ceph/src/zstd/zlibWrapper/gzguts.h

   1 /* gzguts.h contains minimal changes required to be compiled with zlibWrapper:
   2  * - #include "zlib.h" was changed to #include "zstd_zlibwrapper.h"
   3  * - gz_statep was converted to union to work with -Wstrict-aliasing=1      */
   4
   5 /* gzguts.h -- zlib internal header definitions for gz* operations
   6  * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler
   7  * For conditions of distribution and use, see http://www.zlib.net/zlib_license.html
   8  */
   9
  10 #ifdef _LARGEFILE64_SOURCE
  11 #  ifndef _LARGEFILE_SOURCE
  12 #    define _LARGEFILE_SOURCE 1
  13 #  endif
  14 #  ifdef _FILE_OFFSET_BITS
  15 #    undef _FILE_OFFSET_BITS
  16 #  endif
  17 #endif
  18
  19 #ifdef HAVE_HIDDEN
  20 #  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
  21 #else
  22 #  define ZLIB_INTERNAL
  23 #endif
  24
  25 #include <stdio.h>
  26 #include "zstd_zlibwrapper.h"
  27 #include "gzcompatibility.h"
  28 #ifdef STDC
  29 #  include <string.h>
  30 #  include <stdlib.h>
  31 #  include <limits.h>
  32 #endif
  33
  34 #ifndef _POSIX_SOURCE
  35 #  define _POSIX_SOURCE
  36 #endif
  37 #include <fcntl.h>
  38
  39 #ifdef _WIN32
  40 #  include <stddef.h>
  41 #endif
  42
  43 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
  44 #  include <io.h>
  45 #endif
  46
  47 #if defined(_WIN32) || defined(__CYGWIN__)
  48 #  define WIDECHAR
  49 #endif
  50
  51 #ifdef WINAPI_FAMILY
  52 #  define open _open
  53 #  define read _read
  54 #  define write _write
  55 #  define close _close
  56 #endif
  57
  58 #ifdef NO_DEFLATE       /* for compatibility with old definition */
  59 #  define NO_GZCOMPRESS
  60 #endif
  61
  62 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
  63 #  ifndef HAVE_VSNPRINTF
  64 #    define HAVE_VSNPRINTF
  65 #  endif
  66 #endif
  67
  68 #if defined(__CYGWIN__)
  69 #  ifndef HAVE_VSNPRINTF
  70 #    define HAVE_VSNPRINTF
  71 #  endif
  72 #endif
  73
  74 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
  75 #  ifndef HAVE_VSNPRINTF
  76 #    define HAVE_VSNPRINTF
  77 #  endif
  78 #endif
  79
  80 #ifndef HAVE_VSNPRINTF
  81 #  ifdef MSDOS
  82 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
  83    but for now we just assume it doesn't. */
  84 #    define NO_vsnprintf
  85 #  endif
  86 #  ifdef __TURBOC__
  87 #    define NO_vsnprintf
  88 #  endif
  89 #  ifdef WIN32
  90 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
  91 #    if !defined(vsnprintf) && !defined(NO_vsnprintf)
  92 #      if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
  93 #         define vsnprintf _vsnprintf
  94 #      endif
  95 #    endif
  96 #  endif
  97 #  ifdef __SASC
  98 #    define NO_vsnprintf
  99 #  endif
 100 #  ifdef VMS
 101 #    define NO_vsnprintf
 102 #  endif
 103 #  ifdef __OS400__
 104 #    define NO_vsnprintf
 105 #  endif
 106 #  ifdef __MVS__
 107 #    define NO_vsnprintf
 108 #  endif
 109 #endif
 110
 111 /* unlike snprintf (which is required in C99), _snprintf does not guarantee
 112    null termination of the result -- however this is only used in gzlib.c where
 113    the result is assured to fit in the space provided */
 114 #if defined(_MSC_VER) && _MSC_VER < 1900
 115 #  define snprintf _snprintf
 116 #endif
 117
 118 #ifndef local
 119 #  define local static
 120 #endif
 121 /* since "static" is used to mean two completely different things in C, we
 122    define "local" for the non-static meaning of "static", for readability
 123    (compile with -Dlocal if your debugger can't find static symbols) */
 124
 125 /* gz* functions always use library allocation functions */
 126 #ifndef STDC
 127   extern voidp  malloc OF((uInt size));
 128   extern void   free   OF((voidpf ptr));
 129 #endif
 130
 131 /* get errno and strerror definition */
 132 #if defined UNDER_CE
 133 #  include <windows.h>
 134 #  define zstrerror() gz_strwinerror((DWORD)GetLastError())
 135 #else
 136 #  ifndef NO_STRERROR
 137 #    include <errno.h>
 138 #    define zstrerror() strerror(errno)
