rev |
line source |
nuclear@26
|
1
|
nuclear@26
|
2 /* pngrutil.c - utilities to read a PNG file
|
nuclear@26
|
3 *
|
nuclear@26
|
4 * Last changed in libpng 1.2.33 [October 31, 2008]
|
nuclear@26
|
5 * For conditions of distribution and use, see copyright notice in png.h
|
nuclear@26
|
6 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
|
nuclear@26
|
7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
|
nuclear@26
|
8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
|
nuclear@26
|
9 *
|
nuclear@26
|
10 * This file contains routines that are only called from within
|
nuclear@26
|
11 * libpng itself during the course of reading an image.
|
nuclear@26
|
12 */
|
nuclear@26
|
13
|
nuclear@26
|
14 #define PNG_INTERNAL
|
nuclear@26
|
15 #include "png.h"
|
nuclear@26
|
16 #if defined(PNG_READ_SUPPORTED)
|
nuclear@26
|
17
|
nuclear@26
|
18 #if defined(_WIN32_WCE) && (_WIN32_WCE<0x500)
|
nuclear@26
|
19 # define WIN32_WCE_OLD
|
nuclear@26
|
20 #endif
|
nuclear@26
|
21
|
nuclear@26
|
22 #ifdef PNG_FLOATING_POINT_SUPPORTED
|
nuclear@26
|
23 # if defined(WIN32_WCE_OLD)
|
nuclear@26
|
24 /* strtod() function is not supported on WindowsCE */
|
nuclear@26
|
25 __inline double png_strtod(png_structp png_ptr, PNG_CONST char *nptr, char **endptr)
|
nuclear@26
|
26 {
|
nuclear@26
|
27 double result = 0;
|
nuclear@26
|
28 int len;
|
nuclear@26
|
29 wchar_t *str, *end;
|
nuclear@26
|
30
|
nuclear@26
|
31 len = MultiByteToWideChar(CP_ACP, 0, nptr, -1, NULL, 0);
|
nuclear@26
|
32 str = (wchar_t *)png_malloc(png_ptr, len * png_sizeof(wchar_t));
|
nuclear@26
|
33 if ( NULL != str )
|
nuclear@26
|
34 {
|
nuclear@26
|
35 MultiByteToWideChar(CP_ACP, 0, nptr, -1, str, len);
|
nuclear@26
|
36 result = wcstod(str, &end);
|
nuclear@26
|
37 len = WideCharToMultiByte(CP_ACP, 0, end, -1, NULL, 0, NULL, NULL);
|
nuclear@26
|
38 *endptr = (char *)nptr + (png_strlen(nptr) - len + 1);
|
nuclear@26
|
39 png_free(png_ptr, str);
|
nuclear@26
|
40 }
|
nuclear@26
|
41 return result;
|
nuclear@26
|
42 }
|
nuclear@26
|
43 # else
|
nuclear@26
|
44 # define png_strtod(p,a,b) strtod(a,b)
|
nuclear@26
|
45 # endif
|
nuclear@26
|
46 #endif
|
nuclear@26
|
47
|
nuclear@26
|
48 png_uint_32 PNGAPI
|
nuclear@26
|
49 png_get_uint_31(png_structp png_ptr, png_bytep buf)
|
nuclear@26
|
50 {
|
nuclear@26
|
51 #ifdef PNG_READ_BIG_ENDIAN_SUPPORTED
|
nuclear@26
|
52 png_uint_32 i = png_get_uint_32(buf);
|
nuclear@26
|
53 #else
|
nuclear@26
|
54 /* Avoid an extra function call by inlining the result. */
|
nuclear@26
|
55 png_uint_32 i = ((png_uint_32)(*buf) << 24) +
|
nuclear@26
|
56 ((png_uint_32)(*(buf + 1)) << 16) +
|
nuclear@26
|
57 ((png_uint_32)(*(buf + 2)) << 8) +
|
nuclear@26
|
58 (png_uint_32)(*(buf + 3));
|
nuclear@26
|
59 #endif
|
nuclear@26
|
60 if (i > PNG_UINT_31_MAX)
|
nuclear@26
|
61 png_error(png_ptr, "PNG unsigned integer out of range.");
|
nuclear@26
|
62 return (i);
|
nuclear@26
|
63 }
|
nuclear@26
|
64 #ifndef PNG_READ_BIG_ENDIAN_SUPPORTED
|
nuclear@26
|
65 /* Grab an unsigned 32-bit integer from a buffer in big-endian format. */
|
nuclear@26
|
66 png_uint_32 PNGAPI
|
nuclear@26
|
67 png_get_uint_32(png_bytep buf)
|
nuclear@26
|
68 {
|
nuclear@26
|
69 png_uint_32 i = ((png_uint_32)(*buf) << 24) +
|
nuclear@26
|
70 ((png_uint_32)(*(buf + 1)) << 16) +
|
nuclear@26
|
71 ((png_uint_32)(*(buf + 2)) << 8) +
|
nuclear@26
|
72 (png_uint_32)(*(buf + 3));
|
nuclear@26
|
73
|
nuclear@26
|
74 return (i);
|
nuclear@26
|
75 }
|
nuclear@26
|
76
|
nuclear@26
|
77 /* Grab a signed 32-bit integer from a buffer in big-endian format. The
|
nuclear@26
|
78 * data is stored in the PNG file in two's complement format, and it is
|
nuclear@26
|
79 * assumed that the machine format for signed integers is the same. */
|
nuclear@26
|
80 png_int_32 PNGAPI
|
nuclear@26
|
81 png_get_int_32(png_bytep buf)
|
nuclear@26
|
82 {
|
nuclear@26
|
83 png_int_32 i = ((png_int_32)(*buf) << 24) +
|
nuclear@26
|
84 ((png_int_32)(*(buf + 1)) << 16) +
|
nuclear@26
|
85 ((png_int_32)(*(buf + 2)) << 8) +
|
nuclear@26
|
86 (png_int_32)(*(buf + 3));
|
nuclear@26
|
87
|
nuclear@26
|
88 return (i);
|
nuclear@26
|
89 }
|
nuclear@26
|
90
|
nuclear@26
|
91 /* Grab an unsigned 16-bit integer from a buffer in big-endian format. */
|
nuclear@26
|
92 png_uint_16 PNGAPI
|
nuclear@26
|
93 png_get_uint_16(png_bytep buf)
|
nuclear@26
|
94 {
|
nuclear@26
|
95 png_uint_16 i = (png_uint_16)(((png_uint_16)(*buf) << 8) +
|
nuclear@26
|
96 (png_uint_16)(*(buf + 1)));
|
nuclear@26
|
97
|
nuclear@26
|
98 return (i);
|
nuclear@26
|
99 }
|
nuclear@26
|
100 #endif /* PNG_READ_BIG_ENDIAN_SUPPORTED */
|
nuclear@26
|
101
|
nuclear@26
|
102 /* Read the chunk header (length + type name).
|
nuclear@26
|
103 * Put the type name into png_ptr->chunk_name, and return the length.
|
nuclear@26
|
104 */
|
nuclear@26
|
105 png_uint_32 /* PRIVATE */
|
nuclear@26
|
106 png_read_chunk_header(png_structp png_ptr)
|
nuclear@26
|
107 {
|
nuclear@26
|
108 png_byte buf[8];
|
nuclear@26
|
109 png_uint_32 length;
|
nuclear@26
|
110
|
nuclear@26
|
111 /* read the length and the chunk name */
|
nuclear@26
|
112 png_read_data(png_ptr, buf, 8);
|
nuclear@26
|
113 length = png_get_uint_31(png_ptr, buf);
|
nuclear@26
|
114
|
nuclear@26
|
115 /* put the chunk name into png_ptr->chunk_name */
|
nuclear@26
|
116 png_memcpy(png_ptr->chunk_name, buf + 4, 4);
|
nuclear@26
|
117
|
nuclear@26
|
118 png_debug2(0, "Reading %s chunk, length = %lu\n",
|
nuclear@26
|
119 png_ptr->chunk_name, length);
|
nuclear@26
|
120
|
nuclear@26
|
121 /* reset the crc and run it over the chunk name */
|
nuclear@26
|
122 png_reset_crc(png_ptr);
|
nuclear@26
|
123 png_calculate_crc(png_ptr, png_ptr->chunk_name, 4);
|
nuclear@26
|
124
|
nuclear@26
|
125 /* check to see if chunk name is valid */
|
nuclear@26
|
126 png_check_chunk_name(png_ptr, png_ptr->chunk_name);
|
nuclear@26
|
127
|
nuclear@26
|
128 return length;
|
nuclear@26
|
129 }
|
nuclear@26
|
130
|
nuclear@26
|
131 /* Read data, and (optionally) run it through the CRC. */
|
nuclear@26
|
132 void /* PRIVATE */
|
nuclear@26
|
133 png_crc_read(png_structp png_ptr, png_bytep buf, png_size_t length)
|
nuclear@26
|
134 {
|
nuclear@26
|
135 if (png_ptr == NULL) return;
|
nuclear@26
|
136 png_read_data(png_ptr, buf, length);
|
nuclear@26
|
137 png_calculate_crc(png_ptr, buf, length);
|
nuclear@26
|
138 }
|
nuclear@26
|
139
|
nuclear@26
|
140 /* Optionally skip data and then check the CRC. Depending on whether we
|
nuclear@26
|
141 are reading a ancillary or critical chunk, and how the program has set
|
nuclear@26
|
142 things up, we may calculate the CRC on the data and print a message.
|
nuclear@26
|
143 Returns '1' if there was a CRC error, '0' otherwise. */
|
nuclear@26
|
144 int /* PRIVATE */
|
nuclear@26
|
145 png_crc_finish(png_structp png_ptr, png_uint_32 skip)
|
nuclear@26
|
146 {
|
nuclear@26
|
147 png_size_t i;
|
nuclear@26
|
148 png_size_t istop = png_ptr->zbuf_size;
|
nuclear@26
|
149
|
nuclear@26
|
150 for (i = (png_size_t)skip; i > istop; i -= istop)
|
nuclear@26
|
151 {
|
nuclear@26
|
152 png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
|
nuclear@26
|
153 }
|
nuclear@26
|
154 if (i)
|
nuclear@26
|
155 {
|
nuclear@26
|
156 png_crc_read(png_ptr, png_ptr->zbuf, i);
|
nuclear@26
|
157 }
|
nuclear@26
|
158
|
nuclear@26
|
159 if (png_crc_error(png_ptr))
|
nuclear@26
|
160 {
|
nuclear@26
|
161 if (((png_ptr->chunk_name[0] & 0x20) && /* Ancillary */
|
nuclear@26
|
162 !(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) ||
|
nuclear@26
|
163 (!(png_ptr->chunk_name[0] & 0x20) && /* Critical */
|
nuclear@26
|
164 (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE)))
|
nuclear@26
|
165 {
|
nuclear@26
|
166 png_chunk_warning(png_ptr, "CRC error");
|
nuclear@26
|
167 }
|
nuclear@26
|
168 else
|
nuclear@26
|
169 {
|
nuclear@26
|
170 png_chunk_error(png_ptr, "CRC error");
|
nuclear@26
|
171 }
|
nuclear@26
|
172 return (1);
|
nuclear@26
|
173 }
|
nuclear@26
|
174
|
nuclear@26
|
175 return (0);
|
nuclear@26
|
176 }
|
nuclear@26
|
177
|
nuclear@26
|
178 /* Compare the CRC stored in the PNG file with that calculated by libpng from
|
nuclear@26
|
179 the data it has read thus far. */
|
nuclear@26
|
180 int /* PRIVATE */
|
nuclear@26
|
181 png_crc_error(png_structp png_ptr)
|
nuclear@26
|
182 {
|
nuclear@26
|
183 png_byte crc_bytes[4];
|
nuclear@26
|
184 png_uint_32 crc;
|
nuclear@26
|
185 int need_crc = 1;
|
nuclear@26
|
186
|
nuclear@26
|
187 if (png_ptr->chunk_name[0] & 0x20) /* ancillary */
|
nuclear@26
|
188 {
|
nuclear@26
|
189 if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) ==
|
nuclear@26
|
190 (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN))
|
nuclear@26
|
191 need_crc = 0;
|
nuclear@26
|
192 }
|
nuclear@26
|
193 else /* critical */
|
nuclear@26
|
194 {
|
nuclear@26
|
195 if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE)
|
nuclear@26
|
196 need_crc = 0;
|
nuclear@26
|
197 }
|
nuclear@26
|
198
|
nuclear@26
|
199 png_read_data(png_ptr, crc_bytes, 4);
|
nuclear@26
|
200
|
nuclear@26
|
201 if (need_crc)
|
nuclear@26
|
202 {
|
nuclear@26
|
203 crc = png_get_uint_32(crc_bytes);
|
nuclear@26
|
204 return ((int)(crc != png_ptr->crc));
|
nuclear@26
|
205 }
|
nuclear@26
|
206 else
|
nuclear@26
|
207 return (0);
|
nuclear@26
|
208 }
|
nuclear@26
|
209
|
nuclear@26
|
210 #if defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_READ_iTXt_SUPPORTED) || \
|
nuclear@26
|
211 defined(PNG_READ_iCCP_SUPPORTED)
|
nuclear@26
|
212 /*
|
nuclear@26
|
213 * Decompress trailing data in a chunk. The assumption is that chunkdata
|
nuclear@26
|
214 * points at an allocated area holding the contents of a chunk with a
|
nuclear@26
|
215 * trailing compressed part. What we get back is an allocated area
|
nuclear@26
|
216 * holding the original prefix part and an uncompressed version of the
|
nuclear@26
|
217 * trailing part (the malloc area passed in is freed).
|
nuclear@26
|
218 */
|
nuclear@26
|
219 void /* PRIVATE */
|
nuclear@26
|
220 png_decompress_chunk(png_structp png_ptr, int comp_type,
|
nuclear@26
|
221 png_size_t chunklength,
|
nuclear@26
|
222 png_size_t prefix_size, png_size_t *newlength)
|
nuclear@26
|
223 {
|
nuclear@26
|
224 static PNG_CONST char msg[] = "Error decoding compressed text";
|
nuclear@26
|
225 png_charp text;
|
nuclear@26
|
226 png_size_t text_size;
|
nuclear@26
|
227
|
nuclear@26
|
228 if (comp_type == PNG_COMPRESSION_TYPE_BASE)
|
nuclear@26
|
229 {
|
nuclear@26
|
230 int ret = Z_OK;
|
nuclear@26
|
231 png_ptr->zstream.next_in = (png_bytep)(png_ptr->chunkdata + prefix_size);
|
nuclear@26
|
232 png_ptr->zstream.avail_in = (uInt)(chunklength - prefix_size);
|
nuclear@26
|
233 png_ptr->zstream.next_out = png_ptr->zbuf;
|
nuclear@26
|
234 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
|
nuclear@26
|
235
|
nuclear@26
|
236 text_size = 0;
|
nuclear@26
|
237 text = NULL;
|
nuclear@26
|
238
|
nuclear@26
|
239 while (png_ptr->zstream.avail_in)
|
nuclear@26
|
240 {
|
nuclear@26
|
241 ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
|
nuclear@26
|
242 if (ret != Z_OK && ret != Z_STREAM_END)
|
nuclear@26
|
243 {
|
nuclear@26
|
244 if (png_ptr->zstream.msg != NULL)
|
nuclear@26
|
245 png_warning(png_ptr, png_ptr->zstream.msg);
|
nuclear@26
|
246 else
|
nuclear@26
|
247 png_warning(png_ptr, msg);
|
nuclear@26
|
248 inflateReset(&png_ptr->zstream);
|
nuclear@26
|
249 png_ptr->zstream.avail_in = 0;
|
nuclear@26
|
250
|
nuclear@26
|
251 if (text == NULL)
|
nuclear@26
|
252 {
|
nuclear@26
|
253 text_size = prefix_size + png_sizeof(msg) + 1;
|
nuclear@26
|
254 text = (png_charp)png_malloc_warn(png_ptr, text_size);
|
nuclear@26
|
255 if (text == NULL)
|
nuclear@26
|
256 {
|
nuclear@26
|
257 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
258 png_ptr->chunkdata = NULL;
|
nuclear@26
|
259 png_error(png_ptr, "Not enough memory to decompress chunk");
|
nuclear@26
|
260 }
|
nuclear@26
|
261 png_memcpy(text, png_ptr->chunkdata, prefix_size);
|
nuclear@26
|
262 }
|
nuclear@26
|
263
|
nuclear@26
|
264 text[text_size - 1] = 0x00;
|
nuclear@26
|
265
|
nuclear@26
|
266 /* Copy what we can of the error message into the text chunk */
|
nuclear@26
|
267 text_size = (png_size_t)(chunklength -
|
nuclear@26
|
268 (text - png_ptr->chunkdata) - 1);
|
nuclear@26
|
269 if (text_size > png_sizeof(msg))
|
nuclear@26
|
270 text_size = png_sizeof(msg);
|
nuclear@26
|
271 png_memcpy(text + prefix_size, msg, text_size);
|
nuclear@26
|
272 break;
|
nuclear@26
|
273 }
|
nuclear@26
|
274 if (!png_ptr->zstream.avail_out || ret == Z_STREAM_END)
|
nuclear@26
|
275 {
|
nuclear@26
|
276 if (text == NULL)
|
nuclear@26
|
277 {
|
nuclear@26
|
278 text_size = prefix_size +
|
nuclear@26
|
279 png_ptr->zbuf_size - png_ptr->zstream.avail_out;
|
nuclear@26
|
280 text = (png_charp)png_malloc_warn(png_ptr, text_size + 1);
|
nuclear@26
|
281 if (text == NULL)
|
nuclear@26
|
282 {
|
nuclear@26
|
283 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
284 png_ptr->chunkdata = NULL;
|
nuclear@26
|
285 png_error(png_ptr,
|
nuclear@26
|
286 "Not enough memory to decompress chunk.");
|
nuclear@26
|
287 }
|
nuclear@26
|
288 png_memcpy(text + prefix_size, png_ptr->zbuf,
|
nuclear@26
|
289 text_size - prefix_size);
|
nuclear@26
|
290 png_memcpy(text, png_ptr->chunkdata, prefix_size);
|
nuclear@26
|
291 *(text + text_size) = 0x00;
|
nuclear@26
|
292 }
|
nuclear@26
|
293 else
|
nuclear@26
|
294 {
|
nuclear@26
|
295 png_charp tmp;
|
nuclear@26
|
296
|
nuclear@26
|
297 tmp = text;
|
nuclear@26
|
298 text = (png_charp)png_malloc_warn(png_ptr,
|
nuclear@26
|
299 (png_uint_32)(text_size +
|
nuclear@26
|
300 png_ptr->zbuf_size - png_ptr->zstream.avail_out + 1));
|
nuclear@26
|
301 if (text == NULL)
|
nuclear@26
|
302 {
|
nuclear@26
|
303 png_free(png_ptr, tmp);
|
nuclear@26
|
304 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
305 png_ptr->chunkdata = NULL;
|
nuclear@26
|
306 png_error(png_ptr,
|
nuclear@26
|
307 "Not enough memory to decompress chunk..");
|
nuclear@26
|
308 }
|
nuclear@26
|
309 png_memcpy(text, tmp, text_size);
|
nuclear@26
|
310 png_free(png_ptr, tmp);
|
nuclear@26
|
311 png_memcpy(text + text_size, png_ptr->zbuf,
|
nuclear@26
|
312 (png_ptr->zbuf_size - png_ptr->zstream.avail_out));
|
nuclear@26
|
313 text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out;
|
nuclear@26
|
314 *(text + text_size) = 0x00;
|
nuclear@26
|
315 }
|
nuclear@26
|
316 if (ret == Z_STREAM_END)
|
nuclear@26
|
317 break;
|
nuclear@26
|
318 else
|
nuclear@26
|
319 {
|
nuclear@26
|
320 png_ptr->zstream.next_out = png_ptr->zbuf;
|
nuclear@26
|
321 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
|
nuclear@26
|
322 }
|
nuclear@26
|
323 }
|
nuclear@26
|
324 }
|
nuclear@26
|
325 if (ret != Z_STREAM_END)
|
nuclear@26
|
326 {
|
nuclear@26
|
327 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
|
nuclear@26
|
328 char umsg[52];
|
nuclear@26
|
329
|
nuclear@26
|
330 if (ret == Z_BUF_ERROR)
|
nuclear@26
|
331 png_snprintf(umsg, 52,
|
nuclear@26
|
332 "Buffer error in compressed datastream in %s chunk",
|
nuclear@26
|
333 png_ptr->chunk_name);
|
nuclear@26
|
334 else if (ret == Z_DATA_ERROR)
|
nuclear@26
|
335 png_snprintf(umsg, 52,
|
nuclear@26
|
336 "Data error in compressed datastream in %s chunk",
|
nuclear@26
|
337 png_ptr->chunk_name);
|
nuclear@26
|
338 else
|
nuclear@26
|
339 png_snprintf(umsg, 52,
|
nuclear@26
|
340 "Incomplete compressed datastream in %s chunk",
|
nuclear@26
|
341 png_ptr->chunk_name);
|
nuclear@26
|
342 png_warning(png_ptr, umsg);
|
nuclear@26
|
343 #else
|
nuclear@26
|
344 png_warning(png_ptr,
|
nuclear@26
|
345 "Incomplete compressed datastream in chunk other than IDAT");
|
nuclear@26
|
346 #endif
|
nuclear@26
|
347 text_size = prefix_size;
|
nuclear@26
|
348 if (text == NULL)
|
nuclear@26
|
349 {
|
nuclear@26
|
350 text = (png_charp)png_malloc_warn(png_ptr, text_size+1);
|
nuclear@26
|
351 if (text == NULL)
|
nuclear@26
|
352 {
|
nuclear@26
|
353 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
354 png_ptr->chunkdata = NULL;
|
nuclear@26
|
355 png_error(png_ptr, "Not enough memory for text.");
|
nuclear@26
|
356 }
|
nuclear@26
|
357 png_memcpy(text, png_ptr->chunkdata, prefix_size);
|
nuclear@26
|
358 }
|
nuclear@26
|
359 *(text + text_size) = 0x00;
|
nuclear@26
|
360 }
|
nuclear@26
|
361
|
nuclear@26
|
362 inflateReset(&png_ptr->zstream);
|
nuclear@26
|
363 png_ptr->zstream.avail_in = 0;
|
nuclear@26
|
364
|
nuclear@26
|
365 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
366 png_ptr->chunkdata = text;
|
nuclear@26
|
367 *newlength=text_size;
|
nuclear@26
|
368 }
|
nuclear@26
|
369 else /* if (comp_type != PNG_COMPRESSION_TYPE_BASE) */
|
nuclear@26
|
370 {
|
nuclear@26
|
371 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
|
nuclear@26
|
372 char umsg[50];
|
nuclear@26
|
373
|
nuclear@26
|
374 png_snprintf(umsg, 50, "Unknown zTXt compression type %d", comp_type);
|
nuclear@26
|
375 png_warning(png_ptr, umsg);
|
nuclear@26
|
376 #else
|
nuclear@26
|
377 png_warning(png_ptr, "Unknown zTXt compression type");
|
nuclear@26
|
378 #endif
|
nuclear@26
|
379
|
nuclear@26
|
380 *(png_ptr->chunkdata + prefix_size) = 0x00;
|
nuclear@26
|
381 *newlength = prefix_size;
|
nuclear@26
|
382 }
|
nuclear@26
|
383 }
|
nuclear@26
|
384 #endif
|
nuclear@26
|
385
|
nuclear@26
|
386 /* read and check the IDHR chunk */
|
nuclear@26
|
387 void /* PRIVATE */
|
nuclear@26
|
388 png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
389 {
|
nuclear@26
|
390 png_byte buf[13];
|
nuclear@26
|
391 png_uint_32 width, height;
|
nuclear@26
|
392 int bit_depth, color_type, compression_type, filter_type;
