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| 1 /* $Id: tif_fax3.c,v 1.74 2012-06-21 02:01:31 fwarmerdam 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 #include "tiffiop.h" | |
| 27 #ifdef CCITT_SUPPORT | |
| 28 /* | |
| 29 * TIFF Library. | |
| 30 * | |
| 31 * CCITT Group 3 (T.4) and Group 4 (T.6) Compression Support. | |
| 32 * | |
| 33 * This file contains support for decoding and encoding TIFF | |
| 34 * compression algorithms 2, 3, 4, and 32771. | |
| 35 * | |
| 36 * Decoder support is derived, with permission, from the code | |
| 37 * in Frank Cringle's viewfax program; | |
| 38 * Copyright (C) 1990, 1995 Frank D. Cringle. | |
| 39 */ | |
| 40 #include "tif_fax3.h" | |
| 41 #define G3CODES | |
| 42 #include "t4.h" | |
| 43 #include <stdio.h> | |
| 44 | |
| 45 /* | |
| 46 * Compression+decompression state blocks are | |
| 47 * derived from this ``base state'' block. | |
| 48 */ | |
| 49 typedef struct { | |
| 50 int rw_mode; /* O_RDONLY for decode, else encode */ | |
| 51 int mode; /* operating mode */ | |
| 52 tmsize_t rowbytes; /* bytes in a decoded scanline */ | |
| 53 uint32 rowpixels; /* pixels in a scanline */ | |
| 54 | |
| 55 uint16 cleanfaxdata; /* CleanFaxData tag */ | |
| 56 uint32 badfaxrun; /* BadFaxRun tag */ | |
| 57 uint32 badfaxlines; /* BadFaxLines tag */ | |
| 58 uint32 groupoptions; /* Group 3/4 options tag */ | |
| 59 | |
| 60 TIFFVGetMethod vgetparent; /* super-class method */ | |
| 61 TIFFVSetMethod vsetparent; /* super-class method */ | |
| 62 TIFFPrintMethod printdir; /* super-class method */ | |
| 63 } Fax3BaseState; | |
| 64 #define Fax3State(tif) ((Fax3BaseState*) (tif)->tif_data) | |
| 65 | |
| 66 typedef enum { G3_1D, G3_2D } Ttag; | |
| 67 typedef struct { | |
| 68 Fax3BaseState b; | |
| 69 | |
| 70 /* Decoder state info */ | |
| 71 const unsigned char* bitmap; /* bit reversal table */ | |
| 72 uint32 data; /* current i/o byte/word */ | |
| 73 int bit; /* current i/o bit in byte */ | |
| 74 int EOLcnt; /* count of EOL codes recognized */ | |
| 75 TIFFFaxFillFunc fill; /* fill routine */ | |
| 76 uint32* runs; /* b&w runs for current/previous row */ | |
| 77 uint32* refruns; /* runs for reference line */ | |
| 78 uint32* curruns; /* runs for current line */ | |
| 79 | |
| 80 /* Encoder state info */ | |
| 81 Ttag tag; /* encoding state */ | |
| 82 unsigned char* refline; /* reference line for 2d decoding */ | |
| 83 int k; /* #rows left that can be 2d encoded */ | |
| 84 int maxk; /* max #rows that can be 2d encoded */ | |
| 85 | |
| 86 int line; | |
| 87 } Fax3CodecState; | |
| 88 #define DecoderState(tif) ((Fax3CodecState*) Fax3State(tif)) | |
| 89 #define EncoderState(tif) ((Fax3CodecState*) Fax3State(tif)) | |
| 90 | |
| 91 #define is2DEncoding(sp) (sp->b.groupoptions & GROUP3OPT_2DENCODING) | |
| 92 #define isAligned(p,t) ((((size_t)(p)) & (sizeof (t)-1)) == 0) | |
| 93 | |
| 94 /* | |
| 95 * Group 3 and Group 4 Decoding. | |
| 96 */ | |
| 97 | |
| 98 /* | |
| 99 * These macros glue the TIFF library state to | |
| 100 * the state expected by Frank's decoder. | |
| 101 */ | |
| 102 #define DECLARE_STATE(tif, sp, mod) \ | |
| 103 static const char module[] = mod; \ | |
| 104 Fax3CodecState* sp = DecoderState(tif); \ | |
| 105 int a0; /* reference element */ \ | |
| 106 int lastx = sp->b.rowpixels; /* last element in row */ \ | |
| 107 uint32 BitAcc; /* bit accumulator */ \ | |
| 108 int BitsAvail; /* # valid bits in BitAcc */ \ | |
| 109 int RunLength; /* length of current run */ \ | |
| 110 unsigned char* cp; /* next byte of input data */ \ | |
| 111 unsigned char* ep; /* end of input data */ \ | |
| 112 uint32* pa; /* place to stuff next run */ \ | |
| 113 uint32* thisrun; /* current row's run array */ \ | |
| 114 int EOLcnt; /* # EOL codes recognized */ \ | |
| 115 const unsigned char* bitmap = sp->bitmap; /* input data bit reverser */
\ | |
| 116 const TIFFFaxTabEnt* TabEnt | |
| 117 #define DECLARE_STATE_2D(tif, sp, mod) \ | |
| 118 DECLARE_STATE(tif, sp, mod); \ | |
| 119 int b1; /* next change on prev line */ \ | |
| 120 uint32* pb /* next run in reference line */\ | |
| 121 /* | |
| 122 * Load any state that may be changed during decoding. | |
| 123 */ | |
| 124 #define CACHE_STATE(tif, sp) do { \ | |
| 125 BitAcc = sp->data; \ | |
| 126 BitsAvail = sp->bit; \ | |
| 127 EOLcnt = sp->EOLcnt; \ | |
| 128 cp = (unsigned char*) tif->tif_rawcp; \ | |
| 129 ep = cp + tif->tif_rawcc; \ | |
| 130 } while (0) | |
| 131 /* | |
| 132 * Save state possibly changed during decoding. | |
| 133 */ | |
| 134 #define UNCACHE_STATE(tif, sp) do { \ | |
| 135 sp->bit = BitsAvail; \ | |
| 136 sp->data = BitAcc; \ | |
| 137 sp->EOLcnt = EOLcnt; \ | |
| 138 tif->tif_rawcc -= (tmsize_t)((uint8*) cp - tif->tif_rawcp); \ | |
| 139 tif->tif_rawcp = (uint8*) cp; \ | |
| 140 } while (0) | |
| 141 | |
| 142 /* | |
| 143 * Setup state for decoding a strip. | |
| 144 */ | |
| 145 static int | |
| 146 Fax3PreDecode(TIFF* tif, uint16 s) | |
| 147 { | |
| 148 Fax3CodecState* sp = DecoderState(tif); | |
| 149 | |
| 150 (void) s; | |
| 151 assert(sp != NULL); | |
| 152 sp->bit = 0; /* force initial read */ | |
| 153 sp->data = 0; | |
| 154 sp->EOLcnt = 0; /* force initial scan for EOL */ | |
| 155 /* | |
| 156 * Decoder assumes lsb-to-msb bit order. Note that we select | |
| 157 * this here rather than in Fax3SetupState so that viewers can | |
| 158 * hold the image open, fiddle with the FillOrder tag value, | |
| 159 * and then re-decode the image. Otherwise they'd need to close | |
| 160 * and open the image to get the state reset. | |
| 161 */ | |
| 162 sp->bitmap = | |
| 163 TIFFGetBitRevTable(tif->tif_dir.td_fillorder != FILLORDER_LSB2MSB); | |
| 164 if (sp->refruns) { /* init reference line to white */ | |
| 165 sp->refruns[0] = (uint32) sp->b.rowpixels; | |
| 166 sp->refruns[1] = 0; | |
| 167 } | |
| 168 sp->line = 0; | |
| 169 return (1); | |
| 170 } | |
| 171 | |
| 172 /* | |
| 173 * Routine for handling various errors/conditions. | |
| 174 * Note how they are "glued into the decoder" by | |
| 175 * overriding the definitions used by the decoder. | |
| 176 */ | |
| 177 | |
| 178 static void | |
| 179 Fax3Unexpected(const char* module, TIFF* tif, uint32 line, uint32 a0) | |
| 180 { | |
| 181 TIFFErrorExt(tif->tif_clientdata, module, "Bad code word at line %u of %
s %u (x %u)", | |
| 182 line, isTiled(tif) ? "tile" : "strip", | |
| 183 (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), | |
| 184 a0); | |
| 185 } | |
| 186 #define unexpected(table, a0) Fax3Unexpected(module, tif, sp->line, a0) | |
| 187 | |
| 188 static void | |
