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ef416fc2 | 1 | /* |
c07d5b2d | 2 | * "$Id: raster.c 181 2006-06-22 20:01:18Z jlovell $" |
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 | * | |
ed486911 | 37 | * cupsRasterClose() - Close a raster stream. |
38 | * cupsRasterOpen() - Open a raster stream. | |
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. | |
43 | * cupsRasterReadPixels() - Read raster pixels. | |
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. | |
48 | * cupsRasterWritePixels() - Write raster pixels. | |
49 | * cups_raster_read() - Read through the raster buffer. | |
50 | * cups_raster_read_header() - Read a raster page header. | |
51 | * cups_raster_update() - Update the raster header and row count for the | |
52 | * current page. | |
53 | * cups_raster_write() - Write a row of raster data... | |
54 | * cups_read() - Read bytes from a file. | |
55 | * cups_swap() - Swap bytes in raster data... | |
56 | * cups_write() - Write bytes to a file. | |
ef416fc2 | 57 | */ |
58 | ||
59 | /* | |
60 | * Include necessary headers... | |
61 | */ | |
62 | ||
63 | #include "raster.h" | |
ed486911 | 64 | #include <cups/debug.h> |
ef416fc2 | 65 | #include <stdlib.h> |
66 | #include <errno.h> | |
67 | #include <cups/string.h> | |
68 | ||
69 | #if defined(WIN32) || defined(__EMX__) | |
70 | # include <io.h> | |
71 | #else | |
72 | # include <unistd.h> | |
73 | #endif /* WIN32 || __EMX__ */ | |
74 | ||
75 | ||
f301802f | 76 | /* |
77 | * Private structures... | |
78 | */ | |
79 | ||
80 | struct _cups_raster_s /**** Raster stream data ****/ | |
81 | { | |
82 | unsigned sync; /* Sync word from start of stream */ | |
83 | int fd; /* File descriptor */ | |
84 | cups_mode_t mode; /* Read/write mode */ | |
85 | cups_page_header2_t header; /* Raster header for current page */ | |
86 | int count, /* Current row run-length count */ | |
87 | remaining, /* Remaining rows in page image */ | |
88 | bpp; /* Bytes per pixel/color */ | |
89 | unsigned char *pixels, /* Pixels for current row */ | |
90 | *pend, /* End of pixel buffer */ | |
91 | *pcurrent; /* Current byte in pixel buffer */ | |
ed486911 | 92 | int compressed, /* Non-zero if data is compressed */ |
93 | swapped; /* Non-zero if data is byte-swapped */ | |
94 | unsigned char *buffer, /* Read/write buffer */ | |
95 | *bufptr, /* Current (read) position in buffer */ | |
96 | *bufend; /* End of current (read) buffer */ | |
97 | int bufsize; /* Buffer size */ | |
f301802f | 98 | }; |
99 | ||
ed486911 | 100 | |
ef416fc2 | 101 | /* |
102 | * Local functions... | |
103 | */ | |
104 | ||
105 | static unsigned cups_raster_read_header(cups_raster_t *r); | |
ed486911 | 106 | static int cups_raster_read(cups_raster_t *r, unsigned char *buf, |
107 | int bytes); | |
ef416fc2 | 108 | static void cups_raster_update(cups_raster_t *r); |
ed486911 | 109 | static int cups_raster_write(cups_raster_t *r, const unsigned char *pixels); |
ef416fc2 | 110 | static int cups_read(int fd, unsigned char *buf, int bytes); |
ed486911 | 111 | static void cups_swap(unsigned char *buf, int bytes); |
ef416fc2 | 112 | static int cups_write(int fd, const unsigned char *buf, int bytes); |
113 | ||
114 | ||
115 | /* | |
116 | * 'cupsRasterClose()' - Close a raster stream. | |
117 | */ | |
118 | ||
119 | void | |
120 | cupsRasterClose(cups_raster_t *r) /* I - Stream to close */ | |
121 | { | |
122 | if (r != NULL) | |
123 | { | |
ed486911 | 124 | if (r->buffer) |
125 | free(r->buffer); | |
126 | ||
ef416fc2 | 127 | if (r->pixels) |
128 | free(r->pixels); | |
129 | ||
130 | free(r); | |
131 | } | |
132 | } | |
133 | ||
134 | ||
135 | /* | |
136 | * 'cupsRasterOpen()' - Open a raster stream. | |
137 | */ | |
138 | ||
139 | cups_raster_t * /* O - New stream */ | |
140 | cupsRasterOpen(int fd, /* I - File descriptor */ | |
141 | cups_mode_t mode) /* I - Mode */ | |
142 | { | |
143 | cups_raster_t *r; /* New stream */ | |
144 | ||
145 | ||
146 | if ((r = calloc(sizeof(cups_raster_t), 1)) == NULL) | |
147 | return (NULL); | |
148 | ||
149 | r->fd = fd; | |
ed486911 | 150 | r->mode = mode == CUPS_RASTER_WRITE_COMPRESSED ? CUPS_RASTER_WRITE : mode; |
ef416fc2 | 151 | |
152 | if (mode == CUPS_RASTER_READ) | |
153 | { | |
154 | /* | |
155 | * Open for read - get sync word... | |
156 | */ | |
157 | ||
ed486911 | 158 | if (!cups_read(r->fd, (unsigned char *)&(r->sync), sizeof(r->sync))) |
ef416fc2 | 159 | { |
160 | free(r); | |
161 | return (NULL); | |
162 | } | |
163 | ||
164 | if (r->sync != CUPS_RASTER_SYNC && | |
165 | r->sync != CUPS_RASTER_REVSYNC && | |
166 | r->sync != CUPS_RASTER_SYNCv1 && | |
ed486911 | 167 | r->sync != CUPS_RASTER_REVSYNCv1 && |
168 | r->sync != CUPS_RASTER_SYNCv2 && | |
169 | r->sync != CUPS_RASTER_REVSYNCv2) | |
ef416fc2 | 170 | { |
171 | free(r); | |
172 | return (NULL); | |
173 | } | |
ed486911 | 174 | |
175 | if (r->sync == CUPS_RASTER_SYNCv2 || | |
176 | r->sync == CUPS_RASTER_REVSYNCv2) | |
177 | r->compressed = 1; | |
178 | ||
179 | if (r->sync == CUPS_RASTER_REVSYNC || | |
180 | r->sync == CUPS_RASTER_REVSYNCv1 || | |
181 | r->sync == CUPS_RASTER_REVSYNCv2) | |
182 | r->swapped = 1; | |
ef416fc2 | 183 | } |
184 | else | |
185 | { | |
186 | /* | |
187 | * Open for write - put sync word... | |
188 | */ | |
189 | ||
ed486911 | 190 | if (mode == CUPS_RASTER_WRITE_COMPRESSED) |
191 | { | |
192 | r->compressed = 1; | |
193 | r->sync = CUPS_RASTER_SYNCv2; | |
194 | } | |
195 | else | |
196 | r->sync = CUPS_RASTER_SYNC; | |
197 | ||
ef416fc2 | 198 | if (cups_write(r->fd, (unsigned char *)&(r->sync), sizeof(r->sync)) |
199 | < sizeof(r->sync)) | |
200 | { | |
201 | free(r); | |
202 | return (NULL); | |
203 | } | |
204 | } | |
205 | ||
206 | return (r); | |
207 | } | |
208 | ||
209 | ||
210 | /* | |
b423cd4c | 211 | * 'cupsRasterReadHeader()' - Read a raster page header and store it in a |
212 | * V1 page header structure. | |
ef416fc2 | 213 | */ |
214 | ||
215 | unsigned /* O - 1 on success, 0 on fail */ | |
216 | cupsRasterReadHeader( | |
217 | cups_raster_t *r, /* I - Raster stream */ | |
218 | cups_page_header_t *h) /* I - Pointer to header data */ | |
219 | { | |
220 | /* | |
221 | * Get the raster header... | |
222 | */ | |
223 | ||
224 | if (!cups_raster_read_header(r)) | |
225 | return (0); | |
226 | ||
227 | /* | |
228 | * Copy the header to the user-supplied buffer... | |
229 | */ | |
230 | ||
231 | memcpy(h, &(r->header), sizeof(cups_page_header_t)); | |
232 | ||
233 | return (1); | |
234 | } | |
235 | ||
236 | ||
237 | /* | |
b423cd4c | 238 | * 'cupsRasterReadHeader2()' - Read a raster page header and store it in a |
239 | * V2 page header structure. | |
ef416fc2 | 240 | * |
241 | * @since CUPS 1.2@ | |
242 | */ | |
243 | ||
244 | unsigned /* O - 1 on success, 0 on fail */ | |
245 | cupsRasterReadHeader2( | |
246 | cups_raster_t *r, /* I - Raster stream */ | |
247 | cups_page_header2_t *h) /* I - Pointer to header data */ | |
248 | { | |
249 | /* | |
250 | * Get the raster header... | |
251 | */ | |
252 | ||
253 | if (!cups_raster_read_header(r)) | |
254 | return (0); | |
255 | ||
256 | /* | |
257 | * Copy the header to the user-supplied buffer... | |
258 | */ | |
259 | ||
260 | memcpy(h, &(r->header), sizeof(cups_page_header2_t)); | |
261 | ||
262 | return (1); | |
263 | } | |
264 | ||
265 | ||
266 | /* | |
267 | * 'cupsRasterReadPixels()' - Read raster pixels. | |
268 | */ | |
269 | ||
270 | unsigned /* O - Number of bytes read */ | |
271 | cupsRasterReadPixels(cups_raster_t *r, /* I - Raster stream */ | |
272 | unsigned char *p, /* I - Pointer to pixel buffer */ | |
273 | unsigned len) /* I - Number of bytes to read */ | |
274 | { | |
275 | int bytes; /* Bytes read */ | |
ed486911 | 276 | unsigned cupsBytesPerLine; /* cupsBytesPerLine value */ |
ef416fc2 | 277 | unsigned remaining; /* Bytes remaining */ |
278 | unsigned char *ptr, /* Pointer to read buffer */ | |
ed486911 | 279 | byte, /* Byte from file */ |
280 | *temp; /* Pointer into buffer */ | |
281 | int count; /* Repetition count */ | |
ef416fc2 | 282 | |
283 | ||
284 | if (r == NULL || r->mode != CUPS_RASTER_READ || r->remaining == 0) | |
285 | return (0); | |