|
nuclear@26
|
393 int interlace_type;
|
nuclear@26
|
394
|
nuclear@26
|
395 png_debug(1, "in png_handle_IHDR\n");
|
nuclear@26
|
396
|
nuclear@26
|
397 if (png_ptr->mode & PNG_HAVE_IHDR)
|
nuclear@26
|
398 png_error(png_ptr, "Out of place IHDR");
|
nuclear@26
|
399
|
nuclear@26
|
400 /* check the length */
|
nuclear@26
|
401 if (length != 13)
|
nuclear@26
|
402 png_error(png_ptr, "Invalid IHDR chunk");
|
nuclear@26
|
403
|
nuclear@26
|
404 png_ptr->mode |= PNG_HAVE_IHDR;
|
nuclear@26
|
405
|
nuclear@26
|
406 png_crc_read(png_ptr, buf, 13);
|
nuclear@26
|
407 png_crc_finish(png_ptr, 0);
|
nuclear@26
|
408
|
nuclear@26
|
409 width = png_get_uint_31(png_ptr, buf);
|
nuclear@26
|
410 height = png_get_uint_31(png_ptr, buf + 4);
|
nuclear@26
|
411 bit_depth = buf[8];
|
nuclear@26
|
412 color_type = buf[9];
|
nuclear@26
|
413 compression_type = buf[10];
|
nuclear@26
|
414 filter_type = buf[11];
|
nuclear@26
|
415 interlace_type = buf[12];
|
nuclear@26
|
416
|
nuclear@26
|
417 /* set internal variables */
|
nuclear@26
|
418 png_ptr->width = width;
|
nuclear@26
|
419 png_ptr->height = height;
|
nuclear@26
|
420 png_ptr->bit_depth = (png_byte)bit_depth;
|
nuclear@26
|
421 png_ptr->interlaced = (png_byte)interlace_type;
|
nuclear@26
|
422 png_ptr->color_type = (png_byte)color_type;
|
nuclear@26
|
423 #if defined(PNG_MNG_FEATURES_SUPPORTED)
|
nuclear@26
|
424 png_ptr->filter_type = (png_byte)filter_type;
|
nuclear@26
|
425 #endif
|
nuclear@26
|
426 png_ptr->compression_type = (png_byte)compression_type;
|
nuclear@26
|
427
|
nuclear@26
|
428 /* find number of channels */
|
nuclear@26
|
429 switch (png_ptr->color_type)
|
nuclear@26
|
430 {
|
nuclear@26
|
431 case PNG_COLOR_TYPE_GRAY:
|
nuclear@26
|
432 case PNG_COLOR_TYPE_PALETTE:
|
nuclear@26
|
433 png_ptr->channels = 1;
|
nuclear@26
|
434 break;
|
nuclear@26
|
435 case PNG_COLOR_TYPE_RGB:
|
nuclear@26
|
436 png_ptr->channels = 3;
|
nuclear@26
|
437 break;
|
nuclear@26
|
438 case PNG_COLOR_TYPE_GRAY_ALPHA:
|
nuclear@26
|
439 png_ptr->channels = 2;
|
nuclear@26
|
440 break;
|
nuclear@26
|
441 case PNG_COLOR_TYPE_RGB_ALPHA:
|
nuclear@26
|
442 png_ptr->channels = 4;
|
nuclear@26
|
443 break;
|
nuclear@26
|
444 }
|
nuclear@26
|
445
|
nuclear@26
|
446 /* set up other useful info */
|
nuclear@26
|
447 png_ptr->pixel_depth = (png_byte)(png_ptr->bit_depth *
|
nuclear@26
|
448 png_ptr->channels);
|
nuclear@26
|
449 png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->width);
|
nuclear@26
|
450 png_debug1(3, "bit_depth = %d\n", png_ptr->bit_depth);
|
nuclear@26
|
451 png_debug1(3, "channels = %d\n", png_ptr->channels);
|
nuclear@26
|
452 png_debug1(3, "rowbytes = %lu\n", png_ptr->rowbytes);
|
nuclear@26
|
453 png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth,
|
nuclear@26
|
454 color_type, interlace_type, compression_type, filter_type);
|
nuclear@26
|
455 }
|
nuclear@26
|
456
|
nuclear@26
|
457 /* read and check the palette */
|
nuclear@26
|
458 void /* PRIVATE */
|
nuclear@26
|
459 png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
460 {
|
nuclear@26
|
461 png_color palette[PNG_MAX_PALETTE_LENGTH];
|
nuclear@26
|
462 int num, i;
|
nuclear@26
|
463 #ifndef PNG_NO_POINTER_INDEXING
|
nuclear@26
|
464 png_colorp pal_ptr;
|
nuclear@26
|
465 #endif
|
nuclear@26
|
466
|
nuclear@26
|
467 png_debug(1, "in png_handle_PLTE\n");
|
nuclear@26
|
468
|
nuclear@26
|
469 if (!(png_ptr->mode & PNG_HAVE_IHDR))
|
nuclear@26
|
470 png_error(png_ptr, "Missing IHDR before PLTE");
|
nuclear@26
|
471 else if (png_ptr->mode & PNG_HAVE_IDAT)
|
nuclear@26
|
472 {
|
nuclear@26
|
473 png_warning(png_ptr, "Invalid PLTE after IDAT");
|
nuclear@26
|
474 png_crc_finish(png_ptr, length);
|
nuclear@26
|
475 return;
|
nuclear@26
|
476 }
|
nuclear@26
|
477 else if (png_ptr->mode & PNG_HAVE_PLTE)
|
nuclear@26
|
478 png_error(png_ptr, "Duplicate PLTE chunk");
|
nuclear@26
|
479
|
nuclear@26
|
480 png_ptr->mode |= PNG_HAVE_PLTE;
|
nuclear@26
|
481
|
nuclear@26
|
482 if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR))
|
nuclear@26
|
483 {
|
nuclear@26
|
484 png_warning(png_ptr,
|
nuclear@26
|
485 "Ignoring PLTE chunk in grayscale PNG");
|
nuclear@26
|
486 png_crc_finish(png_ptr, length);
|
nuclear@26
|
487 return;
|
nuclear@26
|
488 }
|
nuclear@26
|
489 #if !defined(PNG_READ_OPT_PLTE_SUPPORTED)
|
nuclear@26
|
490 if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
|
nuclear@26
|
491 {
|
nuclear@26
|
492 png_crc_finish(png_ptr, length);
|
nuclear@26
|
493 return;
|
nuclear@26
|
494 }
|
nuclear@26
|
495 #endif
|
nuclear@26
|
496
|
nuclear@26
|
497 if (length > 3*PNG_MAX_PALETTE_LENGTH || length % 3)
|
nuclear@26
|
498 {
|
nuclear@26
|
499 if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
|
nuclear@26
|
500 {
|
nuclear@26
|
501 png_warning(png_ptr, "Invalid palette chunk");
|
nuclear@26
|
502 png_crc_finish(png_ptr, length);
|
nuclear@26
|
503 return;
|
nuclear@26
|
504 }
|
nuclear@26
|
505 else
|
nuclear@26
|
506 {
|
nuclear@26
|
507 png_error(png_ptr, "Invalid palette chunk");
|
nuclear@26
|
508 }
|
nuclear@26
|
509 }
|
nuclear@26
|
510
|
nuclear@26
|
511 num = (int)length / 3;
|
nuclear@26
|
512
|
nuclear@26
|
513 #ifndef PNG_NO_POINTER_INDEXING
|
nuclear@26
|
514 for (i = 0, pal_ptr = palette; i < num; i++, pal_ptr++)
|
nuclear@26
|
515 {
|
nuclear@26
|
516 png_byte buf[3];
|
nuclear@26
|
517
|
nuclear@26
|
518 png_crc_read(png_ptr, buf, 3);
|
nuclear@26
|
519 pal_ptr->red = buf[0];
|
nuclear@26
|
520 pal_ptr->green = buf[1];
|
nuclear@26
|
521 pal_ptr->blue = buf[2];
|
nuclear@26
|
522 }
|
nuclear@26
|
523 #else
|
nuclear@26
|
524 for (i = 0; i < num; i++)
|
nuclear@26
|
525 {
|
nuclear@26
|
526 png_byte buf[3];
|
nuclear@26
|
527
|
nuclear@26
|
528 png_crc_read(png_ptr, buf, 3);
|
nuclear@26
|
529 /* don't depend upon png_color being any order */
|
nuclear@26
|
530 palette[i].red = buf[0];
|
nuclear@26
|
531 palette[i].green = buf[1];
|
nuclear@26
|
532 palette[i].blue = buf[2];
|
nuclear@26
|
533 }
|
nuclear@26
|
534 #endif
|
nuclear@26
|
535
|
nuclear@26
|
536 /* If we actually NEED the PLTE chunk (ie for a paletted image), we do
|
nuclear@26
|
537 whatever the normal CRC configuration tells us. However, if we
|
nuclear@26
|
538 have an RGB image, the PLTE can be considered ancillary, so
|
nuclear@26
|
539 we will act as though it is. */
|
nuclear@26
|
540 #if !defined(PNG_READ_OPT_PLTE_SUPPORTED)
|
nuclear@26
|
541 if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
|
nuclear@26
|
542 #endif
|
nuclear@26
|
543 {
|
nuclear@26
|
544 png_crc_finish(png_ptr, 0);
|
nuclear@26
|
545 }
|
nuclear@26
|
546 #if !defined(PNG_READ_OPT_PLTE_SUPPORTED)
|
nuclear@26
|
547 else if (png_crc_error(png_ptr)) /* Only if we have a CRC error */
|
nuclear@26
|
548 {
|
nuclear@26
|
549 /* If we don't want to use the data from an ancillary chunk,
|
nuclear@26
|
550 we have two options: an error abort, or a warning and we
|
nuclear@26
|
551 ignore the data in this chunk (which should be OK, since
|
nuclear@26
|
552 it's considered ancillary for a RGB or RGBA image). */
|
nuclear@26
|
553 if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_USE))
|
nuclear@26
|
554 {
|
nuclear@26
|
555 if (png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)
|
nuclear@26
|
556 {
|
nuclear@26
|
557 png_chunk_error(png_ptr, "CRC error");
|
nuclear@26
|
558 }
|
nuclear@26
|
559 else
|
nuclear@26
|
560 {
|
nuclear@26
|
561 png_chunk_warning(png_ptr, "CRC error");
|
nuclear@26
|
562 return;
|
nuclear@26
|
563 }
|
nuclear@26
|
564 }
|
nuclear@26
|
565 /* Otherwise, we (optionally) emit a warning and use the chunk. */
|
nuclear@26
|
566 else if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN))
|
nuclear@26
|
567 {
|
nuclear@26
|
568 png_chunk_warning(png_ptr, "CRC error");
|
nuclear@26
|
569 }
|
nuclear@26
|
570 }
|
nuclear@26
|
571 #endif
|
nuclear@26
|
572
|
nuclear@26
|
573 png_set_PLTE(png_ptr, info_ptr, palette, num);
|
nuclear@26
|
574
|
nuclear@26
|
575 #if defined(PNG_READ_tRNS_SUPPORTED)
|
nuclear@26
|
576 if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
|
nuclear@26
|
577 {
|
nuclear@26
|
578 if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
|
nuclear@26
|
579 {
|
nuclear@26
|
580 if (png_ptr->num_trans > (png_uint_16)num)
|
nuclear@26
|
581 {
|
nuclear@26
|
582 png_warning(png_ptr, "Truncating incorrect tRNS chunk length");
|
nuclear@26
|
583 png_ptr->num_trans = (png_uint_16)num;
|
nuclear@26
|
584 }
|
nuclear@26
|
585 if (info_ptr->num_trans > (png_uint_16)num)
|
nuclear@26
|
586 {
|
nuclear@26
|
587 png_warning(png_ptr, "Truncating incorrect info tRNS chunk length");
|
nuclear@26
|
588 info_ptr->num_trans = (png_uint_16)num;
|
nuclear@26
|
589 }
|
nuclear@26
|
590 }
|
nuclear@26
|
591 }
|
nuclear@26
|
592 #endif
|
nuclear@26
|
593
|
nuclear@26
|
594 }
|
nuclear@26
|
595
|
nuclear@26
|
596 void /* PRIVATE */
|
nuclear@26
|
597 png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
598 {
|
nuclear@26
|
599 png_debug(1, "in png_handle_IEND\n");
|
nuclear@26
|
600
|
nuclear@26
|
601 if (!(png_ptr->mode & PNG_HAVE_IHDR) || !(png_ptr->mode & PNG_HAVE_IDAT))
|
nuclear@26
|
602 {
|
nuclear@26
|
603 png_error(png_ptr, "No image in file");
|
nuclear@26
|
604 }
|
nuclear@26
|
605
|
nuclear@26
|
606 png_ptr->mode |= (PNG_AFTER_IDAT | PNG_HAVE_IEND);
|
nuclear@26
|
607
|
nuclear@26
|
608 if (length != 0)
|
nuclear@26
|
609 {
|
nuclear@26
|
610 png_warning(png_ptr, "Incorrect IEND chunk length");
|
nuclear@26
|
611 }
|
nuclear@26
|
612 png_crc_finish(png_ptr, length);
|
nuclear@26
|
613
|
nuclear@26
|
614 info_ptr = info_ptr; /* quiet compiler warnings about unused info_ptr */
|
nuclear@26
|
615 }
|
nuclear@26
|
616
|
nuclear@26
|
617 #if defined(PNG_READ_gAMA_SUPPORTED)
|
nuclear@26
|
618 void /* PRIVATE */
|
nuclear@26
|
619 png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
620 {
|
nuclear@26
|
621 png_fixed_point igamma;
|
nuclear@26
|
622 #ifdef PNG_FLOATING_POINT_SUPPORTED
|
nuclear@26
|
623 float file_gamma;
|
nuclear@26
|
624 #endif
|
nuclear@26
|
625 png_byte buf[4];
|
nuclear@26
|
626
|
nuclear@26
|
627 png_debug(1, "in png_handle_gAMA\n");
|
nuclear@26
|
628
|
nuclear@26
|
629 if (!(png_ptr->mode & PNG_HAVE_IHDR))
|
nuclear@26
|
630 png_error(png_ptr, "Missing IHDR before gAMA");
|
nuclear@26
|
631 else if (png_ptr->mode & PNG_HAVE_IDAT)
|
nuclear@26
|
632 {
|
nuclear@26
|
633 png_warning(png_ptr, "Invalid gAMA after IDAT");
|
nuclear@26
|
634 png_crc_finish(png_ptr, length);
|
nuclear@26
|
635 return;
|
nuclear@26
|
636 }
|
nuclear@26
|
637 else if (png_ptr->mode & PNG_HAVE_PLTE)
|
nuclear@26
|
638 /* Should be an error, but we can cope with it */
|
nuclear@26
|
639 png_warning(png_ptr, "Out of place gAMA chunk");
|
nuclear@26
|
640
|
nuclear@26
|
641 if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
|
nuclear@26
|
642 #if defined(PNG_READ_sRGB_SUPPORTED)
|
nuclear@26
|
643 && !(info_ptr->valid & PNG_INFO_sRGB)
|
nuclear@26
|
644 #endif
|
nuclear@26
|
645 )
|
nuclear@26
|
646 {
|
nuclear@26
|
647 png_warning(png_ptr, "Duplicate gAMA chunk");
|
nuclear@26
|
648 png_crc_finish(png_ptr, length);
|
nuclear@26
|
649 return;
|
nuclear@26
|
650 }
|
nuclear@26
|
651
|
nuclear@26
|
652 if (length != 4)
|
nuclear@26
|
653 {
|
nuclear@26
|
654 png_warning(png_ptr, "Incorrect gAMA chunk length");
|
nuclear@26
|
655 png_crc_finish(png_ptr, length);
|
nuclear@26
|
656 return;
|
nuclear@26
|
657 }
|
nuclear@26
|
658
|
nuclear@26
|
659 png_crc_read(png_ptr, buf, 4);
|
nuclear@26
|
660 if (png_crc_finish(png_ptr, 0))
|
nuclear@26
|
661 return;
|
nuclear@26
|
662
|
nuclear@26
|
663 igamma = (png_fixed_point)png_get_uint_32(buf);
|
nuclear@26
|
664 /* check for zero gamma */
|
nuclear@26
|
665 if (igamma == 0)
|
nuclear@26
|
666 {
|
nuclear@26
|
667 png_warning(png_ptr,
|
nuclear@26
|
668 "Ignoring gAMA chunk with gamma=0");
|
nuclear@26
|
669 return;
|
nuclear@26
|
670 }
|
nuclear@26
|
671
|
nuclear@26
|
672 #if defined(PNG_READ_sRGB_SUPPORTED)
|
nuclear@26
|
673 if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB))
|
nuclear@26
|
674 if (PNG_OUT_OF_RANGE(igamma, 45500L, 500))
|
nuclear@26
|
675 {
|
nuclear@26
|
676 png_warning(png_ptr,
|
nuclear@26
|
677 "Ignoring incorrect gAMA value when sRGB is also present");
|
nuclear@26
|
678 #ifndef PNG_NO_CONSOLE_IO
|
nuclear@26
|
679 fprintf(stderr, "gamma = (%d/100000)\n", (int)igamma);
|
nuclear@26
|
680 #endif
|
nuclear@26
|
681 return;
|
nuclear@26
|
682 }
|
nuclear@26
|
683 #endif /* PNG_READ_sRGB_SUPPORTED */
|
nuclear@26
|
684
|
nuclear@26
|
685 #ifdef PNG_FLOATING_POINT_SUPPORTED
|
nuclear@26
|
686 file_gamma = (float)igamma / (float)100000.0;
|
nuclear@26
|
687 # ifdef PNG_READ_GAMMA_SUPPORTED
|
nuclear@26
|
688 png_ptr->gamma = file_gamma;
|
nuclear@26
|
689 # endif
|
nuclear@26
|
690 png_set_gAMA(png_ptr, info_ptr, file_gamma);
|
nuclear@26
|
691 #endif
|
nuclear@26
|
692 #ifdef PNG_FIXED_POINT_SUPPORTED
|
nuclear@26
|
693 png_set_gAMA_fixed(png_ptr, info_ptr, igamma);
|
nuclear@26
|
694 #endif
|
nuclear@26
|
695 }
|
nuclear@26
|
696 #endif
|
nuclear@26
|
697
|
nuclear@26
|
698 #if defined(PNG_READ_sBIT_SUPPORTED)
|
nuclear@26
|
699 void /* PRIVATE */
|
nuclear@26
|
700 png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
701 {
|
nuclear@26
|
702 png_size_t truelen;
|
nuclear@26
|
703 png_byte buf[4];
|
nuclear@26
|
704
|
nuclear@26
|
705 png_debug(1, "in png_handle_sBIT\n");
|
nuclear@26
|
706
|
nuclear@26
|
707 buf[0] = buf[1] = buf[2] = buf[3] = 0;
|
nuclear@26
|
708
|
nuclear@26
|
709 if (!(png_ptr->mode & PNG_HAVE_IHDR))
|
nuclear@26
|
710 png_error(png_ptr, "Missing IHDR before sBIT");
|
nuclear@26
|
711 else if (png_ptr->mode & PNG_HAVE_IDAT)
|
nuclear@26
|
712 {
|
nuclear@26
|
713 png_warning(png_ptr, "Invalid sBIT after IDAT");
|
nuclear@26
|
714 png_crc_finish(png_ptr, length);
|
nuclear@26
|
715 return;
|
nuclear@26
|
716 }
|
nuclear@26
|
717 else if (png_ptr->mode & PNG_HAVE_PLTE)
|
nuclear@26
|
718 {
|
nuclear@26
|
719 /* Should be an error, but we can cope with it */
|
nuclear@26
|
720 png_warning(png_ptr, "Out of place sBIT chunk");
|
nuclear@26
|
721 }
|
nuclear@26
|
722 if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT))
|
nuclear@26
|
723 {
|
nuclear@26
|
724 png_warning(png_ptr, "Duplicate sBIT chunk");
|
nuclear@26
|
725 png_crc_finish(png_ptr, length);
|
nuclear@26
|
726 return;
|
nuclear@26
|
727 }
|
nuclear@26
|
728
|
nuclear@26
|
729 if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
|
nuclear@26
|
730 truelen = 3;
|
nuclear@26
|
731 else
|
nuclear@26
|
732 truelen = (png_size_t)png_ptr->channels;
|
nuclear@26
|
733
|
nuclear@26
|
734 if (length != truelen || length > 4)
|
nuclear@26
|
735 {
|
nuclear@26
|
736 png_warning(png_ptr, "Incorrect sBIT chunk length");
|
nuclear@26
|
737 png_crc_finish(png_ptr, length);
|
nuclear@26
|
738 return;
|
nuclear@26
|
739 }
|
nuclear@26
|
740
|
nuclear@26
|
741 png_crc_read(png_ptr, buf, truelen);
|
nuclear@26
|
742 if (png_crc_finish(png_ptr, 0))
|
nuclear@26
|
743 return;
|
nuclear@26
|
744
|
nuclear@26
|
745 if (png_ptr->color_type & PNG_COLOR_MASK_COLOR)
|
nuclear@26
|
746 {
|
nuclear@26
|
747 png_ptr->sig_bit.red = buf[0];
|
nuclear@26
|
748 png_ptr->sig_bit.green = buf[1];
|
nuclear@26
|
749 png_ptr->sig_bit.blue = buf[2];
|
nuclear@26
|
750 png_ptr->sig_bit.alpha = buf[3];
|
nuclear@26
|
751 }
|
nuclear@26
|
752 else
|
nuclear@26
|
753 {
|
nuclear@26
|
754 png_ptr->sig_bit.gray = buf[0];
|
nuclear@26
|
755 png_ptr->sig_bit.red = buf[0];
|
nuclear@26
|
756 png_ptr->sig_bit.green = buf[0];
|
nuclear@26
|
757 png_ptr->sig_bit.blue = buf[0];
|
nuclear@26
|
758 png_ptr->sig_bit.alpha = buf[1];
|
nuclear@26
|
759 }
|
nuclear@26
|
760 png_set_sBIT(png_ptr, info_ptr, &(png_ptr->sig_bit));
|
nuclear@26
|
761 }
|
nuclear@26
|
762 #endif
|
nuclear@26
|
763
|
nuclear@26
|
764 #if defined(PNG_READ_cHRM_SUPPORTED)
|
nuclear@26
|
765 void /* PRIVATE */
|
nuclear@26
|
766 png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
767 {
|
nuclear@26
|
768 png_byte buf[32];
|
nuclear@26
|
769 #ifdef PNG_FLOATING_POINT_SUPPORTED
|
nuclear@26
|
770 float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
|
nuclear@26
|
771 #endif
|
nuclear@26
|
772 png_fixed_point int_x_white, int_y_white, int_x_red, int_y_red, int_x_green,
|
nuclear@26
|
773 int_y_green, int_x_blue, int_y_blue;
|
nuclear@26
|
774
|
nuclear@26
|
775 png_uint_32 uint_x, uint_y;
|
nuclear@26
|
776
|
nuclear@26
|
777 png_debug(1, "in png_handle_cHRM\n");
|
nuclear@26
|
778
|
nuclear@26
|
779 if (!(png_ptr->mode & PNG_HAVE_IHDR))
|
nuclear@26
|
780 png_error(png_ptr, "Missing IHDR before cHRM");
|
nuclear@26
|
781 else if (png_ptr->mode & PNG_HAVE_IDAT)
|
nuclear@26
|
782 {
|
nuclear@26
|
783 png_warning(png_ptr, "Invalid cHRM after IDAT");
|
nuclear@26
|
784 png_crc_finish(png_ptr, length);
|
nuclear@26
|
785 return;
|
nuclear@26
|
786 }
|
nuclear@26
|
787 else if (png_ptr->mode & PNG_HAVE_PLTE)
|
nuclear@26
|
788 /* Should be an error, but we can cope with it */
|
nuclear@26
|
789 png_warning(png_ptr, "Missing PLTE before cHRM");
|
nuclear@26
|
790
|
nuclear@26
|
791 if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)
|
nuclear@26
|
792 #if defined(PNG_READ_sRGB_SUPPORTED)
|
nuclear@26
|
793 && !(info_ptr->valid & PNG_INFO_sRGB)
|
nuclear@26
|
794 #endif
|
nuclear@26
|
795 )
|
nuclear@26
|
796 {
|
nuclear@26
|
797 png_warning(png_ptr, "Duplicate cHRM chunk");
|
nuclear@26
|
798 png_crc_finish(png_ptr, length);
|
nuclear@26
|
799 return;
|
nuclear@26
|
800 }
|
nuclear@26
|
801
|
nuclear@26
|
802 if (length != 32)
|
nuclear@26
