1 /* $Id: tif_fax3.c,v 1.81 2017-06-18 10:31:50 erouault 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 tmsize_t 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 */
61 TIFFVGetMethod vgetparent
; /* super-class method */
62 TIFFVSetMethod vsetparent
; /* super-class method */
63 TIFFPrintMethod printdir
; /* super-class method */
65 #define Fax3State(tif) ((Fax3BaseState*) (tif)->tif_data)
67 typedef enum { G3_1D
, G3_2D
} Ttag
;
71 /* Decoder state info */
72 const unsigned char* bitmap
; /* bit reversal table */
73 uint32 data
; /* current i/o byte/word */
74 int bit
; /* current i/o bit in byte */
75 int EOLcnt
; /* count of EOL codes recognized */
76 TIFFFaxFillFunc fill
; /* fill routine */
77 uint32
* runs
; /* b&w runs for current/previous row */
78 uint32
* refruns
; /* runs for reference line */
79 uint32
* curruns
; /* runs for current line */
81 /* Encoder state info */
82 Ttag tag
; /* encoding state */
83 unsigned char* refline
; /* reference line for 2d decoding */
84 int k
; /* #rows left that can be 2d encoded */
85 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) (sp->b.groupoptions & GROUP3OPT_2DENCODING)
93 #define isAligned(p,t) ((((size_t)(p)) & (sizeof (t)-1)) == 0)
96 * Group 3 and Group 4 Decoding.
100 * These macros glue the TIFF library state to
101 * the state expected by Frank's decoder.
103 #define DECLARE_STATE(tif, sp, mod) \
104 static const char module[] = mod; \
105 Fax3CodecState* sp = DecoderState(tif); \
106 int a0; /* reference element */ \
107 int lastx = sp->b.rowpixels; /* last element in row */ \
108 uint32 BitAcc; /* bit accumulator */ \
109 int BitsAvail; /* # valid bits in BitAcc */ \
110 int RunLength; /* length of current run */ \
111 unsigned char* cp; /* next byte of input data */ \
112 unsigned char* ep; /* end of input data */ \
113 uint32* pa; /* place to stuff next run */ \
114 uint32* thisrun; /* current row's run array */ \
115 int EOLcnt; /* # EOL codes recognized */ \
116 const unsigned char* bitmap = sp->bitmap; /* input data bit reverser */ \
117 const TIFFFaxTabEnt* TabEnt
118 #define DECLARE_STATE_2D(tif, sp, mod) \
119 DECLARE_STATE(tif, sp, mod); \
120 int b1; /* next change on prev line */ \
121 uint32* pb /* next run in reference line */\
123 * Load any state that may be changed during decoding.
125 #define CACHE_STATE(tif, sp) do { \
127 BitsAvail = sp->bit; \
128 EOLcnt = sp->EOLcnt; \
129 cp = (unsigned char*) tif->tif_rawcp; \
130 ep = cp + tif->tif_rawcc; \
133 * Save state possibly changed during decoding.
135 #define UNCACHE_STATE(tif, sp) do { \
136 sp->bit = BitsAvail; \
138 sp->EOLcnt = EOLcnt; \
139 tif->tif_rawcc -= (tmsize_t)((uint8*) cp - tif->tif_rawcp); \
140 tif->tif_rawcp = (uint8*) cp; \
144 * Setup state for decoding a strip.
147 Fax3PreDecode(TIFF
* tif
, uint16 s
)
149 Fax3CodecState
* sp
= DecoderState(tif
);
153 sp
->bit
= 0; /* force initial read */
155 sp
->EOLcnt
= 0; /* force initial scan for EOL */
157 * Decoder assumes lsb-to-msb bit order. Note that we select
158 * this here rather than in Fax3SetupState so that viewers can
159 * hold the image open, fiddle with the FillOrder tag value,
160 * and then re-decode the image. Otherwise they'd need to close
161 * and open the image to get the state reset.
164 TIFFGetBitRevTable(tif
->tif_dir
.td_fillorder
!= FILLORDER_LSB2MSB
);
165 if (sp
->refruns
) { /* init reference line to white */
166 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 line
, uint32 a0
)
182 TIFFErrorExt(tif
->tif_clientdata
, module
, "Bad code word at line %u of %s %u (x %u)",
183 line
, isTiled(tif
) ? "tile" : "strip",
184 (isTiled(tif
) ? tif
->tif_curtile
: tif
->tif_curstrip
),
187 #define unexpected(table, a0) Fax3Unexpected(module, tif, sp->line, a0)
190 Fax3Extension(const char* module
, TIFF
* tif
, uint32 line
, uint32 a0
)
192 TIFFErrorExt(tif
->tif_clientdata
, module
,
193 "Uncompressed data (not supported) at line %u of %s %u (x %u)",
194 line
, isTiled(tif
) ? "tile" : "strip",
195 (isTiled(tif
) ? tif
->tif_curtile
: tif
->tif_curstrip
),
198 #define extension(a0) Fax3Extension(module, tif, sp->line, a0)
201 Fax3BadLength(const char* module
, TIFF
* tif
, uint32 line
, uint32 a0
, uint32 lastx
)
203 TIFFWarningExt(tif
->tif_clientdata
, module
, "%s at line %u of %s %u (got %u, expected %u)",
204 a0
< lastx
? "Premature EOL" : "Line length mismatch",
205 line
, isTiled(tif
) ? "tile" : "strip",
206 (isTiled(tif
) ? tif
->tif_curtile
: tif
->tif_curstrip
),
209 #define badlength(a0,lastx) Fax3BadLength(module, tif, sp->line, a0, lastx)
212 Fax3PrematureEOF(const char* module
, TIFF
* tif
, uint32 line
, uint32 a0
)
214 TIFFWarningExt(tif
->tif_clientdata
, module
, "Premature EOF at line %u of %s %u (x %u)",
215 line
, isTiled(tif
) ? "tile" : "strip",
216 (isTiled(tif
) ? tif
->tif_curtile
: tif
->tif_curstrip
),
219 #define prematureEOF(a0) Fax3PrematureEOF(module, tif, sp->line, a0)
224 * Decode the requested amount of G3 1D-encoded data.
227 Fax3Decode1D(TIFF
* tif
, uint8
* buf
, tmsize_t occ
, uint16 s
)
229 DECLARE_STATE(tif
, sp
, "Fax3Decode1D");
231 if (occ
% sp
->b
.rowbytes
)
233 TIFFErrorExt(tif
->tif_clientdata
, module
, "Fractional scanlines cannot be read");
236 CACHE_STATE(tif
, sp
);
237 thisrun
= sp
->curruns
;
243 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc
, BitsAvail
);
244 printf("-------------------- %d\n", tif
->tif_row
);
249 (*sp
->fill
)(buf
, thisrun
, pa
, lastx
);
250 buf
+= sp
->b
.rowbytes
;
251 occ
-= sp
->b
.rowbytes
;
254 EOF1D
: /* premature EOF */
256 EOF1Da
: /* premature EOF */
257 (*sp
->fill
)(buf
, thisrun
, pa
, lastx
);
258 UNCACHE_STATE(tif
, sp
);
261 UNCACHE_STATE(tif
, sp
);
265 #define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; }
267 * Decode the requested amount of G3 2D-encoded data.