286 | ||
ed486911 | 287 | if (!r->compressed) |
288 | { | |
289 | /* | |
290 | * Read without compression... | |
291 | */ | |
292 | ||
293 | r->remaining -= len / r->header.cupsBytesPerLine; | |
294 | ||
295 | if (!cups_read(r->fd, p, len)) | |
296 | return (0); | |
297 | ||
298 | /* | |
299 | * Swap bytes as needed... | |
300 | */ | |
301 | ||
302 | if ((r->header.cupsBitsPerColor == 16 || | |
303 | r->header.cupsBitsPerPixel == 12 || | |
304 | r->header.cupsBitsPerPixel == 16) && | |
305 | r->swapped) | |
306 | cups_swap(p, len); | |
307 | ||
308 | /* | |
309 | * Return... | |
310 | */ | |
311 | ||
312 | return (len); | |
313 | } | |
314 | ||
315 | /* | |
316 | * Read compressed data... | |
317 | */ | |
318 | ||
319 | remaining = len; | |
320 | cupsBytesPerLine = r->header.cupsBytesPerLine; | |
ef416fc2 | 321 | |
322 | while (remaining > 0 && r->remaining > 0) | |
323 | { | |
324 | if (r->count == 0) | |
325 | { | |
326 | /* | |
327 | * Need to read a new row... | |
328 | */ | |
329 | ||
ed486911 | 330 | if (remaining == cupsBytesPerLine) |
ef416fc2 | 331 | ptr = p; |
332 | else | |
333 | ptr = r->pixels; | |
334 | ||
ed486911 | 335 | /* |
336 | * Read using a modified TIFF "packbits" compression... | |
337 | */ | |
ef416fc2 | 338 | |
ed486911 | 339 | if (!cups_raster_read(r, &byte, 1)) |
340 | return (0); | |
ef416fc2 | 341 | |
ed486911 | 342 | r->count = byte + 1; |
343 | ||
344 | if (r->count > 1) | |
345 | ptr = r->pixels; | |
346 | ||
347 | temp = ptr; | |
348 | bytes = cupsBytesPerLine; | |
349 | ||
350 | while (bytes > 0) | |
ef416fc2 | 351 | { |
352 | /* | |
ed486911 | 353 | * Get a new repeat count... |
ef416fc2 | 354 | */ |
355 | ||
ed486911 | 356 | if (!cups_raster_read(r, &byte, 1)) |
ef416fc2 | 357 | return (0); |
358 | ||
ed486911 | 359 | if (byte & 128) |
ef416fc2 | 360 | { |
361 | /* | |
ed486911 | 362 | * Copy N literal pixels... |
ef416fc2 | 363 | */ |
364 | ||
ed486911 | 365 | count = (257 - byte) * r->bpp; |
ef416fc2 | 366 | |
ed486911 | 367 | if (count > bytes) |
368 | count = bytes; | |
ef416fc2 | 369 | |
ed486911 | 370 | if (!cups_raster_read(r, temp, count)) |
371 | return (0); | |
ef416fc2 | 372 | |
ed486911 | 373 | temp += count; |
374 | bytes -= count; | |
375 | } | |
376 | else | |
377 | { | |
378 | /* | |
379 | * Repeat the next N bytes... | |
380 | */ | |
ef416fc2 | 381 | |
ed486911 | 382 | count = (byte + 1) * r->bpp; |
383 | if (count > bytes) | |
384 | count = bytes; | |
ef416fc2 | 385 | |
ed486911 | 386 | if (count < r->bpp) |
387 | break; | |
ef416fc2 | 388 | |
ed486911 | 389 | bytes -= count; |
ef416fc2 | 390 | |
ed486911 | 391 | if (!cups_raster_read(r, temp, r->bpp)) |
392 | return (0); | |
ef416fc2 | 393 | |
ed486911 | 394 | temp += r->bpp; |
395 | count -= r->bpp; | |
ef416fc2 | 396 | |
ed486911 | 397 | while (count > 0) |
398 | { | |
399 | memcpy(temp, temp - r->bpp, r->bpp); | |
ef416fc2 | 400 | temp += r->bpp; |
401 | count -= r->bpp; | |
ed486911 | 402 | } |
ef416fc2 | 403 | } |
404 | } | |
405 | ||
ed486911 | 406 | /* |
407 | * Swap bytes as needed... | |
408 | */ | |
409 | ||
f301802f | 410 | if ((r->header.cupsBitsPerColor == 16 || |
411 | r->header.cupsBitsPerPixel == 12 || | |
412 | r->header.cupsBitsPerPixel == 16) && | |
ed486911 | 413 | r->swapped) |
414 | cups_swap(ptr, bytes); | |
ef416fc2 | 415 | |
ed486911 | 416 | /* |
417 | * Update pointers... | |
418 | */ | |
ef416fc2 | 419 | |
ed486911 | 420 | if (remaining >= cupsBytesPerLine) |
ef416fc2 | 421 | { |
ed486911 | 422 | bytes = cupsBytesPerLine; |
ef416fc2 | 423 | r->pcurrent = r->pixels; |
424 | r->count --; | |
425 | r->remaining --; | |
426 | } | |
427 | else | |
428 | { | |
429 | bytes = remaining; | |
430 | r->pcurrent = r->pixels + bytes; | |
431 | } | |
432 | ||
ed486911 | 433 | /* |
434 | * Copy data as needed... | |
435 | */ | |
436 | ||
ef416fc2 | 437 | if (ptr != p) |
438 | memcpy(p, ptr, bytes); | |
439 | } | |
440 | else | |
441 | { | |
442 | /* | |
443 | * Copy fragment from buffer... | |
444 | */ | |
445 | ||
446 | if ((bytes = r->pend - r->pcurrent) > remaining) | |
