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ef416fc2 | 1 | /* |
f7deaa1a | 2 | * "$Id: image-gif.c 5508 2006-05-11 11:41:16Z mike $" |
ef416fc2 | 3 | * |
4 | * GIF image routines for the Common UNIX Printing System (CUPS). | |
5 | * | |
f301802f | 6 | * Copyright 1993-2006 by Easy Software Products. |
ef416fc2 | 7 | * |
8 | * These coded instructions, statements, and computer programs are the | |
9 | * property of Easy Software Products and are protected by Federal | |
10 | * copyright law. Distribution and use rights are outlined in the file | |
11 | * "LICENSE.txt" which should have been included with this file. If this | |
12 | * file is missing or damaged please contact Easy Software Products | |
13 | * at: | |
14 | * | |
15 | * Attn: CUPS Licensing Information | |
16 | * Easy Software Products | |
17 | * 44141 Airport View Drive, Suite 204 | |
18 | * Hollywood, Maryland 20636 USA | |
19 | * | |
20 | * Voice: (301) 373-9600 | |
21 | * EMail: cups-info@cups.org | |
22 | * WWW: http://www.cups.org | |
23 | * | |
24 | * This file is subject to the Apple OS-Developed Software exception. | |
25 | * | |
26 | * Contents: | |
27 | * | |
28 | * _cupsImageReadGIF() - Read a GIF image file. | |
29 | * gif_get_block() - Read a GIF data block... | |
30 | * gif_get_code() - Get a LZW code from the file... | |
31 | * gif_read_cmap() - Read the colormap from a GIF file... | |
32 | * gif_read_image() - Read a GIF image stream... | |
33 | * gif_read_lzw() - Read a byte from the LZW stream... | |
34 | */ | |
35 | ||
36 | /* | |
37 | * Include necessary headers... | |
38 | */ | |
39 | ||
40 | #include "image-private.h" | |
41 | ||
42 | ||
43 | /* | |
44 | * GIF definitions... | |
45 | */ | |
46 | ||
47 | #define GIF_INTERLACE 0x40 | |
48 | #define GIF_COLORMAP 0x80 | |
49 | ||
50 | typedef cups_ib_t gif_cmap_t[256][4]; | |
51 | typedef short gif_table_t[4096]; | |
52 | ||
53 | ||
54 | /* | |
55 | * Local globals... | |
56 | */ | |
57 | ||
58 | static int gif_eof = 0; /* Did we hit EOF? */ | |
59 | ||
60 | ||
61 | /* | |
62 | * Local functions... | |
63 | */ | |
64 | ||
65 | static int gif_get_block(FILE *fp, unsigned char *buffer); | |
66 | static int gif_get_code (FILE *fp, int code_size, int first_time); | |
67 | static int gif_read_cmap(FILE *fp, int ncolors, gif_cmap_t cmap, | |
68 | int *gray); | |
69 | static int gif_read_image(FILE *fp, cups_image_t *img, gif_cmap_t cmap, | |
70 | int interlace); | |
71 | static int gif_read_lzw(FILE *fp, int first_time, int input_code_size); | |
72 | ||
73 | ||
74 | /* | |
75 | * '_cupsImageReadGIF()' - Read a GIF image file. | |
76 | */ | |
77 | ||
78 | int /* O - Read status */ | |
79 | _cupsImageReadGIF( | |
80 | cups_image_t *img, /* IO - cupsImage */ | |
81 | FILE *fp, /* I - cupsImage file */ | |
82 | cups_icspace_t primary, /* I - Primary choice for colorspace */ | |
83 | cups_icspace_t secondary, /* I - Secondary choice for colorspace */ | |
84 | int saturation, /* I - Color saturation (%) */ | |
85 | int hue, /* I - Color hue (degrees) */ | |
86 | const cups_ib_t *lut) /* I - Lookup table for gamma/brightness */ | |
87 | { | |
88 | unsigned char buf[1024]; /* Input buffer */ | |
89 | gif_cmap_t cmap; /* Colormap */ | |
90 | int i, /* Looping var */ | |