| 189 Fax3Extension(const char* module, TIFF* tif, uint32 line, uint32 a0) | |
| 190 { | |
| 191 TIFFErrorExt(tif->tif_clientdata, module, | |
| 192 "Uncompressed data (not supported) at line %u of %s %u (x %u)", | |
| 193 line, isTiled(tif) ? "tile" : "strip", | |
| 194 (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), | |
| 195 a0); | |
| 196 } | |
| 197 #define extension(a0) Fax3Extension(module, tif, sp->line, a0) | |
| 198 | |
| 199 static void | |
| 200 Fax3BadLength(const char* module, TIFF* tif, uint32 line, uint32 a0, uint32 last
x) | |
| 201 { | |
| 202 TIFFWarningExt(tif->tif_clientdata, module, "%s at line %u of %s %u (got
%u, expected %u)", | |
| 203 a0 < lastx ? "Premature EOL" : "Line length mismatch", | |
| 204 line, isTiled(tif) ? "tile" : "strip", | |
| 205 (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), | |
| 206 a0, lastx); | |
| 207 } | |
| 208 #define badlength(a0,lastx) Fax3BadLength(module, tif, sp->line, a0, lastx) | |
| 209 | |
| 210 static void | |
| 211 Fax3PrematureEOF(const char* module, TIFF* tif, uint32 line, uint32 a0) | |
| 212 { | |
| 213 TIFFWarningExt(tif->tif_clientdata, module, "Premature EOF at line %u of
%s %u (x %u)", | |
| 214 line, isTiled(tif) ? "tile" : "strip", | |
| 215 (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), | |
| 216 a0); | |
| 217 } | |
| 218 #define prematureEOF(a0) Fax3PrematureEOF(module, tif, sp->line, a0) | |
| 219 | |
| 220 #define Nop | |
| 221 | |
| 222 /* | |
| 223 * Decode the requested amount of G3 1D-encoded data. | |
| 224 */ | |
| 225 static int | |
| 226 Fax3Decode1D(TIFF* tif, uint8* buf, tmsize_t occ, uint16 s) | |
| 227 { | |
| 228 DECLARE_STATE(tif, sp, "Fax3Decode1D"); | |
| 229 (void) s; | |
| 230 if (occ % sp->b.rowbytes) | |
| 231 { | |
| 232 TIFFErrorExt(tif->tif_clientdata, module, "Fractional scanlines
cannot be read"); | |
| 233 return (-1); | |
| 234 } | |
| 235 CACHE_STATE(tif, sp); | |
| 236 thisrun = sp->curruns; | |
| 237 while (occ > 0) { | |
| 238 a0 = 0; | |
| 239 RunLength = 0; | |
| 240 pa = thisrun; | |
| 241 #ifdef FAX3_DEBUG | |
| 242 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail); | |
| 243 printf("-------------------- %d\n", tif->tif_row); | |
| 244 fflush(stdout); | |
| 245 #endif | |
| 246 SYNC_EOL(EOF1D); | |
| 247 EXPAND1D(EOF1Da); | |
| 248 (*sp->fill)(buf, thisrun, pa, lastx); | |
| 249 buf += sp->b.rowbytes; | |
| 250 occ -= sp->b.rowbytes; | |
| 251 sp->line++; | |
| 252 continue; | |
| 253 EOF1D: /* premature EOF */ | |
| 254 CLEANUP_RUNS(); | |
| 255 EOF1Da: /* premature EOF */ | |
| 256 (*sp->fill)(buf, thisrun, pa, lastx); | |
| 257 UNCACHE_STATE(tif, sp); | |
| 258 return (-1); | |
| 259 } | |
| 260 UNCACHE_STATE(tif, sp); | |
| 261 return (1); | |
| 262 } | |
| 263 | |
| 264 #define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; } | |
| 265 /* | |
| 266 * Decode the requested amount of G3 2D-encoded data. | |
| 267 */ | |
| 268 static int | |
| 269 Fax3Decode2D(TIFF* tif, uint8* buf, tmsize_t occ, uint16 s) | |
| 270 { | |
| 271 DECLARE_STATE_2D(tif, sp, "Fax3Decode2D"); | |
| 272 int is1D; /* current line is 1d/2d-encoded */ | |
| 273 (void) s; | |
| 274 if (occ % sp->b.rowbytes) | |
| 275 { | |
| 276 TIFFErrorExt(tif->tif_clientdata, module, "Fractional scanlines
cannot be read"); | |
| 277 return (-1); | |
| 278 } | |
| 279 CACHE_STATE(tif, sp); | |
| 280 while (occ > 0) { | |
| 281 a0 = 0; | |
| 282 RunLength = 0; | |
| 283 pa = thisrun = sp->curruns; | |
| 284 #ifdef FAX3_DEBUG | |
| 285 printf("\nBitAcc=%08X, BitsAvail = %d EOLcnt = %d", | |
| 286 BitAcc, BitsAvail, EOLcnt); | |
| 287 #endif | |
| 288 SYNC_EOL(EOF2D); | |
| 289 NeedBits8(1, EOF2D); | |
| 290 is1D = GetBits(1); /* 1D/2D-encoding tag bit */ | |
| 291 ClrBits(1); | |
| 292 #ifdef FAX3_DEBUG | |
| 293 printf(" %s\n-------------------- %d\n", | |
| 294 is1D ? "1D" : "2D", tif->tif_row); | |
| 295 fflush(stdout); | |
| 296 #endif | |
| 297 pb = sp->refruns; | |
| 298 b1 = *pb++; | |
| 299 if (is1D) | |
| 300 EXPAND1D(EOF2Da); | |
| 301 else | |
| 302 EXPAND2D(EOF2Da); | |
| 303 (*sp->fill)(buf, thisrun, pa, lastx); | |
| 304 SETVALUE(0); /* imaginary change for reference */ | |
| 305 SWAP(uint32*, sp->curruns, sp->refruns); | |
| 306 buf += sp->b.rowbytes; | |
| 307 occ -= sp->b.rowbytes; | |
| 308 sp->line++; | |
| 309 continue; | |
| 310 EOF2D: /* premature EOF */ | |
| 311 CLEANUP_RUNS(); | |
| 312 EOF2Da: /* premature EOF */ | |
| 313 (*sp->fill)(buf, thisrun, pa, lastx); | |
| 314 UNCACHE_STATE(tif, sp); | |
| 315 return (-1); | |
| 316 } | |
| 317 UNCACHE_STATE(tif, sp); | |
| 318 return (1); | |
| 319 } | |
| 320 #undef SWAP | |
| 321 | |
| 322 /* | |
| 323 * The ZERO & FILL macros must handle spans < 2*sizeof(long) bytes. | |
| 324 * For machines with 64-bit longs this is <16 bytes; otherwise | |
| 325 * this is <8 bytes. We optimize the code here to reflect the | |
| 326 * machine characteristics. | |
| 327 */ | |
| 328 #if SIZEOF_UNSIGNED_LONG == 8 | |
| 329 # define FILL(n, cp) \ | |
| 330 switch (n) { \ | |
| 331 case 15:(cp)[14] = 0xff; case 14:(cp)[13] = 0xff; case 13: (cp)[12] = 0xff;\ | |
| 332 case 12:(cp)[11] = 0xff; case 11:(cp)[10] = 0xff; case 10: (cp)[9] = 0xff;\ | |
| 333 case 9: (cp)[8] = 0xff; case 8: (cp)[7] = 0xff; case 7: (cp)[6] = 0xff;\ | |
| 334 case 6: (cp)[5] = 0xff; case 5: (cp)[4] = 0xff; case 4: (cp)[3] = 0xff;\ | |
| 335 case 3: (cp)[2] = 0xff; case 2: (cp)[1] = 0xff; \ | |
| 336 case 1: (cp)[0] = 0xff; (cp) += (n); case 0: ; \ | |
| 337 } | |
| 338 # define ZERO(n, cp) \ | |
| 339 switch (n) { \ | |
| 340 case 15:(cp)[14] = 0; case 14:(cp)[13] = 0; case 13: (cp)[12] = 0; \ | |
| 341 case 12:(cp)[11] = 0; case 11:(cp)[10] = 0; case 10: (cp)[9] = 0; \ | |
| 342 case 9: (cp)[8] = 0; case 8: (cp)[7] = 0; case 7: (cp)[6] = 0; \ | |
| 343 case 6: (cp)[5] = 0; case 5: (cp)[4] = 0; case 4: (cp)[3] = 0; \ | |
| 344 case 3: (cp)[2] = 0; case 2: (cp)[1] = 0; \ | |
| 345 case 1: (cp)[0] = 0; (cp) += (n); case 0: ; \ | |
| 346 } | |
| 347 #else | |
| 348 # define FILL(n, cp) \ | |
| 349 switch (n) { \ | |
| 350 case 7: (cp)[6] = 0xff; case 6: (cp)[5] = 0xff; case 5: (cp)[4] = 0xff; \ | |
| 351 case 4: (cp)[3] = 0xff; case 3: (cp)[2] = 0xff; case 2: (cp)[1] = 0xff; \ | |
| 352 case 1: (cp)[0] = 0xff; (cp) += (n); case 0: ; \ | |
| 353 } | |
| 354 # define ZERO(n, cp) \ | |
| 355 switch (n) { \ | |
| 356 case 7: (cp)[6] = 0; case 6: (cp)[5] = 0; case 5: (cp)[4] = 0; \ | |
| 357 case 4: (cp)[3] = 0; case 3: (cp)[2] = 0; case 2: (cp)[1] = 0; \ | |
| 358 case 1: (cp)[0] = 0; (cp) += (n); case 0: ; \ | |
| 359 } | |
| 360 #endif | |
| 361 | |
| 362 /* | |
| 363 * Bit-fill a row according to the white/black | |
