc);
2029
2030         if(!read_frame_header_(decoder))
2031                 return false;
2032         if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means we didn't sync on a valid header */
2033                 return true;
2034         if(!allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels))
2035                 return false;
2036         for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
2037                 /*
2038                  * first figure the correct bits-per-sample of the subframe
2039                  */
2040                 uint32_t bps = decoder->private_->frame.header.bits_per_sample;
2041                 switch(decoder->private_->frame.header.channel_assignment) {
2042                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
2043                                 /* no adjustment needed */
2044                                 break;
2045                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
2046                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2047                                 if(channel == 1)
2048                                         bps++;
2049                                 break;
2050                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
2051                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2052                                 if(channel == 0)
2053                                         bps++;
2054                                 break;
2055                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
2056                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2057                                 if(channel == 1)
2058                                         bps++;
2059                                 break;
2060                         default:
2061                                 FLAC__ASSERT(0);
2062                 }
2063                 /*
2064                  * now read it
2065                  */
2066                 if(!read_subframe_(decoder, channel, bps, do_full_decode))
2067                         return false;
2068                 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2069                         return true;
2070         }
2071         if(!read_zero_padding_(decoder))
2072                 return false;
2073         if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption (i.e. "zero bits" were not all zeroes) */
2074                 return true;
2075
2076         /*
2077          * Read the frame CRC-16 from the footer and check
2078          */
2079         frame_crc = FLAC__bitreader_get_read_crc16(decoder->private_->input);
2080         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN))
2081                 return false; /* read_callback_ sets the state for us */
2082         if(frame_crc == x) {
2083                 if(do_full_decode) {
2084                         /* Undo any special channel coding */
2085                         switch(decoder->private_->frame.header.channel_assignment) {
2086                                 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
2087                                         /* do nothing */
2088                                         break;
2089                                 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
2090                                         FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2091                                         for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2092                                                 decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i];
2093                                         break;
2094                                 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
2095                                         FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2096                                         for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2097                                                 decoder->private_->output[0][i] += decoder->private_->output[1][i];
2098                                         break;
2099                                 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
2100                                         FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2101                                         for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2102 #if 1
2103                                                 mid = decoder->private_->output[0][i];
2104                                                 side = decoder->private_->output[1][i];
2105                                                 mid = ((uint32_t) mid) << 1;
2106                                                 mid |= (side & 1); /* i.e. if 'side' is odd... */
2107                                                 decoder->private_->output[0][i] = (mid + side) >> 1;
2108                                                 decoder->private_->output[1][i] = (mid - side) >> 1;
2109 #else
2110                                                 /* OPT: without 'side' temp variable */
2111                                                 mid = (decoder->private_->output[0][i] << 1) | (decoder->private_->output[1][i] & 1); /* i.e. if 'side' is odd... */
2112                                                 decoder->private_->output[0][i] = (mid + decoder->private_->output[1][i]) >> 1;
2113                                                 decoder->private_->output[1][i] = (mid - decoder->private_->output[1][i]) >> 1;
2114 #endif
2115                                         }
2116                                         break;
2117                                 default:
2118                                         FLAC__ASSERT(0);
2119                                         break;
2120                         }
2121                 }
2122         }
2123         else {
2124                 /* Bad frame, emit error and zero the output signal */
2125                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH);
2126                 if(do_full_decode) {
2127                         for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
2128                                 memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
2129                         }
2130                 }
2131         }
2132
2133         *got_a_frame = true;
2134
2135         /* we wait to update fixed_block_size until here, when we're sure we've got a proper frame and hence a correct blocksize */
2136         if(decoder->private_->next_fixed_block_size)
2137                 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size;
2138
2139         /* put the latest values into the public section of the decoder instance */
2140         decoder->protected_->channels = decoder->private_->frame.header.channels;
2141         decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment;
2142         decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample;
2143         decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate;
2144         decoder->protected_->blocksize = decoder->private_->frame.header.blocksize;
2145
2146         FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
2147         decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize;
2148
2149         /* write it */
2150         if(do_full_decode) {
2151                 if(write_audio_frame_to_client_(decoder, &decoder->private_->frame, (const FLAC__int32 * const *)decoder->private_->output) != FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE) {
2152                         decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2153                         return false;
2154                 }
2155         }
2156
2157         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2158         return true;
2159 }
2160
2161 FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder)
2162 {
2163         FLAC__uint32 x;
2164         FLAC__uint64 xx;
2165         uint32_t i, blocksize_hint = 0, sample_rate_hint = 0;
2166         FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */
2167         uint32_t raw_header_len;
2168         FLAC__bool is_unparseable = false;
2169
2170         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
2171
2172         /* init the raw header with the saved bits from synchronization */
2173         raw_header[0] = decoder->private_->header_warmup[0];
2174         raw_header[1] = decoder->private_->header_warmup[1];
2175         raw_header_len = 2;
2176
2177         /* check to make sure that reserved bit is 0 */
2178         if(raw_header[1] & 0x02) /* MAGIC NUMBER */
2179                 is_unparseable = true;
2180
2181         /*
2182          * Note that along the way as we read the header, we look for a sync
2183          * code inside.  If we find one it would indicate that our original
2184          * sync was bad since there cannot be a sync code in a valid header.
2185          *
2186          * Three kinds of things can go wrong when reading the frame header:
2187          *  1) We may have sync'ed incorrectly and not landed on a frame header.
2188          *     If we don't find a sync code, it can end up looking like we read
2189          *     a valid but unparseable header, until getting to the frame header
2190          *     CRC.  Even then we could get a false positive on the CRC.
2191          *  2) We may have sync'ed correctly but on an unparseable frame (from a
2192          *     future encoder).
2193          *  3) We may be on a damaged frame which appears valid but unparseable.
2194          *
2195          * For all these reasons, we try and read a complete frame header as
2196          * long as it seems valid, even if unparseable, up until the frame
2197          * header CRC.