91 | bpp, /* Bytes per pixel */ | |
92 | gray, /* Grayscale image? */ | |
93 | ncolors, /* Bits per pixel */ | |
94 | transparent; /* Transparent color index */ | |
95 | ||
96 | ||
97 | /* | |
98 | * GIF files are either grayscale or RGB - no CMYK... | |
99 | */ | |
100 | ||
101 | if (primary == CUPS_IMAGE_RGB_CMYK) | |
102 | primary = CUPS_IMAGE_RGB; | |
103 | ||
104 | /* | |
105 | * Read the header; we already know it is a GIF file... | |
106 | */ | |
107 | ||
108 | fread(buf, 13, 1, fp); | |
109 | ||
110 | img->xsize = (buf[7] << 8) | buf[6]; | |
111 | img->ysize = (buf[9] << 8) | buf[8]; | |
112 | ncolors = 2 << (buf[10] & 0x07); | |
113 | gray = primary == CUPS_IMAGE_BLACK || primary == CUPS_IMAGE_WHITE; | |
114 | ||
115 | if (buf[10] & GIF_COLORMAP) | |
116 | if (gif_read_cmap(fp, ncolors, cmap, &gray)) | |
117 | { | |
118 | fclose(fp); | |
119 | return (-1); | |
120 | } | |
121 | ||
122 | transparent = -1; | |
123 | ||
124 | for (;;) | |
125 | { | |
126 | switch (getc(fp)) | |
127 | { | |
128 | case ';' : /* End of image */ | |
129 | fclose(fp); | |
130 | return (-1); /* Early end of file */ | |
131 | ||
132 | case '!' : /* Extension record */ | |
133 | buf[0] = getc(fp); | |
134 | if (buf[0] == 0xf9) /* Graphic Control Extension */ | |
135 | { | |
136 | gif_get_block(fp, buf); | |
137 | if (buf[0] & 1) /* Get transparent color index */ | |
138 | transparent = buf[3]; | |
139 | } | |
140 | ||
141 | while (gif_get_block(fp, buf) != 0); | |
142 | break; | |
143 | ||
144 | case ',' : /* cupsImage data */ | |
145 | fread(buf, 9, 1, fp); | |
146 | ||
147 | if (buf[8] & GIF_COLORMAP) | |
148 | { | |
149 | ncolors = 2 << (buf[8] & 0x07); | |
150 | gray = primary == CUPS_IMAGE_BLACK || primary == CUPS_IMAGE_WHITE; | |
151 | ||
152 | if (gif_read_cmap(fp, ncolors, cmap, &gray)) | |
153 | { | |
154 | fclose(fp); | |
155 | return (-1); | |
156 | } | |
157 | } | |
158 | ||
159 | if (transparent >= 0) | |
160 | { | |
161 | /* | |
162 | * Make transparent color white... | |
163 | */ | |
164 | ||
165 | cmap[transparent][0] = 255; | |
166 | cmap[transparent][1] = 255; | |
167 | cmap[transparent][2] = 255; | |
168 | } | |
169 | ||
170 | if (gray) | |
171 | { | |
172 | switch (secondary) | |
173 | { | |
174 | case CUPS_IMAGE_CMYK : | |
175 | for (i = ncolors - 1; i >= 0; i --) | |
176 | cupsImageWhiteToCMYK(cmap[i], cmap[i], 1); | |
177 | break; | |
178 | case CUPS_IMAGE_CMY : | |
179 | for (i = ncolors - 1; i >= 0; i --) | |
180 | cupsImageWhiteToCMY(cmap[i], cmap[i], 1); | |
181 | break; | |
182 | case CUPS_IMAGE_BLACK : | |
183 | for (i = ncolors - 1; i >= 0; i --) | |
184 | cupsImageWhiteToBlack(cmap[i], cmap[i], 1); | |
185 | break; | |
186 | case CUPS_IMAGE_WHITE : | |
187 | break; | |
188 | case CUPS_IMAGE_RGB : | |
189 | case CUPS_IMAGE_RGB_CMYK : | |
190 | for (i = ncolors - 1; i >= 0; i --) | |
191 | cupsImageWhiteToRGB(cmap[i], cmap[i], 1); | |
192 | break; | |
193 | } | |
194 | ||
195 | img->colorspace = secondary; | |
196 | } | |
197 | else | |
198 | { | |
199 | if (hue != 0 || saturation != 100) | |
200 | for (i = ncolors - 1; i >= 0; i --) | |
201 | cupsImageRGBAdjust(cmap[i], 1, saturation, hue); | |
202 | ||
203 | switch (primary) | |
204 | { | |
205 | case CUPS_IMAGE_CMYK : | |
206 | for (i = ncolors - 1; i >= 0; i --) | |
