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1
2/* pngconf.h - machine configurable file for libpng
3 *
4 * libpng version 1.5.9 - February 18, 2012
5 *
6 * Copyright (c) 1998-2012 Glenn Randers-Pehrson
7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
9 *
10 * This code is released under the libpng license.
11 * For conditions of distribution and use, see the disclaimer
12 * and license in png.h
13 *
14 */
15
16/* Any machine specific code is near the front of this file, so if you
17 * are configuring libpng for a machine, you may want to read the section
18 * starting here down to where it starts to typedef png_color, png_text,
19 * and png_info.
20 */
21
22#ifndef PNGCONF_H
23#define PNGCONF_H
24
25#ifndef PNG_BUILDING_SYMBOL_TABLE
26/* PNG_NO_LIMITS_H may be used to turn off the use of the standard C
27 * definition file for machine specific limits, this may impact the
28 * correctness of the definitons below (see uses of INT_MAX).
29 */
30# ifndef PNG_NO_LIMITS_H
31# include <limits.h>
32# endif
33
34/* For the memory copy APIs (i.e. the standard definitions of these),
35 * because this file defines png_memcpy and so on the base APIs must
36 * be defined here.
37 */
38# ifdef BSD
39# include <strings.h>
40# else
41# include <string.h>
42# endif
43
44/* For png_FILE_p - this provides the standard definition of a
45 * FILE
46 */
47# ifdef PNG_STDIO_SUPPORTED
48# include <stdio.h>
49# endif
50#endif
51
52/* This controls optimization of the reading of 16 and 32 bit values
53 * from PNG files. It can be set on a per-app-file basis - it
54 * just changes whether a macro is used to the function is called.
55 * The library builder sets the default, if read functions are not
56 * built into the library the macro implementation is forced on.
57 */
58#ifndef PNG_READ_INT_FUNCTIONS_SUPPORTED
59# define PNG_USE_READ_MACROS
60#endif
61#if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS)
62# if PNG_DEFAULT_READ_MACROS
63# define PNG_USE_READ_MACROS
64# endif
65#endif
66
67/* COMPILER SPECIFIC OPTIONS.
68 *
69 * These options are provided so that a variety of difficult compilers
70 * can be used. Some are fixed at build time (e.g. PNG_API_RULE
71 * below) but still have compiler specific implementations, others
72 * may be changed on a per-file basis when compiling against libpng.
73 */
74
75/* The PNGARG macro protects us against machines that don't have function
76 * prototypes (ie K&R style headers). If your compiler does not handle
77 * function prototypes, define this macro and use the included ansi2knr.
78 * I've always been able to use _NO_PROTO as the indicator, but you may
79 * need to drag the empty declaration out in front of here, or change the
80 * ifdef to suit your own needs.
81 */
82#ifndef PNGARG
83
84# ifdef OF /* zlib prototype munger */
85# define PNGARG(arglist) OF(arglist)
86# else
87
88# ifdef _NO_PROTO
89# define PNGARG(arglist) ()
90# else
91# define PNGARG(arglist) arglist
92# endif /* _NO_PROTO */
93
94# endif /* OF */
95
96#endif /* PNGARG */
97
98/* Function calling conventions.
99 * =============================
100 * Normally it is not necessary to specify to the compiler how to call
101 * a function - it just does it - however on x86 systems derived from
102 * Microsoft and Borland C compilers ('IBM PC', 'DOS', 'Windows' systems
103 * and some others) there are multiple ways to call a function and the
104 * default can be changed on the compiler command line. For this reason
105 * libpng specifies the calling convention of every exported function and
106 * every function called via a user supplied function pointer. This is
107 * done in this file by defining the following macros:
108 *
109 * PNGAPI Calling convention for exported functions.
110 * PNGCBAPI Calling convention for user provided (callback) functions.
111 * PNGCAPI Calling convention used by the ANSI-C library (required
112 * for longjmp callbacks and sometimes used internally to
113 * specify the calling convention for zlib).
