1 /* $Id: tif_fax3.c,v 1.1 2005-06-17 13:54:52 vp153 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 */
67 #define Fax3State(tif) ((Fax3BaseState*) (tif)->tif_data)
69 typedef enum { G3_1D, G3_2D } Ttag;
73 /* Decoder state info */
74 const unsigned char* bitmap; /* bit reversal table */
75 uint32 data; /* current i/o byte/word */
76 int bit; /* current i/o bit in byte */
77 int EOLcnt; /* count of EOL codes recognized */
78 TIFFFaxFillFunc fill; /* fill routine */
79 uint32* runs; /* b&w runs for current/previous row */
80 uint32* refruns; /* runs for reference line */
81 uint32* curruns; /* runs for current line */
83 /* Encoder state info */
84 Ttag tag; /* encoding state */
85 unsigned char* refline; /* reference line for 2d decoding */
86 int k; /* #rows left that can be 2d encoded */
87 int maxk; /* max #rows that can be 2d encoded */
89 #define DecoderState(tif) ((Fax3CodecState*) Fax3State(tif))
90 #define EncoderState(tif) ((Fax3CodecState*) Fax3State(tif))
92 #define is2DEncoding(sp) \
93 (sp->b.groupoptions & GROUP3OPT_2DENCODING)
94 #define isAligned(p,t) ((((unsigned long)(p)) & (sizeof (t)-1)) == 0)
97 * Group 3 and Group 4 Decoding.
101 * These macros glue the TIFF library state to
102 * the state expected by Frank's decoder.
104 #define DECLARE_STATE(tif, sp, mod) \
105 static const char module[] = mod; \
106 Fax3CodecState* sp = DecoderState(tif); \
107 int a0; /* reference element */ \
108 int lastx = sp->b.rowpixels; /* last element in row */ \
109 uint32 BitAcc; /* bit accumulator */ \
110 int BitsAvail; /* # valid bits in BitAcc */ \
111 int RunLength; /* length of current run */ \
112 unsigned char* cp; /* next byte of input data */ \
113 unsigned char* ep; /* end of input data */ \
114 uint32* pa; /* place to stuff next run */ \
115 uint32* thisrun; /* current row's run array */ \
116 int EOLcnt; /* # EOL codes recognized */ \
117 const unsigned char* bitmap = sp->bitmap; /* input data bit reverser */ \
118 const TIFFFaxTabEnt* TabEnt
119 #define DECLARE_STATE_2D(tif, sp, mod) \
120 DECLARE_STATE(tif, sp, mod); \
121 int b1; /* next change on prev line */ \
122 uint32* pb /* next run in reference line */\
124 * Load any state that may be changed during decoding.
126 #define CACHE_STATE(tif, sp) do { \
128 BitsAvail = sp->bit; \
129 EOLcnt = sp->EOLcnt; \
130 cp = (unsigned char*) tif->tif_rawcp; \
131 ep = cp + tif->tif_rawcc; \
134 * Save state possibly changed during decoding.
136 #define UNCACHE_STATE(tif, sp) do { \
137 sp->bit = BitsAvail; \
139 sp->EOLcnt = EOLcnt; \
140 tif->tif_rawcc -= (tidata_t) cp - tif->tif_rawcp; \
141 tif->tif_rawcp = (tidata_t) cp; \
145 * Setup state for decoding a strip.
148 Fax3PreDecode(TIFF* tif, tsample_t s)
150 Fax3CodecState* sp = DecoderState(tif);
154 sp->bit = 0; /* force initial read */
156 sp->EOLcnt = 0; /* force initial scan for EOL */
158 * Decoder assumes lsb-to-msb bit order. Note that we select
159 * this here rather than in Fax3SetupState so that viewers can
160 * hold the image open, fiddle with the FillOrder tag value,
161 * and then re-decode the image. Otherwise they'd need to close
162 * and open the image to get the state reset.
165 TIFFGetBitRevTable(tif->tif_dir.td_fillorder != FILLORDER_LSB2MSB);
166 if (sp->refruns) { /* init reference line to white */
167 sp->refruns[0] = (uint32) sp->b.rowpixels;
174 * Routine for handling various errors/conditions.
175 * Note how they are "glued into the decoder" by
176 * overriding the definitions used by the decoder.
180 Fax3Unexpected(const char* module, TIFF* tif, uint32 a0)
182 TIFFError(module, "%s: Bad code word at scanline %d (x %lu)",
183 tif->tif_name, tif->tif_row, (unsigned long) a0);
185 #define unexpected(table, a0) Fax3Unexpected(module, tif, a0)
188 Fax3Extension(const char* module, TIFF* tif, uint32 a0)
191 "%s: Uncompressed data (not supported) at scanline %d (x %lu)",
192 tif->tif_name, tif->tif_row, (unsigned long) a0);
194 #define extension(a0) Fax3Extension(module, tif, a0)
197 Fax3BadLength(const char* module, TIFF* tif, uint32 a0, uint32 lastx)
199 TIFFWarning(module, "%s: %s at scanline %d (got %lu, expected %lu)",
201 a0 < lastx ? "Premature EOL" : "Line length mismatch",
202 tif->tif_row, (unsigned long) a0, (unsigned long) lastx);
204 #define badlength(a0,lastx) Fax3BadLength(module, tif, a0, lastx)
207 Fax3PrematureEOF(const char* module, TIFF* tif, uint32 a0)
209 TIFFWarning(module, "%s: Premature EOF at scanline %d (x %lu)",
210 tif->tif_name, tif->tif_row, (unsigned long) a0);
212 #define prematureEOF(a0) Fax3PrematureEOF(module, tif, a0)
217 * Decode the requested amount of G3 1D-encoded data.
