/*
-Minetest-c55
-Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+GNU Lesser General Public License for more details.
-You should have received a copy of the GNU General Public License along
+You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "serialization.h"
-#include "utility.h"
-#ifdef _WIN32
- #define ZLIB_WINAPI
-#endif
-#include "zlib.h"
+
+#include "util/serialize.h"
+
+#include <zlib.h>
+#include <zstd.h>
/* report a zlib or i/o error */
void zerr(int ret)
-{
+{
dstream<<"zerr: ";
switch (ret) {
case Z_ERRNO:
}
}
-void compressZlib(SharedBuffer<u8> data, std::ostream &os)
+void compressZlib(const u8 *data, size_t data_size, std::ostream &os, int level)
{
z_stream z;
const s32 bufsize = 16384;
- //char input_buffer[bufsize];
char output_buffer[bufsize];
- int input_i = 0;
int status = 0;
int ret;
z.zfree = Z_NULL;
z.opaque = Z_NULL;
- ret = deflateInit(&z, -1);
+ ret = deflateInit(&z, level);
if(ret != Z_OK)
throw SerializationError("compressZlib: deflateInit failed");
-
- z.avail_in = 0;
-
+
+ // Point zlib to our input buffer
+ z.next_in = (Bytef*)&data[0];
+ z.avail_in = data_size;
+ // And get all output
for(;;)
{
- int flush = Z_NO_FLUSH;
z.next_out = (Bytef*)output_buffer;
z.avail_out = bufsize;
- if(z.avail_in == 0)
- {
- //z.next_in = (char*)&data[input_i];
- z.next_in = (Bytef*)&data[input_i];
- z.avail_in = data.getSize() - input_i;
- input_i += z.avail_in;
- if(input_i == (int)data.getSize())
- flush = Z_FINISH;
- }
- if(z.avail_in == 0)
- break;
- status = deflate(&z, flush);
+ status = deflate(&z, Z_FINISH);
if(status == Z_NEED_DICT || status == Z_DATA_ERROR
|| status == Z_MEM_ERROR)
{
int count = bufsize - z.avail_out;
if(count)
os.write(output_buffer, count);
+ // This determines zlib has given all output
+ if(status == Z_STREAM_END)
+ break;
}
deflateEnd(&z);
-
}
-void compressZlib(const std::string &data, std::ostream &os)
+void compressZlib(const std::string &data, std::ostream &os, int level)
{
- SharedBuffer<u8> databuf((u8*)data.c_str(), data.size());
- compressZlib(databuf, os);
+ compressZlib((u8*)data.c_str(), data.size(), os, level);
}
-void decompressZlib(std::istream &is, std::ostream &os)
+void decompressZlib(std::istream &is, std::ostream &os, size_t limit)
{
z_stream z;
const s32 bufsize = 16384;
char output_buffer[bufsize];
int status = 0;
int ret;
- int bytes_read = 0;
+ int bytes_written = 0;
int input_buffer_len = 0;
z.zalloc = Z_NULL;
ret = inflateInit(&z);
if(ret != Z_OK)
throw SerializationError("dcompressZlib: inflateInit failed");
-
+
z.avail_in = 0;
-
- //dstream<<"initial fail="<<is.fail()<<" bad="<<is.bad()<<std::endl;
for(;;)
{
+ int output_size = bufsize;
z.next_out = (Bytef*)output_buffer;
- z.avail_out = bufsize;
+ z.avail_out = output_size;
+
+ if (limit) {
+ int limit_remaining = limit - bytes_written;
+ if (limit_remaining <= 0) {
+ // we're aborting ahead of time - throw an error?
+ break;
+ }
+ if (limit_remaining < output_size) {
+ z.avail_out = output_size = limit_remaining;
+ }
+ }
if(z.avail_in == 0)
{
z.next_in = (Bytef*)input_buffer;
- input_buffer_len = is.readsome(input_buffer, bufsize);
+ is.read(input_buffer, bufsize);
+ input_buffer_len = is.gcount();
z.avail_in = input_buffer_len;
- //dstream<<"read fail="<<is.fail()<<" bad="<<is.bad()<<std::endl;
}
if(z.avail_in == 0)
{
- //dstream<<"z.avail_in == 0"<<std::endl;
break;
}
-
- //dstream<<"1 z.avail_in="<<z.avail_in<<std::endl;
+
status = inflate(&z, Z_NO_FLUSH);
- //dstream<<"2 z.avail_in="<<z.avail_in<<std::endl;
- bytes_read += is.gcount() - z.avail_in;
- //dstream<<"bytes_read="<<bytes_read<<std::endl;
if(status == Z_NEED_DICT || status == Z_DATA_ERROR
|| status == Z_MEM_ERROR)
zerr(status);
throw SerializationError("decompressZlib: inflate failed");
}
- int count = bufsize - z.avail_out;
- //dstream<<"count="<<count<<std::endl;
+ int count = output_size - z.avail_out;
if(count)
os.write(output_buffer, count);
+ bytes_written += count;
if(status == Z_STREAM_END)
{
- //dstream<<"Z_STREAM_END"<<std::endl;
-
- //dstream<<"z.avail_in="<<z.avail_in<<std::endl;
- //dstream<<"fail="<<is.fail()<<" bad="<<is.bad()<<std::endl;
// Unget all the data that inflate didn't take
+ is.clear(); // Just in case EOF is set
for(u32 i=0; i < z.avail_in; i++)
{
is.unget();
throw SerializationError("decompressZlib: unget failed");