207 | cupsImageRGBToCMYK(cmap[i], cmap[i], 1); | |
208 | break; | |
209 | case CUPS_IMAGE_CMY : | |
210 | for (i = ncolors - 1; i >= 0; i --) | |
211 | cupsImageRGBToCMY(cmap[i], cmap[i], 1); | |
212 | break; | |
213 | case CUPS_IMAGE_BLACK : | |
214 | for (i = ncolors - 1; i >= 0; i --) | |
215 | cupsImageRGBToBlack(cmap[i], cmap[i], 1); | |
216 | break; | |
217 | case CUPS_IMAGE_WHITE : | |
218 | for (i = ncolors - 1; i >= 0; i --) | |
219 | cupsImageRGBToWhite(cmap[i], cmap[i], 1); | |
220 | break; | |
221 | case CUPS_IMAGE_RGB : | |
222 | case CUPS_IMAGE_RGB_CMYK : | |
f301802f | 223 | for (i = ncolors - 1; i >= 0; i --) |
224 | cupsImageRGBToRGB(cmap[i], cmap[i], 1); | |
ef416fc2 | 225 | break; |
226 | } | |
227 | ||
228 | img->colorspace = primary; | |
229 | } | |
230 | ||
231 | if (lut) | |
232 | { | |
233 | bpp = cupsImageGetDepth(img); | |
234 | ||
235 | for (i = ncolors - 1; i >= 0; i --) | |
236 | cupsImageLut(cmap[i], bpp, lut); | |
237 | } | |
238 | ||
239 | img->xsize = (buf[5] << 8) | buf[4]; | |
240 | img->ysize = (buf[7] << 8) | buf[6]; | |
241 | ||
242 | /* | |
243 | * Check the dimensions of the image; since the dimensions are | |
244 | * a 16-bit integer we just need to check for 0... | |
245 | */ | |
246 | ||
247 | if (img->xsize == 0 || img->ysize == 0) | |
248 | { | |
249 | fprintf(stderr, "ERROR: Bad GIF image dimensions: %dx%d\n", | |
250 | img->xsize, img->ysize); | |
251 | fclose(fp); | |
252 | return (1); | |
253 | } | |
254 | ||
255 | i = gif_read_image(fp, img, cmap, buf[8] & GIF_INTERLACE); | |
256 | fclose(fp); | |
257 | return (i); | |
258 | } | |
259 | } | |
260 | } | |
261 | ||
262 | ||
263 | /* | |
264 | * 'gif_get_block()' - Read a GIF data block... | |
265 | */ | |
266 | ||
267 | static int /* O - Number characters read */ | |
268 | gif_get_block(FILE *fp, /* I - File to read from */ | |
269 | unsigned char *buf) /* I - Input buffer */ | |
270 | { | |
271 | int count; /* Number of character to read */ | |
272 | ||
273 | ||
274 | /* | |
275 | * Read the count byte followed by the data from the file... | |
276 | */ | |
277 | ||
278 | if ((count = getc(fp)) == EOF) | |
279 | { | |
280 | gif_eof = 1; | |
281 | return (-1); | |
282 | } | |
283 | else if (count == 0) | |
284 | gif_eof = 1; | |
285 | else if (fread(buf, 1, count, fp) < count) | |
286 | { | |
287 | gif_eof = 1; | |
288 | return (-1); | |
289 | } | |
290 | else | |
291 | gif_eof = 0; | |
292 | ||
293 | return (count); | |
294 | } | |
295 | ||
296 | ||
297 | /* | |
298 | * 'gif_get_code()' - Get a LZW code from the file... | |
299 | */ | |
300 | ||
301 | static int /* O - LZW code */ | |
302 | gif_get_code(FILE *fp, /* I - File to read from */ | |
303 | int code_size, /* I - Size of code in bits */ | |
304 | int first_time) /* I - 1 = first time, 0 = not first time */ | |
305 | { | |
306 | unsigned i, j, /* Looping vars */ | |
307 | ret; /* Return value */ | |
308 | int count; /* Number of bytes read */ | |
309 | static unsigned char buf[280]; /* Input buffer */ | |
310 | static unsigned curbit, /* Current bit */ | |
311 | lastbit, /* Last bit in buffer */ | |
312 | done, /* Done with this buffer? */ | |
313 | last_byte; /* Last byte in buffer */ | |
314 | static const unsigned char bits[8] = /* Bit masks for codes */ | |
