/src/FreeImage/Source/LibTIFF/tif_fax3.c
C | 1626 lines | 1235 code | 112 blank | 279 comment | 212 complexity | eed115d889374fc6c108692da446a597 MD5 | raw file
1/* $Id: tif_fax3.c,v 1.37 2011/04/10 17:14:09 drolon Exp $ */ 2 3/* 4 * Copyright (c) 1990-1997 Sam Leffler 5 * Copyright (c) 1991-1997 Silicon Graphics, Inc. 6 * 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. 14 * 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. 18 * 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 24 * OF THIS SOFTWARE. 25 */ 26 27#include "tiffiop.h" 28#ifdef CCITT_SUPPORT 29/* 30 * TIFF Library. 31 * 32 * CCITT Group 3 (T.4) and Group 4 (T.6) Compression Support. 33 * 34 * This file contains support for decoding and encoding TIFF 35 * compression algorithms 2, 3, 4, and 32771. 36 * 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. 40 */ 41#include "tif_fax3.h" 42#define G3CODES 43#include "t4.h" 44#include <stdio.h> 45 46/* 47 * Compression+decompression state blocks are 48 * derived from this ``base state'' block. 49 */ 50typedef struct { 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 */ 55 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 */ 67} Fax3BaseState; 68#define Fax3State(tif) ((Fax3BaseState*) (tif)->tif_data) 69 70typedef enum { G3_1D, G3_2D } Ttag; 71typedef struct { 72 Fax3BaseState b; 73 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 */ 83 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 */ 89 90 int line; 91} Fax3CodecState; 92#define DecoderState(tif) ((Fax3CodecState*) Fax3State(tif)) 93#define EncoderState(tif) ((Fax3CodecState*) Fax3State(tif)) 94 95#define is2DEncoding(sp) \ 96 (sp->b.groupoptions & GROUP3OPT_2DENCODING) 97#define isAligned(p,t) ((((unsigned long)(p)) & (sizeof (t)-1)) == 0) 98 99/* 100 * Group 3 and Group 4 Decoding. 101 */ 102 103/* 104 * These macros glue the TIFF library state to 105 * the state expected by Frank's decoder. 106 */ 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 */\ 126/* 127 * Load any state that may be changed during decoding. 128 */ 129#define CACHE_STATE(tif, sp) do { \ 130 BitAcc = sp->data; \ 131 BitsAvail = sp->bit; \ 132 EOLcnt = sp->EOLcnt; \ 133 cp = (unsigned char*) tif->tif_rawcp; \ 134 ep = cp + tif->tif_rawcc; \ 135} while (0) 136/* 137 * Save state possibly changed during decoding. 138 */ 139#define UNCACHE_STATE(tif, sp) do { \ 140 sp->bit = BitsAvail; \ 141 sp->data = BitAcc; \ 142 sp->EOLcnt = EOLcnt; \ 143 tif->tif_rawcc -= (tidata_t) cp - tif->tif_rawcp; \ 144 tif->tif_rawcp = (tidata_t) cp; \ 145} while (0) 146 147/* 148 * Setup state for decoding a strip. 149 */ 150static int 151Fax3PreDecode(TIFF* tif, tsample_t s) 152{ 153 Fax3CodecState* sp = DecoderState(tif); 154 155 (void) s; 156 assert(sp != NULL); 157 sp->bit = 0; /* force initial read */ 158 sp->data = 0; 159 sp->EOLcnt = 0; /* force initial scan for EOL */ 160 /* 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. 166 */ 167 sp->bitmap = 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; 171 sp->refruns[1] = 0; 172 } 173 sp->line = 0; 174 return (1); 175} 176 177/* 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. 181 */ 182 183static void 184Fax3Unexpected(const char* module, TIFF* tif, uint32 line, uint32 a0) 185{ 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), 189 a0); 190} 191#define unexpected(table, a0) Fax3Unexpected(module, tif, sp->line, a0) 192 193static void 194Fax3Extension(const char* module, TIFF* tif, uint32 line, uint32 a0) 195{ 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), 200 a0); 201} 202#define extension(a0) Fax3Extension(module, tif, sp->line, a0) 203 204static void 205Fax3BadLength(const char* module, TIFF* tif, uint32 line, uint32 a0, uint32 lastx) 206{ 207 TIFFWarningExt(tif->tif_clientdata, module, "%s: %s at line %u of %s %u (got %u, expected %u)", 208 tif->tif_name, 209 a0 < lastx ? "Premature EOL" : "Line length mismatch", 210 line, isTiled(tif) ? "tile" : "strip", 211 (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), 212 a0, lastx); 213} 214#define badlength(a0,lastx) Fax3BadLength(module, tif, sp->line, a0, lastx) 215 216static void 217Fax3PrematureEOF(const char* module, TIFF* tif, uint32 