114 *
115 * These macros should never be overridden. If it is necessary to
116 * change calling convention in a private build this can be done
117 * by setting PNG_API_RULE (which defaults to 0) to one of the values
118 * below to select the correct 'API' variants.
119 *
120 * PNG_API_RULE=0 Use PNGCAPI - the 'C' calling convention - throughout.
121 * This is correct in every known environment.
122 * PNG_API_RULE=1 Use the operating system convention for PNGAPI and
123 * the 'C' calling convention (from PNGCAPI) for
124 * callbacks (PNGCBAPI). This is no longer required
125 * in any known environment - if it has to be used
126 * please post an explanation of the problem to the
127 * libpng mailing list.
128 *
129 * These cases only differ if the operating system does not use the C
130 * calling convention, at present this just means the above cases
131 * (x86 DOS/Windows sytems) and, even then, this does not apply to
132 * Cygwin running on those systems.
133 *
134 * Note that the value must be defined in pnglibconf.h so that what
135 * the application uses to call the library matches the conventions
136 * set when building the library.
137 */
138
139/* Symbol export
140 * =============
141 * When building a shared library it is almost always necessary to tell
142 * the compiler which symbols to export. The png.h macro 'PNG_EXPORT'
143 * is used to mark the symbols. On some systems these symbols can be
144 * extracted at link time and need no special processing by the compiler,
145 * on other systems the symbols are flagged by the compiler and just
146 * the declaration requires a special tag applied (unfortunately) in a
147 * compiler dependent way. Some systems can do either.
148 *
149 * A small number of older systems also require a symbol from a DLL to
150 * be flagged to the program that calls it. This is a problem because
151 * we do not know in the header file included by application code that
152 * the symbol will come from a shared library, as opposed to a statically
153 * linked one. For this reason the application must tell us by setting
154 * the magic flag PNG_USE_DLL to turn on the special processing before
155 * it includes png.h.
156 *
157 * Four additional macros are used to make this happen:
158 *
159 * PNG_IMPEXP The magic (if any) to cause a symbol to be exported from
160 * the build or imported if PNG_USE_DLL is set - compiler
161 * and system specific.
162 *
163 * PNG_EXPORT_TYPE(type) A macro that pre or appends PNG_IMPEXP to
164 * 'type', compiler specific.
165 *
166 * PNG_DLL_EXPORT Set to the magic to use during a libpng build to
167 * make a symbol exported from the DLL. Not used in the
168 * public header files; see pngpriv.h for how it is used
169 * in the libpng build.
170 *
171 * PNG_DLL_IMPORT Set to the magic to force the libpng symbols to come
172 * from a DLL - used to define PNG_IMPEXP when
173 * PNG_USE_DLL is set.
174 */
175
176/* System specific discovery.
177 * ==========================
178 * This code is used at build time to find PNG_IMPEXP, the API settings
179 * and PNG_EXPORT_TYPE(), it may also set a macro to indicate the DLL
180 * import processing is possible. On Windows/x86 systems it also sets
181 * compiler-specific macros to the values required to change the calling
182 * conventions of the various functions.
183 */
184#if ( defined(_Windows) || defined(_WINDOWS) || defined(WIN32) ||\
185 defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__) ) &&\
186 ( defined(_X86_) || defined(_X64_) || defined(_M_IX86) ||\
187 defined(_M_X64) || defined(_M_IA64) )
188 /* Windows system (DOS doesn't support DLLs) running on x86/x64. Includes
189 * builds under Cygwin or MinGW. Also includes Watcom builds but these need
190 * special treatment because they are not compatible with GCC or Visual C
191 * because of different calling conventions.
192 */
193# if PNG_API_RULE == 2
194 /* If this line results in an error, either because __watcall is not
195 * understood or because of a redefine just below you cannot use *this*
196 * build of the library with the compiler you are using. *This* build was
197 * build using Watcom and applications must also be built using Watcom!