2198          */
2199
2200         /*
2201          * read in the raw header as bytes so we can CRC it, and parse it on the way
2202          */
2203         for(i = 0; i < 2; i++) {
2204                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2205                         return false; /* read_callback_ sets the state for us */
2206                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
2207                         /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */
2208                         decoder->private_->lookahead = (FLAC__byte)x;
2209                         decoder->private_->cached = true;
2210                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2211                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2212                         return true;
2213                 }
2214                 raw_header[raw_header_len++] = (FLAC__byte)x;
2215         }
2216
2217         switch(x = raw_header[2] >> 4) {
2218                 case 0:
2219                         is_unparseable = true;
2220                         break;
2221                 case 1:
2222                         decoder->private_->frame.header.blocksize = 192;
2223                         break;
2224                 case 2:
2225                 case 3:
2226                 case 4:
2227                 case 5:
2228                         decoder->private_->frame.header.blocksize = 576 << (x-2);
2229                         break;
2230                 case 6:
2231                 case 7:
2232                         blocksize_hint = x;
2233                         break;
2234                 case 8:
2235                 case 9:
2236                 case 10:
2237                 case 11:
2238                 case 12:
2239                 case 13:
2240                 case 14:
2241                 case 15:
2242                         decoder->private_->frame.header.blocksize = 256 << (x-8);
2243                         break;
2244                 default:
2245                         FLAC__ASSERT(0);
2246                         break;
2247         }
2248
2249         switch(x = raw_header[2] & 0x0f) {
2250                 case 0:
2251                         if(decoder->private_->has_stream_info)
2252                                 decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate;
2253                         else
2254                                 is_unparseable = true;
2255                         break;
2256                 case 1:
2257                         decoder->private_->frame.header.sample_rate = 88200;
2258                         break;
2259                 case 2:
2260                         decoder->private_->frame.header.sample_rate = 176400;
2261                         break;
2262                 case 3:
2263                         decoder->private_->frame.header.sample_rate = 192000;
2264                         break;
2265                 case 4:
2266                         decoder->private_->frame.header.sample_rate = 8000;
2267                         break;
2268                 case 5:
2269                         decoder->private_->frame.header.sample_rate = 16000;
2270                         break;
2271                 case 6:
2272                         decoder->private_->frame.header.sample_rate = 22050;
2273                         break;
2274                 case 7:
2275                         decoder->private_->frame.header.sample_rate = 24000;
2276                         break;
2277                 case 8:
2278                         decoder->private_->frame.header.sample_rate = 32000;
2279                         break;
2280                 case 9:
2281                         decoder->private_->frame.header.sample_rate = 44100;
2282                         break;
2283                 case 10:
2284                         decoder->private_->frame.header.sample_rate = 48000;
2285                         break;
2286                 case 11:
2287                         decoder->private_->frame.header.sample_rate = 96000;
2288                         break;
2289                 case 12:
2290                 case 13:
2291                 case 14:
2292                         sample_rate_hint = x;
2293                         break;
2294                 case 15:
2295                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2296                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2297                         return true;
2298                 default:
2299                         FLAC__ASSERT(0);
2300         }
2301
2302         x = (uint32_t)(raw_header[3] >> 4);
2303         if(x & 8) {
2304                 decoder->private_->frame.header.channels = 2;
2305                 switch(x & 7) {
2306                         case 0:
2307                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
2308                                 break;
2309                         case 1:
2310                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
2311                                 break;
2312                         case 2:
2313                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
2314                                 break;
2315                         default:
2316                                 is_unparseable = true;
2317                                 break;
2318                 }
2319         }
2320         else {
2321                 decoder->private_->frame.header.channels = (uint32_t)x + 1;
2322                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
2323         }
2324
2325         switch(x = (uint32_t)(raw_header[3] & 0x0e) >> 1) {
2326                 case 0:
2327                         if(decoder->private_->has_stream_info)
2328                                 decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample;
2329                         else
2330                                 is_unparseable = true;
2331                         break;
2332                 case 1:
2333                         decoder->private_->frame.header.bits_per_sample = 8;
2334                         break;
2335                 case 2:
2336                         decoder->private_->frame.header.bits_per_sample = 12;
2337                         break;
2338                 case 4:
2339                         decoder->private_->frame.header.bits_per_sample = 16;
2340                         break;
2341                 case 5:
2342                         decoder->private_->frame.header.bits_per_sample = 20;
2343                         break;
2344                 case 6:
2345                         decoder->private_->frame.header.bits_per_sample = 24;
2346                         break;
2347                 case 3:
2348                 case 7:
2349                         is_unparseable = true;
2350                         break;
2351                 default:
2352                         FLAC__ASSERT(0);
2353                         break;
2354         }
2355
2356         /* check to make sure that reserved bit is 0 */
2357         if(raw_header[3] & 0x01) /* MAGIC NUMBER */
2358                 is_unparseable = true;
2359
2360         /* read the frame's starting sample number (or frame number as the case may be) */
2361         if(
2362                 raw_header[1] & 0x01 ||
2363                 /*@@@ this clause is a concession to the old way of doing variable blocksize; the only known implementation is flake and can probably be removed without inconveniencing anyone */
2364                 (decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.min_blocksize != decoder->private_->stream_info.data.stream_info.max_blocksize)
2365         ) { /* variable blocksize */
2366                 if(!FLAC__bitreader_read_utf8_uint64(decoder->private_->input, &xx, raw_header, &raw_header_len))
2367                         return false; /* read_callback_ sets the state for us */
2368                 if(xx == FLAC__U64L(0xffffffffffffffff)) { /* i.e. non-UTF8 code... */
2369                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
2370                         decoder->private_->cached = true;
2371                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2372                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2373                         return true;
2374                 }
2375                 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
2376                 decoder->private_->frame.header.number.sample_number = xx;
2377         }
2378         else { /* fixed blocksize */
2379                 if(!FLAC__bitreader_read_utf8_uint32(decoder->private_->input, &x, raw_header, &raw_header_len))
2380                         return false; /* read_callback_ sets the state for us */
2381                 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */
2382                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
2383                         decoder->private_->cached = true;
2384                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2385                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2386                         return true;
2387                 }
2388                 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER;
2389                 decoder->private_->frame.header.number.frame_number = x;
2390         }
2391
2392         if(blocksize_hint) {
2393                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2394                         return false; /* read_callback_ sets the state for us */
2395                 raw_header[raw_header_len++] = (FLAC__byte)x;
2396                 if(blocksize_hint == 7) {
2397                         FLAC__uint32 _x;
2398                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8))
2399                                 return false; /* read_callback_ sets the state for us */
2400                         raw_header[raw_header_len++] = (FLAC__byte)_x;
2401                         x = (x << 8) | _x;
2402                 }
2403                 decoder->private_->frame.header.blocksize = x+1;
2404         }
2405
2406         if(sample_rate_hint) {
2407                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2408                         return false; /* read_callback_ sets the state for us */
2409                 raw_header[raw_header_len++] = (FLAC__byte)x;
2410                 if(sample_rate_hint != 12) {