|
803 {
|
nuclear@26
|
804 png_warning(png_ptr, "Incorrect cHRM chunk length");
|
nuclear@26
|
805 png_crc_finish(png_ptr, length);
|
nuclear@26
|
806 return;
|
nuclear@26
|
807 }
|
nuclear@26
|
808
|
nuclear@26
|
809 png_crc_read(png_ptr, buf, 32);
|
nuclear@26
|
810 if (png_crc_finish(png_ptr, 0))
|
nuclear@26
|
811 return;
|
nuclear@26
|
812
|
nuclear@26
|
813 uint_x = png_get_uint_32(buf);
|
nuclear@26
|
814 uint_y = png_get_uint_32(buf + 4);
|
nuclear@26
|
815 if (uint_x > 80000L || uint_y > 80000L ||
|
nuclear@26
|
816 uint_x + uint_y > 100000L)
|
nuclear@26
|
817 {
|
nuclear@26
|
818 png_warning(png_ptr, "Invalid cHRM white point");
|
nuclear@26
|
819 return;
|
nuclear@26
|
820 }
|
nuclear@26
|
821 int_x_white = (png_fixed_point)uint_x;
|
nuclear@26
|
822 int_y_white = (png_fixed_point)uint_y;
|
nuclear@26
|
823
|
nuclear@26
|
824 uint_x = png_get_uint_32(buf + 8);
|
nuclear@26
|
825 uint_y = png_get_uint_32(buf + 12);
|
nuclear@26
|
826 if (uint_x + uint_y > 100000L)
|
nuclear@26
|
827 {
|
nuclear@26
|
828 png_warning(png_ptr, "Invalid cHRM red point");
|
nuclear@26
|
829 return;
|
nuclear@26
|
830 }
|
nuclear@26
|
831 int_x_red = (png_fixed_point)uint_x;
|
nuclear@26
|
832 int_y_red = (png_fixed_point)uint_y;
|
nuclear@26
|
833
|
nuclear@26
|
834 uint_x = png_get_uint_32(buf + 16);
|
nuclear@26
|
835 uint_y = png_get_uint_32(buf + 20);
|
nuclear@26
|
836 if (uint_x + uint_y > 100000L)
|
nuclear@26
|
837 {
|
nuclear@26
|
838 png_warning(png_ptr, "Invalid cHRM green point");
|
nuclear@26
|
839 return;
|
nuclear@26
|
840 }
|
nuclear@26
|
841 int_x_green = (png_fixed_point)uint_x;
|
nuclear@26
|
842 int_y_green = (png_fixed_point)uint_y;
|
nuclear@26
|
843
|
nuclear@26
|
844 uint_x = png_get_uint_32(buf + 24);
|
nuclear@26
|
845 uint_y = png_get_uint_32(buf + 28);
|
nuclear@26
|
846 if (uint_x + uint_y > 100000L)
|
nuclear@26
|
847 {
|
nuclear@26
|
848 png_warning(png_ptr, "Invalid cHRM blue point");
|
nuclear@26
|
849 return;
|
nuclear@26
|
850 }
|
nuclear@26
|
851 int_x_blue = (png_fixed_point)uint_x;
|
nuclear@26
|
852 int_y_blue = (png_fixed_point)uint_y;
|
nuclear@26
|
853
|
nuclear@26
|
854 #ifdef PNG_FLOATING_POINT_SUPPORTED
|
nuclear@26
|
855 white_x = (float)int_x_white / (float)100000.0;
|
nuclear@26
|
856 white_y = (float)int_y_white / (float)100000.0;
|
nuclear@26
|
857 red_x = (float)int_x_red / (float)100000.0;
|
nuclear@26
|
858 red_y = (float)int_y_red / (float)100000.0;
|
nuclear@26
|
859 green_x = (float)int_x_green / (float)100000.0;
|
nuclear@26
|
860 green_y = (float)int_y_green / (float)100000.0;
|
nuclear@26
|
861 blue_x = (float)int_x_blue / (float)100000.0;
|
nuclear@26
|
862 blue_y = (float)int_y_blue / (float)100000.0;
|
nuclear@26
|
863 #endif
|
nuclear@26
|
864
|
nuclear@26
|
865 #if defined(PNG_READ_sRGB_SUPPORTED)
|
nuclear@26
|
866 if ((info_ptr != NULL) && (info_ptr->valid & PNG_INFO_sRGB))
|
nuclear@26
|
867 {
|
nuclear@26
|
868 if (PNG_OUT_OF_RANGE(int_x_white, 31270, 1000) ||
|
nuclear@26
|
869 PNG_OUT_OF_RANGE(int_y_white, 32900, 1000) ||
|
nuclear@26
|
870 PNG_OUT_OF_RANGE(int_x_red, 64000L, 1000) ||
|
nuclear@26
|
871 PNG_OUT_OF_RANGE(int_y_red, 33000, 1000) ||
|
nuclear@26
|
872 PNG_OUT_OF_RANGE(int_x_green, 30000, 1000) ||
|
nuclear@26
|
873 PNG_OUT_OF_RANGE(int_y_green, 60000L, 1000) ||
|
nuclear@26
|
874 PNG_OUT_OF_RANGE(int_x_blue, 15000, 1000) ||
|
nuclear@26
|
875 PNG_OUT_OF_RANGE(int_y_blue, 6000, 1000))
|
nuclear@26
|
876 {
|
nuclear@26
|
877 png_warning(png_ptr,
|
nuclear@26
|
878 "Ignoring incorrect cHRM value when sRGB is also present");
|
nuclear@26
|
879 #ifndef PNG_NO_CONSOLE_IO
|
nuclear@26
|
880 #ifdef PNG_FLOATING_POINT_SUPPORTED
|
nuclear@26
|
881 fprintf(stderr, "wx=%f, wy=%f, rx=%f, ry=%f\n",
|
nuclear@26
|
882 white_x, white_y, red_x, red_y);
|
nuclear@26
|
883 fprintf(stderr, "gx=%f, gy=%f, bx=%f, by=%f\n",
|
nuclear@26
|
884 green_x, green_y, blue_x, blue_y);
|
nuclear@26
|
885 #else
|
nuclear@26
|
886 fprintf(stderr, "wx=%ld, wy=%ld, rx=%ld, ry=%ld\n",
|
nuclear@26
|
887 int_x_white, int_y_white, int_x_red, int_y_red);
|
nuclear@26
|
888 fprintf(stderr, "gx=%ld, gy=%ld, bx=%ld, by=%ld\n",
|
nuclear@26
|
889 int_x_green, int_y_green, int_x_blue, int_y_blue);
|
nuclear@26
|
890 #endif
|
nuclear@26
|
891 #endif /* PNG_NO_CONSOLE_IO */
|
nuclear@26
|
892 }
|
nuclear@26
|
893 return;
|
nuclear@26
|
894 }
|
nuclear@26
|
895 #endif /* PNG_READ_sRGB_SUPPORTED */
|
nuclear@26
|
896
|
nuclear@26
|
897 #ifdef PNG_FLOATING_POINT_SUPPORTED
|
nuclear@26
|
898 png_set_cHRM(png_ptr, info_ptr,
|
nuclear@26
|
899 white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
|
nuclear@26
|
900 #endif
|
nuclear@26
|
901 #ifdef PNG_FIXED_POINT_SUPPORTED
|
nuclear@26
|
902 png_set_cHRM_fixed(png_ptr, info_ptr,
|
nuclear@26
|
903 int_x_white, int_y_white, int_x_red, int_y_red, int_x_green,
|
nuclear@26
|
904 int_y_green, int_x_blue, int_y_blue);
|
nuclear@26
|
905 #endif
|
nuclear@26
|
906 }
|
nuclear@26
|
907 #endif
|
nuclear@26
|
908
|
nuclear@26
|
909 #if defined(PNG_READ_sRGB_SUPPORTED)
|
nuclear@26
|
910 void /* PRIVATE */
|
nuclear@26
|
911 png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
912 {
|
nuclear@26
|
913 int intent;
|
nuclear@26
|
914 png_byte buf[1];
|
nuclear@26
|
915
|
nuclear@26
|
916 png_debug(1, "in png_handle_sRGB\n");
|
nuclear@26
|
917
|
nuclear@26
|
918 if (!(png_ptr->mode & PNG_HAVE_IHDR))
|
nuclear@26
|
919 png_error(png_ptr, "Missing IHDR before sRGB");
|
nuclear@26
|
920 else if (png_ptr->mode & PNG_HAVE_IDAT)
|
nuclear@26
|
921 {
|
nuclear@26
|
922 png_warning(png_ptr, "Invalid sRGB after IDAT");
|
nuclear@26
|
923 png_crc_finish(png_ptr, length);
|
nuclear@26
|
924 return;
|
nuclear@26
|
925 }
|
nuclear@26
|
926 else if (png_ptr->mode & PNG_HAVE_PLTE)
|
nuclear@26
|
927 /* Should be an error, but we can cope with it */
|
nuclear@26
|
928 png_warning(png_ptr, "Out of place sRGB chunk");
|
nuclear@26
|
929
|
nuclear@26
|
930 if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB))
|
nuclear@26
|
931 {
|
nuclear@26
|
932 png_warning(png_ptr, "Duplicate sRGB chunk");
|
nuclear@26
|
933 png_crc_finish(png_ptr, length);
|
nuclear@26
|
934 return;
|
nuclear@26
|
935 }
|
nuclear@26
|
936
|
nuclear@26
|
937 if (length != 1)
|
nuclear@26
|
938 {
|
nuclear@26
|
939 png_warning(png_ptr, "Incorrect sRGB chunk length");
|
nuclear@26
|
940 png_crc_finish(png_ptr, length);
|
nuclear@26
|
941 return;
|
nuclear@26
|
942 }
|
nuclear@26
|
943
|
nuclear@26
|
944 png_crc_read(png_ptr, buf, 1);
|
nuclear@26
|
945 if (png_crc_finish(png_ptr, 0))
|
nuclear@26
|
946 return;
|
nuclear@26
|
947
|
nuclear@26
|
948 intent = buf[0];
|
nuclear@26
|
949 /* check for bad intent */
|
nuclear@26
|
950 if (intent >= PNG_sRGB_INTENT_LAST)
|
nuclear@26
|
951 {
|
nuclear@26
|
952 png_warning(png_ptr, "Unknown sRGB intent");
|
nuclear@26
|
953 return;
|
nuclear@26
|
954 }
|
nuclear@26
|
955
|
nuclear@26
|
956 #if defined(PNG_READ_gAMA_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED)
|
nuclear@26
|
957 if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA))
|
nuclear@26
|
958 {
|
nuclear@26
|
959 png_fixed_point igamma;
|
nuclear@26
|
960 #ifdef PNG_FIXED_POINT_SUPPORTED
|
nuclear@26
|
961 igamma=info_ptr->int_gamma;
|
nuclear@26
|
962 #else
|
nuclear@26
|
963 # ifdef PNG_FLOATING_POINT_SUPPORTED
|
nuclear@26
|
964 igamma=(png_fixed_point)(info_ptr->gamma * 100000.);
|
nuclear@26
|
965 # endif
|
nuclear@26
|
966 #endif
|
nuclear@26
|
967 if (PNG_OUT_OF_RANGE(igamma, 45500L, 500))
|
nuclear@26
|
968 {
|
nuclear@26
|
969 png_warning(png_ptr,
|
nuclear@26
|
970 "Ignoring incorrect gAMA value when sRGB is also present");
|
nuclear@26
|
971 #ifndef PNG_NO_CONSOLE_IO
|
nuclear@26
|
972 # ifdef PNG_FIXED_POINT_SUPPORTED
|
nuclear@26
|
973 fprintf(stderr, "incorrect gamma=(%d/100000)\n",
|
nuclear@26
|
974 (int)png_ptr->int_gamma);
|
nuclear@26
|
975 # else
|
nuclear@26
|
976 # ifdef PNG_FLOATING_POINT_SUPPORTED
|
nuclear@26
|
977 fprintf(stderr, "incorrect gamma=%f\n", png_ptr->gamma);
|
nuclear@26
|
978 # endif
|
nuclear@26
|
979 # endif
|
nuclear@26
|
980 #endif
|
nuclear@26
|
981 }
|
nuclear@26
|
982 }
|
nuclear@26
|
983 #endif /* PNG_READ_gAMA_SUPPORTED */
|
nuclear@26
|
984
|
nuclear@26
|
985 #ifdef PNG_READ_cHRM_SUPPORTED
|
nuclear@26
|
986 #ifdef PNG_FIXED_POINT_SUPPORTED
|
nuclear@26
|
987 if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
|
nuclear@26
|
988 if (PNG_OUT_OF_RANGE(info_ptr->int_x_white, 31270, 1000) ||
|
nuclear@26
|
989 PNG_OUT_OF_RANGE(info_ptr->int_y_white, 32900, 1000) ||
|
nuclear@26
|
990 PNG_OUT_OF_RANGE(info_ptr->int_x_red, 64000L, 1000) ||
|
nuclear@26
|
991 PNG_OUT_OF_RANGE(info_ptr->int_y_red, 33000, 1000) ||
|
nuclear@26
|
992 PNG_OUT_OF_RANGE(info_ptr->int_x_green, 30000, 1000) ||
|
nuclear@26
|
993 PNG_OUT_OF_RANGE(info_ptr->int_y_green, 60000L, 1000) ||
|
nuclear@26
|
994 PNG_OUT_OF_RANGE(info_ptr->int_x_blue, 15000, 1000) ||
|
nuclear@26
|
995 PNG_OUT_OF_RANGE(info_ptr->int_y_blue, 6000, 1000))
|
nuclear@26
|
996 {
|
nuclear@26
|
997 png_warning(png_ptr,
|
nuclear@26
|
998 "Ignoring incorrect cHRM value when sRGB is also present");
|
nuclear@26
|
999 }
|
nuclear@26
|
1000 #endif /* PNG_FIXED_POINT_SUPPORTED */
|
nuclear@26
|
1001 #endif /* PNG_READ_cHRM_SUPPORTED */
|
nuclear@26
|
1002
|
nuclear@26
|
1003 png_set_sRGB_gAMA_and_cHRM(png_ptr, info_ptr, intent);
|
nuclear@26
|
1004 }
|
nuclear@26
|
1005 #endif /* PNG_READ_sRGB_SUPPORTED */
|
nuclear@26
|
1006
|
nuclear@26
|
1007 #if defined(PNG_READ_iCCP_SUPPORTED)
|
nuclear@26
|
1008 void /* PRIVATE */
|
nuclear@26
|
1009 png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
1010 /* Note: this does not properly handle chunks that are > 64K under DOS */
|
nuclear@26
|
1011 {
|
nuclear@26
|
1012 png_byte compression_type;
|
nuclear@26
|
1013 png_bytep pC;
|
nuclear@26
|
1014 png_charp profile;
|
nuclear@26
|
1015 png_uint_32 skip = 0;
|
nuclear@26
|
1016 png_uint_32 profile_size, profile_length;
|
nuclear@26
|
1017 png_size_t slength, prefix_length, data_length;
|
nuclear@26
|
1018
|
nuclear@26
|
1019 png_debug(1, "in png_handle_iCCP\n");
|
nuclear@26
|
1020
|
nuclear@26
|
1021 if (!(png_ptr->mode & PNG_HAVE_IHDR))
|
nuclear@26
|
1022 png_error(png_ptr, "Missing IHDR before iCCP");
|
nuclear@26
|
1023 else if (png_ptr->mode & PNG_HAVE_IDAT)
|
nuclear@26
|
1024 {
|
nuclear@26
|
1025 png_warning(png_ptr, "Invalid iCCP after IDAT");
|
nuclear@26
|
1026 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1027 return;
|
nuclear@26
|
1028 }
|
nuclear@26
|
1029 else if (png_ptr->mode & PNG_HAVE_PLTE)
|
nuclear@26
|
1030 /* Should be an error, but we can cope with it */
|
nuclear@26
|
1031 png_warning(png_ptr, "Out of place iCCP chunk");
|
nuclear@26
|
1032
|
nuclear@26
|
1033 if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP))
|
nuclear@26
|
1034 {
|
nuclear@26
|
1035 png_warning(png_ptr, "Duplicate iCCP chunk");
|
nuclear@26
|
1036 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1037 return;
|
nuclear@26
|
1038 }
|
nuclear@26
|
1039
|
nuclear@26
|
1040 #ifdef PNG_MAX_MALLOC_64K
|
nuclear@26
|
1041 if (length > (png_uint_32)65535L)
|
nuclear@26
|
1042 {
|
nuclear@26
|
1043 png_warning(png_ptr, "iCCP chunk too large to fit in memory");
|
nuclear@26
|
1044 skip = length - (png_uint_32)65535L;
|
nuclear@26
|
1045 length = (png_uint_32)65535L;
|
nuclear@26
|
1046 }
|
nuclear@26
|
1047 #endif
|
nuclear@26
|
1048
|
nuclear@26
|
1049 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1050 png_ptr->chunkdata = (png_charp)png_malloc(png_ptr, length + 1);
|
nuclear@26
|
1051 slength = (png_size_t)length;
|
nuclear@26
|
1052 png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
|
nuclear@26
|
1053
|
nuclear@26
|
1054 if (png_crc_finish(png_ptr, skip))
|
nuclear@26
|
1055 {
|
nuclear@26
|
1056 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1057 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1058 return;
|
nuclear@26
|
1059 }
|
nuclear@26
|
1060
|
nuclear@26
|
1061 png_ptr->chunkdata[slength] = 0x00;
|
nuclear@26
|
1062
|
nuclear@26
|
1063 for (profile = png_ptr->chunkdata; *profile; profile++)
|
nuclear@26
|
1064 /* empty loop to find end of name */ ;
|
nuclear@26
|
1065
|
nuclear@26
|
1066 ++profile;
|
nuclear@26
|
1067
|
nuclear@26
|
1068 /* there should be at least one zero (the compression type byte)
|
nuclear@26
|
1069 following the separator, and we should be on it */
|
nuclear@26
|
1070 if ( profile >= png_ptr->chunkdata + slength - 1)
|
nuclear@26
|
1071 {
|
nuclear@26
|
1072 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1073 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1074 png_warning(png_ptr, "Malformed iCCP chunk");
|
nuclear@26
|
1075 return;
|
nuclear@26
|
1076 }
|
nuclear@26
|
1077
|
nuclear@26
|
1078 /* compression_type should always be zero */
|
nuclear@26
|
1079 compression_type = *profile++;
|
nuclear@26
|
1080 if (compression_type)
|
nuclear@26
|
1081 {
|
nuclear@26
|
1082 png_warning(png_ptr, "Ignoring nonzero compression type in iCCP chunk");
|
nuclear@26
|
1083 compression_type = 0x00; /* Reset it to zero (libpng-1.0.6 through 1.0.8
|
nuclear@26
|
1084 wrote nonzero) */
|
nuclear@26
|
1085 }
|
nuclear@26
|
1086
|
nuclear@26
|
1087 prefix_length = profile - png_ptr->chunkdata;
|
nuclear@26
|
1088 png_decompress_chunk(png_ptr, compression_type,
|
nuclear@26
|
1089 slength, prefix_length, &data_length);
|
nuclear@26
|
1090
|
nuclear@26
|
1091 profile_length = data_length - prefix_length;
|
nuclear@26
|
1092
|
nuclear@26
|
1093 if ( prefix_length > data_length || profile_length < 4)
|
nuclear@26
|
1094 {
|
nuclear@26
|
1095 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1096 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1097 png_warning(png_ptr, "Profile size field missing from iCCP chunk");
|
nuclear@26
|
1098 return;
|
nuclear@26
|
1099 }
|
nuclear@26
|
1100
|
nuclear@26
|
1101 /* Check the profile_size recorded in the first 32 bits of the ICC profile */
|
nuclear@26
|
1102 pC = (png_bytep)(png_ptr->chunkdata + prefix_length);
|
nuclear@26
|
1103 profile_size = ((*(pC ))<<24) |
|
nuclear@26
|
1104 ((*(pC + 1))<<16) |
|
nuclear@26
|
1105 ((*(pC + 2))<< 8) |
|
nuclear@26
|
1106 ((*(pC + 3)) );
|
nuclear@26
|
1107
|
nuclear@26
|
1108 if (profile_size < profile_length)
|
nuclear@26
|
1109 profile_length = profile_size;
|
nuclear@26
|
1110
|
nuclear@26
|
1111 if (profile_size > profile_length)
|
nuclear@26
|
1112 {
|
nuclear@26
|
1113 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1114 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1115 png_warning(png_ptr, "Ignoring truncated iCCP profile.");
|
nuclear@26
|
1116 return;
|
nuclear@26
|
1117 }
|
nuclear@26
|
1118
|
nuclear@26
|
1119 png_set_iCCP(png_ptr, info_ptr, png_ptr->chunkdata,
|
nuclear@26
|
1120 compression_type, png_ptr->chunkdata + prefix_length, profile_length);
|
nuclear@26
|
1121 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1122 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1123 }
|
nuclear@26
|
1124 #endif /* PNG_READ_iCCP_SUPPORTED */
|
nuclear@26
|
1125
|
nuclear@26
|
1126 #if defined(PNG_READ_sPLT_SUPPORTED)
|
nuclear@26
|
1127 void /* PRIVATE */
|
nuclear@26
|
1128 png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
1129 /* Note: this does not properly handle chunks that are > 64K under DOS */
|
nuclear@26
|
1130 {
|
nuclear@26
|
1131 png_bytep entry_start;
|
nuclear@26
|
1132 png_sPLT_t new_palette;
|
nuclear@26
|
1133 #ifdef PNG_NO_POINTER_INDEXING
|
nuclear@26
|
1134 png_sPLT_entryp pp;
|
nuclear@26
|
1135 #endif
|
nuclear@26
|
1136 int data_length, entry_size, i;
|
nuclear@26
|
1137 png_uint_32 skip = 0;
|
nuclear@26
|
1138 png_size_t slength;
|
nuclear@26
|
1139
|
nuclear@26
|
1140 png_debug(1, "in png_handle_sPLT\n");
|
nuclear@26
|
1141
|
nuclear@26
|
1142 if (!(png_ptr->mode & PNG_HAVE_IHDR))
|
nuclear@26
|
1143 png_error(png_ptr, "Missing IHDR before sPLT");
|
nuclear@26
|
1144 else if (png_ptr->mode & PNG_HAVE_IDAT)
|
nuclear@26
|
1145 {
|
nuclear@26
|
1146 png_warning(png_ptr, "Invalid sPLT after IDAT");
|
nuclear@26
|
1147 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1148 return;
|
nuclear@26
|
1149 }
|
nuclear@26
|
1150
|
nuclear@26
|
1151 #ifdef PNG_MAX_MALLOC_64K
|
nuclear@26
|
1152 if (length > (png_uint_32)65535L)
|
nuclear@26
|
1153 {
|
nuclear@26
|
1154 png_warning(png_ptr, "sPLT chunk too large to fit in memory");
|
nuclear@26
|
1155 skip = length - (png_uint_32)65535L;
|
nuclear@26
|
1156 length = (png_uint_32)65535L;
|
nuclear@26
|
1157 }
|
nuclear@26
|
1158 #endif
|
nuclear@26
|
1159
|
nuclear@26
|
1160 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1161 png_ptr->chunkdata = (png_charp)png_malloc(png_ptr, length + 1);
|
nuclear@26
|
1162 slength = (png_size_t)length;
|
nuclear@26
|
1163 png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
|
nuclear@26
|
1164
|
nuclear@26
|
1165 if (png_crc_finish(png_ptr, skip))
|
nuclear@26
|
1166 {
|
nuclear@26
|
1167 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1168 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1169 return;
|
nuclear@26
|
1170 }
|
nuclear@26
|
1171
|
nuclear@26
|
1172 png_ptr->chunkdata[slength] = 0x00;
|
nuclear@26
|
1173
|
nuclear@26
|
1174 for (entry_start = (png_bytep)png_ptr->chunkdata; *entry_start; entry_start++)
|
nuclear@26
|
1175 /* empty loop to find end of name */ ;
|
nuclear@26
|
1176 ++entry_start;
|
nuclear@26
|
1177
|
nuclear@26
|
1178 /* a sample depth should follow the separator, and we should be on it */
|
nuclear@26
|