 139 #  else
 140 #    define zstrerror() "stdio error (consult errno)"
 141 #  endif
 142 #endif
 143
 144 /* provide prototypes for these when building zlib without LFS */
 145 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
 146     ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
 147     ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
 148     ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
 149     ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
 150 #endif
 151
 152 /* default memLevel */
 153 #if MAX_MEM_LEVEL >= 8
 154 #  define DEF_MEM_LEVEL 8
 155 #else
 156 #  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
 157 #endif
 158
 159 /* default i/o buffer size -- double this for output when reading (this and
 160    twice this must be able to fit in an unsigned type) */
 161 #define GZBUFSIZE 8192
 162
 163 /* gzip modes, also provide a little integrity check on the passed structure */
 164 #define GZ_NONE 0
 165 #define GZ_READ 7247
 166 #define GZ_WRITE 31153
 167 #define GZ_APPEND 1     /* mode set to GZ_WRITE after the file is opened */
 168
 169 /* values for gz_state how */
 170 #define LOOK 0      /* look for a gzip header */
 171 #define COPY 1      /* copy input directly */
 172 #define GZIP 2      /* decompress a gzip stream */
 173
 174 /* internal gzip file state data structure */
 175 typedef struct {
 176         /* exposed contents for gzgetc() macro */
 177     struct gzFile_s x;      /* "x" for exposed */
 178                             /* x.have: number of bytes available at x.next */
 179                             /* x.next: next output data to deliver or write */
 180                             /* x.pos: current position in uncompressed data */
 181         /* used for both reading and writing */
 182     int mode;               /* see gzip modes above */
 183     int fd;                 /* file descriptor */
 184     char *path;             /* path or fd for error messages */
 185     unsigned size;          /* buffer size, zero if not allocated yet */
 186     unsigned want;          /* requested buffer size, default is GZBUFSIZE */
 187     unsigned char *in;      /* input buffer (double-sized when writing) */
 188     unsigned char *out;     /* output buffer (double-sized when reading) */
 189     int direct;             /* 0 if processing gzip, 1 if transparent */
 190         /* just for reading */
 191     int how;                /* 0: get header, 1: copy, 2: decompress */
 192     z_off64_t start;        /* where the gzip data started, for rewinding */
 193     int eof;                /* true if end of input file reached */
 194     int past;               /* true if read requested past end */
 195         /* just for writing */
 196     int level;              /* compression level */
 197     int strategy;           /* compression strategy */
 198         /* seek request */
 199     z_off64_t skip;         /* amount to skip (already rewound if backwards) */
 200     int seek;               /* true if seek request pending */
 201         /* error information */
 202     int err;                /* error code */
 203     char *msg;              /* error message */
 204         /* zlib inflate or deflate stream */
 205     z_stream strm;          /* stream structure in-place (not a pointer) */
 206 } gz_state;
 207
 208 typedef union {
 209     gz_state FAR *state;
 210     gzFile file;
 211 } gz_statep;
 212
 213 /* shared functions */
 214 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
 215 #if defined UNDER_CE
 216 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
 217 #endif
 218
 219 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
 220    value -- needed when comparing unsigned to z_off64_t, which is signed
 221    (possible z_off64_t types off_t, off64_t, and long are all signed) */
 222 #ifdef INT_MAX
 223 #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
 224 #else
 225 unsigned ZLIB_INTERNAL gz_intmax OF((void));
 226 #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
 227 #endif