/* gzguts.h -- zlib internal header definitions for gz* operations | |
* Copyright (C) 2004, 2005, 2010 Mark Adler | |
* For conditions of distribution and use, see copyright notice in zlib.h | |
*/ | |
#ifdef _LARGEFILE64_SOURCE | |
# ifndef _LARGEFILE_SOURCE | |
# define _LARGEFILE_SOURCE 1 | |
# endif | |
# ifdef _FILE_OFFSET_BITS | |
# undef _FILE_OFFSET_BITS | |
# endif | |
#endif | |
#if ((__GNUC__-0) * 10 + __GNUC_MINOR__-0 >= 33) && !defined(NO_VIZ) && !defined(_WIN32) | |
# define ZLIB_INTERNAL __attribute__((visibility ("hidden"))) | |
#else | |
# define ZLIB_INTERNAL | |
#endif | |
#include <stdio.h> | |
#include "zlib.h" | |
#ifdef STDC | |
# include <string.h> | |
# include <stdlib.h> | |
# include <limits.h> | |
#endif | |
#include <fcntl.h> | |
#ifdef NO_DEFLATE /* for compatibility with old definition */ | |
# define NO_GZCOMPRESS | |
#endif | |
#ifdef _MSC_VER | |
# include <io.h> | |
# define vsnprintf _vsnprintf | |
#endif | |
#ifndef local | |
# define local static | |
#endif | |
/* compile with -Dlocal if your debugger can't find static symbols */ | |
/* gz* functions always use library allocation functions */ | |
#ifndef STDC | |
extern voidp malloc OF((uInt size)); | |
extern void free OF((voidpf ptr)); | |
#endif | |
/* get errno and strerror definition */ | |
#if defined UNDER_CE | |
# include <windows.h> | |
# define zstrerror() gz_strwinerror((DWORD)GetLastError()) | |
#else | |
# ifdef STDC | |
# include <errno.h> | |
# define zstrerror() strerror(errno) | |
# else | |
# define zstrerror() "stdio error (consult errno)" | |
# endif | |
#endif | |
/* provide prototypes for these when building zlib without LFS */ | |
#if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 | |
ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); | |
ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int)); | |
ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile)); | |
ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile)); | |
#endif | |
/* default i/o buffer size -- double this for output when reading */ | |
#define GZBUFSIZE 8192 | |
/* gzip modes, also provide a little integrity check on the passed structure */ | |
#define GZ_NONE 0 | |
#define GZ_READ 7247 | |
#define GZ_WRITE 31153 | |
#define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ | |
/* values for gz_state how */ | |
#define LOOK 0 /* look for a gzip header */ | |
#define COPY 1 /* copy input directly */ | |
#define GZIP 2 /* decompress a gzip stream */ | |
/* internal gzip file state data structure */ | |
typedef struct { | |
/* used for both reading and writing */ | |
int mode; /* see gzip modes above */ | |
int fd; /* file descriptor */ | |
char *path; /* path or fd for error messages */ | |
z_off64_t pos; /* current position in uncompressed data */ | |
unsigned size; /* buffer size, zero if not allocated yet */ | |
unsigned want; /* requested buffer size, default is GZBUFSIZE */ | |
unsigned char *in; /* input buffer */ | |
unsigned char *out; /* output buffer (double-sized when reading) */ | |
unsigned char *next; /* next output data to deliver or write */ | |
/* just for reading */ | |
unsigned have; /* amount of output data unused at next */ | |
int eof; /* true if end of input file reached */ | |
z_off64_t start; /* where the gzip data started, for rewinding */ | |
z_off64_t raw; /* where the raw data started, for seeking */ | |
int how; /* 0: get header, 1: copy, 2: decompress */ | |
int direct; /* true if last read direct, false if gzip */ | |
/* just for writing */ | |
int level; /* compression level */ | |
int strategy; /* compression strategy */ | |
/* seek request */ | |
z_off64_t skip; /* amount to skip (already rewound if backwards) */ | |
int seek; /* true if seek request pending */ | |
/* error information */ | |
int err; /* error code */ | |
char *msg; /* error message */ | |
/* zlib inflate or deflate stream */ | |
z_stream strm; /* stream structure in-place (not a pointer) */ | |
} gz_state; | |
typedef gz_state FAR *gz_statep; | |
/* shared functions */ | |
void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *)); | |
#if defined UNDER_CE | |
char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error)); | |
#endif | |
/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t | |
value -- needed when comparing unsigned to z_off64_t, which is signed | |
(possible z_off64_t types off_t, off64_t, and long are all signed) */ | |
#ifdef INT_MAX | |
# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) | |
#else | |
unsigned ZLIB_INTERNAL gz_intmax OF((void)); | |
# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) | |
#endif |