| 364 * runs generated during G3/G4 decoding. | |
| 365 */ | |
| 366 void | |
| 367 _TIFFFax3fillruns(unsigned char* buf, uint32* runs, uint32* erun, uint32 lastx) | |
| 368 { | |
| 369 static const unsigned char _fillmasks[] = | |
| 370 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff }; | |
| 371 unsigned char* cp; | |
| 372 uint32 x, bx, run,bx_;/* add bx_ = 8-bx for avoid ms evc compiler bug*/ | |
| 373 int32 n, nw; | |
| 374 long* lp; | |
| 375 | |
| 376 if ((erun-runs)&1) | |
| 377 *erun++ = 0; | |
| 378 x = 0; | |
| 379 for (; runs < erun; runs += 2) { | |
| 380 run = runs[0]; | |
| 381 if (x+run > lastx || run > lastx ) | |
| 382 run = runs[0] = (uint32) (lastx - x); | |
| 383 if (run) { | |
| 384 cp = buf + (x>>3); | |
| 385 bx = x&7; | |
| 386 // if (run > 8-bx) { | |
| 387 // if (bx) { /* align to byte boundar
y */ | |
| 388 // *cp++ &= 0xff << (8-bx); | |
| 389 // run -= 8-bx; | |
| 390 // } | |
| 391 //Modify by Sunliang.Liu 20090804 | |
| 392 //Detail: For avoid ms evc compiler bug in WCE ARMV4(I) Release | |
| 393 bx_ = 8-bx; | |
| 394 if (run > bx_) { | |
| 395 if (bx) { /* align to byte boundary */ | |
| 396 *cp++ &= 0xff << bx_; | |
| 397 run -= bx_; | |
| 398 } | |
| 399 if( (n = run >> 3) != 0 ) { /* multiple bytes to fill */ | |
| 400 if ((n/sizeof (long)) > 1) { | |
| 401 /* | |
| 402 * Align to longword boundary and fill. | |
| 403 */ | |
| 404 for (; n && !isAligned(cp, long); n--) | |
| 405 *cp++ = 0x00; | |
| 406 lp = (long*) cp; | |
| 407 nw = (int32)(n / sizeof (long)); | |
| 408 n -= nw * sizeof (long); | |
| 409 do { | |
| 410 *lp++ = 0L; | |
| 411 } while (--nw); | |
| 412 cp = (unsigned char*) lp; | |
| 413 } | |
| 414 #ifdef FAX3_DEBUG | |
| 415 printf("_TIFFFax3fillruns ZERO: %d\n",n); | |
| 416 #endif | |
| 417 ZERO(n, cp); | |
| 418 run &= 7; | |
| 419 } | |
| 420 if (run) | |
| 421 cp[0] &= 0xff >> run; | |
| 422 } else | |
| 423 cp[0] &= ~(_fillmasks[run]>>bx); | |
| 424 x += runs[0]; | |
| 425 } | |
| 426 run = runs[1]; | |
| 427 if (x+run > lastx || run > lastx ) | |
| 428 run = runs[1] = lastx - x; | |
| 429 if (run) { | |
| 430 cp = buf + (x>>3); | |
| 431 bx = x&7; | |
| 432 if (run > 8-bx) { | |
| 433 if (bx) { /* align to byte boundary */ | |
| 434 *cp++ |= 0xff >> bx; | |
| 435 run -= 8-bx; | |
| 436 } | |
| 437 if( (n = run>>3) != 0 ) { /* multiple bytes to fill */ | |
| 438 if ((n/sizeof (long)) > 1) { | |
| 439 /* | |
| 440 * Align to longword boundary and fill. | |
| 441 */ | |
| 442 for (; n && !isAligned(cp, long); n--) | |
| 443 *cp++ = 0xff; | |
| 444 lp = (long*) cp; | |
| 445 nw = (int32)(n / sizeof (long)); | |
| 446 n -= nw * sizeof (long); | |
| 447 do { | |
| 448 *lp++ = -1L; | |
| 449 } while (--nw); | |
| 450 cp = (unsigned char*) lp; | |
| 451 } | |
| 452 #ifdef FAX3_DEBUG | |
| 453 printf("_TIFFFax3fillruns FILL: %d\n",n); | |
| 454 #endif | |
| 455 FILL(n, cp); | |
| 456 run &= 7; | |
| 457 } | |
| 458 if (run) | |
| 459 cp[0] |= 0xff00 >> run; | |
| 460 } else | |
| 461 cp[0] |= _fillmasks[run]>>bx; | |
| 462 x += runs[1]; | |
| 463 } | |
| 464 } | |
| 465 assert(x == lastx); | |
| 466 } | |
| 467 #undef ZERO | |
| 468 #undef FILL | |
| 469 | |
| 470 static int | |
| 471 Fax3FixupTags(TIFF* tif) | |
| 472 { | |
| 473 (void) tif; | |
| 474 return (1); | |
| 475 } | |
| 476 | |
| 477 /* | |
| 478 * Setup G3/G4-related compression/decompression state | |
| 479 * before data is processed. This routine is called once | |
| 480 * per image -- it sets up different state based on whether | |
| 481 * or not decoding or encoding is being done and whether | |
| 482 * 1D- or 2D-encoded data is involved. | |
| 483 */ | |
| 484 static int | |
| 485 Fax3SetupState(TIFF* tif) | |
| 486 { | |
| 487 static const char module[] = "Fax3SetupState"; | |
| 488 TIFFDirectory* td = &tif->tif_dir; | |
| 489 Fax3BaseState* sp = Fax3State(tif); | |
| 490 int needsRefLine; | |
| 491 Fax3CodecState* dsp = (Fax3CodecState*) Fax3State(tif); | |
| 492 tmsize_t rowbytes; | |
| 493 uint32 rowpixels, nruns; | |
| 494 | |
| 495 if (td->td_bitspersample != 1) { | |
| 496 TIFFErrorExt(tif->tif_clientdata, module, | |
| 497 "Bits/sample must be 1 for Group 3/4 encoding/decoding"); | |
| 498 return (0); | |
| 499 } | |
| 500 /* | |
| 501 * Calculate the scanline/tile widths. | |
| 502 */ | |
| 503 if (isTiled(tif)) { | |
| 504 rowbytes = TIFFTileRowSize(tif); | |
| 505 rowpixels = td->td_tilewidth; | |
| 506 } else { | |
| 507 rowbytes = TIFFScanlineSize(tif); | |
| 508 rowpixels = td->td_imagewidth; | |
| 509 } | |
| 510 sp->rowbytes = rowbytes; | |
| 511 sp->rowpixels = rowpixels; | |
| 512 /* | |
| 513 * Allocate any additional space required for decoding/encoding. | |
| 514 */ | |
| 515 needsRefLine = ( | |
| 516 (sp->groupoptions & GROUP3OPT_2DENCODING) || | |
| 517 td->td_compression == COMPRESSION_CCITTFAX4 | |
| 518 ); | |
| 519 | |
| 520 /* | |
| 521 Assure that allocation computations do not overflow. | |
| 522 | |
| 523 TIFFroundup and TIFFSafeMultiply return zero on integer overflow | |
| 524 */ | |
| 525 dsp->runs=(uint32*) NULL; | |
| 526 nruns = TIFFroundup_32(rowpixels,32); | |
| 527 if (needsRefLine) { | |
| 528 nruns = TIFFSafeMultiply(uint32,nruns,2); | |
| 529 } | |
| 530 if ((nruns == 0) || (TIFFSafeMultiply(uint32,nruns,2) == 0)) { | |
| 531 TIFFErrorExt(tif->tif_clientdata, tif->tif_name, | |
| 532 "Row pixels integer overflow (rowpixels %u)", | |
| 533 rowpixels); | |
| 534 return (0); | |
| 535 } | |
| 536 dsp->runs = (uint32*) _TIFFCheckMalloc(tif, | |
| 537 TIFFSafeMultiply(uint32,nruns,2), | |
| 538 sizeof (uint32), | |
| 539 "for Group 3/4 run arrays"); | |
| 540 if (dsp->runs == NULL) | |
| 541 return (0); | |
| 542 memset( dsp->runs, 0, TIFFSafeMultiply(uint32,nruns,2)*sizeof(uint32)); | |
| 543 dsp->curruns = dsp->runs; | |
| 544 if (needsRefLine) | |
| 545 dsp->refruns = dsp->runs + nruns; | |
| 546 else | |
| 547 dsp->refruns = NULL; | |
| 548 if (td->td_compression == COMPRESSION_CCITTFAX3 | |
| 549 && is2DEncoding(dsp)) { /* NB: default is 1D routine */ | |
| 550 tif->tif_decoderow = Fax3Decode2D; | |
| 551 tif->tif_decodestrip = Fax3Decode2D; | |
| 552 tif->tif_decodetile = Fax3Decode2D; | |
| 553 } | |
| 554 | |
| 555 if (needsRefLine) { /* 2d encoding */ | |
| 556 Fax3CodecState* esp = EncoderState(tif); | |
| 557 /* | |
| 558 * 2d encoding requires a scanline | |
| 559 * buffer for the ``reference line''; the | |
| 560 * scanline against which delta encoding | |
| 561 * is referenced. The reference line must | |
| 562 * be initialized to be ``white'' (done elsewhere). | |
| 563 */ | |
| 564 esp->refline = (unsigned char*) _TIFFmalloc(rowbytes); | |
