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 #ifndef _MSC_VER 30 #include <unistd.h> 31 #endif 32 33 #ifdef NO_DEFLATE /* for compatibility with old definition */ 34 # define NO_GZCOMPRESS 35 #endif 36 37 #ifdef _MSC_VER 38 # include <io.h> 39 # define vsnprintf _vsnprintf 40 #endif 41 42 #ifndef local 43 # define local static 44 #endif 45 /* compile with -Dlocal if your debugger can't find static symbols */ 46 47 /* gz* functions always use library allocation functions */ 48 #ifndef STDC 49 extern voidp malloc OF((uInt size)); 50 extern void free OF((voidpf ptr)); 51 #endif 52 53 /* get errno and strerror definition */ 54 #if defined UNDER_CE 55 # include <windows.h> 56 # define zstrerror() gz_strwinerror((DWORD)GetLastError()) 57 #else 58 # ifdef STDC 59 # include <errno.h> 60 # define zstrerror() strerror(errno) 61 # else 62 # define zstrerror() "stdio error (consult errno)" 63 # endif 64 #endif 65 66 /* provide prototypes for these when building zlib without LFS */ 67 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 68 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); 69 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int)); 70 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile)); 71 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile)); 72 #endif 73 74 /* default i/o buffer size -- double this for output when reading */ 75 #define GZBUFSIZE 8192 76 77 /* gzip modes, also provide a little integrity check on the passed structure */ 78 #define GZ_NONE 0 79 #define GZ_READ 7247 80 #define GZ_WRITE 31153 81 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ 82 83 /* values for gz_state how */ 84 #define LOOK 0 /* look for a gzip header */ 85 #define COPY 1 /* copy input directly */ 86 #define GZIP 2 /* decompress a gzip stream */ 87 88 /* internal gzip file state data structure */ 89 typedef struct { 90 /* used for both reading and writing */ 91 int mode; /* see gzip modes above */ 92 int fd; /* file descriptor */ 93 char *path; /* path or fd for error messages */ 94 z_off64_t pos; /* current position in uncompressed data */ 95 unsigned size; /* buffer size, zero if not allocated yet */ 96 unsigned want; /* requested buffer size, default is GZBUFSIZE */ 97 unsigned char *in; /* input buffer */ 98 unsigned char *out; /* output buffer (double-sized when reading) */ 99 unsigned char *next; /* next output data to deliver or write */ 100 /* just for reading */ 101 unsigned have; /* amount of output data unused at next */ 102 int eof; /* true if end of input file reached */ 103 z_off64_t start; /* where the gzip data started, for rewinding */ 104 z_off64_t raw; /* where the raw data started, for seeking */ 105 int how; /* 0: get header, 1: copy, 2: decompress */ 106 int direct; /* true if last read direct, false if gzip */ 107 /* just for writing */ 108 int level; /* compression level */ 109 int strategy; /* compression strategy */ 110 /* seek request */ 111 z_off64_t skip; /* amount to skip (already rewound if backwards) */ 112 int seek; /* true if seek request pending */ 113 /* error information */ 114 int err; /* error code */ 115 char *msg; /* error message */ 116 /* zlib inflate or deflate stream */ 117 z_stream strm; /* stream structure in-place (not a pointer) */ 118 } gz_state; 119 typedef gz_state FAR *gz_statep; 120 121 /* shared functions */ 122 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *)); 123 #if defined UNDER_CE 124 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error)); 125 #endif 126 127 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 128 value -- needed when comparing unsigned to z_off64_t, which is signed 129 (possible z_off64_t types off_t, off64_t, and long are all signed) */ 130 #ifdef INT_MAX 131 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) 132 #else 133 unsigned ZLIB_INTERNAL gz_intmax OF((void)); 134 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 135 #endif 136