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9c72faab | 1 | //======================================================================== |
2 | // | |
3 | // Stream.cc | |
4 | // | |
5 | // Copyright 1996 Derek B. Noonburg | |
6 | // | |
7 | //======================================================================== | |
8 | ||
9 | #ifdef __GNUC__ | |
10 | #pragma implementation | |
11 | #endif | |
12 | ||
13 | #include <stdio.h> | |
14 | #include <stdlib.h> | |
15 | #include <stddef.h> | |
16 | #ifndef WIN32 | |
17 | #include <unistd.h> | |
18 | #endif | |
19 | #include <string.h> | |
20 | #include <ctype.h> | |
21 | #include "gmem.h" | |
52118ca3 | 22 | #include "gfile.h" |
9c72faab | 23 | #include "config.h" |
24 | #include "Error.h" | |
25 | #include "Object.h" | |
52118ca3 | 26 | #ifndef NO_DECRYPTION |
27 | #include "Decrypt.h" | |
28 | #endif | |
9c72faab | 29 | #include "Stream.h" |
30 | #include "Stream-CCITT.h" | |
31 | ||
9c72faab | 32 | #ifdef __DJGPP__ |
33 | static GBool setDJSYSFLAGS = gFalse; | |
34 | #endif | |
35 | ||
36 | #ifdef VMS | |
37 | #if (__VMS_VER < 70000000) | |
38 | extern "C" int unlink(char *filename); | |
39 | #endif | |
40 | #ifdef __GNUC__ | |
41 | #define SEEK_SET 0 | |
42 | #define SEEK_CUR 1 | |
43 | #define SEEK_END 2 | |
44 | #endif | |
45 | #endif | |
46 | ||
52118ca3 | 47 | #ifdef MACOS |
48 | #include "StuffItEngineLib.h" | |
49 | #endif | |
9c72faab | 50 | |
51 | //------------------------------------------------------------------------ | |
52 | // Stream (base class) | |
53 | //------------------------------------------------------------------------ | |
54 | ||
55 | Stream::Stream() { | |
56 | ref = 1; | |
57 | } | |
58 | ||
59 | Stream::~Stream() { | |
60 | } | |
61 | ||
b5cb0608 | 62 | void Stream::close() { |
63 | } | |
64 | ||
9c72faab | 65 | int Stream::getRawChar() { |
66 | error(-1, "Internal: called getRawChar() on non-predictor stream"); | |
67 | return EOF; | |
68 | } | |
69 | ||
70 | char *Stream::getLine(char *buf, int size) { | |
71 | int i; | |
72 | int c; | |
73 | ||
74 | if (lookChar() == EOF) | |
75 | return NULL; | |
76 | for (i = 0; i < size - 1; ++i) { | |
77 | c = getChar(); | |
78 | if (c == EOF || c == '\n') | |
79 | break; | |
80 | if (c == '\r') { | |
81 | if ((c = lookChar()) == '\n') | |
82 | getChar(); | |
83 | break; | |
84 | } | |
85 | buf[i] = c; | |
86 | } | |
87 | buf[i] = '\0'; | |
88 | return buf; | |
89 | } | |
90 | ||
b5cb0608 | 91 | GString *Stream::getPSFilter(const char *indent) { |
92 | (void)indent; | |
93 | ||
9c72faab | 94 | return new GString(); |
95 | } | |
96 | ||
97 | Stream *Stream::addFilters(Object *dict) { | |
98 | Object obj, obj2; | |
99 | Object params, params2; | |
100 | Stream *str; | |
101 | int i; | |
102 | ||
103 | str = this; | |
104 | dict->dictLookup("Filter", &obj); | |
105 | if (obj.isNull()) { | |
106 | obj.free(); | |
107 | dict->dictLookup("F", &obj); | |
108 | } | |
109 | dict->dictLookup("DecodeParms", ¶ms); | |
110 | if (params.isNull()) { | |
111 | params.free(); | |
112 | dict->dictLookup("DP", ¶ms); | |
113 | } | |
114 | if (obj.isName()) { | |
115 | str = makeFilter(obj.getName(), str, ¶ms); | |
116 | } else if (obj.isArray()) { | |
117 | for (i = 0; i < obj.arrayGetLength(); ++i) { | |
118 | obj.arrayGet(i, &obj2); | |
119 | if (params.isArray()) | |
120 | params.arrayGet(i, ¶ms2); | |
121 | else | |
122 | params2.initNull(); | |
123 | if (obj2.isName()) { | |
124 | str = makeFilter(obj2.getName(), str, ¶ms2); | |
125 | } else { | |
126 | error(getPos(), "Bad filter name"); | |
127 | str = new EOFStream(str); | |
128 | } | |
129 | obj2.free(); | |
130 | params2.free(); | |
131 | } | |
132 | } else if (!obj.isNull()) { | |
133 | error(getPos(), "Bad 'Filter' attribute in stream"); | |
134 | } | |
135 | obj.free(); | |
136 | params.free(); | |
137 | ||
138 | return str; | |
139 | } | |
140 | ||
b5cb0608 | 141 | Stream *Stream::makeFilter(const char *name, Stream *str, Object *params) { |
9c72faab | 142 | int pred; // parameters |
143 | int colors; | |
144 | int bits; | |
145 | int early; | |
146 | int encoding; | |
147 | GBool endOfLine, byteAlign, endOfBlock, black; | |
148 | int columns, rows; | |
149 | Object obj; | |
150 | ||
151 | if (!strcmp(name, "ASCIIHexDecode") || !strcmp(name, "AHx")) { | |
152 | str = new ASCIIHexStream(str); | |
153 | } else if (!strcmp(name, "ASCII85Decode") || !strcmp(name, "A85")) { | |
154 | str = new ASCII85Stream(str); | |
155 | } else if (!strcmp(name, "LZWDecode") || !strcmp(name, "LZW")) { | |
156 | pred = 1; | |
157 | columns = 1; | |
158 | colors = 1; | |
159 | bits = 8; | |
160 | early = 1; | |
161 | if (params->isDict()) { | |
162 | params->dictLookup("Predictor", &obj); | |
163 | if (obj.isInt()) | |
164 | pred = obj.getInt(); | |
165 | obj.free(); | |
166 | params->dictLookup("Columns", &obj); | |
167 | if (obj.isInt()) | |
168 | columns = obj.getInt(); | |
169 | obj.free(); | |
170 | params->dictLookup("Colors", &obj); | |
171 | if (obj.isInt()) | |
172 | colors = obj.getInt(); | |
173 | obj.free(); | |
174 | params->dictLookup("BitsPerComponent", &obj); | |
175 | if (obj.isInt()) | |
176 | bits = obj.getInt(); | |
177 | obj.free(); | |
178 | params->dictLookup("EarlyChange", &obj); | |
179 | if (obj.isInt()) | |
180 | early = obj.getInt(); | |
181 | obj.free(); | |
182 | } | |
183 | str = new LZWStream(str, pred, columns, colors, bits, early); | |
184 | } else if (!strcmp(name, "RunLengthDecode") || !strcmp(name, "RL")) { | |
185 | str = new RunLengthStream(str); | |
186 | } else if (!strcmp(name, "CCITTFaxDecode") || !strcmp(name, "CCF")) { | |
187 | encoding = 0; | |
188 | endOfLine = gFalse; | |
189 | byteAlign = gFalse; | |
190 | columns = 1728; | |
191 | rows = 0; | |
192 | endOfBlock = gTrue; | |
193 | black = gFalse; | |
194 | if (params->isDict()) { | |
195 | params->dictLookup("K", &obj); | |
196 | if (obj.isInt()) { | |
197 | encoding = obj.getInt(); | |
198 | } | |
199 | obj.free(); | |
200 | params->dictLookup("EndOfLine", &obj); | |
201 | if (obj.isBool()) { | |
202 | endOfLine = obj.getBool(); | |
203 | } | |
204 | obj.free(); | |
205 | params->dictLookup("EncodedByteAlign", &obj); | |
206 | if (obj.isBool()) { | |
207 | byteAlign = obj.getBool(); | |
208 | } | |
209 | obj.free(); | |
210 | params->dictLookup("Columns", &obj); | |
211 | if (obj.isInt()) { | |
212 | columns = obj.getInt(); | |
213 | } | |
214 | obj.free(); | |
215 | params->dictLookup("Rows", &obj); | |
216 | if (obj.isInt()) { | |
217 | rows = obj.getInt(); | |
218 | } | |
219 | obj.free(); | |
220 | params->dictLookup("EndOfBlock", &obj); | |
221 | if (obj.isBool()) { | |
222 | endOfBlock = obj.getBool(); | |
223 | } | |
224 | obj.free(); | |
225 | params->dictLookup("BlackIs1", &obj); | |
226 | if (obj.isBool()) { | |
227 | black = obj.getBool(); | |
228 | } | |
229 | obj.free(); | |
230 | } | |
231 | str = new CCITTFaxStream(str, encoding, endOfLine, byteAlign, | |
232 | columns, rows, endOfBlock, black); | |
233 | } else if (!strcmp(name, "DCTDecode") || !strcmp(name, "DCT")) { | |
234 | str = new DCTStream(str); | |
235 | } else if (!strcmp(name, "FlateDecode") || !strcmp(name, "Fl")) { | |
236 | pred = 1; | |
237 | columns = 1; | |
238 | colors = 1; | |
239 | bits = 8; | |
240 | if (params->isDict()) { | |
241 | params->dictLookup("Predictor", &obj); | |
242 | if (obj.isInt()) | |
243 | pred = obj.getInt(); | |
244 | obj.free(); | |
245 | params->dictLookup("Columns", &obj); | |
246 | if (obj.isInt()) | |
247 | columns = obj.getInt(); | |
248 | obj.free(); | |
249 | params->dictLookup("Colors", &obj); | |
250 | if (obj.isInt()) | |
251 | colors = obj.getInt(); | |
252 | obj.free(); | |
253 | params->dictLookup("BitsPerComponent", &obj); | |
254 | if (obj.isInt()) | |
255 | bits = obj.getInt(); | |
256 | obj.free(); | |
257 | } | |
258 | str = new FlateStream(str, pred, columns, colors, bits); | |
259 | } else { | |
260 | error(getPos(), "Unknown filter '%s'", name); | |
261 | str = new EOFStream(str); | |
262 | } | |
263 | return str; | |
264 | } | |
265 | ||
52118ca3 | 266 | //------------------------------------------------------------------------ |
267 | // BaseStream | |
268 | //------------------------------------------------------------------------ | |
269 | ||
b5cb0608 | 270 | BaseStream::BaseStream(Object *ndict) { |
271 | dict = *ndict; | |
52118ca3 | 272 | #ifndef NO_DECRYPTION |
273 | decrypt = NULL; | |
274 | #endif | |
275 | } | |
276 | ||
277 | BaseStream::~BaseStream() { | |
278 | dict.free(); | |
279 | #ifndef NO_DECRYPTION | |
280 | if (decrypt) | |
281 | delete decrypt; | |
282 | #endif | |
283 | } | |
284 | ||
285 | #ifndef NO_DECRYPTION | |
286 | void BaseStream::doDecryption(Guchar *fileKey, int objNum, int objGen) { | |
287 | decrypt = new Decrypt(fileKey, objNum, objGen); | |
288 | } | |
289 | #endif | |
290 | ||
291 | //------------------------------------------------------------------------ | |
292 | // FilterStream | |
293 | //------------------------------------------------------------------------ | |
294 | ||
b5cb0608 | 295 | FilterStream::FilterStream(Stream *nstr) { |
296 | str = nstr; | |
52118ca3 | 297 | } |
298 | ||
299 | FilterStream::~FilterStream() { | |
300 | } | |
301 | ||
b5cb0608 | 302 | void FilterStream::close() { |
303 | str->close(); | |
304 | } | |
305 | ||
52118ca3 | 306 | void FilterStream::setPos(int pos) { |
b5cb0608 | 307 | (void)pos; |
308 | ||
52118ca3 | 309 | error(-1, "Internal: called setPos() on FilterStream"); |
310 | } | |
311 | ||
9c72faab | 312 | //------------------------------------------------------------------------ |
313 | // ImageStream | |
314 | //------------------------------------------------------------------------ | |
315 | ||
b5cb0608 | 316 | ImageStream::ImageStream(Stream *nstr, int nwidth, int nnComps, int nnBits) { |
9c72faab | 317 | int imgLineSize; |
318 | ||
b5cb0608 | 319 | str = nstr; |
320 | width = nwidth; | |
321 | nComps = nnComps; | |
322 | nBits = nnBits; | |
9c72faab | 323 | |
324 | nVals = width * nComps; | |
325 | if (nBits == 1) { | |
326 | imgLineSize = (nVals + 7) & ~7; | |
327 | } else { | |
328 | imgLineSize = nVals; | |
329 | } | |
330 | imgLine = (Guchar *)gmalloc(imgLineSize * sizeof(Guchar)); | |
331 | imgIdx = nVals; | |
332 | } | |
333 | ||
334 | ImageStream::~ImageStream() { | |
335 | gfree(imgLine); | |
336 | } | |
337 | ||
338 | void ImageStream::reset() { | |
339 | str->reset(); | |
340 | } | |
341 | ||
342 | GBool ImageStream::getPixel(Guchar *pix) { | |
343 | Gulong buf, bitMask; | |
344 | int bits; | |
345 | int c; | |
346 | int i; | |
347 | ||
348 | if (imgIdx >= nVals) { | |
349 | ||
350 | // read one line of image pixels | |
351 | if (nBits == 1) { | |
352 | for (i = 0; i < nVals; i += 8) { | |
353 | c = str->getChar(); | |
354 | imgLine[i+0] = (Guchar)((c >> 7) & 1); | |
355 | imgLine[i+1] = (Guchar)((c >> 6) & 1); | |
356 | imgLine[i+2] = (Guchar)((c >> 5) & 1); | |
357 | imgLine[i+3] = (Guchar)((c >> 4) & 1); | |
358 | imgLine[i+4] = (Guchar)((c >> 3) & 1); | |
359 | imgLine[i+5] = (Guchar)((c >> 2) & 1); | |
360 | imgLine[i+6] = (Guchar)((c >> 1) & 1); | |
361 | imgLine[i+7] = (Guchar)(c & 1); | |
362 | } | |
363 | } else if (nBits == 8) { | |
364 | for (i = 0; i < nVals; ++i) { | |
365 | imgLine[i] = str->getChar(); | |
366 | } | |
367 | } else { | |
368 | bitMask = (1 << nBits) - 1; | |
369 | buf = 0; | |
370 | bits = 0; | |
371 | for (i = 0; i < nVals; ++i) { | |
372 | if (bits < nBits) { | |
373 | buf = (buf << 8) | (str->getChar() & 0xff); | |
374 | bits += 8; | |
375 | } | |
376 | imgLine[i] = (Guchar)((buf >> (bits - nBits)) & bitMask); | |
377 | bits -= nBits; | |
378 | } | |
379 | } | |
380 | ||
381 | // reset to start of line | |
382 | imgIdx = 0; | |
383 | } | |
384 | ||
385 | for (i = 0; i < nComps; ++i) | |
386 | pix[i] = imgLine[imgIdx++]; | |
387 | return gTrue; | |
388 | } | |
389 | ||
390 | void ImageStream::skipLine() { | |
391 | int n, i; | |
392 | ||
393 | n = (nVals * nBits + 7) >> 3; | |
394 | for (i = 0; i < n; ++i) { | |
395 | str->getChar(); | |
396 | } | |
397 | } | |
398 | ||
399 | //------------------------------------------------------------------------ | |
400 | // StreamPredictor | |
401 | //------------------------------------------------------------------------ | |
402 | ||
b5cb0608 | 403 | StreamPredictor::StreamPredictor(Stream *nstr, int npredictor, |
404 | int nwidth, int nnComps, int nnBits) { | |
405 | str = nstr; | |
406 | predictor = npredictor; | |
407 | width = nwidth; | |
408 | nComps = nnComps; | |
409 | nBits = nnBits; | |
9c72faab | 410 | |
411 | nVals = width * nComps; | |
412 | pixBytes = (nComps * nBits + 7) >> 3; | |
413 | rowBytes = ((nVals * nBits + 7) >> 3) + pixBytes; | |
414 | predLine = (Guchar *)gmalloc(rowBytes); | |
415 | memset(predLine, 0, rowBytes); | |
416 | predIdx = rowBytes; | |
417 | } | |
418 | ||
419 | StreamPredictor::~StreamPredictor() { | |
420 | gfree(predLine); | |
421 | } | |
422 | ||
423 | int StreamPredictor::lookChar() { | |
424 | if (predIdx >= rowBytes) { | |
425 | if (!getNextLine()) { | |
426 | return EOF; | |
427 | } | |
428 | } | |
429 | return predLine[predIdx]; | |
430 | } | |
