source: trunk/src/3rdparty/libpng/pngread.c@ 716

Last change on this file since 716 was 561, checked in by Dmitry A. Kuminov, 16 years ago

trunk: Merged in qt 4.6.1 sources.
File size: 45.8 KB
Line 
1
2/* pngread.c - read a PNG file
3 *
4 * Last changed in libpng 1.2.37 [June 4, 2009]
5 * Copyright (c) 1998-2009 Glenn Randers-Pehrson
6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
8 *
9 * This code is released under the libpng license.
10 * For conditions of distribution and use, see the disclaimer
11 * and license in png.h
12 *
13 * This file contains routines that an application calls directly to
14 * read a PNG file or stream.
15 */
16
17#define PNG_INTERNAL
18#include "png.h"
19#if defined(PNG_READ_SUPPORTED)
20
21/* Create a PNG structure for reading, and allocate any memory needed. */
22png_structp PNGAPI
23png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
24 png_error_ptr error_fn, png_error_ptr warn_fn)
25{
26
27#ifdef PNG_USER_MEM_SUPPORTED
28 return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn,
29 warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
30}
31
32/* Alternate create PNG structure for reading, and allocate any memory needed. */
33png_structp PNGAPI
34png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
35 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
36 png_malloc_ptr malloc_fn, png_free_ptr free_fn)
37{
38#endif /* PNG_USER_MEM_SUPPORTED */
39
40#ifdef PNG_SETJMP_SUPPORTED
41 volatile
42#endif
43 png_structp png_ptr;
44
45#ifdef PNG_SETJMP_SUPPORTED
46#ifdef USE_FAR_KEYWORD
47 jmp_buf jmpbuf;
48#endif
49#endif
50
51 int i;
52
53 png_debug(1, "in png_create_read_struct");
54#ifdef PNG_USER_MEM_SUPPORTED
55 png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
56 (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
57#else
58 png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
59#endif
60 if (png_ptr == NULL)
61 return (NULL);
62
63 /* Added at libpng-1.2.6 */
64#ifdef PNG_SET_USER_LIMITS_SUPPORTED
65 png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
66 png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
67#endif
68
69#ifdef PNG_SETJMP_SUPPORTED
70#ifdef USE_FAR_KEYWORD
71 if (setjmp(jmpbuf))
72#else
73 if (setjmp(png_ptr->jmpbuf))
74#endif
75 {
76 png_free(png_ptr, png_ptr->zbuf);
77 png_ptr->zbuf = NULL;
78#ifdef PNG_USER_MEM_SUPPORTED
79 png_destroy_struct_2((png_voidp)png_ptr,
80 (png_free_ptr)free_fn, (png_voidp)mem_ptr);
81#else
82 png_destroy_struct((png_voidp)png_ptr);
83#endif
84 return (NULL);
85 }
86#ifdef USE_FAR_KEYWORD
87 png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
88#endif
89#endif
90
91#ifdef PNG_USER_MEM_SUPPORTED
92 png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
93#endif
94
95 png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
96
97 if (user_png_ver)
98 {
99 i = 0;
100 do
101 {
102 if (user_png_ver[i] != png_libpng_ver[i])
103 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
104 } while (png_libpng_ver[i++]);
105 }
106 else
107 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
108
109
110 if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
111 {
112 /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
113 * we must recompile any applications that use any older library version.
114 * For versions after libpng 1.0, we will be compatible, so we need
115 * only check the first digit.
116 */
117 if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
118 (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
119 (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
120 {
121#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
122 char msg[80];
123 if (user_png_ver)
124 {
125 png_snprintf(msg, 80,
126 "Application was compiled with png.h from libpng-%.20s",
127 user_png_ver);
128 png_warning(png_ptr, msg);
129 }
130 png_snprintf(msg, 80,
131 "Application is running with png.c from libpng-%.20s",
132 png_libpng_ver);
133 png_warning(png_ptr, msg);
134#endif
135#ifdef PNG_ERROR_NUMBERS_SUPPORTED
136 png_ptr->flags = 0;
137#endif
138 png_error(png_ptr,
139 "Incompatible libpng version in application and library");
140 }
141 }
142
143 /* Initialize zbuf - compression buffer */
144 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
145 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
146 (png_uint_32)png_ptr->zbuf_size);
147 png_ptr->zstream.zalloc = png_zalloc;
148 png_ptr->zstream.zfree = png_zfree;
149 png_ptr->zstream.opaque = (voidpf)png_ptr;
150
151 switch (inflateInit(&png_ptr->zstream))
152 {
153 case Z_OK: /* Do nothing */ break;
154 case Z_MEM_ERROR:
155 case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break;
156 case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); break;
157 default: png_error(png_ptr, "Unknown zlib error");
158 }
159
160 png_ptr->zstream.next_out = png_ptr->zbuf;
161 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
162
163 png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
164
165#ifdef PNG_SETJMP_SUPPORTED
166/* Applications that neglect to set up their own setjmp() and then encounter
167 a png_error() will longjmp here. Since the jmpbuf is then meaningless we
168 abort instead of returning. */
169#ifdef USE_FAR_KEYWORD
170 if (setjmp(jmpbuf))
171 PNG_ABORT();
172 png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
173#else
174 if (setjmp(png_ptr->jmpbuf))
175 PNG_ABORT();
176#endif
177#endif
178 return (png_ptr);
179}
180
181#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
182/* Initialize PNG structure for reading, and allocate any memory needed.