270 Fax3Decode2D(TIFF
* tif
, uint8
* buf
, tmsize_t occ
, uint16 s
)
272 DECLARE_STATE_2D(tif
, sp
, "Fax3Decode2D");
273 int is1D
; /* current line is 1d/2d-encoded */
275 if (occ
% sp
->b
.rowbytes
)
277 TIFFErrorExt(tif
->tif_clientdata
, module
, "Fractional scanlines cannot be read");
280 CACHE_STATE(tif
, sp
);
284 pa
= thisrun
= sp
->curruns
;
286 printf("\nBitAcc=%08X, BitsAvail = %d EOLcnt = %d",
287 BitAcc
, BitsAvail
, EOLcnt
);
291 is1D
= GetBits(1); /* 1D/2D-encoding tag bit */
294 printf(" %s\n-------------------- %d\n",
295 is1D
? "1D" : "2D", tif
->tif_row
);
304 (*sp
->fill
)(buf
, thisrun
, pa
, lastx
);
305 SETVALUE(0); /* imaginary change for reference */
306 SWAP(uint32
*, sp
->curruns
, sp
->refruns
);
307 buf
+= sp
->b
.rowbytes
;
308 occ
-= sp
->b
.rowbytes
;
311 EOF2D
: /* premature EOF */
313 EOF2Da
: /* premature EOF */
314 (*sp
->fill
)(buf
, thisrun
, pa
, lastx
);
315 UNCACHE_STATE(tif
, sp
);
318 UNCACHE_STATE(tif
, sp
);
324 * The ZERO & FILL macros must handle spans < 2*sizeof(long) bytes.
325 * For machines with 64-bit longs this is <16 bytes; otherwise
326 * this is <8 bytes. We optimize the code here to reflect the
327 * machine characteristics.
329 #if SIZEOF_UNSIGNED_LONG == 8
330 # define FILL(n, cp) \
332 case 15:(cp)[14] = 0xff; /*-fallthrough*/ \
333 case 14:(cp)[13] = 0xff; /*-fallthrough*/ \
334 case 13:(cp)[12] = 0xff; /*-fallthrough*/ \
335 case 12:(cp)[11] = 0xff; /*-fallthrough*/ \
336 case 11:(cp)[10] = 0xff; /*-fallthrough*/ \
337 case 10: (cp)[9] = 0xff; /*-fallthrough*/ \
338 case 9: (cp)[8] = 0xff; /*-fallthrough*/ \
339 case 8: (cp)[7] = 0xff; /*-fallthrough*/ \
340 case 7: (cp)[6] = 0xff; /*-fallthrough*/ \
341 case 6: (cp)[5] = 0xff; /*-fallthrough*/ \
342 case 5: (cp)[4] = 0xff; /*-fallthrough*/ \
343 case 4: (cp)[3] = 0xff; /*-fallthrough*/ \
344 case 3: (cp)[2] = 0xff; /*-fallthrough*/ \
345 case 2: (cp)[1] = 0xff; /*-fallthrough*/ \
346 case 1: (cp)[0] = 0xff; (cp) += (n); /*-fallthrough*/ \
349 # define ZERO(n, cp) \
351 case 15:(cp)[14] = 0; /*-fallthrough*/ \
352 case 14:(cp)[13] = 0; /*-fallthrough*/ \
353 case 13:(cp)[12] = 0; /*-fallthrough*/ \
354 case 12:(cp)[11] = 0; /*-fallthrough*/ \
355 case 11:(cp)[10] = 0; /*-fallthrough*/ \
356 case 10: (cp)[9] = 0; /*-fallthrough*/ \
357 case 9: (cp)[8] = 0; /*-fallthrough*/ \
358 case 8: (cp)[7] = 0; /*-fallthrough*/ \
359 case 7: (cp)[6] = 0; /*-fallthrough*/ \
360 case 6: (cp)[5] = 0; /*-fallthrough*/ \
361 case 5: (cp)[4] = 0; /*-fallthrough*/ \
362 case 4: (cp)[3] = 0; /*-fallthrough*/ \
363 case 3: (cp)[2] = 0; /*-fallthrough*/ \
364 case 2: (cp)[1] = 0; /*-fallthrough*/ \
365 case 1: (cp)[0] = 0; (cp) += (n); /*-fallthrough*/ \
369 # define FILL(n, cp) \
371 case 7: (cp)[6] = 0xff; /*-fallthrough*/ \
372 case 6: (cp)[5] = 0xff; /*-fallthrough*/ \
373 case 5: (cp)[4] = 0xff; /*-fallthrough*/ \
374 case 4: (cp)[3] = 0xff; /*-fallthrough*/ \
375 case 3: (cp)[2] = 0xff; /*-fallthrough*/ \
376 case 2: (cp)[1] = 0xff; /*-fallthrough*/ \
377 case 1: (cp)[0] = 0xff; (cp) += (n); /*-fallthrough*/ \
380 # define ZERO(n, cp) \
382 case 7: (cp)[6] = 0; /*-fallthrough*/ \
383 case 6: (cp)[5] = 0; /*-fallthrough*/ \
384 case 5: (cp)[4] = 0; /*-fallthrough*/ \
385 case 4: (cp)[3] = 0; /*-fallthrough*/ \
386 case 3: (cp)[2] = 0; /*-fallthrough*/ \
387 case 2: (cp)[1] = 0; /*-fallthrough*/ \
388 case 1: (cp)[0] = 0; (cp) += (n); /*-fallthrough*/ \
394 * Bit-fill a row according to the white/black
395 * runs generated during G3/G4 decoding.
398 _TIFFFax3fillruns(unsigned char* buf
, uint32
* runs
, uint32
* erun
, uint32 lastx
)
400 static const unsigned char _fillmasks
[] =
401 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
410 for (; runs
< erun
; runs
+= 2) {
412 if (x
+run
> lastx
|| run
> lastx
)
413 run
= runs
[0] = (uint32
) (lastx
- x
);
418 if (bx
) { /* align to byte boundary */
419 *cp
++ &= 0xff << (8-bx
);
422 if( (n
= run
>> 3) != 0 ) { /* multiple bytes to fill */
423 if ((n
/sizeof (long)) > 1) {
425 * Align to longword boundary and fill.
427 for (; n
&& !isAligned(cp
, long); n
--)
430 nw
= (int32
)(n
/ sizeof (long));
431 n
-= nw
* sizeof (long);
435 cp
= (unsigned char*) lp
;
441 cp
[0] &= 0xff >> run
;
443 cp
[0] &= ~(_fillmasks
[run
]>>bx
);
447 if (x
+run
> lastx
|| run
> lastx
)
448 run
= runs
[1] = lastx
- x
;
453 if (bx
) { /* align to byte boundary */
457 if( (n
= run
>>3) != 0 ) { /* multiple bytes to fill */
458 if ((n
/sizeof (long)) > 1) {
460 * Align to longword boundary and fill.
462 for (; n
&& !isAligned(cp
, long); n
--)
465 nw
= (int32
)(n
/ sizeof (long));
466 n
-= nw
* sizeof (long);
470 cp
= (unsigned char*) lp
;
475 /* Explicit 0xff masking to make icc -check=conversions happy */
477 cp
[0] = (unsigned char)((cp
[0] | (0xff00 >> run
))&0xff);
479 cp
[0] |= _fillmasks
[run
]>>bx
;
489 Fax3FixupTags(TIFF
* tif
)
496 * Setup G3/G4-related compression/decompression state
497 * before data is processed. This routine is called once
498 * per image -- it sets up different state based on whether
499 * or not decoding or encoding is being done and whether
500 * 1D- or 2D-encoded data is involved.
503 Fax3SetupState(TIFF
* tif
)
505 static const char module
[] = "Fax3SetupState";
506 TIFFDirectory
* td
= &tif
->tif_dir
;
507 Fax3BaseState
* sp
= Fax3State(tif
);
509 Fax3CodecState
* dsp
= (Fax3CodecState
*) Fax3State(tif
);
511 uint32 rowpixels
, nruns
;
513 if (td
->td_bitspersample
!= 1) {
514 TIFFErrorExt(tif
->tif_clientdata
, module
,
515 "Bits/sample must be 1 for Group 3/4 encoding/decoding");
519 * Calculate the scanline/tile widths.
522 rowbytes
= TIFFTileRowSize(tif
);
523 rowpixels
= td
->td_tilewidth
;
525 rowbytes
= TIFFScanlineSize(tif
);
526 rowpixels
= td
->td_imagewidth
;
528 sp
->rowbytes
= rowbytes
;
529 sp
->rowpixels
= rowpixels
;
531 * Allocate any additional space required for decoding/encoding.
534 (sp
->groupoptions
& GROUP3OPT_2DENCODING
) ||
535 td
->td_compression
== COMPRESSION_CCITTFAX4
539 Assure that allocation computations do not overflow.
541 TIFFroundup and TIFFSafeMultiply return zero on integer overflow
543 dsp
->runs
=(uint32
*) NULL
;
544 nruns
= TIFFroundup_32(rowpixels
,32);
546 nruns
= TIFFSafeMultiply(uint32
,nruns
,2);
548 if ((nruns
== 0) || (TIFFSafeMultiply(uint32
,nruns
,2) == 0)) {
549 TIFFErrorExt(tif
->tif_clientdata
, tif
->tif_name
,
550 "Row pixels integer overflow (rowpixels %u)",
554 dsp
->runs
= (uint32
*) _TIFFCheckMalloc(tif
,
555 TIFFSafeMultiply(uint32
,nruns
,2),
557 "for Group 3/4 run arrays");
558 if (dsp
->runs
== NULL
)
560 memset( dsp
->runs
, 0, TIFFSafeMultiply(uint32
,nruns
,2)*sizeof(uint32
));
561 dsp
->curruns
= dsp
->runs
;
563 dsp
->refruns
= dsp
->runs
+ nruns
;
566 if (td
->td_compression
== COMPRESSION_CCITTFAX3
567 && is2DEncoding(dsp
)) { /* NB: default is 1D routine */
568 tif
->tif_decoderow
= Fax3Decode2D
;
569 tif
->tif_decodestrip
= Fax3Decode2D
;
570 tif
->tif_decodetile
= Fax3Decode2D
;
573 if (needsRefLine
) { /* 2d encoding */
574 Fax3CodecState
* esp
= EncoderState(tif
);
576 * 2d encoding requires a scanline
577 * buffer for the ``reference line''; the
578 * scanline against which delta encoding
579 * is referenced. The reference line must
580 * be initialized to be ``white'' (done elsewhere).
582 esp
->refline
= (unsigned char*) _TIFFmalloc(rowbytes
);
583 if (esp
->refline
== NULL
) {
584 TIFFErrorExt(tif
->tif_clientdata
, module
,
585 "No space for Group 3/4 reference line");
588 } else /* 1d encoding */
589 EncoderState(tif
)->refline
= NULL
;
595 * CCITT Group 3 FAX Encoding.
598 #define Fax3FlushBits(tif, sp) { \
599 if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
600 (void) TIFFFlushData1(tif); \
601 *(tif)->tif_rawcp++ = (uint8) (sp)->data; \
602 (tif)->tif_rawcc++; \
603 (sp)->data = 0, (sp)->bit = 8; \
605 #define _FlushBits(tif) { \
606 if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
607 (void) TIFFFlushData1(tif); \
608 *(tif)->tif_rawcp++ = (uint8) data; \
609 (tif)->tif_rawcc++; \
612 static const int _msbmask
[9] =
613 { 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff };
614 #define _PutBits(tif, bits, length) { \
615 while (length > bit) { \
616 data |= bits >> (length - bit); \
620 assert( length < 9 ); \
621 data |= (bits & _msbmask[length]) << (bit - length); \
628 * Write a variable-length bit-value to
629 * the output stream. Values are
630 * assumed to be at most 16 bits.
633 Fax3PutBits(TIFF
* tif
, unsigned int bits
, unsigned int length
)
635 Fax3CodecState
* sp
= EncoderState(tif
);
636 unsigned int bit
= sp
->bit
;
639 _PutBits(tif
, bits
, length
);
646 * Write a code to the output stream.
648 #define putcode(tif, te) Fax3PutBits(tif, (te)->code, (te)->length)
651 #define DEBUG_COLOR(w) (tab == TIFFFaxWhiteCodes ? w "W" : w "B")
652 #define DEBUG_PRINT(what,len) { \
654 printf("%08X/%-2d: %s%5d\t", data, bit, DEBUG_COLOR(what), len); \
655 for (t = length-1; t >= 0; t--) \
656 putchar(code & (1<<t) ? '1' : '0'); \
662 * Write the sequence of codes that describes
663 * the specified span of zero's or one's. The
664 * appropriate table that holds the make-up and
665 * terminating codes is supplied.
668 putspan(TIFF
* tif
, int32 span
, const tableentry
* tab
)
670 Fax3CodecState
* sp
= EncoderState(tif
);
671 unsigned int bit
= sp
->bit
;
673 unsigned int code
, length
;
675 while (span
>= 2624) {
676 const tableentry
* te
= &tab
[63 + (2560>>6)];
680 DEBUG_PRINT("MakeUp", te
->runlen
);
682 _PutBits(tif
, code
, length
);
686 const tableentry
* te
= &tab
[63 + (span
>>6)];
687 assert(te
->runlen
== 64*(span
>>6));
691 DEBUG_PRINT("MakeUp", te
->runlen
);
693 _PutBits(tif
, code
, length
);
696 code
= tab
[span
].code
;
697 length
= tab
[span
].length
;
699 DEBUG_PRINT(" Term", tab
[span
].runlen
);
701 _PutBits(tif
, code
, length
);
708 * Write an EOL code to the output stream. The zero-fill
709 * logic for byte-aligning encoded scanlines is handled
710 * here. We also handle writing the tag bit for the next
711 * scanline when doing 2d encoding.
714 Fax3PutEOL(TIFF
* tif
)
716 Fax3CodecState
* sp
= EncoderState(tif
);
717 unsigned int bit
= sp
->bit
;
719 unsigned int code
, length
, tparm
;
721 if (sp
->b
.groupoptions
& GROUP3OPT_FILLBITS
) {
723 * Force bit alignment so EOL will terminate on
724 * a byte boundary. That is, force the bit alignment
725 * to 16-12 = 4 before putting out the EOL code.
728 if (align
!= sp
->bit
) {
730 align
= sp
->bit
+ (8 - align
);
732 align
= sp
->bit
- align
;
734 _PutBits(tif
, 0, tparm
);
739 if (is2DEncoding(sp
)) {
740 code
= (code
<<1) | (sp
->tag
== G3_1D
);
743 _PutBits(tif
, code
, length
);
750 * Reset encoding state at the start of a strip.
753 Fax3PreEncode(TIFF
* tif
, uint16 s
)
755 Fax3CodecState
* sp
= EncoderState(tif
);
763 * This is necessary for Group 4; otherwise it isn't
764 * needed because the first scanline of each strip ends
765 * up being copied into the refline.
768 _TIFFmemset(sp
->refline
, 0x00, sp
->b
.rowbytes
);
769 if (is2DEncoding(sp
)) {
770 float res
= tif
->tif_dir
.td_yresolution
;
772 * The CCITT spec says that when doing 2d encoding, you
773 * should only do it on K consecutive scanlines, where K
774 * depends on the resolution of the image being encoded
775 * (2 for <= 200 lpi, 4 for > 200 lpi). Since the directory
776 * code initializes td_yresolution to 0, this code will
777 * select a K of 2 unless the YResolution tag is set
778 * appropriately. (Note also that we fudge a little here
779 * and use 150 lpi to avoid problems with units conversion.)
781 if (tif
->tif_dir
.td_resolutionunit
== RESUNIT_CENTIMETER
)
782 res
*= 2.54f
; /* convert to inches */
783 sp
->maxk
= (res
> 150 ? 4 : 2);
786 sp
->k
= sp
->maxk
= 0;
791 static const unsigned char zeroruns
[256] = {
792 8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, /* 0x00 - 0x0f */
793 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0x10 - 0x1f */
794 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x20 - 0x2f */
795 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x30 - 0x3f */
796 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x40 - 0x4f */
797 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x50 - 0x5f */
798 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x60 - 0x6f */
799 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x70 - 0x7f */
800 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x80 - 0x8f */
801 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x90 - 0x9f */
802 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xa0 - 0xaf */
803 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xb0 - 0xbf */
804 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xc0 - 0xcf */
805 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xd0 - 0xdf */
806 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xe0 - 0xef */
807 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xf0 - 0xff */
809 static const unsigned char oneruns
[256] = {
810 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x00 - 0x0f */
811 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x10 - 0x1f */
812 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x20 - 0x2f */
813 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x30 - 0x3f */
814 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x40 - 0x4f */
815 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x50 - 0x5f */
816 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x60 - 0x6f */
817 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x70 - 0x7f */
818 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x80 - 0x8f */
819 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x90 - 0x9f */
820 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xa0 - 0xaf */
821 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xb0 - 0xbf */
822 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xc0 - 0xcf */
823 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xd0 - 0xdf */
824 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0xe0 - 0xef */
825 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 8, /* 0xf0 - 0xff */
829 * On certain systems it pays to inline
830 * the routines that find pixel spans.
833 static int32
find0span(unsigned char*, int32
, int32
);
834 static int32
find1span(unsigned char*, int32
, int32
);
835 #pragma inline(find0span,find1span)
839 * Find a span of ones or zeros using the supplied
840 * table. The ``base'' of the bit string is supplied
841 * along with the start+end bit indices.
844 find0span(unsigned char* bp
, int32 bs
, int32 be
)
846 int32 bits
= be
- bs
;
851 * Check partial byte on lhs.
853 if (bits
> 0 && (n
= (bs
& 7)) != 0) {
854 span
= zeroruns
[(*bp
<< n
) & 0xff];
855 if (span
> 8-n
) /* table value too generous */
857 if (span
> bits
) /* constrain span to bit range */
859 if (n
+span
< 8) /* doesn't extend to edge of byte */
865 if (bits
>= (int32
)(2 * 8 * sizeof(long))) {
868 * Align to longword boundary and check longwords.
870 while (!isAligned(bp
, long)) {
872 return (span
+ zeroruns
[*bp
]);
878 while ((bits
>= (int32
)(8 * sizeof(long))) && (0 == *lp
)) {
879 span
+= 8*sizeof (long);
880 bits
-= 8*sizeof (long);
883 bp
= (unsigned char*) lp
;
886 * Scan full bytes for all 0's.
889 if (*bp
!= 0x00) /* end of run */
890 return (span
+ zeroruns
[*bp
]);
896 * Check partial byte on rhs.
900 span
+= (n
> bits
? bits
: n
);
906 find1span(unsigned char* bp
, int32 bs
, int32 be
)
908 int32 bits
= be
- bs
;
913 * Check partial byte on lhs.
915 if (bits
> 0 && (n
= (bs
& 7)) != 0) {
916 span
= oneruns
[(*bp
<< n
) & 0xff];
917 if (span
> 8-n
) /* table value too generous */
919 if (span
> bits
) /* constrain span to bit range */
921 if (n
+span
< 8) /* doesn't extend to edge of byte */
927 if (bits
>= (int32
)(2 * 8 * sizeof(long))) {
930 * Align to longword boundary and check longwords.