431 | ||
432 | int StreamPredictor::getChar() { | |
433 | if (predIdx >= rowBytes) { | |
434 | if (!getNextLine()) { | |
435 | return EOF; | |
436 | } | |
437 | } | |
438 | return predLine[predIdx++]; | |
439 | } | |
440 | ||
441 | GBool StreamPredictor::getNextLine() { | |
442 | int curPred; | |
443 | Guchar upLeftBuf[4]; | |
444 | int left, up, upLeft, p, pa, pb, pc; | |
445 | int c; | |
446 | Gulong inBuf, outBuf, bitMask; | |
447 | int inBits, outBits; | |
448 | int i, j, k; | |
449 | ||
450 | // get PNG optimum predictor number | |
451 | if (predictor == 15) { | |
452 | if ((curPred = str->getRawChar()) == EOF) { | |
453 | return gFalse; | |
454 | } | |
455 | curPred += 10; | |
456 | } else { | |
457 | curPred = predictor; | |
458 | } | |
459 | ||
460 | // read the raw line, apply PNG (byte) predictor | |
461 | upLeftBuf[0] = upLeftBuf[1] = upLeftBuf[2] = upLeftBuf[3] = 0; | |
462 | for (i = pixBytes; i < rowBytes; ++i) { | |
463 | upLeftBuf[3] = upLeftBuf[2]; | |
464 | upLeftBuf[2] = upLeftBuf[1]; | |
465 | upLeftBuf[1] = upLeftBuf[0]; | |
466 | upLeftBuf[0] = predLine[i]; | |
467 | if ((c = str->getRawChar()) == EOF) { | |
468 | break; | |
469 | } | |
470 | switch (curPred) { | |
471 | case 11: // PNG sub | |
472 | predLine[i] = predLine[i - pixBytes] + (Guchar)c; | |
473 | break; | |
474 | case 12: // PNG up | |
475 | predLine[i] = predLine[i] + (Guchar)c; | |
476 | break; | |
477 | case 13: // PNG average | |
478 | predLine[i] = ((predLine[i - pixBytes] + predLine[i]) >> 1) + | |
479 | (Guchar)c; | |
480 | break; | |
481 | case 14: // PNG Paeth | |
482 | left = predLine[i - pixBytes]; | |
483 | up = predLine[i]; | |
484 | upLeft = upLeftBuf[pixBytes]; | |
485 | p = left + up - upLeft; | |
486 | if ((pa = p - left) < 0) | |
487 | pa = -pa; | |
488 | if ((pb = p - up) < 0) | |
489 | pb = -pb; | |
490 | if ((pc = p - upLeft) < 0) | |
491 | pc = -pc; | |
492 | if (pa <= pb && pa <= pc) | |
493 | predLine[i] = pa + (Guchar)c; | |
494 | else if (pb <= pc) | |
495 | predLine[i] = pb + (Guchar)c; | |
496 | else | |
497 | predLine[i] = pc + (Guchar)c; | |
498 | break; | |
499 | case 10: // PNG none | |
500 | default: // no predictor or TIFF predictor | |
501 | predLine[i] = (Guchar)c; | |
502 | break; | |
503 | } | |
504 | } | |
505 | ||
506 | // apply TIFF (component) predictor | |
507 | //~ this is completely untested | |
508 | if (predictor == 2) { | |
509 | if (nBits == 1) { | |
510 | inBuf = predLine[pixBytes - 1]; | |
511 | for (i = pixBytes; i < rowBytes; i += 8) { | |
512 | // 1-bit add is just xor | |
513 | inBuf = (inBuf << 8) | predLine[i]; | |
514 | predLine[i] ^= inBuf >> nComps; | |
515 | } | |
516 | } else if (nBits == 8) { | |
517 | for (i = pixBytes; i < rowBytes; ++i) { | |
518 | predLine[i] += predLine[i - nComps]; | |
519 | } | |
520 | } else { | |
521 | upLeftBuf[0] = upLeftBuf[1] = upLeftBuf[2] = upLeftBuf[3] = 0; | |
522 | bitMask = (1 << nBits) - 1; | |
523 | inBuf = outBuf = 0; | |
524 | inBits = outBits = 0; | |
525 | j = k = pixBytes; | |
526 | for (i = 0; i < nVals; ++i) { | |
527 | if (inBits < nBits) { | |
528 | inBuf = (inBuf << 8) | (predLine[j++] & 0xff); | |
529 | inBits += 8; | |
530 | } | |
531 | upLeftBuf[3] = upLeftBuf[2]; | |
532 | upLeftBuf[2] = upLeftBuf[1]; | |
533 | upLeftBuf[1] = upLeftBuf[0]; | |
534 | upLeftBuf[0] = (upLeftBuf[nComps] + | |
535 | (inBuf >> (inBits - nBits))) & bitMask; | |
536 | outBuf = (outBuf << nBits) | upLeftBuf[0]; | |
537 | inBits -= nBits; | |
538 | outBits += nBits; | |
539 | if (outBits > 8) { | |
540 | predLine[k++] = (Guchar)(outBuf >> (outBits - 8)); | |
541 | } | |
542 | } | |
543 | if (outBits > 0) { | |
544 | predLine[k++] = (Guchar)(outBuf << (8 - outBits)); | |
545 | } | |
546 | } | |
547 | } | |
548 | ||
549 | // reset to start of line | |
550 | predIdx = pixBytes; | |
551 | ||
552 | return gTrue; | |
553 | } | |
554 | ||
555 | //------------------------------------------------------------------------ | |
556 | // FileStream | |
557 | //------------------------------------------------------------------------ | |
558 | ||
b5cb0608 | 559 | FileStream::FileStream(FILE *nf, int nstart, int nlength, Object *dict): |
52118ca3 | 560 | BaseStream(dict) { |
b5cb0608 | 561 | f = nf; |
562 | start = nstart; | |
563 | length = nlength; | |
9c72faab | 564 | bufPtr = bufEnd = buf; |
565 | bufPos = start; | |
566 | savePos = -1; | |
9c72faab | 567 | } |
568 | ||
569 | FileStream::~FileStream() { | |
b5cb0608 | 570 | close(); |
52118ca3 | 571 | } |
572 | ||
b5cb0608 | 573 | Stream *FileStream::makeSubStream(int nstart, int nlength, Object *ndict) { |
574 | return new FileStream(f, nstart, nlength, ndict); | |
9c72faab | 575 | } |
576 | ||
577 | void FileStream::reset() { | |
578 | savePos = (int)ftell(f); | |
579 | fseek(f, start, SEEK_SET); | |
580 | bufPtr = bufEnd = buf; | |
581 | bufPos = start; | |
52118ca3 | 582 | #ifndef NO_DECRYPTION |
583 | if (decrypt) | |
584 | decrypt->reset(); | |
585 | #endif | |
9c72faab | 586 | } |
587 | ||
b5cb0608 | 588 | void FileStream::close() { |
589 | if (savePos >= 0) { | |
590 | fseek(f, savePos, SEEK_SET); | |
591 | savePos = -1; | |
592 | } | |
593 | } | |
594 | ||
9c72faab | 595 | GBool FileStream::fillBuf() { |
596 | int n; | |
52118ca3 | 597 | #ifndef NO_DECRYPTION |
598 | char *p; | |
599 | #endif | |
9c72faab | 600 | |
601 | bufPos += bufEnd - buf; | |
602 | bufPtr = bufEnd = buf; | |
b5cb0608 | 603 | if (length >= 0 && bufPos >= start + length) { |
9c72faab | 604 | return gFalse; |
b5cb0608 | 605 | } |
606 | if (length >= 0 && bufPos + fileStreamBufSize > start + length) { | |
9c72faab | 607 | n = start + length - bufPos; |
b5cb0608 | 608 | } else { |
609 | n = fileStreamBufSize; | |
610 | } | |
9c72faab | 611 | n = fread(buf, 1, n, f); |
612 | bufEnd = buf + n; | |
b5cb0608 | 613 | if (bufPtr >= bufEnd) { |
9c72faab | 614 | return gFalse; |
b5cb0608 | 615 | } |
52118ca3 | 616 | #ifndef NO_DECRYPTION |
617 | if (decrypt) { | |
b5cb0608 | 618 | for (p = buf; p < bufEnd; ++p) { |
52118ca3 | 619 | *p = (char)decrypt->decryptByte((Guchar)*p); |
b5cb0608 | 620 | } |
52118ca3 | 621 | } |
622 | #endif | |
9c72faab | 623 | return gTrue; |
624 | } | |
625 | ||
626 | void FileStream::setPos(int pos1) { | |
627 | long size; | |
628 | ||
629 | if (pos1 >= 0) { | |
630 | fseek(f, pos1, SEEK_SET); | |
631 | bufPos = pos1; | |
632 | } else { | |
633 | fseek(f, 0, SEEK_END); | |
634 | size = ftell(f); | |
635 | if (pos1 < -size) | |
636 | pos1 = (int)(-size); | |
637 | fseek(f, pos1, SEEK_END); | |
638 | bufPos = (int)ftell(f); | |
639 | } | |
640 | bufPtr = bufEnd = buf; | |
641 | } | |
642 | ||
52118ca3 | 643 | void FileStream::moveStart(int delta) { |
644 | this->start += delta; | |
645 | bufPtr = bufEnd = buf; | |
646 | bufPos = start; | |
9c72faab | 647 | } |
648 | ||
649 | //------------------------------------------------------------------------ | |
52118ca3 | 650 | // EmbedStream |
9c72faab | 651 | //------------------------------------------------------------------------ |
652 | ||
b5cb0608 | 653 | EmbedStream::EmbedStream(Stream *nstr, Object *ndict): |
654 | BaseStream(ndict) { | |
655 | str = nstr; | |
9c72faab | 656 | } |
657 | ||
52118ca3 | 658 | EmbedStream::~EmbedStream() { |
659 | } | |
660 | ||
b5cb0608 | 661 | Stream *EmbedStream::makeSubStream(int start, int length, Object *ndict) { |
662 | (void)start; | |
663 | (void)length; | |
664 | (void)ndict; | |
665 | ||
52118ca3 | 666 | error(-1, "Internal: called makeSubStream() on EmbedStream"); |
667 | return NULL; | |
668 | } | |
669 | ||
670 | void EmbedStream::setPos(int pos) { | |
b5cb0608 | 671 | (void)pos; |
672 | ||
52118ca3 | 673 | error(-1, "Internal: called setPos() on EmbedStream"); |
674 | } | |
675 | ||
676 | int EmbedStream::getStart() { | |
677 | error(-1, "Internal: called getStart() on EmbedStream"); | |
678 | return 0; | |
679 | } | |
680 | ||
681 | void EmbedStream::moveStart(int start) { | |
b5cb0608 | 682 | (void)start; |
683 | ||
52118ca3 | 684 | error(-1, "Internal: called moveStart() on EmbedStream"); |
9c72faab | 685 | } |
686 | ||
687 | //------------------------------------------------------------------------ | |
688 | // ASCIIHexStream | |
689 | //------------------------------------------------------------------------ | |
690 | ||
52118ca3 | 691 | ASCIIHexStream::ASCIIHexStream(Stream *str): |
692 | FilterStream(str) { | |
9c72faab | 693 | buf = EOF; |
694 | eof = gFalse; | |
695 | } | |
696 | ||
697 | ASCIIHexStream::~ASCIIHexStream() { | |
698 | delete str; | |
699 | } | |
700 | ||
701 | void ASCIIHexStream::reset() { | |
702 | str->reset(); | |
703 | buf = EOF; | |
704 | eof = gFalse; | |
705 | } | |
706 | ||
707 | int ASCIIHexStream::lookChar() { | |
708 | int c1, c2, x; | |
709 | ||
710 | if (buf != EOF) | |
711 | return buf; | |
712 | if (eof) { | |
713 | buf = EOF; | |
714 | return EOF; | |
715 | } | |
716 | do { | |
717 | c1 = str->getChar(); | |
718 | } while (isspace(c1)); | |
719 | if (c1 == '>') { | |
720 | eof = gTrue; | |
721 | buf = EOF; | |
722 | return buf; | |
723 | } | |
724 | do { | |
725 | c2 = str->getChar(); | |
726 | } while (isspace(c2)); | |
727 | if (c2 == '>') { | |
728 | eof = gTrue; | |
729 | c2 = '0'; | |
730 | } | |
731 | if (c1 >= '0' && c1 <= '9') { | |
732 | x = (c1 - '0') << 4; | |
733 | } else if (c1 >= 'A' && c1 <= 'F') { | |
734 | x = (c1 - 'A' + 10) << 4; | |
735 | } else if (c1 >= 'a' && c1 <= 'f') { | |
736 | x = (c1 - 'a' + 10) << 4; | |
737 | } else if (c1 == EOF) { | |
738 | eof = gTrue; | |
739 | x = 0; | |
740 | } else { | |
741 | error(getPos(), "Illegal character <%02x> in ASCIIHex stream", c1); | |
742 | x = 0; | |
743 | } | |
744 | if (c2 >= '0' && c2 <= '9') { | |
745 | x += c2 - '0'; | |
746 | } else if (c2 >= 'A' && c2 <= 'F') { | |
747 | x += c2 - 'A' + 10; | |
748 | } else if (c2 >= 'a' && c2 <= 'f') { | |
749 | x += c2 - 'a' + 10; | |
750 | } else if (c2 == EOF) { | |
751 | eof = gTrue; | |
752 | x = 0; | |
753 | } else { | |
754 | error(getPos(), "Illegal character <%02x> in ASCIIHex stream", c2); | |
755 | } | |
756 | buf = x & 0xff; | |
757 | return buf; | |
758 | } | |
759 | ||
b5cb0608 | 760 | GString *ASCIIHexStream::getPSFilter(const char *indent) { |
9c72faab | 761 | GString *s; |
762 | ||
763 | s = str->getPSFilter(indent); | |
764 | s->append(indent)->append("/ASCIIHexDecode filter\n"); | |
765 | return s; | |
766 | } | |
767 | ||
768 | GBool ASCIIHexStream::isBinary(GBool last) { | |
b5cb0608 | 769 | (void)last; |
770 | ||
9c72faab | 771 | return str->isBinary(gFalse); |
772 | } | |
773 | ||
774 | //------------------------------------------------------------------------ | |
775 | // ASCII85Stream | |
776 | //------------------------------------------------------------------------ | |
777 | ||
52118ca3 | 778 | ASCII85Stream::ASCII85Stream(Stream *str): |
779 | FilterStream(str) { | |
9c72faab | 780 | index = n = 0; |
781 | eof = gFalse; | |
782 | } | |
783 | ||
784 | ASCII85Stream::~ASCII85Stream() { | |
785 | delete str; | |
786 | } | |
787 | ||
788 | void ASCII85Stream::reset() { | |
789 | str->reset(); | |
790 | index = n = 0; | |
791 | eof = gFalse; | |
792 | } | |
793 | ||
794 | int ASCII85Stream::lookChar() { | |
795 | int k; | |
796 | Gulong t; | |
797 | ||
798 | if (index >= n) { | |
799 | if (eof) | |
800 | return EOF; | |
801 | index = 0; | |
802 | do { | |
803 | c[0] = str->getChar(); | |
804 | } while (c[0] == '\n' || c[0] == '\r'); | |
805 | if (c[0] == '~' || c[0] == EOF) { | |
806 | eof = gTrue; | |
807 | n = 0; | |
808 | return EOF; | |
809 | } else if (c[0] == 'z') { | |
810 | b[0] = b[1] = b[2] = b[3] = 0; | |
811 | n = 4; | |
812 | } else { | |
813 | for (k = 1; k < 5; ++k) { | |
814 | do { | |
815 | c[k] = str->getChar(); | |
816 | } while (c[k] == '\n' || c[k] == '\r'); | |
817 | if (c[k] == '~' || c[k] == EOF) | |
818 | break; | |
819 | } | |
820 | n = k - 1; | |
821 | if (k < 5 && (c[k] == '~' || c[k] == EOF)) { | |
822 | for (++k; k < 5; ++k) | |
823 | c[k] = 0x21 + 84; | |
824 | eof = gTrue; | |
825 | } | |
826 | t = 0; | |
827 | for (k = 0; k < 5; ++k) | |
828 | t = t * 85 + (c[k] - 0x21); | |
829 | for (k = 3; k >= 0; --k) { | |
830 | b[k] = (int)(t & 0xff); | |
831 | t >>= 8; | |
832 | } | |
833 | } | |
834 | } | |
835 | return b[index]; | |
836 | } | |
837 | ||
b5cb0608 | 838 | GString *ASCII85Stream::getPSFilter(const char *indent) { |
9c72faab | 839 | GString *s; |
840 | ||
841 | s = str->getPSFilter(indent); | |
842 | s->append(indent)->append("/ASCII85Decode filter\n"); | |
843 | return s; | |
844 | } | |
845 | ||
846 | GBool ASCII85Stream::isBinary(GBool last) { | |
b5cb0608 | 847 | (void)last; |
848 | ||
9c72faab | 849 | return str->isBinary(gFalse); |
850 | } | |
851 | ||
852 | //------------------------------------------------------------------------ | |
853 | // LZWStream | |
854 | //------------------------------------------------------------------------ | |
855 | ||
52118ca3 | 856 | LZWStream::LZWStream(Stream *str, int predictor1, int columns1, int colors1, |
857 | int bits1, int early1): | |
858 | FilterStream(str) { | |
9c72faab | 859 | if (predictor1 != 1) { |
860 | pred = new StreamPredictor(this, predictor1, columns1, colors1, bits1); | |