183 This interface is deprecated in favour of the png_create_read_struct(),
184 and it will disappear as of libpng-1.3.0. */
185#undef png_read_init
186void PNGAPI
187png_read_init(png_structp png_ptr)
188{
189 /* We only come here via pre-1.0.7-compiled applications */
190 png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
191}
192
193void PNGAPI
194png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
195 png_size_t png_struct_size, png_size_t png_info_size)
196{
197 /* We only come here via pre-1.0.12-compiled applications */
198 if (png_ptr == NULL)
199 return;
200#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
201 if (png_sizeof(png_struct) > png_struct_size ||
202 png_sizeof(png_info) > png_info_size)
203 {
204 char msg[80];
205 png_ptr->warning_fn = NULL;
206 if (user_png_ver)
207 {
208 png_snprintf(msg, 80,
209 "Application was compiled with png.h from libpng-%.20s",
210 user_png_ver);
211 png_warning(png_ptr, msg);
212 }
213 png_snprintf(msg, 80,
214 "Application is running with png.c from libpng-%.20s",
215 png_libpng_ver);
216 png_warning(png_ptr, msg);
217 }
218#endif
219 if (png_sizeof(png_struct) > png_struct_size)
220 {
221 png_ptr->error_fn = NULL;
222#ifdef PNG_ERROR_NUMBERS_SUPPORTED
223 png_ptr->flags = 0;
224#endif
225 png_error(png_ptr,
226 "The png struct allocated by the application for reading is too small.");
227 }
228 if (png_sizeof(png_info) > png_info_size)
229 {
230 png_ptr->error_fn = NULL;
231#ifdef PNG_ERROR_NUMBERS_SUPPORTED
232 png_ptr->flags = 0;
233#endif
234 png_error(png_ptr,
235 "The info struct allocated by application for reading is too small.");
236 }
237 png_read_init_3(&png_ptr, user_png_ver, png_struct_size);
238}
239#endif /* PNG_1_0_X || PNG_1_2_X */
240
241void PNGAPI
242png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
243 png_size_t png_struct_size)
244{
245#ifdef PNG_SETJMP_SUPPORTED
246 jmp_buf tmp_jmp; /* to save current jump buffer */
247#endif
248
249 int i = 0;
250
251 png_structp png_ptr=*ptr_ptr;
252
253 if (png_ptr == NULL)
254 return;
255
256 do
257 {
258 if (user_png_ver[i] != png_libpng_ver[i])
259 {
260#ifdef PNG_LEGACY_SUPPORTED
261 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
262#else
263 png_ptr->warning_fn = NULL;
264 png_warning(png_ptr,
265 "Application uses deprecated png_read_init() and should be recompiled.");
266 break;
267#endif
268 }
269 } while (png_libpng_ver[i++]);
270
271 png_debug(1, "in png_read_init_3");
272
273#ifdef PNG_SETJMP_SUPPORTED
274 /* Save jump buffer and error functions */
275 png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
276#endif
277
278 if (png_sizeof(png_struct) > png_struct_size)
279 {
280 png_destroy_struct(png_ptr);
281 *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
282 png_ptr = *ptr_ptr;
283 }
284
285 /* Reset all variables to 0 */
286 png_memset(png_ptr, 0, png_sizeof(png_struct));
287
288#ifdef PNG_SETJMP_SUPPORTED
289 /* Restore jump buffer */
290 png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
291#endif
292
293 /* Added at libpng-1.2.6 */
294#ifdef PNG_SET_USER_LIMITS_SUPPORTED
295 png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
296 png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
297#endif
298
299 /* Initialize zbuf - compression buffer */
300 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
301 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
302 (png_uint_32)png_ptr->zbuf_size);
303 png_ptr->zstream.zalloc = png_zalloc;
304 png_ptr->zstream.zfree = png_zfree;
305 png_ptr->zstream.opaque = (voidpf)png_ptr;
306
307 switch (inflateInit(&png_ptr->zstream))
308 {
309 case Z_OK: /* Do nothing */ break;
310 case Z_MEM_ERROR:
311 case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory"); break;
312 case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); break;
313 default: png_error(png_ptr, "Unknown zlib error");
314 }
315
316 png_ptr->zstream.next_out = png_ptr->zbuf;
317 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
318
319 png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
320}
321
322#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
323/* Read the information before the actual image data. This has been
324 * changed in v0.90 to allow reading a file that already has the magic
325 * bytes read from the stream. You can tell libpng how many bytes have
326 * been read from the beginning of the stream (up to the maximum of 8)
327 * via png_set_sig_bytes(), and we will only check the remaining bytes
328 * here. The application can then have access to the signature bytes we
329 * read if it is determined that this isn't a valid PNG file.
330 */
331void PNGAPI
332png_read_info(png_structp png_ptr, png_infop info_ptr)
333{
334 if (png_ptr == NULL || info_ptr == NULL)
335 return;
336 png_debug(1, "in png_read_info");
337 /* If we haven't checked all of the PNG signature bytes, do so now. */
338 if (png_ptr->sig_bytes < 8)
339 {
340 png_size_t num_checked = png_ptr->sig_bytes,
341 num_to_check = 8 - num_checked;
342
343 png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check);
344 png_ptr->sig_bytes = 8;
345
346 if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
347 {
348 if (num_checked < 4 &&
349 png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
350 png_error(png_ptr, "Not a PNG file");
351 else
352 png_error(png_ptr, "PNG file corrupted by ASCII conversion");
353 }
354 if (num_checked < 3)
355 png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
356 }
357
358 for (;;)
359 {
360#ifdef PNG_USE_LOCAL_ARRAYS
361 PNG_CONST PNG_IHDR;
362 PNG_CONST PNG_IDAT;
363 PNG_CONST PNG_IEND;
364 PNG_CONST PNG_PLTE;
365#if defined(PNG_READ_bKGD_SUPPORTED)
366 PNG_CONST PNG_bKGD;
367#endif
368#if defined(PNG_READ_cHRM_SUPPORTED)
369 PNG_CONST PNG_cHRM;
370#endif
371#if defined(PNG_READ_gAMA_SUPPORTED)
372 PNG_CONST PNG_gAMA;
373#endif
374#if defined(PNG_READ_hIST_SUPPORTED)
375 PNG_CONST PNG_hIST;
376#endif
377#if defined(PNG_READ_iCCP_SUPPORTED)
378 PNG_CONST PNG_iCCP;
379#endif
380#if defined(PNG_READ_iTXt_SUPPORTED)
381 PNG_CONST PNG_iTXt;
382#endif
383#if defined(PNG_READ_oFFs_SUPPORTED)
384 PNG_CONST PNG_oFFs;
385#endif
386#if defined(PNG_READ_pCAL_SUPPORTED)
387 PNG_CONST PNG_pCAL;
388#endif
389#if defined(PNG_READ_pHYs_SUPPORTED)
390 PNG_CONST PNG_pHYs;
391#endif
392#if defined(PNG_READ_sBIT_SUPPORTED)
393 PNG_CONST PNG_sBIT;
394#endif
395#if defined(PNG_READ_sCAL_SUPPORTED)
396 PNG_CONST PNG_sCAL;
397#endif
398#if defined(PNG_READ_sPLT_SUPPORTED)
399 PNG_CONST PNG_sPLT;
400#endif
401#if defined(PNG_READ_sRGB_SUPPORTED)
402 PNG_CONST PNG_sRGB;
403#endif
404#if defined(PNG_READ_tEXt_SUPPORTED)
405 PNG_CONST PNG_tEXt;
406#endif
407#if defined(PNG_READ_tIME_SUPPORTED)
408 PNG_CONST PNG_tIME;
409#endif
410#if defined(PNG_READ_tRNS_SUPPORTED)
411 PNG_CONST PNG_tRNS;
412#endif
413#if defined(PNG_READ_zTXt_SUPPORTED)
414 PNG_CONST PNG_zTXt;
415#endif
416#endif /* PNG_USE_LOCAL_ARRAYS */
417 png_uint_32 length = png_read_chunk_header(png_ptr);
418 PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
419
420 /* This should be a binary subdivision search or a hash for
421 * matching the chunk name rather than a linear search.