line, uint32 a0) 218{ 219 TIFFWarningExt(tif->tif_clientdata, module, "%s: Premature EOF at line %u of %s %u (x %u)", 220 tif->tif_name, 221 line, isTiled(tif) ? "tile" : "strip", 222 (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), 223 a0); 224} 225#define prematureEOF(a0) Fax3PrematureEOF(module, tif, sp->line, a0) 226 227#define Nop 228 229/* 230 * Decode the requested amount of G3 1D-encoded data. 231 */ 232static int 233Fax3Decode1D(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s) 234{ 235 DECLARE_STATE(tif, sp, "Fax3Decode1D"); 236 237 (void) s; 238 CACHE_STATE(tif, sp); 239 thisrun = sp->curruns; 240 while ((long)occ > 0) { 241 a0 = 0; 242 RunLength = 0; 243 pa = thisrun; 244#ifdef FAX3_DEBUG 245 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail); 246 printf("-------------------- %d\n", tif->tif_row); 247 fflush(stdout); 248#endif 249 SYNC_EOL(EOF1D); 250 EXPAND1D(EOF1Da); 251 (*sp->fill)(buf, thisrun, pa, lastx); 252 buf += sp->b.rowbytes; 253 occ -= sp->b.rowbytes; 254 sp->line++; 255 continue; 256 EOF1D: /* premature EOF */ 257 CLEANUP_RUNS(); 258 EOF1Da: /* premature EOF */ 259 (*sp->fill)(buf, thisrun, pa, lastx); 260 UNCACHE_STATE(tif, sp); 261 return (-1); 262 } 263 UNCACHE_STATE(tif, sp); 264 return (1); 265} 266 267#define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; } 268/* 269 * Decode the requested amount of G3 2D-encoded data. 270 */ 271static int 272Fax3Decode2D(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s) 273{ 274 DECLARE_STATE_2D(tif, sp, "Fax3Decode2D"); 275 int is1D; /* current line is 1d/2d-encoded */ 276 277 (void) s; 278 CACHE_STATE(tif, sp); 279 while ((long)occ > 0) { 280 a0 = 0; 281 RunLength = 0; 282 pa = thisrun = sp->curruns; 283#ifdef FAX3_DEBUG 284 printf("\nBitAcc=%08X, BitsAvail = %d EOLcnt = %d", 285 BitAcc, BitsAvail, EOLcnt); 286#endif 287 SYNC_EOL(EOF2D); 288 NeedBits8(1, EOF2D); 289 is1D = GetBits(1); /* 1D/2D-encoding tag bit */ 290 ClrBits(1); 291#ifdef FAX3_DEBUG 292 printf(" %s\n-------------------- %d\n", 293 is1D ? "1D" : "2D", tif->tif_row); 294 fflush(stdout); 295#endif 296 pb = sp->refruns; 297 b1 = *pb++; 298 if (is1D) 299 EXPAND1D(EOF2Da); 300 else 301 EXPAND2D(EOF2Da); 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; 307 sp->line++; 308 continue; 309 EOF2D: /* premature EOF */ 310 CLEANUP_RUNS(); 311 EOF2Da: /* premature EOF */ 312 (*sp->fill)(buf, thisrun, pa, lastx); 313 UNCACHE_STATE(tif, sp); 314 return (-1); 315 } 316 UNCACHE_STATE(tif, sp); 317 return (1); 318} 319#undef SWAP 320 321/* 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. 326 */ 327#if SIZEOF_LONG == 8 328# define FILL(n, cp) \ 329 switch (n) { \ 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: ; \ 336 } 337# define ZERO(n, cp) \ 338 switch (n) { \ 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: ; \ 345 } 346#else 347# define FILL(n, cp) \ 348 switch (n) { \ 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: ; \ 352 } 353# define ZERO(n, cp) \ 354 switch (n) { \ 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: ; \ 358 } 359#endif 360 361/* 362 * Bit-fill a row according to the white/black 363 * runs generated during G3/G4 decoding. 364 */ 365void 366_TIFFFax3fillruns(unsigned char* buf, uint32* runs, uint32* erun, uint32 lastx) 367{ 368 static const unsigned char _fillmasks[] = 369 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff }; 370 unsigned char* cp; 371 uint32 x, bx, run; 372 int32 n, nw; 373 long* lp; 374 375 if ((erun-runs)&1) 376 *erun++ = 0; 377 x = 0; 378 for (; runs < erun; runs += 2) { 379 run = runs[0]; 380 if (x+run > lastx || run > lastx ) 381 run = runs[0] = (uint32) (lastx - x); 382 if (run) { 383 cp = buf + (x>>3); 384 bx = x&7; 385 if (run > 8-bx) { 386 if (bx) { /* align to byte boundary */ 387 *cp++ &= 0xff << (8-bx); 388 run -= 8-bx; 389 } 390 if( (n = run >> 3) != 0 ) { /* multiple bytes to fill */ 391 if ((n/sizeof (long)) > 1) { 392 /* 393 * Align to longword boundary and fill. 394 */ 395 for (; n && !isAligned(cp, long); n--) 396 *cp++ = 0x00; 397 lp = (long*) cp; 398 nw = (int32)(n / sizeof (long)); 399 n -= nw * sizeof (long); 400 do { 401 *lp++ = 0L; 402 } while (--nw); 403 cp = (unsigned