861 | } else { | |
862 | pred = NULL; | |
863 | } | |
864 | early = early1; | |
865 | zPipe = NULL; | |
866 | bufPtr = bufEnd = buf; | |
867 | } | |
868 | ||
869 | LZWStream::~LZWStream() { | |
870 | if (zPipe) { | |
871 | #ifdef HAVE_POPEN | |
872 | pclose(zPipe); | |
873 | #else | |
874 | fclose(zPipe); | |
875 | #endif | |
876 | zPipe = NULL; | |
52118ca3 | 877 | unlink(zName->getCString()); |
878 | delete zName; | |
9c72faab | 879 | } |
880 | if (pred) { | |
881 | delete pred; | |
882 | } | |
883 | delete str; | |
884 | } | |
885 | ||
886 | int LZWStream::getChar() { | |
887 | if (pred) { | |
888 | return pred->getChar(); | |
889 | } | |
890 | return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr++ & 0xff); | |
891 | } | |
892 | ||
893 | int LZWStream::lookChar() { | |
894 | if (pred) { | |
895 | return pred->lookChar(); | |
896 | } | |
897 | return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr & 0xff); | |
898 | } | |
899 | ||
900 | int LZWStream::getRawChar() { | |
901 | return (bufPtr >= bufEnd && !fillBuf()) ? EOF : (*bufPtr++ & 0xff); | |
902 | } | |
903 | ||
904 | void LZWStream::reset() { | |
905 | FILE *f; | |
52118ca3 | 906 | GString *zCmd; |
9c72faab | 907 | |
52118ca3 | 908 | //----- close old LZW stream |
9c72faab | 909 | if (zPipe) { |
910 | #ifdef HAVE_POPEN | |
911 | pclose(zPipe); | |
912 | #else | |
913 | fclose(zPipe); | |
914 | #endif | |
915 | zPipe = NULL; | |
52118ca3 | 916 | unlink(zName->getCString()); |
917 | delete zName; | |
9c72faab | 918 | } |
52118ca3 | 919 | |
920 | //----- tell Delorie runtime to spawn a new instance of COMMAND.COM | |
921 | // to run gzip | |
9c72faab | 922 | #if __DJGPP__ |
923 | if (!setDJSYSFLAGS) { | |
924 | setenv("DJSYSFLAGS", "0x0002", 0); | |
925 | setDJSYSFLAGS = gTrue; | |
926 | } | |
927 | #endif | |
52118ca3 | 928 | |
929 | //----- create the .Z file | |
930 | if (!openTempFile(&zName, &f, "wb", ".Z")) { | |
931 | error(getPos(), "Couldn't create temporary file for LZW stream"); | |
9c72faab | 932 | return; |
933 | } | |
934 | dumpFile(f); | |
935 | fclose(f); | |
52118ca3 | 936 | |
937 | //----- execute uncompress / gzip | |
938 | zCmd = new GString(uncompressCmd); | |
939 | zCmd->append(' '); | |
940 | zCmd->append(zName); | |
941 | #if defined(MACOS) | |
942 | long magicCookie; | |
943 | // first we open the engine up | |
944 | OSErr err = OpenSITEngine(kUseExternalEngine, &magicCookie); | |
945 | // if we found it - let's use it! | |
946 | if (!err && magicCookie) { | |
947 | // make sure we have the correct version of the Engine | |
948 | if (GetSITEngineVersion(magicCookie) >= kFirstSupportedEngine) { | |
949 | FSSpec myFSS; | |
950 | Str255 pName; | |
951 | strcpy((char *)pName, zName->getCString()); | |
952 | c2pstr((char *)pName); | |
953 | FSMakeFSSpec(0, 0, pName, &myFSS); | |
954 | short ftype = DetermineFileType(magicCookie, &myFSS); | |
955 | OSErr expandErr = ExpandFSSpec(magicCookie, ftype, &myFSS, | |
956 | NULL, NULL, kCreateFolderNever, | |
957 | kDeleteOriginal, kTextConvertSmart); | |
958 | } | |
959 | } | |
960 | #elif defined(HAVE_POPEN) | |
961 | if (!(zPipe = popen(zCmd->getCString(), POPEN_READ_MODE))) { | |
962 | error(getPos(), "Couldn't popen '%s'", zCmd->getCString()); | |
963 | unlink(zName->getCString()); | |
964 | delete zName; | |
9c72faab | 965 | return; |
966 | } | |
52118ca3 | 967 | #else // HAVE_POPEN |
9c72faab | 968 | #ifdef VMS |
52118ca3 | 969 | if (!system(zCmd->getCString())) { |
9c72faab | 970 | #else |
52118ca3 | 971 | if (system(zCmd->getCString())) { |
9c72faab | 972 | #endif |
52118ca3 | 973 | error(getPos(), "Couldn't execute '%s'", zCmd->getCString()); |
974 | unlink(zName->getCString()); | |
975 | delete zName; | |
9c72faab | 976 | return; |
977 | } | |
52118ca3 | 978 | zName->del(zName->getLength() - 2, 2); |
979 | if (!(zPipe = fopen(zName->getCString(), "rb"))) { | |
980 | error(getPos(), "Couldn't open uncompress file '%s'", zName->getCString()); | |
981 | unlink(zName->getCString()); | |
982 | delete zName; | |
9c72faab | 983 | return; |
984 | } | |
52118ca3 | 985 | #endif // HAVE_POPEN |
986 | ||
987 | //----- clean up | |
988 | delete zCmd; | |
989 | ||
990 | //----- initialize buffer | |
991 | bufPtr = bufEnd = buf; | |
9c72faab | 992 | } |
993 | ||
994 | void LZWStream::dumpFile(FILE *f) { | |
995 | int outCodeBits; // size of output code | |
996 | int outBits; // max output code | |
997 | int outBuf[8]; // output buffer | |
998 | int outData; // temporary output buffer | |
999 | int inCode, outCode; // input and output codes | |
1000 | int nextCode; // next code index | |
1001 | GBool eof; // set when EOF is reached | |
1002 | GBool clear; // set if table needs to be cleared | |
1003 | GBool first; // indicates first code word after clear | |
1004 | int i, j; | |
1005 | ||
52118ca3 | 1006 | str->reset(); |
1007 | ||
9c72faab | 1008 | // magic number |
1009 | fputc(0x1f, f); | |
1010 | fputc(0x9d, f); | |
1011 | ||
1012 | // max code length, block mode flag | |
1013 | fputc(0x8c, f); | |
1014 | ||
1015 | // init input side | |
1016 | inCodeBits = 9; | |
1017 | inputBuf = 0; | |
1018 | inputBits = 0; | |
1019 | eof = gFalse; | |
1020 | ||
1021 | // init output side | |
1022 | outCodeBits = 9; | |
1023 | ||
1024 | // clear table | |
1025 | first = gTrue; | |
1026 | nextCode = 258; | |
1027 | ||
1028 | clear = gFalse; | |
1029 | do { | |
1030 | for (i = 0; i < 8; ++i) { | |
1031 | // check for table overflow | |
1032 | if (nextCode + early > 0x1001) { | |
1033 | inCode = 256; | |
1034 | ||
1035 | // read input code | |
1036 | } else { | |
1037 | do { | |
1038 | inCode = getCode(); | |
1039 | if (inCode == EOF) { | |
1040 | eof = gTrue; | |
1041 | inCode = 0; | |
1042 | } | |
1043 | } while (first && inCode == 256); | |
1044 | } | |
1045 | ||
1046 | // compute output code | |
1047 | if (inCode < 256) { | |
1048 | outCode = inCode; | |
1049 | } else if (inCode == 256) { | |
1050 | outCode = 256; | |
1051 | clear = gTrue; | |
1052 | } else if (inCode == 257) { | |
1053 | outCode = 0; | |
1054 | eof = gTrue; | |
1055 | } else { | |
1056 | outCode = inCode - 1; | |
1057 | } | |
1058 | outBuf[i] = outCode; | |
1059 | ||
1060 | // next code index | |
1061 | if (first) | |
1062 | first = gFalse; | |
1063 | else | |
1064 | ++nextCode; | |
1065 | ||
1066 | // check input code size | |
1067 | if (nextCode + early == 0x200) | |
1068 | inCodeBits = 10; | |
1069 | else if (nextCode + early == 0x400) { | |
1070 | inCodeBits = 11; | |
1071 | } else if (nextCode + early == 0x800) { | |
1072 | inCodeBits = 12; | |
1073 | } | |
1074 | ||
1075 | // check for eof/clear | |
1076 | if (eof) | |
1077 | break; | |
1078 | if (clear) { | |
1079 | i = 8; | |
1080 | break; | |
1081 | } | |
1082 | } | |
1083 | ||
1084 | // write output block | |
1085 | outData = 0; | |
1086 | outBits = 0; | |
1087 | j = 0; | |
1088 | while (j < i || outBits > 0) { | |
1089 | if (outBits < 8 && j < i) { | |
1090 | outData = outData | (outBuf[j++] << outBits); | |
1091 | outBits += outCodeBits; | |
1092 | } | |
1093 | fputc(outData & 0xff, f); | |
1094 | outData >>= 8; | |
1095 | outBits -= 8; | |
1096 | } | |
1097 | ||
1098 | // check output code size | |
1099 | if (nextCode - 1 == 512 || | |
1100 | nextCode - 1 == 1024 || | |
1101 | nextCode - 1 == 2048 || | |
1102 | nextCode - 1 == 4096) { | |
1103 | outCodeBits = inCodeBits; | |
1104 | } | |
1105 | ||
1106 | // clear table if necessary | |
1107 | if (clear) { | |
1108 | inCodeBits = 9; | |
1109 | outCodeBits = 9; | |
1110 | first = gTrue; | |
1111 | nextCode = 258; | |
1112 | clear = gFalse; | |
1113 | } | |
1114 | } while (!eof); | |
1115 | } | |
1116 | ||
1117 | int LZWStream::getCode() { | |
1118 | int c; | |
1119 | int code; | |
1120 | ||
1121 | while (inputBits < inCodeBits) { | |
1122 | if ((c = str->getChar()) == EOF) | |
1123 | return EOF; | |
1124 | inputBuf = (inputBuf << 8) | (c & 0xff); | |
1125 | inputBits += 8; | |
1126 | } | |
1127 | code = (inputBuf >> (inputBits - inCodeBits)) & ((1 << inCodeBits) - 1); | |
1128 | inputBits -= inCodeBits; | |
1129 | return code; | |
1130 | } | |
1131 | ||
1132 | GBool LZWStream::fillBuf() { | |
1133 | int n; | |
1134 | ||
1135 | if (!zPipe) | |
1136 | return gFalse; | |
1137 | if ((n = fread(buf, 1, 256, zPipe)) < 256) { | |
1138 | #ifdef HAVE_POPEN | |
1139 | pclose(zPipe); | |
1140 | #else | |
1141 | fclose(zPipe); | |
1142 | #endif | |
1143 | zPipe = NULL; | |
52118ca3 | 1144 | unlink(zName->getCString()); |
1145 | delete zName; | |
9c72faab | 1146 | } |
1147 | bufPtr = buf; | |
1148 | bufEnd = buf + n; | |
1149 | return n > 0; | |
1150 | } | |
1151 | ||
b5cb0608 | 1152 | GString *LZWStream::getPSFilter(const char *indent) { |
9c72faab | 1153 | GString *s; |
1154 | ||
1155 | if (pred) { | |
1156 | return NULL; | |
1157 | } | |
1158 | s = str->getPSFilter(indent); | |
1159 | s->append(indent)->append("/LZWDecode filter\n"); | |
1160 | return s; | |
1161 | } | |
1162 | ||
1163 | GBool LZWStream::isBinary(GBool last) { | |
b5cb0608 | 1164 | (void)last; |
1165 | ||
9c72faab | 1166 | return str->isBinary(gTrue); |
1167 | } | |
1168 | ||
1169 | //------------------------------------------------------------------------ | |
1170 | // RunLengthStream | |
1171 | //------------------------------------------------------------------------ | |
1172 | ||
52118ca3 | 1173 | RunLengthStream::RunLengthStream(Stream *str): |
1174 | FilterStream(str) { | |
9c72faab | 1175 | bufPtr = bufEnd = buf; |
1176 | eof = gFalse; | |
1177 | } | |
1178 | ||
1179 | RunLengthStream::~RunLengthStream() { | |
1180 | delete str; | |
1181 | } | |
1182 | ||
1183 | void RunLengthStream::reset() { | |
1184 | str->reset(); | |
1185 | bufPtr = bufEnd = buf; | |
1186 | eof = gFalse; | |
1187 | } | |
1188 | ||
b5cb0608 | 1189 | GString *RunLengthStream::getPSFilter(const char *indent) { |
9c72faab | 1190 | GString *s; |
1191 | ||
1192 | s = str->getPSFilter(indent); | |
1193 | s->append(indent)->append("/RunLengthDecode filter\n"); | |
1194 | return s; | |
1195 | } | |
1196 | ||
1197 | GBool RunLengthStream::isBinary(GBool last) { | |
b5cb0608 | 1198 | (void)last; |
1199 | ||
9c72faab | 1200 | return str->isBinary(gTrue); |
1201 | } | |
1202 | ||
1203 | GBool RunLengthStream::fillBuf() { | |
1204 | int c; | |
1205 | int n, i; | |
1206 | ||
1207 | if (eof) | |
1208 | return gFalse; | |
1209 | c = str->getChar(); | |
1210 | if (c == 0x80 || c == EOF) { | |
1211 | eof = gTrue; | |
1212 | return gFalse; | |
1213 | } | |
1214 | if (c < 0x80) { | |
1215 | n = c + 1; | |
1216 | for (i = 0; i < n; ++i) | |
1217 | buf[i] = (char)str->getChar(); | |
1218 | } else { | |
1219 | n = 0x101 - c; | |
1220 | c = str->getChar(); | |
1221 | for (i = 0; i < n; ++i) | |
1222 | buf[i] = (char)c; | |
1223 | } | |
1224 | bufPtr = buf; | |
1225 | bufEnd = buf + n; | |
1226 | return gTrue; | |
1227 | } | |
1228 | ||
1229 | //------------------------------------------------------------------------ | |
1230 | // CCITTFaxStream | |
1231 | //------------------------------------------------------------------------ | |
1232 | ||
b5cb0608 | 1233 | CCITTFaxStream::CCITTFaxStream(Stream *str, int nencoding, GBool nendOfLine, |
1234 | GBool nbyteAlign, int ncolumns, int nrows, | |
1235 | GBool nendOfBlock, GBool nblack): | |
52118ca3 | 1236 | FilterStream(str) { |
b5cb0608 | 1237 | encoding = nencoding; |
1238 | endOfLine = nendOfLine; | |
1239 | byteAlign = nbyteAlign; | |
1240 | columns = ncolumns; | |
1241 | rows = nrows; | |
1242 | endOfBlock = nendOfBlock; | |
1243 | black = nblack; | |
52118ca3 | 1244 | refLine = (short *)gmalloc((columns + 3) * sizeof(short)); |
9c72faab | 1245 | codingLine = (short *)gmalloc((columns + 2) * sizeof(short)); |
1246 | ||
1247 | eof = gFalse; | |
1248 | row = 0; | |
1249 | nextLine2D = encoding < 0; | |
1250 | inputBits = 0; | |
1251 | codingLine[0] = 0; | |
1252 | codingLine[1] = refLine[2] = columns; | |
1253 | a0 = 1; | |
1254 | ||
1255 | buf = EOF; | |
1256 | } | |
1257 | ||
1258 | CCITTFaxStream::~CCITTFaxStream() { | |
1259 | delete str; | |
1260 | gfree(refLine); | |
1261 | gfree(codingLine); | |
1262 | } | |
1263 | ||
1264 | void CCITTFaxStream::reset() { | |
1265 | int n; | |
1266 | ||
1267 | str->reset(); | |
1268 | eof = gFalse; | |
1269 | row = 0; | |
1270 | nextLine2D = encoding < 0; | |
1271 | inputBits = 0; | |
1272 | codingLine[0] = 0; | |
1273 | codingLine[1] = refLine[2] = columns; | |
1274 | a0 = 1; | |
1275 | buf = EOF; | |
1276 | ||
1277 | // get initial end-of-line marker and 2D encoding tag | |
1278 | if (endOfBlock) { | |
1279 | if (lookBits(12) == 0x001) { | |
1280 | eatBits(12); | |
1281 | } | |
1282 | } else { | |
1283 | for (n = 0; n < 11 && lookBits(n) == 0; ++n) ; | |
1284 | if (n == 11 && lookBits(12) == 0x001) { | |
1285 | eatBits(12); | |
1286 | } | |
1287 | } | |
1288 | if (encoding > 0) { | |
1289 | nextLine2D = !lookBits(1); | |
1290 | eatBits(1); | |
1291 | } | |
1292 | } | |
1293 | ||
1294 | int CCITTFaxStream::lookChar() { | |
1295 | short code1, code2, code3; | |
1296 | int a0New; | |
1297 | #if 0 //~ | |
1298 | GBool err; | |
1299 | #endif | |
b5cb0608 | 1300 | GBool gotEOL; |
9c72faab | 1301 | int ret; |