2411                         FLAC__uint32 _x;
2412                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8))
2413                                 return false; /* read_callback_ sets the state for us */
2414                         raw_header[raw_header_len++] = (FLAC__byte)_x;
2415                         x = (x << 8) | _x;
2416                 }
2417                 if(sample_rate_hint == 12)
2418                         decoder->private_->frame.header.sample_rate = x*1000;
2419                 else if(sample_rate_hint == 13)
2420                         decoder->private_->frame.header.sample_rate = x;
2421                 else
2422                         decoder->private_->frame.header.sample_rate = x*10;
2423         }
2424
2425         /* read the CRC-8 byte */
2426         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2427                 return false; /* read_callback_ sets the state for us */
2428         crc8 = (FLAC__byte)x;
2429
2430         if(FLAC__crc8(raw_header, raw_header_len) != crc8) {
2431                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2432                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2433                 return true;
2434         }
2435
2436         /* calculate the sample number from the frame number if needed */
2437         decoder->private_->next_fixed_block_size = 0;
2438         if(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER) {
2439                 x = decoder->private_->frame.header.number.frame_number;
2440                 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
2441                 if(decoder->private_->fixed_block_size)
2442                         decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->fixed_block_size * (FLAC__uint64)x;
2443                 else if(decoder->private_->has_stream_info) {
2444                         if(decoder->private_->stream_info.data.stream_info.min_blocksize == decoder->private_->stream_info.data.stream_info.max_blocksize) {
2445                                 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__uint64)x;
2446                                 decoder->private_->next_fixed_block_size = decoder->private_->stream_info.data.stream_info.max_blocksize;
2447                         }
2448                         else
2449                                 is_unparseable = true;
2450                 }
2451                 else if(x == 0) {
2452                         decoder->private_->frame.header.number.sample_number = 0;
2453                         decoder->private_->next_fixed_block_size = decoder->private_->frame.header.blocksize;
2454                 }
2455                 else {
2456                         /* can only get here if the stream has invalid frame numbering and no STREAMINFO, so assume it's not the last (possibly short) frame */
2457                         decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->frame.header.blocksize * (FLAC__uint64)x;
2458                 }
2459         }
2460
2461         if(is_unparseable) {
2462                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2463                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2464                 return true;
2465         }
2466
2467         return true;
2468 }
2469
2470 FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode)
2471 {
2472         FLAC__uint32 x;
2473         FLAC__bool wasted_bits;
2474         uint32_t i;
2475
2476         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) /* MAGIC NUMBER */
2477                 return false; /* read_callback_ sets the state for us */
2478
2479         wasted_bits = (x & 1);
2480         x &= 0xfe;
2481
2482         if(wasted_bits) {
2483                 uint32_t u;
2484                 if(!FLAC__bitreader_read_unary_unsigned(decoder->private_->input, &u))
2485                         return false; /* read_callback_ sets the state for us */
2486                 decoder->private_->frame.subframes[channel].wasted_bits = u+1;
2487                 if (decoder->private_->frame.subframes[channel].wasted_bits >= bps)
2488                         return false;
2489                 bps -= decoder->private_->frame.subframes[channel].wasted_bits;
2490         }
2491         else
2492                 decoder->private_->frame.subframes[channel].wasted_bits = 0;
2493
2494         /*
2495          * Lots of magic numbers here
2496          */
2497         if(x & 0x80) {
2498                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2499                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2500                 return true;
2501         }
2502         else if(x == 0) {
2503                 if(!read_subframe_constant_(decoder, channel, bps, do_full_decode))
2504                         return false;
2505         }
2506         else if(x == 2) {
2507                 if(!read_subframe_verbatim_(decoder, channel, bps, do_full_decode))
2508                         return false;
2509         }
2510         else if(x < 16) {
2511                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2512                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2513                 return true;
2514         }
2515         else if(x <= 24) {
2516                 if(!read_subframe_fixed_(decoder, channel, bps, (x>>1)&7, do_full_decode))
2517                         return false;
2518                 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2519                         return true;
2520         }
2521         else if(x < 64) {
2522                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2523                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2524                 return true;
2525         }
2526         else {
2527                 if(!read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1, do_full_decode))
2528                         return false;
2529                 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2530                         return true;
2531         }
2532
2533         if(wasted_bits && do_full_decode) {
2534                 x = decoder->private_->frame.subframes[channel].wasted_bits;
2535                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2536                         uint32_t val = decoder->private_->output[channel][i];
2537                         decoder->private_->output[channel][i] = (val << x);
2538                 }
2539         }
2540
2541         return true;
2542 }
2543
2544 FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode)
2545 {
2546         FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant;
2547         FLAC__int32 x;
2548         uint32_t i;
2549         FLAC__int32 *output = decoder->private_->output[channel];
2550
2551         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT;
2552
2553         if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps))
2554                 return false; /* read_callback_ sets the state for us */
2555
2556         subframe->value = x;
2557
2558         /* decode the subframe */
2559         if(do_full_decode) {
2560                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2561                         output[i] = x;
2562         }
2563
2564         return true;
2565 }
2566
2567 FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode)
2568 {
2569         FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed;
2570         FLAC__int32 i32;
2571         FLAC__uint32 u32;
2572         uint32_t u;
2573
2574         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED;
2575
2576         subframe->residual = decoder->private_->residual[channel];
2577         subframe->order = order;
2578
2579         /* read warm-up samples */
2580         for(u = 0; u < order; u++) {
2581                 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps))
2582                         return false; /* read_callback_ sets the state for us */
2583                 subframe->warmup[u] = i32;
2584         }
2585
2586         /* read entropy coding method info */
2587         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN))
2588                 return false; /* read_callback_ sets the state for us */
2589         subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
2590         switch(subframe->entropy_coding_method.type) {
2591                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2592                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2593                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
2594                                 return false; /* read_callback_ sets the state for us */
2595                         if(decoder->private_->frame.header.blocksize >> u32 < order) {
2596                                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2597                                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2598                                 return true;
2599                         }
2600                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
2601                         subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
2602                         break;
2603                 default:
2604                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2605                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2606                         return true;
2607         }
2608
2609         /* read residual */
2610         switch(subframe->entropy_coding_method.type) {
2611                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2612                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2613                         if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel], /*is_extended=*/subframe->entropy_coding_method.type == FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2))
2614                                 return false;
2615                         break;
2616                 default:
2617                         FLAC__ASSERT(0);
2618         }
2619
2620         /* decode the subframe */
2621         if(do_full_decode) {
2622                 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
2623                 FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order);
2624         }
2625
2626         return true;
2627 }
2628
2629 FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode)
2630 {