447 | bytes = remaining; | |
448 | ||
449 | memcpy(p, r->pcurrent, bytes); | |
450 | r->pcurrent += bytes; | |
451 | ||
452 | if (r->pcurrent >= r->pend) | |
453 | { | |
454 | r->pcurrent = r->pixels; | |
455 | r->count --; | |
456 | r->remaining --; | |
457 | } | |
458 | } | |
459 | ||
460 | remaining -= bytes; | |
461 | p += bytes; | |
462 | } | |
463 | ||
464 | return (len); | |
465 | } | |
466 | ||
467 | ||
468 | /* | |
b423cd4c | 469 | * 'cupsRasterWriteHeader()' - Write a raster page header from a V1 page |
470 | * header structure. | |
ef416fc2 | 471 | */ |
472 | ||
473 | unsigned /* O - 1 on success, 0 on failure */ | |
474 | cupsRasterWriteHeader( | |
475 | cups_raster_t *r, /* I - Raster stream */ | |
476 | cups_page_header_t *h) /* I - Raster page header */ | |
477 | { | |
478 | if (r == NULL || r->mode != CUPS_RASTER_WRITE) | |
479 | return (0); | |
480 | ||
481 | /* | |
482 | * Make a copy of the header, and compute the number of raster | |
483 | * lines in the page image... | |
484 | */ | |
485 | ||
486 | memset(&(r->header), 0, sizeof(r->header)); | |
487 | memcpy(&(r->header), h, sizeof(cups_page_header_t)); | |
488 | ||
489 | cups_raster_update(r); | |
490 | ||
491 | /* | |
492 | * Write the raster header... | |
493 | */ | |
494 | ||
495 | return (cups_write(r->fd, (unsigned char *)&(r->header), sizeof(r->header)) | |
496 | > 0); | |
497 | } | |
498 | ||
499 | ||
500 | /* | |
b423cd4c | 501 | * 'cupsRasterWriteHeader2()' - Write a raster page header from a V2 page |
502 | * header structure. | |
ef416fc2 | 503 | * |
504 | * @since CUPS 1.2@ | |
505 | */ | |
506 | ||
507 | unsigned /* O - 1 on success, 0 on failure */ | |
508 | cupsRasterWriteHeader2( | |
509 | cups_raster_t *r, /* I - Raster stream */ | |
510 | cups_page_header2_t *h) /* I - Raster page header */ | |
511 | { | |
512 | if (r == NULL || r->mode != CUPS_RASTER_WRITE) | |
513 | return (0); | |
514 | ||
515 | /* | |
516 | * Make a copy of the header, and compute the number of raster | |
517 | * lines in the page image... | |
518 | */ | |
519 | ||
520 | memcpy(&(r->header), h, sizeof(cups_page_header2_t)); | |
521 | ||
522 | cups_raster_update(r); | |
523 | ||
524 | /* | |
525 | * Write the raster header... | |
526 | */ | |
527 | ||
528 | return (cups_write(r->fd, (unsigned char *)&(r->header), sizeof(r->header)) | |
529 | > 0); | |
530 | } | |
531 | ||
532 | ||
533 | /* | |
534 | * 'cupsRasterWritePixels()' - Write raster pixels. | |
535 | */ | |
536 | ||
537 | unsigned /* O - Number of bytes written */ | |
538 | cupsRasterWritePixels(cups_raster_t *r, /* I - Raster stream */ | |
539 | unsigned char *p, /* I - Bytes to write */ | |
540 | unsigned len)/* I - Number of bytes to write */ | |
541 | { | |
542 | int bytes; /* Bytes read */ | |
543 | unsigned remaining; /* Bytes remaining */ | |
544 | ||
545 | ||
f301802f | 546 | #ifdef DEBUG |
547 | fprintf(stderr, "cupsRasterWritePixels(r=%p, p=%p, len=%u), remaining=%u\n", | |
548 | r, p, len, r->remaining); | |
549 | #endif /* DEBUG */ | |
550 | ||
ef416fc2 | 551 | if (r == NULL || r->mode != CUPS_RASTER_WRITE || r->remaining == 0) |
552 | return (0); | |
553 | ||
ed486911 | 554 | if (!r->compressed) |
555 | { | |
556 | /* | |
557 | * Without compression, just write the raster data raw... | |
558 | */ | |
559 | ||
560 | r->remaining -= len / r->header.cupsBytesPerLine; | |
561 | ||
562 | return (cups_write(r->fd, p, len)); | |
563 | } | |
564 | ||
565 | /* | |
566 | * Otherwise, compress each line... | |
567 | */ | |
ef416fc2 | 568 | |
ed486911 | 569 | for (remaining = len; remaining > 0; remaining -= bytes, p += bytes) |
ef416fc2 | 570 | { |
571 | /* | |
572 | * Figure out the number of remaining bytes on the current line... | |
573 | */ | |
574 | ||
575 | if ((bytes = remaining) > (r->pend - r->pcurrent)) | |
576 | bytes = r->pend - r->pcurrent; | |
577 | ||
578 | if (r->count > 0) | |
579 | { | |
580 | /* | |
581 | * Check to see if this line is the same as the previous line... | |
582 | */ | |
583 | ||
584 | if (memcmp(p, r->pcurrent, bytes)) | |
585 | { | |