b5cb0608 | 1302 | int bits, i; |
9c72faab | 1303 | |
1304 | // if at eof just return EOF | |
1305 | if (eof && codingLine[a0] >= columns) { | |
1306 | return EOF; | |
1307 | } | |
1308 | ||
1309 | // read the next row | |
1310 | #if 0 //~ | |
1311 | err = gFalse; | |
1312 | #endif | |
1313 | if (codingLine[a0] >= columns) { | |
1314 | ||
1315 | // 2-D encoding | |
1316 | if (nextLine2D) { | |
1317 | for (i = 0; codingLine[i] < columns; ++i) | |
1318 | refLine[i] = codingLine[i]; | |
1319 | refLine[i] = refLine[i + 1] = columns; | |
1320 | b1 = 1; | |
1321 | a0New = codingLine[a0 = 0] = 0; | |
1322 | do { | |
1323 | code1 = getTwoDimCode(); | |
1324 | switch (code1) { | |
1325 | case twoDimPass: | |
1326 | if (refLine[b1] < columns) { | |
1327 | a0New = refLine[b1 + 1]; | |
1328 | b1 += 2; | |
1329 | } | |
1330 | break; | |
1331 | case twoDimHoriz: | |
1332 | if ((a0 & 1) == 0) { | |
1333 | code1 = code2 = 0; | |
1334 | do { | |
1335 | code1 += code3 = getWhiteCode(); | |
1336 | } while (code3 >= 64); | |
1337 | do { | |
1338 | code2 += code3 = getBlackCode(); | |
1339 | } while (code3 >= 64); | |
1340 | } else { | |
1341 | code1 = code2 = 0; | |
1342 | do { | |
1343 | code1 += code3 = getBlackCode(); | |
1344 | } while (code3 >= 64); | |
1345 | do { | |
1346 | code2 += code3 = getWhiteCode(); | |
1347 | } while (code3 >= 64); | |
1348 | } | |
1349 | codingLine[a0 + 1] = a0New + code1; | |
1350 | ++a0; | |
1351 | a0New = codingLine[a0 + 1] = codingLine[a0] + code2; | |
1352 | ++a0; | |
1353 | while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns) | |
1354 | b1 += 2; | |
1355 | break; | |
1356 | case twoDimVert0: | |
1357 | a0New = codingLine[++a0] = refLine[b1]; | |
1358 | if (refLine[b1] < columns) { | |
1359 | ++b1; | |
1360 | while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns) | |
1361 | b1 += 2; | |
1362 | } | |
1363 | break; | |
1364 | case twoDimVertR1: | |
1365 | a0New = codingLine[++a0] = refLine[b1] + 1; | |
1366 | if (refLine[b1] < columns) { | |
1367 | ++b1; | |
1368 | while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns) | |
1369 | b1 += 2; | |
1370 | } | |
1371 | break; | |
1372 | case twoDimVertL1: | |
1373 | a0New = codingLine[++a0] = refLine[b1] - 1; | |
1374 | --b1; | |
1375 | while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns) | |
1376 | b1 += 2; | |
1377 | break; | |
1378 | case twoDimVertR2: | |
1379 | a0New = codingLine[++a0] = refLine[b1] + 2; | |
1380 | if (refLine[b1] < columns) { | |
1381 | ++b1; | |
1382 | while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns) | |
1383 | b1 += 2; | |
1384 | } | |
1385 | break; | |
1386 | case twoDimVertL2: | |
1387 | a0New = codingLine[++a0] = refLine[b1] - 2; | |
1388 | --b1; | |
1389 | while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns) | |
1390 | b1 += 2; | |
1391 | break; | |
1392 | case twoDimVertR3: | |
1393 | a0New = codingLine[++a0] = refLine[b1] + 3; | |
1394 | if (refLine[b1] < columns) { | |
1395 | ++b1; | |
1396 | while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns) | |
1397 | b1 += 2; | |
1398 | } | |
1399 | break; | |
1400 | case twoDimVertL3: | |
1401 | a0New = codingLine[++a0] = refLine[b1] - 3; | |
1402 | --b1; | |
1403 | while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns) | |
1404 | b1 += 2; | |
1405 | break; | |
1406 | case EOF: | |
1407 | eof = gTrue; | |
1408 | codingLine[a0 = 0] = columns; | |
1409 | return EOF; | |
1410 | default: | |
1411 | error(getPos(), "Bad 2D code %04x in CCITTFax stream", code1); | |
1412 | #if 0 //~ | |
1413 | err = gTrue; | |
1414 | break; | |
1415 | #else | |
1416 | eof = gTrue; | |
1417 | return EOF; | |
1418 | #endif | |
1419 | } | |
1420 | } while (codingLine[a0] < columns); | |
1421 | ||
1422 | // 1-D encoding | |
1423 | } else { | |
1424 | codingLine[a0 = 0] = 0; | |
1425 | while (1) { | |
1426 | code1 = 0; | |
1427 | do { | |
1428 | code1 += code3 = getWhiteCode(); | |
1429 | } while (code3 >= 64); | |
1430 | codingLine[a0+1] = codingLine[a0] + code1; | |
1431 | ++a0; | |
1432 | if (codingLine[a0] >= columns) | |
1433 | break; | |
1434 | code2 = 0; | |
1435 | do { | |
1436 | code2 += code3 = getBlackCode(); | |
1437 | } while (code3 >= 64); | |
1438 | codingLine[a0+1] = codingLine[a0] + code2; | |
1439 | ++a0; | |
1440 | if (codingLine[a0] >= columns) | |
1441 | break; | |
1442 | } | |
1443 | } | |
1444 | ||
1445 | if (codingLine[a0] != columns) { | |
1446 | error(getPos(), "CCITTFax row is wrong length (%d)", codingLine[a0]); | |
1447 | #if 0 //~ | |
1448 | err = gTrue; | |
1449 | #endif | |
1450 | } | |
1451 | ||
1452 | // byte-align the row | |
1453 | if (byteAlign) { | |
1454 | inputBits &= ~7; | |
1455 | } | |
1456 | ||
b5cb0608 | 1457 | // check for end-of-line marker, skipping over any extra zero bits |
1458 | gotEOL = gFalse; | |
1459 | if (!endOfBlock && row == rows - 1) { | |
1460 | eof = gTrue; | |
1461 | } else { | |
9c72faab | 1462 | code1 = lookBits(12); |
b5cb0608 | 1463 | while (code1 == 0) { |
1464 | eatBits(1); | |
1465 | code1 = lookBits(12); | |
1466 | } | |
1467 | if (code1 == 0x001) { | |
1468 | eatBits(12); | |
1469 | gotEOL = gTrue; | |
1470 | } else if (code1 == EOF) { | |
9c72faab | 1471 | eof = gTrue; |
b5cb0608 | 1472 | } |
1473 | } | |
1474 | ||
1475 | // get 2D encoding tag | |
1476 | if (!eof && encoding > 0) { | |
1477 | nextLine2D = !lookBits(1); | |
1478 | eatBits(1); | |
1479 | } | |
1480 | ||
1481 | // check for end-of-block marker | |
1482 | if (endOfBlock && gotEOL) { | |
1483 | code1 = lookBits(12); | |
1484 | if (code1 == 0x001) { | |
9c72faab | 1485 | eatBits(12); |
1486 | if (encoding > 0) { | |
b5cb0608 | 1487 | lookBits(1); |
9c72faab | 1488 | eatBits(1); |
1489 | } | |
b5cb0608 | 1490 | if (encoding >= 0) { |
1491 | for (i = 0; i < 4; ++i) { | |
1492 | code1 = lookBits(12); | |
1493 | if (code1 != 0x001) { | |
1494 | error(getPos(), "Bad RTC code in CCITTFax stream"); | |
1495 | } | |
1496 | eatBits(12); | |
1497 | if (encoding > 0) { | |
1498 | lookBits(1); | |
1499 | eatBits(1); | |
9c72faab | 1500 | } |
1501 | } | |
9c72faab | 1502 | } |
9c72faab | 1503 | eof = gTrue; |
9c72faab | 1504 | } |
1505 | } | |
1506 | ||
1507 | #if 0 //~ | |
1508 | // This looks for an end-of-line marker after an error, however | |
1509 | // some (most?) CCITT streams in PDF files don't use end-of-line | |
1510 | // markers, and the just-plow-on technique works better in those | |
1511 | // cases. | |
1512 | else if (err) { | |
1513 | do { | |
1514 | if (code1 == EOF) { | |
1515 | eof = gTrue; | |
1516 | return EOF; | |
1517 | } | |
1518 | eatBits(1); | |
1519 | code1 = look13Bits(); | |
1520 | } while ((code1 >> 1) != 0x001); | |
1521 | eatBits(12); | |
1522 | codingLine[++a0] = columns; | |
1523 | if (encoding > 0) { | |
1524 | eatBits(1); | |
1525 | nextLine2D = !(code1 & 1); | |
1526 | } | |
1527 | } | |
1528 | #endif | |
1529 | ||
1530 | a0 = 0; | |
1531 | outputBits = codingLine[1] - codingLine[0]; | |
1532 | if (outputBits == 0) { | |
1533 | a0 = 1; | |
1534 | outputBits = codingLine[2] - codingLine[1]; | |
1535 | } | |
1536 | ||
1537 | ++row; | |
1538 | } | |
1539 | ||
1540 | // get a byte | |
1541 | if (outputBits >= 8) { | |
1542 | ret = ((a0 & 1) == 0) ? 0xff : 0x00; | |
1543 | if ((outputBits -= 8) == 0) { | |
1544 | ++a0; | |
1545 | if (codingLine[a0] < columns) { | |
1546 | outputBits = codingLine[a0 + 1] - codingLine[a0]; | |
1547 | } | |
1548 | } | |
1549 | } else { | |
1550 | bits = 8; | |
1551 | ret = 0; | |
1552 | do { | |
1553 | if (outputBits > bits) { | |
1554 | i = bits; | |
1555 | bits = 0; | |
1556 | if ((a0 & 1) == 0) { | |
1557 | ret |= 0xff >> (8 - i); | |
1558 | } | |
1559 | outputBits -= i; | |
1560 | } else { | |
1561 | i = outputBits; | |
1562 | bits -= outputBits; | |
1563 | if ((a0 & 1) == 0) { | |
1564 | ret |= (0xff >> (8 - i)) << bits; | |
1565 | } | |
1566 | outputBits = 0; | |
1567 | ++a0; | |
1568 | if (codingLine[a0] < columns) { | |
1569 | outputBits = codingLine[a0 + 1] - codingLine[a0]; | |
1570 | } | |
1571 | } | |
1572 | } while (bits > 0 && codingLine[a0] < columns); | |
1573 | } | |
1574 | buf = black ? (ret ^ 0xff) : ret; | |
1575 | return buf; | |
1576 | } | |
1577 | ||
1578 | short CCITTFaxStream::getTwoDimCode() { | |
1579 | short code; | |
1580 | CCITTCode *p; | |
1581 | int n; | |
1582 | ||
1583 | code = 0; // make gcc happy | |
1584 | if (endOfBlock) { | |
1585 | code = lookBits(7); | |
1586 | p = &twoDimTab1[code]; | |
1587 | if (p->bits > 0) { | |
1588 | eatBits(p->bits); | |
1589 | return p->n; | |
1590 | } | |
1591 | } else { | |
1592 | for (n = 1; n <= 7; ++n) { | |
1593 | code = lookBits(n); | |
1594 | if (n < 7) { | |
1595 | code <<= 7 - n; | |
1596 | } | |
1597 | p = &twoDimTab1[code]; | |
1598 | if (p->bits == n) { | |
1599 | eatBits(n); | |
1600 | return p->n; | |
1601 | } | |
1602 | } | |
1603 | } | |
1604 | error(getPos(), "Bad two dim code (%04x) in CCITTFax stream", code); | |
1605 | return EOF; | |
1606 | } | |
1607 | ||
1608 | short CCITTFaxStream::getWhiteCode() { | |
1609 | short code; | |
1610 | CCITTCode *p; | |
1611 | int n; | |
1612 | ||
1613 | code = 0; // make gcc happy | |
1614 | if (endOfBlock) { | |
1615 | code = lookBits(12); | |
b5cb0608 | 1616 | if ((code >> 5) == 0) { |
9c72faab | 1617 | p = &whiteTab1[code]; |
b5cb0608 | 1618 | } else { |
9c72faab | 1619 | p = &whiteTab2[code >> 3]; |
b5cb0608 | 1620 | } |
9c72faab | 1621 | if (p->bits > 0) { |
1622 | eatBits(p->bits); | |
1623 | return p->n; | |
1624 | } | |
1625 | } else { | |
1626 | for (n = 1; n <= 9; ++n) { | |
1627 | code = lookBits(n); | |
1628 | if (n < 9) { | |
1629 | code <<= 9 - n; | |
1630 | } | |
1631 | p = &whiteTab2[code]; | |
1632 | if (p->bits == n) { | |
1633 | eatBits(n); | |
1634 | return p->n; | |
1635 | } | |
1636 | } | |
1637 | for (n = 11; n <= 12; ++n) { | |
1638 | code = lookBits(n); | |
1639 | if (n < 12) { | |
1640 | code <<= 12 - n; | |
1641 | } | |
1642 | p = &whiteTab1[code]; | |
1643 | if (p->bits == n) { | |
1644 | eatBits(n); | |
1645 | return p->n; | |
1646 | } | |
1647 | } | |
1648 | } | |
1649 | error(getPos(), "Bad white code (%04x) in CCITTFax stream", code); | |
b5cb0608 | 1650 | // eat a bit and return a positive number so that the caller doesn't |
1651 | // go into an infinite loop | |
1652 | eatBits(1); | |
1653 | return 1; | |
9c72faab | 1654 | } |
1655 | ||
1656 | short CCITTFaxStream::getBlackCode() { | |
1657 | short code; | |
1658 | CCITTCode *p; | |
1659 | int n; | |
1660 | ||
1661 | code = 0; // make gcc happy | |
1662 | if (endOfBlock) { | |
1663 | code = lookBits(13); | |
b5cb0608 | 1664 | if ((code >> 7) == 0) { |
9c72faab | 1665 | p = &blackTab1[code]; |
b5cb0608 | 1666 | } else if ((code >> 9) == 0) { |
9c72faab | 1667 | p = &blackTab2[(code >> 1) - 64]; |
b5cb0608 | 1668 | } else { |
9c72faab | 1669 | p = &blackTab3[code >> 7]; |
b5cb0608 | 1670 | } |
9c72faab | 1671 | if (p->bits > 0) { |
1672 | eatBits(p->bits); | |
1673 | return p->n; | |
1674 | } | |
1675 | } else { | |
1676 | for (n = 2; n <= 6; ++n) { | |
1677 | code = lookBits(n); | |
1678 | if (n < 6) { | |
1679 | code <<= 6 - n; | |
1680 | } | |
1681 | p = &blackTab3[code]; | |
1682 | if (p->bits == n) { | |
1683 | eatBits(n); | |
1684 | return p->n; | |
1685 | } | |
1686 | } | |
1687 | for (n = 7; n <= 12; ++n) { | |
1688 | code = lookBits(n); | |
1689 | if (n < 12) { | |
1690 | code <<= 12 - n; | |
1691 | } | |
1692 | if (code >= 64) { | |
1693 | p = &blackTab2[code - 64]; | |
1694 | if (p->bits == n) { | |
1695 | eatBits(n); | |
1696 | return p->n; | |
1697 | } | |
1698 | } | |
1699 | } | |
1700 | for (n = 10; n <= 13; ++n) { | |
1701 | code = lookBits(n); | |
1702 | if (n < 13) { | |
1703 | code <<= 13 - n; | |
1704 | } | |
1705 | p = &blackTab1[code]; | |
1706 | if (p->bits == n) { | |
1707 | eatBits(n); | |
1708 | return p->n; | |
1709 | } | |
1710 | } | |
1711 | } | |
1712 | error(getPos(), "Bad black code (%04x) in CCITTFax stream", code); | |
b5cb0608 | 1713 | // eat a bit and return a positive number so that the caller doesn't |
1714 | // go into an infinite loop | |
1715 | eatBits(1); | |
1716 | return 1; | |
9c72faab | 1717 | } |
1718 | ||
1719 | short CCITTFaxStream::lookBits(int n) { | |
1720 | int c; | |
1721 | ||
1722 | while (inputBits < n) { | |
1723 | if ((c = str->getChar()) == EOF) { | |
b5cb0608 | 1724 | if (inputBits == 0) { |
9c72faab | 1725 | return EOF; |
b5cb0608 | 1726 | } |
1727 | // near the end of the stream, the caller may ask for more bits | |
1728 | // than are available, but there may still be a valid code in | |
1729 | // however many bits are available -- we need to return correct | |
1730 | // data in this case | |
1731 | return (inputBuf << (n - inputBits)) & (0xffff >> (16 - n)); | |
9c72faab | 1732 | } |
1733 | inputBuf = (inputBuf << 8) + c; | |
1734 | inputBits += 8; | |
1735 | } | |
1736 | return (inputBuf >> (inputBits - n)) & (0xffff >> (16 - n)); | |
1737 | } | |
1738 | ||
b5cb0608 | 1739 | GString *CCITTFaxStream::getPSFilter(const char *indent) { |
9c72faab | 1740 | GString *s; |
1741 | char s1[50]; | |
1742 | ||
1743 | s = str->getPSFilter(indent); | |
1744 | s->append(indent)->append("<< "); | |
1745 | if (encoding != 0) { | |
