1 /* $Id: tif_fax3.c,v 1.43.2.10 2010-06-09 17:16:58 bfriesen Exp $ */
4 * Copyright (c) 1990-1997 Sam Leffler
5 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
7 * Permission to use, copy, modify, distribute, and sell this software and
8 * its documentation for any purpose is hereby granted without fee, provided
9 * that (i) the above copyright notices and this permission notice appear in
10 * all copies of the software and related documentation, and (ii) the names of
11 * Sam Leffler and Silicon Graphics may not be used in any advertising or
12 * publicity relating to the software without the specific, prior written
13 * permission of Sam Leffler and Silicon Graphics.
15 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
17 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
19 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
20 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
21 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
22 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
23 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
32 * CCITT Group 3 (T.4) and Group 4 (T.6) Compression Support.
34 * This file contains support for decoding and encoding TIFF
35 * compression algorithms 2, 3, 4, and 32771.
37 * Decoder support is derived, with permission, from the code
38 * in Frank Cringle's viewfax program;
39 * Copyright (C) 1990, 1995 Frank D. Cringle.
47 * Compression+decompression state blocks are
48 * derived from this ``base state'' block.
51 int rw_mode; /* O_RDONLY for decode, else encode */
52 int mode; /* operating mode */
53 uint32 rowbytes; /* bytes in a decoded scanline */
54 uint32 rowpixels; /* pixels in a scanline */
56 uint16 cleanfaxdata; /* CleanFaxData tag */
57 uint32 badfaxrun; /* BadFaxRun tag */
58 uint32 badfaxlines; /* BadFaxLines tag */
59 uint32 groupoptions; /* Group 3/4 options tag */
60 uint32 recvparams; /* encoded Class 2 session params */
61 char* subaddress; /* subaddress string */
62 uint32 recvtime; /* time spent receiving (secs) */
63 char* faxdcs; /* Table 2/T.30 encoded session params */
64 TIFFVGetMethod vgetparent; /* super-class method */
65 TIFFVSetMethod vsetparent; /* super-class method */
66 TIFFPrintMethod printdir; /* super-class method */
68 #define Fax3State(tif) ((Fax3BaseState*) (tif)->tif_data)
70 typedef enum { G3_1D, G3_2D } Ttag;
74 /* Decoder state info */
75 const unsigned char* bitmap; /* bit reversal table */
76 uint32 data; /* current i/o byte/word */
77 int bit; /* current i/o bit in byte */
78 int EOLcnt; /* count of EOL codes recognized */
79 TIFFFaxFillFunc fill; /* fill routine */
80 uint32* runs; /* b&w runs for current/previous row */
81 uint32* refruns; /* runs for reference line */
82 uint32* curruns; /* runs for current line */
84 /* Encoder state info */
85 Ttag tag; /* encoding state */
86 unsigned char* refline; /* reference line for 2d decoding */
87 int k; /* #rows left that can be 2d encoded */
88 int maxk; /* max #rows that can be 2d encoded */
92 #define DecoderState(tif) ((Fax3CodecState*) Fax3State(tif))
93 #define EncoderState(tif) ((Fax3CodecState*) Fax3State(tif))
95 #define is2DEncoding(sp) \
96 (sp->b.groupoptions & GROUP3OPT_2DENCODING)
97 #define isAligned(p,t) ((((unsigned long)(p)) & (sizeof (t)-1)) == 0)
100 * Group 3 and Group 4 Decoding.
104 * These macros glue the TIFF library state to
105 * the state expected by Frank's decoder.
107 #define DECLARE_STATE(tif, sp, mod) \
108 static const char module[] = mod; \
109 Fax3CodecState* sp = DecoderState(tif); \
110 int a0; /* reference element */ \
111 int lastx = sp->b.rowpixels; /* last element in row */ \
112 uint32 BitAcc; /* bit accumulator */ \
113 int BitsAvail; /* # valid bits in BitAcc */ \
114 int RunLength; /* length of current run */ \
115 unsigned char* cp; /* next byte of input data */ \
116 unsigned char* ep; /* end of input data */ \
117 uint32* pa; /* place to stuff next run */ \
118 uint32* thisrun; /* current row's run array */ \
119 int EOLcnt; /* # EOL codes recognized */ \
120 const unsigned char* bitmap = sp->bitmap; /* input data bit reverser */ \
121 const TIFFFaxTabEnt* TabEnt
122 #define DECLARE_STATE_2D(tif, sp, mod) \
123 DECLARE_STATE(tif, sp, mod); \
124 int b1; /* next change on prev line */ \
125 uint32* pb /* next run in reference line */\
127 * Load any state that may be changed during decoding.
129 #define CACHE_STATE(tif, sp) do { \
131 BitsAvail = sp->bit; \
132 EOLcnt = sp->EOLcnt; \
133 cp = (unsigned char*) tif->tif_rawcp; \
134 ep = cp + tif->tif_rawcc; \
137 * Save state possibly changed during decoding.
139 #define UNCACHE_STATE(tif, sp) do { \
140 sp->bit = BitsAvail; \
142 sp->EOLcnt = EOLcnt; \
143 tif->tif_rawcc -= (tidata_t) cp - tif->tif_rawcp; \
144 tif->tif_rawcp = (tidata_t) cp; \
148 * Setup state for decoding a strip.
151 Fax3PreDecode(TIFF* tif, tsample_t s)
153 Fax3CodecState* sp = DecoderState(tif);
157 sp->bit = 0; /* force initial read */
159 sp->EOLcnt = 0; /* force initial scan for EOL */
161 * Decoder assumes lsb-to-msb bit order. Note that we select
162 * this here rather than in Fax3SetupState so that viewers can
163 * hold the image open, fiddle with the FillOrder tag value,
164 * and then re-decode the image. Otherwise they'd need to close
165 * and open the image to get the state reset.
168 TIFFGetBitRevTable(tif->tif_dir.td_fillorder != FILLORDER_LSB2MSB);
169 if (sp->refruns) { /* init reference line to white */
170 sp->refruns[0] = (uint32) sp->b.rowpixels;
178 * Routine for handling various errors/conditions.
179 * Note how they are "glued into the decoder" by
180 * overriding the definitions used by the decoder.