220 Fax3Decode1D(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
222 DECLARE_STATE(tif, sp, "Fax3Decode1D");
225 CACHE_STATE(tif, sp);
226 thisrun = sp->curruns;
227 while ((long)occ > 0) {
232 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail);
233 printf("-------------------- %d\n", tif->tif_row);
238 (*sp->fill)(buf, thisrun, pa, lastx);
239 buf += sp->b.rowbytes;
240 occ -= sp->b.rowbytes;
242 EOF1D: /* premature EOF */
244 EOF1Da: /* premature EOF */
245 (*sp->fill)(buf, thisrun, pa, lastx);
246 UNCACHE_STATE(tif, sp);
249 UNCACHE_STATE(tif, sp);
253 #define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; }
255 * Decode the requested amount of G3 2D-encoded data.
258 Fax3Decode2D(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
260 DECLARE_STATE_2D(tif, sp, "Fax3Decode2D");
261 int is1D; /* current line is 1d/2d-encoded */
264 CACHE_STATE(tif, sp);
265 while ((long)occ > 0) {
268 pa = thisrun = sp->curruns;
270 printf("\nBitAcc=%08X, BitsAvail = %d EOLcnt = %d",
271 BitAcc, BitsAvail, EOLcnt);
275 is1D = GetBits(1); /* 1D/2D-encoding tag bit */
278 printf(" %s\n-------------------- %d\n",
279 is1D ? "1D" : "2D", tif->tif_row);
288 (*sp->fill)(buf, thisrun, pa, lastx);
289 SETVAL(0); /* imaginary change for reference */
290 SWAP(uint32*, sp->curruns, sp->refruns);
291 buf += sp->b.rowbytes;
292 occ -= sp->b.rowbytes;
294 EOF2D: /* premature EOF */
296 EOF2Da: /* premature EOF */
297 (*sp->fill)(buf, thisrun, pa, lastx);
298 UNCACHE_STATE(tif, sp);
301 UNCACHE_STATE(tif, sp);
307 * The ZERO & FILL macros must handle spans < 2*sizeof(long) bytes.
308 * For machines with 64-bit longs this is <16 bytes; otherwise
309 * this is <8 bytes. We optimize the code here to reflect the
310 * machine characteristics.
313 # define FILL(n, cp) \
315 case 15:(cp)[14] = 0xff; case 14:(cp)[13] = 0xff; case 13: (cp)[12] = 0xff;\
316 case 12:(cp)[11] = 0xff; case 11:(cp)[10] = 0xff; case 10: (cp)[9] = 0xff;\
317 case 9: (cp)[8] = 0xff; case 8: (cp)[7] = 0xff; case 7: (cp)[6] = 0xff;\
318 case 6: (cp)[5] = 0xff; case 5: (cp)[4] = 0xff; case 4: (cp)[3] = 0xff;\
319 case 3: (cp)[2] = 0xff; case 2: (cp)[1] = 0xff; \
320 case 1: (cp)[0] = 0xff; (cp) += (n); case 0: ; \
322 # define ZERO(n, cp) \
324 case 15:(cp)[14] = 0; case 14:(cp)[13] = 0; case 13: (cp)[12] = 0; \
325 case 12:(cp)[11] = 0; case 11:(cp)[10] = 0; case 10: (cp)[9] = 0; \
326 case 9: (cp)[8] = 0; case 8: (cp)[7] = 0; case 7: (cp)[6] = 0; \
327 case 6: (cp)[5] = 0; case 5: (cp)[4] = 0; case 4: (cp)[3] = 0; \
328 case 3: (cp)[2] = 0; case 2: (cp)[1] = 0; \
329 case 1: (cp)[0] = 0; (cp) += (n); case 0: ; \
332 # define FILL(n, cp) \
334 case 7: (cp)[6] = 0xff; case 6: (cp)[5] = 0xff; case 5: (cp)[4] = 0xff; \
335 case 4: (cp)[3] = 0xff; case 3: (cp)[2] = 0xff; case 2: (cp)[1] = 0xff; \
336 case 1: (cp)[0] = 0xff; (cp) += (n); case 0: ; \
338 # define ZERO(n, cp) \
340 case 7: (cp)[6] = 0; case 6: (cp)[5] = 0; case 5: (cp)[4] = 0; \
341 case 4: (cp)[3] = 0; case 3: (cp)[2] = 0; case 2: (cp)[1] = 0; \
342 case 1: (cp)[0] = 0; (cp) += (n); case 0: ; \
347 * Bit-fill a row according to the white/black
348 * runs generated during G3/G4 decoding.
351 _TIFFFax3fillruns(unsigned char* buf, uint32* runs, uint32* erun, uint32 lastx)
353 static const unsigned char _fillmasks[] =
354 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
363 for (; runs < erun; runs += 2) {
365 if (x+run > lastx || run > lastx )
366 run = runs[0] = (uint32) (lastx - x);
371 if (bx) { /* align to byte boundary */
372 *cp++ &= 0xff << (8-bx);
375 if( (n = run >> 3) != 0 ) { /* multiple bytes to fill */
376 if ((n/sizeof (long)) > 1) {
378 * Align to longword boundary and fill.
380 for (; n && !isAligned(cp, long); n--)
383 nw = (int32)(n / sizeof (long));
384 n -= nw * sizeof (long);
388 cp = (unsigned char*) lp;
394 cp[0] &= 0xff >> run;
396 cp[0] &= ~(_fillmasks[run]>>bx);
400 if (x+run > lastx || run > lastx )
401 run = runs[1] = lastx - x;
406 if (bx) { /* align to byte boundary */
410 if( (n = run>>3) != 0 ) { /* multiple bytes to fill */
411 if ((n/sizeof (long)) > 1) {
413 * Align to longword boundary and fill.