315 | { | |
316 | 0x01, 0x02, 0x04, 0x08, | |
317 | 0x10, 0x20, 0x40, 0x80 | |
318 | }; | |
319 | ||
320 | ||
321 | if (first_time) | |
322 | { | |
323 | /* | |
324 | * Just initialize the input buffer... | |
325 | */ | |
326 | ||
327 | curbit = 0; | |
328 | lastbit = 0; | |
329 | last_byte = 0; | |
330 | done = 0; | |
331 | ||
332 | return (0); | |
333 | } | |
334 | ||
335 | if ((curbit + code_size) >= lastbit) | |
336 | { | |
337 | /* | |
338 | * Don't have enough bits to hold the code... | |
339 | */ | |
340 | ||
341 | if (done) | |
342 | return (-1); /* Sorry, no more... */ | |
343 | ||
344 | /* | |
345 | * Move last two bytes to front of buffer... | |
346 | */ | |
347 | ||
348 | if (last_byte > 1) | |
349 | { | |
350 | buf[0] = buf[last_byte - 2]; | |
351 | buf[1] = buf[last_byte - 1]; | |
352 | last_byte = 2; | |
353 | } | |
354 | else if (last_byte == 1) | |
355 | { | |
356 | buf[0] = buf[last_byte - 1]; | |
357 | last_byte = 1; | |
358 | } | |
359 | ||
360 | /* | |
361 | * Read in another buffer... | |
362 | */ | |
363 | ||
364 | if ((count = gif_get_block (fp, buf + last_byte)) <= 0) | |
365 | { | |
366 | /* | |
367 | * Whoops, no more data! | |
368 | */ | |
369 | ||
370 | done = 1; | |
371 | return (-1); | |
372 | } | |
373 | ||
374 | /* | |
375 | * Update buffer state... | |
376 | */ | |
377 | ||
378 | curbit = (curbit - lastbit) + 8 * last_byte; | |
379 | last_byte += count; | |
380 | lastbit = last_byte * 8; | |
381 | } | |
382 | ||
383 | ret = 0; | |
384 | for (ret = 0, i = curbit + code_size - 1, j = code_size; | |
385 | j > 0; | |
386 | i --, j --) | |
387 | ret = (ret << 1) | ((buf[i / 8] & bits[i & 7]) != 0); | |
388 | ||
389 | curbit += code_size; | |
390 | ||
391 | return ret; | |
392 | } | |
393 | ||
394 | ||
395 | /* | |
396 | * 'gif_read_cmap()' - Read the colormap from a GIF file... | |
397 | */ | |
398 | ||
399 | static int /* O - -1 on error, 0 on success */ | |
400 | gif_read_cmap(FILE *fp, /* I - File to read from */ | |
401 | int ncolors, /* I - Number of colors in file */ | |
402 | gif_cmap_t cmap, /* O - Colormap information */ | |
403 | int *gray) /* IO - Is the image grayscale? */ | |
404 | { | |
405 | int i; /* Looping var */ | |
406 | ||
407 | ||
408 | /* | |
409 | * Read the colormap... | |
410 | */ | |
411 | ||
412 | for (i = 0; i < ncolors; i ++) | |
413 | if (fread(cmap[i], 3, 1, fp) < 1) | |
414 | return (-1); | |
415 | ||
416 | /* | |
417 | * Check to see if the colormap is a grayscale ramp... | |
418 | */ | |
419 | ||
420 | for (i = 0; i < ncolors; i ++) | |
421 | if (cmap[i][0] != cmap[i][1] || cmap[i][1] != cmap[i][2]) | |
422 | break; | |
423 | ||
424 | if (i == ncolors) | |
425 | { | |
426 | *gray = 1; | |
427 | return (0); | |
428 | } | |
429 | ||
430 | /* | |
431 | * If this needs to be a grayscale image, convert the RGB values to | |
432 | * luminance values... | |
433 | */ | |
434 | ||
435 | if (*gray) | |
436 | for (i = 0; i < ncolors; i ++) | |
437 | cmap[i][0] = (cmap[i][0] * 31 + cmap[i][1] * 61 + cmap[i][2] * 8) / 100; | |
438 | ||
439 | return (0); | |
440 | } | |
441 | ||
442 | ||
443 | /* | |
444 | * 'gif_read_image()' - Read a GIF image stream... | |
445 | */ | |
446 | ||
447 | static int /* I - 0 = success, -1 = failure */ | |