184 Fax3Unexpected(const char* module, TIFF* tif, uint32 line, uint32 a0)
186 TIFFErrorExt(tif->tif_clientdata, module, "%s: Bad code word at line %u of %s %u (x %u)",
187 tif->tif_name, line, isTiled(tif) ? "tile" : "strip",
188 (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip),
191 #define unexpected(table, a0) Fax3Unexpected(module, tif, sp->line, a0)
194 Fax3Extension(const char* module, TIFF* tif, uint32 line, uint32 a0)
196 TIFFErrorExt(tif->tif_clientdata, module,
197 "%s: Uncompressed data (not supported) at line %u of %s %u (x %u)",
198 tif->tif_name, line, isTiled(tif) ? "tile" : "strip",
199 (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip),
202 #define extension(a0) Fax3Extension(module, tif, sp->line, a0)
205 Fax3BadLength(const char* module, TIFF* tif, uint32 line, uint32 a0, uint32 lastx)
207 TIFFWarningExt(tif->tif_clientdata, module, "%s: %s at line %u of %s %u (got %u, expected %u)",
209 a0 < lastx ? "Premature EOL" : "Line length mismatch",
210 line, isTiled(tif) ? "tile" : "strip",
211 (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip),
214 #define badlength(a0,lastx) Fax3BadLength(module, tif, sp->line, a0, lastx)
217 Fax3PrematureEOF(const char* module, TIFF* tif, uint32 line, uint32 a0)
219 TIFFWarningExt(tif->tif_clientdata, module, "%s: Premature EOF at line %u of %s %u (x %u)",
221 line, isTiled(tif) ? "tile" : "strip",
222 (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip),
225 #define prematureEOF(a0) Fax3PrematureEOF(module, tif, sp->line, a0)
230 * Decode the requested amount of G3 1D-encoded data.
233 Fax3Decode1D(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
235 DECLARE_STATE(tif, sp, "Fax3Decode1D");
238 CACHE_STATE(tif, sp);
239 thisrun = sp->curruns;
240 while ((long)occ > 0) {
245 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail);
246 printf("-------------------- %d\n", tif->tif_row);
251 (*sp->fill)(buf, thisrun, pa, lastx);
252 buf += sp->b.rowbytes;
253 occ -= sp->b.rowbytes;
256 EOF1D: /* premature EOF */
258 EOF1Da: /* premature EOF */
259 (*sp->fill)(buf, thisrun, pa, lastx);
260 UNCACHE_STATE(tif, sp);
263 UNCACHE_STATE(tif, sp);
267 #define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; }
269 * Decode the requested amount of G3 2D-encoded data.
272 Fax3Decode2D(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
274 DECLARE_STATE_2D(tif, sp, "Fax3Decode2D");
275 int is1D; /* current line is 1d/2d-encoded */
278 CACHE_STATE(tif, sp);
279 while ((long)occ > 0) {
282 pa = thisrun = sp->curruns;
284 printf("\nBitAcc=%08X, BitsAvail = %d EOLcnt = %d",
285 BitAcc, BitsAvail, EOLcnt);
289 is1D = GetBits(1); /* 1D/2D-encoding tag bit */
292 printf(" %s\n-------------------- %d\n",
293 is1D ? "1D" : "2D", tif->tif_row);
302 (*sp->fill)(buf, thisrun, pa, lastx);
303 SETVALUE(0); /* imaginary change for reference */
304 SWAP(uint32*, sp->curruns, sp->refruns);
305 buf += sp->b.rowbytes;
306 occ -= sp->b.rowbytes;
309 EOF2D: /* premature EOF */
311 EOF2Da: /* premature EOF */
312 (*sp->fill)(buf, thisrun, pa, lastx);
313 UNCACHE_STATE(tif, sp);
316 UNCACHE_STATE(tif, sp);
322 * The ZERO & FILL macros must handle spans < 2*sizeof(long) bytes.
323 * For machines with 64-bit longs this is <16 bytes; otherwise
324 * this is <8 bytes. We optimize the code here to reflect the
325 * machine characteristics.
328 # define FILL(n, cp) \
330 case 15:(cp)[14] = 0xff; case 14:(cp)[13] = 0xff; case 13: (cp)[12] = 0xff;\
331 case 12:(cp)[11] = 0xff; case 11:(cp)[10] = 0xff; case 10: (cp)[9] = 0xff;\
332 case 9: (cp)[8] = 0xff; case 8: (cp)[7] = 0xff; case 7: (cp)[6] = 0xff;\
333 case 6: (cp)[5] = 0xff; case 5: (cp)[4] = 0xff; case 4: (cp)[3] = 0xff;\
334 case 3: (cp)[2] = 0xff; case 2: (cp)[1] = 0xff; \
335 case 1: (cp)[0] = 0xff; (cp) += (n); case 0: ; \
337 # define ZERO(n, cp) \
339 case 15:(cp)[14] = 0; case 14:(cp)[13] = 0; case 13: (cp)[12] = 0; \
340 case 12:(cp)[11] = 0; case 11:(cp)[10] = 0; case 10: (cp)[9] = 0; \
341 case 9: (cp)[8] = 0; case 8: (cp)[7] = 0; case 7: (cp)[6] = 0; \
342 case 6: (cp)[5] = 0; case 5: (cp)[4] = 0; case 4: (cp)[3] = 0; \
343 case 3: (cp)[2] = 0; case 2: (cp)[1] = 0; \
344 case 1: (cp)[0] = 0; (cp) += (n); case 0: ; \
347 # define FILL(n, cp) \
349 case 7: (cp)[6] = 0xff; case 6: (cp)[5] = 0xff; case 5: (cp)[4] = 0xff; \
350 case 4: (cp)[3] = 0xff; case 3: (cp)[2] = 0xff; case 2: (cp)[1] = 0xff; \
351 case 1: (cp)[0] = 0xff; (cp) += (n); case 0: ; \
353 # define ZERO(n, cp) \
355 case 7: (cp)[6] = 0; case 6: (cp)[5] = 0; case 5: (cp)[4] = 0; \
356 case 4: (cp)[3] = 0; case 3: (cp)[2] = 0; case 2: (cp)[1] = 0; \
357 case 1: (cp)[0] = 0; (cp) += (n); case 0: ; \
362 * Bit-fill a row according to the white/black
363 * runs generated during G3/G4 decoding.
