110 lines
3.4 KiB
C
110 lines
3.4 KiB
C
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/* 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
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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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#define ZLIB_INTERNAL
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include "zlib.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 WIN32
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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 && defined NO_ERRNO_H
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# define zstrerror(errnum) strwinerror((DWORD)errnum)
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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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/* MVS fdopen() */
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#ifdef __MVS__
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# pragma map (fdopen , "\174\174FDOPEN")
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FILE *fdopen(int, const char *);
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#endif
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#ifdef _LARGEFILE64_SOURCE
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# define z_off64_t off64_t
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#else
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# define z_off64_t z_off_t
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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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/* 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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int how; /* 0: get header, 1: copy, 2: decompress */
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unsigned have; /* amount of output data unused */
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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 eof; /* true if end of input file reached */
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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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int seek; /* true if seek request pending */
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z_off64_t skip; /* amount to skip (already rewound if backwards) */
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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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ZEXTERN void ZEXPORT gz_error OF((gz_statep, int, char *));
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