char*) lp; 404 } 405 ZERO(n, cp); 406 run &= 7; 407 } 408 if (run) 409 cp[0] &= 0xff >> run; 410 } else 411 cp[0] &= ~(_fillmasks[run]>>bx); 412 x += runs[0]; 413 } 414 run = runs[1]; 415 if (x+run > lastx || run > lastx ) 416 run = runs[1] = lastx - x; 417 if (run) { 418 cp = buf + (x>>3); 419 bx = x&7; 420 if (run > 8-bx) { 421 if (bx) { /* align to byte boundary */ 422 *cp++ |= 0xff >> bx; 423 run -= 8-bx; 424 } 425 if( (n = run>>3) != 0 ) { /* multiple bytes to fill */ 426 if ((n/sizeof (long)) > 1) { 427 /* 428 * Align to longword boundary and fill. 429 */ 430 for (; n && !isAligned(cp, long); n--) 431 *cp++ = 0xff; 432 lp = (long*) cp; 433 nw = (int32)(n / sizeof (long)); 434 n -= nw * sizeof (long); 435 do { 436 *lp++ = -1L; 437 } while (--nw); 438 cp = (unsigned char*) lp; 439 } 440 FILL(n, cp); 441 run &= 7; 442 } 443 if (run) 444 cp[0] |= 0xff00 >> run; 445 } else 446 cp[0] |= _fillmasks[run]>>bx; 447 x += runs[1]; 448 } 449 } 450 assert(x == lastx); 451} 452#undef ZERO 453#undef FILL 454 455/* 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. 461 */ 462static int 463Fax3SetupState(TIFF* tif) 464{ 465 TIFFDirectory* td = &tif->tif_dir; 466 Fax3BaseState* sp = Fax3State(tif); 467 int needsRefLine; 468 Fax3CodecState* dsp = (Fax3CodecState*) Fax3State(tif); 469 uint32 rowbytes, rowpixels, nruns; 470 471 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"); 474 return (0); 475 } 476 /* 477 * Calculate the scanline/tile widths. 478 */ 479 if (isTiled(tif)) { 480 rowbytes = TIFFTileRowSize(tif); 481 rowpixels = td->td_tilewidth; 482 } else { 483 rowbytes = TIFFScanlineSize(tif); 484 rowpixels = td->td_imagewidth; 485 } 486 sp->rowbytes = (uint32) rowbytes; 487 sp->rowpixels = (uint32) rowpixels; 488 /* 489 * Allocate any additional space required for decoding/encoding. 490 */ 491 needsRefLine = ( 492 (sp->groupoptions & GROUP3OPT_2DENCODING) || 493 td->td_compression == COMPRESSION_CCITTFAX4 494 ); 495 496 /* 497 Assure that allocation computations do not overflow. 498 499 TIFFroundup and TIFFSafeMultiply return zero on integer overflow 500 */ 501 dsp->runs=(uint32*) NULL; 502 nruns = TIFFroundup(rowpixels,32); 503 if (needsRefLine) { 504 nruns = TIFFSafeMultiply(uint32,nruns,2); 505 } 506 if ((nruns == 0) || (TIFFSafeMultiply(uint32,nruns,2) == 0)) { 507 TIFFErrorExt(tif->tif_clientdata, tif->tif_name, 508 "Row pixels integer overflow (rowpixels %u)", 509 rowpixels); 510 return (0); 511 } 512 dsp->runs = (uint32*) _TIFFCheckMalloc(tif, 513 TIFFSafeMultiply(uint32,nruns,2), 514 sizeof (uint32), 515 "for Group 3/4 run arrays"); 516 if (dsp->runs == NULL) 517 return (0); 518 dsp->curruns = dsp->runs; 519 if (needsRefLine) 520 dsp->refruns = dsp->runs + nruns; 521 else 522 dsp->refruns = NULL; 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; 528 } 529 530 if (needsRefLine) { /* 2d encoding */ 531 Fax3CodecState* esp = EncoderState(tif); 532 /* 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). 538 */ 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", 543 tif->tif_name); 544 return (0); 545 } 546 } else /* 1d encoding */ 547 EncoderState(tif)->refline = NULL; 548 549 return (1); 550} 551 552/* 553 * CCITT Group 3 FAX Encoding. 554 */ 555 556#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; \ 562} 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++; \ 568 data = 0, bit = 8; \ 569} 570static 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); \ 575 length -= bit; \ 576 _FlushBits(tif); \ 577 } \ 578 data |= (bits & _msbmask[length]) << (bit - length); \ 579 bit -= length; \ 580 if (bit == 0) \ 581 _FlushBits(tif); \ 582} 583 584/* 585 * Write a variable-length bit-value to 586 * the output stream. Values are 587 * assumed to be at most 16 bits. 588 */ 589static void 590Fax3PutBits(TIFF* tif, unsigned int bits, unsigned int length) 591{ 592 Fax3CodecState* sp = EncoderState(tif); 593 unsigned int bit = sp->bit; 594 int data = sp->data; 595 596 _PutBits(tif, bits, length); 597 598 sp->data = data; 599 sp->bit = bit; 600} 601 602/* 603 * Write a code to the output stream. 604 */ 605#define putcode(tif, te) Fax3PutBits(tif, (te)->code, (te)->length) 606 607#ifdef FAX3_DEBUG 608#define DEBUG_COLOR(w) (tab == TIFFFaxWhiteCodes ? w "W" : w "B") 609#define DEBUG_PRINT(what,len) { \ 610 int t; \ 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'); \ 614 putchar('\n'); \ 615} 616#endif 617 618/* 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. 623 */ 624static void 625putspan(TIFF* tif, int32 span, const tableentry* tab) 626{ 627 Fax3CodecState* sp = EncoderState(tif); 628 unsigned int bit = sp->bit; 629 int data = sp->data; 630 unsigned int code, length; 631 632 while (span >= 2624) { 633 const tableentry* te = &tab[63 + (2560>>6)]; 634 code = te->code, length = te->length; 635#ifdef FAX3_DEBUG 636 DEBUG_PRINT("MakeUp", te->runlen); 637#endif 638 _PutBits(tif, code, length); 639 span -= te->runlen; 640 } 641 if (span >= 64) { 642 const tableentry* te = &tab[63 + (span>>6)]; 643 assert(te->runlen == 64*(span>>6)); 644 code = te->code, length = te->length; 645#ifdef FAX3_DEBUG 646 DEBUG_PRINT("MakeUp", te->runlen); 647#endif 648 _PutBits(tif, code, length); 649 span -= te->runlen; 650 } 651 code = tab[span].code, length = tab[span].length; 652#ifdef FAX3_DEBUG 653 DEBUG_PRINT(" Term", tab[span].runlen); 654#endif 655 _PutBits(tif, code, length); 656 657 sp->data = data; 658 sp->bit = bit; 659} 660 661/* 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. 666 */ 667static void 668Fax3PutEOL(TIFF* tif) 669{ 670 Fax3CodecState* sp = EncoderState(tif); 671 unsigned int bit = sp->bit; 672 int data = sp->data; 673 unsigned int code, length, tparm; 674 675 if (sp->b.groupoptions & GROUP3OPT_FILLBITS) { 676 /* 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. 680 */ 681 int align = 8 - 4; 682 if (align != sp->bit) { 683 if (align > sp->bit) 684 align = sp->bit + (8 - align); 685 else 686 align = sp->bit - align; 687 code = 0; 688 tparm=align; 689 _PutBits(tif, 0, tparm); 690 } 691 } 692 code = EOL, length = 12; 693 if (is2DEncoding(sp)) 694 code = (code<<1) | (sp->tag == G3_1D), length++; 695 _PutBits(tif, code, length); 696 697 sp->data = data; 698 sp->bit = bit; 699} 700 701/* 702 * Reset encoding state at the start of a strip. 703 */ 704static int 705Fax3PreEncode(TIFF* tif, tsample_t s) 706{ 707 Fax3CodecState* sp = EncoderState(tif); 708 709 (void) s; 710 assert(sp != NULL); 711 sp->bit = 8; 712 sp->data = 0; 713 sp->tag = G3_1D; 714 /* 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. 718 */ 719 if (sp->refline) 720 _TIFFmemset(sp->refline, 0x00, sp->b.rowbytes); 721 if (is2DEncoding(sp)) { 722 float res = tif->tif_dir.td_yresolution; 723 /* 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.) 732 */ 733 if (tif->tif_dir.td_resolutionunit == RESUNIT_CENTIMETER) 734 res *= 2.54f; /* convert to inches */ 735 sp->maxk = (res > 150 ? 4 : 2); 736 sp->k = sp->maxk-1; 737 } else 738 sp->k = sp->maxk = 0; 739 sp->line = 0; 740 return (1); 741} 742 743static 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 */ 760}; 761static 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 */ 778}; 779 780/* 781 * On certain systems it pays to inline 782 * the routines that find pixel spans. 783 */ 784#ifdef VAXC 785static int32 find0span(unsigned char*, int32, int32); 786static int32 find1span(unsigned char*, int32, int32); 787#pragma inline(find0span,find1span) 788#endif 789 790/* 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. 794 */ 795static int32 796find0span(unsigned char* bp, int32 bs, int32 be) 797{ 798 int32 bits = be - bs; 799 int32 n, span; 800 801 bp += bs>>3; 802 /* 803 * Check partial byte on lhs. 804 */ 805 if (bits > 0 && (n = (bs & 7))) { 806 span = zeroruns[(*bp << n) & 0xff]; 807 if (span > 8-n) /* table value too generous */ 808 span = 8-n; 809 if (span > bits) /* constrain span to bit range */ 810 span = bits; 811 if (n+span < 8) /* doesn't extend to edge of byte */ 812 return (span); 813 bits -= span; 814 bp++; 815 } else 816 span = 0; 817 if (bits >= (int32)(2 * 8 * sizeof(long))) { 818 long* lp; 819 /* 820 * Align to longword boundary and check longwords. 