366 _TIFFFax3fillruns(unsigned char* buf, uint32* runs, uint32* erun, uint32 lastx)
368 static const unsigned char _fillmasks[] =
369 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
378 for (; runs < erun; runs += 2) {
380 if (x+run > lastx || run > lastx )
381 run = runs[0] = (uint32) (lastx - x);
386 if (bx) { /* align to byte boundary */
387 *cp++ &= 0xff << (8-bx);
390 if( (n = run >> 3) != 0 ) { /* multiple bytes to fill */
391 if ((n/sizeof (long)) > 1) {
393 * Align to longword boundary and fill.
395 for (; n && !isAligned(cp, long); n--)
398 nw = (int32)(n / sizeof (long));
399 n -= nw * sizeof (long);
403 cp = (unsigned char*) lp;
409 cp[0] &= 0xff >> run;
411 cp[0] &= ~(_fillmasks[run]>>bx);
415 if (x+run > lastx || run > lastx )
416 run = runs[1] = lastx - x;
421 if (bx) { /* align to byte boundary */
425 if( (n = run>>3) != 0 ) { /* multiple bytes to fill */
426 if ((n/sizeof (long)) > 1) {
428 * Align to longword boundary and fill.
430 for (; n && !isAligned(cp, long); n--)
433 nw = (int32)(n / sizeof (long));
434 n -= nw * sizeof (long);
438 cp = (unsigned char*) lp;
444 cp[0] |= 0xff00 >> run;
446 cp[0] |= _fillmasks[run]>>bx;
456 * Setup G3/G4-related compression/decompression state
457 * before data is processed. This routine is called once
458 * per image -- it sets up different state based on whether
459 * or not decoding or encoding is being done and whether
460 * 1D- or 2D-encoded data is involved.
463 Fax3SetupState(TIFF* tif)
465 TIFFDirectory* td = &tif->tif_dir;
466 Fax3BaseState* sp = Fax3State(tif);
468 Fax3CodecState* dsp = (Fax3CodecState*) Fax3State(tif);
469 uint32 rowbytes, rowpixels, nruns;
471 if (td->td_bitspersample != 1) {
472 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
473 "Bits/sample must be 1 for Group 3/4 encoding/decoding");
477 * Calculate the scanline/tile widths.
480 rowbytes = TIFFTileRowSize(tif);
481 rowpixels = td->td_tilewidth;
483 rowbytes = TIFFScanlineSize(tif);
484 rowpixels = td->td_imagewidth;
486 sp->rowbytes = (uint32) rowbytes;
487 sp->rowpixels = (uint32) rowpixels;
489 * Allocate any additional space required for decoding/encoding.
492 (sp->groupoptions & GROUP3OPT_2DENCODING) ||
493 td->td_compression == COMPRESSION_CCITTFAX4
497 Assure that allocation computations do not overflow.
499 TIFFroundup and TIFFSafeMultiply return zero on integer overflow
501 dsp->runs=(uint32*) NULL;
502 nruns = TIFFroundup(rowpixels,32);
504 nruns = TIFFSafeMultiply(uint32,nruns,2);
506 if ((nruns == 0) || (TIFFSafeMultiply(uint32,nruns,2) == 0)) {
507 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
508 "Row pixels integer overflow (rowpixels %u)",
512 dsp->runs = (uint32*) _TIFFCheckMalloc(tif,
513 TIFFSafeMultiply(uint32,nruns,2),
515 "for Group 3/4 run arrays");
516 if (dsp->runs == NULL)
518 dsp->curruns = dsp->runs;
520 dsp->refruns = dsp->runs + nruns;
523 if (td->td_compression == COMPRESSION_CCITTFAX3
524 && is2DEncoding(dsp)) { /* NB: default is 1D routine */
525 tif->tif_decoderow = Fax3Decode2D;
526 tif->tif_decodestrip = Fax3Decode2D;
527 tif->tif_decodetile = Fax3Decode2D;
530 if (needsRefLine) { /* 2d encoding */
531 Fax3CodecState* esp = EncoderState(tif);
533 * 2d encoding requires a scanline
534 * buffer for the ``reference line''; the
535 * scanline against which delta encoding
536 * is referenced. The reference line must
537 * be initialized to be ``white'' (done elsewhere).
539 esp->refline = (unsigned char*) _TIFFmalloc(rowbytes);
540 if (esp->refline == NULL) {
541 TIFFErrorExt(tif->tif_clientdata, "Fax3SetupState",
542 "%s: No space for Group 3/4 reference line",
546 } else /* 1d encoding */
547 EncoderState(tif)->refline = NULL;
553 * CCITT Group 3 FAX Encoding.
556 #define Fax3FlushBits(tif, sp) { \
557 if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
558 (void) TIFFFlushData1(tif); \
559 *(tif)->tif_rawcp++ = (tidataval_t) (sp)->data; \
560 (tif)->tif_rawcc++; \
561 (sp)->data = 0, (sp)->bit = 8; \
563 #define _FlushBits(tif) { \
564 if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
565 (void) TIFFFlushData1(tif); \
566 *(tif)->tif_rawcp++ = (tidataval_t) data; \
567 (tif)->tif_rawcc++; \
570 static const int _msbmask[9] =
571 { 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff };
572 #define _PutBits(tif, bits, length) { \
573 while (length > bit) { \
574 data |= bits >> (length - bit); \
578 data |= (bits & _msbmask[length]) << (bit - length); \
585 * Write a variable-length bit-value to
586 * the output stream. Values are
587 * assumed to be at most 16 bits.
590 Fax3PutBits(TIFF* tif, unsigned int bits, unsigned int length)
592 Fax3CodecState* sp = EncoderState(tif);
593 unsigned int bit = sp->bit;
596 _PutBits(tif, bits, length);
603 * Write a code to the output stream.
605 #define putcode(tif, te) Fax3PutBits(tif, (te)->code, (te)->length)
608 #define DEBUG_COLOR(w) (tab == TIFFFaxWhiteCodes ? w "W" : w "B")
609 #define DEBUG_PRINT(what,len) { \
611 printf("%08X/%-2d: %s%5d\t", data, bit, DEBUG_COLOR(what), len); \
612 for (t = length-1; t >= 0; t--) \
613 putchar(code & (1<<t) ? '1' : '0'); \
619 * Write the sequence of codes that describes
620 * the specified span of zero's or one's. The
621 * appropriate table that holds the make-up and
622 * terminating codes is supplied.