415 for (; n && !isAligned(cp, long); n--)
418 nw = (int32)(n / sizeof (long));
419 n -= nw * sizeof (long);
423 cp = (unsigned char*) lp;
429 cp[0] |= 0xff00 >> run;
431 cp[0] |= _fillmasks[run]>>bx;
441 CheckMalloc(TIFF* tif, size_t nmemb, size_t elem_size, const char* what)
444 tsize_t bytes = nmemb * elem_size;
446 if (nmemb && elem_size && bytes / elem_size == nmemb)
447 cp = (char*) _TIFFmalloc(bytes);
450 TIFFError(tif->tif_name, "No space %s", what);
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);
467 long rowbytes, rowpixels;
469 Fax3CodecState* dsp = (Fax3CodecState*) Fax3State(tif);
472 if (td->td_bitspersample != 1) {
473 TIFFError(tif->tif_name,
474 "Bits/sample must be 1 for Group 3/4 encoding/decoding");
478 * Calculate the scanline/tile widths.
481 rowbytes = TIFFTileRowSize(tif);
482 rowpixels = td->td_tilewidth;
484 rowbytes = TIFFScanlineSize(tif);
485 rowpixels = td->td_imagewidth;
487 sp->rowbytes = (uint32) rowbytes;
488 sp->rowpixels = (uint32) rowpixels;
490 * Allocate any additional space required for decoding/encoding.
493 (sp->groupoptions & GROUP3OPT_2DENCODING) ||
494 td->td_compression == COMPRESSION_CCITTFAX4
497 nruns = needsRefLine ? 2*TIFFroundup(rowpixels,32) : rowpixels;
499 dsp->runs = (uint32*) CheckMalloc(tif, 2*nruns+3, sizeof (uint32),
500 "for Group 3/4 run arrays");
501 if (dsp->runs == NULL)
503 dsp->curruns = dsp->runs;
505 dsp->refruns = dsp->runs + (nruns>>1);
508 if (td->td_compression == COMPRESSION_CCITTFAX3
509 && is2DEncoding(dsp)) { /* NB: default is 1D routine */
510 tif->tif_decoderow = Fax3Decode2D;
511 tif->tif_decodestrip = Fax3Decode2D;
512 tif->tif_decodetile = Fax3Decode2D;
515 if (needsRefLine) { /* 2d encoding */
516 Fax3CodecState* esp = EncoderState(tif);
518 * 2d encoding requires a scanline
519 * buffer for the ``reference line''; the
520 * scanline against which delta encoding
521 * is referenced. The reference line must
522 * be initialized to be ``white'' (done elsewhere).
524 esp->refline = (unsigned char*) _TIFFmalloc(rowbytes);
525 if (esp->refline == NULL) {
526 TIFFError("Fax3SetupState",
527 "%s: No space for Group 3/4 reference line",
531 } else /* 1d encoding */
532 EncoderState(tif)->refline = NULL;
538 * CCITT Group 3 FAX Encoding.
541 #define Fax3FlushBits(tif, sp) { \
542 if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
543 (void) TIFFFlushData1(tif); \
544 *(tif)->tif_rawcp++ = (tidataval_t) (sp)->data; \
545 (tif)->tif_rawcc++; \
546 (sp)->data = 0, (sp)->bit = 8; \
548 #define _FlushBits(tif) { \
549 if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
550 (void) TIFFFlushData1(tif); \
551 *(tif)->tif_rawcp++ = (tidataval_t) data; \
552 (tif)->tif_rawcc++; \
555 static const int _msbmask[9] =
556 { 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff };
557 #define _PutBits(tif, bits, length) { \
558 while (length > bit) { \
559 data |= bits >> (length - bit); \
563 data |= (bits & _msbmask[length]) << (bit - length); \
570 * Write a variable-length bit-value to
571 * the output stream. Values are
572 * assumed to be at most 16 bits.
575 Fax3PutBits(TIFF* tif, unsigned int bits, unsigned int length)
577 Fax3CodecState* sp = EncoderState(tif);
578 unsigned int bit = sp->bit;
581 _PutBits(tif, bits, length);
588 * Write a code to the output stream.
590 #define putcode(tif, te) Fax3PutBits(tif, (te)->code, (te)->length)
593 #define DEBUG_COLOR(w) (tab == TIFFFaxWhiteCodes ? w "W" : w "B")
594 #define DEBUG_PRINT(what,len) { \
596 printf("%08X/%-2d: %s%5d\t", data, bit, DEBUG_COLOR(what), len); \
597 for (t = length-1; t >= 0; t--) \
598 putchar(code & (1<<t) ? '1' : '0'); \
604 * Write the sequence of codes that describes
605 * the specified span of zero's or one's. The
606 * appropriate table that holds the make-up and
607 * terminating codes is supplied.
610 putspan(TIFF* tif, int32 span, const tableentry* tab)
612 Fax3CodecState* sp = EncoderState(tif);
613 unsigned int bit = sp->bit;
615 unsigned int code, length;
617 while (span >= 2624) {
618 const tableentry* te = &tab[63 + (2560>>6)];
619 code = te->code, length = te->length;
621 DEBUG_PRINT("MakeUp", te->runlen);
623 _PutBits(tif, code, length);
627 const tableentry* te = &tab[63 + (span>>6)];
628 assert(te->runlen == 64*(span>>6));
629 code = te->code, length = te->length;
631 DEBUG_PRINT("MakeUp", te->runlen);
633 _PutBits(tif, code, length);
636 code = tab[span].code, length = tab[span].length;
638 DEBUG_PRINT(" Term", tab[span].runlen);
640 _PutBits(tif, code, length);
647 * Write an EOL code to the output stream. The zero-fill
648 * logic for byte-aligning encoded scanlines is handled
649 * here. We also handle writing the tag bit for the next
650 * scanline when doing 2d encoding.
653 Fax3PutEOL(TIFF* tif)
655 Fax3CodecState* sp = EncoderState(tif);
656 unsigned int bit = sp->bit;
658 unsigned int code, length, tparm;
660 if (sp->b.groupoptions & GROUP3OPT_FILLBITS) {
662 * Force bit alignment so EOL will terminate on
663 * a byte boundary. That is, force the bit alignment
664 * to 16-12 = 4 before putting out the EOL code.