821 */ 822 while (!isAligned(bp, long)) { 823 if (*bp != 0x00) 824 return (span + zeroruns[*bp]); 825 span += 8, bits -= 8; 826 bp++; 827 } 828 lp = (long*) bp; 829 while ((bits >= (int32)(8 * sizeof(long))) && (0 == *lp)) { 830 span += 8*sizeof (long), bits -= 8*sizeof (long); 831 lp++; 832 } 833 bp = (unsigned char*) lp; 834 } 835 /* 836 * Scan full bytes for all 0's. 837 */ 838 while (bits >= 8) { 839 if (*bp != 0x00) /* end of run */ 840 return (span + zeroruns[*bp]); 841 span += 8, bits -= 8; 842 bp++; 843 } 844 /* 845 * Check partial byte on rhs. 846 */ 847 if (bits > 0) { 848 n = zeroruns[*bp]; 849 span += (n > bits ? bits : n); 850 } 851 return (span); 852} 853 854static int32 855find1span(unsigned char* bp, int32 bs, int32 be) 856{ 857 int32 bits = be - bs; 858 int32 n, span; 859 860 bp += bs>>3; 861 /* 862 * Check partial byte on lhs. 863 */ 864 if (bits > 0 && (n = (bs & 7))) { 865 span = oneruns[(*bp << n) & 0xff]; 866 if (span > 8-n) /* table value too generous */ 867 span = 8-n; 868 if (span > bits) /* constrain span to bit range */ 869 span = bits; 870 if (n+span < 8) /* doesn't extend to edge of byte */ 871 return (span); 872 bits -= span; 873 bp++; 874 } else 875 span = 0; 876 if (bits >= (int32)(2 * 8 * sizeof(long))) { 877 long* lp; 878 /* 879 * Align to longword boundary and check longwords. 880 */ 881 while (!isAligned(bp, long)) { 882 if (*bp != 0xff) 883 return (span + oneruns[*bp]); 884 span += 8, bits -= 8; 885 bp++; 886 } 887 lp = (long*) bp; 888 while ((bits >= (int32)(8 * sizeof(long))) && (~0 == *lp)) { 889 span += 8*sizeof (long), bits -= 8*sizeof (long); 890 lp++; 891 } 892 bp = (unsigned char*) lp; 893 } 894 /* 895 * Scan full bytes for all 1's. 896 */ 897 while (bits >= 8) { 898 if (*bp != 0xff) /* end of run */ 899 return (span + oneruns[*bp]); 900 span += 8, bits -= 8; 901 bp++; 902 } 903 /* 904 * Check partial byte on rhs. 905 */ 906 if (bits > 0) { 907 n = oneruns[*bp]; 908 span += (n > bits ? bits : n); 909 } 910 return (span); 911} 912 913/* 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 917 * exists. 918 */ 919#define finddiff(_cp, _bs, _be, _color) \ 920 (_bs + (_color ? find1span(_cp,_bs,_be) : find0span(_cp,_bs,_be))) 921/* 922 * Like finddiff, but also check the starting bit 923 * against the end in case start > end. 924 */ 925#define finddiff2(_cp, _bs, _be, _color) \ 926 (_bs < _be ? finddiff(_cp,_bs,_be,_color) : _be) 927 928/* 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. 932 */ 933static int 934Fax3Encode1DRow(TIFF* tif, unsigned char* bp, uint32 bits) 935{ 936 Fax3CodecState* sp = EncoderState(tif); 937 int32 span; 938 uint32 bs = 0; 939 940 for (;;) { 941 span = find0span(bp, bs, bits); /* white span */ 942 putspan(tif, span, TIFFFaxWhiteCodes); 943 bs += span; 944 if (bs >= bits) 945 break; 946 span = find1span(bp, bs, bits); /* black span */ 947 putspan(tif, span, TIFFFaxBlackCodes); 948 bs += span; 949 if (bs >= bits) 950 break; 951 } 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); 958 } 959 return (1); 960} 961 962static const tableentry horizcode = 963 { 3, 0x1, 0 }; /* 001 */ 964static const tableentry passcode = 965 { 4, 0x1, 0 }; /* 0001 */ 966static 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 */ 974}; 975 976/* 977 * 2d-encode a row of pixels. Consult the CCITT 978 * documentation for the algorithm. 979 */ 980static int 981Fax3Encode2DRow(TIFF* tif, unsigned char* bp, unsigned char* rp, uint32 bits) 982{ 983#define PIXEL(buf,ix) ((((buf)[(ix)>>3]) >> (7-((ix)&7))) & 1) 984 uint32 a0 = 0; 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)); 987 uint32 a2, b2; 988 989 for (;;) { 990 b2 = finddiff2(rp, b1, bits, PIXEL(rp,b1)); 991 if (b2 >= a1) { 992 int32 d = b1 - a1; 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); 999 } else { 1000 putspan(tif, a1-a0, TIFFFaxBlackCodes); 1001 putspan(tif, a2-a1, TIFFFaxWhiteCodes); 1002 } 1003 a0 = a2; 1004 } else { /* vertical mode */ 1005 putcode(tif, &vcodes[d+3]); 1006 a0 = a1; 1007 } 1008 } else { /* pass mode */ 1009 putcode(tif, &passcode); 1010 a0 = b2; 1011 } 1012 if (a0 >= bits) 1013 break; 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)); 1017 } 1018 return (1); 1019#undef PIXEL 1020} 1021 1022/* 1023 * Encode a buffer of pixels. 