| 565 if (esp->refline == NULL) { | |
| 566 TIFFErrorExt(tif->tif_clientdata, module, | |
| 567 "No space for Group 3/4 reference line"); | |
| 568 return (0); | |
| 569 } | |
| 570 } else /* 1d encoding */ | |
| 571 EncoderState(tif)->refline = NULL; | |
| 572 | |
| 573 return (1); | |
| 574 } | |
| 575 | |
| 576 /* | |
| 577 * CCITT Group 3 FAX Encoding. | |
| 578 */ | |
| 579 | |
| 580 #define Fax3FlushBits(tif, sp) { \ | |
| 581 if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \ | |
| 582 (void) TIFFFlushData1(tif); \ | |
| 583 *(tif)->tif_rawcp++ = (uint8) (sp)->data; \ | |
| 584 (tif)->tif_rawcc++; \ | |
| 585 (sp)->data = 0, (sp)->bit = 8; \ | |
| 586 } | |
| 587 #define _FlushBits(tif) { \ | |
| 588 if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \ | |
| 589 (void) TIFFFlushData1(tif); \ | |
| 590 *(tif)->tif_rawcp++ = (uint8) data; \ | |
| 591 (tif)->tif_rawcc++; \ | |
| 592 data = 0, bit = 8; \ | |
| 593 } | |
| 594 static const int _msbmask[9] = | |
| 595 { 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff }; | |
| 596 #define _PutBits(tif, bits, length) { \ | |
| 597 while (length > bit) { \ | |
| 598 data |= bits >> (length - bit); \ | |
| 599 length -= bit; \ | |
| 600 _FlushBits(tif); \ | |
| 601 } \ | |
| 602 assert( length < 9 ); \ | |
| 603 data |= (bits & _msbmask[length]) << (bit - length); \ | |
| 604 bit -= length; \ | |
| 605 if (bit == 0) \ | |
| 606 _FlushBits(tif); \ | |
| 607 } | |
| 608 | |
| 609 /* | |
| 610 * Write a variable-length bit-value to | |
| 611 * the output stream. Values are | |
| 612 * assumed to be at most 16 bits. | |
| 613 */ | |
| 614 static void | |
| 615 Fax3PutBits(TIFF* tif, unsigned int bits, unsigned int length) | |
| 616 { | |
| 617 Fax3CodecState* sp = EncoderState(tif); | |
| 618 unsigned int bit = sp->bit; | |
| 619 int data = sp->data; | |
| 620 | |
| 621 _PutBits(tif, bits, length); | |
| 622 | |
| 623 sp->data = data; | |
| 624 sp->bit = bit; | |
| 625 } | |
| 626 | |
| 627 /* | |
| 628 * Write a code to the output stream. | |
| 629 */ | |
| 630 #define putcode(tif, te) Fax3PutBits(tif, (te)->code, (te)->length) | |
| 631 | |
| 632 #ifdef FAX3_DEBUG | |
| 633 #define DEBUG_COLOR(w) (tab == TIFFFaxWhiteCodes ? w "W" : w "B") | |
| 634 #define DEBUG_PRINT(what,len) { \ | |
| 635 int t; \ | |
| 636 printf("%08X/%-2d: %s%5d\t", data, bit, DEBUG_COLOR(what), len); \ | |
| 637 for (t = length-1; t >= 0; t--) \ | |
| 638 putchar(code & (1<<t) ? '1' : '0'); \ | |
| 639 putchar('\n'); \ | |
| 640 } | |
| 641 #endif | |
| 642 | |
| 643 /* | |
| 644 * Write the sequence of codes that describes | |
| 645 * the specified span of zero's or one's. The | |
| 646 * appropriate table that holds the make-up and | |
| 647 * terminating codes is supplied. | |
| 648 */ | |
| 649 static void | |
| 650 putspan(TIFF* tif, int32 span, const tableentry* tab) | |
| 651 { | |
| 652 Fax3CodecState* sp = EncoderState(tif); | |
| 653 unsigned int bit = sp->bit; | |
| 654 int data = sp->data; | |
| 655 unsigned int code, length; | |
| 656 | |
| 657 while (span >= 2624) { | |
| 658 const tableentry* te = &tab[63 + (2560>>6)]; | |
| 659 code = te->code, length = te->length; | |
| 660 #ifdef FAX3_DEBUG | |
| 661 DEBUG_PRINT("MakeUp", te->runlen); | |
| 662 #endif | |
| 663 _PutBits(tif, code, length); | |
| 664 span -= te->runlen; | |
| 665 } | |
| 666 if (span >= 64) { | |
| 667 const tableentry* te = &tab[63 + (span>>6)]; | |
| 668 assert(te->runlen == 64*(span>>6)); | |
| 669 code = te->code, length = te->length; | |
| 670 #ifdef FAX3_DEBUG | |
| 671 DEBUG_PRINT("MakeUp", te->runlen); | |
| 672 #endif | |
| 673 _PutBits(tif, code, length); | |
| 674 span -= te->runlen; | |
| 675 } | |
| 676 code = tab[span].code, length = tab[span].length; | |
| 677 #ifdef FAX3_DEBUG | |
| 678 DEBUG_PRINT(" Term", tab[span].runlen); | |
| 679 #endif | |
| 680 _PutBits(tif, code, length); | |
| 681 | |
| 682 sp->data = data; | |
| 683 sp->bit = bit; | |
| 684 } | |
| 685 | |
| 686 /* | |
| 687 * Write an EOL code to the output stream. The zero-fill | |
| 688 * logic for byte-aligning encoded scanlines is handled | |
| 689 * here. We also handle writing the tag bit for the next | |
| 690 * scanline when doing 2d encoding. | |
| 691 */ | |
| 692 static void | |
| 693 Fax3PutEOL(TIFF* tif) | |
| 694 { | |
| 695 Fax3CodecState* sp = EncoderState(tif); | |
| 696 unsigned int bit = sp->bit; | |
| 697 int data = sp->data; | |
| 698 unsigned int code, length, tparm; | |
| 699 | |
| 700 if (sp->b.groupoptions & GROUP3OPT_FILLBITS) { | |
| 701 /* | |
| 702 * Force bit alignment so EOL will terminate on | |
| 703 * a byte boundary. That is, force the bit alignment | |
| 704 * to 16-12 = 4 before putting out the EOL code. | |
| 705 */ | |
| 706 int align = 8 - 4; | |
| 707 if (align != sp->bit) { | |
| 708 if (align > sp->bit) | |
| 709 align = sp->bit + (8 - align); | |
| 710 else | |
| 711 align = sp->bit - align; | |
| 712 code = 0; | |
| 713 tparm=align; | |
| 714 _PutBits(tif, 0, tparm); | |
| 715 } | |
| 716 } | |
| 717 code = EOL, length = 12; | |
| 718 if (is2DEncoding(sp)) | |
| 719 code = (code<<1) | (sp->tag == G3_1D), length++; | |
| 720 _PutBits(tif, code, length); | |
| 721 | |
| 722 sp->data = data; | |
| 723 sp->bit = bit; | |
| 724 } | |
| 725 | |
| 726 /* | |
| 727 * Reset encoding state at the start of a strip. | |
| 728 */ | |
| 729 static int | |
| 730 Fax3PreEncode(TIFF* tif, uint16 s) | |
| 731 { | |
| 732 Fax3CodecState* sp = EncoderState(tif); | |
| 733 | |
| 734 (void) s; | |
| 735 assert(sp != NULL); | |
| 736 sp->bit = 8; | |
| 737 sp->data = 0; | |
| 738 sp->tag = G3_1D; | |
| 739 /* | |
| 740 * This is necessary for Group 4; otherwise it isn't | |
| 741 * needed because the first scanline of each strip ends | |
| 742 * up being copied into the refline. | |
| 743 */ | |
| 744 if (sp->refline) | |
| 745 _TIFFmemset(sp->refline, 0x00, sp->b.rowbytes); | |
| 746 if (is2DEncoding(sp)) { | |
| 747 float res = tif->tif_dir.td_yresolution; | |
| 748 /* | |
| 749 * The CCITT spec says that when doing 2d encoding, you | |
| 750 * should only do it on K consecutive scanlines, where K | |
| 751 * depends on the resolution of the image being encoded | |
| 752 * (2 for <= 200 lpi, 4 for > 200 lpi). Since the directory | |
| 753 * code initializes td_yresolution to 0, this code will | |
| 754 * select a K of 2 unless the YResolution tag is set | |
| 755 * appropriately. (Note also that we fudge a little here | |
| 756 * and use 150 lpi to avoid problems with units conversion.) | |
| 757 */ | |
| 758 if (tif->tif_dir.td_resolutionunit == RESUNIT_CENTIMETER) | |