667 if (align != sp->bit) {
669 align = sp->bit + (8 - align);
671 align = sp->bit - align;
674 _PutBits(tif, 0, tparm);
677 code = EOL, length = 12;
678 if (is2DEncoding(sp))
679 code = (code<<1) | (sp->tag == G3_1D), length++;
680 _PutBits(tif, code, length);
687 * Reset encoding state at the start of a strip.
690 Fax3PreEncode(TIFF* tif, tsample_t s)
692 Fax3CodecState* sp = EncoderState(tif);
700 * This is necessary for Group 4; otherwise it isn't
701 * needed because the first scanline of each strip ends
702 * up being copied into the refline.
705 _TIFFmemset(sp->refline, 0x00, sp->b.rowbytes);
706 if (is2DEncoding(sp)) {
707 float res = tif->tif_dir.td_yresolution;
709 * The CCITT spec says that when doing 2d encoding, you
710 * should only do it on K consecutive scanlines, where K
711 * depends on the resolution of the image being encoded
712 * (2 for <= 200 lpi, 4 for > 200 lpi). Since the directory
713 * code initializes td_yresolution to 0, this code will
714 * select a K of 2 unless the YResolution tag is set
715 * appropriately. (Note also that we fudge a little here
716 * and use 150 lpi to avoid problems with units conversion.)
718 if (tif->tif_dir.td_resolutionunit == RESUNIT_CENTIMETER)
719 res *= 2.54f; /* convert to inches */
720 sp->maxk = (res > 150 ? 4 : 2);
723 sp->k = sp->maxk = 0;
727 static const unsigned char zeroruns[256] = {
728 8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, /* 0x00 - 0x0f */
729 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0x10 - 0x1f */
730 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x20 - 0x2f */
731 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x30 - 0x3f */
732 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x40 - 0x4f */
733 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x50 - 0x5f */
734 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x60 - 0x6f */
735 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x70 - 0x7f */
736 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x80 - 0x8f */
737 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x90 - 0x9f */
738 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xa0 - 0xaf */
739 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xb0 - 0xbf */
740 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xc0 - 0xcf */
741 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xd0 - 0xdf */
742 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xe0 - 0xef */
743 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xf0 - 0xff */
745 static const unsigned char oneruns[256] = {
746 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x00 - 0x0f */
747 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x10 - 0x1f */
748 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x20 - 0x2f */
749 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x30 - 0x3f */
750 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x40 - 0x4f */
751 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x50 - 0x5f */
752 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x60 - 0x6f */
753 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x70 - 0x7f */
754 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x80 - 0x8f */
755 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x90 - 0x9f */
756 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xa0 - 0xaf */
757 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xb0 - 0xbf */
758 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xc0 - 0xcf */
759 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xd0 - 0xdf */
760 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0xe0 - 0xef */
761 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 8, /* 0xf0 - 0xff */
765 * On certain systems it pays to inline
766 * the routines that find pixel spans.
769 static int32 find0span(unsigned char*, int32, int32);
770 static int32 find1span(unsigned char*, int32, int32);
771 #pragma inline(find0span,find1span)
775 * Find a span of ones or zeros using the supplied
776 * table. The ``base'' of the bit string is supplied
777 * along with the start+end bit indices.
780 find0span(unsigned char* bp, int32 bs, int32 be)
782 int32 bits = be - bs;
787 * Check partial byte on lhs.
789 if (bits > 0 && (n = (bs & 7))) {
790 span = zeroruns[(*bp << n) & 0xff];
791 if (span > 8-n) /* table value too generous */
793 if (span > bits) /* constrain span to bit range */
795 if (n+span < 8) /* doesn't extend to edge of byte */
801 if (bits >= 2*8*sizeof (long)) {
804 * Align to longword boundary and check longwords.
806 while (!isAligned(bp, long)) {
808 return (span + zeroruns[*bp]);
809 span += 8, bits -= 8;
813 while (bits >= 8*sizeof (long) && *lp == 0) {
814 span += 8*sizeof (long), bits -= 8*sizeof (long);
817 bp = (unsigned char*) lp;
820 * Scan full bytes for all 0's.
823 if (*bp != 0x00) /* end of run */
824 return (span + zeroruns[*bp]);
825 span += 8, bits -= 8;
829 * Check partial byte on rhs.
833 span += (n > bits ? bits : n);
839 find1span(unsigned char* bp, int32 bs, int32 be)
841 int32 bits = be - bs;
846 * Check partial byte on lhs.
848 if (bits > 0 && (n = (bs & 7))) {
849 span = oneruns[(*bp << n) & 0xff];
850 if (span > 8-n) /* table value too generous */
852 if (span > bits) /* constrain span to bit range */
854 if (n+span < 8) /* doesn't extend to edge of byte */
860 if (bits >= 2*8*sizeof (long)) {
863 * Align to longword boundary and check longwords.
865 while (!isAligned(bp, long)) {
867 return (span + oneruns[*bp]);
868 span += 8, bits -= 8;
872 while (bits >= 8*sizeof (long) && *lp == ~0) {
873 span += 8*sizeof (long), bits -= 8*sizeof (long);
876 bp = (unsigned char*) lp;
879 * Scan full bytes for all 1's.
882 if (*bp != 0xff) /* end of run */
883 return (span + oneruns[*bp]);
884 span += 8, bits -= 8;
888 * Check partial byte on rhs.
892 span += (n > bits ? bits : n);
898 * Return the offset of the next bit in the range
899 * [bs..be] that is different from the specified
900 * color. The end, be, is returned if no such bit
903 #define finddiff(_cp, _bs, _be, _color) \
904 (_bs + (_color ? find1span(_cp,_bs,_be) : find0span(_cp,_bs,_be)))
906 * Like finddiff, but also check the starting bit
907 * against the end in case start > end.
