zlib/gzguts.h

   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
   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 <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 NO_DEFLATE       /* for compatibility with old definition */
  31 #  define NO_GZCOMPRESS
  32 #endif
  33
  34 #ifdef _MSC_VER
  35 #  include <io.h>
  36 #  define vsnprintf _vsnprintf
  37 #endif
  38
  39 #ifndef local
  40 #  define local static
  41 #endif
  42 /* compile with -Dlocal if your debugger can't find static symbols */
  43
  44 /* gz* functions always use library allocation functions */
  45 #ifndef STDC
  46   extern voidp  malloc OF((uInt size));
  47   extern void   free   OF((voidpf ptr));
  48 #endif
  49
  50 /* get errno and strerror definition */
  51 #if defined UNDER_CE
  52 #  include <windows.h>
  53 #  define zstrerror() gz_strwinerror((DWORD)GetLastError())
  54 #else
  55 #  ifdef STDC
  56 #    include <errno.h>
  57 #    define zstrerror() strerror(errno)
  58 #  else
  59 #    define zstrerror() "stdio error (consult errno)"
  60 #  endif
  61 #endif
  62
  63 /* provide prototypes for these when building zlib without LFS */
  64 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
  65     ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
  66     ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
  67     ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
  68     ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
  69 #endif
  70
  71 /* default i/o buffer size -- double this for output when reading */
  72 #define GZBUFSIZE 8192
  73
  74 /* gzip modes, also provide a little integrity check on the passed structure */
  75 #define GZ_NONE 0
  76 #define GZ_READ 7247
  77 #define GZ_WRITE 31153
  78 #define GZ_APPEND 1     /* mode set to GZ_WRITE after the file is opened */
  79
  80 /* values for gz_state how */
  81 #define LOOK 0      /* look for a gzip header */
  82 #define COPY 1      /* copy input directly */
  83 #define GZIP 2      /* decompress a gzip stream */
  84
  85 /* internal gzip file state data structure */
  86 typedef struct {
  87         /* used for both reading and writing */
  88     int mode;               /* see gzip modes above */
  89     int fd;                 /* file descriptor */
  90     char *path;             /* path or fd for error messages */
  91     z_off64_t pos;          /* current position in uncompressed data */
  92     unsigned size;          /* buffer size, zero if not allocated yet */
  93     unsigned want;          /* requested buffer size, default is GZBUFSIZE */
  94     unsigned char *in;      /* input buffer */
  95     unsigned char *out;     /* output buffer (double-sized when reading) */
  96     unsigned char *next;    /* next output data to deliver or write */
  97         /* just for reading */
  98     unsigned have;          /* amount of output data unused at next */
  99     int eof;                /* true if end of input file reached */
 100     z_off64_t start;        /* where the gzip data started, for rewinding */
 101     z_off64_t raw;          /* where the raw data started, for seeking */
 102     int how;                /* 0: get header, 1: copy, 2: decompress */
 103     int direct;             /* true if last read direct, false if gzip */
 104         /* just for writing */
 105     int level;              /* compression level */
 106     int strategy;           /* compression strategy */
 107         /* seek request */
 108     z_off64_t skip;         /* amount to skip (already rewound if backwards) */
 109     int seek;               /* true if seek request pending */
 110         /* error information */
 111     int err;                /* error code */
 112     char *msg;              /* error message */
 113         /* zlib inflate or deflate stream */
 114     z_stream strm;          /* stream structure in-place (not a pointer) */
 115 } gz_state;
 116 typedef gz_state FAR *gz_statep;
 117
 118 /* shared functions */
 119 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
 120 #if defined UNDER_CE
 121 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
 122 #endif
 123
 124 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
 125    value -- needed when comparing unsigned to z_off64_t, which is signed
 126    (possible z_off64_t types off_t, off64_t, and long are all signed) */
 127 #ifdef INT_MAX
 128 #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
 129 #else
 130 unsigned ZLIB_INTERNAL gz_intmax OF((void));
 131 #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
 132 #endif