/* This file is part of libmspack.

  * (C) 2003-2018 Stuart Caie.

  *
  * libmspack is free software; you can redistribute it and/or modify it under
  * the terms of the GNU Lesser General Public License (LGPL) version 2.1
  *
  * For further details, see the file COPYING.LIB distributed with libmspack
  */
 
 #ifndef MSPACK_SYSTEM_H
 #define MSPACK_SYSTEM_H 1
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 /* ensure config.h is read before mspack.h */
 #ifdef HAVE_CONFIG_H
 # include <config.h>
 #endif
 

 #include "mspack.h"

 /* assume <string.h> exists */
 #include <string.h>
 

 /* fix for problem with GCC 4 and glibc (thanks to Ville Skytta)
  * http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=150429
  */
 #ifdef read
 # undef read
 #endif
 
 /* Old GCCs don't have __func__, but __FUNCTION__:
  * http://gcc.gnu.org/onlinedocs/gcc/Function-Names.html
  */

 #if __STDC_VERSION__ < 199901L
 # if __GNUC__ >= 2
 #  define __func__ __FUNCTION__
 # else
 #  define __func__ "<unknown>"

 # endif

 #endif

 #if DEBUG
 # include <stdio.h>
 # define D(x) do { printf("%s:%d (%s) ",__FILE__, __LINE__, __func__); \
                    printf x ; fputc('\n', stdout); fflush(stdout);} while (0);

 #else

 # define D(x)

 #endif
 
 /* CAB supports searching through files over 4GB in size, and the CHM file
  * format actively uses 64-bit offsets. These can only be fully supported
  * if the system the code runs on supports large files. If not, the library
  * will work as normal using only 32-bit arithmetic, but if an offset
  * greater than 2GB is detected, an error message indicating the library
  * can't support the file should be printed.
  */

 #if HAVE_INTTYPES_H
 # include <inttypes.h>
 #else
 # define PRId64 "lld"
 # define PRIu64 "llu"
 # define PRId32 "ld"
 # define PRIu32 "lu"
 #endif
 

 #include <limits.h>

 #if ((defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS >= 64) || \
      (defined(FILESIZEBITS)      && FILESIZEBITS      >= 64) || \

      defined(_LARGEFILE_SOURCE) || defined(_LARGEFILE64_SOURCE) || \
      SIZEOF_OFF_T >= 8)

 # define LARGEFILE_SUPPORT 1
 # define LD PRId64
 # define LU PRIu64

 #else
 extern const char *largefile_msg;

 # define LD PRId32
 # define LU PRIu32

 #endif
 
 /* endian-neutral reading of little-endian data */

 #define __egi32(a,n) (((unsigned int) ((unsigned char *)(a))[n+3] << 24) | \
                       ((unsigned int) ((unsigned char *)(a))[n+2] << 16) | \
                       ((unsigned int) ((unsigned char *)(a))[n+1] <<  8) | \
                       ((unsigned int) ((unsigned char *)(a))[n]))
 #define EndGetI64(a) (((unsigned long long int) __egi32(a,4) << 32) | __egi32(a,0))

 #define EndGetI32(a) __egi32(a,0)
 #define EndGetI16(a) ((((a)[1])<<8)|((a)[0]))
 
 /* endian-neutral reading of big-endian data */

 #define EndGetM32(a) (((unsigned int) ((unsigned char *)(a))[0] << 24) | \
                       ((unsigned int) ((unsigned char *)(a))[1] << 16) | \
                       ((unsigned int) ((unsigned char *)(a))[2] <<  8) | \
                       ((unsigned int) ((unsigned char *)(a))[3]))

 #define EndGetM16(a) ((((a)[0])<<8)|((a)[1]))
 
 extern struct mspack_system *mspack_default_system;
 
 /* returns the length of a file opened for reading */
 extern int mspack_sys_filelen(struct mspack_system *system,

                               struct mspack_file *file, off_t *length);

 
 /* validates a system structure */
 extern int mspack_valid_system(struct mspack_system *sys);
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif