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ef416fc2 | 1 | /* |
b423cd4c | 2 | * "$Id: raster.c 5192 2006-02-27 03:08:47Z mike $" |
ef416fc2 | 3 | * |
4 | * Raster file routines for the Common UNIX Printing System (CUPS). | |
5 | * | |
6 | * Copyright 1997-2006 by Easy Software Products. | |
7 | * | |
8 | * This file is part of the CUPS Imaging library. | |
9 | * | |
10 | * These coded instructions, statements, and computer programs are the | |
11 | * property of Easy Software Products and are protected by Federal | |
12 | * copyright law. Distribution and use rights are outlined in the file | |
13 | * "LICENSE.txt" which should have been included with this file. If this | |
14 | * file is missing or damaged please contact Easy Software Products | |
15 | * at: | |
16 | * | |
17 | * Attn: CUPS Licensing Information | |
18 | * Easy Software Products | |
19 | * 44141 Airport View Drive, Suite 204 | |
20 | * Hollywood, Maryland 20636 USA | |
21 | * | |
22 | * Voice: (301) 373-9600 | |
23 | * EMail: cups-info@cups.org | |
24 | * WWW: http://www.cups.org | |
25 | * | |
26 | * This code and any derivative of it may be used and distributed | |
27 | * freely under the terms of the GNU General Public License when | |
28 | * used with GNU/GPL Ghostscript or its derivatives. Use of the | |
29 | * code (or any derivative of it) with software other than GNU/GPL | |
30 | * GhostScript (or its derivatives) is governed by the CUPS license | |
31 | * agreement. | |
32 | * | |
33 | * This file is subject to the Apple OS-Developed Software exception. | |
34 | * | |
35 | * Contents: | |
36 | * | |
37 | * cupsRasterClose() - Close a raster stream. | |
38 | * cupsRasterOpen() - Open a raster stream. | |
b423cd4c | 39 | * cupsRasterReadHeader() - Read a raster page header and store it in a |
40 | * V1 page header structure. | |
41 | * cupsRasterReadHeader2() - Read a raster page header and store it in a | |
42 | * V2 page header structure. | |
ef416fc2 | 43 | * cupsRasterReadPixels() - Read raster pixels. |
b423cd4c | 44 | * cupsRasterWriteHeader() - Write a raster page header from a V1 page |
45 | * header structure. | |
46 | * cupsRasterWriteHeader2() - Write a raster page header from a V2 page | |
47 | * header structure. | |
ef416fc2 | 48 | * cupsRasterWritePixels() - Write raster pixels. |
49 | * cups_raster_update() - Update the raster header and row count for the | |
50 | * current page. | |
51 | * cups_raster_write() - Write a row of raster data... | |
52 | * cups_read() - Read bytes from a file. | |
53 | * cups_write() - Write bytes to a file. | |
54 | */ | |
55 | ||
56 | /* | |
57 | * Include necessary headers... | |
58 | */ | |
59 | ||
60 | #include "raster.h" | |
61 | #include <stdio.h> | |
62 | #include <stdlib.h> | |
63 | #include <errno.h> | |
64 | #include <cups/string.h> | |
65 | ||
66 | #if defined(WIN32) || defined(__EMX__) | |
67 | # include <io.h> | |
68 | #else | |
69 | # include <unistd.h> | |
70 | #endif /* WIN32 || __EMX__ */ | |
71 | ||
72 | ||
73 | /* | |
74 | * Local functions... | |
75 | */ | |
76 | ||
77 | static unsigned cups_raster_read_header(cups_raster_t *r); | |
78 | static void cups_raster_update(cups_raster_t *r); | |
79 | static int cups_raster_write(cups_raster_t *r); | |
80 | static int cups_read(int fd, unsigned char *buf, int bytes); | |
81 | static int cups_write(int fd, const unsigned char *buf, int bytes); | |
82 | ||
83 | ||
84 | /* | |
85 | * 'cupsRasterClose()' - Close a raster stream. | |
86 | */ | |
87 | ||
88 | void | |
89 | cupsRasterClose(cups_raster_t *r) /* I - Stream to close */ | |
90 | { | |
91 | if (r != NULL) | |
92 | { | |
93 | if (r->pixels) | |
94 | free(r->pixels); | |
95 | ||
96 | free(r); | |
97 | } | |
98 | } | |
99 | ||
100 | ||
101 | /* | |
102 | * 'cupsRasterOpen()' - Open a raster stream. | |
103 | */ | |
104 | ||
105 | cups_raster_t * /* O - New stream */ | |
106 | cupsRasterOpen(int fd, /* I - File descriptor */ | |
107 | cups_mode_t mode) /* I - Mode */ | |
108 | { | |
109 | cups_raster_t *r; /* New stream */ | |
110 | ||
111 | ||
112 | if ((r = calloc(sizeof(cups_raster_t), 1)) == NULL) | |
113 | return (NULL); | |
114 | ||
115 | r->fd = fd; | |
116 | r->mode = mode; | |
117 | ||
118 | if (mode == CUPS_RASTER_READ) | |
119 | { | |
120 | /* | |
121 | * Open for read - get sync word... | |
122 | */ | |
123 | ||
124 | if (cups_read(r->fd, (unsigned char *)&(r->sync), sizeof(r->sync)) | |
125 | < sizeof(r->sync)) | |
126 | { | |
127 | free(r); | |
128 | return (NULL); | |
129 | } | |
130 | ||
131 | if (r->sync != CUPS_RASTER_SYNC && | |
132 | r->sync != CUPS_RASTER_REVSYNC && | |
133 | r->sync != CUPS_RASTER_SYNCv1 && | |
134 | r->sync != CUPS_RASTER_REVSYNCv1) | |
135 | { | |
136 | free(r); | |
137 | return (NULL); | |
138 | } | |
139 | } | |
140 | else | |
141 | { | |
142 | /* | |
143 | * Open for write - put sync word... | |
144 | */ | |
145 | ||
146 | r->sync = CUPS_RASTER_SYNC; | |
147 | if (cups_write(r->fd, (unsigned char *)&(r->sync), sizeof(r->sync)) | |
148 | < sizeof(r->sync)) | |
149 | { | |
150 | free(r); | |
151 | return (NULL); | |
152 | } | |
153 | } | |
154 | ||
155 | return (r); | |
156 | } | |
157 | ||
158 | ||
159 | /* | |
b423cd4c | 160 | * 'cupsRasterReadHeader()' - Read a raster page header and store it in a |
161 | * V1 page header structure. | |
ef416fc2 | 162 | */ |
163 | ||
164 | unsigned /* O - 1 on success, 0 on fail */ | |
165 | cupsRasterReadHeader( | |
166 | cups_raster_t *r, /* I - Raster stream */ | |
167 | cups_page_header_t *h) /* I - Pointer to header data */ | |
168 | { | |
169 | /* | |
170 | * Get the raster header... | |
171 | */ | |
172 | ||
173 | if (!cups_raster_read_header(r)) | |
174 | return (0); | |
175 | ||
176 | /* | |
177 | * Copy the header to the user-supplied buffer... | |
178 | */ | |
179 | ||
180 | memcpy(h, &(r->header), sizeof(cups_page_header_t)); | |
181 | ||
182 | return (1); | |
183 | } | |
184 | ||
185 | ||
186 | /* | |
b423cd4c | 187 | * 'cupsRasterReadHeader2()' - Read a raster page header and store it in a |
188 | * V2 page header structure. | |
ef416fc2 | 189 | * |
190 | * @since CUPS 1.2@ | |
191 | */ | |
192 | ||
193 | unsigned /* O - 1 on success, 0 on fail */ | |
194 | cupsRasterReadHeader2( | |
195 | cups_raster_t *r, /* I - Raster stream */ | |
196 | cups_page_header2_t *h) /* I - Pointer to header data */ | |
197 | { | |
198 | /* | |
199 | * Get the raster header... | |
200 | */ | |
201 | ||
202 | if (!cups_raster_read_header(r)) | |
203 | return (0); | |
204 | ||
205 | /* | |
206 | * Copy the header to the user-supplied buffer... | |
207 | */ | |
208 | ||
209 | memcpy(h, &(r->header), sizeof(cups_page_header2_t)); | |
210 | ||
211 | return (1); | |
212 | } | |
213 | ||
214 | ||
215 | /* | |
216 | * 'cupsRasterReadPixels()' - Read raster pixels. | |
217 | */ | |
218 | ||
219 | unsigned /* O - Number of bytes read */ | |
220 | cupsRasterReadPixels(cups_raster_t *r, /* I - Raster stream */ | |
221 | unsigned char *p, /* I - Pointer to pixel buffer */ | |
222 | unsigned len) /* I - Number of bytes to read */ | |
223 | { | |
224 | int bytes; /* Bytes read */ | |
225 | unsigned remaining; /* Bytes remaining */ | |
226 | unsigned char *ptr, /* Pointer to read buffer */ | |
227 | byte; /* Byte from file */ | |
228 | ||
229 | ||
230 | if (r == NULL || r->mode != CUPS_RASTER_READ || r->remaining == 0) | |
231 | return (0); | |
232 | ||
233 | remaining = len; | |
234 | ||
235 | while (remaining > 0 && r->remaining > 0) | |
236 | { | |
237 | if (r->count == 0) | |
238 | { | |
239 | /* | |
240 | * Need to read a new row... | |
241 | */ | |
242 | ||
243 | if (remaining == r->header.cupsBytesPerLine) | |
244 | ptr = p; | |
245 | else | |
246 | ptr = r->pixels; | |
247 | ||
248 | if (r->sync == CUPS_RASTER_SYNCv1 || r->sync == CUPS_RASTER_REVSYNCv1) | |
249 | { | |
250 | /* | |
251 | * Read without compression... | |
252 | */ | |
253 | ||
254 | if (cups_read(r->fd, ptr, r->header.cupsBytesPerLine) < | |
255 | r->header.cupsBytesPerLine) | |
256 | return (0); | |
257 | ||
258 | r->count = 1; | |
259 | } | |
260 | else | |
261 | { | |
262 | /* | |
263 | * Read using a modified TIFF "packbits" compression... | |
264 | */ | |
265 | ||
266 | unsigned char *temp; /* Pointer into buffer */ | |
267 | int count; /* Repetition count */ | |
268 | ||
269 | ||
270 | if (cups_read(r->fd, &byte, 1) < 1) | |
271 | return (0); | |
272 | ||
273 | r->count = byte + 1; | |
274 | ||
275 | if (r->count > 1) | |
276 | ptr = r->pixels; | |
277 | ||
278 | temp = ptr; | |
279 | bytes = r->header.cupsBytesPerLine; | |
280 | ||
281 | while (bytes > 0) | |
282 | { | |
283 | /* | |
284 | * Get a new repeat count... | |
285 | */ | |
286 | ||
287 | if (cups_read(r->fd, &byte, 1) < 1) | |
288 | return (0); | |
289 | ||
290 | if (byte & 128) | |
291 | { | |
292 | /* | |
293 | * Copy N literal pixels... | |
294 | */ | |
295 | ||
296 | count = (257 - byte) * r->bpp; | |
297 | ||
298 | if (count > bytes) | |
299 | count = bytes; | |
300 | ||
301 | if (cups_read(r->fd, temp, count) < count) | |
302 | return (0); | |
303 | ||
304 | temp += count; | |
305 | bytes -= count; | |
306 | } | |
307 | else | |
308 | { | |
309 | /* | |
310 | * Repeat the next N bytes... | |
311 | */ | |
312 | ||
313 | count = (byte + 1) * r->bpp; | |
314 | if (count > bytes) | |
315 | count = bytes; | |
316 | ||
317 | if (count < r->bpp) | |
318 | break; | |
319 | ||
320 | bytes -= count; | |
321 | ||
322 | if (cups_read(r->fd, temp, r->bpp) < r->bpp) | |
323 | return (0); | |
324 | ||
325 | temp += r->bpp; | |
326 | count -= r->bpp; | |
327 | ||
328 | while (count > 0) | |
329 | { | |
330 | memcpy(temp, temp - r->bpp, r->bpp); | |
331 | temp += r->bpp; | |
332 | count -= r->bpp; | |
333 | } | |
334 | } | |
335 | } | |
336 | } | |
337 | ||
338 | if (r->header.cupsBitsPerColor == 16 && | |
339 | (r->sync == CUPS_RASTER_REVSYNC || r->sync == CUPS_RASTER_REVSYNCv1)) | |
340 | { | |
341 | /* | |
342 | * Swap bytes in the pixel data... | |
343 | */ | |
344 | ||
345 | unsigned char *temp; | |
346 | int count; | |
347 | ||
348 | ||
349 | for (temp = ptr, count = r->header.cupsBytesPerLine; | |
350 | count > 0; | |
351 | temp += 2, count -= 2) | |
352 | { | |
353 | byte = temp[0]; | |
354 | temp[0] = temp[1]; | |
355 | temp[1] = byte; | |
356 | } | |
357 | } | |
358 | ||
359 | if (remaining >= r->header.cupsBytesPerLine) | |
360 | { | |
361 | bytes = r->header.cupsBytesPerLine; | |
362 | r->pcurrent = r->pixels; | |
363 | r->count --; | |
364 | r->remaining --; | |
365 | } | |
366 | else | |
367 | { | |
368 | bytes = remaining; | |
369 | r->pcurrent = r->pixels + bytes; | |
370 | } | |
371 | ||
372 | if (ptr != p) | |
373 | memcpy(p, ptr, bytes); | |
374 | } | |
375 | else | |
376 | { | |
377 | /* | |
378 | * Copy fragment from buffer... | |
379 | */ | |
380 | ||
381 | if ((bytes = r->pend - r->pcurrent) > remaining) | |
382 | bytes = remaining; | |
383 | ||
384 | memcpy(p, r->pcurrent, bytes); | |
385 | r->pcurrent += bytes; | |
386 | ||
387 | if (r->pcurrent >= r->pend) | |
388 | { | |
389 | r->pcurrent = r->pixels; | |
390 | r->count --; | |
391 | r->remaining --; | |
392 | } | |
393 | } | |
394 | ||
395 | remaining -= bytes; | |
396 | p += bytes; | |
397 | } | |
398 | ||
399 | return (len); | |
400 | } | |
401 | ||
402 | ||
403 | /* | |
b423cd4c | 404 | * 'cupsRasterWriteHeader()' - Write a raster page header from a V1 page |
405 | * header structure. | |
ef416fc2 | 406 | */ |
407 | ||
408 | unsigned /* O - 1 on success, 0 on failure */ | |
409 | cupsRasterWriteHeader( | |
410 | cups_raster_t *r, /* I - Raster stream */ | |
411 | cups_page_header_t *h) /* I - Raster page header */ | |
412 | { | |
413 | if (r == NULL || r->mode != CUPS_RASTER_WRITE) | |
414 | return (0); | |
415 | ||
416 | /* | |
417 | * Make a copy of the header, and compute the number of raster | |
418 | * lines in the page image... | |
419 | */ | |
420 | ||
421 | memset(&(r->header), 0, sizeof(r->header)); | |
422 | memcpy(&(r->header), h, sizeof(cups_page_header_t)); | |
423 | ||
424 | cups_raster_update(r); | |
425 | ||
426 | /* | |
427 | * Write the raster header... | |
428 | */ | |
429 | ||
430 | return (cups_write(r->fd, (unsigned char *)&(r->header), sizeof(r->header)) | |
431 | > 0); | |
432 | } | |
433 | ||
434 | ||
435 | /* | |
b423cd4c | 436 | * 'cupsRasterWriteHeader2()' - Write a raster page header from a V2 page |
437 | * header structure. | |
ef416fc2 | 438 | * |
439 | * @since CUPS 1.2@ | |
440 | */ | |
441 | ||
442 | unsigned /* O - 1 on success, 0 on failure */ | |
443 | cupsRasterWriteHeader2( | |
444 | cups_raster_t *r, /* I - Raster stream */ | |
445 | cups_page_header2_t *h) /* I - Raster page header */ | |
446 | { | |
447 | if (r == NULL || r->mode != CUPS_RASTER_WRITE) | |
448 | return (0); | |
449 | ||
450 | /* | |
451 | * Make a copy of the header, and compute the number of raster | |
452 | * lines in the page image... | |
453 | */ | |
454 | ||
455 | memcpy(&(r->header), h, sizeof(cups_page_header2_t)); | |
456 | ||
457 | cups_raster_update(r); | |
458 | ||
459 | /* | |
460 | * Write the raster header... | |
461 | */ | |
462 | ||
463 | return (cups_write(r->fd, (unsigned char *)&(r->header), sizeof(r->header)) | |
464 | > 0); | |
465 | } | |
466 | ||
467 | ||
468 | /* | |
469 | * 'cupsRasterWritePixels()' - Write raster pixels. | |
470 | */ | |
471 | ||
472 | unsigned /* O - Number of bytes written */ | |
473 | cupsRasterWritePixels(cups_raster_t *r, /* I - Raster stream */ | |
474 | unsigned char *p, /* I - Bytes to write */ | |
475 | unsigned len)/* I - Number of bytes to write */ | |
476 | { | |
477 | int bytes; /* Bytes read */ | |
478 | unsigned remaining; /* Bytes remaining */ | |
479 | ||
480 | ||
481 | if (r == NULL || r->mode != CUPS_RASTER_WRITE || r->remaining == 0) | |
482 | return (0); | |
483 | ||
484 | remaining = len; | |
485 | ||
486 | while (remaining > 0) | |
487 | { | |
488 | /* | |
489 | * Figure out the number of remaining bytes on the current line... | |
490 | */ | |
491 | ||
492 | if ((bytes = remaining) > (r->pend - r->pcurrent)) | |
493 | bytes = r->pend - r->pcurrent; | |
494 | ||
495 | if (r->count > 0) | |
496 | { | |
497 | /* | |
498 | * Check to see if this line is the same as the previous line... | |
499 | */ | |
500 | ||
501 | if (memcmp(p, r->pcurrent, bytes)) | |
502 | { | |
503 | if (!cups_raster_write(r)) | |
504 | return (0); | |
505 | ||
506 | r->count = 0; | |
507 | } | |
508 | else | |
509 | { | |
510 | /* | |
511 | * Mark more bytes as the same... | |
512 | */ | |
513 | ||
514 | r->pcurrent += bytes; | |
515 | ||
516 | if (r->pcurrent >= r->pend) | |
517 | { | |
518 | /* | |
519 | * Increase the repeat count... | |
520 | */ | |
521 | ||
522 | r->count ++; | |
523 | r->pcurrent = r->pixels; | |
524 | ||
525 | /* | |
526 | * Flush out this line if it is the last one... | |
527 | */ | |
528 | ||
529 | r->remaining --; | |
530 | if (r->remaining == 0) | |
531 | return (cups_raster_write(r)); | |
532 | else if (r->count == 256) | |
533 | { | |
534 | cups_raster_write(r); | |
535 | r->count = 0; | |
536 | } | |
537 | } | |
538 | } | |
539 | } | |
540 | ||
541 | if (r->count == 0) | |
542 | { | |
543 | /* | |
544 | * Copy the raster data to the buffer... | |
545 | */ | |
546 | ||
547 | memcpy(r->pcurrent, p, bytes); | |
548 | ||
549 | r->pcurrent += bytes; | |
550 | ||
551 | if (r->pcurrent >= r->pend) | |
552 | { | |
553 | /* | |
554 | * Increase the repeat count... | |
555 | */ | |
556 | ||
557 | r->count ++; | |
558 | r->pcurrent = r->pixels; | |