625 putspan(TIFF* tif, int32 span, const tableentry* tab)
627 Fax3CodecState* sp = EncoderState(tif);
628 unsigned int bit = sp->bit;
630 unsigned int code, length;
632 while (span >= 2624) {
633 const tableentry* te = &tab[63 + (2560>>6)];
634 code = te->code, length = te->length;
636 DEBUG_PRINT("MakeUp", te->runlen);
638 _PutBits(tif, code, length);
642 const tableentry* te = &tab[63 + (span>>6)];
643 assert(te->runlen == 64*(span>>6));
644 code = te->code, length = te->length;
646 DEBUG_PRINT("MakeUp", te->runlen);
648 _PutBits(tif, code, length);
651 code = tab[span].code, length = tab[span].length;
653 DEBUG_PRINT(" Term", tab[span].runlen);
655 _PutBits(tif, code, length);
662 * Write an EOL code to the output stream. The zero-fill
663 * logic for byte-aligning encoded scanlines is handled
664 * here. We also handle writing the tag bit for the next
665 * scanline when doing 2d encoding.
668 Fax3PutEOL(TIFF* tif)
670 Fax3CodecState* sp = EncoderState(tif);
671 unsigned int bit = sp->bit;
673 unsigned int code, length, tparm;
675 if (sp->b.groupoptions & GROUP3OPT_FILLBITS) {
677 * Force bit alignment so EOL will terminate on
678 * a byte boundary. That is, force the bit alignment
679 * to 16-12 = 4 before putting out the EOL code.
682 if (align != sp->bit) {
684 align = sp->bit + (8 - align);
686 align = sp->bit - align;
689 _PutBits(tif, 0, tparm);
692 code = EOL, length = 12;
693 if (is2DEncoding(sp))
694 code = (code<<1) | (sp->tag == G3_1D), length++;
695 _PutBits(tif, code, length);
702 * Reset encoding state at the start of a strip.
705 Fax3PreEncode(TIFF* tif, tsample_t s)
707 Fax3CodecState* sp = EncoderState(tif);
715 * This is necessary for Group 4; otherwise it isn't
716 * needed because the first scanline of each strip ends
717 * up being copied into the refline.
720 _TIFFmemset(sp->refline, 0x00, sp->b.rowbytes);
721 if (is2DEncoding(sp)) {
722 float res = tif->tif_dir.td_yresolution;
724 * The CCITT spec says that when doing 2d encoding, you
725 * should only do it on K consecutive scanlines, where K
726 * depends on the resolution of the image being encoded
727 * (2 for <= 200 lpi, 4 for > 200 lpi). Since the directory
728 * code initializes td_yresolution to 0, this code will
729 * select a K of 2 unless the YResolution tag is set
730 * appropriately. (Note also that we fudge a little here
731 * and use 150 lpi to avoid problems with units conversion.)
733 if (tif->tif_dir.td_resolutionunit == RESUNIT_CENTIMETER)
734 res *= 2.54f; /* convert to inches */
735 sp->maxk = (res > 150 ? 4 : 2);
738 sp->k = sp->maxk = 0;
743 static const unsigned char zeroruns[256] = {
744 8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, /* 0x00 - 0x0f */
745 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0x10 - 0x1f */
746 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x20 - 0x2f */
747 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x30 - 0x3f */
748 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x40 - 0x4f */
749 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x50 - 0x5f */
750 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x60 - 0x6f */
751 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x70 - 0x7f */
752 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x80 - 0x8f */
753 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x90 - 0x9f */
754 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xa0 - 0xaf */
755 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xb0 - 0xbf */
756 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xc0 - 0xcf */
757 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xd0 - 0xdf */
758 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xe0 - 0xef */
759 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xf0 - 0xff */
761 static const unsigned char oneruns[256] = {
762 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x00 - 0x0f */
763 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x10 - 0x1f */
764 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x20 - 0x2f */
765 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x30 - 0x3f */
766 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x40 - 0x4f */
767 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x50 - 0x5f */
768 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x60 - 0x6f */
769 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x70 - 0x7f */
770 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x80 - 0x8f */
771 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x90 - 0x9f */
772 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xa0 - 0xaf */
773 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xb0 - 0xbf */
774 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xc0 - 0xcf */
775 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xd0 - 0xdf */
776 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0xe0 - 0xef */
777 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 8, /* 0xf0 - 0xff */
781 * On certain systems it pays to inline
782 * the routines that find pixel spans.
785 static int32 find0span(unsigned char*, int32, int32);
786 static int32 find1span(unsigned char*, int32, int32);
787 #pragma inline(find0span,find1span)
791 * Find a span of ones or zeros using the supplied
792 * table. The ``base'' of the bit string is supplied
793 * along with the start+end bit indices.
796 find0span(unsigned char* bp, int32 bs, int32 be)
798 int32 bits = be - bs;
803 * Check partial byte on lhs.
805 if (bits > 0 && (n = (bs & 7))) {
806 span = zeroruns[(*bp << n) & 0xff];
807 if (span > 8-n) /* table value too generous */
809 if (span > bits) /* constrain span to bit range */
811 if (n+span < 8) /* doesn't extend to edge of byte */
817 if (bits >= (int32)(2 * 8 * sizeof(long))) {
820 * Align to longword boundary and check longwords.
822 while (!isAligned(bp, long)) {
824 return (span + zeroruns[*bp]);
825 span += 8, bits -= 8;
829 while ((bits >= (int32)(8 * sizeof(long))) && (0 == *lp)) {
830 span += 8*sizeof (long), bits -= 8*sizeof (long);
833 bp = (unsigned char*) lp;
836 * Scan full bytes for all 0's.
839 if (*bp != 0x00) /* end of run */
840 return (span + zeroruns[*bp]);
841 span += 8, bits -= 8;
845 * Check partial byte on rhs.
849 span += (n > bits ? bits : n);
855 find1span(unsigned char* bp, int32 bs, int32 be)
857 int32 bits = be - bs;
862 * Check partial byte on lhs.
864 if (bits > 0 && (n = (bs & 7))) {
865 span = oneruns[(*bp << n) & 0xff];
866 if (span > 8-n) /* table value too generous */
868 if (span > bits) /* constrain span to bit range */
870 if (n+span < 8) /* doesn't extend to edge of byte */
876 if (bits >= (int32)(2 * 8 * sizeof(long))) {
879 * Align to longword boundary and check longwords.
