1 /* gzguts.h -- zlib internal header definitions for gz* operations
2 * Copyright (C) 2004, 2005, 2010 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h
6 #if _LARGEFILE64_SOURCE
7 # ifndef _LARGEFILE_SOURCE
8 # define _LARGEFILE_SOURCE 1
10 # ifdef _FILE_OFFSET_BITS
11 # undef _FILE_OFFSET_BITS
26 #ifdef NO_DEFLATE /* for compatibility with old definition */
27 # define NO_GZCOMPRESS
32 # define vsnprintf _vsnprintf
38 /* compile with -Dlocal if your debugger can't find static symbols */
40 /* gz* functions always use library allocation functions */
42 extern voidp malloc OF((uInt size));
43 extern void free OF((voidpf ptr));
46 /* get errno and strerror definition */
49 # define zstrerror() gz_strwinerror((DWORD)GetLastError())
53 # define zstrerror() strerror(errno)
55 # define zstrerror() "stdio error (consult errno)"
59 #if _LARGEFILE64_SOURCE
60 # define z_off64_t off64_t
62 # define z_off64_t z_off_t
65 /* provide prototypes for these when building zlib without LFS */
66 #if _LARGEFILE64_SOURCE+0 != 1 || _LFS64_LARGEFILE+0 != 1
67 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
68 ZEXTERN z_off_t ZEXPORT gzseek64 OF((gzFile, off_t, int));
69 ZEXTERN z_off_t ZEXPORT gztell64 OF((gzFile));
70 ZEXTERN z_off_t ZEXPORT gzoffset64 OF((gzFile));
73 /* default i/o buffer size -- double this for output when reading */
74 #define GZBUFSIZE 8192
76 /* gzip modes, also provide a little integrity check on the passed structure */
79 #define GZ_WRITE 31153
80 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */
82 /* values for gz_state how */
83 #define LOOK 0 /* look for a gzip header */
84 #define COPY 1 /* copy input directly */
85 #define GZIP 2 /* decompress a gzip stream */
87 /* internal gzip file state data structure */
89 /* used for both reading and writing */
90 int mode; /* see gzip modes above */
91 int fd; /* file descriptor */
92 char *path; /* path or fd for error messages */
93 z_off64_t pos; /* current position in uncompressed data */
94 unsigned size; /* buffer size, zero if not allocated yet */
95 unsigned want; /* requested buffer size, default is GZBUFSIZE */
96 unsigned char *in; /* input buffer */
97 unsigned char *out; /* output buffer (double-sized when reading) */
98 unsigned char *next; /* next output data to deliver or write */
99 /* just for reading */
100 unsigned have; /* amount of output data unused at next */
101 int eof; /* true if end of input file reached */
102 z_off64_t start; /* where the gzip data started, for rewinding */
103 z_off64_t raw; /* where the raw data started, for seeking */
104 int how; /* 0: get header, 1: copy, 2: decompress */
105 int direct; /* true if last read direct, false if gzip */
106 /* just for writing */
107 int level; /* compression level */
108 int strategy; /* compression strategy */
110 z_off64_t skip; /* amount to skip (already rewound if backwards) */
111 int seek; /* true if seek request pending */
112 /* error information */
113 int err; /* error code */
114 char *msg; /* error message */
115 /* zlib inflate or deflate stream */
116 z_stream strm; /* stream structure in-place (not a pointer) */
118 typedef gz_state FAR *gz_statep;
120 /* shared functions */
121 ZEXTERN void ZEXPORT gz_error OF((gz_statep, int, const char *));
123 ZEXTERN char ZEXPORT *gz_strwinerror OF((DWORD error));
126 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
127 value -- needed when comparing unsigned to z_off64_t, which is signed
128 (possible z_off64_t types off_t, off64_t, and long are all signed) */
130 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
132 ZEXTERN unsigned ZEXPORT gz_intmax OF((void));
133 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())