gzguts.h revision 206002
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#if _LARGEFILE64_SOURCE == 1 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#define ZLIB_INTERNAL 16 17#include <stdio.h> 18#include "zlib.h" 19#ifdef STDC 20# include <string.h> 21# include <stdlib.h> 22# include <limits.h> 23#endif 24#include <fcntl.h> 25 26#ifdef NO_DEFLATE /* for compatibility with old definition */ 27# define NO_GZCOMPRESS 28#endif 29 30#ifdef _MSC_VER 31# include <io.h> 32# define vsnprintf _vsnprintf 33#endif 34 35#ifndef local 36# define local static 37#endif 38/* compile with -Dlocal if your debugger can't find static symbols */ 39 40/* gz* functions always use library allocation functions */ 41#ifndef STDC 42 extern voidp malloc OF((uInt size)); 43 extern void free OF((voidpf ptr)); 44#endif 45 46/* get errno and strerror definition */ 47#if defined UNDER_CE 48# include <windows.h> 49# define zstrerror() gz_strwinerror((DWORD)GetLastError()) 50#else 51# ifdef STDC 52# include <errno.h> 53# define zstrerror() strerror(errno) 54# else 55# define zstrerror() "stdio error (consult errno)" 56# endif 57#endif 58 59#if _LARGEFILE64_SOURCE == 1 60# define z_off64_t off64_t 61#else 62# define z_off64_t z_off_t 63#endif 64 65/* default i/o buffer size -- double this for output when reading */ 66#define GZBUFSIZE 8192 67 68/* gzip modes, also provide a little integrity check on the passed structure */ 69#define GZ_NONE 0 70#define GZ_READ 7247 71#define GZ_WRITE 31153 72#define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ 73 74/* values for gz_state how */ 75#define LOOK 0 /* look for a gzip header */ 76#define COPY 1 /* copy input directly */ 77#define GZIP 2 /* decompress a gzip stream */ 78 79/* internal gzip file state data structure */ 80typedef struct { 81 /* used for both reading and writing */ 82 int mode; /* see gzip modes above */ 83 int fd; /* file descriptor */ 84 char *path; /* path or fd for error messages */ 85 z_off64_t pos; /* current position in uncompressed data */ 86 unsigned size; /* buffer size, zero if not allocated yet */ 87 unsigned want; /* requested buffer size, default is GZBUFSIZE */ 88 unsigned char *in; /* input buffer */ 89 unsigned char *out; /* output buffer (double-sized when reading) */ 90 unsigned char *next; /* next output data to deliver or write */ 91 /* just for reading */ 92 unsigned have; /* amount of output data unused at next */ 93 int eof; /* true if end of input file reached */ 94 z_off64_t start; /* where the gzip data started, for rewinding */ 95 z_off64_t raw; /* where the raw data started, for seeking */ 96 int how; /* 0: get header, 1: copy, 2: decompress */ 97 int direct; /* true if last read direct, false if gzip */ 98 /* just for writing */ 99 int level; /* compression level */ 100 int strategy; /* compression strategy */ 101 /* seek request */ 102 z_off64_t skip; /* amount to skip (already rewound if backwards) */ 103 int seek; /* true if seek request pending */ 104 /* error information */ 105 int err; /* error code */ 106 char *msg; /* error message */ 107 /* zlib inflate or deflate stream */ 108 z_stream strm; /* stream structure in-place (not a pointer) */ 109} gz_state; 110typedef gz_state FAR *gz_statep; 111 112/* shared functions */ 113ZEXTERN void ZEXPORT gz_error OF((gz_statep, int, const char *)); 114#if defined UNDER_CE 115ZEXTERN char ZEXPORT *gz_strwinerror OF((DWORD error)); 116#endif 117 118/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 119 value -- needed when comparing unsigned to z_off64_t, which is signed 120 (possible z_off64_t types off_t, off64_t, and long are all signed) */ 121#ifdef INT_MAX 122# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) 123#else 124ZEXTERN unsigned ZEXPORT gz_intmax OF((void)); 125# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 126#endif 127