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1.8.7

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