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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 "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 && defined NO_ERRNO_H |
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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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/* 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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/* 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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ZEXTERN void ZEXPORT gz_error OF((gz_statep, int, const char *)); |
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#if defined UNDER_CE && defined NO_ERRNO_H |
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ZEXTERN char ZEXPORT *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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ZEXTERN unsigned ZEXPORT 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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