external/zlib-1.2.11/gzguts.h
author Sam Lantinga <slouken@libsdl.org>
Fri, 26 Oct 2018 14:58:01 -0700
changeset 617 d64228a395fc
parent 521 9ed2f7d4a251
permissions -rw-r--r--
Fixed webp library detection when cross-compiling for Windows
     1 /* gzguts.h -- zlib internal header definitions for gz* operations
     2  * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 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 
    29 #ifndef _POSIX_SOURCE
    30 #  define _POSIX_SOURCE
    31 #endif
    32 #include <fcntl.h>
    33 
    34 #ifdef _WIN32
    35 #  include <stddef.h>
    36 #endif
    37 
    38 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
    39 #  include <io.h>
    40 #endif
    41 
    42 #if defined(_WIN32) || defined(__CYGWIN__)
    43 #  define WIDECHAR
    44 #endif
    45 
    46 #ifdef WINAPI_FAMILY
    47 #  define open _open
    48 #  define read _read
    49 #  define write _write
    50 #  define close _close
    51 #endif
    52 
    53 #ifdef NO_DEFLATE       /* for compatibility with old definition */
    54 #  define NO_GZCOMPRESS
    55 #endif
    56 
    57 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
    58 #  ifndef HAVE_VSNPRINTF
    59 #    define HAVE_VSNPRINTF
    60 #  endif
    61 #endif
    62 
    63 #if defined(__CYGWIN__)
    64 #  ifndef HAVE_VSNPRINTF
    65 #    define HAVE_VSNPRINTF
    66 #  endif
    67 #endif
    68 
    69 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
    70 #  ifndef HAVE_VSNPRINTF
    71 #    define HAVE_VSNPRINTF
    72 #  endif
    73 #endif
    74 
    75 #ifndef HAVE_VSNPRINTF
    76 #  ifdef MSDOS
    77 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
    78    but for now we just assume it doesn't. */
    79 #    define NO_vsnprintf
    80 #  endif
    81 #  ifdef __TURBOC__
    82 #    define NO_vsnprintf
    83 #  endif
    84 #  ifdef WIN32
    85 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
    86 #    if !defined(vsnprintf) && !defined(NO_vsnprintf)
    87 #      if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
    88 #         define vsnprintf _vsnprintf
    89 #      endif
    90 #    endif
    91 #  endif
    92 #  ifdef __SASC
    93 #    define NO_vsnprintf
    94 #  endif
    95 #  ifdef VMS
    96 #    define NO_vsnprintf
    97 #  endif
    98 #  ifdef __OS400__
    99 #    define NO_vsnprintf
   100 #  endif
   101 #  ifdef __MVS__
   102 #    define NO_vsnprintf
   103 #  endif
   104 #endif
   105 
   106 /* unlike snprintf (which is required in C99), _snprintf does not guarantee
   107    null termination of the result -- however this is only used in gzlib.c where
   108    the result is assured to fit in the space provided */
   109 #if defined(_MSC_VER) && _MSC_VER < 1900
   110 #  define snprintf _snprintf
   111 #endif
   112 
   113 #ifndef local
   114 #  define local static
   115 #endif
   116 /* since "static" is used to mean two completely different things in C, we
   117    define "local" for the non-static meaning of "static", for readability
   118    (compile with -Dlocal if your debugger can't find static symbols) */
   119 
   120 /* gz* functions always use library allocation functions */
   121 #ifndef STDC
   122   extern voidp  malloc OF((uInt size));
   123   extern void   free   OF((voidpf ptr));
   124 #endif
   125 
   126 /* get errno and strerror definition */
   127 #if defined UNDER_CE
   128 #  include <windows.h>
   129 #  define zstrerror() gz_strwinerror((DWORD)GetLastError())
   130 #else
   131 #  ifndef NO_STRERROR
   132 #    include <errno.h>
   133 #    define zstrerror() strerror(errno)
   134 #  else
   135 #    define zstrerror() "stdio error (consult errno)"
   136 #  endif
   137 #endif
   138 
   139 /* provide prototypes for these when building zlib without LFS */
   140 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
   141     ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
   142     ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
   143     ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
   144     ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
   145 #endif
   146 
   147 /* default memLevel */
   148 #if MAX_MEM_LEVEL >= 8
   149 #  define DEF_MEM_LEVEL 8
   150 #else
   151 #  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
   152 #endif
   153 
   154 /* default i/o buffer size -- double this for output when reading (this and
   155    twice this must be able to fit in an unsigned type) */
   156 #define GZBUFSIZE 8192
   157 
   158 /* gzip modes, also provide a little integrity check on the passed structure */
   159 #define GZ_NONE 0
   160 #define GZ_READ 7247
   161 #define GZ_WRITE 31153
   162 #define GZ_APPEND 1     /* mode set to GZ_WRITE after the file is opened */
   163 
   164 /* values for gz_state how */
   165 #define LOOK 0      /* look for a gzip header */
   166 #define COPY 1      /* copy input directly */
   167 #define GZIP 2      /* decompress a gzip stream */
   168 
   169 /* internal gzip file state data structure */
   170 typedef struct {
   171         /* exposed contents for gzgetc() macro */
   172     struct gzFile_s x;      /* "x" for exposed */
   173                             /* x.have: number of bytes available at x.next */
   174                             /* x.next: next output data to deliver or write */
   175                             /* x.pos: current position in uncompressed data */
   176         /* used for both reading and writing */
   177     int mode;               /* see gzip modes above */
   178     int fd;                 /* file descriptor */
   179     char *path;             /* path or fd for error messages */
   180     unsigned size;          /* buffer size, zero if not allocated yet */
   181     unsigned want;          /* requested buffer size, default is GZBUFSIZE */
   182     unsigned char *in;      /* input buffer (double-sized when writing) */
   183     unsigned char *out;     /* output buffer (double-sized when reading) */
   184     int direct;             /* 0 if processing gzip, 1 if transparent */
   185         /* just for reading */
   186     int how;                /* 0: get header, 1: copy, 2: decompress */
   187     z_off64_t start;        /* where the gzip data started, for rewinding */
   188     int eof;                /* true if end of input file reached */
   189     int past;               /* true if read requested past end */
   190         /* just for writing */
   191     int level;              /* compression level */
   192     int strategy;           /* compression strategy */
   193         /* seek request */
   194     z_off64_t skip;         /* amount to skip (already rewound if backwards) */
   195     int seek;               /* true if seek request pending */
   196         /* error information */
   197     int err;                /* error code */
   198     char *msg;              /* error message */
   199         /* zlib inflate or deflate stream */
   200     z_stream strm;          /* stream structure in-place (not a pointer) */
   201 } gz_state;
   202 typedef gz_state FAR *gz_statep;
   203 
   204 /* shared functions */
   205 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
   206 #if defined UNDER_CE
   207 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
   208 #endif
   209 
   210 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
   211    value -- needed when comparing unsigned to z_off64_t, which is signed
   212    (possible z_off64_t types off_t, off64_t, and long are all signed) */
   213 #ifdef INT_MAX
   214 #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
   215 #else
   216 unsigned ZLIB_INTERNAL gz_intmax OF((void));
   217 #  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
   218 #endif