881 while (!isAligned(bp, long)) {
883 return (span + oneruns[*bp]);
884 span += 8, bits -= 8;
888 while ((bits >= (int32)(8 * sizeof(long))) && (~0 == *lp)) {
889 span += 8*sizeof (long), bits -= 8*sizeof (long);
892 bp = (unsigned char*) lp;
895 * Scan full bytes for all 1's.
898 if (*bp != 0xff) /* end of run */
899 return (span + oneruns[*bp]);
900 span += 8, bits -= 8;
904 * Check partial byte on rhs.
908 span += (n > bits ? bits : n);
914 * Return the offset of the next bit in the range
915 * [bs..be] that is different from the specified
916 * color. The end, be, is returned if no such bit
919 #define finddiff(_cp, _bs, _be, _color) \
920 (_bs + (_color ? find1span(_cp,_bs,_be) : find0span(_cp,_bs,_be)))
922 * Like finddiff, but also check the starting bit
923 * against the end in case start > end.
925 #define finddiff2(_cp, _bs, _be, _color) \
926 (_bs < _be ? finddiff(_cp,_bs,_be,_color) : _be)
929 * 1d-encode a row of pixels. The encoding is
930 * a sequence of all-white or all-black spans
931 * of pixels encoded with Huffman codes.
934 Fax3Encode1DRow(TIFF* tif, unsigned char* bp, uint32 bits)
936 Fax3CodecState* sp = EncoderState(tif);
941 span = find0span(bp, bs, bits); /* white span */
942 putspan(tif, span, TIFFFaxWhiteCodes);
946 span = find1span(bp, bs, bits); /* black span */
947 putspan(tif, span, TIFFFaxBlackCodes);
952 if (sp->b.mode & (FAXMODE_BYTEALIGN|FAXMODE_WORDALIGN)) {
953 if (sp->bit != 8) /* byte-align */
954 Fax3FlushBits(tif, sp);
955 if ((sp->b.mode&FAXMODE_WORDALIGN) &&
956 !isAligned(tif->tif_rawcp, uint16))
957 Fax3FlushBits(tif, sp);
962 static const tableentry horizcode =
963 { 3, 0x1, 0 }; /* 001 */
964 static const tableentry passcode =
965 { 4, 0x1, 0 }; /* 0001 */
966 static const tableentry vcodes[7] = {
967 { 7, 0x03, 0 }, /* 0000 011 */
968 { 6, 0x03, 0 }, /* 0000 11 */
969 { 3, 0x03, 0 }, /* 011 */
970 { 1, 0x1, 0 }, /* 1 */
971 { 3, 0x2, 0 }, /* 010 */
972 { 6, 0x02, 0 }, /* 0000 10 */
973 { 7, 0x02, 0 } /* 0000 010 */
977 * 2d-encode a row of pixels. Consult the CCITT
978 * documentation for the algorithm.
981 Fax3Encode2DRow(TIFF* tif, unsigned char* bp, unsigned char* rp, uint32 bits)
983 #define PIXEL(buf,ix) ((((buf)[(ix)>>3]) >> (7-((ix)&7))) & 1)
985 uint32 a1 = (PIXEL(bp, 0) != 0 ? 0 : finddiff(bp, 0, bits, 0));
986 uint32 b1 = (PIXEL(rp, 0) != 0 ? 0 : finddiff(rp, 0, bits, 0));
990 b2 = finddiff2(rp, b1, bits, PIXEL(rp,b1));
993 if (!(-3 <= d && d <= 3)) { /* horizontal mode */
994 a2 = finddiff2(bp, a1, bits, PIXEL(bp,a1));
995 putcode(tif, &horizcode);
996 if (a0+a1 == 0 || PIXEL(bp, a0) == 0) {
997 putspan(tif, a1-a0, TIFFFaxWhiteCodes);
998 putspan(tif, a2-a1, TIFFFaxBlackCodes);
1000 putspan(tif, a1-a0, TIFFFaxBlackCodes);
1001 putspan(tif, a2-a1, TIFFFaxWhiteCodes);
1004 } else { /* vertical mode */
1005 putcode(tif, &vcodes[d+3]);
1008 } else { /* pass mode */
1009 putcode(tif, &passcode);
1014 a1 = finddiff(bp, a0, bits, PIXEL(bp,a0));
1015 b1 = finddiff(rp, a0, bits, !PIXEL(bp,a0));
1016 b1 = finddiff(rp, b1, bits, PIXEL(bp,a0));
1023 * Encode a buffer of pixels.
1026 Fax3Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
1028 Fax3CodecState* sp = EncoderState(tif);
1031 while ((long)cc > 0) {
1032 if ((sp->b.mode & FAXMODE_NOEOL) == 0)
1034 if (is2DEncoding(sp)) {
1035 if (sp->tag == G3_1D) {
1036 if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels))
1040 if (!Fax3Encode2DRow(tif, bp, sp->refline,
1049 _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes);
1051 if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels))
1054 bp += sp->b.rowbytes;
1055 cc -= sp->b.rowbytes;
1061 Fax3PostEncode(TIFF* tif)
1063 Fax3CodecState* sp = EncoderState(tif);
1066 Fax3FlushBits(tif, sp);
1071 Fax3Close(TIFF* tif)
1073 if ((Fax3State(tif)->mode & FAXMODE_NORTC) == 0) {
1074 Fax3CodecState* sp = EncoderState(tif);
1075 unsigned int code = EOL;
1076 unsigned int length = 12;
1079 if (is2DEncoding(sp))
1080 code = (code<<1) | (sp->tag == G3_1D), length++;
1081 for (i = 0; i < 6; i++)
1082 Fax3PutBits(tif, code, length);
1083 Fax3FlushBits(tif, sp);
1088 Fax3Cleanup(TIFF* tif)
1090 Fax3CodecState* sp = DecoderState(tif);
1094 tif->tif_tagmethods.vgetfield = sp->b.vgetparent;
1095 tif->tif_tagmethods.vsetfield = sp->b.vsetparent;
1096 tif->tif_tagmethods.printdir = sp->b.printdir;
