summaryrefslogtreecommitdiff
path: root/libavcodec/xpmdec.c (plain)
blob: 9112d4cb5e0b37b7878276322fd9a4d15ce6f649
1/*
2 * XPM image format
3 *
4 * Copyright (c) 2012 Paul B Mahol
5 * Copyright (c) 2017 Paras Chadha
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include "libavutil/parseutils.h"
25#include "libavutil/avstring.h"
26#include "avcodec.h"
27#include "internal.h"
28
29typedef struct XPMContext {
30 uint32_t *pixels;
31 int pixels_size;
32} XPMDecContext;
33
34typedef struct ColorEntry {
35 const char *name; ///< a string representing the name of the color
36 uint32_t rgb_color; ///< RGB values for the color
37} ColorEntry;
38
39static int color_table_compare(const void *lhs, const void *rhs)
40{
41 return av_strcasecmp(lhs, ((const ColorEntry *)rhs)->name);
42}
43
44static const ColorEntry color_table[] = {
45 { "AliceBlue", 0xFFF0F8FF },
46 { "AntiqueWhite", 0xFFFAEBD7 },
47 { "Aqua", 0xFF00FFFF },
48 { "Aquamarine", 0xFF7FFFD4 },
49 { "Azure", 0xFFF0FFFF },
50 { "Beige", 0xFFF5F5DC },
51 { "Bisque", 0xFFFFE4C4 },
52 { "Black", 0xFF000000 },
53 { "BlanchedAlmond", 0xFFFFEBCD },
54 { "Blue", 0xFF0000FF },
55 { "BlueViolet", 0xFF8A2BE2 },
56 { "Brown", 0xFFA52A2A },
57 { "BurlyWood", 0xFFDEB887 },
58 { "CadetBlue", 0xFF5F9EA0 },
59 { "Chartreuse", 0xFF7FFF00 },
60 { "Chocolate", 0xFFD2691E },
61 { "Coral", 0xFFFF7F50 },
62 { "CornflowerBlue", 0xFF6495ED },
63 { "Cornsilk", 0xFFFFF8DC },
64 { "Crimson", 0xFFDC143C },
65 { "Cyan", 0xFF00FFFF },
66 { "DarkBlue", 0xFF00008B },
67 { "DarkCyan", 0xFF008B8B },
68 { "DarkGoldenRod", 0xFFB8860B },
69 { "DarkGray", 0xFFA9A9A9 },
70 { "DarkGreen", 0xFF006400 },
71 { "DarkKhaki", 0xFFBDB76B },
72 { "DarkMagenta", 0xFF8B008B },
73 { "DarkOliveGreen", 0xFF556B2F },
74 { "Darkorange", 0xFFFF8C00 },
75 { "DarkOrchid", 0xFF9932CC },
76 { "DarkRed", 0xFF8B0000 },
77 { "DarkSalmon", 0xFFE9967A },
78 { "DarkSeaGreen", 0xFF8FBC8F },
79 { "DarkSlateBlue", 0xFF483D8B },
80 { "DarkSlateGray", 0xFF2F4F4F },
81 { "DarkTurquoise", 0xFF00CED1 },
82 { "DarkViolet", 0xFF9400D3 },
83 { "DeepPink", 0xFFFF1493 },
84 { "DeepSkyBlue", 0xFF00BFFF },
85 { "DimGray", 0xFF696969 },
86 { "DodgerBlue", 0xFF1E90FF },
87 { "FireBrick", 0xFFB22222 },
88 { "FloralWhite", 0xFFFFFAF0 },
89 { "ForestGreen", 0xFF228B22 },
90 { "Fuchsia", 0xFFFF00FF },
91 { "Gainsboro", 0xFFDCDCDC },
92 { "GhostWhite", 0xFFF8F8FF },
93 { "Gold", 0xFFFFD700 },
94 { "GoldenRod", 0xFFDAA520 },
95 { "Gray", 0xFFBEBEBE },
96 { "Green", 0xFF00FF00 },
97 { "GreenYellow", 0xFFADFF2F },
98 { "HoneyDew", 0xFFF0FFF0 },
99 { "HotPink", 0xFFFF69B4 },
100 { "IndianRed", 0xFFCD5C5C },
101 { "Indigo", 0xFF4B0082 },
102 { "Ivory", 0xFFFFFFF0 },
103 { "Khaki", 0xFFF0E68C },
104 { "Lavender", 0xFFE6E6FA },
105 { "LavenderBlush", 0xFFFFF0F5 },
106 { "LawnGreen", 0xFF7CFC00 },
