zlib/gzguts.h

   1 /* gzguts.h -- zlib internal header definitions for gz* operations
   2  * Copyright (C) 2004, 2005, 2010, 2011, 2012 Mark Adler
   3  * For conditions of distribution and use, see copyright notice in zlib.h
   4  */
   5
   6 #ifdef _LARGEFILE64_SOURCE
   7 #  ifndef _LARGEFILE_SOURCE
   8 #    define _LARGEFILE_SOURCE 1
   9 #  endif
  10 #  ifdef _FILE_OFFSET_BITS
  11 #    undef _FILE_OFFSET_BITS
  12 #  endif
  13 #endif
  14
  15 #ifdef HAVE_HIDDEN
  16 #  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
  17 #else
  18 #  define ZLIB_INTERNAL
  19 #endif
  20
  21 #include <stdio.h>
  22 #include "zlib.h"
  23 #ifdef STDC
  24 #  include <string.h>
  25 #  include <stdlib.h>
  26 #  include <limits.h>
  27 #endif
  28 #include <fcntl.h>
  29
  30 #ifdef _WIN32
  31 #  include <stddef.h>
  32 #endif
  33
  34 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
  35 #  include <io.h>
  36 #endif
  37
  38 #ifdef NO_DEFLATE       /* for compatibility with old definition */
  39 #  define NO_GZCOMPRESS
  40 #endif
  41
  42 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
  43 #  ifndef HAVE_VSNPRINTF
  44 #    define HAVE_VSNPRINTF
  45 #  endif
  46 #endif
  47
  48 #if defined(__CYGWIN__)
  49 #  ifndef HAVE_VSNPRINTF
  50 #    define HAVE_VSNPRINTF
  51 #  endif
  52 #endif
  53
  54 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
  55 #  ifndef HAVE_VSNPRINTF
  56 #    define HAVE_VSNPRINTF
  57 #  endif
  58 #endif
  59
  60 #ifndef HAVE_VSNPRINTF
  61 #  ifdef MSDOS
  62 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
  63  but for now we just assume it doesn't. */
  64 #    define NO_vsnprintf
  65 #  endif
  66 #  ifdef __TURBOC__
  67 #    define NO_vsnprintf
  68 #  endif
  69 #  ifdef WIN32
  70 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
  71 #    if !defined(vsnprintf) && !defined(NO_vsnprintf)
  72 #      if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
  73 #         define vsnprintf _vsnprintf
  74 #      endif
  75 #    endif
  76 #  endif
  77 #  ifdef __SASC
  78 #    define NO_vsnprintf
  79 #  endif
  80 #  ifdef VMS
  81 #    define NO_vsnprintf
  82 #  endif
  83 #  ifdef __OS400__
  84 #    define NO_vsnprintf
  85 #  endif
  86 #  ifdef __MVS__
  87 #    define NO_vsnprintf
  88 #  endif
  89 #endif
  90
  91 #ifndef local
  92 #  define local static
  93 #endif
  94 /* compile with -Dlocal if your debugger can't find static symbols */
  95
  96 /* gz* functions always use library allocation functions */
  97 #ifndef STDC
  98   extern voidp  malloc OF((uInt size));
  99   extern void   free   OF((voidpf ptr));
 100 #endif
 101
 102 /* get errno and strerror definition */
 103 #if defined UNDER_CE
 104 #  include <windows.h>
 105 #  define zstrerror() gz_strwinerror((DWORD)GetLastError())
 106 #else
 107 #  ifndef NO_STRERROR
 108 #    include <errno.h>
 109 #    define zstrerror() strerror(errno)
 110 #  else
 111 #    define zstrerror() "stdio error (consult errno)"
 112 #  endif
 113 #endif
 114
 115 /* provide prototypes for these when building zlib without LFS */
 116 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
 117     ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
 118     ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
 119     ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
 120     ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
 121 #endif
 122
 123 /* default memLevel */
 124 #if MAX_MEM_LEVEL >= 8
 125 #  define DEF_MEM_LEVEL 8
 126 #else
 127 #  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
 128 #endif
 129
 130 /* default i/o buffer size -- double this for output when reading */
 131 #define GZBUFSIZE 8192
 132
 133 /* gzip modes, also provide a little integrity check on the passed structure */
 134 #define GZ_NONE 0
 135 #define GZ_READ 7247
 136 #define GZ_WRITE 31153
 137 #define GZ_APPEND 1     /* mode set to GZ_WRITE after the file is opened */
 138
 139 /* values for gz_state how */
 140 #define LOOK 0      /* look for a gzip header */
 141 #define COPY 1      /* copy input directly */
 142 #define GZIP 2      /* decompress a gzip stream */
 143
 144 /* internal gzip file state data structure */
 145 typedef struct {
 146         /* exposed contents for gzgetc() macro */
 147     struct gzFile_s x;      /* "x" for exposed */
 148                             /* x.have: number of bytes available at x.next */
 149                             /* x.next: next output data to deliver or write */
 150                             /* x.pos: current position in uncompressed data */
 151         /* used for both reading and writing */
 152     int mode;               /* see gzip modes above */
 153     int fd;                 /* file descriptor */
 154     char *path;             /* path or fd for error messages */
 155     unsigned size;          /* buffer size, zero if not allocated yet */
 156     unsigned want;          /* requested buffer size, default is GZBUFSIZE */
 157     unsigned char *in;      /* input buffer */
 158     unsigned char *out;     /* output buffer (double-sized when reading) */
 159     int direct;             /* 0 if processing gzip, 1 if transparent */
 160         /* just for reading */
 161     int how;                /* 0: get header, 1: copy, 2: decompress */
 162     z_off64_t start;        /* where the gzip data started, for rewinding */
 163     int eof;                /* true if end of input file reached */
 164     int past;               /* true if read requested past end */
 165         /* just for writing */
 166     int level;              /* compression level */
 167     int strategy;           /* compression strategy */
 168         /* seek request */
 169     z_off64_t skip;         /* amount to skip (already rewound if backwards) */
 170     int seek;               /* true if seek request pending */
 171         /* error information */
 172     int err;                /* error code */
 173     char *msg;              /* error message */
 174         /* zlib inflate or deflate stream */
 175     z_stream strm;          /* stream structure in-place (not a pointer) */
 176 } gz_state;
 177 typedef gz_state FAR *gz_statep;
 178
 179 /* shared functions */
 180 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
 181 #if defined UNDER_CE
 182 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
 183 #endif
 184
 185 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
 186    value -- needed when comparing unsigned to z_off64_t, which is signed
 187    (possible z_off64_t types off_t, off64_t, and long are all signed) */
 188 #ifdef INT_MAX
 189 #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
 190 #else
 191 unsigned ZLIB_INTERNAL gz_intmax OF((void));
 192 #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
 193 #endif