1179 if (entry_start > (png_bytep)png_ptr->chunkdata + slength - 2)
|
nuclear@26
|
1180 {
|
nuclear@26
|
1181 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1182 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1183 png_warning(png_ptr, "malformed sPLT chunk");
|
nuclear@26
|
1184 return;
|
nuclear@26
|
1185 }
|
nuclear@26
|
1186
|
nuclear@26
|
1187 new_palette.depth = *entry_start++;
|
nuclear@26
|
1188 entry_size = (new_palette.depth == 8 ? 6 : 10);
|
nuclear@26
|
1189 data_length = (slength - (entry_start - (png_bytep)png_ptr->chunkdata));
|
nuclear@26
|
1190
|
nuclear@26
|
1191 /* integrity-check the data length */
|
nuclear@26
|
1192 if (data_length % entry_size)
|
nuclear@26
|
1193 {
|
nuclear@26
|
1194 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1195 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1196 png_warning(png_ptr, "sPLT chunk has bad length");
|
nuclear@26
|
1197 return;
|
nuclear@26
|
1198 }
|
nuclear@26
|
1199
|
nuclear@26
|
1200 new_palette.nentries = (png_int_32) ( data_length / entry_size);
|
nuclear@26
|
1201 if ((png_uint_32) new_palette.nentries >
|
nuclear@26
|
1202 (png_uint_32) (PNG_SIZE_MAX / png_sizeof(png_sPLT_entry)))
|
nuclear@26
|
1203 {
|
nuclear@26
|
1204 png_warning(png_ptr, "sPLT chunk too long");
|
nuclear@26
|
1205 return;
|
nuclear@26
|
1206 }
|
nuclear@26
|
1207 new_palette.entries = (png_sPLT_entryp)png_malloc_warn(
|
nuclear@26
|
1208 png_ptr, new_palette.nentries * png_sizeof(png_sPLT_entry));
|
nuclear@26
|
1209 if (new_palette.entries == NULL)
|
nuclear@26
|
1210 {
|
nuclear@26
|
1211 png_warning(png_ptr, "sPLT chunk requires too much memory");
|
nuclear@26
|
1212 return;
|
nuclear@26
|
1213 }
|
nuclear@26
|
1214
|
nuclear@26
|
1215 #ifndef PNG_NO_POINTER_INDEXING
|
nuclear@26
|
1216 for (i = 0; i < new_palette.nentries; i++)
|
nuclear@26
|
1217 {
|
nuclear@26
|
1218 png_sPLT_entryp pp = new_palette.entries + i;
|
nuclear@26
|
1219
|
nuclear@26
|
1220 if (new_palette.depth == 8)
|
nuclear@26
|
1221 {
|
nuclear@26
|
1222 pp->red = *entry_start++;
|
nuclear@26
|
1223 pp->green = *entry_start++;
|
nuclear@26
|
1224 pp->blue = *entry_start++;
|
nuclear@26
|
1225 pp->alpha = *entry_start++;
|
nuclear@26
|
1226 }
|
nuclear@26
|
1227 else
|
nuclear@26
|
1228 {
|
nuclear@26
|
1229 pp->red = png_get_uint_16(entry_start); entry_start += 2;
|
nuclear@26
|
1230 pp->green = png_get_uint_16(entry_start); entry_start += 2;
|
nuclear@26
|
1231 pp->blue = png_get_uint_16(entry_start); entry_start += 2;
|
nuclear@26
|
1232 pp->alpha = png_get_uint_16(entry_start); entry_start += 2;
|
nuclear@26
|
1233 }
|
nuclear@26
|
1234 pp->frequency = png_get_uint_16(entry_start); entry_start += 2;
|
nuclear@26
|
1235 }
|
nuclear@26
|
1236 #else
|
nuclear@26
|
1237 pp = new_palette.entries;
|
nuclear@26
|
1238 for (i = 0; i < new_palette.nentries; i++)
|
nuclear@26
|
1239 {
|
nuclear@26
|
1240
|
nuclear@26
|
1241 if (new_palette.depth == 8)
|
nuclear@26
|
1242 {
|
nuclear@26
|
1243 pp[i].red = *entry_start++;
|
nuclear@26
|
1244 pp[i].green = *entry_start++;
|
nuclear@26
|
1245 pp[i].blue = *entry_start++;
|
nuclear@26
|
1246 pp[i].alpha = *entry_start++;
|
nuclear@26
|
1247 }
|
nuclear@26
|
1248 else
|
nuclear@26
|
1249 {
|
nuclear@26
|
1250 pp[i].red = png_get_uint_16(entry_start); entry_start += 2;
|
nuclear@26
|
1251 pp[i].green = png_get_uint_16(entry_start); entry_start += 2;
|
nuclear@26
|
1252 pp[i].blue = png_get_uint_16(entry_start); entry_start += 2;
|
nuclear@26
|
1253 pp[i].alpha = png_get_uint_16(entry_start); entry_start += 2;
|
nuclear@26
|
1254 }
|
nuclear@26
|
1255 pp->frequency = png_get_uint_16(entry_start); entry_start += 2;
|
nuclear@26
|
1256 }
|
nuclear@26
|
1257 #endif
|
nuclear@26
|
1258
|
nuclear@26
|
1259 /* discard all chunk data except the name and stash that */
|
nuclear@26
|
1260 new_palette.name = png_ptr->chunkdata;
|
nuclear@26
|
1261
|
nuclear@26
|
1262 png_set_sPLT(png_ptr, info_ptr, &new_palette, 1);
|
nuclear@26
|
1263
|
nuclear@26
|
1264 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1265 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1266 png_free(png_ptr, new_palette.entries);
|
nuclear@26
|
1267 }
|
nuclear@26
|
1268 #endif /* PNG_READ_sPLT_SUPPORTED */
|
nuclear@26
|
1269
|
nuclear@26
|
1270 #if defined(PNG_READ_tRNS_SUPPORTED)
|
nuclear@26
|
1271 void /* PRIVATE */
|
nuclear@26
|
1272 png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
1273 {
|
nuclear@26
|
1274 png_byte readbuf[PNG_MAX_PALETTE_LENGTH];
|
nuclear@26
|
1275
|
nuclear@26
|
1276 png_debug(1, "in png_handle_tRNS\n");
|
nuclear@26
|
1277
|
nuclear@26
|
1278 if (!(png_ptr->mode & PNG_HAVE_IHDR))
|
nuclear@26
|
1279 png_error(png_ptr, "Missing IHDR before tRNS");
|
nuclear@26
|
1280 else if (png_ptr->mode & PNG_HAVE_IDAT)
|
nuclear@26
|
1281 {
|
nuclear@26
|
1282 png_warning(png_ptr, "Invalid tRNS after IDAT");
|
nuclear@26
|
1283 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1284 return;
|
nuclear@26
|
1285 }
|
nuclear@26
|
1286 else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
|
nuclear@26
|
1287 {
|
nuclear@26
|
1288 png_warning(png_ptr, "Duplicate tRNS chunk");
|
nuclear@26
|
1289 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1290 return;
|
nuclear@26
|
1291 }
|
nuclear@26
|
1292
|
nuclear@26
|
1293 if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
|
nuclear@26
|
1294 {
|
nuclear@26
|
1295 png_byte buf[2];
|
nuclear@26
|
1296
|
nuclear@26
|
1297 if (length != 2)
|
nuclear@26
|
1298 {
|
nuclear@26
|
1299 png_warning(png_ptr, "Incorrect tRNS chunk length");
|
nuclear@26
|
1300 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1301 return;
|
nuclear@26
|
1302 }
|
nuclear@26
|
1303
|
nuclear@26
|
1304 png_crc_read(png_ptr, buf, 2);
|
nuclear@26
|
1305 png_ptr->num_trans = 1;
|
nuclear@26
|
1306 png_ptr->trans_values.gray = png_get_uint_16(buf);
|
nuclear@26
|
1307 }
|
nuclear@26
|
1308 else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
|
nuclear@26
|
1309 {
|
nuclear@26
|
1310 png_byte buf[6];
|
nuclear@26
|
1311
|
nuclear@26
|
1312 if (length != 6)
|
nuclear@26
|
1313 {
|
nuclear@26
|
1314 png_warning(png_ptr, "Incorrect tRNS chunk length");
|
nuclear@26
|
1315 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1316 return;
|
nuclear@26
|
1317 }
|
nuclear@26
|
1318 png_crc_read(png_ptr, buf, (png_size_t)length);
|
nuclear@26
|
1319 png_ptr->num_trans = 1;
|
nuclear@26
|
1320 png_ptr->trans_values.red = png_get_uint_16(buf);
|
nuclear@26
|
1321 png_ptr->trans_values.green = png_get_uint_16(buf + 2);
|
nuclear@26
|
1322 png_ptr->trans_values.blue = png_get_uint_16(buf + 4);
|
nuclear@26
|
1323 }
|
nuclear@26
|
1324 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
|
nuclear@26
|
1325 {
|
nuclear@26
|
1326 if (!(png_ptr->mode & PNG_HAVE_PLTE))
|
nuclear@26
|
1327 {
|
nuclear@26
|
1328 /* Should be an error, but we can cope with it. */
|
nuclear@26
|
1329 png_warning(png_ptr, "Missing PLTE before tRNS");
|
nuclear@26
|
1330 }
|
nuclear@26
|
1331 if (length > (png_uint_32)png_ptr->num_palette ||
|
nuclear@26
|
1332 length > PNG_MAX_PALETTE_LENGTH)
|
nuclear@26
|
1333 {
|
nuclear@26
|
1334 png_warning(png_ptr, "Incorrect tRNS chunk length");
|
nuclear@26
|
1335 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1336 return;
|
nuclear@26
|
1337 }
|
nuclear@26
|
1338 if (length == 0)
|
nuclear@26
|
1339 {
|
nuclear@26
|
1340 png_warning(png_ptr, "Zero length tRNS chunk");
|
nuclear@26
|
1341 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1342 return;
|
nuclear@26
|
1343 }
|
nuclear@26
|
1344 png_crc_read(png_ptr, readbuf, (png_size_t)length);
|
nuclear@26
|
1345 png_ptr->num_trans = (png_uint_16)length;
|
nuclear@26
|
1346 }
|
nuclear@26
|
1347 else
|
nuclear@26
|
1348 {
|
nuclear@26
|
1349 png_warning(png_ptr, "tRNS chunk not allowed with alpha channel");
|
nuclear@26
|
1350 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1351 return;
|
nuclear@26
|
1352 }
|
nuclear@26
|
1353
|
nuclear@26
|
1354 if (png_crc_finish(png_ptr, 0))
|
nuclear@26
|
1355 {
|
nuclear@26
|
1356 png_ptr->num_trans = 0;
|
nuclear@26
|
1357 return;
|
nuclear@26
|
1358 }
|
nuclear@26
|
1359
|
nuclear@26
|
1360 png_set_tRNS(png_ptr, info_ptr, readbuf, png_ptr->num_trans,
|
nuclear@26
|
1361 &(png_ptr->trans_values));
|
nuclear@26
|
1362 }
|
nuclear@26
|
1363 #endif
|
nuclear@26
|
1364
|
nuclear@26
|
1365 #if defined(PNG_READ_bKGD_SUPPORTED)
|
nuclear@26
|
1366 void /* PRIVATE */
|
nuclear@26
|
1367 png_handle_bKGD(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
1368 {
|
nuclear@26
|
1369 png_size_t truelen;
|
nuclear@26
|
1370 png_byte buf[6];
|
nuclear@26
|
1371
|
nuclear@26
|
1372 png_debug(1, "in png_handle_bKGD\n");
|
nuclear@26
|
1373
|
nuclear@26
|
1374 if (!(png_ptr->mode & PNG_HAVE_IHDR))
|
nuclear@26
|
1375 png_error(png_ptr, "Missing IHDR before bKGD");
|
nuclear@26
|
1376 else if (png_ptr->mode & PNG_HAVE_IDAT)
|
nuclear@26
|
1377 {
|
nuclear@26
|
1378 png_warning(png_ptr, "Invalid bKGD after IDAT");
|
nuclear@26
|
1379 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1380 return;
|
nuclear@26
|
1381 }
|
nuclear@26
|
1382 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
|
nuclear@26
|
1383 !(png_ptr->mode & PNG_HAVE_PLTE))
|
nuclear@26
|
1384 {
|
nuclear@26
|
1385 png_warning(png_ptr, "Missing PLTE before bKGD");
|
nuclear@26
|
1386 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1387 return;
|
nuclear@26
|
1388 }
|
nuclear@26
|
1389 else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD))
|
nuclear@26
|
1390 {
|
nuclear@26
|
1391 png_warning(png_ptr, "Duplicate bKGD chunk");
|
nuclear@26
|
1392 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1393 return;
|
nuclear@26
|
1394 }
|
nuclear@26
|
1395
|
nuclear@26
|
1396 if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
|
nuclear@26
|
1397 truelen = 1;
|
nuclear@26
|
1398 else if (png_ptr->color_type & PNG_COLOR_MASK_COLOR)
|
nuclear@26
|
1399 truelen = 6;
|
nuclear@26
|
1400 else
|
nuclear@26
|
1401 truelen = 2;
|
nuclear@26
|
1402
|
nuclear@26
|
1403 if (length != truelen)
|
nuclear@26
|
1404 {
|
nuclear@26
|
1405 png_warning(png_ptr, "Incorrect bKGD chunk length");
|
nuclear@26
|
1406 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1407 return;
|
nuclear@26
|
1408 }
|
nuclear@26
|
1409
|
nuclear@26
|
1410 png_crc_read(png_ptr, buf, truelen);
|
nuclear@26
|
1411 if (png_crc_finish(png_ptr, 0))
|
nuclear@26
|
1412 return;
|
nuclear@26
|
1413
|
nuclear@26
|
1414 /* We convert the index value into RGB components so that we can allow
|
nuclear@26
|
1415 * arbitrary RGB values for background when we have transparency, and
|
nuclear@26
|
1416 * so it is easy to determine the RGB values of the background color
|
nuclear@26
|
1417 * from the info_ptr struct. */
|
nuclear@26
|
1418 if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
|
nuclear@26
|
1419 {
|
nuclear@26
|
1420 png_ptr->background.index = buf[0];
|
nuclear@26
|
1421 if (info_ptr && info_ptr->num_palette)
|
nuclear@26
|
1422 {
|
nuclear@26
|
1423 if (buf[0] > info_ptr->num_palette)
|
nuclear@26
|
1424 {
|
nuclear@26
|
1425 png_warning(png_ptr, "Incorrect bKGD chunk index value");
|
nuclear@26
|
1426 return;
|
nuclear@26
|
1427 }
|
nuclear@26
|
1428 png_ptr->background.red =
|
nuclear@26
|
1429 (png_uint_16)png_ptr->palette[buf[0]].red;
|
nuclear@26
|
1430 png_ptr->background.green =
|
nuclear@26
|
1431 (png_uint_16)png_ptr->palette[buf[0]].green;
|
nuclear@26
|
1432 png_ptr->background.blue =
|
nuclear@26
|
1433 (png_uint_16)png_ptr->palette[buf[0]].blue;
|
nuclear@26
|
1434 }
|
nuclear@26
|
1435 }
|
nuclear@26
|
1436 else if (!(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) /* GRAY */
|
nuclear@26
|
1437 {
|
nuclear@26
|
1438 png_ptr->background.red =
|
nuclear@26
|
1439 png_ptr->background.green =
|
nuclear@26
|
1440 png_ptr->background.blue =
|
nuclear@26
|
1441 png_ptr->background.gray = png_get_uint_16(buf);
|
nuclear@26
|
1442 }
|
nuclear@26
|
1443 else
|
nuclear@26
|
1444 {
|
nuclear@26
|
1445 png_ptr->background.red = png_get_uint_16(buf);
|
nuclear@26
|
1446 png_ptr->background.green = png_get_uint_16(buf + 2);
|
nuclear@26
|
1447 png_ptr->background.blue = png_get_uint_16(buf + 4);
|
nuclear@26
|
1448 }
|
nuclear@26
|
1449
|
nuclear@26
|
1450 png_set_bKGD(png_ptr, info_ptr, &(png_ptr->background));
|
nuclear@26
|
1451 }
|
nuclear@26
|
1452 #endif
|
nuclear@26
|
1453
|
nuclear@26
|
1454 #if defined(PNG_READ_hIST_SUPPORTED)
|
nuclear@26
|
1455 void /* PRIVATE */
|
nuclear@26
|
1456 png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
1457 {
|
nuclear@26
|
1458 unsigned int num, i;
|
nuclear@26
|
1459 png_uint_16 readbuf[PNG_MAX_PALETTE_LENGTH];
|
nuclear@26
|
1460
|
nuclear@26
|
1461 png_debug(1, "in png_handle_hIST\n");
|
nuclear@26
|
1462
|
nuclear@26
|
1463 if (!(png_ptr->mode & PNG_HAVE_IHDR))
|
nuclear@26
|
1464 png_error(png_ptr, "Missing IHDR before hIST");
|
nuclear@26
|
1465 else if (png_ptr->mode & PNG_HAVE_IDAT)
|
nuclear@26
|
1466 {
|
nuclear@26
|
1467 png_warning(png_ptr, "Invalid hIST after IDAT");
|
nuclear@26
|
1468 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1469 return;
|
nuclear@26
|
1470 }
|
nuclear@26
|
1471 else if (!(png_ptr->mode & PNG_HAVE_PLTE))
|
nuclear@26
|
1472 {
|
nuclear@26
|
1473 png_warning(png_ptr, "Missing PLTE before hIST");
|
nuclear@26
|
1474 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1475 return;
|
nuclear@26
|
1476 }
|
nuclear@26
|
1477 else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST))
|
nuclear@26
|
1478 {
|
nuclear@26
|
1479 png_warning(png_ptr, "Duplicate hIST chunk");
|
nuclear@26
|
1480 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1481 return;
|
nuclear@26
|
1482 }
|
nuclear@26
|
1483
|
nuclear@26
|
1484 num = length / 2 ;
|
nuclear@26
|
1485 if (num != (unsigned int) png_ptr->num_palette || num >
|
nuclear@26
|
1486 (unsigned int) PNG_MAX_PALETTE_LENGTH)
|
nuclear@26
|
1487 {
|
nuclear@26
|
1488 png_warning(png_ptr, "Incorrect hIST chunk length");
|
nuclear@26
|
1489 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1490 return;
|
nuclear@26
|
1491 }
|
nuclear@26
|
1492
|
nuclear@26
|
1493 for (i = 0; i < num; i++)
|
nuclear@26
|
1494 {
|
nuclear@26
|
1495 png_byte buf[2];
|
nuclear@26
|
1496
|
nuclear@26
|
1497 png_crc_read(png_ptr, buf, 2);
|
nuclear@26
|
1498 readbuf[i] = png_get_uint_16(buf);
|
nuclear@26
|
1499 }
|
nuclear@26
|
1500
|
nuclear@26
|
1501 if (png_crc_finish(png_ptr, 0))
|
nuclear@26
|
1502 return;
|
nuclear@26
|
1503
|
nuclear@26
|
1504 png_set_hIST(png_ptr, info_ptr, readbuf);
|
nuclear@26
|
1505 }
|
nuclear@26
|
1506 #endif
|
nuclear@26
|
1507
|
nuclear@26
|
1508 #if defined(PNG_READ_pHYs_SUPPORTED)
|
nuclear@26
|
1509 void /* PRIVATE */
|
nuclear@26
|
1510 png_handle_pHYs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
1511 {
|
nuclear@26
|
1512 png_byte buf[9];
|
nuclear@26
|
1513 png_uint_32 res_x, res_y;
|
nuclear@26
|
1514 int unit_type;
|
nuclear@26
|
1515
|
nuclear@26
|
1516 png_debug(1, "in png_handle_pHYs\n");
|
nuclear@26
|
1517
|
nuclear@26
|
1518 if (!(png_ptr->mode & PNG_HAVE_IHDR))
|
nuclear@26
|
1519 png_error(png_ptr, "Missing IHDR before pHYs");
|
nuclear@26
|
1520 else if (png_ptr->mode & PNG_HAVE_IDAT)
|
nuclear@26
|
1521 {
|
nuclear@26
|
1522 png_warning(png_ptr, "Invalid pHYs after IDAT");
|
nuclear@26
|
1523 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1524 return;
|
nuclear@26
|
1525 }
|
nuclear@26
|
1526 else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
|
nuclear@26
|
1527 {
|
nuclear@26
|
1528 png_warning(png_ptr, "Duplicate pHYs chunk");
|
nuclear@26
|
1529 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1530 return;
|
nuclear@26
|
1531 }
|
nuclear@26
|
1532
|
nuclear@26
|
1533 if (length != 9)
|
nuclear@26
|
1534 {
|
nuclear@26
|
1535 png_warning(png_ptr, "Incorrect pHYs chunk length");
|
nuclear@26
|
1536 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1537 return;
|
nuclear@26
|
1538 }
|
nuclear@26
|
1539
|
nuclear@26
|
1540 png_crc_read(png_ptr, buf, 9);
|
nuclear@26
|
1541 if (png_crc_finish(png_ptr, 0))
|
nuclear@26
|
1542 return;
|
nuclear@26
|
1543
|
nuclear@26
|
1544 res_x = png_get_uint_32(buf);
|
nuclear@26
|
1545 res_y = png_get_uint_32(buf + 4);
|
nuclear@26
|
1546 unit_type = buf[8];
|
nuclear@26
|
1547 png_set_pHYs(png_ptr, info_ptr, res_x, res_y, unit_type);
|
nuclear@26
|
1548 }
|
nuclear@26
|
1549 #endif
|
nuclear@26
|
1550
|
nuclear@26
|
1551 #if defined(PNG_READ_oFFs_SUPPORTED)
|
nuclear@26
|
1552 void /* PRIVATE */
|
nuclear@26
|
1553 png_handle_oFFs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
1554 {
|
nuclear@26
|
1555 png_byte buf[9];
|
nuclear@26
|
1556 png_int_32 offset_x, offset_y;
|
nuclear@26
|
1557 int unit_type;
|
nuclear@26
|
1558
|
nuclear@26
|
1559 png_debug(1, "in png_handle_oFFs\n");
|
nuclear@26
|
1560
|
nuclear@26
|
1561 if (!(png_ptr->mode & PNG_HAVE_IHDR))
|
nuclear@26
|
1562 png_error(png_ptr, "Missing IHDR before oFFs");
|
nuclear@26
|
1563 else if (png_ptr->mode & PNG_HAVE_IDAT)
|
nuclear@26
|
1564 {
|
nuclear@26
|
1565 png_warning(png_ptr, "Invalid oFFs after IDAT");
|
nuclear@26
|
1566 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1567 return;
|
nuclear@26
|
1568 }
|
nuclear@26
|
1569 else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
|
nuclear@26
|
1570 {
|
nuclear@26
|
1571 png_warning(png_ptr, "Duplicate oFFs chunk");
|
nuclear@26
|
1572 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1573 return;
|
nuclear@26
|
1574 }
|
nuclear@26
|
1575
|
nuclear@26
|
1576 if (length != 9)
|
nuclear@26
|
1577 {