909 #define finddiff2(_cp, _bs, _be, _color) \
910 (_bs < _be ? finddiff(_cp,_bs,_be,_color) : _be)
913 * 1d-encode a row of pixels. The encoding is
914 * a sequence of all-white or all-black spans
915 * of pixels encoded with Huffman codes.
918 Fax3Encode1DRow(TIFF* tif, unsigned char* bp, uint32 bits)
920 Fax3CodecState* sp = EncoderState(tif);
925 span = find0span(bp, bs, bits); /* white span */
926 putspan(tif, span, TIFFFaxWhiteCodes);
930 span = find1span(bp, bs, bits); /* black span */
931 putspan(tif, span, TIFFFaxBlackCodes);
936 if (sp->b.mode & (FAXMODE_BYTEALIGN|FAXMODE_WORDALIGN)) {
937 if (sp->bit != 8) /* byte-align */
938 Fax3FlushBits(tif, sp);
939 if ((sp->b.mode&FAXMODE_WORDALIGN) &&
940 !isAligned(tif->tif_rawcp, uint16))
941 Fax3FlushBits(tif, sp);
946 static const tableentry horizcode =
947 { 3, 0x1 }; /* 001 */
948 static const tableentry passcode =
949 { 4, 0x1 }; /* 0001 */
950 static const tableentry vcodes[7] = {
951 { 7, 0x03 }, /* 0000 011 */
952 { 6, 0x03 }, /* 0000 11 */
953 { 3, 0x03 }, /* 011 */
955 { 3, 0x2 }, /* 010 */
956 { 6, 0x02 }, /* 0000 10 */
957 { 7, 0x02 } /* 0000 010 */
961 * 2d-encode a row of pixels. Consult the CCITT
962 * documentation for the algorithm.
965 Fax3Encode2DRow(TIFF* tif, unsigned char* bp, unsigned char* rp, uint32 bits)
967 #define PIXEL(buf,ix) ((((buf)[(ix)>>3]) >> (7-((ix)&7))) & 1)
969 uint32 a1 = (PIXEL(bp, 0) != 0 ? 0 : finddiff(bp, 0, bits, 0));
970 uint32 b1 = (PIXEL(rp, 0) != 0 ? 0 : finddiff(rp, 0, bits, 0));
974 b2 = finddiff2(rp, b1, bits, PIXEL(rp,b1));
977 if (!(-3 <= d && d <= 3)) { /* horizontal mode */
978 a2 = finddiff2(bp, a1, bits, PIXEL(bp,a1));
979 putcode(tif, &horizcode);
980 if (a0+a1 == 0 || PIXEL(bp, a0) == 0) {
981 putspan(tif, a1-a0, TIFFFaxWhiteCodes);
982 putspan(tif, a2-a1, TIFFFaxBlackCodes);
984 putspan(tif, a1-a0, TIFFFaxBlackCodes);
985 putspan(tif, a2-a1, TIFFFaxWhiteCodes);
988 } else { /* vertical mode */
989 putcode(tif, &vcodes[d+3]);
992 } else { /* pass mode */
993 putcode(tif, &passcode);
998 a1 = finddiff(bp, a0, bits, PIXEL(bp,a0));
999 b1 = finddiff(rp, a0, bits, !PIXEL(bp,a0));
1000 b1 = finddiff(rp, b1, bits, PIXEL(bp,a0));
1007 * Encode a buffer of pixels.
1010 Fax3Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
1012 Fax3CodecState* sp = EncoderState(tif);
1015 while ((long)cc > 0) {
1016 if ((sp->b.mode & FAXMODE_NOEOL) == 0)
1018 if (is2DEncoding(sp)) {
1019 if (sp->tag == G3_1D) {
1020 if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels))
1024 if (!Fax3Encode2DRow(tif, bp, sp->refline,
1033 _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes);
1035 if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels))
1038 bp += sp->b.rowbytes;
1039 cc -= sp->b.rowbytes;
1045 Fax3PostEncode(TIFF* tif)
1047 Fax3CodecState* sp = EncoderState(tif);
1050 Fax3FlushBits(tif, sp);
1055 Fax3Close(TIFF* tif)
1057 if ((Fax3State(tif)->mode & FAXMODE_NORTC) == 0) {
1058 Fax3CodecState* sp = EncoderState(tif);
1059 unsigned int code = EOL;
1060 unsigned int length = 12;
1063 if (is2DEncoding(sp))
1064 code = (code<<1) | (sp->tag == G3_1D), length++;
1065 for (i = 0; i < 6; i++)
1066 Fax3PutBits(tif, code, length);
1067 Fax3FlushBits(tif, sp);
1072 Fax3Cleanup(TIFF* tif)
1074 if (tif->tif_data) {
1075 Fax3CodecState* sp = DecoderState(tif);
1078 _TIFFfree(sp->runs);
1080 _TIFFfree(sp->refline);
1082 if (Fax3State(tif)->subaddress)
1083 _TIFFfree(Fax3State(tif)->subaddress);
1084 _TIFFfree(tif->tif_data);
1085 tif->tif_data = NULL;
1089 #define FIELD_BADFAXLINES (FIELD_CODEC+0)
1090 #define FIELD_CLEANFAXDATA (FIELD_CODEC+1)
1091 #define FIELD_BADFAXRUN (FIELD_CODEC+2)
1092 #define FIELD_RECVPARAMS (FIELD_CODEC+3)
1093 #define FIELD_SUBADDRESS (FIELD_CODEC+4)
1094 #define FIELD_RECVTIME (FIELD_CODEC+5)
1095 #define FIELD_FAXDCS (FIELD_CODEC+6)
1097 #define FIELD_OPTIONS (FIELD_CODEC+7)