422 */
423 if (!png_memcmp(chunk_name, png_IDAT, 4))
424 if (png_ptr->mode & PNG_AFTER_IDAT)
425 png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
426
427 if (!png_memcmp(chunk_name, png_IHDR, 4))
428 png_handle_IHDR(png_ptr, info_ptr, length);
429 else if (!png_memcmp(chunk_name, png_IEND, 4))
430 png_handle_IEND(png_ptr, info_ptr, length);
431#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
432 else if (png_handle_as_unknown(png_ptr, chunk_name))
433 {
434 if (!png_memcmp(chunk_name, png_IDAT, 4))
435 png_ptr->mode |= PNG_HAVE_IDAT;
436 png_handle_unknown(png_ptr, info_ptr, length);
437 if (!png_memcmp(chunk_name, png_PLTE, 4))
438 png_ptr->mode |= PNG_HAVE_PLTE;
439 else if (!png_memcmp(chunk_name, png_IDAT, 4))
440 {
441 if (!(png_ptr->mode & PNG_HAVE_IHDR))
442 png_error(png_ptr, "Missing IHDR before IDAT");
443 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
444 !(png_ptr->mode & PNG_HAVE_PLTE))
445 png_error(png_ptr, "Missing PLTE before IDAT");
446 break;
447 }
448 }
449#endif
450 else if (!png_memcmp(chunk_name, png_PLTE, 4))
451 png_handle_PLTE(png_ptr, info_ptr, length);
452 else if (!png_memcmp(chunk_name, png_IDAT, 4))
453 {
454 if (!(png_ptr->mode & PNG_HAVE_IHDR))
455 png_error(png_ptr, "Missing IHDR before IDAT");
456 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
457 !(png_ptr->mode & PNG_HAVE_PLTE))
458 png_error(png_ptr, "Missing PLTE before IDAT");
459
460 png_ptr->idat_size = length;
461 png_ptr->mode |= PNG_HAVE_IDAT;
462 break;
463 }
464#if defined(PNG_READ_bKGD_SUPPORTED)
465 else if (!png_memcmp(chunk_name, png_bKGD, 4))
466 png_handle_bKGD(png_ptr, info_ptr, length);
467#endif
468#if defined(PNG_READ_cHRM_SUPPORTED)
469 else if (!png_memcmp(chunk_name, png_cHRM, 4))
470 png_handle_cHRM(png_ptr, info_ptr, length);
471#endif
472#if defined(PNG_READ_gAMA_SUPPORTED)
473 else if (!png_memcmp(chunk_name, png_gAMA, 4))
474 png_handle_gAMA(png_ptr, info_ptr, length);
475#endif
476#if defined(PNG_READ_hIST_SUPPORTED)
477 else if (!png_memcmp(chunk_name, png_hIST, 4))
478 png_handle_hIST(png_ptr, info_ptr, length);
479#endif
480#if defined(PNG_READ_oFFs_SUPPORTED)
481 else if (!png_memcmp(chunk_name, png_oFFs, 4))
482 png_handle_oFFs(png_ptr, info_ptr, length);
483#endif
484#if defined(PNG_READ_pCAL_SUPPORTED)
485 else if (!png_memcmp(chunk_name, png_pCAL, 4))
486 png_handle_pCAL(png_ptr, info_ptr, length);
487#endif
488#if defined(PNG_READ_sCAL_SUPPORTED)
489 else if (!png_memcmp(chunk_name, png_sCAL, 4))
490 png_handle_sCAL(png_ptr, info_ptr, length);
491#endif
492#if defined(PNG_READ_pHYs_SUPPORTED)
493 else if (!png_memcmp(chunk_name, png_pHYs, 4))
494 png_handle_pHYs(png_ptr, info_ptr, length);
495#endif
496#if defined(PNG_READ_sBIT_SUPPORTED)
497 else if (!png_memcmp(chunk_name, png_sBIT, 4))
498 png_handle_sBIT(png_ptr, info_ptr, length);
499#endif
500#if defined(PNG_READ_sRGB_SUPPORTED)
501 else if (!png_memcmp(chunk_name, png_sRGB, 4))
502 png_handle_sRGB(png_ptr, info_ptr, length);
503#endif
504#if defined(PNG_READ_iCCP_SUPPORTED)
505 else if (!png_memcmp(chunk_name, png_iCCP, 4))
506 png_handle_iCCP(png_ptr, info_ptr, length);
507#endif
508#if defined(PNG_READ_sPLT_SUPPORTED)
509 else if (!png_memcmp(chunk_name, png_sPLT, 4))
510 png_handle_sPLT(png_ptr, info_ptr, length);
511#endif
512#if defined(PNG_READ_tEXt_SUPPORTED)
513 else if (!png_memcmp(chunk_name, png_tEXt, 4))
514 png_handle_tEXt(png_ptr, info_ptr, length);
515#endif
516#if defined(PNG_READ_tIME_SUPPORTED)
517 else if (!png_memcmp(chunk_name, png_tIME, 4))
518 png_handle_tIME(png_ptr, info_ptr, length);
519#endif
520#if defined(PNG_READ_tRNS_SUPPORTED)
521 else if (!png_memcmp(chunk_name, png_tRNS, 4))
522 png_handle_tRNS(png_ptr, info_ptr, length);
523#endif
524#if defined(PNG_READ_zTXt_SUPPORTED)
525 else if (!png_memcmp(chunk_name, png_zTXt, 4))
526 png_handle_zTXt(png_ptr, info_ptr, length);
527#endif
528#if defined(PNG_READ_iTXt_SUPPORTED)
529 else if (!png_memcmp(chunk_name, png_iTXt, 4))
530 png_handle_iTXt(png_ptr, info_ptr, length);
531#endif
532 else
533 png_handle_unknown(png_ptr, info_ptr, length);
534 }
535}
536#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
537
538/* Optional call to update the users info_ptr structure */
539void PNGAPI
540png_read_update_info(png_structp png_ptr, png_infop info_ptr)
541{
542 png_debug(1, "in png_read_update_info");
543 if (png_ptr == NULL)
544 return;
545 if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
546 png_read_start_row(png_ptr);
547 else
548 png_warning(png_ptr,
549 "Ignoring extra png_read_update_info() call; row buffer not reallocated");
550 png_read_transform_info(png_ptr, info_ptr);
551}
552
553#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
554/* Initialize palette, background, etc, after transformations
555 * are set, but before any reading takes place. This allows
556 * the user to obtain a gamma-corrected palette, for example.
557 * If the user doesn't call this, we will do it ourselves.