1099 _TIFFfree(sp->runs);
1101 _TIFFfree(sp->refline);
1103 if (Fax3State(tif)->subaddress)
1104 _TIFFfree(Fax3State(tif)->subaddress);
1105 if (Fax3State(tif)->faxdcs)
1106 _TIFFfree(Fax3State(tif)->faxdcs);
1108 _TIFFfree(tif->tif_data);
1109 tif->tif_data = NULL;
1111 _TIFFSetDefaultCompressionState(tif);
1114 #define FIELD_BADFAXLINES (FIELD_CODEC+0)
1115 #define FIELD_CLEANFAXDATA (FIELD_CODEC+1)
1116 #define FIELD_BADFAXRUN (FIELD_CODEC+2)
1117 #define FIELD_RECVPARAMS (FIELD_CODEC+3)
1118 #define FIELD_SUBADDRESS (FIELD_CODEC+4)
1119 #define FIELD_RECVTIME (FIELD_CODEC+5)
1120 #define FIELD_FAXDCS (FIELD_CODEC+6)
1122 #define FIELD_OPTIONS (FIELD_CODEC+7)
1124 static const TIFFFieldInfo faxFieldInfo[] = {
1125 { TIFFTAG_FAXMODE, 0, 0, TIFF_ANY, FIELD_PSEUDO,
1126 FALSE, FALSE, "FaxMode" },
1127 { TIFFTAG_FAXFILLFUNC, 0, 0, TIFF_ANY, FIELD_PSEUDO,
1128 FALSE, FALSE, "FaxFillFunc" },
1129 { TIFFTAG_BADFAXLINES, 1, 1, TIFF_LONG, FIELD_BADFAXLINES,
1130 TRUE, FALSE, "BadFaxLines" },
1131 { TIFFTAG_BADFAXLINES, 1, 1, TIFF_SHORT, FIELD_BADFAXLINES,
1132 TRUE, FALSE, "BadFaxLines" },
1133 { TIFFTAG_CLEANFAXDATA, 1, 1, TIFF_SHORT, FIELD_CLEANFAXDATA,
1134 TRUE, FALSE, "CleanFaxData" },
1135 { TIFFTAG_CONSECUTIVEBADFAXLINES,1,1, TIFF_LONG, FIELD_BADFAXRUN,
1136 TRUE, FALSE, "ConsecutiveBadFaxLines" },
1137 { TIFFTAG_CONSECUTIVEBADFAXLINES,1,1, TIFF_SHORT, FIELD_BADFAXRUN,
1138 TRUE, FALSE, "ConsecutiveBadFaxLines" },
1139 { TIFFTAG_FAXRECVPARAMS, 1, 1, TIFF_LONG, FIELD_RECVPARAMS,
1140 TRUE, FALSE, "FaxRecvParams" },
1141 { TIFFTAG_FAXSUBADDRESS, -1,-1, TIFF_ASCII, FIELD_SUBADDRESS,
1142 TRUE, FALSE, "FaxSubAddress" },
1143 { TIFFTAG_FAXRECVTIME, 1, 1, TIFF_LONG, FIELD_RECVTIME,
1144 TRUE, FALSE, "FaxRecvTime" },
1145 { TIFFTAG_FAXDCS, -1,-1, TIFF_ASCII, FIELD_FAXDCS,
1146 TRUE, FALSE, "FaxDcs" },
1148 static const TIFFFieldInfo fax3FieldInfo[] = {
1149 { TIFFTAG_GROUP3OPTIONS, 1, 1, TIFF_LONG, FIELD_OPTIONS,
1150 FALSE, FALSE, "Group3Options" },
1152 static const TIFFFieldInfo fax4FieldInfo[] = {
1153 { TIFFTAG_GROUP4OPTIONS, 1, 1, TIFF_LONG, FIELD_OPTIONS,
1154 FALSE, FALSE, "Group4Options" },
1156 #define N(a) (sizeof (a) / sizeof (a[0]))
1159 Fax3VSetField(TIFF* tif, ttag_t tag, va_list ap)
1161 Fax3BaseState* sp = Fax3State(tif);
1162 const TIFFFieldInfo* fip;
1165 assert(sp->vsetparent != 0);
1168 case TIFFTAG_FAXMODE:
1169 sp->mode = va_arg(ap, int);
1170 return 1; /* NB: pseudo tag */
1171 case TIFFTAG_FAXFILLFUNC:
1172 DecoderState(tif)->fill = va_arg(ap, TIFFFaxFillFunc);
1173 return 1; /* NB: pseudo tag */
1174 case TIFFTAG_GROUP3OPTIONS:
1175 /* XXX: avoid reading options if compression mismatches. */
1176 if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX3)
1177 sp->groupoptions = va_arg(ap, uint32);
1179 case TIFFTAG_GROUP4OPTIONS:
1180 /* XXX: avoid reading options if compression mismatches. */
1181 if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4)
1182 sp->groupoptions = va_arg(ap, uint32);
1184 case TIFFTAG_BADFAXLINES:
1185 sp->badfaxlines = va_arg(ap, uint32);
1187 case TIFFTAG_CLEANFAXDATA:
1188 sp->cleanfaxdata = (uint16) va_arg(ap, int);
1190 case TIFFTAG_CONSECUTIVEBADFAXLINES:
1191 sp->badfaxrun = va_arg(ap, uint32);
1193 case TIFFTAG_FAXRECVPARAMS:
1194 sp->recvparams = va_arg(ap, uint32);
1196 case TIFFTAG_FAXSUBADDRESS:
1197 _TIFFsetString(&sp->subaddress, va_arg(ap, char*));
1199 case TIFFTAG_FAXRECVTIME:
1200 sp->recvtime = va_arg(ap, uint32);
1202 case TIFFTAG_FAXDCS:
1203 _TIFFsetString(&sp->faxdcs, va_arg(ap, char*));
1206 return (*sp->vsetparent)(tif, tag, ap);
1209 if ((fip = _TIFFFieldWithTag(tif, tag)))
1210 TIFFSetFieldBit(tif, fip->field_bit);
1214 tif->tif_flags |= TIFF_DIRTYDIRECT;
1219 Fax3VGetField(TIFF* tif, ttag_t tag, va_list ap)
1221 Fax3BaseState* sp = Fax3State(tif);
1226 case TIFFTAG_FAXMODE:
1227 *va_arg(ap, int*) = sp->mode;
1229 case TIFFTAG_FAXFILLFUNC:
1230 *va_arg(ap, TIFFFaxFillFunc*) = DecoderState(tif)->fill;
1232 case TIFFTAG_GROUP3OPTIONS:
1233 case TIFFTAG_GROUP4OPTIONS:
1234 *va_arg(ap, uint32*) = sp->groupoptions;
1236 case TIFFTAG_BADFAXLINES:
1237 *va_arg(ap, uint32*) = sp->badfaxlines;
1239 case TIFFTAG_CLEANFAXDATA:
1240 *va_arg(ap, uint16*) = sp->cleanfaxdata;
1242 case TIFFTAG_CONSECUTIVEBADFAXLINES:
1243 *va_arg(ap, uint32*) = sp->badfaxrun;
1245 case TIFFTAG_FAXRECVPARAMS:
