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 133