198 */
199# define PNGCAPI __watcall
200# endif
201
202# if defined(__GNUC__) || (defined (_MSC_VER) && (_MSC_VER >= 800))
203# define PNGCAPI __cdecl
204# if PNG_API_RULE == 1
205# define PNGAPI __stdcall
206# endif
207# else
208 /* An older compiler, or one not detected (erroneously) above,
209 * if necessary override on the command line to get the correct
210 * variants for the compiler.
211 */
212# ifndef PNGCAPI
213# define PNGCAPI _cdecl
214# endif
215# if PNG_API_RULE == 1 && !defined(PNGAPI)
216# define PNGAPI _stdcall
217# endif
218# endif /* compiler/api */
219 /* NOTE: PNGCBAPI always defaults to PNGCAPI. */
220
221# if defined(PNGAPI) && !defined(PNG_USER_PRIVATEBUILD)
222 ERROR: PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed
223# endif
224
225# if (defined(_MSC_VER) && _MSC_VER < 800) ||\
226 (defined(__BORLANDC__) && __BORLANDC__ < 0x500)
227 /* older Borland and MSC
228 * compilers used '__export' and required this to be after
229 * the type.
230 */
231# ifndef PNG_EXPORT_TYPE
232# define PNG_EXPORT_TYPE(type) type PNG_IMPEXP
233# endif
234# define PNG_DLL_EXPORT __export
235# else /* newer compiler */
236# define PNG_DLL_EXPORT __declspec(dllexport)
237# ifndef PNG_DLL_IMPORT
238# define PNG_DLL_IMPORT __declspec(dllimport)
239# endif
240# endif /* compiler */
241
242#else /* !Windows/x86 */
243# if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__)
244# define PNGAPI _System
245# else /* !Windows/x86 && !OS/2 */
246 /* Use the defaults, or define PNG*API on the command line (but
247 * this will have to be done for every compile!)
248 */
249# endif /* other system, !OS/2 */
250#endif /* !Windows/x86 */
251
252/* Now do all the defaulting . */
253#ifndef PNGCAPI
254# define PNGCAPI
255#endif
256#ifndef PNGCBAPI
257# define PNGCBAPI PNGCAPI
258#endif
259#ifndef PNGAPI
260# define PNGAPI PNGCAPI
261#endif
262
263/* PNG_IMPEXP may be set on the compilation system command line or (if not set)
264 * then in an internal header file when building the library, otherwise (when
265 * using the library) it is set here.
266 */
267#ifndef PNG_IMPEXP
268# if defined(PNG_USE_DLL) && defined(PNG_DLL_IMPORT)
269 /* This forces use of a DLL, disallowing static linking */
270# define PNG_IMPEXP PNG_DLL_IMPORT
271# endif
272
273# ifndef PNG_IMPEXP
274# define PNG_IMPEXP
275# endif
276#endif
277
278/* In 1.5.2 the definition of PNG_FUNCTION has been changed to always treat
279 * 'attributes' as a storage class - the attributes go at the start of the
280 * function definition, and attributes are always appended regardless of the
281 * compiler. This considerably simplifies these macros but may cause problems
282 * if any compilers both need function attributes and fail to handle them as
283 * a storage class (this is unlikely.)
284 */
285#ifndef PNG_FUNCTION
286# define PNG_FUNCTION(type, name, args, attributes) attributes type name args
287#endif
288
289#ifndef PNG_EXPORT_TYPE
290# define PNG_EXPORT_TYPE(type) PNG_IMPEXP type
291#endif
292
293 /* The ordinal value is only relevant when preprocessing png.h for symbol
294 * table entries, so we discard it here. See the .dfn files in the
295 * scripts directory.