ed486911 | 586 | if (!cups_raster_write(r, r->pixels)) |
ef416fc2 | 587 | return (0); |
588 | ||
589 | r->count = 0; | |
590 | } | |
591 | else | |
592 | { | |
593 | /* | |
594 | * Mark more bytes as the same... | |
595 | */ | |
596 | ||
597 | r->pcurrent += bytes; | |
598 | ||
599 | if (r->pcurrent >= r->pend) | |
600 | { | |
601 | /* | |
602 | * Increase the repeat count... | |
603 | */ | |
604 | ||
605 | r->count ++; | |
606 | r->pcurrent = r->pixels; | |
607 | ||
608 | /* | |
609 | * Flush out this line if it is the last one... | |
610 | */ | |
611 | ||
612 | r->remaining --; | |
f301802f | 613 | |
ef416fc2 | 614 | if (r->remaining == 0) |
ed486911 | 615 | return (cups_raster_write(r, r->pixels)); |
ef416fc2 | 616 | else if (r->count == 256) |
617 | { | |
ed486911 | 618 | if (cups_raster_write(r, r->pixels) == 0) |
f301802f | 619 | return (0); |
620 | ||
ef416fc2 | 621 | r->count = 0; |
622 | } | |
623 | } | |
f301802f | 624 | |
625 | continue; | |
ef416fc2 | 626 | } |
627 | } | |
628 | ||
629 | if (r->count == 0) | |
630 | { | |
631 | /* | |
632 | * Copy the raster data to the buffer... | |
633 | */ | |
634 | ||
635 | memcpy(r->pcurrent, p, bytes); | |
636 | ||
637 | r->pcurrent += bytes; | |
638 | ||
639 | if (r->pcurrent >= r->pend) | |
640 | { | |
641 | /* | |
642 | * Increase the repeat count... | |
643 | */ | |
644 | ||
645 | r->count ++; | |
646 | r->pcurrent = r->pixels; | |
647 | ||
648 | /* | |
649 | * Flush out this line if it is the last one... | |
650 | */ | |
651 | ||
652 | r->remaining --; | |
f301802f | 653 | |
ef416fc2 | 654 | if (r->remaining == 0) |
ed486911 | 655 | return (cups_raster_write(r, r->pixels)); |
ef416fc2 | 656 | } |
657 | } | |
ef416fc2 | 658 | } |
659 | ||
660 | return (len); | |
661 | } | |
662 | ||
663 | ||
664 | /* | |
665 | * 'cups_raster_read_header()' - Read a raster page header. | |
666 | */ | |
667 | ||
668 | static unsigned /* O - 1 on success, 0 on fail */ | |
669 | cups_raster_read_header( | |
670 | cups_raster_t *r) /* I - Raster stream */ | |
671 | { | |
672 | int len; /* Number of words to swap */ | |
673 | union swap_s /* Swapping structure */ | |
674 | { | |
675 | unsigned char b[4]; | |
676 | unsigned v; | |
677 | } *s; | |
678 | ||
679 | ||
680 | if (r == NULL || r->mode != CUPS_RASTER_READ) | |
681 | return (0); | |
682 | ||
683 | /* | |
684 | * Get the length of the raster header... | |
685 | */ | |
686 | ||
687 | if (r->sync == CUPS_RASTER_SYNCv1 || r->sync == CUPS_RASTER_REVSYNCv1) | |
688 | len = sizeof(cups_page_header_t); | |
689 | else | |
690 | len = sizeof(cups_page_header2_t); | |
691 | ||
692 | /* | |
693 | * Read the header... | |
694 | */ | |
695 | ||
696 | memset(&(r->header), 0, sizeof(r->header)); | |
697 | ||
ed486911 | 698 | if (cups_raster_read(r, (unsigned char *)&(r->header), len) < len) |
ef416fc2 | 699 | return (0); |
700 | ||
701 | /* | |
702 | * Swap bytes as needed... | |
703 | */ | |
704 | ||
ed486911 | 705 | if (r->swapped) |
fa73b229 | 706 | for (len = 81, s = (union swap_s *)&(r->header.AdvanceDistance); |
ef416fc2 | 707 | len > 0; |
708 | len --, s ++) | |
709 | s->v = (((((s->b[3] << 8) | s->b[2]) << 8) | s->b[1]) << 8) | s->b[0]; | |
710 | ||
711 | /* | |
712 | * Update the header and row count... | |
713 | */ | |
714 | ||
715 | cups_raster_update(r); | |
716 | ||
717 | return (1); | |
718 | } | |
719 | ||
720 | ||
ed486911 | 721 | /* |
722 | * 'cups_raster_read()' - Read through the raster buffer. | |
723 | */ | |
724 | ||
725 | static int /* O - Number of bytes read */ | |
726 | cups_raster_read(cups_raster_t *r, /* I - Raster stream */ | |
727 | unsigned char *buf, /* I - Buffer */ | |
728 | int bytes) /* I - Number of bytes to read */ | |
729 | { | |
730 | int count, /* Number of bytes read */ | |
731 | remaining, /* Remaining bytes in buffer */ | |
732 | total; /* Total bytes read */ | |
733 | ||
734 | ||
735 | DEBUG_printf(("cups_raster_read(r=%p, buf=%p, bytes=%d)\n", r, buf, bytes)); | |
736 | ||
737 | if (!r->compressed) | |
738 | return (cups_read(r->fd, buf, bytes)); | |
739 | ||
740 | /* | |