932 while (!isAligned(bp
, long)) {
934 return (span
+ oneruns
[*bp
]);
940 while ((bits
>= (int32
)(8 * sizeof(long))) && (~0 == *lp
)) {
941 span
+= 8*sizeof (long);
942 bits
-= 8*sizeof (long);
945 bp
= (unsigned char*) lp
;
948 * Scan full bytes for all 1's.
951 if (*bp
!= 0xff) /* end of run */
952 return (span
+ oneruns
[*bp
]);
958 * Check partial byte on rhs.
962 span
+= (n
> bits
? bits
: n
);
968 * Return the offset of the next bit in the range
969 * [bs..be] that is different from the specified
970 * color. The end, be, is returned if no such bit
973 #define finddiff(_cp, _bs, _be, _color) \
974 (_bs + (_color ? find1span(_cp,_bs,_be) : find0span(_cp,_bs,_be)))
976 * Like finddiff, but also check the starting bit
977 * against the end in case start > end.
979 #define finddiff2(_cp, _bs, _be, _color) \
980 (_bs < _be ? finddiff(_cp,_bs,_be,_color) : _be)
983 * 1d-encode a row of pixels. The encoding is
984 * a sequence of all-white or all-black spans
985 * of pixels encoded with Huffman codes.
988 Fax3Encode1DRow(TIFF
* tif
, unsigned char* bp
, uint32 bits
)
990 Fax3CodecState
* sp
= EncoderState(tif
);
995 span
= find0span(bp
, bs
, bits
); /* white span */
996 putspan(tif
, span
, TIFFFaxWhiteCodes
);
1000 span
= find1span(bp
, bs
, bits
); /* black span */
1001 putspan(tif
, span
, TIFFFaxBlackCodes
);
1006 if (sp
->b
.mode
& (FAXMODE_BYTEALIGN
|FAXMODE_WORDALIGN
)) {
1007 if (sp
->bit
!= 8) /* byte-align */
1008 Fax3FlushBits(tif
, sp
);
1009 if ((sp
->b
.mode
&FAXMODE_WORDALIGN
) &&
1010 !isAligned(tif
->tif_rawcp
, uint16
))
1011 Fax3FlushBits(tif
, sp
);
1016 static const tableentry horizcode
=
1017 { 3, 0x1, 0 }; /* 001 */
1018 static const tableentry passcode
=
1019 { 4, 0x1, 0 }; /* 0001 */
1020 static const tableentry vcodes
[7] = {
1021 { 7, 0x03, 0 }, /* 0000 011 */
1022 { 6, 0x03, 0 }, /* 0000 11 */
1023 { 3, 0x03, 0 }, /* 011 */
1024 { 1, 0x1, 0 }, /* 1 */
1025 { 3, 0x2, 0 }, /* 010 */
1026 { 6, 0x02, 0 }, /* 0000 10 */
1027 { 7, 0x02, 0 } /* 0000 010 */
1031 * 2d-encode a row of pixels. Consult the CCITT
1032 * documentation for the algorithm.
1035 Fax3Encode2DRow(TIFF
* tif
, unsigned char* bp
, unsigned char* rp
, uint32 bits
)
1037 #define PIXEL(buf,ix) ((((buf)[(ix)>>3]) >> (7-((ix)&7))) & 1)
1039 uint32 a1
= (PIXEL(bp
, 0) != 0 ? 0 : finddiff(bp
, 0, bits
, 0));
1040 uint32 b1
= (PIXEL(rp
, 0) != 0 ? 0 : finddiff(rp
, 0, bits
, 0));
1044 b2
= finddiff2(rp
, b1
, bits
, PIXEL(rp
,b1
));
1046 /* Naive computation triggers -fsanitize=undefined,unsigned-integer-overflow */
1047 /* although it is correct unless the difference between both is < 31 bit */
1048 /* int32 d = b1 - a1; */
1049 int32 d
= (b1
>= a1
&& b1
- a1
<= 3U) ? (int32
)(b1
- a1
):
1050 (b1
< a1
&& a1
- b1
<= 3U) ? -(int32
)(a1
- b1
) : 0x7FFFFFFF;
1051 if (!(-3 <= d
&& d
<= 3)) { /* horizontal mode */
1052 a2
= finddiff2(bp
, a1
, bits
, PIXEL(bp
,a1
));
1053 putcode(tif
, &horizcode
);
1054 if (a0
+a1
== 0 || PIXEL(bp
, a0
) == 0) {
1055 putspan(tif
, a1
-a0
, TIFFFaxWhiteCodes
);
1056 putspan(tif
, a2
-a1
, TIFFFaxBlackCodes
);
1058 putspan(tif
, a1
-a0
, TIFFFaxBlackCodes
);
1059 putspan(tif
, a2
-a1
, TIFFFaxWhiteCodes
);
1062 } else { /* vertical mode */
1063 putcode(tif
, &vcodes
[d
+3]);
1066 } else { /* pass mode */
1067 putcode(tif
, &passcode
);
1072 a1
= finddiff(bp
, a0
, bits
, PIXEL(bp
,a0
));
1073 b1
= finddiff(rp
, a0
, bits
, !PIXEL(bp
,a0
));
1074 b1
= finddiff(rp
, b1
, bits
, PIXEL(bp
,a0
));
1081 * Encode a buffer of pixels.