296 */
297#ifndef PNG_EXPORTA
298
299# define PNG_EXPORTA(ordinal, type, name, args, attributes)\
300 PNG_FUNCTION(PNG_EXPORT_TYPE(type),(PNGAPI name),PNGARG(args), \
301 extern attributes)
302#endif
303
304/* ANSI-C (C90) does not permit a macro to be invoked with an empty argument,
305 * so make something non-empty to satisfy the requirement:
306 */
307#define PNG_EMPTY /*empty list*/
308
309#define PNG_EXPORT(ordinal, type, name, args)\
310 PNG_EXPORTA(ordinal, type, name, args, PNG_EMPTY)
311
312/* Use PNG_REMOVED to comment out a removed interface. */
313#ifndef PNG_REMOVED
314# define PNG_REMOVED(ordinal, type, name, args, attributes)
315#endif
316
317#ifndef PNG_CALLBACK
318# define PNG_CALLBACK(type, name, args) type (PNGCBAPI name) PNGARG(args)
319#endif
320
321/* Support for compiler specific function attributes. These are used
322 * so that where compiler support is available incorrect use of API
323 * functions in png.h will generate compiler warnings.
324 *
325 * Added at libpng-1.2.41.
326 */
327
328#ifndef PNG_NO_PEDANTIC_WARNINGS
329# ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED
330# define PNG_PEDANTIC_WARNINGS_SUPPORTED
331# endif
332#endif
333
334#ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED
335 /* Support for compiler specific function attributes. These are used
336 * so that where compiler support is available incorrect use of API
337 * functions in png.h will generate compiler warnings. Added at libpng
338 * version 1.2.41.
339 */
340# if defined(__GNUC__)
341# ifndef PNG_USE_RESULT
342# define PNG_USE_RESULT __attribute__((__warn_unused_result__))
343# endif
344# ifndef PNG_NORETURN
345# define PNG_NORETURN __attribute__((__noreturn__))
346# endif
347# ifndef PNG_ALLOCATED
348# define PNG_ALLOCATED __attribute__((__malloc__))
349# endif
350# ifndef PNG_DEPRECATED
351# define PNG_DEPRECATED __attribute__((__deprecated__))
352# endif
353# ifndef PNG_PRIVATE
354# if 0 /* Doesn't work so we use deprecated instead*/
355# define PNG_PRIVATE \
356 __attribute__((warning("This function is not exported by libpng.")))
357# else
358# define PNG_PRIVATE \
359 __attribute__((__deprecated__))
360# endif
361# endif
362# endif /* __GNUC__ */
363
364# if defined(_MSC_VER) && (_MSC_VER >= 1300)
365# ifndef PNG_USE_RESULT
366# define PNG_USE_RESULT /* not supported */
367# endif
368# ifndef PNG_NORETURN
369# define PNG_NORETURN __declspec(noreturn)
370# endif
371# ifndef PNG_ALLOCATED
372# if (_MSC_VER >= 1400)
373# define PNG_ALLOCATED __declspec(restrict)
374# endif
375# endif
376# ifndef PNG_DEPRECATED
377# define PNG_DEPRECATED __declspec(deprecated)
378# endif
379# ifndef PNG_PRIVATE
380# define PNG_PRIVATE __declspec(deprecated)
381# endif
382# endif /* _MSC_VER */
383#endif /* PNG_PEDANTIC_WARNINGS */
384
385#ifndef PNG_DEPRECATED
386# define PNG_DEPRECATED /* Use of this function is deprecated */
387#endif
388#ifndef PNG_USE_RESULT
389# define PNG_USE_RESULT /* The result of this function must be checked */
390#endif
391#ifndef PNG_NORETURN
392# define PNG_NORETURN /* This function does not return */
393#endif
394#ifndef PNG_ALLOCATED
395# define PNG_ALLOCATED /* The result of the function is new memory */
396#endif
397#ifndef PNG_PRIVATE
398# define PNG_PRIVATE /* This is a private libpng function */
399#endif
400#ifndef PNG_FP_EXPORT /* A floating point API. */
401# ifdef PNG_FLOATING_POINT_SUPPORTED
402# define PNG_FP_EXPORT(ordinal, type, name, args)\
403 PNG_EXPORT(ordinal, type, name, args)
404# else /* No floating point APIs */
405# define PNG_FP_EXPORT(ordinal, type, name, args)
406# endif
407#endif
408#ifndef PNG_FIXED_EXPORT /* A fixed point API. */
409# ifdef PNG_FIXED_POINT_SUPPORTED
410# define PNG_FIXED_EXPORT(ordinal, type, name, args)\
411 PNG_EXPORT(ordinal, type, name, args)
412# else /* No fixed point APIs */
413# define PNG_FIXED_EXPORT(ordinal, type, name, args)
414# endif
415#endif
416
417/* The following uses const char * instead of char * for error
418 * and warning message functions, so some compilers won't complain.
