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