448 | gif_read_image(FILE *fp, /* I - Input file */ | |
449 | cups_image_t *img, /* I - cupsImage pointer */ | |
450 | gif_cmap_t cmap, /* I - Colormap */ | |
451 | int interlace) /* I - Non-zero = interlaced image */ | |
452 | { | |
453 | unsigned char code_size; /* Code size */ | |
454 | cups_ib_t *pixels, /* Pixel buffer */ | |
455 | *temp; /* Current pixel */ | |
456 | int xpos, /* Current X position */ | |
457 | ypos, /* Current Y position */ | |
458 | pass; /* Current pass */ | |
459 | int pixel; /* Current pixel */ | |
460 | int bpp; /* Bytes per pixel */ | |
461 | static const int xpasses[4] = /* X interleaving */ | |
462 | { 8, 8, 4, 2 }, | |
463 | ypasses[5] = /* Y interleaving */ | |
464 | { 0, 4, 2, 1, 999999 }; | |
465 | ||
466 | ||
467 | bpp = cupsImageGetDepth(img); | |
468 | pixels = calloc(bpp, img->xsize); | |
469 | xpos = 0; | |
470 | ypos = 0; | |
471 | pass = 0; | |
472 | code_size = getc(fp); | |
473 | ||
474 | if (gif_read_lzw(fp, 1, code_size) < 0) | |
475 | return (-1); | |
476 | ||
477 | temp = pixels; | |
478 | while ((pixel = gif_read_lzw(fp, 0, code_size)) >= 0) | |
479 | { | |
480 | switch (bpp) | |
481 | { | |
482 | case 4 : | |
483 | temp[3] = cmap[pixel][3]; | |
484 | case 3 : | |
485 | temp[2] = cmap[pixel][2]; | |
486 | case 2 : | |
487 | temp[1] = cmap[pixel][1]; | |
488 | default : | |
489 | temp[0] = cmap[pixel][0]; | |
490 | } | |
491 | ||
492 | xpos ++; | |
493 | temp += bpp; | |
494 | if (xpos == img->xsize) | |
495 | { | |
496 | _cupsImagePutRow(img, 0, ypos, img->xsize, pixels); | |
497 | ||
498 | xpos = 0; | |
499 | temp = pixels; | |
500 | ||
501 | if (interlace) | |
502 | { | |
503 | ypos += xpasses[pass]; | |
504 | ||
505 | if (ypos >= img->ysize) | |
506 | { | |
507 | pass ++; | |
508 | ||
509 | ypos = ypasses[pass]; | |
510 | } | |
511 | } | |
512 | else | |
513 | ypos ++; | |
514 | } | |
515 | ||
516 | if (ypos >= img->ysize) | |
517 | break; | |
518 | } | |
519 | ||
520 | free(pixels); | |
521 | ||
522 | return (0); | |
523 | } | |
524 | ||
525 | ||
526 | /* | |
527 | * 'gif_read_lzw()' - Read a byte from the LZW stream... | |
528 | */ | |
529 | ||
530 | static int /* I - Byte from stream */ | |
531 | gif_read_lzw(FILE *fp, /* I - File to read from */ | |
532 | int first_time, /* I - 1 = first time, 0 = not first time */ | |
533 | int input_code_size) /* I - Code size in bits */ | |
534 | { | |
535 | int i, /* Looping var */ | |
536 | code, /* Current code */ | |
537 | incode; /* Input code */ | |
538 | static short fresh = 0, /* 1 = empty buffers */ | |
539 | code_size, /* Current code size */ | |
540 | set_code_size, /* Initial code size set */ | |
541 | max_code, /* Maximum code used */ | |
542 | max_code_size, /* Maximum code size */ | |
543 | firstcode, /* First code read */ | |
544 | oldcode, /* Last code read */ | |
545 | clear_code, /* Clear code for LZW input */ | |
546 | end_code, /* End code for LZW input */ | |
547 | *stack = NULL, /* Output stack */ | |
548 | *sp; /* Current stack pointer */ | |
549 | static gif_table_t *table = NULL; /* String table */ | |
550 | ||
551 | ||
552 | if (first_time) | |
553 | { | |
554 | /* | |
555 | * Setup LZW state... | |
556 | */ | |
557 | ||
558 | set_code_size = input_code_size; | |