1084 Fax3Encode(TIFF
* tif
, uint8
* bp
, tmsize_t cc
, uint16 s
)
1086 static const char module
[] = "Fax3Encode";
1087 Fax3CodecState
* sp
= EncoderState(tif
);
1089 if (cc
% sp
->b
.rowbytes
)
1091 TIFFErrorExt(tif
->tif_clientdata
, module
, "Fractional scanlines cannot be written");
1095 if ((sp
->b
.mode
& FAXMODE_NOEOL
) == 0)
1097 if (is2DEncoding(sp
)) {
1098 if (sp
->tag
== G3_1D
) {
1099 if (!Fax3Encode1DRow(tif
, bp
, sp
->b
.rowpixels
))
1103 if (!Fax3Encode2DRow(tif
, bp
, sp
->refline
,
1112 _TIFFmemcpy(sp
->refline
, bp
, sp
->b
.rowbytes
);
1114 if (!Fax3Encode1DRow(tif
, bp
, sp
->b
.rowpixels
))
1117 bp
+= sp
->b
.rowbytes
;
1118 cc
-= sp
->b
.rowbytes
;
1124 Fax3PostEncode(TIFF
* tif
)
1126 Fax3CodecState
* sp
= EncoderState(tif
);
1129 Fax3FlushBits(tif
, sp
);
1134 Fax3Close(TIFF
* tif
)
1136 if ((Fax3State(tif
)->mode
& FAXMODE_NORTC
) == 0 && tif
->tif_rawcp
) {
1137 Fax3CodecState
* sp
= EncoderState(tif
);
1138 unsigned int code
= EOL
;
1139 unsigned int length
= 12;
1142 if (is2DEncoding(sp
)) {
1143 code
= (code
<<1) | (sp
->tag
== G3_1D
);
1146 for (i
= 0; i
< 6; i
++)
1147 Fax3PutBits(tif
, code
, length
);
1148 Fax3FlushBits(tif
, sp
);
1153 Fax3Cleanup(TIFF
* tif
)
1155 Fax3CodecState
* sp
= DecoderState(tif
);
1159 tif
->tif_tagmethods
.vgetfield
= sp
->b
.vgetparent
;
1160 tif
->tif_tagmethods
.vsetfield
= sp
->b
.vsetparent
;
1161 tif
->tif_tagmethods
.printdir
= sp
->b
.printdir
;
1164 _TIFFfree(sp
->runs
);
1166 _TIFFfree(sp
->refline
);
1168 _TIFFfree(tif
->tif_data
);
1169 tif
->tif_data
= NULL
;
1171 _TIFFSetDefaultCompressionState(tif
);
1174 #define FIELD_BADFAXLINES (FIELD_CODEC+0)
1175 #define FIELD_CLEANFAXDATA (FIELD_CODEC+1)
1176 #define FIELD_BADFAXRUN (FIELD_CODEC+2)
1178 #define FIELD_OPTIONS (FIELD_CODEC+7)
1180 static const TIFFField faxFields
[] = {
1181 { TIFFTAG_FAXMODE
, 0, 0, TIFF_ANY
, 0, TIFF_SETGET_INT
, TIFF_SETGET_UNDEFINED
, FIELD_PSEUDO
, FALSE
, FALSE
, "FaxMode", NULL
},
1182 { TIFFTAG_FAXFILLFUNC
, 0, 0, TIFF_ANY
, 0, TIFF_SETGET_OTHER
, TIFF_SETGET_UNDEFINED
, FIELD_PSEUDO
, FALSE
, FALSE
, "FaxFillFunc", NULL
},
1183 { TIFFTAG_BADFAXLINES
, 1, 1, TIFF_LONG
, 0, TIFF_SETGET_UINT32
, TIFF_SETGET_UINT32
, FIELD_BADFAXLINES
, TRUE
, FALSE
, "BadFaxLines", NULL
},
1184 { TIFFTAG_CLEANFAXDATA
, 1, 1, TIFF_SHORT
, 0, TIFF_SETGET_UINT16
, TIFF_SETGET_UINT16
, FIELD_CLEANFAXDATA
, TRUE
, FALSE
, "CleanFaxData", NULL
},
1185 { TIFFTAG_CONSECUTIVEBADFAXLINES
, 1, 1, TIFF_LONG
, 0, TIFF_SETGET_UINT32
, TIFF_SETGET_UINT32
, FIELD_BADFAXRUN
, TRUE
, FALSE
, "ConsecutiveBadFaxLines", NULL
}};
1186 static const TIFFField fax3Fields
[] = {
1187 { TIFFTAG_GROUP3OPTIONS
, 1, 1, TIFF_LONG
, 0, TIFF_SETGET_UINT32
, TIFF_SETGET_UINT32
, FIELD_OPTIONS
, FALSE
, FALSE
, "Group3Options", NULL
},
1189 static const TIFFField fax4Fields
[] = {
1190 { TIFFTAG_GROUP4OPTIONS
, 1, 1, TIFF_LONG
, 0, TIFF_SETGET_UINT32
, TIFF_SETGET_UINT32
, FIELD_OPTIONS
, FALSE
, FALSE
, "Group4Options", NULL
},
1194 Fax3VSetField(TIFF
* tif
, uint32 tag
, va_list ap
)
1196 Fax3BaseState
* sp
= Fax3State(tif
);
1197 const TIFFField
* fip
;
1200 assert(sp
->vsetparent
!= 0);
1203 case TIFFTAG_FAXMODE
:
1204 sp
->mode
= (int) va_arg(ap
, int);
1205 return 1; /* NB: pseudo tag */
1206 case TIFFTAG_FAXFILLFUNC
:
1207 DecoderState(tif
)->fill
= va_arg(ap
, TIFFFaxFillFunc
);
1208 return 1; /* NB: pseudo tag */
1209 case TIFFTAG_GROUP3OPTIONS
:
1210 /* XXX: avoid reading options if compression mismatches. */
1211 if (tif
->tif_dir
.td_compression
== COMPRESSION_CCITTFAX3
)
1212 sp
->groupoptions
= (uint32
) va_arg(ap
, uint32
);
1214 case TIFFTAG_GROUP4OPTIONS
:
1215 /* XXX: avoid reading options if compression mismatches. */
1216 if (tif
->tif_dir
.td_compression
== COMPRESSION_CCITTFAX4
)
1217 sp
->groupoptions
= (uint32
) va_arg(ap
, uint32
);
1219 case TIFFTAG_BADFAXLINES
:
1220 sp
->badfaxlines
= (uint32
) va_arg(ap
, uint32
);
1222 case TIFFTAG_CLEANFAXDATA
:
1223 sp
->cleanfaxdata
= (uint16
) va_arg(ap
, uint16_vap
);
1225 case TIFFTAG_CONSECUTIVEBADFAXLINES
:
1226 sp
->badfaxrun
= (uint32
) va_arg(ap
, uint32
);
1229 return (*sp
->vsetparent
)(tif
, tag
, ap
);
1232 if ((fip
= TIFFFieldWithTag(tif
, tag
)) != NULL
)
1233 TIFFSetFieldBit(tif
, fip
->field_bit
);
1237 tif
->tif_flags
|= TIFF_DIRTYDIRECT
;
1242 Fax3VGetField(TIFF
* tif
, uint32 tag
, va_list ap
)
1244 Fax3BaseState
* sp
= Fax3State(tif
);
1249 case TIFFTAG_FAXMODE
:
1250 *va_arg(ap
, int*) = sp
->mode
;
1252 case TIFFTAG_FAXFILLFUNC
:
1253 *va_arg(ap
, TIFFFaxFillFunc
*) = DecoderState(tif
)->fill
;
1255 case TIFFTAG_GROUP3OPTIONS
:
1256 case TIFFTAG_GROUP4OPTIONS
:
1257 *va_arg(ap
, uint32
*) = sp