107 { "LemonChiffon", 0xFFFFFACD },
108 { "LightBlue", 0xFFADD8E6 },
109 { "LightCoral", 0xFFF08080 },
110 { "LightCyan", 0xFFE0FFFF },
111 { "LightGoldenRodYellow", 0xFFFAFAD2 },
112 { "LightGreen", 0xFF90EE90 },
113 { "LightGrey", 0xFFD3D3D3 },
114 { "LightPink", 0xFFFFB6C1 },
115 { "LightSalmon", 0xFFFFA07A },
116 { "LightSeaGreen", 0xFF20B2AA },
117 { "LightSkyBlue", 0xFF87CEFA },
118 { "LightSlateGray", 0xFF778899 },
119 { "LightSteelBlue", 0xFFB0C4DE },
120 { "LightYellow", 0xFFFFFFE0 },
121 { "Lime", 0xFF00FF00 },
122 { "LimeGreen", 0xFF32CD32 },
123 { "Linen", 0xFFFAF0E6 },
124 { "Magenta", 0xFFFF00FF },
125 { "Maroon", 0xFFB03060 },
126 { "MediumAquaMarine", 0xFF66CDAA },
127 { "MediumBlue", 0xFF0000CD },
128 { "MediumOrchid", 0xFFBA55D3 },
129 { "MediumPurple", 0xFF9370D8 },
130 { "MediumSeaGreen", 0xFF3CB371 },
131 { "MediumSlateBlue", 0xFF7B68EE },
132 { "MediumSpringGreen", 0xFF00FA9A },
133 { "MediumTurquoise", 0xFF48D1CC },
134 { "MediumVioletRed", 0xFFC71585 },
135 { "MidnightBlue", 0xFF191970 },
136 { "MintCream", 0xFFF5FFFA },
137 { "MistyRose", 0xFFFFE4E1 },
138 { "Moccasin", 0xFFFFE4B5 },
139 { "NavajoWhite", 0xFFFFDEAD },
140 { "Navy", 0xFF000080 },
141 { "None", 0x00000000 },
142 { "OldLace", 0xFFFDF5E6 },
143 { "Olive", 0xFF808000 },
144 { "OliveDrab", 0xFF6B8E23 },
145 { "Orange", 0xFFFFA500 },
146 { "OrangeRed", 0xFFFF4500 },
147 { "Orchid", 0xFFDA70D6 },
148 { "PaleGoldenRod", 0xFFEEE8AA },
149 { "PaleGreen", 0xFF98FB98 },
150 { "PaleTurquoise", 0xFFAFEEEE },
151 { "PaleVioletRed", 0xFFD87093 },
152 { "PapayaWhip", 0xFFFFEFD5 },
153 { "PeachPuff", 0xFFFFDAB9 },
154 { "Peru", 0xFFCD853F },
155 { "Pink", 0xFFFFC0CB },
156 { "Plum", 0xFFDDA0DD },
157 { "PowderBlue", 0xFFB0E0E6 },
158 { "Purple", 0xFFA020F0 },
159 { "Red", 0xFFFF0000 },
160 { "RosyBrown", 0xFFBC8F8F },
161 { "RoyalBlue", 0xFF4169E1 },
162 { "SaddleBrown", 0xFF8B4513 },
163 { "Salmon", 0xFFFA8072 },
164 { "SandyBrown", 0xFFF4A460 },
165 { "SeaGreen", 0xFF2E8B57 },
166 { "SeaShell", 0xFFFFF5EE },
167 { "Sienna", 0xFFA0522D },
168 { "Silver", 0xFFC0C0C0 },
169 { "SkyBlue", 0xFF87CEEB },
170 { "SlateBlue", 0xFF6A5ACD },
171 { "SlateGray", 0xFF708090 },
172 { "Snow", 0xFFFFFAFA },
173 { "SpringGreen", 0xFF00FF7F },
174 { "SteelBlue", 0xFF4682B4 },
175 { "Tan", 0xFFD2B48C },
176 { "Teal", 0xFF008080 },
177 { "Thistle", 0xFFD8BFD8 },
178 { "Tomato", 0xFFFF6347 },
179 { "Turquoise", 0xFF40E0D0 },
180 { "Violet", 0xFFEE82EE },
181 { "Wheat", 0xFFF5DEB3 },
182 { "White", 0xFFFFFFFF },
183 { "WhiteSmoke", 0xFFF5F5F5 },
184 { "Yellow", 0xFFFFFF00 },
185 { "YellowGreen", 0xFF9ACD32 }
186};
187
188static unsigned hex_char_to_number(uint8_t x)
189{
190 if (x >= 'a' && x <= 'f')
191 x -= 'a' - 10;
192 else if (x >= 'A' && x <= 'F')
193 x -= 'A' - 10;
194 else if (x >= '0' && x <= '9')