| 759 res *= 2.54f; /* convert to inches */ | |
| 760 sp->maxk = (res > 150 ? 4 : 2); | |
| 761 sp->k = sp->maxk-1; | |
| 762 } else | |
| 763 sp->k = sp->maxk = 0; | |
| 764 sp->line = 0; | |
| 765 return (1); | |
| 766 } | |
| 767 | |
| 768 static const unsigned char zeroruns[256] = { | |
| 769 8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, /* 0x00 - 0x0f */ | |
| 770 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0x10 - 0x1f */ | |
| 771 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x20 - 0x2f */ | |
| 772 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x30 - 0x3f */ | |
| 773 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x40 - 0x4f */ | |
| 774 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x50 - 0x5f */ | |
| 775 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x60 - 0x6f */ | |
| 776 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x70 - 0x7f */ | |
| 777 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x80 - 0x8f */ | |
| 778 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x90 - 0x9f */ | |
| 779 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xa0 - 0xaf */ | |
| 780 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xb0 - 0xbf */ | |
| 781 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xc0 - 0xcf */ | |
| 782 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xd0 - 0xdf */ | |
| 783 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xe0 - 0xef */ | |
| 784 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xf0 - 0xff */ | |
| 785 }; | |
| 786 static const unsigned char oneruns[256] = { | |
| 787 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x00 - 0x0f */ | |
| 788 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x10 - 0x1f */ | |
| 789 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x20 - 0x2f */ | |
| 790 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x30 - 0x3f */ | |
| 791 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x40 - 0x4f */ | |
| 792 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x50 - 0x5f */ | |
| 793 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x60 - 0x6f */ | |
| 794 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x70 - 0x7f */ | |
| 795 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x80 - 0x8f */ | |
| 796 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x90 - 0x9f */ | |
| 797 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xa0 - 0xaf */ | |
| 798 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xb0 - 0xbf */ | |
| 799 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xc0 - 0xcf */ | |
| 800 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xd0 - 0xdf */ | |
| 801 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0xe0 - 0xef */ | |
| 802 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 8, /* 0xf0 - 0xff */ | |
| 803 }; | |
| 804 | |
| 805 /* | |
| 806 * On certain systems it pays to inline | |
| 807 * the routines that find pixel spans. | |
| 808 */ | |
| 809 #ifdef VAXC | |
| 810 static int32 find0span(unsigned char*, int32, int32); | |
| 811 static int32 find1span(unsigned char*, int32, int32); | |
| 812 #pragma inline(find0span,find1span) | |
| 813 #endif | |
| 814 | |
| 815 /* | |
| 816 * Find a span of ones or zeros using the supplied | |
| 817 * table. The ``base'' of the bit string is supplied | |
| 818 * along with the start+end bit indices. | |
| 819 */ | |
| 820 inline static int32 | |
| 821 find0span(unsigned char* bp, int32 bs, int32 be) | |
| 822 { | |
| 823 int32 bits = be - bs; | |
| 824 int32 n, span; | |
| 825 | |
| 826 bp += bs>>3; | |
| 827 /* | |
| 828 * Check partial byte on lhs. | |
| 829 */ | |
| 830 if (bits > 0 && (n = (bs & 7))) { | |
| 831 span = zeroruns[(*bp << n) & 0xff]; | |
| 832 if (span > 8-n) /* table value too generous */ | |
| 833 span = 8-n; | |
| 834 if (span > bits) /* constrain span to bit range */ | |
| 835 span = bits; | |
| 836 if (n+span < 8) /* doesn't extend to edge of byte */ | |
| 837 return (span); | |
| 838 bits -= span; | |
| 839 bp++; | |
| 840 } else | |
| 841 span = 0; | |
| 842 if (bits >= (int32)(2 * 8 * sizeof(long))) { | |
| 843 long* lp; | |
| 844 /* | |
| 845 * Align to longword boundary and check longwords. | |
| 846 */ | |
| 847 while (!isAligned(bp, long)) { | |
| 848 if (*bp != 0x00) | |
| 849 return (span + zeroruns[*bp]); | |
| 850 span += 8, bits -= 8; | |
| 851 bp++; | |
| 852 } | |
| 853 lp = (long*) bp; | |
| 854 while ((bits >= (int32)(8 * sizeof(long))) && (0 == *lp)) { | |
| 855 span += 8*sizeof (long), bits -= 8*sizeof (long); | |
| 856 lp++; | |
| 857 } | |
| 858 bp = (unsigned char*) lp; | |
| 859 } | |
| 860 /* | |
| 861 * Scan full bytes for all 0's. | |
| 862 */ | |
| 863 while (bits >= 8) { | |
| 864 if (*bp != 0x00) /* end of run */ | |
| 865 return (span + zeroruns[*bp]); | |
| 866 span += 8, bits -= 8; | |
| 867 bp++; | |
| 868 } | |
| 869 /* | |
| 870 * Check partial byte on rhs. | |
| 871 */ | |
| 872 if (bits > 0) { | |
| 873 n = zeroruns[*bp]; | |
| 874 span += (n > bits ? bits : n); | |
| 875 } | |
| 876 return (span); | |
| 877 } | |
| 878 | |
| 879 inline static int32 | |
| 880 find1span(unsigned char* bp, int32 bs, int32 be) | |
| 881 { | |
| 882 int32 bits = be - bs; | |
| 883 int32 n, span; | |
| 884 | |
| 885 bp += bs>>3; | |
| 886 /* | |
| 887 * Check partial byte on lhs. | |
| 888 */ | |
| 889 if (bits > 0 && (n = (bs & 7))) { | |
| 890 span = oneruns[(*bp << n) & 0xff]; | |
| 891 if (span > 8-n) /* table value too generous */ | |
| 892 span = 8-n; | |
| 893 if (span > bits) /* constrain span to bit range */ | |
| 894 span = bits; | |
| 895 if (n+span < 8) /* doesn't extend to edge of byte */ | |
| 896 return (span); | |
| 897 bits -= span; | |
| 898 bp++; | |
| 899 } else | |
| 900 span = 0; | |
| 901 if (bits >= (int32)(2 * 8 * sizeof(long))) { | |
| 902 long* lp; | |
| 903 /* | |
| 904 * Align to longword boundary and check longwords. | |
| 905 */ | |
| 906 while (!isAligned(bp, long)) { | |
| 907 if (*bp != 0xff) | |
| 908 return (span + oneruns[*bp]); | |
| 909 span += 8, bits -= 8; | |
| 910 bp++; | |
| 911 } | |
| 912 lp = (long*) bp; | |
| 913 while ((bits >= (int32)(8 * sizeof(long))) && (~0 == *lp)) { | |
| 914 span += 8*sizeof (long), bits -= 8*sizeof (long); | |
| 915 lp++; | |
| 916 } | |
| 917 bp = (unsigned char*) lp; | |
| 918 } | |
| 919 /* | |
| 920 * Scan full bytes for all 1's. | |
| 921 */ | |
| 922 while (bits >= 8) { | |
| 923 if (*bp != 0xff) /* end of run */ | |
| 924 return (span + oneruns[*bp]); | |
| 925 span += 8, bits -= 8; | |
| 926 bp++; | |
| 927 } | |
| 928 /* | |
