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