558 */
559void PNGAPI
560png_start_read_image(png_structp png_ptr)
561{
562 png_debug(1, "in png_start_read_image");
563 if (png_ptr == NULL)
564 return;
565 if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
566 png_read_start_row(png_ptr);
567}
568#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
569
570#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
571void PNGAPI
572png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
573{
574#ifdef PNG_USE_LOCAL_ARRAYS
575 PNG_CONST PNG_IDAT;
576 PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
577 0xff};
578 PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
579#endif
580 int ret;
581 if (png_ptr == NULL)
582 return;
583 png_debug2(1, "in png_read_row (row %lu, pass %d)",
584 png_ptr->row_number, png_ptr->pass);
585 if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
586 png_read_start_row(png_ptr);
587 if (png_ptr->row_number == 0 && png_ptr->pass == 0)
588 {
589 /* Check for transforms that have been set but were defined out */
590#if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED)
591 if (png_ptr->transformations & PNG_INVERT_MONO)
592 png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined.");
593#endif
594#if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED)
595 if (png_ptr->transformations & PNG_FILLER)
596 png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined.");
597#endif
598#if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && !defined(PNG_READ_PACKSWAP_SUPPORTED)
599 if (png_ptr->transformations & PNG_PACKSWAP)
600 png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined.");
601#endif
602#if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED)
603 if (png_ptr->transformations & PNG_PACK)
604 png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined.");
605#endif
606#if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED)
607 if (png_ptr->transformations & PNG_SHIFT)
608 png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined.");
609#endif
610#if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED)
611 if (png_ptr->transformations & PNG_BGR)
612 png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined.");
613#endif
614#if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED)
615 if (png_ptr->transformations & PNG_SWAP_BYTES)
616 png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined.");
617#endif
618 }
619
620#if defined(PNG_READ_INTERLACING_SUPPORTED)
621 /* If interlaced and we do not need a new row, combine row and return */
622 if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
623 {
624 switch (png_ptr->pass)
625 {
626 case 0:
627 if (png_ptr->row_number & 0x07)
628 {
629 if (dsp_row != NULL)
630 png_combine_row(png_ptr, dsp_row,
631 png_pass_dsp_mask[png_ptr->pass]);
632 png_read_finish_row(png_ptr);
633 return;
634 }
635 break;
636 case 1:
637 if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
638 {
639 if (dsp_row != NULL)
640 png_combine_row(png_ptr, dsp_row,
641 png_pass_dsp_mask[png_ptr->pass]);
642 png_read_finish_row(png_ptr);
643 return;
644 }
645 break;
646 case 2:
647 if ((png_ptr->row_number & 0x07) != 4)
648 {
649 if (dsp_row != NULL && (png_ptr->row_number & 4))
650 png_combine_row(png_ptr, dsp_row,
651 png_pass_dsp_mask[png_ptr->pass]);
652 png_read_finish_row(png_ptr);
653 return;
654 }
655 break;
656 case 3:
657 if ((png_ptr->row_number & 3) || png_ptr->width < 3)
658 {
659 if (dsp_row != NULL)
660 png_combine_row(png_ptr, dsp_row,
661 png_pass_dsp_mask[png_ptr->pass]);
662 png_read_finish_row(png_ptr);
663 return;
664 }
665 break;
666 case 4:
667 if ((png_ptr->row_number & 3) != 2)
668 {
669 if (dsp_row != NULL && (png_ptr->row_number & 2))
670 png_combine_row(png_ptr, dsp_row,
671 png_pass_dsp_mask[png_ptr->pass]);
672 png_read_finish_row(png_ptr);
673 return;
674 }
675 break;
676 case 5:
677 if ((png_ptr->row_number & 1) || png_ptr->width < 2)
678 {
679 if (dsp_row != NULL)
680 png_combine_row(png_ptr, dsp_row,
681 png_pass_dsp_mask[png_ptr->pass]);
682 png_read_finish_row(png_ptr);
683 return;
684 }
685 break;
686 case 6:
687 if (!(png_ptr->row_number & 1))
688 {
689 png_read_finish_row(png_ptr);
690 return;
691 }
692 break;
693 }
694 }
695#endif
696
697 if (!(png_ptr->mode & PNG_HAVE_IDAT))
698 png_error(png_ptr, "Invalid attempt to read row data");
699
700 png_ptr->zstream.next_out = png_ptr->row_buf;
701 png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
702 do
703 {
704 if (!(png_ptr->zstream.avail_in))
705 {
706 while (!png_ptr->idat_size)
707 {
708 png_crc_finish(png_ptr, 0);
709
710 png_ptr->idat_size = png_read_chunk_header(png_ptr);
711 if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
712 png_error(png_ptr, "Not enough image data");
713 }
714 png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size;
715 png_ptr->zstream.next_in = png_ptr->zbuf;
716 if (png_ptr->zbuf_size > png_ptr->idat_size)
717 png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size;
718 png_crc_read(png_ptr, png_ptr->zbuf,
719 (png_size_t)png_ptr->zstream.avail_in);
720 png_ptr->idat_size -= png_ptr->zstream.avail_in;
721 }
722 ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
723 if (ret == Z_STREAM_END)
724 {
725 if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in ||
726 png_ptr->idat_size)
727 png_error(png_ptr, "Extra compressed data");
728 png_ptr->mode |= PNG_AFTER_IDAT;
729 png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
730 break;
731 }
732 if (ret != Z_OK)
733 png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :
734 "Decompression error");
735
736 } while (png_ptr->zstream.avail_out);
737
738 png_ptr->row_info.color_type = png_ptr->color_type;
739 png_ptr->row_info.width = png_ptr->iwidth;
740 png_ptr->row_info.channels = png_ptr->channels;
741 png_ptr->row_info.bit_depth = png_ptr->bit_depth;
742 png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
743 png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
744 png_ptr->row_info.width);
745
746 if (png_ptr->row_buf[0])
747 png_read_filter_row(png_ptr, &(png_ptr->row_info),
748 png_ptr->row_buf + 1, png_ptr->prev_row + 1,
749 (int)(png_ptr->row_buf[0]));
750
751 png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
752 png_ptr->rowbytes + 1);
753
754#if defined(PNG_MNG_FEATURES_SUPPORTED)
755 if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
756 (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
757 {
758 /* Intrapixel differencing */
759 png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
760 }
761#endif
762
763
764 if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
765 png_do_read_transformations(png_ptr);
766
767#if defined(PNG_READ_INTERLACING_SUPPORTED)
768 /* Blow up interlaced rows to full size */
769 if (png_ptr->interlaced &&
770 (png_ptr->transformations & PNG_INTERLACE))
771 {
772 if (png_ptr->pass < 6)
773 /* Old interface (pre-1.0.9):
774 * png_do_read_interlace(&(png_ptr->row_info),
775 * png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
776 */
777 png_do_read_interlace(png_ptr);
778
779 if (dsp_row != NULL)
780 png_combine_row(png_ptr, dsp_row,
781 png_pass_dsp_mask[png_ptr->pass]);
782 if (row != NULL)
783 png_combine_row(png_ptr, row,
784 png_pass_mask[png_ptr->pass]);
785 }
786 else
787#endif
788 {
789 if (row != NULL)
790 png_combine_row(png_ptr, row, 0xff);
791 if (dsp_row != NULL)
792 png_combine_row(png_ptr, dsp_row, 0xff);
793 }
794 png_read_finish_row(png_ptr);
795
796 if (png_ptr->read_row_fn != NULL)
797 (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
798}
799#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
800
801#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
802/* Read one or more rows of image data. If the image is interlaced,
803 * and png_set_interlace_handling() has been called, the rows need to
804 * contain the contents of the rows from the previous pass. If the
805 * image has alpha or transparency, and png_handle_alpha()[*] has been
806 * called, the rows contents must be initialized to the contents of the
807 * screen.