| 929 * Check partial byte on rhs. | |
| 930 */ | |
| 931 if (bits > 0) { | |
| 932 n = oneruns[*bp]; | |
| 933 span += (n > bits ? bits : n); | |
| 934 } | |
| 935 return (span); | |
| 936 } | |
| 937 | |
| 938 /* | |
| 939 * Return the offset of the next bit in the range | |
| 940 * [bs..be] that is different from the specified | |
| 941 * color. The end, be, is returned if no such bit | |
| 942 * exists. | |
| 943 */ | |
| 944 #define finddiff(_cp, _bs, _be, _color) \ | |
| 945 (_bs + (_color ? find1span(_cp,_bs,_be) : find0span(_cp,_bs,_be))) | |
| 946 /* | |
| 947 * Like finddiff, but also check the starting bit | |
| 948 * against the end in case start > end. | |
| 949 */ | |
| 950 #define finddiff2(_cp, _bs, _be, _color) \ | |
| 951 (_bs < _be ? finddiff(_cp,_bs,_be,_color) : _be) | |
| 952 | |
| 953 /* | |
| 954 * 1d-encode a row of pixels. The encoding is | |
| 955 * a sequence of all-white or all-black spans | |
| 956 * of pixels encoded with Huffman codes. | |
| 957 */ | |
| 958 static int | |
| 959 Fax3Encode1DRow(TIFF* tif, unsigned char* bp, uint32 bits) | |
| 960 { | |
| 961 Fax3CodecState* sp = EncoderState(tif); | |
| 962 int32 span; | |
| 963 uint32 bs = 0; | |
| 964 | |
| 965 for (;;) { | |
| 966 span = find0span(bp, bs, bits); /* white span */ | |
| 967 putspan(tif, span, TIFFFaxWhiteCodes); | |
| 968 bs += span; | |
| 969 if (bs >= bits) | |
| 970 break; | |
| 971 span = find1span(bp, bs, bits); /* black span */ | |
| 972 putspan(tif, span, TIFFFaxBlackCodes); | |
| 973 bs += span; | |
| 974 if (bs >= bits) | |
| 975 break; | |
| 976 } | |
| 977 if (sp->b.mode & (FAXMODE_BYTEALIGN|FAXMODE_WORDALIGN)) { | |
| 978 if (sp->bit != 8) /* byte-align */ | |
| 979 Fax3FlushBits(tif, sp); | |
| 980 if ((sp->b.mode&FAXMODE_WORDALIGN) && | |
| 981 !isAligned(tif->tif_rawcp, uint16)) | |
| 982 Fax3FlushBits(tif, sp); | |
| 983 } | |
| 984 return (1); | |
| 985 } | |
| 986 | |
| 987 static const tableentry horizcode = | |
| 988 { 3, 0x1, 0 }; /* 001 */ | |
| 989 static const tableentry passcode = | |
| 990 { 4, 0x1, 0 }; /* 0001 */ | |
| 991 static const tableentry vcodes[7] = { | |
| 992 { 7, 0x03, 0 }, /* 0000 011 */ | |
| 993 { 6, 0x03, 0 }, /* 0000 11 */ | |
| 994 { 3, 0x03, 0 }, /* 011 */ | |
| 995 { 1, 0x1, 0 }, /* 1 */ | |
| 996 { 3, 0x2, 0 }, /* 010 */ | |
| 997 { 6, 0x02, 0 }, /* 0000 10 */ | |
| 998 { 7, 0x02, 0 } /* 0000 010 */ | |
| 999 }; | |
| 1000 | |
| 1001 /* | |
| 1002 * 2d-encode a row of pixels. Consult the CCITT | |
| 1003 * documentation for the algorithm. | |
| 1004 */ | |
| 1005 static int | |
| 1006 Fax3Encode2DRow(TIFF* tif, unsigned char* bp, unsigned char* rp, uint32 bits) | |
| 1007 { | |
| 1008 #define PIXEL(buf,ix) ((((buf)[(ix)>>3]) >> (7-((ix)&7))) & 1) | |
| 1009 uint32 a0 = 0; | |
| 1010 uint32 a1 = (PIXEL(bp, 0) != 0 ? 0 : finddiff(bp, 0, bits, 0)); | |
| 1011 uint32 b1 = (PIXEL(rp, 0) != 0 ? 0 : finddiff(rp, 0, bits, 0)); | |
| 1012 uint32 a2, b2; | |
| 1013 | |
| 1014 for (;;) { | |
| 1015 b2 = finddiff2(rp, b1, bits, PIXEL(rp,b1)); | |
| 1016 if (b2 >= a1) { | |
| 1017 int32 d = b1 - a1; | |
| 1018 if (!(-3 <= d && d <= 3)) { /* horizontal mode */ | |
| 1019 a2 = finddiff2(bp, a1, bits, PIXEL(bp,a1)); | |
| 1020 putcode(tif, &horizcode); | |
| 1021 if (a0+a1 == 0 || PIXEL(bp, a0) == 0) { | |
| 1022 putspan(tif, a1-a0, TIFFFaxWhiteCodes); | |
| 1023 putspan(tif, a2-a1, TIFFFaxBlackCodes); | |
| 1024 } else { | |
| 1025 putspan(tif, a1-a0, TIFFFaxBlackCodes); | |
| 1026 putspan(tif, a2-a1, TIFFFaxWhiteCodes); | |
| 1027 } | |
| 1028 a0 = a2; | |
| 1029 } else { /* vertical mode */ | |
| 1030 putcode(tif, &vcodes[d+3]); | |
| 1031 a0 = a1; | |
| 1032 } | |
| 1033 } else { /* pass mode */ | |
| 1034 putcode(tif, &passcode); | |
| 1035 a0 = b2; | |
| 1036 } | |
| 1037 if (a0 >= bits) | |
| 1038 break; | |
| 1039 a1 = finddiff(bp, a0, bits, PIXEL(bp,a0)); | |
| 1040 b1 = finddiff(rp, a0, bits, !PIXEL(bp,a0)); | |
| 1041 b1 = finddiff(rp, b1, bits, PIXEL(bp,a0)); | |
| 1042 } | |
| 1043 return (1); | |
| 1044 #undef PIXEL | |
| 1045 } | |
| 1046 | |
| 1047 /* | |
| 1048 * Encode a buffer of pixels. | |
| 1049 */ | |
| 1050 static int | |
| 1051 Fax3Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) | |
| 1052 { | |
| 1053 static const char module[] = "Fax3Encode"; | |
| 1054 Fax3CodecState* sp = EncoderState(tif); | |
| 1055 (void) s; | |
| 1056 if (cc % sp->b.rowbytes) | |
| 1057 { | |
| 1058 TIFFErrorExt(tif->tif_clientdata, module, "Fractional scanlines
cannot be written"); | |
| 1059 return (0); | |
| 1060 } | |
| 1061 while (cc > 0) { | |
| 1062 if ((sp->b.mode & FAXMODE_NOEOL) == 0) | |
| 1063 Fax3PutEOL(tif); | |
| 1064 if (is2DEncoding(sp)) { | |
| 1065 if (sp->tag == G3_1D) { | |
| 1066 if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels)) | |
| 1067 return (0); | |
| 1068 sp->tag = G3_2D; | |
| 1069 } else { | |
| 1070 if (!Fax3Encode2DRow(tif, bp, sp->refline, | |
| 1071 sp->b.rowpixels)) | |
| 1072 return (0); | |
| 1073 sp->k--; | |
| 1074 } | |
| 1075 if (sp->k == 0) { | |
| 1076 sp->tag = G3_1D; | |
| 1077 sp->k = sp->maxk-1; | |
| 1078 } else | |
| 1079 _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes); | |
| 1080 } else { | |
| 1081 if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels)) | |
| 1082 return (0); | |
| 1083 } | |
| 1084 bp += sp->b.rowbytes; | |
| 1085 cc -= sp->b.rowbytes; | |
| 1086 } | |
| 1087 return (1); | |
| 1088 } | |
| 1089 | |
| 1090 static int | |
| 1091 Fax3PostEncode(TIFF* tif) | |
| 1092 { | |
| 1093 Fax3CodecState* sp = EncoderState(tif); | |
| 1094 | |
| 1095 if (sp->bit != 8) | |
| 1096 Fax3FlushBits(tif, sp); | |
| 1097 return (1); | |
| 1098 } | |
| 1099 | |
| 1100 static void | |
| 1101 Fax3Close(TIFF* tif) | |
| 1102 { | |
| 1103 if ((Fax3State(tif)->mode & FAXMODE_NORTC) == 0) { | |
| 1104 Fax3CodecState* sp = EncoderState(tif); | |
| 1105 unsigned int code = EOL; | |
| 1106 unsigned int length = 12; | |
| 1107 int i; | |
| 1108 | |
| 1109 if (is2DEncoding(sp)) | |
| 1110 code = (code<<1) | (sp->tag == G3_1D), length++; | |
| 1111 for (i = 0; i < 6; i++) | |
| 1112 Fax3PutBits(tif, code, length); | |
| 1113 Fax3FlushBits(tif, sp); | |
| 1114 } | |
| 1115 } | |
| 1116 | |
| 1117 static void | |
| 1118 Fax3Cleanup(TIFF* tif) | |
| 1119 { | |
| 1120 Fax3CodecState* sp = DecoderState(tif); | |
| 1121 | |
| 1122 assert(sp != 0); | |
| 1123 | |
| 1124 tif->tif_tagmethods.vgetfield = sp->b.vgetparent; | |
| 1125 tif->tif_tagmethods.vsetfield = sp->b.vsetparent; | |
| 1126 tif->tif_tagmethods.printdir = sp->b.printdir; | |
| 1127 | |
| 1128 if (sp->runs) | |
| 1129 _TIFFfree(sp->runs); | |