->groupoptions
;
1259 case TIFFTAG_BADFAXLINES
:
1260 *va_arg(ap
, uint32
*) = sp
->badfaxlines
;
1262 case TIFFTAG_CLEANFAXDATA
:
1263 *va_arg(ap
, uint16
*) = sp
->cleanfaxdata
;
1265 case TIFFTAG_CONSECUTIVEBADFAXLINES
:
1266 *va_arg(ap
, uint32
*) = sp
->badfaxrun
;
1269 return (*sp
->vgetparent
)(tif
, tag
, ap
);
1275 Fax3PrintDir(TIFF
* tif
, FILE* fd
, long flags
)
1277 Fax3BaseState
* sp
= Fax3State(tif
);
1282 if (TIFFFieldSet(tif
,FIELD_OPTIONS
)) {
1283 const char* sep
= " ";
1284 if (tif
->tif_dir
.td_compression
== COMPRESSION_CCITTFAX4
) {
1285 fprintf(fd
, " Group 4 Options:");
1286 if (sp
->groupoptions
& GROUP4OPT_UNCOMPRESSED
)
1287 fprintf(fd
, "%suncompressed data", sep
);
1290 fprintf(fd
, " Group 3 Options:");
1291 if (sp
->groupoptions
& GROUP3OPT_2DENCODING
) {
1292 fprintf(fd
, "%s2-d encoding", sep
);
1295 if (sp
->groupoptions
& GROUP3OPT_FILLBITS
) {
1296 fprintf(fd
, "%sEOL padding", sep
);
1299 if (sp
->groupoptions
& GROUP3OPT_UNCOMPRESSED
)
1300 fprintf(fd
, "%suncompressed data", sep
);
1302 fprintf(fd
, " (%lu = 0x%lx)\n",
1303 (unsigned long) sp
->groupoptions
,
1304 (unsigned long) sp
->groupoptions
);
1306 if (TIFFFieldSet(tif
,FIELD_CLEANFAXDATA
)) {
1307 fprintf(fd
, " Fax Data:");
1308 switch (sp
->cleanfaxdata
) {
1309 case CLEANFAXDATA_CLEAN
:
1310 fprintf(fd
, " clean");
1312 case CLEANFAXDATA_REGENERATED
:
1313 fprintf(fd
, " receiver regenerated");
1315 case CLEANFAXDATA_UNCLEAN
:
1316 fprintf(fd
, " uncorrected errors");
1319 fprintf(fd
, " (%u = 0x%x)\n",
1320 sp
->cleanfaxdata
, sp
->cleanfaxdata
);
1322 if (TIFFFieldSet(tif
,FIELD_BADFAXLINES
))
1323 fprintf(fd
, " Bad Fax Lines: %lu\n",
1324 (unsigned long) sp
->badfaxlines
);
1325 if (TIFFFieldSet(tif
,FIELD_BADFAXRUN
))
1326 fprintf(fd
, " Consecutive Bad Fax Lines: %lu\n",
1327 (unsigned long) sp
->badfaxrun
);
1329 (*sp
->printdir
)(tif
, fd
, flags
);
1333 InitCCITTFax3(TIFF
* tif
)
1335 static const char module
[] = "InitCCITTFax3";
1339 * Merge codec-specific tag information.
1341 if (!_TIFFMergeFields(tif
, faxFields
, TIFFArrayCount(faxFields
))) {
1342 TIFFErrorExt(tif
->tif_clientdata
, "InitCCITTFax3",
1343 "Merging common CCITT Fax codec-specific tags failed");
1348 * Allocate state block so tag methods have storage to record values.
1350 tif
->tif_data
= (uint8
*)
1351 _TIFFmalloc(sizeof (Fax3CodecState
));
1353 if (tif
->tif_data
== NULL
) {
1354 TIFFErrorExt(tif
->tif_clientdata
, module
,
1355 "No space for state block");
1358 _TIFFmemset(tif
->tif_data
, 0, sizeof (Fax3CodecState
));
1360 sp
= Fax3State(tif
);
1361 sp
->rw_mode
= tif
->tif_mode
;
1364 * Override parent get/set field methods.
1366 sp
->vgetparent
= tif
->tif_tagmethods
.vgetfield
;
1367 tif
->tif_tagmethods
.vgetfield
= Fax3VGetField
; /* hook for codec tags */
1368 sp
->vsetparent
= tif
->tif_tagmethods
.vsetfield
;
1369 tif
->tif_tagmethods
.vsetfield
= Fax3VSetField
; /* hook for codec tags */
1370 sp
->printdir
= tif
->tif_tagmethods
.printdir
;
1371 tif
->tif_tagmethods
.printdir
= Fax3PrintDir
; /* hook for codec tags */
1372 sp
->groupoptions
= 0;
1374 if (sp
->rw_mode
== O_RDONLY
) /* FIXME: improve for in place update */
1375 tif
->tif_flags
|= TIFF_NOBITREV
; /* decoder does bit reversal */
1376 DecoderState(tif
)->runs
= NULL
;
1377 TIFFSetField(tif
, TIFFTAG_FAXFILLFUNC
, _TIFFFax3fillruns
);
1378 EncoderState(tif
)->refline
= NULL
;
1381 * Install codec methods.
1383 tif
->tif_fixuptags
= Fax3FixupTags
;
1384 tif
->tif_setupdecode
= Fax3SetupState
;
1385 tif
->tif_predecode
= Fax3PreDecode
;
1386 tif
->tif_decoderow
= Fax3Decode1D
;
1387 tif
->tif_decodestrip
= Fax3Decode1D
;
1388 tif
->tif_decodetile
= Fax3Decode1D
;
1389 tif
->tif_setupencode
= Fax3SetupState
;
1390 tif
->tif_preencode
= Fax3PreEncode
;
1391 tif
->tif_postencode
= Fax3PostEncode
;
1392 tif
->tif_encoderow
= Fax3Encode
;
1393 tif
->tif_encodestrip
= Fax3Encode
;
1394 tif
->tif_encodetile
= Fax3Encode
;
1395 tif
->tif_close
= Fax3Close
;
1396 tif
->tif_cleanup
= Fax3Cleanup
;
1402 TIFFInitCCITTFax3(TIFF
* tif
, int scheme
)
1405 if (InitCCITTFax3(tif
)) {
1407 * Merge codec-specific tag information.
1409 if (!_TIFFMergeFields(tif
, fax3Fields
,
1410 TIFFArrayCount(fax3Fields
))) {
1411 TIFFErrorExt(tif
->tif_clientdata
, "TIFFInitCCITTFax3",
1412 "Merging CCITT Fax 3 codec-specific tags failed");
1417 * The default format is Class/F-style w/o RTC.
1419 return TIFFSetField(tif
, TIFFTAG_FAXMODE
, FAXMODE_CLASSF
);
1425 * CCITT Group 4 (T.6) Facsimile-compatible
1426 * Compression Scheme Support.
1429 #define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; }
1431 * Decode the requested amount of G4-encoded data.