559 | ||
560 | /* | |
561 | * Flush out this line if it is the last one... | |
562 | */ | |
563 | ||
564 | r->remaining --; | |
565 | if (r->remaining == 0) | |
566 | return (cups_raster_write(r)); | |
567 | } | |
568 | } | |
569 | ||
570 | remaining -= bytes; | |
571 | p += bytes; | |
572 | } | |
573 | ||
574 | return (len); | |
575 | } | |
576 | ||
577 | ||
578 | /* | |
579 | * 'cups_raster_read_header()' - Read a raster page header. | |
580 | */ | |
581 | ||
582 | static unsigned /* O - 1 on success, 0 on fail */ | |
583 | cups_raster_read_header( | |
584 | cups_raster_t *r) /* I - Raster stream */ | |
585 | { | |
586 | int len; /* Number of words to swap */ | |
587 | union swap_s /* Swapping structure */ | |
588 | { | |
589 | unsigned char b[4]; | |
590 | unsigned v; | |
591 | } *s; | |
592 | ||
593 | ||
594 | if (r == NULL || r->mode != CUPS_RASTER_READ) | |
595 | return (0); | |
596 | ||
597 | /* | |
598 | * Get the length of the raster header... | |
599 | */ | |
600 | ||
601 | if (r->sync == CUPS_RASTER_SYNCv1 || r->sync == CUPS_RASTER_REVSYNCv1) | |
602 | len = sizeof(cups_page_header_t); | |
603 | else | |
604 | len = sizeof(cups_page_header2_t); | |
605 | ||
606 | /* | |
607 | * Read the header... | |
608 | */ | |
609 | ||
610 | memset(&(r->header), 0, sizeof(r->header)); | |
611 | ||
612 | if (cups_read(r->fd, (unsigned char *)&(r->header), len) < len) | |
613 | return (0); | |
614 | ||
615 | /* | |
616 | * Swap bytes as needed... | |
617 | */ | |
618 | ||
619 | if (r->sync == CUPS_RASTER_REVSYNC || r->sync == CUPS_RASTER_REVSYNCv1) | |
fa73b229 | 620 | for (len = 81, s = (union swap_s *)&(r->header.AdvanceDistance); |
ef416fc2 | 621 | len > 0; |
622 | len --, s ++) | |
623 | s->v = (((((s->b[3] << 8) | s->b[2]) << 8) | s->b[1]) << 8) | s->b[0]; | |
624 | ||
625 | /* | |
626 | * Update the header and row count... | |
627 | */ | |
628 | ||
629 | cups_raster_update(r); | |
630 | ||
631 | return (1); | |
632 | } | |
633 | ||
634 | ||
635 | /* | |
636 | * 'cups_raster_update()' - Update the raster header and row count for the | |
637 | * current page. | |
638 | */ | |
639 | ||
640 | static void | |
641 | cups_raster_update(cups_raster_t *r) /* I - Raster stream */ | |
642 | { | |
643 | if (r->sync == CUPS_RASTER_SYNCv1 || r->sync == CUPS_RASTER_REVSYNCv1) | |
644 | { | |
645 | /* | |
646 | * Set the "cupsNumColors" field according to the colorspace... | |
647 | */ | |
648 | ||
649 | switch (r->header.cupsColorSpace) | |
650 | { | |
651 | case CUPS_CSPACE_W : | |
652 | case CUPS_CSPACE_K : | |
653 | case CUPS_CSPACE_WHITE : | |
654 | case CUPS_CSPACE_GOLD : | |
655 | case CUPS_CSPACE_SILVER : | |
656 | case CUPS_CSPACE_ICC1 : | |
657 | r->header.cupsNumColors = 1; | |
658 | break; | |
659 | ||
660 | case CUPS_CSPACE_ICC2 : | |
661 | r->header.cupsNumColors = 2; | |
662 | break; | |
663 | ||
664 | case CUPS_CSPACE_RGB : | |
665 | case CUPS_CSPACE_CMY : | |
666 | case CUPS_CSPACE_YMC : | |
667 | case CUPS_CSPACE_CIEXYZ : | |
668 | case CUPS_CSPACE_CIELab : | |
669 | case CUPS_CSPACE_ICC3 : | |
670 | r->header.cupsNumColors = 3; | |
671 | break; | |