1246 *va_arg(ap, uint32*) = sp->recvparams;
1248 case TIFFTAG_FAXSUBADDRESS:
1249 *va_arg(ap, char**) = sp->subaddress;
1251 case TIFFTAG_FAXRECVTIME:
1252 *va_arg(ap, uint32*) = sp->recvtime;
1254 case TIFFTAG_FAXDCS:
1255 *va_arg(ap, char**) = sp->faxdcs;
1258 return (*sp->vgetparent)(tif, tag, ap);
1264 Fax3PrintDir(TIFF* tif, FILE* fd, long flags)
1266 Fax3BaseState* sp = Fax3State(tif);
1271 if (TIFFFieldSet(tif,FIELD_OPTIONS)) {
1272 const char* sep = " ";
1273 if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4) {
1274 fprintf(fd, " Group 4 Options:");
1275 if (sp->groupoptions & GROUP4OPT_UNCOMPRESSED)
1276 fprintf(fd, "%suncompressed data", sep);
1279 fprintf(fd, " Group 3 Options:");
1280 if (sp->groupoptions & GROUP3OPT_2DENCODING)
1281 fprintf(fd, "%s2-d encoding", sep), sep = "+";
1282 if (sp->groupoptions & GROUP3OPT_FILLBITS)
1283 fprintf(fd, "%sEOL padding", sep), sep = "+";
1284 if (sp->groupoptions & GROUP3OPT_UNCOMPRESSED)
1285 fprintf(fd, "%suncompressed data", sep);
1287 fprintf(fd, " (%lu = 0x%lx)\n",
1288 (unsigned long) sp->groupoptions,
1289 (unsigned long) sp->groupoptions);
1291 if (TIFFFieldSet(tif,FIELD_CLEANFAXDATA)) {
1292 fprintf(fd, " Fax Data:");
1293 switch (sp->cleanfaxdata) {
1294 case CLEANFAXDATA_CLEAN:
1295 fprintf(fd, " clean");
1297 case CLEANFAXDATA_REGENERATED:
1298 fprintf(fd, " receiver regenerated");
1300 case CLEANFAXDATA_UNCLEAN:
1301 fprintf(fd, " uncorrected errors");
1304 fprintf(fd, " (%u = 0x%x)\n",
1305 sp->cleanfaxdata, sp->cleanfaxdata);
1307 if (TIFFFieldSet(tif,FIELD_BADFAXLINES))
1308 fprintf(fd, " Bad Fax Lines: %lu\n",
1309 (unsigned long) sp->badfaxlines);
1310 if (TIFFFieldSet(tif,FIELD_BADFAXRUN))
1311 fprintf(fd, " Consecutive Bad Fax Lines: %lu\n",
1312 (unsigned long) sp->badfaxrun);
1313 if (TIFFFieldSet(tif,FIELD_RECVPARAMS))
1314 fprintf(fd, " Fax Receive Parameters: %08lx\n",
1315 (unsigned long) sp->recvparams);
1316 if (TIFFFieldSet(tif,FIELD_SUBADDRESS))
1317 fprintf(fd, " Fax SubAddress: %s\n", sp->subaddress);
1318 if (TIFFFieldSet(tif,FIELD_RECVTIME))
1319 fprintf(fd, " Fax Receive Time: %lu secs\n",
1320 (unsigned long) sp->recvtime);
1321 if (TIFFFieldSet(tif,FIELD_FAXDCS))
1322 fprintf(fd, " Fax DCS: %s\n", sp->faxdcs);
1326 InitCCITTFax3(TIFF* tif)
1331 * Merge codec-specific tag information.
1333 if (!_TIFFMergeFieldInfo(tif, faxFieldInfo, N(faxFieldInfo))) {
1334 TIFFErrorExt(tif->tif_clientdata, "InitCCITTFax3",
1335 "Merging common CCITT Fax codec-specific tags failed");
1340 * Allocate state block so tag methods have storage to record values.
1342 tif->tif_data = (tidata_t)
1343 _TIFFmalloc(sizeof (Fax3CodecState));
1345 if (tif->tif_data == NULL) {
1346 TIFFErrorExt(tif->tif_clientdata, "TIFFInitCCITTFax3",
1347 "%s: No space for state block", tif->tif_name);
1351 sp = Fax3State(tif);
1352 sp->rw_mode = tif->tif_mode;
1355 * Override parent get/set field methods.
1357 sp->vgetparent = tif->tif_tagmethods.vgetfield;
1358 tif->tif_tagmethods.vgetfield = Fax3VGetField; /* hook for codec tags */
1359 sp->vsetparent = tif->tif_tagmethods.vsetfield;
1360 tif->tif_tagmethods.vsetfield = Fax3VSetField; /* hook for codec tags */
1361 sp->printdir = tif->tif_tagmethods.printdir;
1362 tif->tif_tagmethods.printdir = Fax3PrintDir; /* hook for codec tags */
1363 sp->groupoptions = 0;
1365 sp->subaddress = NULL;
1368 if (sp->rw_mode == O_RDONLY) /* FIXME: improve for in place update */
1369 tif->tif_flags |= TIFF_NOBITREV; /* decoder does bit reversal */
1370 DecoderState(tif)->runs = NULL;
1371 TIFFSetField(tif, TIFFTAG_FAXFILLFUNC, _TIFFFax3fillruns);
1372 EncoderState(tif)->refline = NULL;
1375 * Install codec methods.
1377 tif->tif_setupdecode = Fax3SetupState;
1378 tif->tif_predecode = Fax3PreDecode;
1379 tif->tif_decoderow = Fax3Decode1D;
1380 tif->tif_decodestrip = Fax3Decode1D;
1381 tif->tif_decodetile = Fax3Decode1D;
1382 tif->tif_setupencode = Fax3SetupState;
1383 tif->tif_preencode = Fax3PreEncode;
1384 tif->tif_postencode = Fax3PostEncode;
1385 tif->tif_encoderow = Fax3Encode;
1386 tif->tif_encodestrip = Fax3Encode;
1387 tif->tif_encodetile = Fax3Encode;
1388 tif->tif_close = Fax3Close;
1389 tif->tif_cleanup = Fax3Cleanup;
1395 TIFFInitCCITTFax3(TIFF* tif, int scheme)
1398 if (InitCCITTFax3(tif)) {
1400 * Merge codec-specific tag information.
