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