2631         FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc;
2632         FLAC__int32 i32;
2633         FLAC__uint32 u32;
2634         uint32_t u;
2635
2636         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC;
2637
2638         subframe->residual = decoder->private_->residual[channel];
2639         subframe->order = order;
2640
2641         /* read warm-up samples */
2642         for(u = 0; u < order; u++) {
2643                 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps))
2644                         return false; /* read_callback_ sets the state for us */
2645                 subframe->warmup[u] = i32;
2646         }
2647
2648         /* read qlp coeff precision */
2649         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN))
2650                 return false; /* read_callback_ sets the state for us */
2651         if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) {
2652                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2653                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2654                 return true;
2655         }
2656         subframe->qlp_coeff_precision = u32+1;
2657
2658         /* read qlp shift */
2659         if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN))
2660                 return false; /* read_callback_ sets the state for us */
2661         if(i32 < 0) {
2662                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2663                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2664                 return true;
2665         }
2666         subframe->quantization_level = i32;
2667
2668         /* read quantized lp coefficiencts */
2669         for(u = 0; u < order; u++) {
2670                 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision))
2671                         return false; /* read_callback_ sets the state for us */
2672                 subframe->qlp_coeff[u] = i32;
2673         }
2674
2675         /* read entropy coding method info */
2676         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN))
2677                 return false; /* read_callback_ sets the state for us */
2678         subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
2679         switch(subframe->entropy_coding_method.type) {
2680                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2681                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2682                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
2683                                 return false; /* read_callback_ sets the state for us */
2684                         if(decoder->private_->frame.header.blocksize >> u32 < order) {
2685                                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2686                                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2687                                 return true;
2688                         }
2689                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
2690                         subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
2691                         break;
2692                 default:
2693                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2694                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2695                         return true;
2696         }
2697
2698         /* read residual */
2699         switch(subframe->entropy_coding_method.type) {
2700                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2701                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2702                         if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel], /*is_extended=*/subframe->entropy_coding_method.type == FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2))
2703                                 return false;
2704                         break;
2705                 default:
2706                         FLAC__ASSERT(0);
2707         }
2708
2709         /* decode the subframe */
2710         if(do_full_decode) {
2711                 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
2712                 if(bps + subframe->qlp_coeff_precision + FLAC__bitmath_ilog2(order) <= 32)
2713                         if(bps <= 16 && subframe->qlp_coeff_precision <= 16)
2714                                 decoder->private_->local_lpc_restore_signal_16bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2715                         else
2716                                 decoder->private_->local_lpc_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2717                 else
2718                         decoder->private_->local_lpc_restore_signal_64bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2719         }
2720
2721         return true;
2722 }
2723
2724 FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode)
2725 {
2726         FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim;
2727         FLAC__int32 x, *residual = decoder->private_->residual[channel];
2728         uint32_t i;
2729
2730         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM;
2731
2732         subframe->data = residual;
2733
2734         for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2735                 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps))
2736                         return false; /* read_callback_ sets the state for us */
2737                 residual[i] = x;
2738         }
2739
2740         /* decode the subframe */
2741         if(do_full_decode)
2742                 memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
2743
2744         return true;
2745 }
2746
2747 FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, uint32_t predictor_order, uint32_t partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended)
2748 {
2749         FLAC__uint32 rice_parameter;
2750         int i;
2751         uint32_t partition, sample, u;
2752         const uint32_t partitions = 1u << partition_order;
2753         const uint32_t partition_samples = partition_order > 0? decoder->private_->frame.header.blocksize >> partition_order : decoder->private_->frame.header.blocksize - predictor_order;
2754         const uint32_t plen = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
2755         const uint32_t pesc = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_ESCAPE_PARAMETER : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
2756
2757         /* invalid predictor and partition orders mush be handled in the callers */
2758         FLAC__ASSERT(partition_order > 0? partition_samples >= predictor_order : decoder->private_->frame.header.blocksize >= predictor_order);
2759
2760         if(!FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, flac_max(6u, partition_order))) {
2761                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
2762                 return false;
2763         }
2764
2765         sample = 0;
2766         for(partition = 0; partition < partitions; partition++) {
2767                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, plen))
2768                         return false; /* read_callback_ sets the state for us */
2769                 partitioned_rice_contents->parameters[partition] = rice_parameter;
2770                 if(rice_parameter < pesc) {
2771                         partitioned_rice_contents->raw_bits[partition] = 0;
2772                         u = (partition_order == 0 || partition > 0)? partition_samples : partition_samples - predictor_order;
2773                         if(!FLAC__bitreader_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter))
2774                                 return false; /* read_callback_ sets the state for us */
2775                         sample += u;
2776                 }
2777                 else {
2778                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN))
2779                                 return false; /* read_callback_ sets the state for us */
2780                         partitioned_rice_contents->raw_bits[partition] = rice_parameter;
2781                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
2782                                 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i, rice_parameter))
2783                                         return false; /* read_callback_ sets the state for us */
2784                                 residual[sample] = i;
2785                         }
2786                 }
2787         }
2788
2789         return true;
2790 }
2791
2792 FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder)
2793 {
2794         if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) {
2795                 FLAC__uint32 zero = 0;
2796                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input)))
2797                         return false; /* read_callback_ sets the state for us */
2798                 if(zero != 0) {
2799                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2800                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2801                 }
2802         }
2803         return true;
2804 }
2805
2806 FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data)
2807 {
2808         FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data;
2809
2810         if(
2811 #if FLAC__HAS_OGG
2812                 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */
2813                 !decoder->private_->is_ogg &&
2814 #endif
2815                 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data)
2816         ) {
2817                 *bytes = 0;
2818                 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
2819                 return false;
2820         }
2821         else if(*bytes > 0) {
2822                 /* While seeking, it is possible for our seek to land in the
2823                  * middle of audio data that looks exactly like a frame header
2824                  * from a future version of an encoder.  When that happens, our
2825                  * error callback will get an
2826                  * FLAC__STREAM_DECODER_UNPARSEABLE_STREAM and increment its
2827                  * unparseable_frame_count.  But there is a remote possibility
2828                  * that it is properly synced at such a "future-codec frame",
2829                  * so to make sure, we wait to see many "unparseable" errors in
2830                  * a row before bailing out.
