    /*
     * 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)))