195 x -= '0';
196 else
197 x = 0;
198 return x;
199}
200
201/*
202 * Function same as strcspn but ignores characters if they are inside a C style comments
203 */
204static size_t mod_strcspn(const char *string, const char *reject)
205{
206 int i, j;
207
208 for (i = 0; string && string[i]; i++) {
209 if (string[i] == '/' && string[i+1] == '*') {
210 i += 2;
211 while ( string && string[i] && (string[i] != '*' || string[i+1] != '/') )
212 i++;
213 i++;
214 } else if (string[i] == '/' && string[i+1] == '/') {
215 i += 2;
216 while ( string && string[i] && string[i] != '\n' )
217 i++;
218 } else {
219 for (j = 0; reject && reject[j]; j++) {
220 if (string[i] == reject[j])
221 break;
222 }
223 if (reject && reject[j])
224 break;
225 }
226 }
227 return i;
228}
229
230static uint32_t color_string_to_rgba(const char *p, int len)
231{
232 uint32_t ret = 0xFF000000;
233 const ColorEntry *entry;
234 char color_name[100];
235
236 if (*p == '#') {
237 p++;
238 len--;
239 if (len == 3) {
240 ret |= (hex_char_to_number(p[2]) << 4) |
241 (hex_char_to_number(p[1]) << 12) |
242 (hex_char_to_number(p[0]) << 20);
243 } else if (len == 4) {
244 ret = (hex_char_to_number(p[3]) << 4) |
245 (hex_char_to_number(p[2]) << 12) |
246 (hex_char_to_number(p[1]) << 20) |
247 (hex_char_to_number(p[0]) << 28);
248 } else if (len == 6) {
249 ret |= hex_char_to_number(p[5]) |
250 (hex_char_to_number(p[4]) << 4) |
251 (hex_char_to_number(p[3]) << 8) |
252 (hex_char_to_number(p[2]) << 12) |
253 (hex_char_to_number(p[1]) << 16) |
254 (hex_char_to_number(p[0]) << 20);
255 } else if (len == 8) {
256 ret = hex_char_to_number(p[7]) |
257 (hex_char_to_number(p[6]) << 4) |
258 (hex_char_to_number(p[5]) << 8) |
259 (hex_char_to_number(p[4]) << 12) |
260 (hex_char_to_number(p[3]) << 16) |
261 (hex_char_to_number(p[2]) << 20) |
262 (hex_char_to_number(p[1]) << 24) |
263 (hex_char_to_number(p[0]) << 28);
264 }
265 } else {
266 strncpy(color_name, p, len);
267 color_name[len] = '\0';
268
269 entry = bsearch(color_name,
270 color_table,
271 FF_ARRAY_ELEMS(color_table),
272 sizeof(ColorEntry),
273 color_table_compare);
274
275 if (!entry)
276 return ret;
277
278 ret = entry->rgb_color;
279 }
280 return ret;
281}
282
283static int ascii2index(const uint8_t *cpixel, int cpp)
284{
285 const uint8_t *p = cpixel;
286 int n = 0, m = 1, i;
287
288 for (i = 0; i < cpp; i++) {
289 if (*p < ' ' || *p > '~')
290 return AVERROR_INVALIDDATA;
291 n += (*p++ - ' ') * m;
292 m *= 95;
293 }
294 return n;
295}
296
297static int xpm_decode_frame(AVCodecContext *avctx, void *data,
298 int *got_frame, AVPacket *avpkt)
299{
300 XPMDecContext *x = avctx->priv_data;
301 AVFrame *p=data;
302 const uint8_t *end, *ptr = avpkt->data;
303 int ncolors, cpp, ret, i, j;
304 int64_t size;
305 uint32_t *dst;
306
307 avctx->pix_fmt = AV_PIX_FMT_BGRA;