1024 */ 1025static int 1026Fax3Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s) 1027{ 1028 Fax3CodecState* sp = EncoderState(tif); 1029 1030 (void) s; 1031 while ((long)cc > 0) { 1032 if ((sp->b.mode & FAXMODE_NOEOL) == 0) 1033 Fax3PutEOL(tif); 1034 if (is2DEncoding(sp)) { 1035 if (sp->tag == G3_1D) { 1036 if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels)) 1037 return (0); 1038 sp->tag = G3_2D; 1039 } else { 1040 if (!Fax3Encode2DRow(tif, bp, sp->refline, 1041 sp->b.rowpixels)) 1042 return (0); 1043 sp->k--; 1044 } 1045 if (sp->k == 0) { 1046 sp->tag = G3_1D; 1047 sp->k = sp->maxk-1; 1048 } else 1049 _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes); 1050 } else { 1051 if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels)) 1052 return (0); 1053 } 1054 bp += sp->b.rowbytes; 1055 cc -= sp->b.rowbytes; 1056 } 1057 return (1); 1058} 1059 1060static int 1061Fax3PostEncode(TIFF* tif) 1062{ 1063 Fax3CodecState* sp = EncoderState(tif); 1064 1065 if (sp->bit != 8) 1066 Fax3FlushBits(tif, sp); 1067 return (1); 1068} 1069 1070static void 1071Fax3Close(TIFF* tif) 1072{ 1073 if ((Fax3State(tif)->mode & FAXMODE_NORTC) == 0) { 1074 Fax3CodecState* sp = EncoderState(tif); 1075 unsigned int code = EOL; 1076 unsigned int length = 12; 1077 int i; 1078 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); 1084 } 1085} 1086 1087static void 1088Fax3Cleanup(TIFF* tif) 1089{ 1090 Fax3CodecState* sp = DecoderState(tif); 1091 1092 assert(sp != 0); 1093 1094 tif->tif_tagmethods.vgetfield = sp->b.vgetparent; 1095 tif->tif_tagmethods.vsetfield = sp->b.vsetparent; 1096 tif->tif_tagmethods.printdir = sp->b.printdir; 1097 1098 if (sp->runs) 1099 _TIFFfree(sp->runs); 1100 if (sp->refline) 1101 _TIFFfree(sp->refline); 1102 1103 if (Fax3State(tif)->subaddress) 1104 _TIFFfree(Fax3State(tif)->subaddress); 1105 if (Fax3State(tif)->faxdcs) 1106 _TIFFfree(Fax3State(tif)->faxdcs); 1107 1108 _TIFFfree(tif->tif_data); 1109 tif->tif_data = NULL; 1110 1111 _TIFFSetDefaultCompressionState(tif); 1112} 1113 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) 1121 1122#define FIELD_OPTIONS (FIELD_CODEC+7) 1123 1124static 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" }, 1147}; 1148static const TIFFFieldInfo fax3FieldInfo[] = { 1149 { TIFFTAG_GROUP3OPTIONS, 1, 1, TIFF_LONG, FIELD_OPTIONS, 1150 FALSE, FALSE, "Group3Options" }, 1151}; 1152static const TIFFFieldInfo fax4FieldInfo[] = { 1153 { TIFFTAG_GROUP4OPTIONS, 1, 1, TIFF_LONG, FIELD_OPTIONS, 1154 FALSE, FALSE, "Group4Options" }, 1155}; 1156#define N(a) (sizeof (a) / sizeof (a[0])) 1157 1158static int 1159Fax3VSetField(TIFF* tif, ttag_t tag, va_list ap) 1160{ 1161 Fax3BaseState* sp = Fax3State(tif); 1162 const TIFFFieldInfo* fip; 1163 1164 assert(sp != 0); 1165 assert(sp->vsetparent != 0); 1166 1167 switch (tag) { 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); 1178 break; 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); 1183 break; 1184 case TIFFTAG_BADFAXLINES: 1185 sp->badfaxlines = va_arg(ap, uint32); 1186 break; 1187 case TIFFTAG_CLEANFAXDATA: 1188 sp->cleanfaxdata = (uint16) va_arg(ap, int); 1189 break; 1190 case TIFFTAG_CONSECUTIVEBADFAXLINES: 1191 sp->badfaxrun = va_arg(ap, uint32); 1192 break; 1193 case TIFFTAG_FAXRECVPARAMS: 1194 sp->recvparams = va_arg(ap, uint32); 1195 break; 1196 case TIFFTAG_FAXSUBADDRESS: 1197 _TIFFsetString(&sp->subaddress, va_arg(ap, char*)); 1198 break; 1199 case TIFFTAG_FAXRECVTIME: 1200 sp->recvtime = va_arg(ap, uint32); 1201 break; 1202 case TIFFTAG_FAXDCS: 1203 _TIFFsetString(&sp->faxdcs, va_arg(ap, char*)); 1204 break; 1205 default: 1206 return (*sp->vsetparent)(tif, tag, ap); 1207 } 1208 1209 if ((fip = _TIFFFieldWithTag(tif, tag))) 1210 TIFFSetFieldBit(tif, fip->field_bit); 1211 else 1212 return 0; 1213 1214 tif->tif_flags |= TIFF_DIRTYDIRECT; 1215 return 1; 1216} 1217 1218static int 1219Fax3VGetField(TIFF* tif, ttag_t tag, va_list ap) 1220{ 1221 Fax3BaseState* sp = Fax3State(tif); 1222 1223 assert(sp != 0); 1224 1225 switch (tag) { 1226 case TIFFTAG_FAXMODE: 1227 *va_arg(ap, int*) = sp->mode; 1228 break; 1229 case TIFFTAG_FAXFILLFUNC: 1230 *va_arg(ap, TIFFFaxFillFunc*) = DecoderState(tif)->fill; 1231 break; 1232 case TIFFTAG_GROUP3OPTIONS: 1233 case TIFFTAG_GROUP4OPTIONS: 1234 *va_arg(ap, uint32*) = sp->groupoptions; 1235 break; 1236 case TIFFTAG_BADFAXLINES: 1237 *va_arg(ap, uint32*) = sp->badfaxlines; 1238 break; 1239 case TIFFTAG_CLEANFAXDATA: 1240 *va_arg(ap, uint16*) = sp->cleanfaxdata; 1241 break; 1242 case TIFFTAG_CONSECUTIVEBADFAXLINES: 1243 *va_arg(ap, uint32*) = sp->badfaxrun; 1244 break; 1245 case TIFFTAG_FAXRECVPARAMS: 1246 *va_arg(ap, uint32*) = sp->recvparams; 1247 break; 1248 case TIFFTAG_FAXSUBADDRESS: 1249 *va_arg(ap, char**) = sp->subaddress; 1250 break; 1251 case TIFFTAG_FAXRECVTIME: 1252 *va_arg(ap, uint32*) = sp->recvtime; 1253 break; 1254 case TIFFTAG_FAXDCS: 1255 *va_arg(ap, char**) = sp->faxdcs; 1256 break; 1257 default: 1258 return (*sp->vgetparent)(tif, tag, ap); 1259 } 1260 return (1); 1261} 1262 1263static void 1264Fax3PrintDir(TIFF* tif, FILE* fd, long flags) 1265{ 1266 Fax3BaseState* sp = Fax3State(tif); 1267 1268 assert(sp != 0); 1269 1270 (void) flags; 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); 1277 } else { 1278 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); 1286 } 1287 fprintf(fd, " (%lu = 0x%lx)\n", 1288 (unsigned long) sp->groupoptions, 1289 (unsigned long) sp->groupoptions); 1290 } 1291 if (TIFFFieldSet(tif,FIELD_CLEANFAXDATA)) { 1292 fprintf(fd, " Fax Data:"); 1293 switch (sp->cleanfaxdata) { 1294 case CLEANFAXDATA_CLEAN: 1295 fprintf(fd, " clean"); 1296 break; 1297 case CLEANFAXDATA_REGENERATED: 1298 fprintf(fd, " receiver regenerated"); 1299 break; 1300 case CLEANFAXDATA_UNCLEAN: 1301 fprintf(fd, " uncorrected errors"); 1302 break; 1303 } 1304 fprintf(fd, " (%u = 0x%x)\n", 1305 sp->cleanfaxdata, sp->cleanfaxdata); 1306 } 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); 1323} 1324 1325static int 1326InitCCITTFax3(TIFF* tif) 1327{ 1328 Fax3BaseState* sp; 1329 1330 /* 1331 * Merge codec-specific tag information. 1332 */ 1333 if (!_TIFFMergeFieldInfo(tif, faxFieldInfo, N(faxFieldInfo))) { 1334 TIFFErrorExt(tif->tif_clientdata, "InitCCITTFax3", 1335 "Merging common CCITT Fax codec-specific tags failed"); 1336 return 0; 1337 } 1338 1339 /* 1340 * Allocate state block so tag methods have storage to record values. 1341 */ 1342 tif->tif_data = (tidata_t) 1343 _TIFFmalloc(sizeof (Fax3CodecState)); 1344 1345 if (tif->tif_data == NULL) { 1346 TIFFErrorExt(tif->tif_clientdata, "TIFFInitCCITTFax3", 1347 "%s: No space for state block", tif->tif_name); 1348 return (0); 1349 } 1350 1351 sp = Fax3State(tif); 1352 sp->rw_mode = tif->tif_mode; 1353 1354 /* 1355 * Override parent get/set field methods. 1356 */ 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; 1364 sp->recvparams = 0; 1365 sp->subaddress = NULL; 1366 sp->faxdcs = NULL; 1367 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; 1373 1374 /* 1375 * Install codec methods. 1376 */ 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; 1390 1391 return (1); 1392} 1393 1394int 1395TIFFInitCCITTFax3(TIFF* tif, int scheme) 1396{ 1397 (void) scheme; 1398 if (InitCCITTFax3(tif)) { 1399 /* 1400 * Merge codec-specific tag information. 1401 */ 1402 if (!_TIFFMergeFieldInfo(tif, fax3FieldInfo, N(fax3FieldInfo))) { 1403 TIFFErrorExt(tif->tif_clientdata, "TIFFInitCCITTFax3", 1404 "Merging CCITT Fax 3 codec-specific tags failed"); 1405 return 0; 1406 } 1407 1408 /* 1409 * The default format is Class/F-style w/o RTC. 1410 */ 1411 return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_CLASSF); 1412 } else 1413 return 01; 1414} 1415 1416/* 1417 * CCITT Group 4 (T.6) Facsimile-compatible 1418 * Compression Scheme Support. 1419 */ 1420 1421#define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; } 1422/* 1423 * Decode the requested amount of G4-encoded data. 1424 */ 1425static int 1426Fax4Decode(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s) 1427{ 1428 DECLARE_STATE_2D(tif, sp, "Fax4Decode"); 1429 1430 (void) s; 1431 CACHE_STATE(tif, sp); 1432 while ((long)occ > 0) { 1433 a0 = 0; 1434 RunLength = 0; 1435 pa = thisrun = sp->curruns; 1436 pb = sp->refruns; 1437 b1 = *pb++; 1438#ifdef FAX3_DEBUG 1439 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail); 1440 printf("-------------------- %d\n", tif->tif_row); 1441 fflush(stdout); 1442#endif 1443 EXPAND2D(EOFG4); 1444 if (EOLcnt) 1445 goto EOFG4; 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; 1451 sp->line++; 1452 continue; 1453 