114 lines
3.3 KiB
C
114 lines
3.3 KiB
C
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/* This file is part of libmspack.
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* (C) 2003-2018 Stuart Caie.
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*
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* libmspack is free software; you can redistribute it and/or modify it under
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* the terms of the GNU Lesser General Public License (LGPL) version 2.1
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*
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* For further details, see the file COPYING.LIB distributed with libmspack
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*/
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#ifndef MSPACK_SYSTEM_H
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#define MSPACK_SYSTEM_H 1
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* ensure config.h is read before mspack.h */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <mspack.h>
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/* assume <string.h> exists */
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#include <string.h>
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/* fix for problem with GCC 4 and glibc (thanks to Ville Skytta)
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* http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=150429
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*/
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#ifdef read
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# undef read
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#endif
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/* Old GCCs don't have __func__, but __FUNCTION__:
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* http://gcc.gnu.org/onlinedocs/gcc/Function-Names.html
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*/
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#if __STDC_VERSION__ < 199901L
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# if __GNUC__ >= 2
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# define __func__ __FUNCTION__
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# else
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# define __func__ "<unknown>"
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# endif
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#endif
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#if DEBUG
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# include <stdio.h>
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# define D(x) do { printf("%s:%d (%s) ",__FILE__, __LINE__, __func__); \
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printf x ; fputc('\n', stdout); fflush(stdout);} while (0);
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#else
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# define D(x)
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#endif
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/* CAB supports searching through files over 4GB in size, and the CHM file
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* format actively uses 64-bit offsets. These can only be fully supported
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* if the system the code runs on supports large files. If not, the library
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* will work as normal using only 32-bit arithmetic, but if an offset
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* greater than 2GB is detected, an error message indicating the library
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* can't support the file should be printed.
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*/
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#if HAVE_INTTYPES_H
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# include <inttypes.h>
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#else
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# define PRId64 "lld"
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# define PRIu64 "llu"
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# define PRId32 "ld"
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# define PRIu32 "lu"
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#endif
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#include <limits.h>
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#if ((defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS >= 64) || \
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(defined(FILESIZEBITS) && FILESIZEBITS >= 64) || \
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defined(_LARGEFILE_SOURCE) || defined(_LARGEFILE64_SOURCE) || \
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SIZEOF_OFF_T >= 8)
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# define LARGEFILE_SUPPORT 1
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# define LD PRId64
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# define LU PRIu64
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#else
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extern const char *largefile_msg;
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# define LD PRId32
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# define LU PRIu32
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#endif
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/* endian-neutral reading of little-endian data */
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#define __egi32(a,n) ( ((((unsigned char *) a)[n+3]) << 24) | \
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((((unsigned char *) a)[n+2]) << 16) | \
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((((unsigned char *) a)[n+1]) << 8) | \
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((((unsigned char *) a)[n+0])))
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#define EndGetI64(a) ((((unsigned long long int) __egi32(a,4)) << 32) | \
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((unsigned int) __egi32(a,0)))
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#define EndGetI32(a) __egi32(a,0)
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#define EndGetI16(a) ((((a)[1])<<8)|((a)[0]))
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/* endian-neutral reading of big-endian data */
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#define EndGetM32(a) (((((unsigned char *) a)[0]) << 24) | \
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((((unsigned char *) a)[1]) << 16) | \
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((((unsigned char *) a)[2]) << 8) | \
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((((unsigned char *) a)[3])))
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#define EndGetM16(a) ((((a)[0])<<8)|((a)[1]))
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extern struct mspack_system *mspack_default_system;
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/* returns the length of a file opened for reading */
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extern int mspack_sys_filelen(struct mspack_system *system,
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struct mspack_file *file, off_t *length);
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/* validates a system structure */
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extern int mspack_valid_system(struct mspack_system *sys);
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#ifdef __cplusplus
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}
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#endif
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#endif
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