308
309 end = avpkt->data + avpkt->size;
310 while (memcmp(ptr, "/* XPM */", 9) && ptr < end - 9)
311 ptr++;
312
313 if (ptr >= end) {
314 av_log(avctx, AV_LOG_ERROR, "missing signature\n");
315 return AVERROR_INVALIDDATA;
316 }
317
318 ptr += mod_strcspn(ptr, "\"");
319 if (sscanf(ptr, "\"%u %u %u %u\",",
320 &avctx->width, &avctx->height, &ncolors, &cpp) != 4) {
321 av_log(avctx, AV_LOG_ERROR, "missing image parameters\n");
322 return AVERROR_INVALIDDATA;
323 }
324
325 if ((ret = ff_set_dimensions(avctx, avctx->width, avctx->height)) < 0)
326 return ret;
327
328 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
329 return ret;
330
331 if (cpp <= 0 || cpp >= 5) {
332 av_log(avctx, AV_LOG_ERROR, "unsupported/invalid number of chars per pixel: %d\n", cpp);
333 return AVERROR_INVALIDDATA;
334 }
335
336 size = 1;
337 for (i = 0; i < cpp; i++)
338 size *= 94;
339
340 if (ncolors <= 0 || ncolors > size) {
341 av_log(avctx, AV_LOG_ERROR, "invalid number of colors: %d\n", ncolors);
342 return AVERROR_INVALIDDATA;
343 }
344
345 size *= 4;
346
347 av_fast_padded_malloc(&x->pixels, &x->pixels_size, size);
348 if (!x->pixels)
349 return AVERROR(ENOMEM);
350
351 ptr += mod_strcspn(ptr, ",") + 1;
352 for (i = 0; i < ncolors; i++) {
353 const uint8_t *index;
354 int len;
355
356 ptr += mod_strcspn(ptr, "\"") + 1;
357 if (ptr + cpp > end)
358 return AVERROR_INVALIDDATA;
359 index = ptr;
360 ptr += cpp;
361
362 ptr = strstr(ptr, "c ");
363 if (ptr) {
364 ptr += 2;
365 } else {
366 return AVERROR_INVALIDDATA;
367 }
368
369 len = strcspn(ptr, "\" ");
370
371 if ((ret = ascii2index(index, cpp)) < 0)
372 return ret;
373
374 x->pixels[ret] = color_string_to_rgba(ptr, len);
375 ptr += mod_strcspn(ptr, ",") + 1;
376 }
377
378 for (i = 0; i < avctx->height; i++) {
379 dst = (uint32_t *)(p->data[0] + i * p->linesize[0]);
380 ptr += mod_strcspn(ptr, "\"") + 1;
381
382 for (j = 0; j < avctx->width; j++) {
383 if (ptr + cpp > end)
384 return AVERROR_INVALIDDATA;
385
386 if ((ret = ascii2index(ptr, cpp)) < 0)
387 return ret;
388
389 *dst++ = x->pixels[ret];
390 ptr += cpp;
391 }
392 ptr += mod_strcspn(ptr, ",") + 1;
393 }
394
395 p->key_frame = 1;
396 p->pict_type = AV_PICTURE_TYPE_I;
397
398 *got_frame = 1;
399
400 return avpkt->size;
401}
402
403static av_cold int xpm_decode_close(AVCodecContext *avctx)
404{
405 XPMDecContext *x = avctx->priv_data;
406 av_freep(&x->pixels);
407
408 return 0;
409}
410
411AVCodec ff_xpm_decoder = {
412 .name = "xpm",
413 .type = AVMEDIA_TYPE_VIDEO,
414 .id = AV_CODEC_ID_XPM,
415 .priv_data_size = sizeof(XPMDecContext),
416 .close = xpm_decode_close,
417 .decode = xpm_decode_frame,
418 .capabilities = AV_CODEC_CAP_DR1,
419 .long_name = NULL_IF_CONFIG_SMALL("XPM (X PixMap) image")
420};
421
generated by cgit at 2024-05-17 05:49:04 (GMT)