1434 Fax4Decode(TIFF
* tif
, uint8
* buf
, tmsize_t occ
, uint16 s
)
1436 DECLARE_STATE_2D(tif
, sp
, "Fax4Decode");
1438 if (occ
% sp
->b
.rowbytes
)
1440 TIFFErrorExt(tif
->tif_clientdata
, module
, "Fractional scanlines cannot be read");
1443 CACHE_STATE(tif
, sp
);
1447 pa
= thisrun
= sp
->curruns
;
1451 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc
, BitsAvail
);
1452 printf("-------------------- %d\n", tif
->tif_row
);
1458 (*sp
->fill
)(buf
, thisrun
, pa
, lastx
);
1459 SETVALUE(0); /* imaginary change for reference */
1460 SWAP(uint32
*, sp
->curruns
, sp
->refruns
);
1461 buf
+= sp
->b
.rowbytes
;
1462 occ
-= sp
->b
.rowbytes
;
1466 NeedBits16( 13, BADG4
);
1469 if( GetBits(13) != 0x1001 )
1470 fputs( "Bad EOFB\n", stderr
);
1473 (*sp
->fill
)(buf
, thisrun
, pa
, lastx
);
1474 UNCACHE_STATE(tif
, sp
);
1475 return ( sp
->line
? 1 : -1); /* don't error on badly-terminated strips */
1477 UNCACHE_STATE(tif
, sp
);
1483 * Encode the requested amount of data.
1486 Fax4Encode(TIFF
* tif
, uint8
* bp
, tmsize_t cc
, uint16 s
)
1488 static const char module
[] = "Fax4Encode";
1489 Fax3CodecState
*sp
= EncoderState(tif
);
1491 if (cc
% sp
->b
.rowbytes
)
1493 TIFFErrorExt(tif
->tif_clientdata
, module
, "Fractional scanlines cannot be written");
1497 if (!Fax3Encode2DRow(tif
, bp
, sp
->refline
, sp
->b
.rowpixels
))
1499 _TIFFmemcpy(sp
->refline
, bp
, sp
->b
.rowbytes
);
1500 bp
+= sp
->b
.rowbytes
;
1501 cc
-= sp
->b
.rowbytes
;
1507 Fax4PostEncode(TIFF
* tif
)
1509 Fax3CodecState
*sp
= EncoderState(tif
);
1511 /* terminate strip w/ EOFB */
1512 Fax3PutBits(tif
, EOL
, 12);
1513 Fax3PutBits(tif
, EOL
, 12);
1515 Fax3FlushBits(tif
, sp
);
1520 TIFFInitCCITTFax4(TIFF
* tif
, int scheme
)
1523 if (InitCCITTFax3(tif
)) { /* reuse G3 support */
1525 * Merge codec-specific tag information.
1527 if (!_TIFFMergeFields(tif
, fax4Fields
,
1528 TIFFArrayCount(fax4Fields
))) {
1529 TIFFErrorExt(tif
->tif_clientdata
, "TIFFInitCCITTFax4",
1530 "Merging CCITT Fax 4 codec-specific tags failed");
1534 tif
->tif_decoderow
= Fax4Decode
;
1535 tif
->tif_decodestrip
= Fax4Decode
;
1536 tif
->tif_decodetile
= Fax4Decode
;
1537 tif
->tif_encoderow
= Fax4Encode
;
1538 tif
->tif_encodestrip
= Fax4Encode
;
1539 tif
->tif_encodetile
= Fax4Encode
;
1540 tif
->tif_postencode
= Fax4PostEncode
;
1542 * Suppress RTC at the end of each strip.
1544 return TIFFSetField(tif
, TIFFTAG_FAXMODE
, FAXMODE_NORTC
);
1550 * CCITT Group 3 1-D Modified Huffman RLE Compression Support.
1551 * (Compression algorithms 2 and 32771)
1555 * Decode the requested amount of RLE-encoded data.
1558 Fax3DecodeRLE(TIFF
* tif
, uint8
* buf
, tmsize_t occ
, uint16 s
)
1560 DECLARE_STATE(tif
, sp
, "Fax3DecodeRLE");
1561 int mode
= sp
->b
.mode
;
1563 if (occ
% sp
->b
.rowbytes
)
1565 TIFFErrorExt(tif
->tif_clientdata
, module
, "Fractional scanlines cannot be read");
1568 CACHE_STATE(tif
, sp
);
1569 thisrun
= sp
->curruns
;
1575 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc
, BitsAvail
);
1576 printf("-------------------- %d\n", tif
->tif_row
);
1580 (*sp
->fill
)(buf
, thisrun
, pa
, lastx
);
1582 * Cleanup at the end of the row.
1584 if (mode
& FAXMODE_BYTEALIGN
) {
1585 int n
= BitsAvail
- (BitsAvail
&~ 7);
1587 } else if (mode
& FAXMODE_WORDALIGN
) {
1588 int n
= BitsAvail
- (BitsAvail
&~ 15);
1590 if (BitsAvail
== 0 && !isAligned(cp
, uint16
))
1593 buf
+= sp
->b
.rowbytes
;
1594 occ
-= sp
->b
.rowbytes
;
1597 EOFRLE
: /* premature EOF */
1598 (*sp
->fill
)(buf
, thisrun
, pa
, lastx
);
1599 UNCACHE_STATE(tif
, sp
);
1602 UNCACHE_STATE(tif
, sp
);
1607 TIFFInitCCITTRLE(TIFF
* tif
, int scheme
)
1610 if (InitCCITTFax3(tif
)) { /* reuse G3 support */
1611 tif
->tif_decoderow
= Fax3DecodeRLE
;
1612 tif
->tif_decodestrip
= Fax3DecodeRLE
;
1613 tif
->tif_decodetile
= Fax3DecodeRLE
;
1615 * Suppress RTC+EOLs when encoding and byte-align data.
1617 return TIFFSetField(tif
, TIFFTAG_FAXMODE
,
1618 FAXMODE_NORTC
|FAXMODE_NOEOL
|FAXMODE_BYTEALIGN
);
1624 TIFFInitCCITTRLEW(TIFF
* tif
, int scheme
)
1627 if (InitCCITTFax3(tif
)) { /* reuse G3 support */
1628 tif
->tif_decoderow
= Fax3DecodeRLE
;
1629 tif
->tif_decodestrip
= Fax3DecodeRLE
;
1630 tif
->tif_decodetile
= Fax3DecodeRLE
;
1632 * Suppress RTC+EOLs when encoding and word-align data.
1634 return TIFFSetField(tif
, TIFFTAG_FAXMODE
,
1635 FAXMODE_NORTC
|FAXMODE_NOEOL
|FAXMODE_WORDALIGN
);
1639 #endif /* CCITT_SUPPORT */
1641 /* vim: set ts=8 sts=8 sw=8 noet: */