808 *
809 * "row" holds the actual image, and pixels are placed in it
810 * as they arrive. If the image is displayed after each pass, it will
811 * appear to "sparkle" in. "display_row" can be used to display a
812 * "chunky" progressive image, with finer detail added as it becomes
813 * available. If you do not want this "chunky" display, you may pass
814 * NULL for display_row. If you do not want the sparkle display, and
815 * you have not called png_handle_alpha(), you may pass NULL for rows.
816 * If you have called png_handle_alpha(), and the image has either an
817 * alpha channel or a transparency chunk, you must provide a buffer for
818 * rows. In this case, you do not have to provide a display_row buffer
819 * also, but you may. If the image is not interlaced, or if you have
820 * not called png_set_interlace_handling(), the display_row buffer will
821 * be ignored, so pass NULL to it.
822 *
823 * [*] png_handle_alpha() does not exist yet, as of this version of libpng
824 */
825
826void PNGAPI
827png_read_rows(png_structp png_ptr, png_bytepp row,
828 png_bytepp display_row, png_uint_32 num_rows)
829{
830 png_uint_32 i;
831 png_bytepp rp;
832 png_bytepp dp;
833
834 png_debug(1, "in png_read_rows");
835 if (png_ptr == NULL)
836 return;
837 rp = row;
838 dp = display_row;
839 if (rp != NULL && dp != NULL)
840 for (i = 0; i < num_rows; i++)
841 {
842 png_bytep rptr = *rp++;
843 png_bytep dptr = *dp++;
844
845 png_read_row(png_ptr, rptr, dptr);
846 }
847 else if (rp != NULL)
848 for (i = 0; i < num_rows; i++)
849 {
850 png_bytep rptr = *rp;
851 png_read_row(png_ptr, rptr, png_bytep_NULL);
852 rp++;
853 }
854 else if (dp != NULL)
855 for (i = 0; i < num_rows; i++)
856 {
857 png_bytep dptr = *dp;
858 png_read_row(png_ptr, png_bytep_NULL, dptr);
859 dp++;
860 }
861}
862#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
863
864#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
865/* Read the entire image. If the image has an alpha channel or a tRNS
866 * chunk, and you have called png_handle_alpha()[*], you will need to
867 * initialize the image to the current image that PNG will be overlaying.
868 * We set the num_rows again here, in case it was incorrectly set in
869 * png_read_start_row() by a call to png_read_update_info() or
870 * png_start_read_image() if png_set_interlace_handling() wasn't called
871 * prior to either of these functions like it should have been. You can
872 * only call this function once. If you desire to have an image for
873 * each pass of a interlaced image, use png_read_rows() instead.
874 *
875 * [*] png_handle_alpha() does not exist yet, as of this version of libpng
876 */
877void PNGAPI
878png_read_image(png_structp png_ptr, png_bytepp image)
879{
880 png_uint_32 i, image_height;
881 int pass, j;
882 png_bytepp rp;
883
884 png_debug(1, "in png_read_image");
885 if (png_ptr == NULL)
886 return;
887
888#ifdef PNG_READ_INTERLACING_SUPPORTED
889 pass = png_set_interlace_handling(png_ptr);
890#else
891 if (png_ptr->interlaced)
892 png_error(png_ptr,
893 "Cannot read interlaced image -- interlace handler disabled.");
894 pass = 1;
895#endif
896
897
898 image_height=png_ptr->height;
899 png_ptr->num_rows = image_height; /* Make sure this is set correctly */
900
901 for (j = 0; j < pass; j++)
902 {
903 rp = image;
904 for (i = 0; i < image_height; i++)
905 {
906 png_read_row(png_ptr, *rp, png_bytep_NULL);
907 rp++;
908 }
909 }
910}
911#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
912
913#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
914/* Read the end of the PNG file. Will not read past the end of the
915 * file, will verify the end is accurate, and will read any comments
916 * or time information at the end of the file, if info is not NULL.
917 */
918void PNGAPI
919png_read_end(png_structp png_ptr, png_infop info_ptr)
920{
921 png_debug(1, "in png_read_end");
922 if (png_ptr == NULL)
923 return;
924 png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */
925
926 do
927 {
928#ifdef PNG_USE_LOCAL_ARRAYS
929 PNG_CONST PNG_IHDR;
930 PNG_CONST PNG_IDAT;
931 PNG_CONST PNG_IEND;
932 PNG_CONST PNG_PLTE;
933#if defined(PNG_READ_bKGD_SUPPORTED)
934 PNG_CONST PNG_bKGD;
935#endif
936#if defined(PNG_READ_cHRM_SUPPORTED)
937 PNG_CONST PNG_cHRM;
938#endif
939#if defined(PNG_READ_gAMA_SUPPORTED)
940 PNG_CONST PNG_gAMA;
941#endif
942#if defined(PNG_READ_hIST_SUPPORTED)
943 PNG_CONST PNG_hIST;
944#endif
945#if defined(PNG_READ_iCCP_SUPPORTED)
946 PNG_CONST PNG_iCCP;
947#endif
948#if defined(PNG_READ_iTXt_SUPPORTED)
949 PNG_CONST PNG_iTXt;
950#endif
951#if defined(PNG_READ_oFFs_SUPPORTED)
952 PNG_CONST PNG_oFFs;
953#endif
954#if defined(PNG_READ_pCAL_SUPPORTED)
955 PNG_CONST PNG_pCAL;
956#endif
957#if defined(PNG_READ_pHYs_SUPPORTED)
958 PNG_CONST PNG_pHYs;
959#endif
960#if defined(PNG_READ_sBIT_SUPPORTED)
961 PNG_CONST PNG_sBIT;
962#endif
963#if defined(PNG_READ_sCAL_SUPPORTED)
964 PNG_CONST PNG_sCAL;
965#endif
966#if defined(PNG_READ_sPLT_SUPPORTED)
967 PNG_CONST PNG_sPLT;
968#endif
969#if defined(PNG_READ_sRGB_SUPPORTED)
970 PNG_CONST PNG_sRGB;
971#endif
972#if defined(PNG_READ_tEXt_SUPPORTED)
973 PNG_CONST PNG_tEXt;
974#endif
975#if defined(PNG_READ_tIME_SUPPORTED)
976 PNG_CONST PNG_tIME;
977#endif
978#if defined(PNG_READ_tRNS_SUPPORTED)
979 PNG_CONST PNG_tRNS;
980#endif
981#if defined(PNG_READ_zTXt_SUPPORTED)
982 PNG_CONST PNG_zTXt;
983#endif
984#endif /* PNG_USE_LOCAL_ARRAYS */
985 png_uint_32 length = png_read_chunk_header(png_ptr);
986 PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
987
988 if (!png_memcmp(chunk_name, png_IHDR, 4))
989 png_handle_IHDR(png_ptr, info_ptr, length);
990 else if (!png_memcmp(chunk_name, png_IEND, 4))
991 png_handle_IEND(png_ptr, info_ptr, length);
992#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
993 else if (png_handle_as_unknown(png_ptr, chunk_name))
994 {
995 if (!png_memcmp(chunk_name, png_IDAT, 4))
996 {
997 if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
998 png_error(png_ptr, "Too many IDAT's found");
999 }
1000 png_handle_unknown(png_ptr, info_ptr, length);
1001 if (!png_memcmp(chunk_name, png_PLTE, 4))
1002 png_ptr->mode |= PNG_HAVE_PLTE;
1003 }
1004#endif
1005 else if (!png_memcmp(chunk_name, png_IDAT, 4))
1006 {
1007 /* Zero length IDATs are legal after the last IDAT has been
1008 * read, but not after other chunks have been read.
