[wxWidgets.git] / src / jpeg / jinclude.h

/*
 * 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)))
Commit	Line	Data
e1929140 RR	1	/*
	2	* jinclude.h
	3	*
	4	* Copyright (C) 1991-1994, Thomas G. Lane.
	5	* This file is part of the Independent JPEG Group's software.
	6	* For conditions of distribution and use, see the accompanying README file.
	7	*
	8	* This file exists to provide a single place to fix any problems with
	9	* including the wrong system include files. (Common problems are taken
	10	* care of by the standard jconfig symbols, but on really weird systems
	11	* you may have to edit this file.)
	12	*
	13	* NOTE: this file is NOT intended to be included by applications using the
	14	* JPEG library. Most applications need only include jpeglib.h.
	15	*/
	16
	17
	18	/* Include auto-config file to find out which system include files we need. */
	19
9b588fe1	20	#include "jconfig.h" /* auto configuration options */
e1929140 RR	21	#define JCONFIG_INCLUDED /* so that jpeglib.h doesn't do it again */
	22
	23	/*
	24	* We need the NULL macro and size_t typedef.
	25	* On an ANSI-conforming system it is sufficient to include <stddef.h>.
	26	* Otherwise, we get them from <stdlib.h> or <stdio.h>; we may have to
	27	* pull in <sys/types.h> as well.
	28	* Note that the core JPEG library does not require <stdio.h>;
	29	* only the default error handler and data source/destination modules do.
	30	* But we must pull it in because of the references to FILE in jpeglib.h.
	31	* You can remove those references if you want to compile without <stdio.h>.
	32	*/
	33
	34	#ifdef HAVE_STDDEF_H
	35	#include <stddef.h>
	36	#endif
	37
	38	#ifdef HAVE_STDLIB_H
	39	#include <stdlib.h>
	40	#endif
	41
	42	#ifdef NEED_SYS_TYPES_H
	43	#include <sys/types.h>
	44	#endif
	45
	46	#include <stdio.h>
	47
	48	/*
	49	* We need memory copying and zeroing functions, plus strncpy().
	50	* ANSI and System V implementations declare these in <string.h>.
	51	* BSD doesn't have the mem() functions, but it does have bcopy()/bzero().
	52	* Some systems may declare memset and memcpy in <memory.h>.
	53	*
	54	* NOTE: we assume the size parameters to these functions are of type size_t.
	55	* Change the casts in these macros if not!
	56	*/
	57
	58	#ifdef NEED_BSD_STRINGS
	59
	60	#include <strings.h>
	61	#define MEMZERO(target,size) bzero((void *)(target), (size_t)(size))
	62	#define MEMCOPY(dest,src,size) bcopy((const void )(src), (void )(dest), (size_t)(size))
	63
	64	#else /* not BSD, assume ANSI/SysV string lib */
	65
	66	#include <string.h>
	67	#define MEMZERO(target,size) memset((void *)(target), 0, (size_t)(size))
	68	#define MEMCOPY(dest,src,size) memcpy((void )(dest), (const void )(src), (size_t)(size))
	69
	70	#endif
	71
	72	/*
	73	* In ANSI C, and indeed any rational implementation, size_t is also the
	74	* type returned by sizeof(). However, it seems there are some irrational
	75	* implementations out there, in which sizeof() returns an int even though
	76	* size_t is defined as long or unsigned long. To ensure consistent results
	77	* we always use this SIZEOF() macro in place of using sizeof() directly.
	78	*/
	79
	80	#define SIZEOF(object) ((size_t) sizeof(object))
	81
	82	/*
	83	* The modules that use fread() and fwrite() always invoke them through
	84	* these macros. On some systems you may need to twiddle the argument casts.
85	* CAUTION: argument order is different from underlying functions!
86	*/
87
88	#define JFREAD(file,buf,sizeofbuf) \
89	((size_t) fread((void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
90	#define JFWRITE(file,buf,sizeofbuf) \
91	((size_t) fwrite((const void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))