672 | ||
673 | case CUPS_CSPACE_RGBA : | |
674 | case CUPS_CSPACE_RGBW : | |
675 | case CUPS_CSPACE_CMYK : | |
676 | case CUPS_CSPACE_YMCK : | |
677 | case CUPS_CSPACE_KCMY : | |
678 | case CUPS_CSPACE_GMCK : | |
679 | case CUPS_CSPACE_GMCS : | |
680 | case CUPS_CSPACE_ICC4 : | |
681 | r->header.cupsNumColors = 4; | |
682 | break; | |
683 | ||
684 | case CUPS_CSPACE_KCMYcm : | |
685 | if (r->header.cupsBitsPerPixel < 8) | |
686 | r->header.cupsNumColors = 6; | |
687 | else | |
688 | r->header.cupsNumColors = 4; | |
689 | break; | |
690 | ||
691 | case CUPS_CSPACE_ICC5 : | |
692 | case CUPS_CSPACE_ICC6 : | |
693 | case CUPS_CSPACE_ICC7 : | |
694 | case CUPS_CSPACE_ICC8 : | |
695 | case CUPS_CSPACE_ICC9 : | |
696 | case CUPS_CSPACE_ICCA : | |
697 | case CUPS_CSPACE_ICCB : | |
698 | case CUPS_CSPACE_ICCC : | |
699 | case CUPS_CSPACE_ICCD : | |
700 | case CUPS_CSPACE_ICCE : | |
701 | case CUPS_CSPACE_ICCF : | |
702 | r->header.cupsNumColors = r->header.cupsColorSpace - | |
703 | CUPS_CSPACE_ICC1 + 1; | |
704 | break; | |
705 | } | |
706 | } | |
707 | ||
708 | /* | |
709 | * Set the number of bytes per pixel/color... | |
710 | */ | |
711 | ||
712 | if (r->header.cupsColorOrder == CUPS_ORDER_CHUNKED) | |
713 | r->bpp = (r->header.cupsBitsPerPixel + 7) / 8; | |
714 | else | |
715 | r->bpp = (r->header.cupsBitsPerColor + 7) / 8; | |
716 | ||
717 | /* | |
718 | * Set the number of remaining rows... | |
719 | */ | |
720 | ||
721 | if (r->header.cupsColorOrder == CUPS_ORDER_PLANAR) | |
722 | r->remaining = r->header.cupsHeight * r->header.cupsNumColors; | |
723 | else | |
724 | r->remaining = r->header.cupsHeight; | |
725 | ||
726 | /* | |
727 | * Allocate the read/write buffer... | |
728 | */ | |
729 | ||
730 | if (r->pixels != NULL) | |
731 | free(r->pixels); | |
732 | ||
733 | r->pixels = calloc(r->header.cupsBytesPerLine, 1); | |
734 | r->pcurrent = r->pixels; | |
735 | r->pend = r->pixels + r->header.cupsBytesPerLine; | |
736 | r->count = 0; | |
737 | } | |
738 | ||
739 | ||
740 | /* | |
741 | * 'cups_raster_write()' - Write a row of raster data... | |
742 | */ | |
743 | ||
744 | static int /* O - Number of bytes written */ | |
745 | cups_raster_write(cups_raster_t *r) /* I - Raster stream */ | |
746 | { | |
747 | unsigned char *start, /* Start of sequence */ | |
748 | *ptr, /* Current pointer in sequence */ | |
749 | byte; /* Byte to write */ | |
750 | int count; /* Count */ | |
751 | ||
752 | ||
753 | /* | |
754 | * Write the row repeat count... | |
755 | */ | |
756 | ||
757 | byte = r->count - 1; | |
758 | ||
759 | if (cups_write(r->fd, &byte, 1) < 1) | |
760 | return (0); | |
761 | ||
762 | /* | |
763 | * Write using a modified TIFF "packbits" compression... | |
764 | */ | |
765 | ||
766 | for (ptr = r->pixels; ptr < r->pend;) | |
767 | { | |
768 | start = ptr; | |
769 | ptr += r->bpp; | |
770 | ||
771 | if (ptr == r->pend) | |
772 | { | |
773 | /* | |
774 | * Encode a single pixel at the end... | |
775 | */ | |
776 | ||
777 | byte = 0; | |
778 | if (cups_write(r->fd, &byte, 1) < 1) | |
779 | return (0); | |
780 | ||
781 | if (cups_write(r->fd, start, r->bpp) < r->bpp) | |