| 1130 if (sp->refline) | |
| 1131 _TIFFfree(sp->refline); | |
| 1132 | |
| 1133 _TIFFfree(tif->tif_data); | |
| 1134 tif->tif_data = NULL; | |
| 1135 | |
| 1136 _TIFFSetDefaultCompressionState(tif); | |
| 1137 } | |
| 1138 | |
| 1139 #define FIELD_BADFAXLINES (FIELD_CODEC+0) | |
| 1140 #define FIELD_CLEANFAXDATA (FIELD_CODEC+1) | |
| 1141 #define FIELD_BADFAXRUN (FIELD_CODEC+2) | |
| 1142 | |
| 1143 #define FIELD_OPTIONS (FIELD_CODEC+7) | |
| 1144 | |
| 1145 static const TIFFField faxFields[] = { | |
| 1146 { TIFFTAG_FAXMODE, 0, 0, TIFF_ANY, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED
, FIELD_PSEUDO, FALSE, FALSE, "FaxMode", NULL }, | |
| 1147 { TIFFTAG_FAXFILLFUNC, 0, 0, TIFF_ANY, 0, TIFF_SETGET_OTHER, TIFF_SETGET_UND
EFINED, FIELD_PSEUDO, FALSE, FALSE, "FaxFillFunc", NULL }, | |
| 1148 { TIFFTAG_BADFAXLINES, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32, TIFF_SETGET_U
INT32, FIELD_BADFAXLINES, TRUE, FALSE, "BadFaxLines", NULL }, | |
| 1149 { TIFFTAG_CLEANFAXDATA, 1, 1, TIFF_SHORT, 0, TIFF_SETGET_UINT16, TIFF_SETGET
_UINT16, FIELD_CLEANFAXDATA, TRUE, FALSE, "CleanFaxData", NULL }, | |
| 1150 { TIFFTAG_CONSECUTIVEBADFAXLINES, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32, TI
FF_SETGET_UINT32, FIELD_BADFAXRUN, TRUE, FALSE, "ConsecutiveBadFaxLines", NULL }
}; | |
| 1151 static const TIFFField fax3Fields[] = { | |
| 1152 { TIFFTAG_GROUP3OPTIONS, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32, TIFF_SETGET
_UINT32, FIELD_OPTIONS, FALSE, FALSE, "Group3Options", NULL }, | |
| 1153 }; | |
| 1154 static const TIFFField fax4Fields[] = { | |
| 1155 { TIFFTAG_GROUP4OPTIONS, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32, TIFF_SETGET
_UINT32, FIELD_OPTIONS, FALSE, FALSE, "Group4Options", NULL }, | |
| 1156 }; | |
| 1157 | |
| 1158 static int | |
| 1159 Fax3VSetField(TIFF* tif, uint32 tag, va_list ap) | |
| 1160 { | |
| 1161 Fax3BaseState* sp = Fax3State(tif); | |
| 1162 const TIFFField* fip; | |
| 1163 | |
| 1164 assert(sp != 0); | |
| 1165 assert(sp->vsetparent != 0); | |
| 1166 | |
| 1167 switch (tag) { | |
| 1168 case TIFFTAG_FAXMODE: | |
| 1169 sp->mode = (int) 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 = (uint32) 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 = (uint32) va_arg(ap, uint32); | |
| 1183 break; | |
| 1184 case TIFFTAG_BADFAXLINES: | |
| 1185 sp->badfaxlines = (uint32) va_arg(ap, uint32); | |
| 1186 break; | |
| 1187 case TIFFTAG_CLEANFAXDATA: | |
| 1188 sp->cleanfaxdata = (uint16) va_arg(ap, uint16_vap); | |
| 1189 break; | |
| 1190 case TIFFTAG_CONSECUTIVEBADFAXLINES: | |
| 1191 sp->badfaxrun = (uint32) va_arg(ap, uint32); | |
| 1192 break; | |
| 1193 default: | |
| 1194 return (*sp->vsetparent)(tif, tag, ap); | |
| 1195 } | |
| 1196 | |
| 1197 if ((fip = TIFFFieldWithTag(tif, tag))) | |
| 1198 TIFFSetFieldBit(tif, fip->field_bit); | |
| 1199 else | |
| 1200 return 0; | |
| 1201 | |
| 1202 tif->tif_flags |= TIFF_DIRTYDIRECT; | |
| 1203 return 1; | |
| 1204 } | |
| 1205 | |
| 1206 static int | |
| 1207 Fax3VGetField(TIFF* tif, uint32 tag, va_list ap) | |
| 1208 { | |
| 1209 Fax3BaseState* sp = Fax3State(tif); | |
| 1210 | |
| 1211 assert(sp != 0); | |
| 1212 | |
| 1213 switch (tag) { | |
| 1214 case TIFFTAG_FAXMODE: | |
| 1215 *va_arg(ap, int*) = sp->mode; | |
| 1216 break; | |
| 1217 case TIFFTAG_FAXFILLFUNC: | |
| 1218 *va_arg(ap, TIFFFaxFillFunc*) = DecoderState(tif)->fill; | |
| 1219 break; | |
| 1220 case TIFFTAG_GROUP3OPTIONS: | |
| 1221 case TIFFTAG_GROUP4OPTIONS: | |
| 1222 *va_arg(ap, uint32*) = sp->groupoptions; | |
| 1223 break; | |
| 1224 case TIFFTAG_BADFAXLINES: | |
| 1225 *va_arg(ap, uint32*) = sp->badfaxlines; | |
| 1226 break; | |
| 1227 case TIFFTAG_CLEANFAXDATA: | |
| 1228 *va_arg(ap, uint16*) = sp->cleanfaxdata; | |
| 1229 break; | |
| 1230 case TIFFTAG_CONSECUTIVEBADFAXLINES: | |
| 1231 *va_arg(ap, uint32*) = sp->badfaxrun; | |
| 1232 break; | |
| 1233 default: | |
| 1234 return (*sp->vgetparent)(tif, tag, ap); | |
| 1235 } | |
| 1236 return (1); | |
| 1237 } | |
| 1238 | |
| 1239 static void | |
| 1240 Fax3PrintDir(TIFF* tif, FILE* fd, long flags) | |
| 1241 { | |
| 1242 Fax3BaseState* sp = Fax3State(tif); | |
| 1243 | |
| 1244 assert(sp != 0); | |
| 1245 | |
| 1246 (void) flags; | |
| 1247 if (TIFFFieldSet(tif,FIELD_OPTIONS)) { | |
| 1248 const char* sep = " "; | |
| 1249 if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4) { | |
| 1250 fprintf(fd, " Group 4 Options:"); | |
| 1251 if (sp->groupoptions & GROUP4OPT_UNCOMPRESSED) | |
| 1252 fprintf(fd, "%suncompressed data", sep); | |
| 1253 } else { | |
| 1254 | |
| 1255 fprintf(fd, " Group 3 Options:"); | |
| 1256 if (sp->groupoptions & GROUP3OPT_2DENCODING) | |
| 1257 fprintf(fd, "%s2-d encoding", sep), sep = "+"; | |
| 1258 if (sp->groupoptions & GROUP3OPT_FILLBITS) | |
| 1259 fprintf(fd, "%sEOL padding", sep), sep = "+"; | |
| 1260 if (sp->groupoptions & GROUP3OPT_UNCOMPRESSED) | |
| 1261 fprintf(fd, "%suncompressed data", sep); | |
| 1262 } | |
| 1263 fprintf(fd, " (%lu = 0x%lx)\n", | |
| 1264 (unsigned long) sp->groupoptions, | |
| 1265 (unsigned long) sp->groupoptions); | |
| 1266 } | |
| 1267 if (TIFFFieldSet(tif,FIELD_CLEANFAXDATA)) { | |
| 1268 fprintf(fd, " Fax Data:"); | |
| 1269 switch (sp->cleanfaxdata) { | |
| 1270 case CLEANFAXDATA_CLEAN: | |
| 1271 fprintf(fd, " clean"); | |
| 1272 break; | |
| 1273 case CLEANFAXDATA_REGENERATED: | |
| 1274 fprintf(fd, " receiver regenerated"); | |
| 1275 break; | |
| 1276 case CLEANFAXDATA_UNCLEAN: | |
| 1277 fprintf(fd, " uncorrected errors"); | |
| 1278 break; | |
| 1279 } | |
| 1280 fprintf(fd, " (%u = 0x%x)\n", | |
| 1281 sp->cleanfaxdata, sp->cleanfaxdata); | |
| 1282 } | |
| 1283 if (TIFFFieldSet(tif,FIELD_BADFAXLINES)) | |
| 1284 fprintf(fd, " Bad Fax Lines: %lu\n", | |
| 1285 (unsigned long) sp->badfaxlines); | |
| 1286 if (TIFFFieldSet(tif,FIELD_BADFAXRUN)) | |
| 1287 fprintf(fd, " Consecutive Bad Fax Lines: %lu\n", | |
| 1288 (unsigned long) sp->badfaxrun); | |
| 1289 if (sp->printdir) | |
| 1290 (*sp->printdir)(tif, fd, flags); | |
| 1291 } | |
| 1292 | |
| 1293 static int | |
| 1294 InitCCITTFax3(TIFF* tif) | |
| 1295 { | |
| 1296 static const char module[] = "InitCCITTFax3"; | |
| 1297 Fax3BaseState* sp; | |
| 1298 | |
| 1299 /* | |
| 1300 * Merge codec-specific tag information. | |
| 1301 */ | |
| 1302 if (!_TIFFMergeFields(tif, faxFields, TIFFArrayCount(faxFields))) { | |
| 1303 TIFFErrorExt(tif->tif_clientdata, "InitCCITTFax3", | |
| 1304 "Merging common CCITT Fax codec-specific tags failed"); | |
| 1305 return 0; | |
| 1306 } | |
| 1307 | |
| 1308 /* | |
| 1309 * Allocate state block so tag methods have storage to record values. | |