1746 | sprintf(s1, "/K %d ", encoding); | |
1747 | s->append(s1); | |
1748 | } | |
1749 | if (endOfLine) { | |
1750 | s->append("/EndOfLine true "); | |
1751 | } | |
1752 | if (byteAlign) { | |
1753 | s->append("/EncodedByteAlign true "); | |
1754 | } | |
1755 | sprintf(s1, "/Columns %d ", columns); | |
1756 | s->append(s1); | |
1757 | if (rows != 0) { | |
1758 | sprintf(s1, "/Rows %d ", rows); | |
1759 | s->append(s1); | |
1760 | } | |
1761 | if (!endOfBlock) { | |
1762 | s->append("/EndOfBlock false "); | |
1763 | } | |
1764 | if (black) { | |
1765 | s->append("/BlackIs1 true "); | |
1766 | } | |
1767 | s->append(">> /CCITTFaxDecode filter\n"); | |
1768 | return s; | |
1769 | } | |
1770 | ||
1771 | GBool CCITTFaxStream::isBinary(GBool last) { | |
b5cb0608 | 1772 | (void)last; |
1773 | ||
9c72faab | 1774 | return str->isBinary(gTrue); |
1775 | } | |
1776 | ||
1777 | //------------------------------------------------------------------------ | |
1778 | // DCTStream | |
1779 | //------------------------------------------------------------------------ | |
1780 | ||
1781 | // IDCT constants (20.12 fixed point format) | |
1782 | #ifndef FP_IDCT | |
1783 | #define dctCos1 4017 // cos(pi/16) | |
1784 | #define dctSin1 799 // sin(pi/16) | |
1785 | #define dctCos3 3406 // cos(3*pi/16) | |
1786 | #define dctSin3 2276 // sin(3*pi/16) | |
1787 | #define dctCos6 1567 // cos(6*pi/16) | |
1788 | #define dctSin6 3784 // sin(6*pi/16) | |
1789 | #define dctSqrt2 5793 // sqrt(2) | |
1790 | #define dctSqrt1d2 2896 // sqrt(2) / 2 | |
1791 | #endif | |
1792 | ||
1793 | // IDCT constants | |
1794 | #ifdef FP_IDCT | |
1795 | #define dctCos1 0.98078528 // cos(pi/16) | |
1796 | #define dctSin1 0.19509032 // sin(pi/16) | |
1797 | #define dctCos3 0.83146961 // cos(3*pi/16) | |
1798 | #define dctSin3 0.55557023 // sin(3*pi/16) | |
1799 | #define dctCos6 0.38268343 // cos(6*pi/16) | |
1800 | #define dctSin6 0.92387953 // sin(6*pi/16) | |
1801 | #define dctSqrt2 1.41421356 // sqrt(2) | |
1802 | #define dctSqrt1d2 0.70710678 // sqrt(2) / 2 | |
1803 | #endif | |
1804 | ||
1805 | // color conversion parameters (16.16 fixed point format) | |
1806 | #define dctCrToR 91881 // 1.4020 | |
1807 | #define dctCbToG -22553 // -0.3441363 | |
1808 | #define dctCrToG -46802 // -0.71413636 | |
1809 | #define dctCbToB 116130 // 1.772 | |
1810 | ||
1811 | // clip [-256,511] --> [0,255] | |
1812 | #define dctClipOffset 256 | |
1813 | static Guchar dctClip[768]; | |
1814 | static int dctClipInit = 0; | |
1815 | ||
1816 | // zig zag decode map | |
1817 | static int dctZigZag[64] = { | |
1818 | 0, | |
1819 | 1, 8, | |
1820 | 16, 9, 2, | |
1821 | 3, 10, 17, 24, | |
1822 | 32, 25, 18, 11, 4, | |
1823 | 5, 12, 19, 26, 33, 40, | |
1824 | 48, 41, 34, 27, 20, 13, 6, | |
1825 | 7, 14, 21, 28, 35, 42, 49, 56, | |
1826 | 57, 50, 43, 36, 29, 22, 15, | |
1827 | 23, 30, 37, 44, 51, 58, | |
1828 | 59, 52, 45, 38, 31, | |
1829 | 39, 46, 53, 60, | |
1830 | 61, 54, 47, | |
1831 | 55, 62, | |
1832 | 63 | |
1833 | }; | |
1834 | ||
52118ca3 | 1835 | DCTStream::DCTStream(Stream *str): |
1836 | FilterStream(str) { | |
9c72faab | 1837 | int i, j; |
1838 | ||
9c72faab | 1839 | width = height = 0; |
1840 | mcuWidth = mcuHeight = 0; | |
1841 | numComps = 0; | |
1842 | comp = 0; | |
1843 | x = y = dy = 0; | |
1844 | for (i = 0; i < 4; ++i) | |
1845 | for (j = 0; j < 32; ++j) | |
1846 | rowBuf[i][j] = NULL; | |
1847 | ||
1848 | if (!dctClipInit) { | |
1849 | for (i = -256; i < 0; ++i) | |
1850 | dctClip[dctClipOffset + i] = 0; | |
1851 | for (i = 0; i < 256; ++i) | |
1852 | dctClip[dctClipOffset + i] = i; | |
1853 | for (i = 256; i < 512; ++i) | |
1854 | dctClip[dctClipOffset + i] = 255; | |
1855 | dctClipInit = 1; | |
1856 | } | |
1857 | } | |
1858 | ||
1859 | DCTStream::~DCTStream() { | |
1860 | int i, j; | |
1861 | ||
1862 | delete str; | |
1863 | for (i = 0; i < numComps; ++i) | |
1864 | for (j = 0; j < mcuHeight; ++j) | |
1865 | gfree(rowBuf[i][j]); | |
1866 | } | |
1867 | ||
1868 | void DCTStream::reset() { | |
1869 | str->reset(); | |
1870 | if (!readHeader()) { | |
1871 | y = height; | |
1872 | return; | |
1873 | } | |
1874 | restartMarker = 0xd0; | |
1875 | restart(); | |
1876 | } | |
1877 | ||
1878 | int DCTStream::getChar() { | |
1879 | int c; | |
1880 | ||
1881 | c = lookChar(); | |
1882 | if (c == EOF) | |
1883 | return EOF; | |
1884 | if (++comp == numComps) { | |
1885 | comp = 0; | |
1886 | if (++x == width) { | |
1887 | x = 0; | |
1888 | ++y; | |
1889 | ++dy; | |
1890 | } | |
1891 | } | |
1892 | if (y == height) | |
1893 | readTrailer(); | |
1894 | return c; | |
1895 | } | |
1896 | ||
1897 | int DCTStream::lookChar() { | |
1898 | if (y >= height) | |
1899 | return EOF; | |
1900 | if (dy >= mcuHeight) { | |
1901 | if (!readMCURow()) { | |
1902 | y = height; | |
1903 | return EOF; | |
1904 | } | |
1905 | comp = 0; | |
1906 | x = 0; | |
1907 | dy = 0; | |
1908 | } | |
1909 | return rowBuf[comp][dy][x]; | |
1910 | } | |
1911 | ||
1912 | void DCTStream::restart() { | |
1913 | int i; | |
1914 | ||
1915 | inputBits = 0; | |
1916 | restartCtr = restartInterval; | |
1917 | for (i = 0; i < numComps; ++i) | |
1918 | compInfo[i].prevDC = 0; | |
1919 | } | |
1920 | ||
1921 | GBool DCTStream::readMCURow() { | |
1922 | Guchar data[64]; | |
1923 | Guchar *p1, *p2; | |
1924 | int pY, pCb, pCr, pR, pG, pB; | |
1925 | int h, v, horiz, vert, hSub, vSub; | |
1926 | int x1, x2, y2, x3, y3, x4, y4, x5, y5, cc, i; | |
1927 | int c; | |
1928 | ||
1929 | for (x1 = 0; x1 < width; x1 += mcuWidth) { | |
1930 | ||
1931 | // deal with restart marker | |
1932 | if (restartInterval > 0 && restartCtr == 0) { | |
1933 | c = readMarker(); | |
1934 | if (c != restartMarker) { | |
1935 | error(getPos(), "Bad DCT data: incorrect restart marker"); | |
1936 | return gFalse; | |
1937 | } | |
1938 | if (++restartMarker == 0xd8) | |
1939 | restartMarker = 0xd0; | |
1940 | restart(); | |
1941 | } | |
1942 | ||
1943 | // read one MCU | |
1944 | for (cc = 0; cc < numComps; ++cc) { | |
1945 | h = compInfo[cc].hSample; | |
1946 | v = compInfo[cc].vSample; | |
1947 | horiz = mcuWidth / h; | |
1948 | vert = mcuHeight / v; | |
1949 | hSub = horiz / 8; | |
1950 | vSub = vert / 8; | |
1951 | for (y2 = 0; y2 < mcuHeight; y2 += vert) { | |
1952 | for (x2 = 0; x2 < mcuWidth; x2 += horiz) { | |
1953 | if (!readDataUnit(&dcHuffTables[compInfo[cc].dcHuffTable], | |
1954 | &acHuffTables[compInfo[cc].acHuffTable], | |
1955 | quantTables[compInfo[cc].quantTable], | |
1956 | &compInfo[cc].prevDC, | |
1957 | data)) | |
1958 | return gFalse; | |
1959 | if (hSub == 1 && vSub == 1) { | |
1960 | for (y3 = 0, i = 0; y3 < 8; ++y3, i += 8) { | |
1961 | p1 = &rowBuf[cc][y2+y3][x1+x2]; | |
1962 | p1[0] = data[i]; | |
1963 | p1[1] = data[i+1]; | |
1964 | p1[2] = data[i+2]; | |
1965 | p1[3] = data[i+3]; | |
1966 | p1[4] = data[i+4]; | |
1967 | p1[5] = data[i+5]; | |
1968 | p1[6] = data[i+6]; | |
1969 | p1[7] = data[i+7]; | |
1970 | } | |
1971 | } else if (hSub == 2 && vSub == 2) { | |
1972 | for (y3 = 0, i = 0; y3 < 16; y3 += 2, i += 8) { | |
1973 | p1 = &rowBuf[cc][y2+y3][x1+x2]; | |
1974 | p2 = &rowBuf[cc][y2+y3+1][x1+x2]; | |
1975 | p1[0] = p1[1] = p2[0] = p2[1] = data[i]; | |
1976 | p1[2] = p1[3] = p2[2] = p2[3] = data[i+1]; | |
1977 | p1[4] = p1[5] = p2[4] = p2[5] = data[i+2]; | |
1978 | p1[6] = p1[7] = p2[6] = p2[7] = data[i+3]; | |
1979 | p1[8] = p1[9] = p2[8] = p2[9] = data[i+4]; | |
1980 | p1[10] = p1[11] = p2[10] = p2[11] = data[i+5]; | |
1981 | p1[12] = p1[13] = p2[12] = p2[13] = data[i+6]; | |
1982 | p1[14] = p1[15] = p2[14] = p2[15] = data[i+7]; | |
1983 | } | |
1984 | } else { | |
1985 | i = 0; | |
1986 | for (y3 = 0, y4 = 0; y3 < 8; ++y3, y4 += vSub) { | |
1987 | for (x3 = 0, x4 = 0; x3 < 8; ++x3, x4 += hSub) { | |
1988 | for (y5 = 0; y5 < vSub; ++y5) | |
1989 | for (x5 = 0; x5 < hSub; ++x5) | |
1990 | rowBuf[cc][y2+y4+y5][x1+x2+x4+x5] = data[i]; | |
1991 | ++i; | |
1992 | } | |
1993 | } | |
1994 | } | |
1995 | } | |
1996 | } | |
1997 | } | |
1998 | --restartCtr; | |
1999 | ||
2000 | // color space conversion | |
2001 | if (colorXform) { | |
2002 | // convert YCbCr to RGB | |
2003 | if (numComps == 3) { | |
2004 | for (y2 = 0; y2 < mcuHeight; ++y2) { | |
2005 | for (x2 = 0; x2 < mcuWidth; ++x2) { | |
2006 | pY = rowBuf[0][y2][x1+x2]; | |
2007 | pCb = rowBuf[1][y2][x1+x2] - 128; | |
2008 | pCr = rowBuf[2][y2][x1+x2] - 128; | |
2009 | pR = ((pY << 16) + dctCrToR * pCr + 32768) >> 16; | |
2010 | rowBuf[0][y2][x1+x2] = dctClip[dctClipOffset + pR]; | |
2011 | pG = ((pY << 16) + dctCbToG * pCb + dctCrToG * pCr + 32768) >> 16; | |
2012 | rowBuf[1][y2][x1+x2] = dctClip[dctClipOffset + pG]; | |
2013 | pB = ((pY << 16) + dctCbToB * pCb + 32768) >> 16; | |
2014 | rowBuf[2][y2][x1+x2] = dctClip[dctClipOffset + pB]; | |
2015 | } | |
2016 | } | |
2017 | // convert YCbCrK to CMYK (K is passed through unchanged) | |
2018 | } else if (numComps == 4) { | |
2019 | for (y2 = 0; y2 < mcuHeight; ++y2) { | |
2020 | for (x2 = 0; x2 < mcuWidth; ++x2) { | |
2021 | pY = rowBuf[0][y2][x1+x2]; | |
2022 | pCb = rowBuf[1][y2][x1+x2] - 128; | |
2023 | pCr = rowBuf[2][y2][x1+x2] - 128; | |
2024 | pR = ((pY << 16) + dctCrToR * pCr + 32768) >> 16; | |
2025 | rowBuf[0][y2][x1+x2] = 255 - dctClip[dctClipOffset + pR]; | |
2026 | pG = ((pY << 16) + dctCbToG * pCb + dctCrToG * pCr + 32678) >> 16; | |
2027 | rowBuf[1][y2][x1+x2] = 255 - dctClip[dctClipOffset + pG]; | |
2028 | pB = ((pY << 16) + dctCbToB * pCb + 32768) >> 16; | |
2029 | rowBuf[2][y2][x1+x2] = 255 - dctClip[dctClipOffset + pB]; | |
2030 | } | |
2031 | } | |
2032 | } | |
2033 | } | |
2034 | } | |
2035 | return gTrue; | |
2036 | } | |
2037 | ||
2038 | // This IDCT algorithm is taken from: | |
2039 | // Christoph Loeffler, Adriaan Ligtenberg, George S. Moschytz, | |
2040 | // "Practical Fast 1-D DCT Algorithms with 11 Multiplications", | |
2041 | // IEEE Intl. Conf. on Acoustics, Speech & Signal Processing, 1989, | |
2042 | // 988-991. | |
2043 | // The stage numbers mentioned in the comments refer to Figure 1 in this | |
2044 | // paper. | |
2045 | #ifndef FP_IDCT | |
2046 | GBool DCTStream::readDataUnit(DCTHuffTable *dcHuffTable, | |
2047 | DCTHuffTable *acHuffTable, | |
2048 | Guchar quantTable[64], int *prevDC, | |
2049 | Guchar data[64]) { | |
2050 | int tmp1[64]; | |
2051 | int v0, v1, v2, v3, v4, v5, v6, v7, t; | |
2052 | int run, size, amp; | |
2053 | int c; | |
2054 | int i, j; | |
2055 | ||
2056 | // Huffman decode and dequantize | |
2057 | size = readHuffSym(dcHuffTable); | |
2058 | if (size == 9999) | |
2059 | return gFalse; | |
2060 | if (size > 0) { | |
2061 | amp = readAmp(size); | |
2062 | if (amp == 9999) | |
2063 | return gFalse; | |
2064 | } else { | |
2065 | amp = 0; | |
2066 | } | |
2067 | tmp1[0] = (*prevDC += amp) * quantTable[0]; | |
2068 | for (i = 1; i < 64; ++i) | |
2069 | tmp1[i] = 0; | |
2070 | i = 1; | |
2071 | while (i < 64) { | |
2072 | run = 0; | |
2073 | while ((c = readHuffSym(acHuffTable)) == 0xf0 && run < 0x30) | |
2074 | run += 0x10; | |
2075 | if (c == 9999) | |
2076 | return gFalse; | |
2077 | if (c == 0x00) { | |
2078 | break; | |
2079 | } else { | |
2080 | run += (c >> 4) & 0x0f; | |
2081 | size = c & 0x0f; | |
2082 | amp = readAmp(size); | |
2083 | if (amp == 9999) | |
2084 | return gFalse; | |
2085 | i += run; | |
2086 | j = dctZigZag[i++]; | |
2087 | tmp1[j] = amp * quantTable[j]; | |
2088 | } | |
2089 | } | |
2090 | ||
2091 | // inverse DCT on rows | |
2092 | for (i = 0; i < 64; i += 8) { | |
2093 | ||
2094 | // stage 4 | |
2095 | v0 = (dctSqrt2 * tmp1[i+0] + 128) >> 8; | |
2096 | v1 = (dctSqrt2 * tmp1[i+4] + 128) >> 8; | |
2097 | v2 = tmp1[i+2]; | |
2098 | v3 = tmp1[i+6]; | |
2099 | v4 = (dctSqrt1d2 * (tmp1[i+1] - tmp1[i+7]) + 128) >> 8; | |
2100 | v7 = (dctSqrt1d2 * (tmp1[i+1] + tmp1[i+7]) + 128) >> 8; | |
2101 | v5 = tmp1[i+3] << 4; | |
2102 | v6 = tmp1[i+5] << 4; | |
2103 | ||
2104 | // stage 3 | |
2105 | t = (v0 - v1+ 1) >> 1; | |
2106 | v0 = (v0 + v1 + 1) >> 1; | |
2107 | v1 = t; | |
2108 | t = (v2 * dctSin6 + v3 * dctCos6 + 128) >> 8; | |
2109 | v2 = (v2 * dctCos6 - v3 * dctSin6 + 128) >> 8; | |
2110 | v3 = t; | |
2111 | t = (v4 - v6 + 1) >> 1; | |
2112 | v4 = (v4 + v6 + 1) >> 1; | |
2113 | v6 = t; | |
2114 | t = (v7 + v5 + 1) >> 1; | |
2115 | v5 = (v7 - v5 + 1) >> 1; | |
2116 | v7 = t; | |
2117 | ||
2118 | // stage 2 | |
2119 | t = (v0 - v3 + 1) >> 1; | |
2120 | v0 = (v0 + v3 + 1) >> 1; | |
2121 | v3 = t; | |
2122 | t = (v1 - v2 + 1) >> 1; | |
2123 | v1 = (v1 + v2 + 1) >> 1; | |
2124 | v2 = t; | |
2125 | t = (v4 * dctSin3 + v7 * dctCos3 + 2048) >> 12; | |
2126 | v4 = (v4 * dctCos3 - v7 * dctSin3 + 2048) >> 12; | |
2127 | v7 = t; | |
2128 | t = (v5 * dctSin1 + v6 * dctCos1 + 2048) >> 12; | |
2129 | v5 = (v5 * dctCos1 - v6 * dctSin1 + 2048) >> 12; | |
2130 | v6 = t; | |
2131 | ||
2132 | // stage 1 | |
2133 | tmp1[i+0] = v0 + v7; | |
2134 | tmp1[i+7] = v0 - v7; | |
2135 | tmp1[i+1] = v1 + v6; | |
2136 | tmp1[i+6] = v1 - v6; | |
2137 | tmp1[i+2] = v2 + v5; | |
2138 | tmp1[i+5] = v2 - v5; | |
2139 | tmp1[i+3] = v3 + v4; | |
2140 | tmp1[i+4] = v3 - v4; | |
2141 | } | |
2142 | ||
2143 | // inverse DCT on columns | |
2144 | for (i = 0; i < 8; ++i) { | |
2145 | ||
2146 | // stage 4 | |