}
}
-
+
break;
}
}
inflateEnd(&z);
}
-void compress(SharedBuffer<u8> data, std::ostream &os, u8 version)
+struct ZSTD_Deleter {
+ void operator() (ZSTD_CStream* cstream) {
+ ZSTD_freeCStream(cstream);
+ }
+
+ void operator() (ZSTD_DStream* dstream) {
+ ZSTD_freeDStream(dstream);
+ }
+};
+
+void compressZstd(const u8 *data, size_t data_size, std::ostream &os, int level)
{
+ // reusing the context is recommended for performance
+ // it will be destroyed when the thread ends
+ thread_local std::unique_ptr<ZSTD_CStream, ZSTD_Deleter> stream(ZSTD_createCStream());
+
+
+ ZSTD_initCStream(stream.get(), level);
+
+ const size_t bufsize = 16384;
+ char output_buffer[bufsize];
+
+ ZSTD_inBuffer input = { data, data_size, 0 };
+ ZSTD_outBuffer output = { output_buffer, bufsize, 0 };
+
+ while (input.pos < input.size) {
+ size_t ret = ZSTD_compressStream(stream.get(), &output, &input);
+ if (ZSTD_isError(ret)) {
+ dstream << ZSTD_getErrorName(ret) << std::endl;
+ throw SerializationError("compressZstd: failed");
+ }
+ if (output.pos) {
+ os.write(output_buffer, output.pos);
+ output.pos = 0;
+ }
+ }
+
+ size_t ret;
+ do {
+ ret = ZSTD_endStream(stream.get(), &output);
+ if (ZSTD_isError(ret)) {
+ dstream << ZSTD_getErrorName(ret) << std::endl;
+ throw SerializationError("compressZstd: failed");
+ }
+ if (output.pos) {
+ os.write(output_buffer, output.pos);
+ output.pos = 0;
+ }
+ } while (ret != 0);
+
+}
+
+void compressZstd(const std::string &data, std::ostream &os, int level)
+{
+ compressZstd((u8*)data.c_str(), data.size(), os, level);
+}
+
+void decompressZstd(std::istream &is, std::ostream &os)
+{
+ // reusing the context is recommended for performance
+ // it will be destroyed when the thread ends
+ thread_local std::unique_ptr<ZSTD_DStream, ZSTD_Deleter> stream(ZSTD_createDStream());
+
+ ZSTD_initDStream(stream.get());
+
+ const size_t bufsize = 16384;
+ char output_buffer[bufsize];
+ char input_buffer[bufsize];
+
+ ZSTD_outBuffer output = { output_buffer, bufsize, 0 };
+ ZSTD_inBuffer input = { input_buffer, 0, 0 };
+ size_t ret;
+ do
+ {
+ if (input.size == input.pos) {
+ is.read(input_buffer, bufsize);
+ input.size = is.gcount();
+ input.pos = 0;
+ }
+
+ ret = ZSTD_decompressStream(stream.get(), &output, &input);
+ if (ZSTD_isError(ret)) {
+ dstream << ZSTD_getErrorName(ret) << std::endl;
+ throw SerializationError("decompressZstd: failed");
+ }
+ if (output.pos) {
+ os.write(output_buffer, output.pos);
+ output.pos = 0;
+ }
+ } while (ret != 0);
+
+ // Unget all the data that ZSTD_decompressStream didn't take
+ is.clear(); // Just in case EOF is set
+ for (u32 i = 0; i < input.size - input.pos; i++) {
+ is.unget();
+ if (is.fail() || is.bad())
+ throw SerializationError("decompressZstd: unget failed");
+ }
+}
+
+void compress(u8 *data, u32 size, std::ostream &os, u8 version, int level)
+{
+ if(version >= 29)
+ {
+ // map the zlib levels [0,9] to [1,10]. -1 becomes 0 which indicates the default (currently 3)
+ compressZstd(data, size, os, level + 1);
+ return;
+ }
+
if(version >= 11)
{
- compressZlib(data, os);
+ compressZlib(data, size, os, level);
return;
}
- if(data.getSize() == 0)
+ if(size == 0)
return;
-
+
// Write length (u32)
u8 tmp[4];
- writeU32(tmp, data.getSize());
+ writeU32(tmp, size);
os.write((char*)tmp, 4);
-
+
// We will be writing 8-bit pairs of more_count and byte
u8 more_count = 0;
u8 current_byte = data[0];
- for(u32 i=1; i<data.getSize(); i++)
+ for(u32 i=1; i<size; i++)
{
if(
data[i] != current_byte
os.write((char*)¤t_byte, 1);
}
+void compress(const SharedBuffer<u8> &data, std::ostream &os, u8 version, int level)
+{
+ compress(*data, data.getSize(), os, version, level);
+}
+
+void compress(const std::string &data, std::ostream &os, u8 version, int level)
+{
+ compress((u8*)data.c_str(), data.size(), os, version, level);
+}
+
void decompress(std::istream &is, std::ostream &os, u8 version)
{
+ if(version >= 29)
+ {
+ decompressZstd(is, os);
+ return;
+ }
+
if(version >= 11)
{
decompressZlib(is, os);
u8 tmp[4];
is.read((char*)tmp, 4);
u32 len = readU32(tmp);
-
+
// We will be reading 8-bit pairs of more_count and byte
u32 count = 0;
for(;;)
u8 byte=0;
is.read((char*)&more_count, 1);
-
+
is.read((char*)&byte, 1);
if(is.eof())
projects / dragonfireclient.git / blobdiff