1099 static const TIFFFieldInfo faxFieldInfo[] = {
1100 { TIFFTAG_FAXMODE, 0, 0, TIFF_ANY, FIELD_PSEUDO,
1101 FALSE, FALSE, "FaxMode" },
1102 { TIFFTAG_FAXFILLFUNC, 0, 0, TIFF_ANY, FIELD_PSEUDO,
1103 FALSE, FALSE, "FaxFillFunc" },
1104 { TIFFTAG_BADFAXLINES, 1, 1, TIFF_LONG, FIELD_BADFAXLINES,
1105 TRUE, FALSE, "BadFaxLines" },
1106 { TIFFTAG_BADFAXLINES, 1, 1, TIFF_SHORT, FIELD_BADFAXLINES,
1107 TRUE, FALSE, "BadFaxLines" },
1108 { TIFFTAG_CLEANFAXDATA, 1, 1, TIFF_SHORT, FIELD_CLEANFAXDATA,
1109 TRUE, FALSE, "CleanFaxData" },
1110 { TIFFTAG_CONSECUTIVEBADFAXLINES,1,1, TIFF_LONG, FIELD_BADFAXRUN,
1111 TRUE, FALSE, "ConsecutiveBadFaxLines" },
1112 { TIFFTAG_CONSECUTIVEBADFAXLINES,1,1, TIFF_SHORT, FIELD_BADFAXRUN,
1113 TRUE, FALSE, "ConsecutiveBadFaxLines" },
1114 { TIFFTAG_FAXRECVPARAMS, 1, 1, TIFF_LONG, FIELD_RECVPARAMS,
1115 TRUE, FALSE, "FaxRecvParams" },
1116 { TIFFTAG_FAXSUBADDRESS, -1,-1, TIFF_ASCII, FIELD_SUBADDRESS,
1117 TRUE, FALSE, "FaxSubAddress" },
1118 { TIFFTAG_FAXRECVTIME, 1, 1, TIFF_LONG, FIELD_RECVTIME,
1119 TRUE, FALSE, "FaxRecvTime" },
1120 { TIFFTAG_FAXDCS, -1,-1, TIFF_ASCII, FIELD_FAXDCS,
1121 TRUE, FALSE, "FaxDcs" },
1123 static const TIFFFieldInfo fax3FieldInfo[] = {
1124 { TIFFTAG_GROUP3OPTIONS, 1, 1, TIFF_LONG, FIELD_OPTIONS,
1125 FALSE, FALSE, "Group3Options" },
1127 static const TIFFFieldInfo fax4FieldInfo[] = {
1128 { TIFFTAG_GROUP4OPTIONS, 1, 1, TIFF_LONG, FIELD_OPTIONS,
1129 FALSE, FALSE, "Group4Options" },
1131 #define N(a) (sizeof (a) / sizeof (a[0]))
1134 Fax3VSetField(TIFF* tif, ttag_t tag, va_list ap)
1136 Fax3BaseState* sp = Fax3State(tif);
1139 case TIFFTAG_FAXMODE:
1140 sp->mode = va_arg(ap, int);
1141 return (1); /* NB: pseudo tag */
1142 case TIFFTAG_FAXFILLFUNC:
1143 DecoderState(tif)->fill = va_arg(ap, TIFFFaxFillFunc);
1144 return (1); /* NB: pseudo tag */
1145 case TIFFTAG_GROUP3OPTIONS:
1146 /* XXX: avoid reading options if compression mismatches. */
1147 if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX3)
1148 sp->groupoptions = va_arg(ap, uint32);
1150 case TIFFTAG_GROUP4OPTIONS:
1151 /* XXX: avoid reading options if compression mismatches. */
1152 if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4)
1153 sp->groupoptions = va_arg(ap, uint32);
1155 case TIFFTAG_BADFAXLINES:
1156 sp->badfaxlines = va_arg(ap, uint32);
1158 case TIFFTAG_CLEANFAXDATA:
1159 sp->cleanfaxdata = (uint16) va_arg(ap, int);
1161 case TIFFTAG_CONSECUTIVEBADFAXLINES:
1162 sp->badfaxrun = va_arg(ap, uint32);
1164 case TIFFTAG_FAXRECVPARAMS:
1165 sp->recvparams = va_arg(ap, uint32);
1167 case TIFFTAG_FAXSUBADDRESS:
1168 _TIFFsetString(&sp->subaddress, va_arg(ap, char*));
1170 case TIFFTAG_FAXRECVTIME:
1171 sp->recvtime = va_arg(ap, uint32);
1173 case TIFFTAG_FAXDCS:
1174 _TIFFsetString(&sp->faxdcs, va_arg(ap, char*));
1177 return (*sp->vsetparent)(tif, tag, ap);
1179 TIFFSetFieldBit(tif, _TIFFFieldWithTag(tif, tag)->field_bit);
1180 tif->tif_flags |= TIFF_DIRTYDIRECT;
1185 Fax3VGetField(TIFF* tif, ttag_t tag, va_list ap)
1187 Fax3BaseState* sp = Fax3State(tif);
1190 case TIFFTAG_FAXMODE:
1191 *va_arg(ap, int*) = sp->mode;
1193 case TIFFTAG_FAXFILLFUNC:
1194 *va_arg(ap, TIFFFaxFillFunc*) = DecoderState(tif)->fill;
1196 case TIFFTAG_GROUP3OPTIONS:
1197 case TIFFTAG_GROUP4OPTIONS:
1198 *va_arg(ap, uint32*) = sp->groupoptions;
1200 case TIFFTAG_BADFAXLINES:
1201 *va_arg(ap, uint32*) = sp->badfaxlines;
1203 case TIFFTAG_CLEANFAXDATA:
1204 *va_arg(ap, uint16*) = sp->cleanfaxdata;
1206 case TIFFTAG_CONSECUTIVEBADFAXLINES:
1207 *va_arg(ap, uint32*) = sp->badfaxrun;
1209 case TIFFTAG_FAXRECVPARAMS:
1210 *va_arg(ap, uint32*) = sp->recvparams;
1212 case TIFFTAG_FAXSUBADDRESS:
1213 *va_arg(ap, char**) = sp->subaddress;
1215 case TIFFTAG_FAXRECVTIME:
1216 *va_arg(ap, uint32*) = sp->recvtime;
1218 case TIFFTAG_FAXDCS:
1219 *va_arg(ap, char**) = sp->faxdcs;
1222 return (*sp->vgetparent)(tif, tag, ap);