559 | code_size = set_code_size + 1; | |
560 | clear_code = 1 << set_code_size; | |
561 | end_code = clear_code + 1; | |
562 | max_code_size = 2 * clear_code; | |
563 | max_code = clear_code + 2; | |
564 | ||
565 | /* | |
566 | * Allocate memory for buffers... | |
567 | */ | |
568 | ||
569 | if (table == NULL) | |
570 | table = calloc(2, sizeof(gif_table_t)); | |
571 | ||
572 | if (table == NULL) | |
573 | return (-1); | |
574 | ||
575 | if (stack == NULL) | |
576 | stack = calloc(8192, sizeof(short)); | |
577 | ||
578 | if (stack == NULL) | |
579 | return (-1); | |
580 | ||
581 | /* | |
582 | * Initialize input buffers... | |
583 | */ | |
584 | ||
585 | gif_get_code(fp, 0, 1); | |
586 | ||
587 | /* | |
588 | * Wipe the decompressor table... | |
589 | */ | |
590 | ||
591 | fresh = 1; | |
592 | ||
593 | for (i = 0; i < clear_code; i ++) | |
594 | { | |
595 | table[0][i] = 0; | |
596 | table[1][i] = i; | |
597 | } | |
598 | ||
599 | for (; i < 4096; i ++) | |
600 | table[0][i] = table[1][0] = 0; | |
601 | ||
602 | sp = stack; | |
603 | ||
604 | return (0); | |
605 | } | |
606 | else if (fresh) | |
607 | { | |
608 | fresh = 0; | |
609 | ||
610 | do | |
611 | firstcode = oldcode = gif_get_code(fp, code_size, 0); | |
612 | while (firstcode == clear_code); | |
613 | ||
614 | return (firstcode); | |
615 | } | |
616 | ||
617 | if (sp > stack) | |
618 | return (*--sp); | |
619 | ||
620 | while ((code = gif_get_code (fp, code_size, 0)) >= 0) | |
621 | { | |
622 | if (code == clear_code) | |
623 | { | |
624 | for (i = 0; i < clear_code; i ++) | |
625 | { | |
626 | table[0][i] = 0; | |
627 | table[1][i] = i; | |
628 | } | |
629 | ||
630 | for (; i < 4096; i ++) | |
631 | table[0][i] = table[1][i] = 0; | |
632 | ||
633 | code_size = set_code_size + 1; | |
634 | max_code_size = 2 * clear_code; | |
635 | max_code = clear_code + 2; | |
636 | ||
637 | sp = stack; | |
638 | ||
639 | firstcode = oldcode = gif_get_code(fp, code_size, 0); | |
640 | ||
641 | return (firstcode); | |
642 | } | |
643 | else if (code == end_code) | |
644 | { | |
645 | unsigned char buf[260]; | |
646 | ||
647 | ||
648 | if (!gif_eof) | |
649 | while (gif_get_block(fp, buf) > 0); | |
650 | ||
651 | return (-2); | |
652 | } | |
653 | ||
654 | incode = code; | |
655 | ||
656 | if (code >= max_code) | |
657 | { | |
658 | *sp++ = firstcode; | |
659 | code = oldcode; | |
660 | } | |
661 | ||
662 | while (code >= clear_code) | |
663 | { | |
664 | *sp++ = table[1][code]; | |
665 | if (code == table[0][code]) | |
666 | return (255); | |
667 | ||
668 | code = table[0][code]; | |
669 | } | |
670 | ||
671 | *sp++ = firstcode = table[1][code]; | |
672 | code = max_code; | |
673 | ||
674 | if (code < 4096) | |
675 | { | |
676 | table[0][code] = oldcode; | |
677 | table[1][code] = firstcode; | |
678 | max_code ++; | |
679 | ||
680 | if (max_code >= max_code_size && max_code_size < 4096) | |
681 | { | |
682 | max_code_size *= 2; | |
683 | code_size ++; | |
684 | } | |
685 | } | |
686 | ||
687 | oldcode = incode; | |
688 | ||
689 | if (sp > stack) | |
690 | return (*--sp); | |
691 | } | |
692 | ||
693 | return (code); | |
694 | } | |
695 | ||
696 | ||
697 | /* | |
f7deaa1a | 698 | * End of "$Id: image-gif.c 5508 2006-05-11 11:41:16Z mike $". |
ef416fc2 | 699 | */ |