|
nuclear@26
|
1578 png_warning(png_ptr, "Incorrect oFFs chunk length");
|
nuclear@26
|
1579 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1580 return;
|
nuclear@26
|
1581 }
|
nuclear@26
|
1582
|
nuclear@26
|
1583 png_crc_read(png_ptr, buf, 9);
|
nuclear@26
|
1584 if (png_crc_finish(png_ptr, 0))
|
nuclear@26
|
1585 return;
|
nuclear@26
|
1586
|
nuclear@26
|
1587 offset_x = png_get_int_32(buf);
|
nuclear@26
|
1588 offset_y = png_get_int_32(buf + 4);
|
nuclear@26
|
1589 unit_type = buf[8];
|
nuclear@26
|
1590 png_set_oFFs(png_ptr, info_ptr, offset_x, offset_y, unit_type);
|
nuclear@26
|
1591 }
|
nuclear@26
|
1592 #endif
|
nuclear@26
|
1593
|
nuclear@26
|
1594 #if defined(PNG_READ_pCAL_SUPPORTED)
|
nuclear@26
|
1595 /* read the pCAL chunk (described in the PNG Extensions document) */
|
nuclear@26
|
1596 void /* PRIVATE */
|
nuclear@26
|
1597 png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
1598 {
|
nuclear@26
|
1599 png_int_32 X0, X1;
|
nuclear@26
|
1600 png_byte type, nparams;
|
nuclear@26
|
1601 png_charp buf, units, endptr;
|
nuclear@26
|
1602 png_charpp params;
|
nuclear@26
|
1603 png_size_t slength;
|
nuclear@26
|
1604 int i;
|
nuclear@26
|
1605
|
nuclear@26
|
1606 png_debug(1, "in png_handle_pCAL\n");
|
nuclear@26
|
1607
|
nuclear@26
|
1608 if (!(png_ptr->mode & PNG_HAVE_IHDR))
|
nuclear@26
|
1609 png_error(png_ptr, "Missing IHDR before pCAL");
|
nuclear@26
|
1610 else if (png_ptr->mode & PNG_HAVE_IDAT)
|
nuclear@26
|
1611 {
|
nuclear@26
|
1612 png_warning(png_ptr, "Invalid pCAL after IDAT");
|
nuclear@26
|
1613 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1614 return;
|
nuclear@26
|
1615 }
|
nuclear@26
|
1616 else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL))
|
nuclear@26
|
1617 {
|
nuclear@26
|
1618 png_warning(png_ptr, "Duplicate pCAL chunk");
|
nuclear@26
|
1619 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1620 return;
|
nuclear@26
|
1621 }
|
nuclear@26
|
1622
|
nuclear@26
|
1623 png_debug1(2, "Allocating and reading pCAL chunk data (%lu bytes)\n",
|
nuclear@26
|
1624 length + 1);
|
nuclear@26
|
1625 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1626 png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
|
nuclear@26
|
1627 if (png_ptr->chunkdata == NULL)
|
nuclear@26
|
1628 {
|
nuclear@26
|
1629 png_warning(png_ptr, "No memory for pCAL purpose.");
|
nuclear@26
|
1630 return;
|
nuclear@26
|
1631 }
|
nuclear@26
|
1632 slength = (png_size_t)length;
|
nuclear@26
|
1633 png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
|
nuclear@26
|
1634
|
nuclear@26
|
1635 if (png_crc_finish(png_ptr, 0))
|
nuclear@26
|
1636 {
|
nuclear@26
|
1637 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1638 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1639 return;
|
nuclear@26
|
1640 }
|
nuclear@26
|
1641
|
nuclear@26
|
1642 png_ptr->chunkdata[slength] = 0x00; /* null terminate the last string */
|
nuclear@26
|
1643
|
nuclear@26
|
1644 png_debug(3, "Finding end of pCAL purpose string\n");
|
nuclear@26
|
1645 for (buf = png_ptr->chunkdata; *buf; buf++)
|
nuclear@26
|
1646 /* empty loop */ ;
|
nuclear@26
|
1647
|
nuclear@26
|
1648 endptr = png_ptr->chunkdata + slength;
|
nuclear@26
|
1649
|
nuclear@26
|
1650 /* We need to have at least 12 bytes after the purpose string
|
nuclear@26
|
1651 in order to get the parameter information. */
|
nuclear@26
|
1652 if (endptr <= buf + 12)
|
nuclear@26
|
1653 {
|
nuclear@26
|
1654 png_warning(png_ptr, "Invalid pCAL data");
|
nuclear@26
|
1655 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1656 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1657 return;
|
nuclear@26
|
1658 }
|
nuclear@26
|
1659
|
nuclear@26
|
1660 png_debug(3, "Reading pCAL X0, X1, type, nparams, and units\n");
|
nuclear@26
|
1661 X0 = png_get_int_32((png_bytep)buf+1);
|
nuclear@26
|
1662 X1 = png_get_int_32((png_bytep)buf+5);
|
nuclear@26
|
1663 type = buf[9];
|
nuclear@26
|
1664 nparams = buf[10];
|
nuclear@26
|
1665 units = buf + 11;
|
nuclear@26
|
1666
|
nuclear@26
|
1667 png_debug(3, "Checking pCAL equation type and number of parameters\n");
|
nuclear@26
|
1668 /* Check that we have the right number of parameters for known
|
nuclear@26
|
1669 equation types. */
|
nuclear@26
|
1670 if ((type == PNG_EQUATION_LINEAR && nparams != 2) ||
|
nuclear@26
|
1671 (type == PNG_EQUATION_BASE_E && nparams != 3) ||
|
nuclear@26
|
1672 (type == PNG_EQUATION_ARBITRARY && nparams != 3) ||
|
nuclear@26
|
1673 (type == PNG_EQUATION_HYPERBOLIC && nparams != 4))
|
nuclear@26
|
1674 {
|
nuclear@26
|
1675 png_warning(png_ptr, "Invalid pCAL parameters for equation type");
|
nuclear@26
|
1676 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1677 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1678 return;
|
nuclear@26
|
1679 }
|
nuclear@26
|
1680 else if (type >= PNG_EQUATION_LAST)
|
nuclear@26
|
1681 {
|
nuclear@26
|
1682 png_warning(png_ptr, "Unrecognized equation type for pCAL chunk");
|
nuclear@26
|
1683 }
|
nuclear@26
|
1684
|
nuclear@26
|
1685 for (buf = units; *buf; buf++)
|
nuclear@26
|
1686 /* Empty loop to move past the units string. */ ;
|
nuclear@26
|
1687
|
nuclear@26
|
1688 png_debug(3, "Allocating pCAL parameters array\n");
|
nuclear@26
|
1689 params = (png_charpp)png_malloc_warn(png_ptr,
|
nuclear@26
|
1690 (png_uint_32)(nparams * png_sizeof(png_charp))) ;
|
nuclear@26
|
1691 if (params == NULL)
|
nuclear@26
|
1692 {
|
nuclear@26
|
1693 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1694 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1695 png_warning(png_ptr, "No memory for pCAL params.");
|
nuclear@26
|
1696 return;
|
nuclear@26
|
1697 }
|
nuclear@26
|
1698
|
nuclear@26
|
1699 /* Get pointers to the start of each parameter string. */
|
nuclear@26
|
1700 for (i = 0; i < (int)nparams; i++)
|
nuclear@26
|
1701 {
|
nuclear@26
|
1702 buf++; /* Skip the null string terminator from previous parameter. */
|
nuclear@26
|
1703
|
nuclear@26
|
1704 png_debug1(3, "Reading pCAL parameter %d\n", i);
|
nuclear@26
|
1705 for (params[i] = buf; buf <= endptr && *buf != 0x00; buf++)
|
nuclear@26
|
1706 /* Empty loop to move past each parameter string */ ;
|
nuclear@26
|
1707
|
nuclear@26
|
1708 /* Make sure we haven't run out of data yet */
|
nuclear@26
|
1709 if (buf > endptr)
|
nuclear@26
|
1710 {
|
nuclear@26
|
1711 png_warning(png_ptr, "Invalid pCAL data");
|
nuclear@26
|
1712 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1713 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1714 png_free(png_ptr, params);
|
nuclear@26
|
1715 return;
|
nuclear@26
|
1716 }
|
nuclear@26
|
1717 }
|
nuclear@26
|
1718
|
nuclear@26
|
1719 png_set_pCAL(png_ptr, info_ptr, png_ptr->chunkdata, X0, X1, type, nparams,
|
nuclear@26
|
1720 units, params);
|
nuclear@26
|
1721
|
nuclear@26
|
1722 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1723 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1724 png_free(png_ptr, params);
|
nuclear@26
|
1725 }
|
nuclear@26
|
1726 #endif
|
nuclear@26
|
1727
|
nuclear@26
|
1728 #if defined(PNG_READ_sCAL_SUPPORTED)
|
nuclear@26
|
1729 /* read the sCAL chunk */
|
nuclear@26
|
1730 void /* PRIVATE */
|
nuclear@26
|
1731 png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
1732 {
|
nuclear@26
|
1733 png_charp ep;
|
nuclear@26
|
1734 #ifdef PNG_FLOATING_POINT_SUPPORTED
|
nuclear@26
|
1735 double width, height;
|
nuclear@26
|
1736 png_charp vp;
|
nuclear@26
|
1737 #else
|
nuclear@26
|
1738 #ifdef PNG_FIXED_POINT_SUPPORTED
|
nuclear@26
|
1739 png_charp swidth, sheight;
|
nuclear@26
|
1740 #endif
|
nuclear@26
|
1741 #endif
|
nuclear@26
|
1742 png_size_t slength;
|
nuclear@26
|
1743
|
nuclear@26
|
1744 png_debug(1, "in png_handle_sCAL\n");
|
nuclear@26
|
1745
|
nuclear@26
|
1746 if (!(png_ptr->mode & PNG_HAVE_IHDR))
|
nuclear@26
|
1747 png_error(png_ptr, "Missing IHDR before sCAL");
|
nuclear@26
|
1748 else if (png_ptr->mode & PNG_HAVE_IDAT)
|
nuclear@26
|
1749 {
|
nuclear@26
|
1750 png_warning(png_ptr, "Invalid sCAL after IDAT");
|
nuclear@26
|
1751 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1752 return;
|
nuclear@26
|
1753 }
|
nuclear@26
|
1754 else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sCAL))
|
nuclear@26
|
1755 {
|
nuclear@26
|
1756 png_warning(png_ptr, "Duplicate sCAL chunk");
|
nuclear@26
|
1757 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1758 return;
|
nuclear@26
|
1759 }
|
nuclear@26
|
1760
|
nuclear@26
|
1761 png_debug1(2, "Allocating and reading sCAL chunk data (%lu bytes)\n",
|
nuclear@26
|
1762 length + 1);
|
nuclear@26
|
1763 png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
|
nuclear@26
|
1764 if (png_ptr->chunkdata == NULL)
|
nuclear@26
|
1765 {
|
nuclear@26
|
1766 png_warning(png_ptr, "Out of memory while processing sCAL chunk");
|
nuclear@26
|
1767 return;
|
nuclear@26
|
1768 }
|
nuclear@26
|
1769 slength = (png_size_t)length;
|
nuclear@26
|
1770 png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
|
nuclear@26
|
1771
|
nuclear@26
|
1772 if (png_crc_finish(png_ptr, 0))
|
nuclear@26
|
1773 {
|
nuclear@26
|
1774 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1775 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1776 return;
|
nuclear@26
|
1777 }
|
nuclear@26
|
1778
|
nuclear@26
|
1779 png_ptr->chunkdata[slength] = 0x00; /* null terminate the last string */
|
nuclear@26
|
1780
|
nuclear@26
|
1781 ep = png_ptr->chunkdata + 1; /* skip unit byte */
|
nuclear@26
|
1782
|
nuclear@26
|
1783 #ifdef PNG_FLOATING_POINT_SUPPORTED
|
nuclear@26
|
1784 width = png_strtod(png_ptr, ep, &vp);
|
nuclear@26
|
1785 if (*vp)
|
nuclear@26
|
1786 {
|
nuclear@26
|
1787 png_warning(png_ptr, "malformed width string in sCAL chunk");
|
nuclear@26
|
1788 return;
|
nuclear@26
|
1789 }
|
nuclear@26
|
1790 #else
|
nuclear@26
|
1791 #ifdef PNG_FIXED_POINT_SUPPORTED
|
nuclear@26
|
1792 swidth = (png_charp)png_malloc_warn(png_ptr, png_strlen(ep) + 1);
|
nuclear@26
|
1793 if (swidth == NULL)
|
nuclear@26
|
1794 {
|
nuclear@26
|
1795 png_warning(png_ptr, "Out of memory while processing sCAL chunk width");
|
nuclear@26
|
1796 return;
|
nuclear@26
|
1797 }
|
nuclear@26
|
1798 png_memcpy(swidth, ep, (png_size_t)png_strlen(ep));
|
nuclear@26
|
1799 #endif
|
nuclear@26
|
1800 #endif
|
nuclear@26
|
1801
|
nuclear@26
|
1802 for (ep = png_ptr->chunkdata; *ep; ep++)
|
nuclear@26
|
1803 /* empty loop */ ;
|
nuclear@26
|
1804 ep++;
|
nuclear@26
|
1805
|
nuclear@26
|
1806 if (png_ptr->chunkdata + slength < ep)
|
nuclear@26
|
1807 {
|
nuclear@26
|
1808 png_warning(png_ptr, "Truncated sCAL chunk");
|
nuclear@26
|
1809 #if defined(PNG_FIXED_POINT_SUPPORTED) && \
|
nuclear@26
|
1810 !defined(PNG_FLOATING_POINT_SUPPORTED)
|
nuclear@26
|
1811 png_free(png_ptr, swidth);
|
nuclear@26
|
1812 #endif
|
nuclear@26
|
1813 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1814 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1815 return;
|
nuclear@26
|
1816 }
|
nuclear@26
|
1817
|
nuclear@26
|
1818 #ifdef PNG_FLOATING_POINT_SUPPORTED
|
nuclear@26
|
1819 height = png_strtod(png_ptr, ep, &vp);
|
nuclear@26
|
1820 if (*vp)
|
nuclear@26
|
1821 {
|
nuclear@26
|
1822 png_warning(png_ptr, "malformed height string in sCAL chunk");
|
nuclear@26
|
1823 return;
|
nuclear@26
|
1824 }
|
nuclear@26
|
1825 #else
|
nuclear@26
|
1826 #ifdef PNG_FIXED_POINT_SUPPORTED
|
nuclear@26
|
1827 sheight = (png_charp)png_malloc_warn(png_ptr, png_strlen(ep) + 1);
|
nuclear@26
|
1828 if (sheight == NULL)
|
nuclear@26
|
1829 {
|
nuclear@26
|
1830 png_warning(png_ptr, "Out of memory while processing sCAL chunk height");
|
nuclear@26
|
1831 return;
|
nuclear@26
|
1832 }
|
nuclear@26
|
1833 png_memcpy(sheight, ep, (png_size_t)png_strlen(ep));
|
nuclear@26
|
1834 #endif
|
nuclear@26
|
1835 #endif
|
nuclear@26
|
1836
|
nuclear@26
|
1837 if (png_ptr->chunkdata + slength < ep
|
nuclear@26
|
1838 #ifdef PNG_FLOATING_POINT_SUPPORTED
|
nuclear@26
|
1839 || width <= 0. || height <= 0.
|
nuclear@26
|
1840 #endif
|
nuclear@26
|
1841 )
|
nuclear@26
|
1842 {
|
nuclear@26
|
1843 png_warning(png_ptr, "Invalid sCAL data");
|
nuclear@26
|
1844 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1845 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1846 #if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
|
nuclear@26
|
1847 png_free(png_ptr, swidth);
|
nuclear@26
|
1848 png_free(png_ptr, sheight);
|
nuclear@26
|
1849 #endif
|
nuclear@26
|
1850 return;
|
nuclear@26
|
1851 }
|
nuclear@26
|
1852
|
nuclear@26
|
1853
|
nuclear@26
|
1854 #ifdef PNG_FLOATING_POINT_SUPPORTED
|
nuclear@26
|
1855 png_set_sCAL(png_ptr, info_ptr, png_ptr->chunkdata[0], width, height);
|
nuclear@26
|
1856 #else
|
nuclear@26
|
1857 #ifdef PNG_FIXED_POINT_SUPPORTED
|
nuclear@26
|
1858 png_set_sCAL_s(png_ptr, info_ptr, png_ptr->chunkdata[0], swidth, sheight);
|
nuclear@26
|
1859 #endif
|
nuclear@26
|
1860 #endif
|
nuclear@26
|
1861
|
nuclear@26
|
1862 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1863 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1864 #if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
|
nuclear@26
|
1865 png_free(png_ptr, swidth);
|
nuclear@26
|
1866 png_free(png_ptr, sheight);
|
nuclear@26
|
1867 #endif
|
nuclear@26
|
1868 }
|
nuclear@26
|
1869 #endif
|
nuclear@26
|
1870
|
nuclear@26
|
1871 #if defined(PNG_READ_tIME_SUPPORTED)
|
nuclear@26
|
1872 void /* PRIVATE */
|
nuclear@26
|
1873 png_handle_tIME(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
1874 {
|
nuclear@26
|
1875 png_byte buf[7];
|
nuclear@26
|
1876 png_time mod_time;
|
nuclear@26
|
1877
|
nuclear@26
|
1878 png_debug(1, "in png_handle_tIME\n");
|
nuclear@26
|
1879
|
nuclear@26
|
1880 if (!(png_ptr->mode & PNG_HAVE_IHDR))
|
nuclear@26
|
1881 png_error(png_ptr, "Out of place tIME chunk");
|
nuclear@26
|
1882 else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME))
|
nuclear@26
|
1883 {
|
nuclear@26
|
1884 png_warning(png_ptr, "Duplicate tIME chunk");
|
nuclear@26
|
1885 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1886 return;
|
nuclear@26
|
1887 }
|
nuclear@26
|
1888
|
nuclear@26
|
1889 if (png_ptr->mode & PNG_HAVE_IDAT)
|
nuclear@26
|
1890 png_ptr->mode |= PNG_AFTER_IDAT;
|
nuclear@26
|
1891
|
nuclear@26
|
1892 if (length != 7)
|
nuclear@26
|
1893 {
|
nuclear@26
|
1894 png_warning(png_ptr, "Incorrect tIME chunk length");
|
nuclear@26
|
1895 png_crc_finish(png_ptr, length);
|
nuclear@26
|
1896 return;
|
nuclear@26
|
1897 }
|
nuclear@26
|
1898
|
nuclear@26
|
1899 png_crc_read(png_ptr, buf, 7);
|
nuclear@26
|
1900 if (png_crc_finish(png_ptr, 0))
|
nuclear@26
|
1901 return;
|
nuclear@26
|
1902
|
nuclear@26
|
1903 mod_time.second = buf[6];
|
nuclear@26
|
1904 mod_time.minute = buf[5];
|
nuclear@26
|
1905 mod_time.hour = buf[4];
|
nuclear@26
|
1906 mod_time.day = buf[3];
|
nuclear@26
|
1907 mod_time.month = buf[2];
|
nuclear@26
|
1908 mod_time.year = png_get_uint_16(buf);
|
nuclear@26
|
1909
|
nuclear@26
|
1910 png_set_tIME(png_ptr, info_ptr, &mod_time);
|
nuclear@26
|
1911 }
|
nuclear@26
|
1912 #endif
|
nuclear@26
|
1913
|
nuclear@26
|
1914 #if defined(PNG_READ_tEXt_SUPPORTED)
|
nuclear@26
|
1915 /* Note: this does not properly handle chunks that are > 64K under DOS */
|
nuclear@26
|
1916 void /* PRIVATE */
|
nuclear@26
|
1917 png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
1918 {
|
nuclear@26
|
1919 png_textp text_ptr;
|
nuclear@26
|
1920 png_charp key;
|
nuclear@26
|
1921 png_charp text;
|
nuclear@26
|
1922 png_uint_32 skip = 0;
|
nuclear@26
|
1923 png_size_t slength;
|
nuclear@26
|
1924 int ret;
|
nuclear@26
|
1925
|
nuclear@26
|
1926 png_debug(1, "in png_handle_tEXt\n");
|
nuclear@26
|
1927
|
nuclear@26
|
1928 if (!(png_ptr->mode & PNG_HAVE_IHDR))
|
nuclear@26
|
1929 png_error(png_ptr, "Missing IHDR before tEXt");
|
nuclear@26
|
1930
|
nuclear@26
|
1931 if (png_ptr->mode & PNG_HAVE_IDAT)
|
nuclear@26
|
1932 png_ptr->mode |= PNG_AFTER_IDAT;
|
nuclear@26
|
1933
|
nuclear@26
|
1934 #ifdef PNG_MAX_MALLOC_64K
|
nuclear@26
|
1935 if (length > (png_uint_32)65535L)
|
nuclear@26
|
1936 {
|
nuclear@26
|
1937 png_warning(png_ptr, "tEXt chunk too large to fit in memory");
|
nuclear@26
|
1938 skip = length - (png_uint_32)65535L;
|
nuclear@26
|
1939 length = (png_uint_32)65535L;
|
nuclear@26
|
1940 }
|
nuclear@26
|
1941 #endif
|
nuclear@26
|
1942
|
nuclear@26
|
1943 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1944 png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
|
nuclear@26
|
1945 if (png_ptr->chunkdata == NULL)
|
nuclear@26
|
1946 {
|
nuclear@26
|
1947 png_warning(png_ptr, "No memory to process text chunk.");
|
nuclear@26
|
1948 return;
|
nuclear@26
|
1949 }
|
nuclear@26
|
1950 slength = (png_size_t)length;
|
nuclear@26
|
1951 png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
|
nuclear@26
|
1952
|
nuclear@26
|
1953 if (png_crc_finish(png_ptr, skip))
|
nuclear@26
|
1954 {
|
nuclear@26
|
1955 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1956 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1957 return;
|
nuclear@26
|
1958 }
|
nuclear@26
|
1959
|
nuclear@26
|
1960 key = png_ptr->chunkdata;
|
nuclear@26
|
1961 key[slength] = 0x00;
|
nuclear@26
|
1962
|
nuclear@26
|
1963 for (text = key; *text; text++)
|
nuclear@26
|
1964 /* empty loop to find end of key */ ;
|
nuclear@26
|
1965
|
nuclear@26
|
1966 if (text != key + slength)
|
nuclear@26
|
1967 text++;
|
nuclear@26
|
1968
|
nuclear@26
|
1969 text_ptr = (png_textp)png_malloc_warn(png_ptr,
|
nuclear@26
|
1970 (png_uint_32)png_sizeof(png_text));
|
nuclear@26
|
1971 if (text_ptr == NULL)
|
nuclear@26
|
1972 {
|
nuclear@26
|