1009 */
1010 if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
1011 png_error(png_ptr, "Too many IDAT's found");
1012 png_crc_finish(png_ptr, length);
1013 }
1014 else if (!png_memcmp(chunk_name, png_PLTE, 4))
1015 png_handle_PLTE(png_ptr, info_ptr, length);
1016#if defined(PNG_READ_bKGD_SUPPORTED)
1017 else if (!png_memcmp(chunk_name, png_bKGD, 4))
1018 png_handle_bKGD(png_ptr, info_ptr, length);
1019#endif
1020#if defined(PNG_READ_cHRM_SUPPORTED)
1021 else if (!png_memcmp(chunk_name, png_cHRM, 4))
1022 png_handle_cHRM(png_ptr, info_ptr, length);
1023#endif
1024#if defined(PNG_READ_gAMA_SUPPORTED)
1025 else if (!png_memcmp(chunk_name, png_gAMA, 4))
1026 png_handle_gAMA(png_ptr, info_ptr, length);
1027#endif
1028#if defined(PNG_READ_hIST_SUPPORTED)
1029 else if (!png_memcmp(chunk_name, png_hIST, 4))
1030 png_handle_hIST(png_ptr, info_ptr, length);
1031#endif
1032#if defined(PNG_READ_oFFs_SUPPORTED)
1033 else if (!png_memcmp(chunk_name, png_oFFs, 4))
1034 png_handle_oFFs(png_ptr, info_ptr, length);
1035#endif
1036#if defined(PNG_READ_pCAL_SUPPORTED)
1037 else if (!png_memcmp(chunk_name, png_pCAL, 4))
1038 png_handle_pCAL(png_ptr, info_ptr, length);
1039#endif
1040#if defined(PNG_READ_sCAL_SUPPORTED)
1041 else if (!png_memcmp(chunk_name, png_sCAL, 4))
1042 png_handle_sCAL(png_ptr, info_ptr, length);
1043#endif
1044#if defined(PNG_READ_pHYs_SUPPORTED)
1045 else if (!png_memcmp(chunk_name, png_pHYs, 4))
1046 png_handle_pHYs(png_ptr, info_ptr, length);
1047#endif
1048#if defined(PNG_READ_sBIT_SUPPORTED)
1049 else if (!png_memcmp(chunk_name, png_sBIT, 4))
1050 png_handle_sBIT(png_ptr, info_ptr, length);
1051#endif
1052#if defined(PNG_READ_sRGB_SUPPORTED)
1053 else if (!png_memcmp(chunk_name, png_sRGB, 4))
1054 png_handle_sRGB(png_ptr, info_ptr, length);
1055#endif
1056#if defined(PNG_READ_iCCP_SUPPORTED)
1057 else if (!png_memcmp(chunk_name, png_iCCP, 4))
1058 png_handle_iCCP(png_ptr, info_ptr, length);
1059#endif
1060#if defined(PNG_READ_sPLT_SUPPORTED)
1061 else if (!png_memcmp(chunk_name, png_sPLT, 4))
1062 png_handle_sPLT(png_ptr, info_ptr, length);
1063#endif
1064#if defined(PNG_READ_tEXt_SUPPORTED)
1065 else if (!png_memcmp(chunk_name, png_tEXt, 4))
1066 png_handle_tEXt(png_ptr, info_ptr, length);
1067#endif
1068#if defined(PNG_READ_tIME_SUPPORTED)
1069 else if (!png_memcmp(chunk_name, png_tIME, 4))
1070 png_handle_tIME(png_ptr, info_ptr, length);
1071#endif
1072#if defined(PNG_READ_tRNS_SUPPORTED)
1073 else if (!png_memcmp(chunk_name, png_tRNS, 4))
1074 png_handle_tRNS(png_ptr, info_ptr, length);
1075#endif
1076#if defined(PNG_READ_zTXt_SUPPORTED)
1077 else if (!png_memcmp(chunk_name, png_zTXt, 4))
1078 png_handle_zTXt(png_ptr, info_ptr, length);
1079#endif
1080#if defined(PNG_READ_iTXt_SUPPORTED)
1081 else if (!png_memcmp(chunk_name, png_iTXt, 4))
1082 png_handle_iTXt(png_ptr, info_ptr, length);
1083#endif
1084 else
1085 png_handle_unknown(png_ptr, info_ptr, length);
1086 } while (!(png_ptr->mode & PNG_HAVE_IEND));
1087}
1088#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
1089
1090/* Free all memory used by the read */
1091void PNGAPI
1092png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
1093 png_infopp end_info_ptr_ptr)
1094{
1095 png_structp png_ptr = NULL;
1096 png_infop info_ptr = NULL, end_info_ptr = NULL;
1097#ifdef PNG_USER_MEM_SUPPORTED
1098 png_free_ptr free_fn = NULL;
1099 png_voidp mem_ptr = NULL;
1100#endif
1101
1102 png_debug(1, "in png_destroy_read_struct");
1103 if (png_ptr_ptr != NULL)
1104 png_ptr = *png_ptr_ptr;
1105 if (png_ptr == NULL)
1106 return;
1107
1108#ifdef PNG_USER_MEM_SUPPORTED
1109 free_fn = png_ptr->free_fn;
1110 mem_ptr = png_ptr->mem_ptr;
1111#endif
1112
1113 if (info_ptr_ptr != NULL)
1114 info_ptr = *info_ptr_ptr;
1115
1116 if (end_info_ptr_ptr != NULL)
1117 end_info_ptr = *end_info_ptr_ptr;
1118
1119 png_read_destroy(png_ptr, info_ptr, end_info_ptr);
1120
1121 if (info_ptr != NULL)
1122 {
1123#if defined(PNG_TEXT_SUPPORTED)
1124 png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1);
1125#endif
1126
1127#ifdef PNG_USER_MEM_SUPPORTED
1128 png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
1129 (png_voidp)mem_ptr);
1130#else
1131 png_destroy_struct((png_voidp)info_ptr);
1132#endif
1133 *info_ptr_ptr = NULL;
1134 }
1135
1136 if (end_info_ptr != NULL)
1137 {
1138#if defined(PNG_READ_TEXT_SUPPORTED)