2831                  */
2832                 if(decoder->private_->is_seeking && decoder->private_->unparseable_frame_count > 20) {
2833                         decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2834                         return false;
2835                 }
2836                 else {
2837                         const FLAC__StreamDecoderReadStatus status =
2838 #if FLAC__HAS_OGG
2839                                 decoder->private_->is_ogg?
2840                                 read_callback_ogg_aspect_(decoder, buffer, bytes) :
2841 #endif
2842                                 decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data)
2843                         ;
2844                         if(status == FLAC__STREAM_DECODER_READ_STATUS_ABORT) {
2845                                 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2846                                 return false;
2847                         }
2848                         else if(*bytes == 0) {
2849                                 if(
2850                                         status == FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM ||
2851                                         (
2852 #if FLAC__HAS_OGG
2853                                                 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */
2854                                                 !decoder->private_->is_ogg &&
2855 #endif
2856                                                 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data)
2857                                         )
2858                                 ) {
2859                                         decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
2860                                         return false;
2861                                 }
2862                                 else
2863                                         return true;
2864                         }
2865                         else
2866                                 return true;
2867                 }
2868         }
2869         else {
2870                 /* abort to avoid a deadlock */
2871                 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2872                 return false;
2873         }
2874         /* [1] @@@ HACK NOTE: The end-of-stream checking has to be hacked around
2875          * for Ogg FLAC.  This is because the ogg decoder aspect can lose sync
2876          * and at the same time hit the end of the stream (for example, seeking
2877          * to a point that is after the beginning of the last Ogg page).  There
2878          * is no way to report an Ogg sync loss through the callbacks (see note
2879          * in read_callback_ogg_aspect_()) so it returns CONTINUE with *bytes==0.
2880          * So to keep the decoder from stopping at this point we gate the call
2881          * to the eof_callback and let the Ogg decoder aspect set the
2882          * end-of-stream state when it is needed.
2883          */
2884 }
2885
2886 #if FLAC__HAS_OGG
2887 FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes)
2888 {
2889         switch(FLAC__ogg_decoder_aspect_read_callback_wrapper(&decoder->protected_->ogg_decoder_aspect, buffer, bytes, read_callback_proxy_, decoder, decoder->private_->client_data)) {
2890                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK:
2891                         return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
2892                 /* we don't really have a way to handle lost sync via read
2893                  * callback so we'll let it pass and let the underlying
2894                  * FLAC decoder catch the error
2895                  */
2896                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_LOST_SYNC:
2897                         return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
2898                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM:
2899                         return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
2900                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_NOT_FLAC:
2901                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_UNSUPPORTED_MAPPING_VERSION:
2902                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT:
2903                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ERROR:
2904                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_MEMORY_ALLOCATION_ERROR:
2905                         return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
2906                 default:
2907                         FLAC__ASSERT(0);
2908                         /* double protection */
2909                         return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
2910         }
2911 }
2912
2913 FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
2914 {
2915         FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder*)void_decoder;
2916
2917         switch(decoder->private_->read_callback(decoder, buffer, bytes, client_data)) {
2918                 case FLAC__STREAM_DECODER_READ_STATUS_CONTINUE:
2919                         return FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK;
2920                 case FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM:
2921                         return FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM;
2922                 case FLAC__STREAM_DECODER_READ_STATUS_ABORT:
2923                         return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT;
2924                 default:
2925                         /* double protection: */
2926                         FLAC__ASSERT(0);
2927                         return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT;
2928         }
2929 }
2930 #endif
2931
2932 FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[])
2933 {
2934         if(decoder->private_->is_seeking) {
2935                 FLAC__uint64 this_frame_sample = frame->header.number.sample_number;
2936                 FLAC__uint64 next_frame_sample = this_frame_sample + (FLAC__uint64)frame->header.blocksize;
2937                 FLAC__uint64 target_sample = decoder->private_->target_sample;
2938
2939                 FLAC__ASSERT(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
2940
2941 #if FLAC__HAS_OGG
2942                 decoder->private_->got_a_frame = true;
2943 #endif
2944                 decoder->private_->last_frame = *frame; /* save the frame */
2945                 if(this_frame_sample <= target_sample && target_sample < next_frame_sample) { /* we hit our target frame */
2946                         uint32_t delta = (uint32_t)(target_sample - this_frame_sample);
2947                         /* kick out of seek mode */
2948                         decoder->private_->is_seeking = false;
2949                         /* shift out the samples before target_sample */
2950                         if(delta > 0) {
2951                                 uint32_t channel;
2952                                 const FLAC__int32 *newbuffer[FLAC__MAX_CHANNELS];
2953                                 for(channel = 0; channel < frame->header.channels; channel++)
2954                                         newbuffer[channel] = buffer[channel] + delta;
2955                                 decoder->private_->last_frame.header.blocksize -= delta;
2956                                 decoder->private_->last_frame.header.number.sample_number += (FLAC__uint64)delta;
2957                                 /* write the relevant samples */
2958                                 return decoder->private_->write_callback(decoder, &decoder->private_->last_frame, newbuffer, decoder->private_->client_data);
2959                         }
2960                         else {
2961                                 /* write the relevant samples */
2962                                 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data);