419 * If you do not want to use const, define PNG_NO_CONST here.
420 *
421 * This should not change how the APIs are called, so it can be done
422 * on a per-file basis in the application.
423 */
424#ifndef PNG_CONST
425# ifndef PNG_NO_CONST
426# define PNG_CONST const
427# else
428# define PNG_CONST
429# endif
430#endif
431
432/* Some typedefs to get us started. These should be safe on most of the
433 * common platforms. The typedefs should be at least as large as the
434 * numbers suggest (a png_uint_32 must be at least 32 bits long), but they
435 * don't have to be exactly that size. Some compilers dislike passing
436 * unsigned shorts as function parameters, so you may be better off using
437 * unsigned int for png_uint_16.
438 */
439
440#if defined(INT_MAX) && (INT_MAX > 0x7ffffffeL)
441typedef unsigned int png_uint_32;
442typedef int png_int_32;
443#else
444typedef unsigned long png_uint_32;
445typedef long png_int_32;
446#endif
447typedef unsigned short png_uint_16;
448typedef short png_int_16;
449typedef unsigned char png_byte;
450
451#ifdef PNG_NO_SIZE_T
452typedef unsigned int png_size_t;
453#else
454typedef size_t png_size_t;
455#endif
456#define png_sizeof(x) (sizeof (x))
457
458/* The following is needed for medium model support. It cannot be in the
459 * pngpriv.h header. Needs modification for other compilers besides
460 * MSC. Model independent support declares all arrays and pointers to be
461 * large using the far keyword. The zlib version used must also support
462 * model independent data. As of version zlib 1.0.4, the necessary changes
463 * have been made in zlib. The USE_FAR_KEYWORD define triggers other
464 * changes that are needed. (Tim Wegner)
465 */
466
467/* Separate compiler dependencies (problem here is that zlib.h always
468 * defines FAR. (SJT)
469 */
470#ifdef __BORLANDC__
471# if defined(__LARGE__) || defined(__HUGE__) || defined(__COMPACT__)
472# define LDATA 1
473# else
474# define LDATA 0
475# endif
476 /* GRR: why is Cygwin in here? Cygwin is not Borland C... */
477# if !defined(__WIN32__) && !defined(__FLAT__) && !defined(__CYGWIN__)
478# define PNG_MAX_MALLOC_64K /* only used in build */
479# if (LDATA != 1)
480# ifndef FAR
481# define FAR __far
482# endif
483# define USE_FAR_KEYWORD
484# endif /* LDATA != 1 */
485 /* Possibly useful for moving data out of default segment.