1973 png_warning(png_ptr, "Not enough memory to process text chunk.");
|
nuclear@26
|
1974 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1975 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1976 return;
|
nuclear@26
|
1977 }
|
nuclear@26
|
1978 text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
|
nuclear@26
|
1979 text_ptr->key = key;
|
nuclear@26
|
1980 #ifdef PNG_iTXt_SUPPORTED
|
nuclear@26
|
1981 text_ptr->lang = NULL;
|
nuclear@26
|
1982 text_ptr->lang_key = NULL;
|
nuclear@26
|
1983 text_ptr->itxt_length = 0;
|
nuclear@26
|
1984 #endif
|
nuclear@26
|
1985 text_ptr->text = text;
|
nuclear@26
|
1986 text_ptr->text_length = png_strlen(text);
|
nuclear@26
|
1987
|
nuclear@26
|
1988 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
|
nuclear@26
|
1989
|
nuclear@26
|
1990 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
1991 png_ptr->chunkdata = NULL;
|
nuclear@26
|
1992 png_free(png_ptr, text_ptr);
|
nuclear@26
|
1993 if (ret)
|
nuclear@26
|
1994 png_warning(png_ptr, "Insufficient memory to process text chunk.");
|
nuclear@26
|
1995 }
|
nuclear@26
|
1996 #endif
|
nuclear@26
|
1997
|
nuclear@26
|
1998 #if defined(PNG_READ_zTXt_SUPPORTED)
|
nuclear@26
|
1999 /* note: this does not correctly handle chunks that are > 64K under DOS */
|
nuclear@26
|
2000 void /* PRIVATE */
|
nuclear@26
|
2001 png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
2002 {
|
nuclear@26
|
2003 png_textp text_ptr;
|
nuclear@26
|
2004 png_charp text;
|
nuclear@26
|
2005 int comp_type;
|
nuclear@26
|
2006 int ret;
|
nuclear@26
|
2007 png_size_t slength, prefix_len, data_len;
|
nuclear@26
|
2008
|
nuclear@26
|
2009 png_debug(1, "in png_handle_zTXt\n");
|
nuclear@26
|
2010 if (!(png_ptr->mode & PNG_HAVE_IHDR))
|
nuclear@26
|
2011 png_error(png_ptr, "Missing IHDR before zTXt");
|
nuclear@26
|
2012
|
nuclear@26
|
2013 if (png_ptr->mode & PNG_HAVE_IDAT)
|
nuclear@26
|
2014 png_ptr->mode |= PNG_AFTER_IDAT;
|
nuclear@26
|
2015
|
nuclear@26
|
2016 #ifdef PNG_MAX_MALLOC_64K
|
nuclear@26
|
2017 /* We will no doubt have problems with chunks even half this size, but
|
nuclear@26
|
2018 there is no hard and fast rule to tell us where to stop. */
|
nuclear@26
|
2019 if (length > (png_uint_32)65535L)
|
nuclear@26
|
2020 {
|
nuclear@26
|
2021 png_warning(png_ptr, "zTXt chunk too large to fit in memory");
|
nuclear@26
|
2022 png_crc_finish(png_ptr, length);
|
nuclear@26
|
2023 return;
|
nuclear@26
|
2024 }
|
nuclear@26
|
2025 #endif
|
nuclear@26
|
2026
|
nuclear@26
|
2027 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
2028 png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
|
nuclear@26
|
2029 if (png_ptr->chunkdata == NULL)
|
nuclear@26
|
2030 {
|
nuclear@26
|
2031 png_warning(png_ptr, "Out of memory processing zTXt chunk.");
|
nuclear@26
|
2032 return;
|
nuclear@26
|
2033 }
|
nuclear@26
|
2034 slength = (png_size_t)length;
|
nuclear@26
|
2035 png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
|
nuclear@26
|
2036 if (png_crc_finish(png_ptr, 0))
|
nuclear@26
|
2037 {
|
nuclear@26
|
2038 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
2039 png_ptr->chunkdata = NULL;
|
nuclear@26
|
2040 return;
|
nuclear@26
|
2041 }
|
nuclear@26
|
2042
|
nuclear@26
|
2043 png_ptr->chunkdata[slength] = 0x00;
|
nuclear@26
|
2044
|
nuclear@26
|
2045 for (text = png_ptr->chunkdata; *text; text++)
|
nuclear@26
|
2046 /* empty loop */ ;
|
nuclear@26
|
2047
|
nuclear@26
|
2048 /* zTXt must have some text after the chunkdataword */
|
nuclear@26
|
2049 if (text >= png_ptr->chunkdata + slength - 2)
|
nuclear@26
|
2050 {
|
nuclear@26
|
2051 png_warning(png_ptr, "Truncated zTXt chunk");
|
nuclear@26
|
2052 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
2053 png_ptr->chunkdata = NULL;
|
nuclear@26
|
2054 return;
|
nuclear@26
|
2055 }
|
nuclear@26
|
2056 else
|
nuclear@26
|
2057 {
|
nuclear@26
|
2058 comp_type = *(++text);
|
nuclear@26
|
2059 if (comp_type != PNG_TEXT_COMPRESSION_zTXt)
|
nuclear@26
|
2060 {
|
nuclear@26
|
2061 png_warning(png_ptr, "Unknown compression type in zTXt chunk");
|
nuclear@26
|
2062 comp_type = PNG_TEXT_COMPRESSION_zTXt;
|
nuclear@26
|
2063 }
|
nuclear@26
|
2064 text++; /* skip the compression_method byte */
|
nuclear@26
|
2065 }
|
nuclear@26
|
2066 prefix_len = text - png_ptr->chunkdata;
|
nuclear@26
|
2067
|
nuclear@26
|
2068 png_decompress_chunk(png_ptr, comp_type,
|
nuclear@26
|
2069 (png_size_t)length, prefix_len, &data_len);
|
nuclear@26
|
2070
|
nuclear@26
|
2071 text_ptr = (png_textp)png_malloc_warn(png_ptr,
|
nuclear@26
|
2072 (png_uint_32)png_sizeof(png_text));
|
nuclear@26
|
2073 if (text_ptr == NULL)
|
nuclear@26
|
2074 {
|
nuclear@26
|
2075 png_warning(png_ptr, "Not enough memory to process zTXt chunk.");
|
nuclear@26
|
2076 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
2077 png_ptr->chunkdata = NULL;
|
nuclear@26
|
2078 return;
|
nuclear@26
|
2079 }
|
nuclear@26
|
2080 text_ptr->compression = comp_type;
|
nuclear@26
|
2081 text_ptr->key = png_ptr->chunkdata;
|
nuclear@26
|
2082 #ifdef PNG_iTXt_SUPPORTED
|
nuclear@26
|
2083 text_ptr->lang = NULL;
|
nuclear@26
|
2084 text_ptr->lang_key = NULL;
|
nuclear@26
|
2085 text_ptr->itxt_length = 0;
|
nuclear@26
|
2086 #endif
|
nuclear@26
|
2087 text_ptr->text = png_ptr->chunkdata + prefix_len;
|
nuclear@26
|
2088 text_ptr->text_length = data_len;
|
nuclear@26
|
2089
|
nuclear@26
|
2090 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
|
nuclear@26
|
2091
|
nuclear@26
|
2092 png_free(png_ptr, text_ptr);
|
nuclear@26
|
2093 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
2094 png_ptr->chunkdata = NULL;
|
nuclear@26
|
2095 if (ret)
|
nuclear@26
|
2096 png_error(png_ptr, "Insufficient memory to store zTXt chunk.");
|
nuclear@26
|
2097 }
|
nuclear@26
|
2098 #endif
|
nuclear@26
|
2099
|
nuclear@26
|
2100 #if defined(PNG_READ_iTXt_SUPPORTED)
|
nuclear@26
|
2101 /* note: this does not correctly handle chunks that are > 64K under DOS */
|
nuclear@26
|
2102 void /* PRIVATE */
|
nuclear@26
|
2103 png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
2104 {
|
nuclear@26
|
2105 png_textp text_ptr;
|
nuclear@26
|
2106 png_charp key, lang, text, lang_key;
|
nuclear@26
|
2107 int comp_flag;
|
nuclear@26
|
2108 int comp_type = 0;
|
nuclear@26
|
2109 int ret;
|
nuclear@26
|
2110 png_size_t slength, prefix_len, data_len;
|
nuclear@26
|
2111
|
nuclear@26
|
2112 png_debug(1, "in png_handle_iTXt\n");
|
nuclear@26
|
2113
|
nuclear@26
|
2114 if (!(png_ptr->mode & PNG_HAVE_IHDR))
|
nuclear@26
|
2115 png_error(png_ptr, "Missing IHDR before iTXt");
|
nuclear@26
|
2116
|
nuclear@26
|
2117 if (png_ptr->mode & PNG_HAVE_IDAT)
|
nuclear@26
|
2118 png_ptr->mode |= PNG_AFTER_IDAT;
|
nuclear@26
|
2119
|
nuclear@26
|
2120 #ifdef PNG_MAX_MALLOC_64K
|
nuclear@26
|
2121 /* We will no doubt have problems with chunks even half this size, but
|
nuclear@26
|
2122 there is no hard and fast rule to tell us where to stop. */
|
nuclear@26
|
2123 if (length > (png_uint_32)65535L)
|
nuclear@26
|
2124 {
|
nuclear@26
|
2125 png_warning(png_ptr, "iTXt chunk too large to fit in memory");
|
nuclear@26
|
2126 png_crc_finish(png_ptr, length);
|
nuclear@26
|
2127 return;
|
nuclear@26
|
2128 }
|
nuclear@26
|
2129 #endif
|
nuclear@26
|
2130
|
nuclear@26
|
2131 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
2132 png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
|
nuclear@26
|
2133 if (png_ptr->chunkdata == NULL)
|
nuclear@26
|
2134 {
|
nuclear@26
|
2135 png_warning(png_ptr, "No memory to process iTXt chunk.");
|
nuclear@26
|
2136 return;
|
nuclear@26
|
2137 }
|
nuclear@26
|
2138 slength = (png_size_t)length;
|
nuclear@26
|
2139 png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
|
nuclear@26
|
2140 if (png_crc_finish(png_ptr, 0))
|
nuclear@26
|
2141 {
|
nuclear@26
|
2142 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
2143 png_ptr->chunkdata = NULL;
|
nuclear@26
|
2144 return;
|
nuclear@26
|
2145 }
|
nuclear@26
|
2146
|
nuclear@26
|
2147 png_ptr->chunkdata[slength] = 0x00;
|
nuclear@26
|
2148
|
nuclear@26
|
2149 for (lang = png_ptr->chunkdata; *lang; lang++)
|
nuclear@26
|
2150 /* empty loop */ ;
|
nuclear@26
|
2151 lang++; /* skip NUL separator */
|
nuclear@26
|
2152
|
nuclear@26
|
2153 /* iTXt must have a language tag (possibly empty), two compression bytes,
|
nuclear@26
|
2154 translated keyword (possibly empty), and possibly some text after the
|
nuclear@26
|
2155 keyword */
|
nuclear@26
|
2156
|
nuclear@26
|
2157 if (lang >= png_ptr->chunkdata + slength - 3)
|
nuclear@26
|
2158 {
|
nuclear@26
|
2159 png_warning(png_ptr, "Truncated iTXt chunk");
|
nuclear@26
|
2160 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
2161 png_ptr->chunkdata = NULL;
|
nuclear@26
|
2162 return;
|
nuclear@26
|
2163 }
|
nuclear@26
|
2164 else
|
nuclear@26
|
2165 {
|
nuclear@26
|
2166 comp_flag = *lang++;
|
nuclear@26
|
2167 comp_type = *lang++;
|
nuclear@26
|
2168 }
|
nuclear@26
|
2169
|
nuclear@26
|
2170 for (lang_key = lang; *lang_key; lang_key++)
|
nuclear@26
|
2171 /* empty loop */ ;
|
nuclear@26
|
2172 lang_key++; /* skip NUL separator */
|
nuclear@26
|
2173
|
nuclear@26
|
2174 if (lang_key >= png_ptr->chunkdata + slength)
|
nuclear@26
|
2175 {
|
nuclear@26
|
2176 png_warning(png_ptr, "Truncated iTXt chunk");
|
nuclear@26
|
2177 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
2178 png_ptr->chunkdata = NULL;
|
nuclear@26
|
2179 return;
|
nuclear@26
|
2180 }
|
nuclear@26
|
2181
|
nuclear@26
|
2182 for (text = lang_key; *text; text++)
|
nuclear@26
|
2183 /* empty loop */ ;
|
nuclear@26
|
2184 text++; /* skip NUL separator */
|
nuclear@26
|
2185 if (text >= png_ptr->chunkdata + slength)
|
nuclear@26
|
2186 {
|
nuclear@26
|
2187 png_warning(png_ptr, "Malformed iTXt chunk");
|
nuclear@26
|
2188 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
2189 png_ptr->chunkdata = NULL;
|
nuclear@26
|
2190 return;
|
nuclear@26
|
2191 }
|
nuclear@26
|
2192
|
nuclear@26
|
2193 prefix_len = text - png_ptr->chunkdata;
|
nuclear@26
|
2194
|
nuclear@26
|
2195 key=png_ptr->chunkdata;
|
nuclear@26
|
2196 if (comp_flag)
|
nuclear@26
|
2197 png_decompress_chunk(png_ptr, comp_type,
|
nuclear@26
|
2198 (size_t)length, prefix_len, &data_len);
|
nuclear@26
|
2199 else
|
nuclear@26
|
2200 data_len = png_strlen(png_ptr->chunkdata + prefix_len);
|
nuclear@26
|
2201 text_ptr = (png_textp)png_malloc_warn(png_ptr,
|
nuclear@26
|
2202 (png_uint_32)png_sizeof(png_text));
|
nuclear@26
|
2203 if (text_ptr == NULL)
|
nuclear@26
|
2204 {
|
nuclear@26
|
2205 png_warning(png_ptr, "Not enough memory to process iTXt chunk.");
|
nuclear@26
|
2206 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
2207 png_ptr->chunkdata = NULL;
|
nuclear@26
|
2208 return;
|
nuclear@26
|
2209 }
|
nuclear@26
|
2210 text_ptr->compression = (int)comp_flag + 1;
|
nuclear@26
|
2211 text_ptr->lang_key = png_ptr->chunkdata + (lang_key - key);
|
nuclear@26
|
2212 text_ptr->lang = png_ptr->chunkdata + (lang - key);
|
nuclear@26
|
2213 text_ptr->itxt_length = data_len;
|
nuclear@26
|
2214 text_ptr->text_length = 0;
|
nuclear@26
|
2215 text_ptr->key = png_ptr->chunkdata;
|
nuclear@26
|
2216 text_ptr->text = png_ptr->chunkdata + prefix_len;
|
nuclear@26
|
2217
|
nuclear@26
|
2218 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
|
nuclear@26
|
2219
|
nuclear@26
|
2220 png_free(png_ptr, text_ptr);
|
nuclear@26
|
2221 png_free(png_ptr, png_ptr->chunkdata);
|
nuclear@26
|
2222 png_ptr->chunkdata = NULL;
|
nuclear@26
|
2223 if (ret)
|
nuclear@26
|
2224 png_error(png_ptr, "Insufficient memory to store iTXt chunk.");
|
nuclear@26
|
2225 }
|
nuclear@26
|
2226 #endif
|
nuclear@26
|
2227
|
nuclear@26
|
2228 /* This function is called when we haven't found a handler for a
|
nuclear@26
|
2229 chunk. If there isn't a problem with the chunk itself (ie bad
|
nuclear@26
|
2230 chunk name, CRC, or a critical chunk), the chunk is silently ignored
|
nuclear@26
|
2231 -- unless the PNG_FLAG_UNKNOWN_CHUNKS_SUPPORTED flag is on in which
|
nuclear@26
|
2232 case it will be saved away to be written out later. */
|
nuclear@26
|
2233 void /* PRIVATE */
|
nuclear@26
|
2234 png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
nuclear@26
|
2235 {
|
nuclear@26
|
2236 png_uint_32 skip = 0;
|
nuclear@26
|
2237
|
nuclear@26
|
2238 png_debug(1, "in png_handle_unknown\n");
|
nuclear@26
|
2239
|
nuclear@26
|
2240 if (png_ptr->mode & PNG_HAVE_IDAT)
|
nuclear@26
|
2241 {
|
nuclear@26
|
2242 #ifdef PNG_USE_LOCAL_ARRAYS
|
nuclear@26
|
2243 PNG_CONST PNG_IDAT;
|
nuclear@26
|
2244 #endif
|
nuclear@26
|
2245 if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) /* not an IDAT */
|
nuclear@26
|
2246 png_ptr->mode |= PNG_AFTER_IDAT;
|
nuclear@26
|
2247 }
|
nuclear@26
|
2248
|
nuclear@26
|
2249 if (!(png_ptr->chunk_name[0] & 0x20))
|
nuclear@26
|
2250 {
|
nuclear@26
|
2251 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
|
nuclear@26
|
2252 if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
|
nuclear@26
|
2253 PNG_HANDLE_CHUNK_ALWAYS
|
nuclear@26
|
2254 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
|
nuclear@26
|
2255 && png_ptr->read_user_chunk_fn == NULL
|
nuclear@26
|
2256 #endif
|
nuclear@26
|
2257 )
|
nuclear@26
|
2258 #endif
|
nuclear@26
|
2259 png_chunk_error(png_ptr, "unknown critical chunk");
|
nuclear@26
|
2260 }
|
nuclear@26
|
2261
|
nuclear@26
|
2262 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
|
nuclear@26
|
2263 if ((png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS) ||
|
nuclear@26
|
2264 (png_ptr->read_user_chunk_fn != NULL))
|
nuclear@26
|
2265 {
|
nuclear@26
|
2266 #ifdef PNG_MAX_MALLOC_64K
|
nuclear@26
|
2267 if (length > (png_uint_32)65535L)
|
nuclear@26
|
2268 {
|
nuclear@26
|
2269 png_warning(png_ptr, "unknown chunk too large to fit in memory");
|
nuclear@26
|
2270 skip = length - (png_uint_32)65535L;
|
nuclear@26
|
2271 length = (png_uint_32)65535L;
|
nuclear@26
|
2272 }
|
nuclear@26
|
2273 #endif
|
nuclear@26
|
2274 png_memcpy((png_charp)png_ptr->unknown_chunk.name,
|
nuclear@26
|
2275 (png_charp)png_ptr->chunk_name,
|
nuclear@26
|
2276 png_sizeof(png_ptr->unknown_chunk.name));
|
nuclear@26
|
2277 png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name)-1] = '\0';
|
nuclear@26
|
2278 png_ptr->unknown_chunk.size = (png_size_t)length;
|
nuclear@26
|
2279 if (length == 0)
|
nuclear@26
|
2280 png_ptr->unknown_chunk.data = NULL;
|
nuclear@26
|
2281 else
|
nuclear@26
|
2282 {
|
nuclear@26
|
2283 png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, length);
|
nuclear@26
|
2284 png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length);
|
nuclear@26
|
2285 }
|
nuclear@26
|
2286 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
|
nuclear@26
|
2287 if (png_ptr->read_user_chunk_fn != NULL)
|
nuclear@26
|
2288 {
|
nuclear@26
|
2289 /* callback to user unknown chunk handler */
|
nuclear@26
|
2290 int ret;
|
nuclear@26
|
2291 ret = (*(png_ptr->read_user_chunk_fn))
|
nuclear@26
|
2292 (png_ptr, &png_ptr->unknown_chunk);
|
nuclear@26
|
2293 if (ret < 0)
|
nuclear@26
|
2294 png_chunk_error(png_ptr, "error in user chunk");
|
nuclear@26
|
2295 if (ret == 0)
|
nuclear@26
|
2296 {
|
nuclear@26
|
2297 if (!(png_ptr->chunk_name[0] & 0x20))
|
nuclear@26
|
2298 if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
|
nuclear@26
|
2299 PNG_HANDLE_CHUNK_ALWAYS)
|
nuclear@26
|
2300 png_chunk_error(png_ptr, "unknown critical chunk");
|
nuclear@26
|
2301 png_set_unknown_chunks(png_ptr, info_ptr,
|
nuclear@26
|
2302 &png_ptr->unknown_chunk, 1);
|
nuclear@26
|
2303 }
|
nuclear@26
|
2304 }
|
nuclear@26
|
2305 else
|
nuclear@26
|
2306 #endif
|
nuclear@26
|
2307 png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1);
|
nuclear@26
|
2308 png_free(png_ptr, png_ptr->unknown_chunk.data);
|
nuclear@26
|
2309 png_ptr->unknown_chunk.data = NULL;
|
nuclear@26
|
2310 }
|
nuclear@26
|
2311 else
|
nuclear@26
|
2312 #endif
|
nuclear@26
|
2313 skip = length;
|
nuclear@26
|
2314
|
nuclear@26
|
2315 png_crc_finish(png_ptr, skip);
|
nuclear@26
|
2316
|
nuclear@26
|
2317 #if !defined(PNG_READ_USER_CHUNKS_SUPPORTED)
|
nuclear@26
|
2318 info_ptr = info_ptr; /* quiet compiler warnings about unused info_ptr */
|
nuclear@26
|
2319 #endif
|
nuclear@26
|
2320 }
|
nuclear@26
|
2321
|
nuclear@26
|
2322 /* This function is called to verify that a chunk name is valid.
|
nuclear@26
|
2323 This function can't have the "critical chunk check" incorporated
|
nuclear@26
|
2324 into it, since in the future we will need to be able to call user
|
nuclear@26
|
2325 functions to handle unknown critical chunks after we check that
|
nuclear@26
|
2326 the chunk name itself is valid. */
|
nuclear@26
|
2327
|
nuclear@26
|
2328 #define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
|
nuclear@26
|
2329
|
nuclear@26
|
2330 void /* PRIVATE */
|
nuclear@26
|
2331 png_check_chunk_name(png_structp png_ptr, png_bytep chunk_name)
|
nuclear@26
|
2332 {
|
nuclear@26
|
2333 png_debug(1, "in png_check_chunk_name\n");
|
nuclear@26
|
2334 if (isnonalpha(chunk_name[0]) || isnonalpha(chunk_name[1]) ||
|
nuclear@26
|
2335 isnonalpha(chunk_name[2]) || isnonalpha(chunk_name[3]))
|
nuclear@26
|
2336 {
|
nuclear@26
|
2337 png_chunk_error(png_ptr, "invalid chunk type");
|
nuclear@26
|
2338 }
|
nuclear@26
|
2339 }
|
nuclear@26
|
2340
|
nuclear@26
|
2341 /* Combines the row recently read in with the existing pixels in the
|
nuclear@26
|
2342 row. This routine takes care of alpha and transparency if requested.
|
nuclear@26
|
2343 This routine also handles the two methods of progressive display
|
nuclear@26
|
2344 of interlaced images, depending on the mask value.