2963                         }
2964                 }
2965                 else {
2966                         return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
2967                 }
2968         }
2969         else {
2970                 /*
2971                  * If we never got STREAMINFO, turn off MD5 checking to save
2972                  * cycles since we don't have a sum to compare to anyway
2973                  */
2974                 if(!decoder->private_->has_stream_info)
2975                         decoder->private_->do_md5_checking = false;
2976                 if(decoder->private_->do_md5_checking) {
2977                         if(!FLAC__MD5Accumulate(&decoder->private_->md5context, buffer, frame->header.channels, frame->header.blocksize, (frame->header.bits_per_sample+7) / 8))
2978                                 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
2979                 }
2980                 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data);
2981         }
2982 }
2983
2984 void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status)
2985 {
2986         if(!decoder->private_->is_seeking)
2987                 decoder->private_->error_callback(decoder, status, decoder->private_->client_data);
2988         else if(status == FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM)
2989                 decoder->private_->unparseable_frame_count++;
2990 }
2991
2992 FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample)
2993 {
2994         FLAC__uint64 first_frame_offset = decoder->private_->first_frame_offset, lower_bound, upper_bound, lower_bound_sample, upper_bound_sample, this_frame_sample;
2995         FLAC__int64 pos = -1;
2996         int i;
2997         uint32_t approx_bytes_per_frame;
2998         FLAC__bool first_seek = true;
2999         const FLAC__uint64 total_samples = FLAC__stream_decoder_get_total_samples(decoder);
3000         const uint32_t min_blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize;
3001         const uint32_t max_blocksize = decoder->private_->stream_info.data.stream_info.max_blocksize;
3002         const uint32_t max_framesize = decoder->private_->stream_info.data.stream_info.max_framesize;
3003         const uint32_t min_framesize = decoder->private_->stream_info.data.stream_info.min_framesize;
3004         /* take these from the current frame in case they've changed mid-stream */
3005         uint32_t channels = FLAC__stream_decoder_get_channels(decoder);
3006         uint32_t bps = FLAC__stream_decoder_get_bits_per_sample(decoder);
3007         const FLAC__StreamMetadata_SeekTable *seek_table = decoder->private_->has_seek_table? &decoder->private_->seek_table.data.seek_table : 0;
3008
3009         /* use values from stream info if we didn't decode a frame */
3010         if(channels == 0)
3011                 channels = decoder->private_->stream_info.data.stream_info.channels;
3012         if(bps == 0)
3013                 bps = decoder->private_->stream_info.data.stream_info.bits_per_sample;
3014
3015         /* we are just guessing here */
3016         if(max_framesize > 0)
3017                 approx_bytes_per_frame = (max_framesize + min_framesize) / 2 + 1;
3018         /*
3019          * Check if it's a known fixed-blocksize stream.  Note that though
3020          * the spec doesn't allow zeroes in the STREAMINFO block, we may
3021          * never get a STREAMINFO block when decoding so the value of
3022          * min_blocksize might be zero.
3023          */
3024         else if(min_blocksize == max_blocksize && min_blocksize > 0) {
3025                 /* note there are no () around 'bps/8' to keep precision up since it's an integer calculation */
3026                 approx_bytes_per_frame = min_blocksize * channels * bps/8 + 64;
3027         }
3028         else
3029                 approx_bytes_per_frame = 4096 * channels * bps/8 + 64;
3030
3031         /*
3032          * First, we set an upper and lower bound on where in the
3033          * stream we will search.  For now we assume the worst case
3034          * scenario, which is our best guess at the beginning of
3035          * the first frame and end of the stream.
3036          */
3037         lower_bound = first_frame_offset;
3038         lower_bound_sample = 0;
3039         upper_bound = stream_length;
3040         upper_bound_sample = total_samples > 0 ? total_samples : target_sample /*estimate it*/;
3041
3042         /*
3043          * Now we refine the bounds if we have a seektable with
3044          * suitable points.  Note that according to the spec they
3045          * must be ordered by ascending sample number.
3046          *
3047          * Note: to protect against invalid seek tables we will ignore points
3048          * that have frame_samples==0 or sample_number>=total_samples
3049          */
3050         if(seek_table) {
3051                 FLAC__uint64 new_lower_bound = lower_bound;
3052                 FLAC__uint64 new_upper_bound = upper_bound;
3053                 FLAC__uint64 new_lower_bound_sample = lower_bound_sample;
3054                 FLAC__uint64 new_upper_bound_sample = upper_bound_sample;
3055
3056                 /* find the closest seek point <= target_sample, if it exists */
3057                 for(i = (int)seek_table->num_points - 1; i >= 0; i--) {
3058                         if(
3059                                 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
3060                                 seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */
3061                                 (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */
3062                                 seek_table->points[i].sample_number <= target_sample
3063                         )
3064                                 break;
3065                 }
3066                 if(i >= 0) { /* i.e. we found a suitable seek point... */
3067                         new_lower_bound = first_frame_offset + seek_table->points[i].stream_offset;
3068                         new_lower_bound_sample = seek_table->points[i].sample_number;
3069                 }
3070
3071                 /* find the closest seek point > target_sample, if it exists */
3072                 for(i = 0; i < (int)seek_table->num_points; i++) {
3073                         if(
3074                                 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
3075                                 seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */
3076                                 (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */
3077                                 seek_table->points[i].sample_number > target_sample
3078                         )
3079                                 break;
3080                 }
3081                 if(i < (int)seek_table->num_points) { /* i.e. we found a suitable seek point... */
3082                         new_upper_bound = first_frame_offset + seek_table->points[i].stream_offset;
3083                         new_upper_bound_sample = seek_table->points[i].sample_number;
3084                 }
3085                 /* final protection against unsorted seek tables; keep original values if bogus */
3086                 if(new_upper_bound >= new_lower_bound) {
3087                         lower_bound = new_lower_bound;
3088                         upper_bound = new_upper_bound;
3089                         lower_bound_sample = new_lower_bound_sample;
3090                         upper_bound_sample = new_upper_bound_sample;
3091                 }
3092         }
3093
3094         FLAC__ASSERT(upper_bound_sample >= lower_bound_sample);
3095         /* there are 2 insidious ways that the following equality occurs, which
3096          * we need to fix:
3097          *  1) total_samples is 0 (unknown) and target_sample is 0
3098          *  2) total_samples is 0 (unknown) and target_sample happens to be