2147 | v0 = (dctSqrt2 * tmp1[0*8+i] + 2048) >> 12; | |
2148 | v1 = (dctSqrt2 * tmp1[4*8+i] + 2048) >> 12; | |
2149 | v2 = tmp1[2*8+i]; | |
2150 | v3 = tmp1[6*8+i]; | |
2151 | v4 = (dctSqrt1d2 * (tmp1[1*8+i] - tmp1[7*8+i]) + 2048) >> 12; | |
2152 | v7 = (dctSqrt1d2 * (tmp1[1*8+i] + tmp1[7*8+i]) + 2048) >> 12; | |
2153 | v5 = tmp1[3*8+i]; | |
2154 | v6 = tmp1[5*8+i]; | |
2155 | ||
2156 | // stage 3 | |
2157 | t = (v0 - v1 + 1) >> 1; | |
2158 | v0 = (v0 + v1 + 1) >> 1; | |
2159 | v1 = t; | |
2160 | t = (v2 * dctSin6 + v3 * dctCos6 + 2048) >> 12; | |
2161 | v2 = (v2 * dctCos6 - v3 * dctSin6 + 2048) >> 12; | |
2162 | v3 = t; | |
2163 | t = (v4 - v6 + 1) >> 1; | |
2164 | v4 = (v4 + v6 + 1) >> 1; | |
2165 | v6 = t; | |
2166 | t = (v7 + v5 + 1) >> 1; | |
2167 | v5 = (v7 - v5 + 1) >> 1; | |
2168 | v7 = t; | |
2169 | ||
2170 | // stage 2 | |
2171 | t = (v0 - v3 + 1) >> 1; | |
2172 | v0 = (v0 + v3 + 1) >> 1; | |
2173 | v3 = t; | |
2174 | t = (v1 - v2 + 1) >> 1; | |
2175 | v1 = (v1 + v2 + 1) >> 1; | |
2176 | v2 = t; | |
2177 | t = (v4 * dctSin3 + v7 * dctCos3 + 2048) >> 12; | |
2178 | v4 = (v4 * dctCos3 - v7 * dctSin3 + 2048) >> 12; | |
2179 | v7 = t; | |
2180 | t = (v5 * dctSin1 + v6 * dctCos1 + 2048) >> 12; | |
2181 | v5 = (v5 * dctCos1 - v6 * dctSin1 + 2048) >> 12; | |
2182 | v6 = t; | |
2183 | ||
2184 | // stage 1 | |
2185 | tmp1[0*8+i] = v0 + v7; | |
2186 | tmp1[7*8+i] = v0 - v7; | |
2187 | tmp1[1*8+i] = v1 + v6; | |
2188 | tmp1[6*8+i] = v1 - v6; | |
2189 | tmp1[2*8+i] = v2 + v5; | |
2190 | tmp1[5*8+i] = v2 - v5; | |
2191 | tmp1[3*8+i] = v3 + v4; | |
2192 | tmp1[4*8+i] = v3 - v4; | |
2193 | } | |
2194 | ||
2195 | // convert to 8-bit integers | |
2196 | for (i = 0; i < 64; ++i) | |
2197 | data[i] = dctClip[dctClipOffset + 128 + ((tmp1[i] + 8) >> 4)]; | |
2198 | ||
2199 | return gTrue; | |
2200 | } | |
2201 | #endif | |
2202 | ||
2203 | #ifdef FP_IDCT | |
2204 | GBool DCTStream::readDataUnit(DCTHuffTable *dcHuffTable, | |
2205 | DCTHuffTable *acHuffTable, | |
2206 | Guchar quantTable[64], int *prevDC, | |
2207 | Guchar data[64]) { | |
2208 | double tmp1[64]; | |
2209 | double v0, v1, v2, v3, v4, v5, v6, v7, t; | |
2210 | int run, size, amp; | |
2211 | int c; | |
2212 | int i, j; | |
2213 | ||
2214 | // Huffman decode and dequantize | |
2215 | size = readHuffSym(dcHuffTable); | |
2216 | if (size == 9999) | |
2217 | return gFalse; | |
2218 | if (size > 0) { | |
2219 | amp = readAmp(size); | |
2220 | if (amp == 9999) | |
2221 | return gFalse; | |
2222 | } else { | |
2223 | amp = 0; | |
2224 | } | |
2225 | tmp1[0] = (*prevDC += amp) * quantTable[0]; | |
2226 | for (i = 1; i < 64; ++i) | |
2227 | tmp1[i] = 0; | |
2228 | i = 1; | |
2229 | while (i < 64) { | |
2230 | run = 0; | |
2231 | while ((c = readHuffSym(acHuffTable)) == 0xf0 && run < 0x30) | |
2232 | run += 0x10; | |
2233 | if (c == 9999) | |
2234 | return gFalse; | |
2235 | if (c == 0x00) { | |
2236 | break; | |
2237 | } else { | |
2238 | run += (c >> 4) & 0x0f; | |
2239 | size = c & 0x0f; | |
2240 | amp = readAmp(size); | |
2241 | if (amp == 9999) | |
2242 | return gFalse; | |
2243 | i += run; | |
2244 | j = dctZigZag[i++]; | |
2245 | tmp1[j] = amp * quantTable[j]; | |
2246 | } | |
2247 | } | |
2248 | ||
2249 | // inverse DCT on rows | |
2250 | for (i = 0; i < 64; i += 8) { | |
2251 | ||
2252 | // stage 4 | |
2253 | v0 = dctSqrt2 * tmp1[i+0]; | |
2254 | v1 = dctSqrt2 * tmp1[i+4]; | |
2255 | v2 = tmp1[i+2]; | |
2256 | v3 = tmp1[i+6]; | |
2257 | v4 = dctSqrt1d2 * (tmp1[i+1] - tmp1[i+7]); | |
2258 | v7 = dctSqrt1d2 * (tmp1[i+1] + tmp1[i+7]); | |
2259 | v5 = tmp1[i+3]; | |
2260 | v6 = tmp1[i+5]; | |
2261 | ||
2262 | // stage 3 | |
2263 | t = 0.5 * (v0 - v1); | |
2264 | v0 = 0.5 * (v0 + v1); | |
2265 | v1 = t; | |
2266 | t = v2 * dctSin6 + v3 * dctCos6; | |
2267 | v2 = v2 * dctCos6 - v3 * dctSin6; | |
2268 | v3 = t; | |
2269 | t = 0.5 * (v4 - v6); | |
2270 | v4 = 0.5 * (v4 + v6); | |
2271 | v6 = t; | |
2272 | t = 0.5 * (v7 + v5); | |
2273 | v5 = 0.5 * (v7 - v5); | |
2274 | v7 = t; | |
2275 | ||
2276 | // stage 2 | |
2277 | t = 0.5 * (v0 - v3); | |
2278 | v0 = 0.5 * (v0 + v3); | |
2279 | v3 = t; | |
2280 | t = 0.5 * (v1 - v2); | |
2281 | v1 = 0.5 * (v1 + v2); | |
2282 | v2 = t; | |
2283 | t = v4 * dctSin3 + v7 * dctCos3; | |
2284 | v4 = v4 * dctCos3 - v7 * dctSin3; | |
2285 | v7 = t; | |
2286 | t = v5 * dctSin1 + v6 * dctCos1; | |
2287 | v5 = v5 * dctCos1 - v6 * dctSin1; | |
2288 | v6 = t; | |
2289 | ||
2290 | // stage 1 | |
2291 | tmp1[i+0] = v0 + v7; | |
2292 | tmp1[i+7] = v0 - v7; | |
2293 | tmp1[i+1] = v1 + v6; | |
2294 | tmp1[i+6] = v1 - v6; | |
2295 | tmp1[i+2] = v2 + v5; | |
2296 | tmp1[i+5] = v2 - v5; | |
2297 | tmp1[i+3] = v3 + v4; | |
2298 | tmp1[i+4] = v3 - v4; | |
2299 | } | |
2300 | ||
2301 | // inverse DCT on columns | |
2302 | for (i = 0; i < 8; ++i) { | |
2303 | ||
2304 | // stage 4 | |
2305 | v0 = dctSqrt2 * tmp1[0*8+i]; | |
2306 | v1 = dctSqrt2 * tmp1[4*8+i]; | |
2307 | v2 = tmp1[2*8+i]; | |
2308 | v3 = tmp1[6*8+i]; | |
2309 | v4 = dctSqrt1d2 * (tmp1[1*8+i] - tmp1[7*8+i]); | |
2310 | v7 = dctSqrt1d2 * (tmp1[1*8+i] + tmp1[7*8+i]); | |
2311 | v5 = tmp1[3*8+i]; | |
2312 | v6 = tmp1[5*8+i]; | |
2313 | ||
2314 | // stage 3 | |
2315 | t = 0.5 * (v0 - v1); | |
2316 | v0 = 0.5 * (v0 + v1); | |
2317 | v1 = t; | |
2318 | t = v2 * dctSin6 + v3 * dctCos6; | |
2319 | v2 = v2 * dctCos6 - v3 * dctSin6; | |
2320 | v3 = t; | |
2321 | t = 0.5 * (v4 - v6); | |
2322 | v4 = 0.5 * (v4 + v6); | |
2323 | v6 = t; | |
2324 | t = 0.5 * (v7 + v5); | |
2325 | v5 = 0.5 * (v7 - v5); | |
2326 | v7 = t; | |
2327 | ||
2328 | // stage 2 | |
2329 | t = 0.5 * (v0 - v3); | |
2330 | v0 = 0.5 * (v0 + v3); | |
2331 | v3 = t; | |
2332 | t = 0.5 * (v1 - v2); | |
2333 | v1 = 0.5 * (v1 + v2); | |
2334 | v2 = t; | |
2335 | t = v4 * dctSin3 + v7 * dctCos3; | |
2336 | v4 = v4 * dctCos3 - v7 * dctSin3; | |
2337 | v7 = t; | |
2338 | t = v5 * dctSin1 + v6 * dctCos1; | |
2339 | v5 = v5 * dctCos1 - v6 * dctSin1; | |
2340 | v6 = t; | |
2341 | ||
2342 | // stage 1 | |
2343 | tmp1[0*8+i] = v0 + v7; | |
2344 | tmp1[7*8+i] = v0 - v7; | |
2345 | tmp1[1*8+i] = v1 + v6; | |
2346 | tmp1[6*8+i] = v1 - v6; | |
2347 | tmp1[2*8+i] = v2 + v5; | |
2348 | tmp1[5*8+i] = v2 - v5; | |
2349 | tmp1[3*8+i] = v3 + v4; | |
2350 | tmp1[4*8+i] = v3 - v4; | |
2351 | } | |
2352 | ||
2353 | // convert to 8-bit integers | |
2354 | for (i = 0; i < 64; ++i) | |
2355 | data[i] = dctClip[dctClipOffset + (int)(tmp1[i] + 128.5)]; | |
2356 | ||
2357 | return gTrue; | |
2358 | } | |
2359 | #endif | |
2360 | ||
2361 | int DCTStream::readHuffSym(DCTHuffTable *table) { | |
2362 | Gushort code; | |
2363 | int bit; | |
2364 | int codeBits; | |
2365 | ||
2366 | code = 0; | |
2367 | codeBits = 0; | |
2368 | do { | |
2369 | // add a bit to the code | |
2370 | if ((bit = readBit()) == EOF) | |
2371 | return 9999; | |
2372 | code = (code << 1) + bit; | |
2373 | ++codeBits; | |
2374 | ||
2375 | // look up code | |
2376 | if (code - table->firstCode[codeBits] < table->numCodes[codeBits]) { | |
2377 | code -= table->firstCode[codeBits]; | |
2378 | return table->sym[table->firstSym[codeBits] + code]; | |
2379 | } | |
2380 | } while (codeBits < 16); | |
2381 | ||
2382 | error(getPos(), "Bad Huffman code in DCT stream"); | |
2383 | return 9999; | |
2384 | } | |
2385 | ||
2386 | int DCTStream::readAmp(int size) { | |
2387 | int amp, bit; | |
2388 | int bits; | |
2389 | ||
2390 | amp = 0; | |
2391 | for (bits = 0; bits < size; ++bits) { | |
2392 | if ((bit = readBit()) == EOF) | |
2393 | return 9999; | |
2394 | amp = (amp << 1) + bit; | |
2395 | } | |
2396 | if (amp < (1 << (size - 1))) | |
2397 | amp -= (1 << size) - 1; | |
2398 | return amp; | |
2399 | } | |
2400 | ||
2401 | int DCTStream::readBit() { | |
2402 | int bit; | |
2403 | int c, c2; | |
2404 | ||
2405 | if (inputBits == 0) { | |
2406 | if ((c = str->getChar()) == EOF) | |
2407 | return EOF; | |
2408 | if (c == 0xff) { | |
2409 | do { | |
2410 | c2 = str->getChar(); | |
2411 | } while (c2 == 0xff); | |
2412 | if (c2 != 0x00) { | |
2413 | error(getPos(), "Bad DCT data: missing 00 after ff"); | |
2414 | return EOF; | |
2415 | } | |
2416 | } | |
2417 | inputBuf = c; | |
2418 | inputBits = 8; | |
2419 | } | |
2420 | bit = (inputBuf >> (inputBits - 1)) & 1; | |
2421 | --inputBits; | |
2422 | return bit; | |
2423 | } | |
2424 | ||
2425 | GBool DCTStream::readHeader() { | |
2426 | GBool doScan; | |
2427 | int minHSample, minVSample; | |
2428 | int bufWidth; | |
2429 | int n; | |
2430 | int c = 0; | |
2431 | int i, j; | |
2432 | ||
2433 | width = height = 0; | |
2434 | numComps = 0; | |
2435 | numQuantTables = 0; | |
2436 | numDCHuffTables = 0; | |
2437 | numACHuffTables = 0; | |
2438 | colorXform = 0; | |
2439 | gotAdobeMarker = gFalse; | |
2440 | restartInterval = 0; | |
2441 | ||
2442 | // read headers | |
2443 | doScan = gFalse; | |
2444 | while (!doScan) { | |
2445 | c = readMarker(); | |
2446 | switch (c) { | |
2447 | case 0xc0: // SOF0 | |
2448 | if (!readFrameInfo()) | |
2449 | return gFalse; | |
2450 | break; | |
2451 | case 0xc4: // DHT | |
2452 | if (!readHuffmanTables()) | |
2453 | return gFalse; | |
2454 | break; | |
2455 | case 0xd8: // SOI | |
2456 | break; | |
2457 | case 0xda: // SOS | |
2458 | if (!readScanInfo()) | |
2459 | return gFalse; | |
2460 | doScan = gTrue; | |
2461 | break; | |
2462 | case 0xdb: // DQT | |
2463 | if (!readQuantTables()) | |
2464 | return gFalse; | |
2465 | break; | |
2466 | case 0xdd: // DRI | |
2467 | if (!readRestartInterval()) | |
2468 | return gFalse; | |
2469 | break; | |
2470 | case 0xee: // APP14 | |
2471 | if (!readAdobeMarker()) | |
2472 | return gFalse; | |
2473 | break; | |
2474 | case EOF: | |
2475 | error(getPos(), "Bad DCT header"); | |
2476 | return gFalse; | |
2477 | default: | |
2478 | // skip APPn / COM / etc. | |
2479 | if (c >= 0xe0) { | |
2480 | n = read16() - 2; | |
2481 | for (i = 0; i < n; ++i) | |
2482 | str->getChar(); | |
2483 | } else { | |
2484 | error(getPos(), "Unknown DCT marker <%02x>", c); | |
2485 | return gFalse; | |
2486 | } | |
2487 | break; | |
2488 | } | |
2489 | } | |
2490 | ||
2491 | // compute MCU size | |
2492 | mcuWidth = minHSample = compInfo[0].hSample; | |
2493 | mcuHeight = minVSample = compInfo[0].vSample; | |
2494 | for (i = 1; i < numComps; ++i) { | |
2495 | if (compInfo[i].hSample < minHSample) | |
2496 | minHSample = compInfo[i].hSample; | |
2497 | if (compInfo[i].vSample < minVSample) | |
2498 | minVSample = compInfo[i].vSample; | |
2499 | if (compInfo[i].hSample > mcuWidth) | |
2500 | mcuWidth = compInfo[i].hSample; | |
2501 | if (compInfo[i].vSample > mcuHeight) | |
2502 | mcuHeight = compInfo[i].vSample; | |
2503 | } | |
2504 | for (i = 0; i < numComps; ++i) { | |
2505 | compInfo[i].hSample /= minHSample; | |
2506 | compInfo[i].vSample /= minVSample; | |
2507 | } | |
2508 | mcuWidth = (mcuWidth / minHSample) * 8; | |
2509 | mcuHeight = (mcuHeight / minVSample) * 8; | |
2510 | ||
2511 | // allocate buffers | |
2512 | bufWidth = ((width + mcuWidth - 1) / mcuWidth) * mcuWidth; | |
2513 | for (i = 0; i < numComps; ++i) | |
2514 | for (j = 0; j < mcuHeight; ++j) | |
2515 | rowBuf[i][j] = (Guchar *)gmalloc(bufWidth * sizeof(Guchar)); | |
2516 | ||
2517 | // figure out color transform | |
2518 | if (!gotAdobeMarker && numComps == 3) { | |
2519 | if (compInfo[0].id == 1 && compInfo[1].id == 2 && compInfo[2].id == 3) { | |
2520 | colorXform = 1; | |
2521 | } | |
2522 | } | |
2523 | ||
2524 | // initialize counters | |
2525 | comp = 0; | |
2526 | x = 0; | |
2527 | y = 0; | |
2528 | dy = mcuHeight; | |
2529 | ||
2530 | return gTrue; | |
2531 | } | |
2532 | ||
2533 | GBool DCTStream::readFrameInfo() { | |
2534 | int length; | |
2535 | int prec; | |
2536 | int i; | |
2537 | int c; | |
2538 | ||
2539 | length = read16() - 2; | |
2540 | prec = str->getChar(); | |
2541 | height = read16(); | |
2542 | width = read16(); | |
2543 | numComps = str->getChar(); | |
2544 | length -= 6; | |
2545 | if (prec != 8) { | |
2546 | error(getPos(), "Bad DCT precision %d", prec); | |
2547 | return gFalse; | |
2548 | } | |
2549 | for (i = 0; i < numComps; ++i) { | |
2550 | compInfo[i].id = str->getChar(); | |
2551 | compInfo[i].inScan = gFalse; | |
2552 | c = str->getChar(); | |
2553 | compInfo[i].hSample = (c >> 4) & 0x0f; | |
2554 | compInfo[i].vSample = c & 0x0f; | |
2555 | compInfo[i].quantTable = str->getChar(); | |
2556 | compInfo[i].dcHuffTable = 0; | |
2557 | compInfo[i].acHuffTable = 0; | |
2558 | } | |
2559 | return gTrue; | |
2560 | } | |
2561 | ||
2562 | GBool DCTStream::readScanInfo() { | |
2563 | int length; | |
2564 | int scanComps, id, c; | |
2565 | int i, j; | |
2566 | ||
2567 | length = read16() - 2; | |
2568 | scanComps = str->getChar(); | |
2569 | --length; | |
2570 | if (length != 2 * scanComps + 3) { | |
2571 | error(getPos(), "Bad DCT scan info block"); | |
2572 | return gFalse; | |
2573 | } | |
2574 | for (i = 0; i < scanComps; ++i) { | |
2575 | id = str->getChar(); | |
2576 | for (j = 0; j < numComps; ++j) { | |
2577 | if (id == compInfo[j].id) | |
2578 | break; | |
2579 | } | |
2580 | if (j == numComps) { | |
2581 | error(getPos(), "Bad DCT component ID in scan info block"); | |
2582 | return gFalse; | |
2583 | } | |