1402 if (!_TIFFMergeFieldInfo(tif, fax3FieldInfo, N(fax3FieldInfo))) {
1403 TIFFErrorExt(tif->tif_clientdata, "TIFFInitCCITTFax3",
1404 "Merging CCITT Fax 3 codec-specific tags failed");
1409 * The default format is Class/F-style w/o RTC.
1411 return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_CLASSF);
1417 * CCITT Group 4 (T.6) Facsimile-compatible
1418 * Compression Scheme Support.
1421 #define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; }
1423 * Decode the requested amount of G4-encoded data.
1426 Fax4Decode(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
1428 DECLARE_STATE_2D(tif, sp, "Fax4Decode");
1431 CACHE_STATE(tif, sp);
1432 while ((long)occ > 0) {
1435 pa = thisrun = sp->curruns;
1439 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail);
1440 printf("-------------------- %d\n", tif->tif_row);
1446 (*sp->fill)(buf, thisrun, pa, lastx);
1447 SETVALUE(0); /* imaginary change for reference */
1448 SWAP(uint32*, sp->curruns, sp->refruns);
1449 buf += sp->b.rowbytes;
1450 occ -= sp->b.rowbytes;
1454 NeedBits16( 13, BADG4 );
1457 if( GetBits(13) != 0x1001 )
1458 fputs( "Bad EOFB\n", stderr );
1461 (*sp->fill)(buf, thisrun, pa, lastx);
1462 UNCACHE_STATE(tif, sp);
1463 return ( sp->line ? 1 : -1); /* don't error on badly-terminated strips */
1465 UNCACHE_STATE(tif, sp);
1471 * Encode the requested amount of data.
1474 Fax4Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
1476 Fax3CodecState *sp = EncoderState(tif);
1479 while ((long)cc > 0) {
1480 if (!Fax3Encode2DRow(tif, bp, sp->refline, sp->b.rowpixels))
1482 _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes);
1483 bp += sp->b.rowbytes;
1484 cc -= sp->b.rowbytes;
1490 Fax4PostEncode(TIFF* tif)
1492 Fax3CodecState *sp = EncoderState(tif);
1494 /* terminate strip w/ EOFB */
1495 Fax3PutBits(tif, EOL, 12);
1496 Fax3PutBits(tif, EOL, 12);
1498 Fax3FlushBits(tif, sp);
1503 TIFFInitCCITTFax4(TIFF* tif, int scheme)
1506 if (InitCCITTFax3(tif)) { /* reuse G3 support */
1508 * Merge codec-specific tag information.
1510 if (!_TIFFMergeFieldInfo(tif, fax4FieldInfo, N(fax4FieldInfo))) {
1511 TIFFErrorExt(tif->tif_clientdata, "TIFFInitCCITTFax4",
1512 "Merging CCITT Fax 4 codec-specific tags failed");
1516 tif->tif_decoderow = Fax4Decode;
1517 tif->tif_decodestrip = Fax4Decode;
1518 tif->tif_decodetile = Fax4Decode;
1519 tif->tif_encoderow = Fax4Encode;
1520 tif->tif_encodestrip = Fax4Encode;
1521 tif->tif_encodetile = Fax4Encode;
1522 tif->tif_postencode = Fax4PostEncode;
1524 * Suppress RTC at the end of each strip.
1526 return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_NORTC);
1532 * CCITT Group 3 1-D Modified Huffman RLE Compression Support.
1533 * (Compression algorithms 2 and 32771)
1537 * Decode the requested amount of RLE-encoded data.
1540 Fax3DecodeRLE(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
1542 DECLARE_STATE(tif, sp, "Fax3DecodeRLE");
1543 int mode = sp->b.mode;
1546 CACHE_STATE(tif, sp);
1547 thisrun = sp->curruns;
1548 while ((long)occ > 0) {
1553 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail);
1554 printf("-------------------- %d\n", tif->tif_row);
1558 (*sp->fill)(buf, thisrun, pa, lastx);
1560 * Cleanup at the end of the row.
1562 if (mode & FAXMODE_BYTEALIGN) {
1563 int n = BitsAvail - (BitsAvail &~ 7);
1565 } else if (mode & FAXMODE_WORDALIGN) {
1566 int n = BitsAvail - (BitsAvail &~ 15);
1568 if (BitsAvail == 0 && !isAligned(cp, uint16))
1571 buf += sp->b.rowbytes;
1572 occ -= sp->b.rowbytes;
1575 EOFRLE: /* premature EOF */
1576 (*sp->fill)(buf, thisrun, pa, lastx);
1577 UNCACHE_STATE(tif, sp);
1580 UNCACHE_STATE(tif, sp);
1585 TIFFInitCCITTRLE(TIFF* tif, int scheme)
1588 if (InitCCITTFax3(tif)) { /* reuse G3 support */
1589 tif->tif_decoderow = Fax3DecodeRLE;
1590 tif->tif_decodestrip = Fax3DecodeRLE;
1591 tif->tif_decodetile = Fax3DecodeRLE;
1593 * Suppress RTC+EOLs when encoding and byte-align data.
1595 return TIFFSetField(tif, TIFFTAG_FAXMODE,
1596 FAXMODE_NORTC|FAXMODE_NOEOL|FAXMODE_BYTEALIGN);
1602 TIFFInitCCITTRLEW(TIFF* tif, int scheme)
1605 if (InitCCITTFax3(tif)) { /* reuse G3 support */
1606 tif->tif_decoderow = Fax3DecodeRLE;
1607 tif->tif_decodestrip = Fax3DecodeRLE;
1608 tif->tif_decodetile = Fax3DecodeRLE;
1610 * Suppress RTC+EOLs when encoding and word-align data.
1612 return TIFFSetField(tif, TIFFTAG_FAXMODE,
1613 FAXMODE_NORTC|FAXMODE_NOEOL|FAXMODE_WORDALIGN);
1617 #endif /* CCITT_SUPPORT */
1619 /* vim: set ts=8 sts=8 sw=8 noet: */