EOFG4: 1454 NeedBits16( 13, BADG4 ); 1455 BADG4: 1456#ifdef FAX3_DEBUG 1457 if( GetBits(13) != 0x1001 ) 1458 fputs( "Bad EOFB\n", stderr ); 1459#endif 1460 ClrBits( 13 ); 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 */ 1464 } 1465 UNCACHE_STATE(tif, sp); 1466 return (1); 1467} 1468#undef SWAP 1469 1470/* 1471 * Encode the requested amount of data. 1472 */ 1473static int 1474Fax4Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s) 1475{ 1476 Fax3CodecState *sp = EncoderState(tif); 1477 1478 (void) s; 1479 while ((long)cc > 0) { 1480 if (!Fax3Encode2DRow(tif, bp, sp->refline, sp->b.rowpixels)) 1481 return (0); 1482 _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes); 1483 bp += sp->b.rowbytes; 1484 cc -= sp->b.rowbytes; 1485 } 1486 return (1); 1487} 1488 1489static int 1490Fax4PostEncode(TIFF* tif) 1491{ 1492 Fax3CodecState *sp = EncoderState(tif); 1493 1494 /* terminate strip w/ EOFB */ 1495 Fax3PutBits(tif, EOL, 12); 1496 Fax3PutBits(tif, EOL, 12); 1497 if (sp->bit != 8) 1498 Fax3FlushBits(tif, sp); 1499 return (1); 1500} 1501 1502int 1503TIFFInitCCITTFax4(TIFF* tif, int scheme) 1504{ 1505 (void) scheme; 1506 if (InitCCITTFax3(tif)) { /* reuse G3 support */ 1507 /* 1508 * Merge codec-specific tag information. 1509 */ 1510 if (!_TIFFMergeFieldInfo(tif, fax4FieldInfo, N(fax4FieldInfo))) { 1511 TIFFErrorExt(tif->tif_clientdata, "TIFFInitCCITTFax4", 1512 "Merging CCITT Fax 4 codec-specific tags failed"); 1513 return 0; 1514 } 1515 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; 1523 /* 1524 * Suppress RTC at the end of each strip. 1525 */ 1526 return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_NORTC); 1527 } else 1528 return (0); 1529} 1530 1531/* 1532 * CCITT Group 3 1-D Modified Huffman RLE Compression Support. 1533 * (Compression algorithms 2 and 32771) 1534 */ 1535 1536/* 1537 * Decode the requested amount of RLE-encoded data. 1538 */ 1539static int 1540Fax3DecodeRLE(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s) 1541{ 1542 DECLARE_STATE(tif, sp, "Fax3DecodeRLE"); 1543 int mode = sp->b.mode; 1544 1545 (void) s; 1546 CACHE_STATE(tif, sp); 1547 thisrun = sp->curruns; 1548 while ((long)occ > 0) { 1549 a0 = 0; 1550 RunLength = 0; 1551 pa = thisrun; 1552#ifdef FAX3_DEBUG 1553 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail); 1554 printf("-------------------- %d\n", tif->tif_row); 1555 fflush(stdout); 1556#endif 1557 EXPAND1D(EOFRLE); 1558 (*sp->fill)(buf, thisrun, pa, lastx); 1559 /* 1560 * Cleanup at the end of the row. 1561 */ 1562 if (mode & FAXMODE_BYTEALIGN) { 1563 int n = BitsAvail - (BitsAvail &~ 7); 1564 ClrBits(n); 1565 } else if (mode & FAXMODE_WORDALIGN) { 1566 int n = BitsAvail - (BitsAvail &~ 15); 1567 ClrBits(n); 1568 if (BitsAvail == 0 && !isAligned(cp, uint16)) 1569 cp++; 1570 } 1571 buf += sp->b.rowbytes; 1572 occ -= sp->b.rowbytes; 1573 sp->line++; 1574 continue; 1575 EOFRLE: /* premature EOF */ 1576 (*sp->fill)(buf, thisrun, pa, lastx); 1577 UNCACHE_STATE(tif, sp); 1578 return (-1); 1579 } 1580 UNCACHE_STATE(tif, sp); 1581 return (1); 1582} 1583 1584int 1585TIFFInitCCITTRLE(TIFF* tif, int scheme) 1586{ 1587 (void) scheme; 1588 if (InitCCITTFax3(tif)) { /* reuse G3 support */ 1589 tif->tif_decoderow = Fax3DecodeRLE; 1590 tif->tif_decodestrip = Fax3DecodeRLE; 1591 tif->tif_decodetile = Fax3DecodeRLE; 1592 /* 1593 * Suppress RTC+EOLs when encoding and byte-align data. 1594 */ 1595 return TIFFSetField(tif, TIFFTAG_FAXMODE, 1596 FAXMODE_NORTC|FAXMODE_NOEOL|FAXMODE_BYTEALIGN); 1597 } else 1598 return (0); 1599} 1600 1601int 1602TIFFInitCCITTRLEW(TIFF* tif, int scheme) 1603{ 1604 (void) scheme; 1605 if (InitCCITTFax3(tif)) { /* reuse G3 support */ 1606 tif->tif_decoderow = Fax3DecodeRLE; 1607 tif->tif_decodestrip = Fax3DecodeRLE; 1608 tif->tif_decodetile = Fax3DecodeRLE; 1609 /* 1610 * Suppress RTC+EOLs when encoding and word-align data. 1611 */ 1612 return TIFFSetField(tif, TIFFTAG_FAXMODE, 1613 FAXMODE_NORTC|FAXMODE_NOEOL|FAXMODE_WORDALIGN); 1614 } else 1615 return (0); 1616} 1617#endif /* CCITT_SUPPORT */ 1618 1619/* vim: set ts=8 sts=8 sw=8 noet: */ 1620/* 1621 * Local Variables: 1622 * mode: c 1623 * c-basic-offset: 8 1624 * fill-column: 78 1625 * End: 1626 */