741 | * Allocate a read buffer as needed... | |
742 | */ | |
743 | ||
744 | count = 2 * r->header.cupsBytesPerLine; | |
745 | ||
746 | if (count > r->bufsize) | |
747 | { | |
748 | int offset = r->bufptr - r->buffer; /* Offset to current start of buffer */ | |
749 | int end = r->bufend - r->buffer; /* Offset to current end of buffer */ | |
750 | unsigned char *rptr; /* Pointer in read buffer */ | |
751 | ||
752 | if (r->buffer) | |
753 | rptr = realloc(r->buffer, count); | |
754 | else | |
755 | rptr = malloc(count); | |
756 | ||
757 | if (!rptr) | |
758 | return (0); | |
759 | ||
760 | r->buffer = rptr; | |
761 | r->bufptr = rptr + offset; | |
762 | r->bufend = rptr + end; | |
763 | r->bufsize = count; | |
764 | } | |
765 | ||
766 | /* | |
767 | * Loop until we have read everything... | |
768 | */ | |
769 | ||
770 | for (total = 0, remaining = r->bufend - r->bufptr; | |
771 | total < bytes; | |
772 | total += count, buf += count) | |
773 | { | |
774 | count = bytes - total; | |
775 | ||
776 | DEBUG_printf(("count=%d, remaining=%d, buf=%p, bufptr=%p, bufend=%p...\n", | |
777 | count, remaining, buf, r->bufptr, r->bufend)); | |
778 | ||
779 | if (remaining == 0) | |
780 | { | |
781 | if (count < 16) | |
782 | { | |
783 | /* | |
784 | * Read into the raster buffer and then copy... | |
785 | */ | |
786 | ||
787 | remaining = cups_read(r->fd, r->buffer, r->bufsize); | |
788 | if (remaining <= 0) | |
789 | return (0); | |
790 | ||
791 | r->bufptr = r->buffer; | |
792 | r->bufend = r->buffer + remaining; | |
793 | } | |
794 | else | |
795 | { | |
796 | /* | |
797 | * Read directly into "buf"... | |
798 | */ | |
799 | ||
800 | count = cups_read(r->fd, buf, count); | |
801 | ||
802 | if (count <= 0) | |
803 | return (0); | |
804 | ||
805 | continue; | |
806 | } | |
807 | } | |
808 | ||
809 | /* | |
810 | * Copy bytes from raster buffer to "buf"... | |
811 | */ | |
812 | ||
813 | if (count > remaining) | |
814 | count = remaining; | |
815 | ||
816 | if (count == 1) | |
817 | { | |
818 | /* | |
819 | * Copy 1 byte... | |
820 | */ | |
821 | ||
822 | *buf = *(r->bufptr)++; | |
823 | remaining --; | |
824 | } | |
825 | else if (count < 128) | |
826 | { | |
827 | /* | |
828 | * Copy up to 127 bytes without using memcpy(); this is | |
829 | * faster because it avoids an extra function call and is | |
830 | * often further optimized by the compiler... | |
831 | */ | |
832 | ||
833 | unsigned char *bufptr; /* Temporary buffer pointer */ | |
834 | ||
835 | ||
836 | remaining -= count; | |
837 | ||
838 | for (bufptr = r->bufptr; count > 0; count --, total ++) | |
839 | *buf++ = *bufptr++; | |
840 | ||
841 | r->bufptr = bufptr; | |
842 | } | |
843 | else | |
844 | { | |
845 | /* | |
846 | * Use memcpy() for a large read... | |
847 | */ | |
848 | ||
849 | memcpy(buf, r->bufptr, count); | |
850 | r->bufptr += count; | |
851 | remaining -= count; | |
852 | } | |
853 | } | |
854 | ||
855 | return (total); | |
856 | } | |
857 | ||
858 | ||
ef416fc2 | 859 | /* |
860 | * 'cups_raster_update()' - Update the raster header and row count for the | |
861 | * current page. | |
862 | */ | |
863 | ||
864 | static void | |
865 | cups_raster_update(cups_raster_t *r) /* I - Raster stream */ | |
866 | { | |
f301802f | 867 | if (r->sync == CUPS_RASTER_SYNCv1 || r->sync == CUPS_RASTER_REVSYNCv1 || |
868 | r->header.cupsNumColors == 0) | |
ef416fc2 | 869 | { |
870 | /* | |
871 | * Set the "cupsNumColors" field according to the colorspace... | |
872 | */ | |
873 | ||
874 | switch (r->header.cupsColorSpace) | |
875 | { | |
876 | case CUPS_CSPACE_W : | |
877 | case CUPS_CSPACE_K : | |
878 | case CUPS_CSPACE_WHITE : | |
879 | case CUPS_CSPACE_GOLD : | |
880 | case CUPS_CSPACE_SILVER : | |
ef416fc2 | 881 | r->header.cupsNumColors = 1; |
882 | break; | |
883 | ||
ef416fc2 | 884 | case CUPS_CSPACE_RGB : |
885 | case CUPS_CSPACE_CMY : | |
886 | case CUPS_CSPACE_YMC : | |
887 | case CUPS_CSPACE_CIEXYZ : | |
888 | case CUPS_CSPACE_CIELab : | |
f301802f | 889 | case CUPS_CSPACE_ICC1 : |
890 | case CUPS_CSPACE_ICC2 : | |
