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/modules/zlib/src/gzguts.h

http://github.com/zpao/v8monkey
C Header | 132 lines | 95 code | 15 blank | 22 comment | 7 complexity | 586948bb2990598a5ca6e34f24b790f5 MD5 | raw file
  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 */
 86typedef 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;
116typedef gz_state FAR *gz_statep;
117
118/* shared functions */
119void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
120#if defined UNDER_CE
121char 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
130unsigned ZLIB_INTERNAL gz_intmax OF((void));
131#  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
132#endif