2584 | compInfo[j].inScan = gTrue; | |
2585 | c = str->getChar(); | |
2586 | compInfo[j].dcHuffTable = (c >> 4) & 0x0f; | |
2587 | compInfo[j].acHuffTable = c & 0x0f; | |
2588 | } | |
2589 | str->getChar(); | |
2590 | str->getChar(); | |
2591 | str->getChar(); | |
2592 | return gTrue; | |
2593 | } | |
2594 | ||
2595 | GBool DCTStream::readQuantTables() { | |
2596 | int length; | |
2597 | int i; | |
2598 | int index; | |
2599 | ||
2600 | length = read16() - 2; | |
2601 | while (length > 0) { | |
2602 | index = str->getChar(); | |
2603 | if ((index & 0xf0) || index >= 4) { | |
2604 | error(getPos(), "Bad DCT quantization table"); | |
2605 | return gFalse; | |
2606 | } | |
2607 | if (index == numQuantTables) | |
2608 | numQuantTables = index + 1; | |
2609 | for (i = 0; i < 64; ++i) | |
2610 | quantTables[index][dctZigZag[i]] = str->getChar(); | |
2611 | length -= 65; | |
2612 | } | |
2613 | return gTrue; | |
2614 | } | |
2615 | ||
2616 | GBool DCTStream::readHuffmanTables() { | |
2617 | DCTHuffTable *tbl; | |
2618 | int length; | |
2619 | int index; | |
2620 | Gushort code; | |
2621 | Guchar sym; | |
2622 | int i; | |
2623 | int c; | |
2624 | ||
2625 | length = read16() - 2; | |
2626 | while (length > 0) { | |
2627 | index = str->getChar(); | |
2628 | --length; | |
2629 | if ((index & 0x0f) >= 4) { | |
2630 | error(getPos(), "Bad DCT Huffman table"); | |
2631 | return gFalse; | |
2632 | } | |
2633 | if (index & 0x10) { | |
2634 | index &= 0x0f; | |
2635 | if (index >= numACHuffTables) | |
2636 | numACHuffTables = index+1; | |
2637 | tbl = &acHuffTables[index]; | |
2638 | } else { | |
2639 | if (index >= numDCHuffTables) | |
2640 | numDCHuffTables = index+1; | |
2641 | tbl = &dcHuffTables[index]; | |
2642 | } | |
2643 | sym = 0; | |
2644 | code = 0; | |
2645 | for (i = 1; i <= 16; ++i) { | |
2646 | c = str->getChar(); | |
2647 | tbl->firstSym[i] = sym; | |
2648 | tbl->firstCode[i] = code; | |
2649 | tbl->numCodes[i] = c; | |
2650 | sym += c; | |
2651 | code = (code + c) << 1; | |
2652 | } | |
2653 | length -= 16; | |
2654 | for (i = 0; i < sym; ++i) | |
2655 | tbl->sym[i] = str->getChar(); | |
2656 | length -= sym; | |
2657 | } | |
2658 | return gTrue; | |
2659 | } | |
2660 | ||
2661 | GBool DCTStream::readRestartInterval() { | |
2662 | int length; | |
2663 | ||
2664 | length = read16(); | |
2665 | if (length != 4) { | |
2666 | error(getPos(), "Bad DCT restart interval"); | |
2667 | return gFalse; | |
2668 | } | |
2669 | restartInterval = read16(); | |
2670 | return gTrue; | |
2671 | } | |
2672 | ||
2673 | GBool DCTStream::readAdobeMarker() { | |
2674 | int length, i; | |
2675 | char buf[12]; | |
2676 | int c; | |
2677 | ||
2678 | length = read16(); | |
2679 | if (length != 14) | |
2680 | goto err; | |
2681 | for (i = 0; i < 12; ++i) { | |
2682 | if ((c = str->getChar()) == EOF) | |
2683 | goto err; | |
2684 | buf[i] = c; | |
2685 | } | |
2686 | if (strncmp(buf, "Adobe", 5)) | |
2687 | goto err; | |
2688 | colorXform = buf[11]; | |
2689 | gotAdobeMarker = gTrue; | |
2690 | return gTrue; | |
2691 | ||
2692 | err: | |
2693 | error(getPos(), "Bad DCT Adobe APP14 marker"); | |
2694 | return gFalse; | |
2695 | } | |
2696 | ||
2697 | GBool DCTStream::readTrailer() { | |
2698 | int c; | |
2699 | ||
2700 | c = readMarker(); | |
2701 | if (c != 0xd9) { // EOI | |
2702 | error(getPos(), "Bad DCT trailer"); | |
2703 | return gFalse; | |
2704 | } | |
2705 | return gTrue; | |
2706 | } | |
2707 | ||
2708 | int DCTStream::readMarker() { | |
2709 | int c; | |
2710 | ||
2711 | do { | |
2712 | do { | |
2713 | c = str->getChar(); | |
2714 | } while (c != 0xff); | |
2715 | do { | |
2716 | c = str->getChar(); | |
2717 | } while (c == 0xff); | |
2718 | } while (c == 0x00); | |
2719 | return c; | |
2720 | } | |
2721 | ||
2722 | int DCTStream::read16() { | |
2723 | int c1, c2; | |
2724 | ||
2725 | if ((c1 = str->getChar()) == EOF) | |
2726 | return EOF; | |
2727 | if ((c2 = str->getChar()) == EOF) | |
2728 | return EOF; | |
2729 | return (c1 << 8) + c2; | |
2730 | } | |
2731 | ||
b5cb0608 | 2732 | GString *DCTStream::getPSFilter(const char *indent) { |
9c72faab | 2733 | GString *s; |
2734 | ||
2735 | s = str->getPSFilter(indent); | |
2736 | s->append(indent)->append("<< >> /DCTDecode filter\n"); | |
2737 | return s; | |
2738 | } | |
2739 | ||
2740 | GBool DCTStream::isBinary(GBool last) { | |
b5cb0608 | 2741 | (void)last; |
2742 | ||
9c72faab | 2743 | return str->isBinary(gTrue); |
2744 | } | |
2745 | ||
2746 | //------------------------------------------------------------------------ | |
2747 | // FlateStream | |
2748 | //------------------------------------------------------------------------ | |
2749 | ||
2750 | int FlateStream::codeLenCodeMap[flateMaxCodeLenCodes] = { | |
2751 | 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 | |
2752 | }; | |
2753 | ||
2754 | FlateDecode FlateStream::lengthDecode[flateMaxLitCodes-257] = { | |
2755 | {0, 3}, | |
2756 | {0, 4}, | |
2757 | {0, 5}, | |
2758 | {0, 6}, | |
2759 | {0, 7}, | |
2760 | {0, 8}, | |
2761 | {0, 9}, | |
2762 | {0, 10}, | |
2763 | {1, 11}, | |
2764 | {1, 13}, | |
2765 | {1, 15}, | |
2766 | {1, 17}, | |
2767 | {2, 19}, | |
2768 | {2, 23}, | |
2769 | {2, 27}, | |
2770 | {2, 31}, | |
2771 | {3, 35}, | |
2772 | {3, 43}, | |
2773 | {3, 51}, | |
2774 | {3, 59}, | |
2775 | {4, 67}, | |
2776 | {4, 83}, | |
2777 | {4, 99}, | |
2778 | {4, 115}, | |
2779 | {5, 131}, | |
2780 | {5, 163}, | |
2781 | {5, 195}, | |
2782 | {5, 227}, | |
2783 | {0, 258} | |
2784 | }; | |
2785 | ||
2786 | FlateDecode FlateStream::distDecode[flateMaxDistCodes] = { | |
2787 | { 0, 1}, | |
2788 | { 0, 2}, | |
2789 | { 0, 3}, | |
2790 | { 0, 4}, | |
2791 | { 1, 5}, | |
2792 | { 1, 7}, | |
2793 | { 2, 9}, | |
2794 | { 2, 13}, | |
2795 | { 3, 17}, | |
2796 | { 3, 25}, | |
2797 | { 4, 33}, | |
2798 | { 4, 49}, | |
2799 | { 5, 65}, | |
2800 | { 5, 97}, | |
2801 | { 6, 129}, | |
2802 | { 6, 193}, | |
2803 | { 7, 257}, | |
2804 | { 7, 385}, | |
2805 | { 8, 513}, | |
2806 | { 8, 769}, | |
2807 | { 9, 1025}, | |
2808 | { 9, 1537}, | |
2809 | {10, 2049}, | |
2810 | {10, 3073}, | |
2811 | {11, 4097}, | |
2812 | {11, 6145}, | |
2813 | {12, 8193}, | |
2814 | {12, 12289}, | |
2815 | {13, 16385}, | |
2816 | {13, 24577} | |
2817 | }; | |
2818 | ||
52118ca3 | 2819 | FlateStream::FlateStream(Stream *str, int predictor1, int columns1, |
2820 | int colors1, int bits1): | |
2821 | FilterStream(str) { | |
9c72faab | 2822 | if (predictor1 != 1) { |
2823 | pred = new StreamPredictor(this, predictor1, columns1, colors1, bits1); | |
2824 | } else { | |
2825 | pred = NULL; | |
2826 | } | |
2827 | } | |
2828 | ||
2829 | FlateStream::~FlateStream() { | |
2830 | if (pred) { | |
2831 | delete pred; | |
2832 | } | |
2833 | delete str; | |
2834 | } | |
2835 | ||
2836 | void FlateStream::reset() { | |
2837 | int cmf, flg; | |
2838 | ||
b5cb0608 | 2839 | index = 0; |
2840 | remain = 0; | |
2841 | codeBuf = 0; | |
2842 | codeSize = 0; | |
2843 | compressedBlock = gFalse; | |
2844 | endOfBlock = gTrue; | |
2845 | eof = gTrue; | |
2846 | ||
9c72faab | 2847 | str->reset(); |
2848 | ||
2849 | // read header | |
2850 | //~ need to look at window size? | |
2851 | endOfBlock = eof = gTrue; | |
2852 | cmf = str->getChar(); | |
2853 | flg = str->getChar(); | |
2854 | if (cmf == EOF || flg == EOF) | |
2855 | return; | |
2856 | if ((cmf & 0x0f) != 0x08) { | |
2857 | error(getPos(), "Unknown compression method in flate stream"); | |
2858 | return; | |
2859 | } | |
2860 | if ((((cmf << 8) + flg) % 31) != 0) { | |
2861 | error(getPos(), "Bad FCHECK in flate stream"); | |
2862 | return; | |
2863 | } | |
2864 | if (flg & 0x20) { | |
2865 | error(getPos(), "FDICT bit set in flate stream"); | |
2866 | return; | |
2867 | } | |
2868 | ||
9c72faab | 2869 | eof = gFalse; |
2870 | } | |
2871 | ||
2872 | int FlateStream::getChar() { | |
2873 | int c; | |
2874 | ||
2875 | if (pred) { | |
2876 | return pred->getChar(); | |
2877 | } | |
2878 | while (remain == 0) { | |
2879 | if (endOfBlock && eof) | |
2880 | return EOF; | |
2881 | readSome(); | |
2882 | } | |
2883 | c = buf[index]; | |
2884 | index = (index + 1) & flateMask; | |
2885 | --remain; | |
2886 | return c; | |
2887 | } | |
2888 | ||
2889 | int FlateStream::lookChar() { | |
2890 | int c; | |
2891 | ||
2892 | if (pred) { | |
2893 | return pred->lookChar(); | |
2894 | } | |
2895 | while (remain == 0) { | |
2896 | if (endOfBlock && eof) | |
2897 | return EOF; | |
2898 | readSome(); | |
2899 | } | |
2900 | c = buf[index]; | |
2901 | return c; | |
2902 | } | |
2903 | ||
2904 | int FlateStream::getRawChar() { | |
2905 | int c; | |
2906 | ||
2907 | while (remain == 0) { | |
2908 | if (endOfBlock && eof) | |
2909 | return EOF; | |
2910 | readSome(); | |
2911 | } | |
2912 | c = buf[index]; | |
2913 | index = (index + 1) & flateMask; | |
2914 | --remain; | |
2915 | return c; | |
2916 | } | |
2917 | ||
b5cb0608 | 2918 | GString *FlateStream::getPSFilter(const char *indent) { |
2919 | (void)indent; | |
2920 | ||
9c72faab | 2921 | return NULL; |
2922 | } | |
2923 | ||
2924 | GBool FlateStream::isBinary(GBool last) { | |
b5cb0608 | 2925 | (void)last; |
2926 | ||
9c72faab | 2927 | return str->isBinary(gTrue); |
2928 | } | |
2929 | ||
2930 | void FlateStream::readSome() { | |
2931 | int code1, code2; | |
2932 | int len, dist; | |
2933 | int i, j, k; | |
2934 | int c; | |
2935 | ||
2936 | if (endOfBlock) { | |
2937 | if (!startBlock()) | |
2938 | return; | |
2939 | } | |
2940 | ||
2941 | if (compressedBlock) { | |
2942 | if ((code1 = getHuffmanCodeWord(&litCodeTab)) == EOF) | |
2943 | goto err; | |
2944 | if (code1 < 256) { | |
2945 | buf[index] = code1; | |
2946 | remain = 1; | |
2947 | } else if (code1 == 256) { | |
2948 | endOfBlock = gTrue; | |
2949 | remain = 0; | |
2950 | } else { | |
2951 | code1 -= 257; | |
2952 | code2 = lengthDecode[code1].bits; | |
2953 | if (code2 > 0 && (code2 = getCodeWord(code2)) == EOF) | |
2954 | goto err; | |
2955 | len = lengthDecode[code1].first + code2; | |
2956 | if ((code1 = getHuffmanCodeWord(&distCodeTab)) == EOF) | |
2957 | goto err; | |
2958 | code2 = distDecode[code1].bits; | |
2959 | if (code2 > 0 && (code2 = getCodeWord(code2)) == EOF) | |
2960 | goto err; | |
2961 | dist = distDecode[code1].first + code2; | |
2962 | i = index; | |
2963 | j = (index - dist) & flateMask; | |
2964 | for (k = 0; k < len; ++k) { | |
2965 | buf[i] = buf[j]; | |
2966 | i = (i + 1) & flateMask; | |
2967 | j = (j + 1) & flateMask; | |
2968 | } | |
2969 | remain = len; | |
2970 | } | |
2971 | ||
2972 | } else { | |
2973 | len = (blockLen < flateWindow) ? blockLen : flateWindow; | |
2974 | for (i = 0, j = index; i < len; ++i, j = (j + 1) & flateMask) { | |
2975 | if ((c = str->getChar()) == EOF) { | |
2976 | endOfBlock = eof = gTrue; | |
2977 | break; | |
2978 | } | |
2979 | buf[j] = c & 0xff; | |
2980 | } | |
2981 | remain = i; | |
2982 | blockLen -= len; | |
2983 | if (blockLen == 0) | |
2984 | endOfBlock = gTrue; | |
2985 | } | |
2986 | ||
2987 | return; | |
2988 | ||
2989 | err: | |
2990 | error(getPos(), "Unexpected end of file in flate stream"); | |
2991 | endOfBlock = eof = gTrue; | |
2992 | remain = 0; | |
2993 | } | |
2994 | ||
2995 | GBool FlateStream::startBlock() { | |
2996 | int blockHdr; | |
2997 | int c; | |
2998 | int check; | |
2999 | ||
3000 | // read block header | |
3001 | blockHdr = getCodeWord(3); | |
3002 | if (blockHdr & 1) | |
3003 | eof = gTrue; | |
3004 | blockHdr >>= 1; | |
3005 | ||
3006 | // uncompressed block | |
3007 | if (blockHdr == 0) { | |
3008 | compressedBlock = gFalse; | |
3009 | if ((c = str->getChar()) == EOF) | |
3010 | goto err; | |
3011 | blockLen = c & 0xff; | |
3012 | if ((c = str->getChar()) == EOF) | |
3013 | goto err; | |
3014 | blockLen |= (c & 0xff) << 8; | |
3015 | if ((c = str->getChar()) == EOF) | |
3016 | goto err; | |
3017 | check = c & 0xff; | |
3018 | if ((c = str->getChar()) == EOF) | |
3019 | goto err; | |
3020 | check |= (c & 0xff) << 8; | |
3021 | if (check != (~blockLen & 0xffff)) | |
3022 | error(getPos(), "Bad uncompressed block length in flate stream"); | |
3023 | codeBuf = 0; | |
3024 | codeSize = 0; | |
3025 | ||
3026 | // compressed block with fixed codes | |
3027 | } else if (blockHdr == 1) { | |
3028 | compressedBlock = gTrue; | |
3029 | loadFixedCodes(); | |
3030 | ||
3031 | // compressed block with dynamic codes | |
3032 | } else if (blockHdr == 2) { | |
3033 | compressedBlock = gTrue; | |
3034 | if (!readDynamicCodes()) | |
3035 | goto err; | |
3036 | ||
3037 | // unknown block type | |
3038 | } else { | |
3039 | goto err; | |
3040 | } | |
3041 | ||
3042 | endOfBlock = gFalse; | |
3043 | return gTrue; | |
3044 | ||
3045 | err: | |
3046 | error(getPos(), "Bad block header in flate stream"); | |
3047 | endOfBlock = eof = gTrue; | |
3048 | return gFalse; | |
3049 | } | |
3050 | ||
3051 | void FlateStream::loadFixedCodes() { | |
3052 | int i; | |
3053 | ||
3054 | // set up code arrays | |
3055 | litCodeTab.codes = allCodes; | |
3056 | distCodeTab.codes = allCodes + flateMaxLitCodes; | |
3057 | ||
3058 | // initialize literal code table | |
3059 | for (i = 0; i <= 143; ++i) | |
3060 | litCodeTab.codes[i].len = 8; | |
3061 | for (i = 144; i <= 255; ++i) | |