3099          *     exactly equal to the last seek point in the seek table; this
3100          *     means there is no seek point above it, and upper_bound_samples
3101          *     remains equal to the estimate (of target_samples) we made above
3102          * in either case it does not hurt to move upper_bound_sample up by 1
3103          */
3104         if(upper_bound_sample == lower_bound_sample)
3105                 upper_bound_sample++;
3106
3107         decoder->private_->target_sample = target_sample;
3108         while(1) {
3109                 /* check if the bounds are still ok */
3110                 if (lower_bound_sample >= upper_bound_sample || lower_bound > upper_bound) {
3111                         decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3112                         return false;
3113                 }
3114 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3115                 pos = (FLAC__int64)lower_bound + (FLAC__int64)((double)(target_sample - lower_bound_sample) / (double)(upper_bound_sample - lower_bound_sample) * (double)(upper_bound - lower_bound)) - approx_bytes_per_frame;
3116 #else
3117                 /* a little less accurate: */
3118                 if(upper_bound - lower_bound < 0xffffffff)
3119                         pos = (FLAC__int64)lower_bound + (FLAC__int64)(((target_sample - lower_bound_sample) * (upper_bound - lower_bound)) / (upper_bound_sample - lower_bound_sample)) - approx_bytes_per_frame;
3120                 else /* @@@ WATCHOUT, ~2TB limit */
3121                         pos = (FLAC__int64)lower_bound + (FLAC__int64)((((target_sample - lower_bound_sample)>>8) * ((upper_bound - lower_bound)>>8)) / ((upper_bound_sample - lower_bound_sample)>>16)) - approx_bytes_per_frame;
3122 #endif
3123                 if(pos >= (FLAC__int64)upper_bound)
3124                         pos = (FLAC__int64)upper_bound - 1;
3125                 if(pos < (FLAC__int64)lower_bound)
3126                         pos = (FLAC__int64)lower_bound;
3127                 if(decoder->private_->seek_callback(decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) {
3128                         decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3129                         return false;
3130                 }
3131                 if(!FLAC__stream_decoder_flush(decoder)) {
3132                         /* above call sets the state for us */
3133                         return false;
3134                 }
3135                 /* Now we need to get a frame.  First we need to reset our
3136                  * unparseable_frame_count; if we get too many unparseable
3137                  * frames in a row, the read callback will return
3138                  * FLAC__STREAM_DECODER_READ_STATUS_ABORT, causing
3139                  * FLAC__stream_decoder_process_single() to return false.
3140                  */
3141                 decoder->private_->unparseable_frame_count = 0;
3142                 if(!FLAC__stream_decoder_process_single(decoder) ||
3143                    decoder->protected_->state == FLAC__STREAM_DECODER_ABORTED) {
3144                         decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3145                         return false;
3146                 }
3147                 /* our write callback will change the state when it gets to the target frame */
3148                 /* actually, we could have got_a_frame if our decoder is at FLAC__STREAM_DECODER_END_OF_STREAM so we need to check for that also */
3149 #if 0
3150                 /*@@@@@@ used to be the following; not clear if the check for end of stream is needed anymore */
3151                 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING && decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM)
3152                         break;
3153 #endif
3154                 if(!decoder->private_->is_seeking)
3155                         break;
3156
3157                 FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
3158                 this_frame_sample = decoder->private_->last_frame.header.number.sample_number;
3159
3160                 if (0 == decoder->private_->samples_decoded || (this_frame_sample + decoder->private_->last_frame.header.blocksize >= upper_bound_sample && !first_seek)) {
3161                         if (pos == (FLAC__int64)lower_bound) {
3162                                 /* can't move back any more than the first frame, something is fatally wrong */
3163                                 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3164                                 return false;
3165                         }
3166                         /* our last move backwards wasn't big enough, try again */
3167                         approx_bytes_per_frame = approx_bytes_per_frame? approx_bytes_per_frame * 2 : 16;
3168                         continue;
3169                 }
3170                 /* allow one seek over upper bound, so we can get a correct upper_bound_sample for streams with unknown total_samples */
3171                 first_seek = false;
3172
3173                 /* make sure we are not seeking in corrupted stream */
3174                 if (this_frame_sample < lower_bound_sample) {
3175                         decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3176                         return false;
3177                 }
3178
3179                 /* we need to narrow the search */
3180                 if(target_sample < this_frame_sample) {
3181                         upper_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize;
3182 /*@@@@@@ what will decode position be if at end of stream? */
3183                         if(!FLAC__stream_decoder_get_decode_position(decoder, &upper_bound)) {
3184                                 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3185                                 return false;
3186                         }
3187                         approx_bytes_per_frame = (uint32_t)(2 * (upper_bound - pos) / 3 + 16);
3188                 }
3189                 else { /* target_sample >= this_frame_sample + this frame's blocksize */
3190                         lower_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize;
3191                         if(!FLAC__stream_decoder_get_decode_position(decoder, &lower_bound)) {
3192                                 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3193                                 return false;
3194                         }
3195                         approx_bytes_per_frame = (uint32_t)(2 * (lower_bound - pos) / 3 + 16);
3196                 }
3197         }
3198
3199         return true;
3200 }
3201
3202 #if FLAC__HAS_OGG
3203 FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample)
3204 {
3205         FLAC__uint64 left_pos = 0, right_pos = stream_length;
3206         FLAC__uint64 left_sample = 0, right_sample = FLAC__stream_decoder_get_total_samples(decoder);
3207         FLAC__uint64 this_frame_sample = (FLAC__uint64)0 - 1;
3208         FLAC__uint64 pos = 0; /* only initialized to avoid compiler warning */
3209         FLAC__bool did_a_seek;
3210         uint32_t iteration = 0;
3211
3212         /* In the first iterations, we will calculate the target byte position
3213          * by the distance from the target sample to left_sample and
3214          * right_sample (let's call it "proportional search").  After that, we
3215          * will switch to binary search.
3216          */
3217         uint32_t BINARY_SEARCH_AFTER_ITERATION = 2;
3218
3219         /* We will switch to a linear search once our current sample is less
3220          * than this number of samples ahead of the target sample
3221          */
3222         static const FLAC__uint64 LINEAR_SEARCH_WITHIN_SAMPLES = FLAC__MAX_BLOCK_SIZE * 2;
3223
3224         /* If the total number of samples is unknown, use a large value, and
3225          * force binary search immediately.