ef416fc2 | 891 | case CUPS_CSPACE_ICC3 : |
f301802f | 892 | case CUPS_CSPACE_ICC4 : |
893 | case CUPS_CSPACE_ICC5 : | |
894 | case CUPS_CSPACE_ICC6 : | |
895 | case CUPS_CSPACE_ICC7 : | |
896 | case CUPS_CSPACE_ICC8 : | |
897 | case CUPS_CSPACE_ICC9 : | |
898 | case CUPS_CSPACE_ICCA : | |
899 | case CUPS_CSPACE_ICCB : | |
900 | case CUPS_CSPACE_ICCC : | |
901 | case CUPS_CSPACE_ICCD : | |
902 | case CUPS_CSPACE_ICCE : | |
903 | case CUPS_CSPACE_ICCF : | |
ef416fc2 | 904 | r->header.cupsNumColors = 3; |
905 | break; | |
906 | ||
907 | case CUPS_CSPACE_RGBA : | |
908 | case CUPS_CSPACE_RGBW : | |
909 | case CUPS_CSPACE_CMYK : | |
910 | case CUPS_CSPACE_YMCK : | |
911 | case CUPS_CSPACE_KCMY : | |
912 | case CUPS_CSPACE_GMCK : | |
913 | case CUPS_CSPACE_GMCS : | |
ef416fc2 | 914 | r->header.cupsNumColors = 4; |
915 | break; | |
916 | ||
917 | case CUPS_CSPACE_KCMYcm : | |
918 | if (r->header.cupsBitsPerPixel < 8) | |
919 | r->header.cupsNumColors = 6; | |
920 | else | |
921 | r->header.cupsNumColors = 4; | |
922 | break; | |
ef416fc2 | 923 | } |
924 | } | |
925 | ||
926 | /* | |
927 | * Set the number of bytes per pixel/color... | |
928 | */ | |
929 | ||
930 | if (r->header.cupsColorOrder == CUPS_ORDER_CHUNKED) | |
931 | r->bpp = (r->header.cupsBitsPerPixel + 7) / 8; | |
932 | else | |
933 | r->bpp = (r->header.cupsBitsPerColor + 7) / 8; | |
934 | ||
935 | /* | |
936 | * Set the number of remaining rows... | |
937 | */ | |
938 | ||
939 | if (r->header.cupsColorOrder == CUPS_ORDER_PLANAR) | |
940 | r->remaining = r->header.cupsHeight * r->header.cupsNumColors; | |
941 | else | |
942 | r->remaining = r->header.cupsHeight; | |
943 | ||
944 | /* | |
ed486911 | 945 | * Allocate the compression buffer... |
ef416fc2 | 946 | */ |
947 | ||
ed486911 | 948 | if (r->compressed) |
949 | { | |
950 | if (r->pixels != NULL) | |
951 | free(r->pixels); | |
ef416fc2 | 952 | |
ed486911 | 953 | r->pixels = calloc(r->header.cupsBytesPerLine, 1); |
954 | r->pcurrent = r->pixels; | |
955 | r->pend = r->pixels + r->header.cupsBytesPerLine; | |
956 | r->count = 0; | |
957 | } | |
ef416fc2 | 958 | } |
959 | ||
960 | ||
961 | /* | |
ed486911 | 962 | * 'cups_raster_write()' - Write a row of compressed raster data... |
ef416fc2 | 963 | */ |
964 | ||
965 | static int /* O - Number of bytes written */ | |
ed486911 | 966 | cups_raster_write( |
967 | cups_raster_t *r, /* I - Raster stream */ | |
968 | const unsigned char *pixels) /* I - Pixel data to write */ | |
ef416fc2 | 969 | { |
ed486911 | 970 | const unsigned char *start, /* Start of sequence */ |
971 | *ptr, /* Current pointer in sequence */ | |
972 | *pend, /* End of raster buffer */ | |
973 | *plast; /* Pointer to last pixel */ | |
974 | unsigned char *wptr; /* Pointer into write buffer */ | |
975 | int bpp, /* Bytes per pixel */ | |
976 | count, /* Count */ | |
977 | maxrun; /* Maximum run of 128 * bpp */ | |
ef416fc2 | 978 | |
979 | ||
f301802f | 980 | #ifdef DEBUG |
ed486911 | 981 | fprintf(stderr, "cups_raster_write(r=%p, pixels=%p)\n", r, pixels); |
f301802f | 982 | #endif /* DEBUG */ |
983 | ||
ef416fc2 | 984 | /* |
ed486911 | 985 | * Allocate a write buffer as needed... |
ef416fc2 | 986 | */ |
987 | ||
ed486911 | 988 | count = r->header.cupsBytesPerLine * 2; |
989 | if (count > r->bufsize) | |
f301802f | 990 | { |
ed486911 | 991 | if (r->buffer) |
992 | wptr = realloc(r->buffer, count); | |
993 | else | |
994 | wptr = malloc(count); | |
f301802f | 995 | |
ed486911 | 996 | if (!wptr) |
997 | return (-1); | |
998 | ||
999 | r->buffer = wptr; | |
1000 | r->bufsize = count; | |
f301802f | 1001 | } |
ef416fc2 | 1002 | |
ed486911 | 1003 | /* |
1004 | * Write the row repeat count... | |
1005 | */ | |
1006 | ||
1007 | bpp = r->bpp; | |
1008 | pend = pixels + r->header.cupsBytesPerLine; | |
1009 | plast = pend - bpp; | |
1010 | wptr = r->buffer; | |
1011 | *wptr++ = r->count - 1; | |
1012 | maxrun = 128 * bpp; | |
1013 | ||
ef416fc2 | 1014 | /* |
1015 | * Write using a modified TIFF "packbits" compression... | |
1016 | */ | |
1017 | ||
ed486911 | 1018 | for (ptr = pixels; ptr < pend;) |