486 * Uncomment it if you want. Could also define FARDATA as
487 * const if your compiler supports it. (SJT)
488# define FARDATA FAR
489 */
490# endif /* __WIN32__, __FLAT__, __CYGWIN__ */
491#endif /* __BORLANDC__ */
492
493
494/* Suggest testing for specific compiler first before testing for
495 * FAR. The Watcom compiler defines both __MEDIUM__ and M_I86MM,
496 * making reliance oncertain keywords suspect. (SJT)
497 */
498
499/* MSC Medium model */
500#ifdef FAR
501# ifdef M_I86MM
502# define USE_FAR_KEYWORD
503# define FARDATA FAR
504# include <dos.h>
505# endif
506#endif
507
508/* SJT: default case */
509#ifndef FAR
510# define FAR
511#endif
512
513/* At this point FAR is always defined */
514#ifndef FARDATA
515# define FARDATA
516#endif
517
518/* Typedef for floating-point numbers that are converted
519 * to fixed-point with a multiple of 100,000, e.g., gamma
520 */
521typedef png_int_32 png_fixed_point;
522
523/* Add typedefs for pointers */
524typedef void FAR * png_voidp;
525typedef PNG_CONST void FAR * png_const_voidp;
526typedef png_byte FAR * png_bytep;
527typedef PNG_CONST png_byte FAR * png_const_bytep;
528typedef png_uint_32 FAR * png_uint_32p;
529typedef PNG_CONST png_uint_32 FAR * png_const_uint_32p;
530typedef png_int_32 FAR * png_int_32p;
531typedef PNG_CONST png_int_32 FAR * png_const_int_32p;
532typedef png_uint_16 FAR * png_uint_16p;
533typedef PNG_CONST png_uint_16 FAR * png_const_uint_16p;
534typedef png_int_16 FAR * png_int_16p;
535typedef PNG_CONST png_int_16 FAR * png_const_int_16p;
536typedef char FAR * png_charp;
537typedef PNG_CONST char FAR * png_const_charp;
538typedef png_fixed_point FAR * png_fixed_point_p;
539typedef PNG_CONST png_fixed_point FAR * png_const_fixed_point_p;
540typedef png_size_t FAR * png_size_tp;
541typedef PNG_CONST png_size_t FAR * png_const_size_tp;
542
543#ifdef PNG_STDIO_SUPPORTED
544typedef FILE * png_FILE_p;
545#endif
546
547#ifdef PNG_FLOATING_POINT_SUPPORTED
548typedef double FAR * png_doublep;
549typedef PNG_CONST double FAR * png_const_doublep;
550#endif
551
552/* Pointers to pointers; i.e. arrays */
553typedef png_byte FAR * FAR * png_bytepp;
554typedef png_uint_32 FAR * FAR * png_uint_32pp;
555typedef png_int_32 FAR * FAR * png_int_32pp;
556typedef png_uint_16 FAR * FAR * png_uint_16pp;
557typedef png_int_16 FAR * FAR * png_int_16pp;
558typedef PNG_CONST char FAR * FAR * png_const_charpp;
559typedef char FAR * FAR * png_charpp;
560typedef png_fixed_point FAR * FAR * png_fixed_point_pp;
561#ifdef PNG_FLOATING_POINT_SUPPORTED
562typedef double FAR * FAR * png_doublepp;
563#endif
564
565/* Pointers to pointers to pointers; i.e., pointer to array */
566typedef char FAR * FAR * FAR * png_charppp;
567
568/* png_alloc_size_t is guaranteed to be no smaller than png_size_t,
569 * and no smaller than png_uint_32. Casts from png_size_t or png_uint_32
570 * to png_alloc_size_t are not necessary; in fact, it is recommended
571 * not to use them at all so that the compiler can complain when something
572 * turns out to be problematic.
573 * Casts in the other direction (from png_alloc_size_t to png_size_t or
574 * png_uint_32) should be explicitly applied; however, we do not expect
575 * to encounter practical situations that require such conversions.
576 */
577#if defined(__TURBOC__) && !defined(__FLAT__)
578 typedef unsigned long png_alloc_size_t;
579#else
580# if defined(_MSC_VER) && defined(MAXSEG_64K)
581 typedef unsigned long png_alloc_size_t;
582# else
583 /* This is an attempt to detect an old Windows system where (int) is
584 * actually 16 bits, in that case png_malloc must have an argument with a
585 * bigger size to accomodate the requirements of the library.
586 */
587# if (defined(_Windows) || defined(_WINDOWS) || defined(_WINDOWS_)) && \
588 (!defined(INT_MAX) || INT_MAX <= 0x7ffffffeL)
589 typedef DWORD png_alloc_size_t;
590# else
591 typedef png_size_t png_alloc_size_t;
592# endif
593# endif
594#endif
595
596#endif /* PNGCONF_H */
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