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 

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

    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)))