3226          */
3227         if(right_sample == 0) {
3228                 right_sample = (FLAC__uint64)(-1);
3229                 BINARY_SEARCH_AFTER_ITERATION = 0;
3230         }
3231
3232         decoder->private_->target_sample = target_sample;
3233         for( ; ; iteration++) {
3234                 if (iteration == 0 || this_frame_sample > target_sample || target_sample - this_frame_sample > LINEAR_SEARCH_WITHIN_SAMPLES) {
3235                         if (iteration >= BINARY_SEARCH_AFTER_ITERATION) {
3236                                 pos = (right_pos + left_pos) / 2;
3237                         }
3238                         else {
3239 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3240                                 pos = (FLAC__uint64)((double)(target_sample - left_sample) / (double)(right_sample - left_sample) * (double)(right_pos - left_pos));
3241 #else
3242                                 /* a little less accurate: */
3243                                 if ((target_sample-left_sample <= 0xffffffff) && (right_pos-left_pos <= 0xffffffff))
3244                                         pos = (FLAC__int64)(((target_sample-left_sample) * (right_pos-left_pos)) / (right_sample-left_sample));
3245                                 else /* @@@ WATCHOUT, ~2TB limit */
3246                                         pos = (FLAC__int64)((((target_sample-left_sample)>>8) * ((right_pos-left_pos)>>8)) / ((right_sample-left_sample)>>16));
3247 #endif
3248                                 /* @@@ TODO: might want to limit pos to some distance
3249                                  * before EOF, to make sure we land before the last frame,
3250                                  * thereby getting a this_frame_sample and so having a better
3251                                  * estimate.
3252                                  */
3253                         }
3254
3255                         /* physical seek */
3256                         if(decoder->private_->seek_callback((FLAC__StreamDecoder*)decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) {
3257                                 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3258                                 return false;
3259                         }
3260                         if(!FLAC__stream_decoder_flush(decoder)) {
3261                                 /* above call sets the state for us */
3262                                 return false;
3263                         }
3264                         did_a_seek = true;
3265                 }
3266                 else
3267                         did_a_seek = false;
3268
3269                 decoder->private_->got_a_frame = false;
3270                 if(!FLAC__stream_decoder_process_single(decoder) ||
3271                    decoder->protected_->state == FLAC__STREAM_DECODER_ABORTED) {
3272                         decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3273                         return false;
3274                 }
3275                 if(!decoder->private_->got_a_frame) {
3276                         if(did_a_seek) {
3277                                 /* this can happen if we seek to a point after the last frame; we drop
3278                                  * to binary search right away in this case to avoid any wasted
3279                                  * iterations of proportional search.
3280                                  */
3281                                 right_pos = pos;
3282                                 BINARY_SEARCH_AFTER_ITERATION = 0;
3283                         }
3284                         else {
3285                                 /* this can probably only happen if total_samples is unknown and the
3286                                  * target_sample is past the end of the stream
3287                                  */
3288                                 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3289                                 return false;
3290                         }
3291                 }
3292                 /* our write callback will change the state when it gets to the target frame */
3293                 else if(!decoder->private_->is_seeking) {
3294                         break;
3295                 }
3296                 else {
3297                         this_frame_sample = decoder->private_->last_frame.header.number.sample_number;
3298                         FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
3299
3300                         if (did_a_seek) {
3301                                 if (this_frame_sample <= target_sample) {
3302                                         /* The 'equal' case should not happen, since
3303                                          * FLAC__stream_decoder_process_single()
3304                                          * should recognize that it has hit the
3305                                          * target sample and we would exit through
3306                                          * the 'break' above.
3307                                          */
3308                                         FLAC__ASSERT(this_frame_sample != target_sample);
3309
3310                                         left_sample = this_frame_sample;
3311                                         /* sanity check to avoid infinite loop */
3312                                         if (left_pos == pos) {
3313                                                 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3314                                                 return false;
3315                                         }
3316                                         left_pos = pos;
3317                                 }
3318                                 else if(this_frame_sample > target_sample) {
3319                                         right_sample = this_frame_sample;
3320                                         /* sanity check to avoid infinite loop */
3321                                         if (right_pos == pos) {
3322                                                 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3323                                                 return false;
3324                                         }
3325                                         right_pos = pos;
3326                                 }
3327                         }
3328                 }
3329         }
3330
3331         return true;
3332 }
3333 #endif
3334
3335 FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
3336 {
3337         (void)client_data;
3338
3339         if(*bytes > 0) {
3340                 *bytes = fread(buffer, sizeof(FLAC__byte), *bytes, decoder->private_->file);
3341                 if(ferror(decoder->private_->file))
3342                         return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
3343                 else if(*bytes == 0)
3344                         return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
3345                 else
3346                         return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
3347         }
3348         else
3349                 return FLAC__STREAM_DECODER_READ_STATUS_ABORT; /* abort to avoid a deadlock */
3350 }
3351
3352 FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data)
3353 {
3354         (void)client_data;
3355
3356         if(decoder->private_->file == stdin)
3357                 return FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED;
3358         else if(fseeko(decoder->private_->file, (FLAC__off_t)absolute_byte_offset, SEEK_SET) < 0)
3359                 return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;
3360         else
3361                 return FLAC__STREAM_DECODER_SEEK_STATUS_OK;
3362 }
3363
3364 FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data)
3365 {
3366         FLAC__off_t pos;
3367         (void)client_data;
3368
3369         if(decoder->private_->file == stdin)
3370                 return FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED;
3371         else if((pos = ftello(decoder->private_->file)) < 0)
3372                 return FLAC__STREAM_DECODER_TELL_STATUS_ERROR;
3373         else {
3374                 *absolute_byte_offset = (FLAC__uint64)pos;
3375                 return FLAC__STREAM_DECODER_TELL_STATUS_OK;
3376         }
3377 }
3378
3379 FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data)
3380 {
3381         struct flac_stat_s filestats;
3382         (void)client_data;
3383
3384         if(decoder->private_->file == stdin)
3385                 return FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED;
3386         else if(flac_fstat(fileno(decoder->private_->file), &filestats) != 0)
3387                 return FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR;
3388         else {
3389                 *stream_length = (FLAC__uint64)filestats.st_size;
3390                 return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
3391         }
3392 }
3393
3394 FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data)
3395 {
3396         (void)client_data;
3397
3398         return feof(decoder->private_->file)? true : false;
3399 }
3400
3401 void *get_client_data_from_decoder(FLAC__StreamDecoder *decoder)
3402 {
3403         return decoder->private_->client_data;
3404 }