|
nuclear@26
|
2345 The mask value describes which pixels are to be combined with
|
nuclear@26
|
2346 the row. The pattern always repeats every 8 pixels, so just 8
|
nuclear@26
|
2347 bits are needed. A one indicates the pixel is to be combined,
|
nuclear@26
|
2348 a zero indicates the pixel is to be skipped. This is in addition
|
nuclear@26
|
2349 to any alpha or transparency value associated with the pixel. If
|
nuclear@26
|
2350 you want all pixels to be combined, pass 0xff (255) in mask. */
|
nuclear@26
|
2351
|
nuclear@26
|
2352 void /* PRIVATE */
|
nuclear@26
|
2353 png_combine_row(png_structp png_ptr, png_bytep row, int mask)
|
nuclear@26
|
2354 {
|
nuclear@26
|
2355 png_debug(1, "in png_combine_row\n");
|
nuclear@26
|
2356 if (mask == 0xff)
|
nuclear@26
|
2357 {
|
nuclear@26
|
2358 png_memcpy(row, png_ptr->row_buf + 1,
|
nuclear@26
|
2359 PNG_ROWBYTES(png_ptr->row_info.pixel_depth, png_ptr->width));
|
nuclear@26
|
2360 }
|
nuclear@26
|
2361 else
|
nuclear@26
|
2362 {
|
nuclear@26
|
2363 switch (png_ptr->row_info.pixel_depth)
|
nuclear@26
|
2364 {
|
nuclear@26
|
2365 case 1:
|
nuclear@26
|
2366 {
|
nuclear@26
|
2367 png_bytep sp = png_ptr->row_buf + 1;
|
nuclear@26
|
2368 png_bytep dp = row;
|
nuclear@26
|
2369 int s_inc, s_start, s_end;
|
nuclear@26
|
2370 int m = 0x80;
|
nuclear@26
|
2371 int shift;
|
nuclear@26
|
2372 png_uint_32 i;
|
nuclear@26
|
2373 png_uint_32 row_width = png_ptr->width;
|
nuclear@26
|
2374
|
nuclear@26
|
2375 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
|
nuclear@26
|
2376 if (png_ptr->transformations & PNG_PACKSWAP)
|
nuclear@26
|
2377 {
|
nuclear@26
|
2378 s_start = 0;
|
nuclear@26
|
2379 s_end = 7;
|
nuclear@26
|
2380 s_inc = 1;
|
nuclear@26
|
2381 }
|
nuclear@26
|
2382 else
|
nuclear@26
|
2383 #endif
|
nuclear@26
|
2384 {
|
nuclear@26
|
2385 s_start = 7;
|
nuclear@26
|
2386 s_end = 0;
|
nuclear@26
|
2387 s_inc = -1;
|
nuclear@26
|
2388 }
|
nuclear@26
|
2389
|
nuclear@26
|
2390 shift = s_start;
|
nuclear@26
|
2391
|
nuclear@26
|
2392 for (i = 0; i < row_width; i++)
|
nuclear@26
|
2393 {
|
nuclear@26
|
2394 if (m & mask)
|
nuclear@26
|
2395 {
|
nuclear@26
|
2396 int value;
|
nuclear@26
|
2397
|
nuclear@26
|
2398 value = (*sp >> shift) & 0x01;
|
nuclear@26
|
2399 *dp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff);
|
nuclear@26
|
2400 *dp |= (png_byte)(value << shift);
|
nuclear@26
|
2401 }
|
nuclear@26
|
2402
|
nuclear@26
|
2403 if (shift == s_end)
|
nuclear@26
|
2404 {
|
nuclear@26
|
2405 shift = s_start;
|
nuclear@26
|
2406 sp++;
|
nuclear@26
|
2407 dp++;
|
nuclear@26
|
2408 }
|
nuclear@26
|
2409 else
|
nuclear@26
|
2410 shift += s_inc;
|
nuclear@26
|
2411
|
nuclear@26
|
2412 if (m == 1)
|
nuclear@26
|
2413 m = 0x80;
|
nuclear@26
|
2414 else
|
nuclear@26
|
2415 m >>= 1;
|
nuclear@26
|
2416 }
|
nuclear@26
|
2417 break;
|
nuclear@26
|
2418 }
|
nuclear@26
|
2419 case 2:
|
nuclear@26
|
2420 {
|
nuclear@26
|
2421 png_bytep sp = png_ptr->row_buf + 1;
|
nuclear@26
|
2422 png_bytep dp = row;
|
nuclear@26
|
2423 int s_start, s_end, s_inc;
|
nuclear@26
|
2424 int m = 0x80;
|
nuclear@26
|
2425 int shift;
|
nuclear@26
|
2426 png_uint_32 i;
|
nuclear@26
|
2427 png_uint_32 row_width = png_ptr->width;
|
nuclear@26
|
2428 int value;
|
nuclear@26
|
2429
|
nuclear@26
|
2430 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
|
nuclear@26
|
2431 if (png_ptr->transformations & PNG_PACKSWAP)
|
nuclear@26
|
2432 {
|
nuclear@26
|
2433 s_start = 0;
|
nuclear@26
|
2434 s_end = 6;
|
nuclear@26
|
2435 s_inc = 2;
|
nuclear@26
|
2436 }
|
nuclear@26
|
2437 else
|
nuclear@26
|
2438 #endif
|
nuclear@26
|
2439 {
|
nuclear@26
|
2440 s_start = 6;
|
nuclear@26
|
2441 s_end = 0;
|
nuclear@26
|
2442 s_inc = -2;
|
nuclear@26
|
2443 }
|
nuclear@26
|
2444
|
nuclear@26
|
2445 shift = s_start;
|
nuclear@26
|
2446
|
nuclear@26
|
2447 for (i = 0; i < row_width; i++)
|
nuclear@26
|
2448 {
|
nuclear@26
|
2449 if (m & mask)
|
nuclear@26
|
2450 {
|
nuclear@26
|
2451 value = (*sp >> shift) & 0x03;
|
nuclear@26
|
2452 *dp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
|
nuclear@26
|
2453 *dp |= (png_byte)(value << shift);
|
nuclear@26
|
2454 }
|
nuclear@26
|
2455
|
nuclear@26
|
2456 if (shift == s_end)
|
nuclear@26
|
2457 {
|
nuclear@26
|
2458 shift = s_start;
|
nuclear@26
|
2459 sp++;
|
nuclear@26
|
2460 dp++;
|
nuclear@26
|
2461 }
|
nuclear@26
|
2462 else
|
nuclear@26
|
2463 shift += s_inc;
|
nuclear@26
|
2464 if (m == 1)
|
nuclear@26
|
2465 m = 0x80;
|
nuclear@26
|
2466 else
|
nuclear@26
|
2467 m >>= 1;
|
nuclear@26
|
2468 }
|
nuclear@26
|
2469 break;
|
nuclear@26
|
2470 }
|
nuclear@26
|
2471 case 4:
|
nuclear@26
|
2472 {
|
nuclear@26
|
2473 png_bytep sp = png_ptr->row_buf + 1;
|
nuclear@26
|
2474 png_bytep dp = row;
|
nuclear@26
|
2475 int s_start, s_end, s_inc;
|
nuclear@26
|
2476 int m = 0x80;
|
nuclear@26
|
2477 int shift;
|
nuclear@26
|
2478 png_uint_32 i;
|
nuclear@26
|
2479 png_uint_32 row_width = png_ptr->width;
|
nuclear@26
|
2480 int value;
|
nuclear@26
|
2481
|
nuclear@26
|
2482 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
|
nuclear@26
|
2483 if (png_ptr->transformations & PNG_PACKSWAP)
|
nuclear@26
|
2484 {
|
nuclear@26
|
2485 s_start = 0;
|
nuclear@26
|
2486 s_end = 4;
|
nuclear@26
|
2487 s_inc = 4;
|
nuclear@26
|
2488 }
|
nuclear@26
|
2489 else
|
nuclear@26
|
2490 #endif
|
nuclear@26
|
2491 {
|
nuclear@26
|
2492 s_start = 4;
|
nuclear@26
|
2493 s_end = 0;
|
nuclear@26
|
2494 s_inc = -4;
|
nuclear@26
|
2495 }
|
nuclear@26
|
2496 shift = s_start;
|
nuclear@26
|
2497
|
nuclear@26
|
2498 for (i = 0; i < row_width; i++)
|
nuclear@26
|
2499 {
|
nuclear@26
|
2500 if (m & mask)
|
nuclear@26
|
2501 {
|
nuclear@26
|
2502 value = (*sp >> shift) & 0xf;
|
nuclear@26
|
2503 *dp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
|
nuclear@26
|
2504 *dp |= (png_byte)(value << shift);
|
nuclear@26
|
2505 }
|
nuclear@26
|
2506
|
nuclear@26
|
2507 if (shift == s_end)
|
nuclear@26
|
2508 {
|
nuclear@26
|
2509 shift = s_start;
|
nuclear@26
|
2510 sp++;
|
nuclear@26
|
2511 dp++;
|
nuclear@26
|
2512 }
|
nuclear@26
|
2513 else
|
nuclear@26
|
2514 shift += s_inc;
|
nuclear@26
|
2515 if (m == 1)
|
nuclear@26
|
2516 m = 0x80;
|
nuclear@26
|
2517 else
|
nuclear@26
|
2518 m >>= 1;
|
nuclear@26
|
2519 }
|
nuclear@26
|
2520 break;
|
nuclear@26
|
2521 }
|
nuclear@26
|
2522 default:
|
nuclear@26
|
2523 {
|
nuclear@26
|
2524 png_bytep sp = png_ptr->row_buf + 1;
|
nuclear@26
|
2525 png_bytep dp = row;
|
nuclear@26
|
2526 png_size_t pixel_bytes = (png_ptr->row_info.pixel_depth >> 3);
|
nuclear@26
|
2527 png_uint_32 i;
|
nuclear@26
|
2528 png_uint_32 row_width = png_ptr->width;
|
nuclear@26
|
2529 png_byte m = 0x80;
|
nuclear@26
|
2530
|
nuclear@26
|
2531
|
nuclear@26
|
2532 for (i = 0; i < row_width; i++)
|
nuclear@26
|
2533 {
|
nuclear@26
|
2534 if (m & mask)
|
nuclear@26
|
2535 {
|
nuclear@26
|
2536 png_memcpy(dp, sp, pixel_bytes);
|
nuclear@26
|
2537 }
|
nuclear@26
|
2538
|
nuclear@26
|
2539 sp += pixel_bytes;
|
nuclear@26
|
2540 dp += pixel_bytes;
|
nuclear@26
|
2541
|
nuclear@26
|
2542 if (m == 1)
|
nuclear@26
|
2543 m = 0x80;
|
nuclear@26
|
2544 else
|
nuclear@26
|
2545 m >>= 1;
|
nuclear@26
|
2546 }
|
nuclear@26
|
2547 break;
|
nuclear@26
|
2548 }
|
nuclear@26
|
2549 }
|
nuclear@26
|
2550 }
|
nuclear@26
|
2551 }
|
nuclear@26
|
2552
|
nuclear@26
|
2553 #ifdef PNG_READ_INTERLACING_SUPPORTED
|
nuclear@26
|
2554 /* OLD pre-1.0.9 interface:
|
nuclear@26
|
2555 void png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
|
nuclear@26
|
2556 png_uint_32 transformations)
|
nuclear@26
|
2557 */
|
nuclear@26
|
2558 void /* PRIVATE */
|
nuclear@26
|
2559 png_do_read_interlace(png_structp png_ptr)
|
nuclear@26
|
2560 {
|
nuclear@26
|
2561 png_row_infop row_info = &(png_ptr->row_info);
|
nuclear@26
|
2562 png_bytep row = png_ptr->row_buf + 1;
|
nuclear@26
|
2563 int pass = png_ptr->pass;
|
nuclear@26
|
2564 png_uint_32 transformations = png_ptr->transformations;
|
nuclear@26
|
2565 #ifdef PNG_USE_LOCAL_ARRAYS
|
nuclear@26
|
2566 /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
|
nuclear@26
|
2567 /* offset to next interlace block */
|
nuclear@26
|
2568 PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
|
nuclear@26
|
2569 #endif
|
nuclear@26
|
2570
|
nuclear@26
|
2571 png_debug(1, "in png_do_read_interlace\n");
|
nuclear@26
|
2572 if (row != NULL && row_info != NULL)
|
nuclear@26
|
2573 {
|
nuclear@26
|
2574 png_uint_32 final_width;
|
nuclear@26
|
2575
|
nuclear@26
|
2576 final_width = row_info->width * png_pass_inc[pass];
|
nuclear@26
|
2577
|
nuclear@26
|
2578 switch (row_info->pixel_depth)
|
nuclear@26
|
2579 {
|
nuclear@26
|
2580 case 1:
|
nuclear@26
|
2581 {
|
nuclear@26
|
2582 png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 3);
|
nuclear@26
|
2583 png_bytep dp = row + (png_size_t)((final_width - 1) >> 3);
|
nuclear@26
|
2584 int sshift, dshift;
|
nuclear@26
|
2585 int s_start, s_end, s_inc;
|
nuclear@26
|
2586 int jstop = png_pass_inc[pass];
|
nuclear@26
|
2587 png_byte v;
|
nuclear@26
|
2588 png_uint_32 i;
|
nuclear@26
|
2589 int j;
|
nuclear@26
|
2590
|
nuclear@26
|
2591 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
|
nuclear@26
|
2592 if (transformations & PNG_PACKSWAP)
|
nuclear@26
|
2593 {
|
nuclear@26
|
2594 sshift = (int)((row_info->width + 7) & 0x07);
|
nuclear@26
|
2595 dshift = (int)((final_width + 7) & 0x07);
|
nuclear@26
|
2596 s_start = 7;
|
nuclear@26
|
2597 s_end = 0;
|
nuclear@26
|
2598 s_inc = -1;
|
nuclear@26
|
2599 }
|
nuclear@26
|
2600 else
|
nuclear@26
|
2601 #endif
|
nuclear@26
|
2602 {
|
nuclear@26
|
2603 sshift = 7 - (int)((row_info->width + 7) & 0x07);
|
nuclear@26
|
2604 dshift = 7 - (int)((final_width + 7) & 0x07);
|
nuclear@26
|
2605 s_start = 0;
|
nuclear@26
|
2606 s_end = 7;
|
nuclear@26
|
2607 s_inc = 1;
|
nuclear@26
|
2608 }
|
nuclear@26
|
2609
|
nuclear@26
|
2610 for (i = 0; i < row_info->width; i++)
|
nuclear@26
|
2611 {
|
nuclear@26
|
2612 v = (png_byte)((*sp >> sshift) & 0x01);
|
nuclear@26
|
2613 for (j = 0; j < jstop; j++)
|
nuclear@26
|
2614 {
|
nuclear@26
|
2615 *dp &= (png_byte)((0x7f7f >> (7 - dshift)) & 0xff);
|
nuclear@26
|
2616 *dp |= (png_byte)(v << dshift);
|
nuclear@26
|
2617 if (dshift == s_end)
|
nuclear@26
|
2618 {
|
nuclear@26
|
2619 dshift = s_start;
|
nuclear@26
|
2620 dp--;
|
nuclear@26
|
2621 }
|
nuclear@26
|
2622 else
|
nuclear@26
|
2623 dshift += s_inc;
|
nuclear@26
|
2624 }
|
nuclear@26
|
2625 if (sshift == s_end)
|
nuclear@26
|
2626 {
|
nuclear@26
|
2627 sshift = s_start;
|
nuclear@26
|
2628 sp--;
|
nuclear@26
|
2629 }
|
nuclear@26
|
2630 else
|
nuclear@26
|
2631 sshift += s_inc;
|
nuclear@26
|
2632 }
|
nuclear@26
|
2633 break;
|
nuclear@26
|
2634 }
|
nuclear@26
|
2635 case 2:
|
nuclear@26
|
2636 {
|
nuclear@26
|
2637 png_bytep sp = row + (png_uint_32)((row_info->width - 1) >> 2);
|
nuclear@26
|
2638 png_bytep dp = row + (png_uint_32)((final_width - 1) >> 2);
|
nuclear@26
|
2639 int sshift, dshift;
|
nuclear@26
|
2640 int s_start, s_end, s_inc;
|
nuclear@26
|
2641 int jstop = png_pass_inc[pass];
|
nuclear@26
|
2642 png_uint_32 i;
|
nuclear@26
|
2643
|
nuclear@26
|
2644 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
|
nuclear@26
|
2645 if (transformations & PNG_PACKSWAP)
|
nuclear@26
|
2646 {
|
nuclear@26
|
2647 sshift = (int)(((row_info->width + 3) & 0x03) << 1);
|
nuclear@26
|
2648 dshift = (int)(((final_width + 3) & 0x03) << 1);
|
nuclear@26
|
2649 s_start = 6;
|
nuclear@26
|
2650 s_end = 0;
|
nuclear@26
|
2651 s_inc = -2;
|
nuclear@26
|
2652 }
|
nuclear@26
|
2653 else
|
nuclear@26
|
2654 #endif
|
nuclear@26
|
2655 {
|
nuclear@26
|
2656 sshift = (int)((3 - ((row_info->width + 3) & 0x03)) << 1);
|
nuclear@26
|
2657 dshift = (int)((3 - ((final_width + 3) & 0x03)) << 1);
|
nuclear@26
|
2658 s_start = 0;
|
nuclear@26
|
2659 s_end = 6;
|
nuclear@26
|
2660 s_inc = 2;
|
nuclear@26
|
2661 }
|
nuclear@26
|
2662
|
nuclear@26
|
2663 for (i = 0; i < row_info->width; i++)
|
nuclear@26
|
2664 {
|
nuclear@26
|
2665 png_byte v;
|
nuclear@26
|
2666 int j;
|
nuclear@26
|
2667
|
nuclear@26
|
2668 v = (png_byte)((*sp >> sshift) & 0x03);
|
nuclear@26
|
2669 for (j = 0; j < jstop; j++)
|
nuclear@26
|
2670 {
|
nuclear@26
|
2671 *dp &= (png_byte)((0x3f3f >> (6 - dshift)) & 0xff);
|
nuclear@26
|
2672 *dp |= (png_byte)(v << dshift);
|
nuclear@26
|
2673 if (dshift == s_end)
|
nuclear@26
|
2674 {
|
nuclear@26
|
2675 dshift = s_start;
|
nuclear@26
|
2676 dp--;
|
nuclear@26
|
2677 }
|
nuclear@26
|
2678 else
|
nuclear@26
|
2679 dshift += s_inc;
|
nuclear@26
|
2680 }
|
nuclear@26
|
2681 if (sshift == s_end)
|
nuclear@26
|
2682 {
|
nuclear@26
|
2683 sshift = s_start;
|
nuclear@26
|
2684 sp--;
|
nuclear@26
|
2685 }
|
nuclear@26
|
2686 else
|
nuclear@26
|
2687 sshift += s_inc;
|
nuclear@26
|
2688 }
|
nuclear@26
|
2689 break;
|
nuclear@26
|
2690 }
|
nuclear@26
|
2691 case 4:
|
nuclear@26
|
2692 {
|
nuclear@26
|
2693 png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 1);
|
nuclear@26
|
2694 png_bytep dp = row + (png_size_t)((final_width - 1) >> 1);
|
nuclear@26
|
2695 int sshift, dshift;
|
nuclear@26
|
2696 int s_start, s_end, s_inc;
|
nuclear@26
|
2697 png_uint_32 i;
|
nuclear@26
|
2698 int jstop = png_pass_inc[pass];
|
nuclear@26
|
2699
|
nuclear@26
|
2700 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
|
nuclear@26
|
2701 if (transformations & PNG_PACKSWAP)
|
nuclear@26
|
2702 {
|
nuclear@26
|
2703 sshift = (int)(((row_info->width + 1) & 0x01) << 2);
|
nuclear@26
|
2704 dshift = (int)(((final_width + 1) & 0x01) << 2);
|
nuclear@26
|
2705 s_start = 4;
|
nuclear@26
|
2706 s_end = 0;
|
nuclear@26
|
2707 s_inc = -4;
|
nuclear@26
|
2708 }
|
nuclear@26
|
2709 else
|
nuclear@26
|
2710 #endif
|
nuclear@26
|
2711 {
|
nuclear@26
|
2712 sshift = (int)((1 - ((row_info->width + 1) & 0x01)) << 2);
|
nuclear@26
|
2713 dshift = (int)((1 - ((final_width + 1) & 0x01)) << 2);
|
nuclear@26
|
2714 s_start = 0;
|
nuclear@26
|
2715 s_end = 4;
|
nuclear@26
|
2716 s_inc = 4;
|
nuclear@26
|
2717 }
|
nuclear@26
|
2718
|
nuclear@26
|
2719 for (i = 0; i < row_info->width; i++)
|
nuclear@26
|
2720 {
|
nuclear@26
|
2721 png_byte v = (png_byte)((*sp >> sshift) & 0xf);
|
nuclear@26
|
2722 int j;
|
nuclear@26
|
2723
|
nuclear@26
|
2724 for (j = 0; j < jstop; j++)
|
nuclear@26
|
2725 {
|
nuclear@26
|
2726 *dp &= (png_byte)((0xf0f >> (4 - dshift)) & 0xff);
|
nuclear@26
|
2727 *dp |= (png_byte)(v << dshift);
|
nuclear@26
|
2728 if (dshift == s_end)
|
nuclear@26
|
2729 {
|
nuclear@26
|
2730 dshift = s_start;
|
nuclear@26
|
2731 dp--;
|
nuclear@26
|
2732 }
|
nuclear@26
|
2733 else
|
nuclear@26
|
2734 dshift += s_inc;
|
nuclear@26
|
2735 }
|
nuclear@26
|
2736 if (sshift == s_end)
|
nuclear@26
|
2737 {
|
nuclear@26
|
2738 sshift = s_start;
|
nuclear@26
|
2739 sp--;
|
nuclear@26
|
2740 }
|
nuclear@26
|
2741 else
|
nuclear@26
|
2742 sshift += s_inc;
|
nuclear@26
|
2743 }
|
nuclear@26
|
2744 break;
|
nuclear@26
|
2745 }
|
nuclear@26
|
2746 default:
|
nuclear@26
|
2747 {
|
nuclear@26
|
2748 png_size_t pixel_bytes = (row_info->pixel_depth >> 3);
|
nuclear@26
|
2749 png_bytep sp = row + (png_size_t)(row_info->width - 1) * pixel_bytes;
|
nuclear@26
|
2750 png_bytep dp = row + (png_size_t)(final_width - 1) * pixel_bytes;
|
nuclear@26
|
2751
|
nuclear@26
|
2752 int jstop = png_pass_inc[pass];
|
nuclear@26
|
2753 png_uint_32 i;
|
nuclear@26
|
2754
|
nuclear@26
|
2755 for (i = 0; i < row_info->width; i++)
|
nuclear@26
|
2756 {
|
nuclear@26
|
2757 png_byte v[8];
|
nuclear@26
|
2758 int j;
|
nuclear@26
|
2759
|
nuclear@26
|
2760 png_memcpy(v, sp, pixel_bytes);
|
nuclear@26
|
2761 for (j = 0; j < jstop; j++)
|
nuclear@26
|
2762 {
|
nuclear@26
|
2763 png_memcpy(dp, v, pixel_bytes);
|
nuclear@26
|
2764 dp -= pixel_bytes;
|
nuclear@26
|
2765 }
|
nuclear@26
|
2766 sp -= pixel_bytes;
|
nuclear@26
|
2767 }
|
nuclear@26
|
2768 break;
|
nuclear@26
|
2769 }
|
nuclear@26
|
2770 }
|
nuclear@26
|
2771 row_info->width = final_width;
|
nuclear@26
|
2772 row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, final_width);
|
nuclear@26
|
2773 }
|
nuclear@26
|
2774 #if !defined(PNG_READ_PACKSWAP_SUPPORTED)
|
nuclear@26
|
2775 transformations = transformations; /* silence compiler warning */
|
nuclear@26
|
2776 #endif
|
nuclear@26
|
2777 }
|
nuclear@26
|
2778 #endif /* PNG_READ_INTERLACING_SUPPORTED */
|
nuclear@26
|
2779
|
nuclear@26
|
2780 void /* PRIVATE */
|
nuclear@26
|
2781 png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row,
|
nuclear@26
|
2782 png_bytep prev_row, int filter)
|
nuclear@26
|
2783 {
|
nuclear@26
|
2784 png_debug(1, "in png_read_filter_row\n");
|
nuclear@26
|
2785 png_debug2(2, "row = %lu, filter = %d\n", png_ptr->row_number, filter);
|
nuclear@26
|
2786 switch (filter)
|
nuclear@26
|
2787 {
|
nuclear@26
|
2788 case PNG_FILTER_VALUE_NONE:
|
nuclear@26
|
2789 break;
|
nuclear@26
|
2790 case PNG_FILTER_VALUE_SUB:
|
nuclear@26
|
2791 {
|
nuclear@26
|
2792 png_uint_32 i;
|
nuclear@26
|
2793 png_uint_32 istop = row_info->rowbytes;
|
nuclear@26
|
2794 png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3;
|
nuclear@26
|
2795 png_bytep rp = row + bpp;
|
nuclear@26
|
2796 png_bytep lp = row;
|
nuclear@26
|
2797
|
nuclear@26
|
2798 for (i = bpp; i < istop; i++)
|
nuclear@26
|
2799 {
|
nuclear@26
|
2800 *rp = (png_byte)(((int)(*rp) + (int)(*lp++)) & 0xff);
|
nuclear@26
|
2801 rp++;
|
nuclear@26
|
2802 }
|
nuclear@26
|
2803 break;
|
nuclear@26
|
2804 }
|
nuclear@26
|
2805 case PNG_FILTER_VALUE_UP:
|
nuclear@26
|
2806 {
|
nuclear@26
|
2807 png_uint_32 i;
|
nuclear@26
|
2808 png_uint_32 istop = row_info->rowbytes;
|
nuclear@26
|
2809 png_bytep rp = row;
|
nuclear@26
|
2810 png_bytep pp = prev_row;
|
nuclear@26
|
2811
|
nuclear@26
|
2812 for (i = 0; i < istop; i++)
|
nuclear@26
|
2813 {
|
nuclear@26
|
2814 *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
|
nuclear@26
|
2815 rp++;
|
nuclear@26
|
2816 }
|
nuclear@26
|
2817 break;
|
nuclear@26
|
2818 }
|
nuclear@26
|
2819 case PNG_FILTER_VALUE_AVG:
|
nuclear@26
|
2820 {
|
nuclear@26
|
2821 png_uint_32 i;
|
nuclear@26
|
2822 png_bytep rp = row;
|
nuclear@26
|
2823 png_bytep pp = prev_row;
|
nuclear@26
|
2824 png_bytep lp = row;
