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144 lines
4.8 KiB
144 lines
4.8 KiB
#ifndef GZGUTS_H_ |
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#define GZGUTS_H_ |
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/* gzguts.h -- zlib internal header definitions for gz* operations |
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* Copyright (C) 2004-2019 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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# undef _FILE_OFFSET_BITS |
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# undef _TIME_BITS |
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#endif |
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#if defined(HAVE_VISIBILITY_INTERNAL) |
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# define Z_INTERNAL __attribute__((visibility ("internal"))) |
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#elif defined(HAVE_VISIBILITY_HIDDEN) |
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# define Z_INTERNAL __attribute__((visibility ("hidden"))) |
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#else |
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# define Z_INTERNAL |
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#endif |
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#include <stdio.h> |
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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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#include <fcntl.h> |
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#if defined(ZLIB_COMPAT) |
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# include "zlib.h" |
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#else |
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# include "zlib-ng.h" |
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#endif |
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#ifdef _WIN32 |
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# include <stddef.h> |
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#endif |
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#if defined(_WIN32) |
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# include <io.h> |
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# define WIDECHAR |
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#endif |
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#ifdef WINAPI_FAMILY |
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# define open _open |
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# define read _read |
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# define write _write |
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# define close _close |
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#endif |
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/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ |
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#if !defined(STDC99) && !defined(__CYGWIN__) && !defined(__MINGW__) && defined(_WIN32) |
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# if !defined(vsnprintf) |
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# if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) |
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# define vsnprintf _vsnprintf |
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# endif |
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# endif |
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#endif |
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/* unlike snprintf (which is required in C99), _snprintf does not guarantee |
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null termination of the result -- however this is only used in gzlib.c |
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where the result is assured to fit in the space provided */ |
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#if defined(_MSC_VER) && _MSC_VER < 1900 |
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# define snprintf _snprintf |
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#endif |
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/* get errno and strerror definition */ |
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#ifndef NO_STRERROR |
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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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/* default memLevel */ |
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#if MAX_MEM_LEVEL >= 8 |
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# define DEF_MEM_LEVEL 8 |
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#else |
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# define DEF_MEM_LEVEL MAX_MEM_LEVEL |
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#endif |
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/* default i/o buffer size -- double this for output when reading (this and |
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twice this must be able to fit in an unsigned type) */ |
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#ifndef GZBUFSIZE |
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# define GZBUFSIZE 131072 |
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#endif |
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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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/* exposed contents for gzgetc() macro */ |
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struct gzFile_s x; /* "x" for exposed */ |
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/* x.have: number of bytes available at x.next */ |
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/* x.next: next output data to deliver or write */ |
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/* x.pos: current position in uncompressed data */ |
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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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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 (double-sized when writing) */ |
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unsigned char *out; /* output buffer (double-sized when reading) */ |
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int direct; /* 0 if processing gzip, 1 if transparent */ |
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/* just for reading */ |
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int how; /* 0: get header, 1: copy, 2: decompress */ |
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z_off64_t start; /* where the gzip data started, for rewinding */ |
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int eof; /* true if end of input file reached */ |
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int past; /* true if read requested past end */ |
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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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int reset; /* true if a reset is pending after a Z_FINISH */ |
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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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PREFIX3(stream) strm; /* stream structure in-place (not a pointer) */ |
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} gz_state; |
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typedef gz_state *gz_statep; |
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/* shared functions */ |
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void Z_INTERNAL gz_error(gz_state *, int, const char *); |
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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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#define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) |
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#endif /* GZGUTS_H_ */
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