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 /*

  * jinclude.h

  *

  * Copyright (C) 1991-1994, Thomas G. Lane.

  * This file is part of the Independent JPEG Group's software.

  * For conditions of distribution and use, see the accompanying README file.

  *

  * This file exists to provide a single place to fix any problems with

  * including the wrong system include files.  (Common problems are taken

  * care of by the standard jconfig symbols, but on really weird systems

  * you may have to edit this file.)

  *

  * NOTE: this file is NOT intended to be included by applications using the

  * JPEG library.  Most applications need only include jpeglib.h.

  */

 /* Include auto-config file to find out which system include files we need. */

 #include "jconfig.h"		/* auto configuration options */

 #define JCONFIG_INCLUDED	/* so that jpeglib.h doesn't do it again */

 /*

  * We need the NULL macro and size_t typedef.

  * On an ANSI-conforming system it is sufficient to include <stddef.h>.

  * Otherwise, we get them from <stdlib.h> or <stdio.h>; we may have to

  * pull in <sys/types.h> as well.

  * Note that the core JPEG library does not require <stdio.h>;

  * only the default error handler and data source/destination modules do.

  * But we must pull it in because of the references to FILE in jpeglib.h.

  * You can remove those references if you want to compile without <stdio.h>.

  */

 #ifdef HAVE_STDDEF_H

 #include <stddef.h>

 #endif

 #ifdef HAVE_STDLIB_H

 #include <stdlib.h>

 #endif

 #ifdef NEED_SYS_TYPES_H

 #include <sys/types.h>

 #endif

 #include <stdio.h>

 /*

  * We need memory copying and zeroing functions, plus strncpy().

  * ANSI and System V implementations declare these in <string.h>.

  * BSD doesn't have the mem() functions, but it does have bcopy()/bzero().

  * Some systems may declare memset and memcpy in <memory.h>.

  *

  * NOTE: we assume the size parameters to these functions are of type size_t.

  * Change the casts in these macros if not!

  */

 #ifdef NEED_BSD_STRINGS

 #include <strings.h>

 #define MEMZERO(target,size)	bzero((void *)(target), (size_t)(size))

 #define MEMCOPY(dest,src,size)	bcopy((const void *)(src), (void *)(dest), (size_t)(size))

 #else /* not BSD, assume ANSI/SysV string lib */

 #include <string.h>

 #define MEMZERO(target,size)	memset((void *)(target), 0, (size_t)(size))

 #define MEMCOPY(dest,src,size)	memcpy((void *)(dest), (const void *)(src), (size_t)(size))

 #endif

 /*

  * In ANSI C, and indeed any rational implementation, size_t is also the

  * type returned by sizeof().  However, it seems there are some irrational

  * implementations out there, in which sizeof() returns an int even though

  * size_t is defined as long or unsigned long.  To ensure consistent results

  * we always use this SIZEOF() macro in place of using sizeof() directly.

  */

 #define SIZEOF(object)	((size_t) sizeof(object))

 /*

  * The modules that use fread() and fwrite() always invoke them through

  * these macros.  On some systems you may need to twiddle the argument casts.

  * CAUTION: argument order is different from underlying functions!

  */

 #define JFREAD(file,buf,sizeofbuf)  \

   ((size_t) fread((void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))

 #define JFWRITE(file,buf,sizeofbuf)  \

   ((size_t) fwrite((const void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))