1228 Fax3PrintDir(TIFF* tif, FILE* fd, long flags)
1230 Fax3BaseState* sp = Fax3State(tif);
1233 if (TIFFFieldSet(tif,FIELD_OPTIONS)) {
1234 const char* sep = " ";
1235 if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4) {
1236 fprintf(fd, " Group 4 Options:");
1237 if (sp->groupoptions & GROUP4OPT_UNCOMPRESSED)
1238 fprintf(fd, "%suncompressed data", sep);
1241 fprintf(fd, " Group 3 Options:");
1242 if (sp->groupoptions & GROUP3OPT_2DENCODING)
1243 fprintf(fd, "%s2-d encoding", sep), sep = "+";
1244 if (sp->groupoptions & GROUP3OPT_FILLBITS)
1245 fprintf(fd, "%sEOL padding", sep), sep = "+";
1246 if (sp->groupoptions & GROUP3OPT_UNCOMPRESSED)
1247 fprintf(fd, "%suncompressed data", sep);
1249 fprintf(fd, " (%lu = 0x%lx)\n",
1250 (unsigned long) sp->groupoptions,
1251 (unsigned long) sp->groupoptions);
1253 if (TIFFFieldSet(tif,FIELD_CLEANFAXDATA)) {
1254 fprintf(fd, " Fax Data:");
1255 switch (sp->cleanfaxdata) {
1256 case CLEANFAXDATA_CLEAN:
1257 fprintf(fd, " clean");
1259 case CLEANFAXDATA_REGENERATED:
1260 fprintf(fd, " receiver regenerated");
1262 case CLEANFAXDATA_UNCLEAN:
1263 fprintf(fd, " uncorrected errors");
1266 fprintf(fd, " (%u = 0x%x)\n",
1267 sp->cleanfaxdata, sp->cleanfaxdata);
1269 if (TIFFFieldSet(tif,FIELD_BADFAXLINES))
1270 fprintf(fd, " Bad Fax Lines: %lu\n",
1271 (unsigned long) sp->badfaxlines);
1272 if (TIFFFieldSet(tif,FIELD_BADFAXRUN))
1273 fprintf(fd, " Consecutive Bad Fax Lines: %lu\n",
1274 (unsigned long) sp->badfaxrun);
1275 if (TIFFFieldSet(tif,FIELD_RECVPARAMS))
1276 fprintf(fd, " Fax Receive Parameters: %08lx\n",
1277 (unsigned long) sp->recvparams);
1278 if (TIFFFieldSet(tif,FIELD_SUBADDRESS))
1279 fprintf(fd, " Fax SubAddress: %s\n", sp->subaddress);
1280 if (TIFFFieldSet(tif,FIELD_RECVTIME))
1281 fprintf(fd, " Fax Receive Time: %lu secs\n",
1282 (unsigned long) sp->recvtime);
1283 if (TIFFFieldSet(tif,FIELD_FAXDCS))
1284 fprintf(fd, " Fax DCS: %s\n", sp->faxdcs);
1288 InitCCITTFax3(TIFF* tif)
1293 * Allocate state block so tag methods have storage to record values.
1295 tif->tif_data = (tidata_t)
1296 _TIFFmalloc(sizeof (Fax3CodecState));
1298 if (tif->tif_data == NULL) {
1299 TIFFError("TIFFInitCCITTFax3",
1300 "%s: No space for state block", tif->tif_name);
1304 sp = Fax3State(tif);
1305 sp->rw_mode = tif->tif_mode;
1308 * Merge codec-specific tag information and
1309 * override parent get/set field methods.
1311 _TIFFMergeFieldInfo(tif, faxFieldInfo, N(faxFieldInfo));
1312 sp->vgetparent = tif->tif_tagmethods.vgetfield;
1313 tif->tif_tagmethods.vgetfield = Fax3VGetField; /* hook for codec tags */
1314 sp->vsetparent = tif->tif_tagmethods.vsetfield;
1315 tif->tif_tagmethods.vsetfield = Fax3VSetField; /* hook for codec tags */
1316 tif->tif_tagmethods.printdir = Fax3PrintDir; /* hook for codec tags */
1317 sp->groupoptions = 0;
1319 sp->subaddress = NULL;
1322 if (sp->rw_mode == O_RDONLY) /* FIXME: improve for in place update */
1323 tif->tif_flags |= TIFF_NOBITREV; /* decoder does bit reversal */
1324 DecoderState(tif)->runs = NULL;
1325 TIFFSetField(tif, TIFFTAG_FAXFILLFUNC, _TIFFFax3fillruns);
1326 EncoderState(tif)->refline = NULL;
1329 * Install codec methods.
1331 tif->tif_setupdecode = Fax3SetupState;
1332 tif->tif_predecode = Fax3PreDecode;
1333 tif->tif_decoderow = Fax3Decode1D;
1334 tif->tif_decodestrip = Fax3Decode1D;
1335 tif->tif_decodetile = Fax3Decode1D;
1336 tif->tif_setupencode = Fax3SetupState;
1337 tif->tif_preencode = Fax3PreEncode;
1338 tif->tif_postencode = Fax3PostEncode;
1339 tif->tif_encoderow = Fax3Encode;
1340 tif->tif_encodestrip = Fax3Encode;
1341 tif->tif_encodetile = Fax3Encode;
1342 tif->tif_close = Fax3Close;
1343 tif->tif_cleanup = Fax3Cleanup;
1349 TIFFInitCCITTFax3(TIFF* tif, int scheme)
1351 if (InitCCITTFax3(tif)) {
1352 _TIFFMergeFieldInfo(tif, fax3FieldInfo, N(fax3FieldInfo));
1355 * The default format is Class/F-style w/o RTC.