1139 png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1);
1140#endif
1141#ifdef PNG_USER_MEM_SUPPORTED
1142 png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn,
1143 (png_voidp)mem_ptr);
1144#else
1145 png_destroy_struct((png_voidp)end_info_ptr);
1146#endif
1147 *end_info_ptr_ptr = NULL;
1148 }
1149
1150 if (png_ptr != NULL)
1151 {
1152#ifdef PNG_USER_MEM_SUPPORTED
1153 png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
1154 (png_voidp)mem_ptr);
1155#else
1156 png_destroy_struct((png_voidp)png_ptr);
1157#endif
1158 *png_ptr_ptr = NULL;
1159 }
1160}
1161
1162/* Free all memory used by the read (old method) */
1163void /* PRIVATE */
1164png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr)
1165{
1166#ifdef PNG_SETJMP_SUPPORTED
1167 jmp_buf tmp_jmp;
1168#endif
1169 png_error_ptr error_fn;
1170 png_error_ptr warning_fn;
1171 png_voidp error_ptr;
1172#ifdef PNG_USER_MEM_SUPPORTED
1173 png_free_ptr free_fn;
1174#endif
1175
1176 png_debug(1, "in png_read_destroy");
1177 if (info_ptr != NULL)
1178 png_info_destroy(png_ptr, info_ptr);
1179
1180 if (end_info_ptr != NULL)
1181 png_info_destroy(png_ptr, end_info_ptr);
1182
1183 png_free(png_ptr, png_ptr->zbuf);
1184 png_free(png_ptr, png_ptr->big_row_buf);
1185 png_free(png_ptr, png_ptr->prev_row);
1186 png_free(png_ptr, png_ptr->chunkdata);
1187#if defined(PNG_READ_DITHER_SUPPORTED)
1188 png_free(png_ptr, png_ptr->palette_lookup);
1189 png_free(png_ptr, png_ptr->dither_index);
1190#endif
1191#if defined(PNG_READ_GAMMA_SUPPORTED)
1192 png_free(png_ptr, png_ptr->gamma_table);
1193#endif
1194#if defined(PNG_READ_BACKGROUND_SUPPORTED)
1195 png_free(png_ptr, png_ptr->gamma_from_1);
1196 png_free(png_ptr, png_ptr->gamma_to_1);
1197#endif
1198#ifdef PNG_FREE_ME_SUPPORTED
1199 if (png_ptr->free_me & PNG_FREE_PLTE)
1200 png_zfree(png_ptr, png_ptr->palette);
1201 png_ptr->free_me &= ~PNG_FREE_PLTE;
1202#else
1203 if (png_ptr->flags & PNG_FLAG_FREE_PLTE)
1204 png_zfree(png_ptr, png_ptr->palette);
1205 png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
1206#endif
1207#if defined(PNG_tRNS_SUPPORTED) || \
1208 defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1209#ifdef PNG_FREE_ME_SUPPORTED
1210 if (png_ptr->free_me & PNG_FREE_TRNS)
1211 png_free(png_ptr, png_ptr->trans);
1212 png_ptr->free_me &= ~PNG_FREE_TRNS;
1213#else
1214 if (png_ptr->flags & PNG_FLAG_FREE_TRNS)
1215 png_free(png_ptr, png_ptr->trans);
1216 png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
1217#endif
1218#endif
1219#if defined(PNG_READ_hIST_SUPPORTED)
1220#ifdef PNG_FREE_ME_SUPPORTED
1221 if (png_ptr->free_me & PNG_FREE_HIST)
1222 png_free(png_ptr, png_ptr->hist);
1223 png_ptr->free_me &= ~PNG_FREE_HIST;
1224#else
1225 if (png_ptr->flags & PNG_FLAG_FREE_HIST)
1226 png_free(png_ptr, png_ptr->hist);
1227 png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
1228#endif
1229#endif
1230#if defined(PNG_READ_GAMMA_SUPPORTED)
1231 if (png_ptr->gamma_16_table != NULL)
1232 {
1233 int i;
1234 int istop = (1 << (8 - png_ptr->gamma_shift));
1235 for (i = 0; i < istop; i++)
1236 {
1237 png_free(png_ptr, png_ptr->gamma_16_table[i]);
1238 }
1239 png_free(png_ptr, png_ptr->gamma_16_table);
1240 }
1241#if defined(PNG_READ_BACKGROUND_SUPPORTED)
1242 if (png_ptr->gamma_16_from_1 != NULL)
1243 {
1244 int i;
1245 int istop = (1 << (8 - png_ptr->gamma_shift));
1246 for (i = 0; i < istop; i++)
1247 {
1248 png_free(png_ptr, png_ptr->gamma_16_from_1[i]);
1249 }
1250 png_free(png_ptr, png_ptr->gamma_16_from_1);
1251 }
1252 if (png_ptr->gamma_16_to_1 != NULL)
1253 {
1254 int i;
1255 int istop = (1 << (8 - png_ptr->gamma_shift));
1256 for (i = 0; i < istop; i++)
1257 {
1258 png_free(png_ptr, png_ptr->gamma_16_to_1[i]);
1259 }
1260 png_free(png_ptr, png_ptr->gamma_16_to_1);
1261 }
1262#endif
1263#endif
1264#if defined(PNG_TIME_RFC1123_SUPPORTED)
1265 png_free(png_ptr, png_ptr->time_buffer);
1266#endif
1267
1268 inflateEnd(&png_ptr->zstream);
1269#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1270 png_free(png_ptr, png_ptr->save_buffer);
1271#endif
1272
1273#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1274#ifdef PNG_TEXT_SUPPORTED
1275 png_free(png_ptr, png_ptr->current_text);
1276#endif /* PNG_TEXT_SUPPORTED */
1277#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1278
1279 /* Save the important info out of the png_struct, in case it is
1280 * being used again.