782 | return (0); | |
783 | } | |
784 | else if (!memcmp(start, ptr, r->bpp)) | |
785 | { | |
786 | /* | |
787 | * Encode a sequence of repeating pixels... | |
788 | */ | |
789 | ||
790 | for (count = 2; count < 128 && ptr < (r->pend - r->bpp); count ++, ptr += r->bpp) | |
791 | if (memcmp(ptr, ptr + r->bpp, r->bpp) != 0) | |
792 | break; | |
793 | ||
794 | ptr += r->bpp; | |
795 | ||
796 | byte = count - 1; | |
797 | ||
798 | if (cups_write(r->fd, &byte, 1) < 1) | |
799 | return (0); | |
800 | ||
801 | if (cups_write(r->fd, start, r->bpp) < r->bpp) | |
802 | return (0); | |
803 | } | |
804 | else | |
805 | { | |
806 | /* | |
807 | * Encode a sequence of non-repeating pixels... | |
808 | */ | |
809 | ||
810 | for (count = 1; count < 127 && ptr < (r->pend - r->bpp); count ++, ptr += r->bpp) | |
811 | if (!memcmp(ptr, ptr + r->bpp, r->bpp)) | |
812 | break; | |
813 | ||
814 | if (ptr >= (r->pend - r->bpp) && count < 128) | |
815 | { | |
816 | count ++; | |
817 | ptr += r->bpp; | |
818 | } | |
819 | ||
820 | byte = 257 - count; | |
821 | ||
822 | if (cups_write(r->fd, &byte, 1) < 1) | |
823 | return (0); | |
824 | ||
825 | count *= r->bpp; | |
826 | ||
827 | if (cups_write(r->fd, start, count) < count) | |
828 | return (0); | |
829 | } | |
830 | } | |
831 | ||
832 | return (r->header.cupsBytesPerLine); | |
833 | } | |
834 | ||
835 | ||
836 | /* | |
837 | * 'cups_read()' - Read bytes from a file. | |
838 | */ | |
839 | ||
840 | static int /* O - Bytes read or -1 */ | |
841 | cups_read(int fd, /* I - File descriptor */ | |
842 | unsigned char *buf, /* I - Buffer for read */ | |
843 | int bytes) /* I - Number of bytes to read */ | |
844 | { | |
845 | int count, /* Number of bytes read */ | |
846 | total; /* Total bytes read */ | |
847 | ||
848 | ||
849 | for (total = 0; total < bytes; total += count, buf += count) | |
850 | { | |
851 | count = read(fd, buf, bytes - total); | |
852 | ||
853 | if (count == 0) | |
854 | return (0); | |
855 | else if (count < 0) | |
856 | { | |
857 | if (errno == EINTR) | |
858 | count = 0; | |
859 | else | |
860 | return (-1); | |
861 | } | |
862 | } | |
863 | ||
864 | return (total); | |
865 | } | |
866 | ||
867 | ||
868 | /* | |
869 | * 'cups_write()' - Write bytes to a file. | |
870 | */ | |
871 | ||
872 | static int /* O - Bytes written or -1 */ | |
873 | cups_write(int fd, /* I - File descriptor */ | |
874 | const unsigned char *buf, /* I - Bytes to write */ | |
875 | int bytes) /* I - Number of bytes to write */ | |
876 | { | |
877 | int count, /* Number of bytes written */ | |
878 | total; /* Total bytes written */ | |
879 | ||
880 | ||
881 | for (total = 0; total < bytes; total += count, buf += count) | |
882 | { | |
883 | count = write(fd, buf, bytes - total); | |
884 | ||
885 | if (count < 0) | |
886 | { | |
887 | if (errno == EINTR) | |
888 | count = 0; | |
889 | else | |
890 | return (-1); | |
891 | } | |
892 | } | |
893 | ||
894 | return (total); | |
895 | } | |
896 | ||
897 | ||
898 | /* | |
b423cd4c | 899 | * End of "$Id: raster.c 5192 2006-02-27 03:08:47Z mike $". |
ef416fc2 | 900 | */ |