3062 | litCodeTab.codes[i].len = 9; | |
3063 | for (i = 256; i <= 279; ++i) | |
3064 | litCodeTab.codes[i].len = 7; | |
3065 | for (i = 280; i <= 287; ++i) | |
3066 | litCodeTab.codes[i].len = 8; | |
3067 | compHuffmanCodes(&litCodeTab, flateMaxLitCodes); | |
3068 | ||
3069 | // initialize distance code table | |
52118ca3 | 3070 | for (i = 0; i <= 5; ++i) { |
9c72faab | 3071 | distCodeTab.start[i] = 0; |
52118ca3 | 3072 | } |
3073 | for (i = 6; i <= flateMaxHuffman+1; ++i) { | |
3074 | distCodeTab.start[i] = flateMaxDistCodes; | |
3075 | } | |
9c72faab | 3076 | for (i = 0; i < flateMaxDistCodes; ++i) { |
3077 | distCodeTab.codes[i].len = 5; | |
3078 | distCodeTab.codes[i].code = i; | |
3079 | distCodeTab.codes[i].val = i; | |
3080 | } | |
3081 | } | |
3082 | ||
3083 | GBool FlateStream::readDynamicCodes() { | |
3084 | int numCodeLenCodes; | |
3085 | int numLitCodes; | |
3086 | int numDistCodes; | |
3087 | FlateCode codeLenCodes[flateMaxCodeLenCodes]; | |
3088 | FlateHuffmanTab codeLenCodeTab; | |
3089 | int len, repeat, code; | |
3090 | int i; | |
3091 | ||
3092 | // read lengths | |
3093 | if ((numLitCodes = getCodeWord(5)) == EOF) | |
3094 | goto err; | |
3095 | numLitCodes += 257; | |
3096 | if ((numDistCodes = getCodeWord(5)) == EOF) | |
3097 | goto err; | |
3098 | numDistCodes += 1; | |
3099 | if ((numCodeLenCodes = getCodeWord(4)) == EOF) | |
3100 | goto err; | |
3101 | numCodeLenCodes += 4; | |
3102 | if (numLitCodes > flateMaxLitCodes || | |
3103 | numDistCodes > flateMaxDistCodes || | |
3104 | numCodeLenCodes > flateMaxCodeLenCodes) | |
3105 | goto err; | |
3106 | ||
3107 | // read code length code table | |
3108 | codeLenCodeTab.codes = codeLenCodes; | |
3109 | for (i = 0; i < flateMaxCodeLenCodes; ++i) | |
3110 | codeLenCodes[i].len = 0; | |
3111 | for (i = 0; i < numCodeLenCodes; ++i) { | |
3112 | if ((codeLenCodes[codeLenCodeMap[i]].len = getCodeWord(3)) == -1) | |
3113 | goto err; | |
3114 | } | |
3115 | compHuffmanCodes(&codeLenCodeTab, flateMaxCodeLenCodes); | |
3116 | ||
3117 | // set up code arrays | |
3118 | litCodeTab.codes = allCodes; | |
3119 | distCodeTab.codes = allCodes + numLitCodes; | |
3120 | ||
3121 | // read literal and distance code tables | |
3122 | len = 0; | |
3123 | repeat = 0; | |
3124 | i = 0; | |
3125 | while (i < numLitCodes + numDistCodes) { | |
3126 | if ((code = getHuffmanCodeWord(&codeLenCodeTab)) == EOF) | |
3127 | goto err; | |
3128 | if (code == 16) { | |
3129 | if ((repeat = getCodeWord(2)) == EOF) | |
3130 | goto err; | |
3131 | for (repeat += 3; repeat > 0; --repeat) | |
3132 | allCodes[i++].len = len; | |
3133 | } else if (code == 17) { | |
3134 | if ((repeat = getCodeWord(3)) == EOF) | |
3135 | goto err; | |
3136 | len = 0; | |
3137 | for (repeat += 3; repeat > 0; --repeat) | |
3138 | allCodes[i++].len = 0; | |
3139 | } else if (code == 18) { | |
3140 | if ((repeat = getCodeWord(7)) == EOF) | |
3141 | goto err; | |
3142 | len = 0; | |
3143 | for (repeat += 11; repeat > 0; --repeat) | |
3144 | allCodes[i++].len = 0; | |
3145 | } else { | |
3146 | allCodes[i++].len = len = code; | |
3147 | } | |
3148 | } | |
3149 | compHuffmanCodes(&litCodeTab, numLitCodes); | |
3150 | compHuffmanCodes(&distCodeTab, numDistCodes); | |
3151 | ||
3152 | return gTrue; | |
3153 | ||
3154 | err: | |
3155 | error(getPos(), "Bad dynamic code table in flate stream"); | |
3156 | return gFalse; | |
3157 | } | |
3158 | ||
3159 | // On entry, the <tab->codes> array contains the lengths of each code, | |
3160 | // stored in code value order. This function computes the code words. | |
3161 | // The result is sorted in order of (1) code length and (2) code word. | |
3162 | // The length values are no longer valid. The <tab->start> array is | |
3163 | // filled with the indexes of the first code of each length. | |
3164 | void FlateStream::compHuffmanCodes(FlateHuffmanTab *tab, int n) { | |
3165 | int numLengths[flateMaxHuffman+1]; | |
3166 | int nextCode[flateMaxHuffman+1]; | |
3167 | int nextIndex[flateMaxHuffman+2]; | |
3168 | int code; | |
3169 | int i, j; | |
3170 | ||
3171 | // count number of codes for each code length | |
3172 | for (i = 0; i <= flateMaxHuffman; ++i) | |
3173 | numLengths[i] = 0; | |
3174 | for (i = 0; i < n; ++i) | |
3175 | ++numLengths[tab->codes[i].len]; | |
3176 | ||
3177 | // compute first index for each length | |
3178 | tab->start[0] = nextIndex[0] = 0; | |
3179 | for (i = 1; i <= flateMaxHuffman + 1; ++i) | |
3180 | tab->start[i] = nextIndex[i] = tab->start[i-1] + numLengths[i-1]; | |
3181 | ||
3182 | // compute first code for each length | |
3183 | code = 0; | |
3184 | numLengths[0] = 0; | |
3185 | for (i = 1; i <= flateMaxHuffman; ++i) { | |
3186 | code = (code + numLengths[i-1]) << 1; | |
3187 | nextCode[i] = code; | |
3188 | } | |
3189 | ||
3190 | // compute the codes -- this permutes the codes array from value | |
3191 | // order to length/code order | |
3192 | for (i = 0; i < n; ++i) { | |
3193 | j = nextIndex[tab->codes[i].len]++; | |
3194 | if (tab->codes[i].len == 0) | |
3195 | tab->codes[j].code = 0; | |
3196 | else | |
3197 | tab->codes[j].code = nextCode[tab->codes[i].len]++; | |
3198 | tab->codes[j].val = i; | |
3199 | } | |
3200 | } | |
3201 | ||
3202 | int FlateStream::getHuffmanCodeWord(FlateHuffmanTab *tab) { | |
3203 | int len; | |
3204 | int code; | |
3205 | int c; | |
3206 | int i, j; | |
3207 | ||
3208 | code = 0; | |
3209 | for (len = 1; len <= flateMaxHuffman; ++len) { | |
3210 | ||
3211 | // add a bit to the code | |
3212 | if (codeSize == 0) { | |
3213 | if ((c = str->getChar()) == EOF) | |
3214 | return EOF; | |
3215 | codeBuf = c & 0xff; | |
3216 | codeSize = 8; | |
3217 | } | |
3218 | code = (code << 1) | (codeBuf & 1); | |
3219 | codeBuf >>= 1; | |
3220 | --codeSize; | |
3221 | ||
3222 | // look for code | |
3223 | i = tab->start[len]; | |
3224 | j = tab->start[len + 1]; | |
3225 | if (i < j && code >= tab->codes[i].code && code <= tab->codes[j-1].code) { | |
3226 | i += code - tab->codes[i].code; | |
3227 | return tab->codes[i].val; | |
3228 | } | |
3229 | } | |
3230 | ||
3231 | // not found | |
3232 | error(getPos(), "Bad code (%04x) in flate stream", code); | |
3233 | return EOF; | |
3234 | } | |
3235 | ||
3236 | int FlateStream::getCodeWord(int bits) { | |
3237 | int c; | |
3238 | ||
3239 | while (codeSize < bits) { | |
3240 | if ((c = str->getChar()) == EOF) | |
3241 | return EOF; | |
3242 | codeBuf |= (c & 0xff) << codeSize; | |
3243 | codeSize += 8; | |
3244 | } | |
3245 | c = codeBuf & ((1 << bits) - 1); | |
3246 | codeBuf >>= bits; | |
3247 | codeSize -= bits; | |
3248 | return c; | |
3249 | } | |
3250 | ||
3251 | //------------------------------------------------------------------------ | |
3252 | // EOFStream | |
3253 | //------------------------------------------------------------------------ | |
3254 | ||
52118ca3 | 3255 | EOFStream::EOFStream(Stream *str): |
3256 | FilterStream(str) { | |
9c72faab | 3257 | } |
3258 | ||
3259 | EOFStream::~EOFStream() { | |
3260 | delete str; | |
3261 | } | |
3262 | ||
3263 | //------------------------------------------------------------------------ | |
3264 | // FixedLengthEncoder | |
3265 | //------------------------------------------------------------------------ | |
3266 | ||
52118ca3 | 3267 | FixedLengthEncoder::FixedLengthEncoder(Stream *str, int length1): |
3268 | FilterStream(str) { | |
9c72faab | 3269 | length = length1; |
3270 | count = 0; | |
3271 | } | |
3272 | ||
3273 | FixedLengthEncoder::~FixedLengthEncoder() { | |
3274 | if (str->isEncoder()) | |
3275 | delete str; | |
3276 | } | |
3277 | ||
3278 | void FixedLengthEncoder::reset() { | |
3279 | str->reset(); | |
3280 | count = 0; | |
3281 | } | |
3282 | ||
b5cb0608 | 3283 | void FixedLengthEncoder::close() { |
3284 | } | |
3285 | ||
9c72faab | 3286 | int FixedLengthEncoder::getChar() { |
3287 | if (length >= 0 && count >= length) | |
3288 | return EOF; | |
3289 | ++count; | |
3290 | return str->getChar(); | |
3291 | } | |
3292 | ||
3293 | int FixedLengthEncoder::lookChar() { | |
3294 | if (length >= 0 && count >= length) | |
3295 | return EOF; | |
3296 | return str->getChar(); | |
3297 | } | |
3298 | ||
3299 | //------------------------------------------------------------------------ | |
3300 | // ASCII85Encoder | |
3301 | //------------------------------------------------------------------------ | |
3302 | ||
52118ca3 | 3303 | ASCII85Encoder::ASCII85Encoder(Stream *str): |
3304 | FilterStream(str) { | |
9c72faab | 3305 | bufPtr = bufEnd = buf; |
3306 | lineLen = 0; | |
3307 | eof = gFalse; | |
3308 | } | |
3309 | ||
3310 | ASCII85Encoder::~ASCII85Encoder() { | |
3311 | if (str->isEncoder()) | |
3312 | delete str; | |
3313 | } | |
3314 | ||
3315 | void ASCII85Encoder::reset() { | |
3316 | str->reset(); | |
3317 | bufPtr = bufEnd = buf; | |
3318 | lineLen = 0; | |
3319 | eof = gFalse; | |
3320 | } | |
3321 | ||
b5cb0608 | 3322 | void ASCII85Encoder::close() { |
3323 | } | |
3324 | ||
9c72faab | 3325 | GBool ASCII85Encoder::fillBuf() { |
3326 | Gulong t; | |
3327 | char buf1[5]; | |
3328 | int c; | |
3329 | int n, i; | |
3330 | ||
3331 | if (eof) | |
3332 | return gFalse; | |
3333 | t = 0; | |
3334 | for (n = 0; n < 4; ++n) { | |
3335 | if ((c = str->getChar()) == EOF) | |
3336 | break; | |
3337 | t = (t << 8) + c; | |
3338 | } | |
3339 | bufPtr = bufEnd = buf; | |
3340 | if (n > 0) { | |
3341 | if (n == 4 && t == 0) { | |
3342 | *bufEnd++ = 'z'; | |
3343 | if (++lineLen == 65) { | |
3344 | *bufEnd++ = '\n'; | |
3345 | lineLen = 0; | |
3346 | } | |
3347 | } else { | |
3348 | if (n < 4) | |
3349 | t <<= 8 * (4 - n); | |
3350 | for (i = 4; i >= 0; --i) { | |
3351 | buf1[i] = (char)(t % 85 + 0x21); | |
3352 | t /= 85; | |
3353 | } | |
3354 | for (i = 0; i <= n; ++i) { | |
3355 | *bufEnd++ = buf1[i]; | |
3356 | if (++lineLen == 65) { | |
3357 | *bufEnd++ = '\n'; | |
3358 | lineLen = 0; | |
3359 | } | |
3360 | } | |
3361 | } | |
3362 | } | |
3363 | if (n < 4) { | |
3364 | *bufEnd++ = '~'; | |
3365 | *bufEnd++ = '>'; | |
3366 | eof = gTrue; | |
3367 | } | |
3368 | return bufPtr < bufEnd; | |
3369 | } | |
3370 | ||
3371 | //------------------------------------------------------------------------ | |
3372 | // RunLengthEncoder | |
3373 | //------------------------------------------------------------------------ | |
3374 | ||
52118ca3 | 3375 | RunLengthEncoder::RunLengthEncoder(Stream *str): |
3376 | FilterStream(str) { | |
9c72faab | 3377 | bufPtr = bufEnd = nextEnd = buf; |
3378 | eof = gFalse; | |
3379 | } | |
3380 | ||
3381 | RunLengthEncoder::~RunLengthEncoder() { | |
3382 | if (str->isEncoder()) | |
3383 | delete str; | |
3384 | } | |
3385 | ||
3386 | void RunLengthEncoder::reset() { | |
3387 | str->reset(); | |
3388 | bufPtr = bufEnd = nextEnd = buf; | |
3389 | eof = gFalse; | |
3390 | } | |
3391 | ||
b5cb0608 | 3392 | void RunLengthEncoder::close() { |
3393 | } | |
3394 | ||
9c72faab | 3395 | // |
3396 | // When fillBuf finishes, buf[] looks like this: | |
3397 | // +-----+--------------+-----------------+-- | |
3398 | // + tag | ... data ... | next 0, 1, or 2 | | |
3399 | // +-----+--------------+-----------------+-- | |
3400 | // ^ ^ ^ | |
3401 | // bufPtr bufEnd nextEnd | |
3402 | // | |
3403 | GBool RunLengthEncoder::fillBuf() { | |
3404 | int c, c1, c2; | |
3405 | int n; | |
3406 | ||
3407 | // already hit EOF? | |
3408 | if (eof) | |
3409 | return gFalse; | |
3410 | ||
3411 | // grab two bytes | |
3412 | if (nextEnd < bufEnd + 1) { | |
3413 | if ((c1 = str->getChar()) == EOF) { | |
3414 | eof = gTrue; | |
3415 | return gFalse; | |
3416 | } | |
3417 | } else { | |
3418 | c1 = bufEnd[0] & 0xff; | |
3419 | } | |
3420 | if (nextEnd < bufEnd + 2) { | |
3421 | if ((c2 = str->getChar()) == EOF) { | |
3422 | eof = gTrue; | |
3423 | buf[0] = 0; | |
3424 | buf[1] = c1; | |
3425 | bufPtr = buf; | |
3426 | bufEnd = &buf[2]; | |
3427 | return gTrue; | |
3428 | } | |
3429 | } else { | |
3430 | c2 = bufEnd[1] & 0xff; | |
3431 | } | |
3432 | ||
3433 | // check for repeat | |
52118ca3 | 3434 | c = 0; // make gcc happy |
9c72faab | 3435 | if (c1 == c2) { |
3436 | n = 2; | |
b6ea8f29 | 3437 | c = 0; // suppress bogus compiler warning |
9c72faab | 3438 | while (n < 128 && (c = str->getChar()) == c1) |
3439 | ++n; | |
3440 | buf[0] = (char)(257 - n); | |
3441 | buf[1] = c1; | |
3442 | bufEnd = &buf[2]; | |
3443 | if (c == EOF) { | |
3444 | eof = gTrue; | |
3445 | } else if (n < 128) { | |
3446 | buf[2] = c; | |
3447 | nextEnd = &buf[3]; | |
3448 | } else { | |
3449 | nextEnd = bufEnd; | |
3450 | } | |
3451 | ||
3452 | // get up to 128 chars | |
3453 | } else { | |
3454 | buf[1] = c1; | |
3455 | buf[2] = c2; | |
3456 | n = 2; | |
3457 | while (n < 128) { | |
3458 | if ((c = str->getChar()) == EOF) { | |
3459 | eof = gTrue; | |
3460 | break; | |
3461 | } | |
3462 | ++n; | |
3463 | buf[n] = c; | |
3464 | if (buf[n] == buf[n-1]) | |
3465 | break; | |
3466 | } | |
3467 | if (buf[n] == buf[n-1]) { | |
3468 | buf[0] = (char)(n-2-1); | |
3469 | bufEnd = &buf[n-1]; | |
3470 | nextEnd = &buf[n+1]; | |
3471 | } else { | |
3472 | buf[0] = (char)(n-1); | |
3473 | bufEnd = nextEnd = &buf[n+1]; | |
3474 | } | |
3475 | } | |
3476 | bufPtr = buf; | |
3477 | return gTrue; | |
3478 | } |