1281 */
1282#ifdef PNG_SETJMP_SUPPORTED
1283 png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
1284#endif
1285
1286 error_fn = png_ptr->error_fn;
1287 warning_fn = png_ptr->warning_fn;
1288 error_ptr = png_ptr->error_ptr;
1289#ifdef PNG_USER_MEM_SUPPORTED
1290 free_fn = png_ptr->free_fn;
1291#endif
1292
1293 png_memset(png_ptr, 0, png_sizeof(png_struct));
1294
1295 png_ptr->error_fn = error_fn;
1296 png_ptr->warning_fn = warning_fn;
1297 png_ptr->error_ptr = error_ptr;
1298#ifdef PNG_USER_MEM_SUPPORTED
1299 png_ptr->free_fn = free_fn;
1300#endif
1301
1302#ifdef PNG_SETJMP_SUPPORTED
1303 png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
1304#endif
1305
1306}
1307
1308void PNGAPI
1309png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
1310{
1311 if (png_ptr == NULL)
1312 return;
1313 png_ptr->read_row_fn = read_row_fn;
1314}
1315
1316
1317#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1318#if defined(PNG_INFO_IMAGE_SUPPORTED)
1319void PNGAPI
1320png_read_png(png_structp png_ptr, png_infop info_ptr,
1321 int transforms,
1322 voidp params)
1323{
1324 int row;
1325
1326 if (png_ptr == NULL)
1327 return;
1328#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
1329 /* Invert the alpha channel from opacity to transparency
1330 */
1331 if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
1332 png_set_invert_alpha(png_ptr);
1333#endif
1334
1335 /* png_read_info() gives us all of the information from the
1336 * PNG file before the first IDAT (image data chunk).
1337 */
1338 png_read_info(png_ptr, info_ptr);
1339 if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep))
1340 png_error(png_ptr, "Image is too high to process with png_read_png()");
1341
1342 /* -------------- image transformations start here ------------------- */
1343
1344#if defined(PNG_READ_16_TO_8_SUPPORTED)
1345 /* Tell libpng to strip 16 bit/color files down to 8 bits per color.
1346 */
1347 if (transforms & PNG_TRANSFORM_STRIP_16)
1348 png_set_strip_16(png_ptr);
1349#endif
1350
1351#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1352 /* Strip alpha bytes from the input data without combining with
1353 * the background (not recommended).
1354 */
1355 if (transforms & PNG_TRANSFORM_STRIP_ALPHA)
1356 png_set_strip_alpha(png_ptr);
1357#endif
1358
1359#if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED)
1360 /* Extract multiple pixels with bit depths of 1, 2, or 4 from a single
1361 * byte into separate bytes (useful for paletted and grayscale images).
1362 */
1363 if (transforms & PNG_TRANSFORM_PACKING)
1364 png_set_packing(png_ptr);
1365#endif
1366
1367#if defined(PNG_READ_PACKSWAP_SUPPORTED)
1368 /* Change the order of packed pixels to least significant bit first
1369 * (not useful if you are using png_set_packing).
1370 */
1371 if (transforms & PNG_TRANSFORM_PACKSWAP)
1372 png_set_packswap(png_ptr);
1373#endif
1374
1375#if defined(PNG_READ_EXPAND_SUPPORTED)
1376 /* Expand paletted colors into true RGB triplets
1377 * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel
1378 * Expand paletted or RGB images with transparency to full alpha
1379 * channels so the data will be available as RGBA quartets.
1380 */
1381 if (transforms & PNG_TRANSFORM_EXPAND)
1382 if ((png_ptr->bit_depth < 8) ||
1383 (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
1384 (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
1385 png_set_expand(png_ptr);
1386#endif
1387
1388 /* We don't handle background color or gamma transformation or dithering.
1389 */
1390
1391#if defined(PNG_READ_INVERT_SUPPORTED)
1392 /* Invert monochrome files to have 0 as white and 1 as black
1393 */
1394 if (transforms & PNG_TRANSFORM_INVERT_MONO)
1395 png_set_invert_mono(png_ptr);
1396#endif
1397
1398#if defined(PNG_READ_SHIFT_SUPPORTED)
1399 /* If you want to shift the pixel values from the range [0,255] or
1400 * [0,65535] to the original [0,7] or [0,31], or whatever range the
1401 * colors were originally in:
1402 */
1403 if ((transforms & PNG_TRANSFORM_SHIFT)
1404 && png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
1405 {
1406 png_color_8p sig_bit;
1407
1408 png_get_sBIT(png_ptr, info_ptr, &sig_bit);
1409 png_set_shift(png_ptr, sig_bit);
1410 }
1411#endif
1412
1413#if defined(PNG_READ_BGR_SUPPORTED)
1414 /* Flip the RGB pixels to BGR (or RGBA to BGRA)
1415 */
1416 if (transforms & PNG_TRANSFORM_BGR)
1417 png_set_bgr(png_ptr);
1418#endif
1419
1420#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
1421 /* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
1422 */
1423 if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
1424 png_set_swap_alpha(png_ptr);
1425#endif
1426
1427#if defined(PNG_READ_SWAP_SUPPORTED)
1428 /* Swap bytes of 16 bit files to least significant byte first
1429 */
1430 if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
1431 png_set_swap(png_ptr);
1432#endif
1433
1434 /* We don't handle adding filler bytes */
1435
1436 /* Optional call to gamma correct and add the background to the palette
1437 * and update info structure. REQUIRED if you are expecting libpng to
1438 * update the palette for you (i.e., you selected such a transform above).
1439 */
1440 png_read_update_info(png_ptr, info_ptr);
1441
1442 /* -------------- image transformations end here ------------------- */
1443
1444#ifdef PNG_FREE_ME_SUPPORTED
1445 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
1446#endif
1447 if (info_ptr->row_pointers == NULL)
1448 {
1449 info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
1450 info_ptr->height * png_sizeof(png_bytep));
1451 png_memset(info_ptr->row_pointers, 0, info_ptr->height
1452 * png_sizeof(png_bytep));
1453#ifdef PNG_FREE_ME_SUPPORTED
1454 info_ptr->free_me |= PNG_FREE_ROWS;
1455#endif
1456 for (row = 0; row < (int)info_ptr->height; row++)
1457 info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr,
1458 png_get_rowbytes(png_ptr, info_ptr));
1459 }
1460
1461 png_read_image(png_ptr, info_ptr->row_pointers);
1462 info_ptr->valid |= PNG_INFO_IDAT;
1463
1464 /* Read rest of file, and get additional chunks in info_ptr - REQUIRED */
1465 png_read_end(png_ptr, info_ptr);
1466
1467 transforms = transforms; /* Quiet compiler warnings */
1468 params = params;
1469
1470}
1471#endif /* PNG_INFO_IMAGE_SUPPORTED */
1472#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
1473#endif /* PNG_READ_SUPPORTED */
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