|
nuclear@26
|
2825 png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3;
|
nuclear@26
|
2826 png_uint_32 istop = row_info->rowbytes - bpp;
|
nuclear@26
|
2827
|
nuclear@26
|
2828 for (i = 0; i < bpp; i++)
|
nuclear@26
|
2829 {
|
nuclear@26
|
2830 *rp = (png_byte)(((int)(*rp) +
|
nuclear@26
|
2831 ((int)(*pp++) / 2 )) & 0xff);
|
nuclear@26
|
2832 rp++;
|
nuclear@26
|
2833 }
|
nuclear@26
|
2834
|
nuclear@26
|
2835 for (i = 0; i < istop; i++)
|
nuclear@26
|
2836 {
|
nuclear@26
|
2837 *rp = (png_byte)(((int)(*rp) +
|
nuclear@26
|
2838 (int)(*pp++ + *lp++) / 2 ) & 0xff);
|
nuclear@26
|
2839 rp++;
|
nuclear@26
|
2840 }
|
nuclear@26
|
2841 break;
|
nuclear@26
|
2842 }
|
nuclear@26
|
2843 case PNG_FILTER_VALUE_PAETH:
|
nuclear@26
|
2844 {
|
nuclear@26
|
2845 png_uint_32 i;
|
nuclear@26
|
2846 png_bytep rp = row;
|
nuclear@26
|
2847 png_bytep pp = prev_row;
|
nuclear@26
|
2848 png_bytep lp = row;
|
nuclear@26
|
2849 png_bytep cp = prev_row;
|
nuclear@26
|
2850 png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3;
|
nuclear@26
|
2851 png_uint_32 istop=row_info->rowbytes - bpp;
|
nuclear@26
|
2852
|
nuclear@26
|
2853 for (i = 0; i < bpp; i++)
|
nuclear@26
|
2854 {
|
nuclear@26
|
2855 *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
|
nuclear@26
|
2856 rp++;
|
nuclear@26
|
2857 }
|
nuclear@26
|
2858
|
nuclear@26
|
2859 for (i = 0; i < istop; i++) /* use leftover rp,pp */
|
nuclear@26
|
2860 {
|
nuclear@26
|
2861 int a, b, c, pa, pb, pc, p;
|
nuclear@26
|
2862
|
nuclear@26
|
2863 a = *lp++;
|
nuclear@26
|
2864 b = *pp++;
|
nuclear@26
|
2865 c = *cp++;
|
nuclear@26
|
2866
|
nuclear@26
|
2867 p = b - c;
|
nuclear@26
|
2868 pc = a - c;
|
nuclear@26
|
2869
|
nuclear@26
|
2870 #ifdef PNG_USE_ABS
|
nuclear@26
|
2871 pa = abs(p);
|
nuclear@26
|
2872 pb = abs(pc);
|
nuclear@26
|
2873 pc = abs(p + pc);
|
nuclear@26
|
2874 #else
|
nuclear@26
|
2875 pa = p < 0 ? -p : p;
|
nuclear@26
|
2876 pb = pc < 0 ? -pc : pc;
|
nuclear@26
|
2877 pc = (p + pc) < 0 ? -(p + pc) : p + pc;
|
nuclear@26
|
2878 #endif
|
nuclear@26
|
2879
|
nuclear@26
|
2880 /*
|
nuclear@26
|
2881 if (pa <= pb && pa <= pc)
|
nuclear@26
|
2882 p = a;
|
nuclear@26
|
2883 else if (pb <= pc)
|
nuclear@26
|
2884 p = b;
|
nuclear@26
|
2885 else
|
nuclear@26
|
2886 p = c;
|
nuclear@26
|
2887 */
|
nuclear@26
|
2888
|
nuclear@26
|
2889 p = (pa <= pb && pa <= pc) ? a : (pb <= pc) ? b : c;
|
nuclear@26
|
2890
|
nuclear@26
|
2891 *rp = (png_byte)(((int)(*rp) + p) & 0xff);
|
nuclear@26
|
2892 rp++;
|
nuclear@26
|
2893 }
|
nuclear@26
|
2894 break;
|
nuclear@26
|
2895 }
|
nuclear@26
|
2896 default:
|
nuclear@26
|
2897 png_warning(png_ptr, "Ignoring bad adaptive filter type");
|
nuclear@26
|
2898 *row = 0;
|
nuclear@26
|
2899 break;
|
nuclear@26
|
2900 }
|
nuclear@26
|
2901 }
|
nuclear@26
|
2902
|
nuclear@26
|
2903 void /* PRIVATE */
|
nuclear@26
|
2904 png_read_finish_row(png_structp png_ptr)
|
nuclear@26
|
2905 {
|
nuclear@26
|
2906 #ifdef PNG_USE_LOCAL_ARRAYS
|
nuclear@26
|
2907 #ifdef PNG_READ_INTERLACING_SUPPORTED
|
nuclear@26
|
2908 /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
|
nuclear@26
|
2909
|
nuclear@26
|
2910 /* start of interlace block */
|
nuclear@26
|
2911 PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
|
nuclear@26
|
2912
|
nuclear@26
|
2913 /* offset to next interlace block */
|
nuclear@26
|
2914 PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
|
nuclear@26
|
2915
|
nuclear@26
|
2916 /* start of interlace block in the y direction */
|
nuclear@26
|
2917 PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
|
nuclear@26
|
2918
|
nuclear@26
|
2919 /* offset to next interlace block in the y direction */
|
nuclear@26
|
2920 PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
|
nuclear@26
|
2921 #endif /* PNG_READ_INTERLACING_SUPPORTED */
|
nuclear@26
|
2922 #endif
|
nuclear@26
|
2923
|
nuclear@26
|
2924 png_debug(1, "in png_read_finish_row\n");
|
nuclear@26
|
2925 png_ptr->row_number++;
|
nuclear@26
|
2926 if (png_ptr->row_number < png_ptr->num_rows)
|
nuclear@26
|
2927 return;
|
nuclear@26
|
2928
|
nuclear@26
|
2929 #ifdef PNG_READ_INTERLACING_SUPPORTED
|
nuclear@26
|
2930 if (png_ptr->interlaced)
|
nuclear@26
|
2931 {
|
nuclear@26
|
2932 png_ptr->row_number = 0;
|
nuclear@26
|
2933 png_memset_check(png_ptr, png_ptr->prev_row, 0,
|
nuclear@26
|
2934 png_ptr->rowbytes + 1);
|
nuclear@26
|
2935 do
|
nuclear@26
|
2936 {
|
nuclear@26
|
2937 png_ptr->pass++;
|
nuclear@26
|
2938 if (png_ptr->pass >= 7)
|
nuclear@26
|
2939 break;
|
nuclear@26
|
2940 png_ptr->iwidth = (png_ptr->width +
|
nuclear@26
|
2941 png_pass_inc[png_ptr->pass] - 1 -
|
nuclear@26
|
2942 png_pass_start[png_ptr->pass]) /
|
nuclear@26
|
2943 png_pass_inc[png_ptr->pass];
|
nuclear@26
|
2944
|
nuclear@26
|
2945 png_ptr->irowbytes = PNG_ROWBYTES(png_ptr->pixel_depth,
|
nuclear@26
|
2946 png_ptr->iwidth) + 1;
|
nuclear@26
|
2947
|
nuclear@26
|
2948 if (!(png_ptr->transformations & PNG_INTERLACE))
|
nuclear@26
|
2949 {
|
nuclear@26
|
2950 png_ptr->num_rows = (png_ptr->height +
|
nuclear@26
|
2951 png_pass_yinc[png_ptr->pass] - 1 -
|
nuclear@26
|
2952 png_pass_ystart[png_ptr->pass]) /
|
nuclear@26
|
2953 png_pass_yinc[png_ptr->pass];
|
nuclear@26
|
2954 if (!(png_ptr->num_rows))
|
nuclear@26
|
2955 continue;
|
nuclear@26
|
2956 }
|
nuclear@26
|
2957 else /* if (png_ptr->transformations & PNG_INTERLACE) */
|
nuclear@26
|
2958 break;
|
nuclear@26
|
2959 } while (png_ptr->iwidth == 0);
|
nuclear@26
|
2960
|
nuclear@26
|
2961 if (png_ptr->pass < 7)
|
nuclear@26
|
2962 return;
|
nuclear@26
|
2963 }
|
nuclear@26
|
2964 #endif /* PNG_READ_INTERLACING_SUPPORTED */
|
nuclear@26
|
2965
|
nuclear@26
|
2966 if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
|
nuclear@26
|
2967 {
|
nuclear@26
|
2968 #ifdef PNG_USE_LOCAL_ARRAYS
|
nuclear@26
|
2969 PNG_CONST PNG_IDAT;
|
nuclear@26
|
2970 #endif
|
nuclear@26
|
2971 char extra;
|
nuclear@26
|
2972 int ret;
|
nuclear@26
|
2973
|
nuclear@26
|
2974 png_ptr->zstream.next_out = (Byte *)&extra;
|
nuclear@26
|
2975 png_ptr->zstream.avail_out = (uInt)1;
|
nuclear@26
|
2976 for (;;)
|
nuclear@26
|
2977 {
|
nuclear@26
|
2978 if (!(png_ptr->zstream.avail_in))
|
nuclear@26
|
2979 {
|
nuclear@26
|
2980 while (!png_ptr->idat_size)
|
nuclear@26
|
2981 {
|
nuclear@26
|
2982 png_byte chunk_length[4];
|
nuclear@26
|
2983
|
nuclear@26
|
2984 png_crc_finish(png_ptr, 0);
|
nuclear@26
|
2985
|
nuclear@26
|
2986 png_read_data(png_ptr, chunk_length, 4);
|
nuclear@26
|
2987 png_ptr->idat_size = png_get_uint_31(png_ptr, chunk_length);
|
nuclear@26
|
2988 png_reset_crc(png_ptr);
|
nuclear@26
|
2989 png_crc_read(png_ptr, png_ptr->chunk_name, 4);
|
nuclear@26
|
2990 if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
|
nuclear@26
|
2991 png_error(png_ptr, "Not enough image data");
|
nuclear@26
|
2992
|
nuclear@26
|
2993 }
|
nuclear@26
|
2994 png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size;
|
nuclear@26
|
2995 png_ptr->zstream.next_in = png_ptr->zbuf;
|
nuclear@26
|
2996 if (png_ptr->zbuf_size > png_ptr->idat_size)
|
nuclear@26
|
2997 png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size;
|
nuclear@26
|
2998 png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zstream.avail_in);
|
nuclear@26
|
2999 png_ptr->idat_size -= png_ptr->zstream.avail_in;
|
nuclear@26
|
3000 }
|
nuclear@26
|
3001 ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
|
nuclear@26
|
3002 if (ret == Z_STREAM_END)
|
nuclear@26
|
3003 {
|
nuclear@26
|
3004 if (!(png_ptr->zstream.avail_out) || png_ptr->zstream.avail_in ||
|
nuclear@26
|
3005 png_ptr->idat_size)
|
nuclear@26
|
3006 png_warning(png_ptr, "Extra compressed data");
|
nuclear@26
|
3007 png_ptr->mode |= PNG_AFTER_IDAT;
|
nuclear@26
|
3008 png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
|
nuclear@26
|
3009 break;
|
nuclear@26
|
3010 }
|
nuclear@26
|
3011 if (ret != Z_OK)
|
nuclear@26
|
3012 png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :
|
nuclear@26
|
3013 "Decompression Error");
|
nuclear@26
|
3014
|
nuclear@26
|
3015 if (!(png_ptr->zstream.avail_out))
|
nuclear@26
|
3016 {
|
nuclear@26
|
3017 png_warning(png_ptr, "Extra compressed data.");
|
nuclear@26
|
3018 png_ptr->mode |= PNG_AFTER_IDAT;
|
nuclear@26
|
3019 png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
|
nuclear@26
|
3020 break;
|
nuclear@26
|
3021 }
|
nuclear@26
|
3022
|
nuclear@26
|
3023 }
|
nuclear@26
|
3024 png_ptr->zstream.avail_out = 0;
|
nuclear@26
|
3025 }
|
nuclear@26
|
3026
|
nuclear@26
|
3027 if (png_ptr->idat_size || png_ptr->zstream.avail_in)
|
nuclear@26
|
3028 png_warning(png_ptr, "Extra compression data");
|
nuclear@26
|
3029
|
nuclear@26
|
3030 inflateReset(&png_ptr->zstream);
|
nuclear@26
|
3031
|
nuclear@26
|
3032 png_ptr->mode |= PNG_AFTER_IDAT;
|
nuclear@26
|
3033 }
|
nuclear@26
|
3034
|
nuclear@26
|
3035 void /* PRIVATE */
|
nuclear@26
|
3036 png_read_start_row(png_structp png_ptr)
|
nuclear@26
|
3037 {
|
nuclear@26
|
3038 #ifdef PNG_USE_LOCAL_ARRAYS
|
nuclear@26
|
3039 #ifdef PNG_READ_INTERLACING_SUPPORTED
|
nuclear@26
|
3040 /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
|
nuclear@26
|
3041
|
nuclear@26
|
3042 /* start of interlace block */
|
nuclear@26
|
3043 PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
|
nuclear@26
|
3044
|
nuclear@26
|
3045 /* offset to next interlace block */
|
nuclear@26
|
3046 PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
|
nuclear@26
|
3047
|
nuclear@26
|
3048 /* start of interlace block in the y direction */
|
nuclear@26
|
3049 PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
|
nuclear@26
|
3050
|
nuclear@26
|
3051 /* offset to next interlace block in the y direction */
|
nuclear@26
|
3052 PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
|
nuclear@26
|
3053 #endif
|
nuclear@26
|
3054 #endif
|
nuclear@26
|
3055
|
nuclear@26
|
3056 int max_pixel_depth;
|
nuclear@26
|
3057 png_size_t row_bytes;
|
nuclear@26
|
3058
|
nuclear@26
|
3059 png_debug(1, "in png_read_start_row\n");
|
nuclear@26
|
3060 png_ptr->zstream.avail_in = 0;
|
nuclear@26
|
3061 png_init_read_transformations(png_ptr);
|
nuclear@26
|
3062 #ifdef PNG_READ_INTERLACING_SUPPORTED
|
nuclear@26
|
3063 if (png_ptr->interlaced)
|
nuclear@26
|
3064 {
|
nuclear@26
|
3065 if (!(png_ptr->transformations & PNG_INTERLACE))
|
nuclear@26
|
3066 png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 -
|
nuclear@26
|
3067 png_pass_ystart[0]) / png_pass_yinc[0];
|
nuclear@26
|
3068 else
|
nuclear@26
|
3069 png_ptr->num_rows = png_ptr->height;
|
nuclear@26
|
3070
|
nuclear@26
|
3071 png_ptr->iwidth = (png_ptr->width +
|
nuclear@26
|
3072 png_pass_inc[png_ptr->pass] - 1 -
|
nuclear@26
|
3073 png_pass_start[png_ptr->pass]) /
|
nuclear@26
|
3074 png_pass_inc[png_ptr->pass];
|
nuclear@26
|
3075
|
nuclear@26
|
3076 png_ptr->irowbytes =
|
nuclear@26
|
3077 PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->iwidth) + 1;
|
nuclear@26
|
3078 }
|
nuclear@26
|
3079 else
|
nuclear@26
|
3080 #endif /* PNG_READ_INTERLACING_SUPPORTED */
|
nuclear@26
|
3081 {
|
nuclear@26
|
3082 png_ptr->num_rows = png_ptr->height;
|
nuclear@26
|
3083 png_ptr->iwidth = png_ptr->width;
|
nuclear@26
|
3084 png_ptr->irowbytes = png_ptr->rowbytes + 1;
|
nuclear@26
|
3085 }
|
nuclear@26
|
3086 max_pixel_depth = png_ptr->pixel_depth;
|
nuclear@26
|
3087
|
nuclear@26
|
3088 #if defined(PNG_READ_PACK_SUPPORTED)
|
nuclear@26
|
3089 if ((png_ptr->transformations & PNG_PACK) && png_ptr->bit_depth < 8)
|
nuclear@26
|
3090 max_pixel_depth = 8;
|
nuclear@26
|
3091 #endif
|
nuclear@26
|
3092
|
nuclear@26
|
3093 #if defined(PNG_READ_EXPAND_SUPPORTED)
|
nuclear@26
|
3094 if (png_ptr->transformations & PNG_EXPAND)
|
nuclear@26
|
3095 {
|
nuclear@26
|
3096 if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
|
nuclear@26
|
3097 {
|
nuclear@26
|
3098 if (png_ptr->num_trans)
|
nuclear@26
|
3099 max_pixel_depth = 32;
|
nuclear@26
|
3100 else
|
nuclear@26
|
3101 max_pixel_depth = 24;
|
nuclear@26
|
3102 }
|
nuclear@26
|
3103 else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
|
nuclear@26
|
3104 {
|
nuclear@26
|
3105 if (max_pixel_depth < 8)
|
nuclear@26
|
3106 max_pixel_depth = 8;
|
nuclear@26
|
3107 if (png_ptr->num_trans)
|
nuclear@26
|
3108 max_pixel_depth *= 2;
|
nuclear@26
|
3109 }
|
nuclear@26
|
3110 else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
|
nuclear@26
|
3111 {
|
nuclear@26
|
3112 if (png_ptr->num_trans)
|
nuclear@26
|
3113 {
|
nuclear@26
|
3114 max_pixel_depth *= 4;
|
nuclear@26
|
3115 max_pixel_depth /= 3;
|
nuclear@26
|
3116 }
|
nuclear@26
|
3117 }
|
nuclear@26
|
3118 }
|
nuclear@26
|
3119 #endif
|
nuclear@26
|
3120
|
nuclear@26
|
3121 #if defined(PNG_READ_FILLER_SUPPORTED)
|
nuclear@26
|
3122 if (png_ptr->transformations & (PNG_FILLER))
|
nuclear@26
|
3123 {
|
nuclear@26
|
3124 if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
|
nuclear@26
|
3125 max_pixel_depth = 32;
|
nuclear@26
|
3126 else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
|
nuclear@26
|
3127 {
|
nuclear@26
|
3128 if (max_pixel_depth <= 8)
|
nuclear@26
|
3129 max_pixel_depth = 16;
|
nuclear@26
|
3130 else
|
nuclear@26
|
3131 max_pixel_depth = 32;
|
nuclear@26
|
3132 }
|
nuclear@26
|
3133 else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
|
nuclear@26
|
3134 {
|
nuclear@26
|
3135 if (max_pixel_depth <= 32)
|
nuclear@26
|
3136 max_pixel_depth = 32;
|
nuclear@26
|
3137 else
|
nuclear@26
|
3138 max_pixel_depth = 64;
|
nuclear@26
|
3139 }
|
nuclear@26
|
3140 }
|
nuclear@26
|
3141 #endif
|
nuclear@26
|
3142
|
nuclear@26
|
3143 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
|
nuclear@26
|
3144 if (png_ptr->transformations & PNG_GRAY_TO_RGB)
|
nuclear@26
|
3145 {
|
nuclear@26
|
3146 if (
|
nuclear@26
|
3147 #if defined(PNG_READ_EXPAND_SUPPORTED)
|
nuclear@26
|
3148 (png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND)) ||
|
nuclear@26
|
3149 #endif
|
nuclear@26
|
3150 #if defined(PNG_READ_FILLER_SUPPORTED)
|
nuclear@26
|
3151 (png_ptr->transformations & (PNG_FILLER)) ||
|
nuclear@26
|
3152 #endif
|
nuclear@26
|
3153 png_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
|
nuclear@26
|
3154 {
|
nuclear@26
|
3155 if (max_pixel_depth <= 16)
|
nuclear@26
|
3156 max_pixel_depth = 32;
|
nuclear@26
|
3157 else
|
nuclear@26
|
3158 max_pixel_depth = 64;
|
nuclear@26
|
3159 }
|
nuclear@26
|
3160 else
|
nuclear@26
|
3161 {
|
nuclear@26
|
3162 if (max_pixel_depth <= 8)
|
nuclear@26
|
3163 {
|
nuclear@26
|
3164 if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
|
nuclear@26
|
3165 max_pixel_depth = 32;
|
nuclear@26
|
3166 else
|
nuclear@26
|
3167 max_pixel_depth = 24;
|
nuclear@26
|
3168 }
|
nuclear@26
|
3169 else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
|
nuclear@26
|
3170 max_pixel_depth = 64;
|
nuclear@26
|
3171 else
|
nuclear@26
|
3172 max_pixel_depth = 48;
|
nuclear@26
|
3173 }
|
nuclear@26
|
3174 }
|
nuclear@26
|
3175 #endif
|
nuclear@26
|
3176
|
nuclear@26
|
3177 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) && \
|
nuclear@26
|
3178 defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
|
nuclear@26
|
3179 if (png_ptr->transformations & PNG_USER_TRANSFORM)
|
nuclear@26
|
3180 {
|
nuclear@26
|
3181 int user_pixel_depth = png_ptr->user_transform_depth*
|
nuclear@26
|
3182 png_ptr->user_transform_channels;
|
nuclear@26
|
3183 if (user_pixel_depth > max_pixel_depth)
|
nuclear@26
|
3184 max_pixel_depth=user_pixel_depth;
|
nuclear@26
|
3185 }
|
nuclear@26
|
3186 #endif
|
nuclear@26
|
3187
|
nuclear@26
|
3188 /* align the width on the next larger 8 pixels. Mainly used
|
nuclear@26
|
3189 for interlacing */
|
nuclear@26
|
3190 row_bytes = ((png_ptr->width + 7) & ~((png_uint_32)7));
|
nuclear@26
|
3191 /* calculate the maximum bytes needed, adding a byte and a pixel
|
nuclear@26
|
3192 for safety's sake */
|
nuclear@26
|
3193 row_bytes = PNG_ROWBYTES(max_pixel_depth, row_bytes) +
|
nuclear@26
|
3194 1 + ((max_pixel_depth + 7) >> 3);
|
nuclear@26
|
3195 #ifdef PNG_MAX_MALLOC_64K
|
nuclear@26
|
3196 if (row_bytes > (png_uint_32)65536L)
|
nuclear@26
|
3197 png_error(png_ptr, "This image requires a row greater than 64KB");
|
nuclear@26
|
3198 #endif
|
nuclear@26
|
3199
|
nuclear@26
|
3200 if (row_bytes + 64 > png_ptr->old_big_row_buf_size)
|
nuclear@26
|
3201 {
|
nuclear@26
|
3202 png_free(png_ptr, png_ptr->big_row_buf);
|
nuclear@26
|
3203 png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, row_bytes+64);
|
nuclear@26
|
3204 png_ptr->row_buf = png_ptr->big_row_buf+32;
|
nuclear@26
|
3205 png_ptr->old_big_row_buf_size = row_bytes+64;
|
nuclear@26
|
3206 }
|
nuclear@26
|
3207
|
nuclear@26
|
3208 #ifdef PNG_MAX_MALLOC_64K
|
nuclear@26
|
3209 if ((png_uint_32)png_ptr->rowbytes + 1 > (png_uint_32)65536L)
|
nuclear@26
|
3210 png_error(png_ptr, "This image requires a row greater than 64KB");
|
nuclear@26
|
3211 #endif
|
nuclear@26
|
3212 if ((png_uint_32)png_ptr->rowbytes > (png_uint_32)(PNG_SIZE_MAX - 1))
|
nuclear@26
|
3213 png_error(png_ptr, "Row has too many bytes to allocate in memory.");
|
nuclear@26
|
3214
|
nuclear@26
|
3215 if (png_ptr->rowbytes+1 > png_ptr->old_prev_row_size)
|
nuclear@26
|
3216 {
|
nuclear@26
|
3217 png_free(png_ptr, png_ptr->prev_row);
|
nuclear@26
|
3218 png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)(
|
nuclear@26
|
3219 png_ptr->rowbytes + 1));
|
nuclear@26
|
3220 png_ptr->old_prev_row_size = png_ptr->rowbytes+1;
|
nuclear@26
|
3221 }
|
nuclear@26
|
3222
|
nuclear@26
|
3223 png_memset_check(png_ptr, png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
|
nuclear@26
|
3224
|
nuclear@26
|
3225 png_debug1(3, "width = %lu,\n", png_ptr->width);
|
nuclear@26
|
3226 png_debug1(3, "height = %lu,\n", png_ptr->height);
|
nuclear@26
|
3227 png_debug1(3, "iwidth = %lu,\n", png_ptr->iwidth);
|
nuclear@26
|
3228 png_debug1(3, "num_rows = %lu\n", png_ptr->num_rows);
|
nuclear@26
|
3229 png_debug1(3, "rowbytes = %lu,\n", png_ptr->rowbytes);
|
nuclear@26
|
3230 png_debug1(3, "irowbytes = %lu,\n", png_ptr->irowbytes);
|
nuclear@26
|
3231
|
nuclear@26
|
3232 png_ptr->flags |= PNG_FLAG_ROW_INIT;
|
nuclear@26
|
3233 }
|
nuclear@26
|
3234 #endif /* PNG_READ_SUPPORTED */
|