1357 return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_CLASSF);
1363 * CCITT Group 4 (T.6) Facsimile-compatible
1364 * Compression Scheme Support.
1367 #define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; }
1369 * Decode the requested amount of G4-encoded data.
1372 Fax4Decode(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
1374 DECLARE_STATE_2D(tif, sp, "Fax4Decode");
1377 CACHE_STATE(tif, sp);
1378 while ((long)occ > 0) {
1381 pa = thisrun = sp->curruns;
1385 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail);
1386 printf("-------------------- %d\n", tif->tif_row);
1392 (*sp->fill)(buf, thisrun, pa, lastx);
1393 SETVAL(0); /* imaginary change for reference */
1394 SWAP(uint32*, sp->curruns, sp->refruns);
1395 buf += sp->b.rowbytes;
1396 occ -= sp->b.rowbytes;
1399 NeedBits16( 13, BADG4 );
1402 if( GetBits(13) != 0x1001 )
1403 fputs( "Bad RTC\n", stderr );
1406 (*sp->fill)(buf, thisrun, pa, lastx);
1407 UNCACHE_STATE(tif, sp);
1410 UNCACHE_STATE(tif, sp);
1416 * Encode the requested amount of data.
1419 Fax4Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
1421 Fax3CodecState *sp = EncoderState(tif);
1424 while ((long)cc > 0) {
1425 if (!Fax3Encode2DRow(tif, bp, sp->refline, sp->b.rowpixels))
1427 _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes);
1428 bp += sp->b.rowbytes;
1429 cc -= sp->b.rowbytes;
1435 Fax4PostEncode(TIFF* tif)
1437 Fax3CodecState *sp = EncoderState(tif);
1439 /* terminate strip w/ EOFB */
1440 Fax3PutBits(tif, EOL, 12);
1441 Fax3PutBits(tif, EOL, 12);
1443 Fax3FlushBits(tif, sp);
1448 TIFFInitCCITTFax4(TIFF* tif, int scheme)
1450 if (InitCCITTFax3(tif)) { /* reuse G3 support */
1451 _TIFFMergeFieldInfo(tif, fax4FieldInfo, N(fax4FieldInfo));
1453 tif->tif_decoderow = Fax4Decode;
1454 tif->tif_decodestrip = Fax4Decode;
1455 tif->tif_decodetile = Fax4Decode;
1456 tif->tif_encoderow = Fax4Encode;
1457 tif->tif_encodestrip = Fax4Encode;
1458 tif->tif_encodetile = Fax4Encode;
1459 tif->tif_postencode = Fax4PostEncode;
1461 * Suppress RTC at the end of each strip.
1463 return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_NORTC);
1469 * CCITT Group 3 1-D Modified Huffman RLE Compression Support.
1470 * (Compression algorithms 2 and 32771)
1474 * Decode the requested amount of RLE-encoded data.
1477 Fax3DecodeRLE(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
1479 DECLARE_STATE(tif, sp, "Fax3DecodeRLE");
1480 int mode = sp->b.mode;
1483 CACHE_STATE(tif, sp);
1484 thisrun = sp->curruns;
1485 while ((long)occ > 0) {
1490 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail);
1491 printf("-------------------- %d\n", tif->tif_row);
1495 (*sp->fill)(buf, thisrun, pa, lastx);
1497 * Cleanup at the end of the row.
1499 if (mode & FAXMODE_BYTEALIGN) {
1500 int n = BitsAvail - (BitsAvail &~ 7);
1502 } else if (mode & FAXMODE_WORDALIGN) {
1503 int n = BitsAvail - (BitsAvail &~ 15);
1505 if (BitsAvail == 0 && !isAligned(cp, uint16))
1508 buf += sp->b.rowbytes;
1509 occ -= sp->b.rowbytes;
1511 EOFRLE: /* premature EOF */
1512 (*sp->fill)(buf, thisrun, pa, lastx);
1513 UNCACHE_STATE(tif, sp);
1516 UNCACHE_STATE(tif, sp);
1521 TIFFInitCCITTRLE(TIFF* tif, int scheme)
1523 if (InitCCITTFax3(tif)) { /* reuse G3 support */
1524 tif->tif_decoderow = Fax3DecodeRLE;
1525 tif->tif_decodestrip = Fax3DecodeRLE;
1526 tif->tif_decodetile = Fax3DecodeRLE;
1528 * Suppress RTC+EOLs when encoding and byte-align data.
1530 return TIFFSetField(tif, TIFFTAG_FAXMODE,
1531 FAXMODE_NORTC|FAXMODE_NOEOL|FAXMODE_BYTEALIGN);
1537 TIFFInitCCITTRLEW(TIFF* tif, int scheme)
1539 if (InitCCITTFax3(tif)) { /* reuse G3 support */
1540 tif->tif_decoderow = Fax3DecodeRLE;
1541 tif->tif_decodestrip = Fax3DecodeRLE;
1542 tif->tif_decodetile = Fax3DecodeRLE;
1544 * Suppress RTC+EOLs when encoding and word-align data.
1546 return TIFFSetField(tif, TIFFTAG_FAXMODE,
1547 FAXMODE_NORTC|FAXMODE_NOEOL|FAXMODE_WORDALIGN);
1551 #endif /* CCITT_SUPPORT */
1553 /* vim: set ts=8 sts=8 sw=8 noet: */