/src/FreeImage/Source/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#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 __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 */
142typedef 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;
174typedef gz_state FAR *gz_statep;
175
176/* shared functions */
177void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
178#if defined UNDER_CE
179char 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
188unsigned ZLIB_INTERNAL gz_intmax OF((void));
189#  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
190#endif