ef416fc2 | 1019 | { |
1020 | start = ptr; | |
ed486911 | 1021 | ptr += bpp; |
ef416fc2 | 1022 | |
ed486911 | 1023 | if (ptr == pend) |
ef416fc2 | 1024 | { |
1025 | /* | |
1026 | * Encode a single pixel at the end... | |
1027 | */ | |
1028 | ||
ed486911 | 1029 | *wptr++ = 0; |
1030 | for (count = bpp; count > 0; count --) | |
1031 | *wptr++ = *start++; | |
ef416fc2 | 1032 | } |
ed486911 | 1033 | else if (!memcmp(start, ptr, bpp)) |
ef416fc2 | 1034 | { |
1035 | /* | |
1036 | * Encode a sequence of repeating pixels... | |
1037 | */ | |
1038 | ||
ed486911 | 1039 | for (count = 2; count < 128 && ptr < plast; count ++, ptr += bpp) |
1040 | if (memcmp(ptr, ptr + bpp, bpp)) | |
ef416fc2 | 1041 | break; |
1042 | ||
ed486911 | 1043 | *wptr++ = count - 1; |
1044 | for (count = bpp; count > 0; count --) | |
1045 | *wptr++ = *ptr++; | |
ef416fc2 | 1046 | } |
1047 | else | |
1048 | { | |
1049 | /* | |
1050 | * Encode a sequence of non-repeating pixels... | |
1051 | */ | |
1052 | ||
ed486911 | 1053 | for (count = 1; count < 127 && ptr < plast; count ++, ptr += bpp) |
1054 | if (!memcmp(ptr, ptr + bpp, bpp)) | |
ef416fc2 | 1055 | break; |
1056 | ||
ed486911 | 1057 | if (ptr >= plast && count < 128) |
ef416fc2 | 1058 | { |
1059 | count ++; | |
ed486911 | 1060 | ptr += bpp; |
ef416fc2 | 1061 | } |
1062 | ||
ed486911 | 1063 | *wptr++ = 257 - count; |
f301802f | 1064 | |
ed486911 | 1065 | count *= bpp; |
1066 | memcpy(wptr, start, count); | |
1067 | wptr += count; | |
ef416fc2 | 1068 | } |
1069 | } | |
1070 | ||
ed486911 | 1071 | return (cups_write(r->fd, r->buffer, wptr - r->buffer)); |
ef416fc2 | 1072 | } |
1073 | ||
1074 | ||
1075 | /* | |
1076 | * 'cups_read()' - Read bytes from a file. | |
1077 | */ | |
1078 | ||
1079 | static int /* O - Bytes read or -1 */ | |
1080 | cups_read(int fd, /* I - File descriptor */ | |
1081 | unsigned char *buf, /* I - Buffer for read */ | |
1082 | int bytes) /* I - Number of bytes to read */ | |
1083 | { | |
1084 | int count, /* Number of bytes read */ | |
1085 | total; /* Total bytes read */ | |
1086 | ||
1087 | ||
1088 | for (total = 0; total < bytes; total += count, buf += count) | |
1089 | { | |
1090 | count = read(fd, buf, bytes - total); | |
1091 | ||
1092 | if (count == 0) | |
1093 | return (0); | |
1094 | else if (count < 0) | |
1095 | { | |
1096 | if (errno == EINTR) | |
1097 | count = 0; | |
1098 | else | |
1099 | return (-1); | |
1100 | } | |
1101 | } | |
1102 | ||
1103 | return (total); | |
1104 | } | |
1105 | ||
1106 | ||
ed486911 | 1107 | /* |
1108 | * 'cups_swap()' - Swap bytes in raster data... | |
1109 | */ | |
1110 | ||
1111 | static void | |
1112 | cups_swap(unsigned char *buf, /* I - Buffer to swap */ | |
1113 | int bytes) /* I - Number of bytes to swap */ | |
1114 | { | |
1115 | unsigned char even, odd; /* Temporary variables */ | |
1116 | ||
1117 | ||
1118 | bytes /= 2; | |
1119 | ||
1120 | while (bytes > 0) | |
1121 | { | |
1122 | even = buf[0]; | |
1123 | odd = buf[1]; | |
1124 | buf[0] = odd; | |
1125 | buf[1] = even; | |
1126 | ||
1127 | buf += 2; | |
1128 | bytes --; | |
1129 | } | |
1130 | } | |
1131 | ||
1132 | ||
ef416fc2 | 1133 | /* |
1134 | * 'cups_write()' - Write bytes to a file. | |
1135 | */ | |
1136 | ||
1137 | static int /* O - Bytes written or -1 */ | |
1138 | cups_write(int fd, /* I - File descriptor */ | |
1139 | const unsigned char *buf, /* I - Bytes to write */ | |
1140 | int bytes) /* I - Number of bytes to write */ | |
1141 | { | |
1142 | int count, /* Number of bytes written */ | |
1143 | total; /* Total bytes written */ | |
1144 | ||
1145 | ||
1146 | for (total = 0; total < bytes; total += count, buf += count) | |
1147 | { | |
1148 | count = write(fd, buf, bytes - total); | |
1149 | ||
1150 | if (count < 0) | |
1151 | { | |
1152 | if (errno == EINTR) | |
1153 | count = 0; | |
1154 | else | |
1155 | return (-1); | |
1156 | } | |
1157 | } | |
1158 | ||
1159 | return (total); | |
1160 | } | |
1161 | ||
1162 | ||
1163 | /* | |
c07d5b2d | 1164 | * End of "$Id: raster.c 181 2006-06-22 20:01:18Z jlovell $". |
ef416fc2 | 1165 | */ |