| 1310 */ | |
| 1311 tif->tif_data = (uint8*) | |
| 1312 _TIFFmalloc(sizeof (Fax3CodecState)); | |
| 1313 | |
| 1314 if (tif->tif_data == NULL) { | |
| 1315 TIFFErrorExt(tif->tif_clientdata, module, | |
| 1316 "No space for state block"); | |
| 1317 return (0); | |
| 1318 } | |
| 1319 | |
| 1320 sp = Fax3State(tif); | |
| 1321 sp->rw_mode = tif->tif_mode; | |
| 1322 | |
| 1323 /* | |
| 1324 * Override parent get/set field methods. | |
| 1325 */ | |
| 1326 sp->vgetparent = tif->tif_tagmethods.vgetfield; | |
| 1327 tif->tif_tagmethods.vgetfield = Fax3VGetField; /* hook for codec tags */ | |
| 1328 sp->vsetparent = tif->tif_tagmethods.vsetfield; | |
| 1329 tif->tif_tagmethods.vsetfield = Fax3VSetField; /* hook for codec tags */ | |
| 1330 sp->printdir = tif->tif_tagmethods.printdir; | |
| 1331 tif->tif_tagmethods.printdir = Fax3PrintDir; /* hook for codec tags */ | |
| 1332 sp->groupoptions = 0; | |
| 1333 | |
| 1334 if (sp->rw_mode == O_RDONLY) /* FIXME: improve for in place update */ | |
| 1335 tif->tif_flags |= TIFF_NOBITREV; /* decoder does bit reversal */ | |
| 1336 DecoderState(tif)->runs = NULL; | |
| 1337 TIFFSetField(tif, TIFFTAG_FAXFILLFUNC, _TIFFFax3fillruns); | |
| 1338 EncoderState(tif)->refline = NULL; | |
| 1339 | |
| 1340 /* | |
| 1341 * Install codec methods. | |
| 1342 */ | |
| 1343 tif->tif_fixuptags = Fax3FixupTags; | |
| 1344 tif->tif_setupdecode = Fax3SetupState; | |
| 1345 tif->tif_predecode = Fax3PreDecode; | |
| 1346 tif->tif_decoderow = Fax3Decode1D; | |
| 1347 tif->tif_decodestrip = Fax3Decode1D; | |
| 1348 tif->tif_decodetile = Fax3Decode1D; | |
| 1349 tif->tif_setupencode = Fax3SetupState; | |
| 1350 tif->tif_preencode = Fax3PreEncode; | |
| 1351 tif->tif_postencode = Fax3PostEncode; | |
| 1352 tif->tif_encoderow = Fax3Encode; | |
| 1353 tif->tif_encodestrip = Fax3Encode; | |
| 1354 tif->tif_encodetile = Fax3Encode; | |
| 1355 tif->tif_close = Fax3Close; | |
| 1356 tif->tif_cleanup = Fax3Cleanup; | |
| 1357 | |
| 1358 return (1); | |
| 1359 } | |
| 1360 | |
| 1361 int | |
| 1362 TIFFInitCCITTFax3(TIFF* tif, int scheme) | |
| 1363 { | |
| 1364 (void) scheme; | |
| 1365 if (InitCCITTFax3(tif)) { | |
| 1366 /* | |
| 1367 * Merge codec-specific tag information. | |
| 1368 */ | |
| 1369 if (!_TIFFMergeFields(tif, fax3Fields, | |
| 1370 TIFFArrayCount(fax3Fields))) { | |
| 1371 TIFFErrorExt(tif->tif_clientdata, "TIFFInitCCITTFax3", | |
| 1372 "Merging CCITT Fax 3 codec-specific tags failed"); | |
| 1373 return 0; | |
| 1374 } | |
| 1375 | |
| 1376 /* | |
| 1377 * The default format is Class/F-style w/o RTC. | |
| 1378 */ | |
| 1379 return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_CLASSF); | |
| 1380 } else | |
| 1381 return 01; | |
| 1382 } | |
| 1383 | |
| 1384 /* | |
| 1385 * CCITT Group 4 (T.6) Facsimile-compatible | |
| 1386 * Compression Scheme Support. | |
| 1387 */ | |
| 1388 | |
| 1389 #define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; } | |
| 1390 /* | |
| 1391 * Decode the requested amount of G4-encoded data. | |
| 1392 */ | |
| 1393 static int | |
| 1394 Fax4Decode(TIFF* tif, uint8* buf, tmsize_t occ, uint16 s) | |
| 1395 { | |
| 1396 #ifdef FAX3_DEBUG | |
| 1397 FILE* file; | |
| 1398 #endif | |
| 1399 DECLARE_STATE_2D(tif, sp, "Fax4Decode"); | |
| 1400 | |
| 1401 (void) s; | |
| 1402 if (occ % sp->b.rowbytes) | |
| 1403 { | |
| 1404 TIFFErrorExt(tif->tif_clientdata, module, "Fractional scanlines
cannot be read"); | |
| 1405 return (-1); | |
| 1406 } | |
| 1407 CACHE_STATE(tif, sp); | |
| 1408 while (occ > 0) { | |
| 1409 a0 = 0; | |
| 1410 RunLength = 0; | |
| 1411 pa = thisrun = sp->curruns; | |
| 1412 pb = sp->refruns; | |
| 1413 b1 = *pb++; | |
| 1414 #ifdef FAX3_DEBUG | |
| 1415 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail); | |
| 1416 printf("-------------------- %d\n", tif->tif_row); | |
| 1417 fflush(stdout); | |
| 1418 #endif | |
| 1419 EXPAND2D(EOFG4); | |
| 1420 if (EOLcnt) | |
| 1421 goto EOFG4; | |
| 1422 (*sp->fill)(buf, thisrun, pa, lastx); | |
| 1423 #ifdef FAX3_DEBUG | |
| 1424 file = fopen("fillbuf.txt", "a"); | |
| 1425 fwrite(buf, sp->b.rowbytes, 1, file); | |
| 1426 fclose(file); | |
| 1427 #endif | |
| 1428 SETVALUE(0); /* imaginary change for reference */ | |
| 1429 SWAP(uint32*, sp->curruns, sp->refruns); | |
| 1430 buf += sp->b.rowbytes; | |
| 1431 occ -= sp->b.rowbytes; | |
| 1432 sp->line++; | |
| 1433 continue; | |
| 1434 EOFG4: | |
| 1435 NeedBits16( 13, BADG4 ); | |
| 1436 BADG4: | |
| 1437 #ifdef FAX3_DEBUG | |
| 1438 if( GetBits(13) != 0x1001 ) | |
| 1439 fputs( "Bad EOFB\n", stderr ); | |
| 1440 #endif | |
| 1441 ClrBits( 13 ); | |
| 1442 (*sp->fill)(buf, thisrun, pa, lastx); | |
| 1443 #ifdef FAX3_DEBUG | |
| 1444 file = fopen("fillbuf.txt", "a"); | |
| 1445 fwrite(buf, sp->b.rowbytes, 1, file); | |
| 1446 fclose(file); | |
| 1447 #endif | |
| 1448 UNCACHE_STATE(tif, sp); | |
| 1449 return ( sp->line ? 1 : -1); /* don't error on badly-terminat
ed strips */ | |
| 1450 } | |
| 1451 UNCACHE_STATE(tif, sp); | |
| 1452 return (1); | |
| 1453 } | |
| 1454 #undef SWAP | |
| 1455 | |
| 1456 /* | |
| 1457 * Encode the requested amount of data. | |
| 1458 */ | |
| 1459 static int | |
| 1460 Fax4Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) | |
| 1461 { | |
| 1462 static const char module[] = "Fax4Encode"; | |
| 1463 Fax3CodecState *sp = EncoderState(tif); | |
| 1464 (void) s; | |
| 1465 if (cc % sp->b.rowbytes) | |
| 1466 { | |
| 1467 TIFFErrorExt(tif->tif_clientdata, module, "Fractional scanlines
cannot be written"); | |
| 1468 return (0); | |
| 1469 } | |
| 1470 while (cc > 0) { | |
| 1471 if (!Fax3Encode2DRow(tif, bp, sp->refline, sp->b.rowpixels)) | |
| 1472 return (0); | |
| 1473 _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes); | |
| 1474 bp += sp->b.rowbytes; | |
| 1475 cc -= sp->b.rowbytes; | |
| 1476 } | |
| 1477 return (1); | |
| 1478 } | |
| 1479 | |
| 1480 static int | |
| 1481 Fax4PostEncode(TIFF* tif) | |
| 1482 { | |
| 1483 Fax3CodecState *sp = EncoderState(tif); | |
| 1484 | |
| 1485 /* terminate strip w/ EOFB */ | |
| 1486 Fax3PutBits(tif, EOL, 12); | |
| 1487 Fax3PutBits(tif, EOL, 12); | |
| 1488 if (sp->bit != 8) | |
| 1489 Fax3FlushBits(tif, sp); | |
| 1490 return (1); | |
| 1491 } | |
| 1492 | |
| 1493 int | |
| 1494 TIFFInitCCITTFax4(TIFF* tif, int scheme) | |
| 1495 { | |
| 1496 (void) scheme; | |
| 1497 if (InitCCITTFax3(tif)) { /* reuse G3 support */ | |
| 1498 /* | |
| 1499 * Merge codec-specific tag information. | |
| 1500 */ | |
| 1501 if (!_TIFFMergeFields(tif, fax4Fields, | |
| 1502 TIFFArrayCount(fax4Fields))) { | |
| 1503 TIFFErrorExt(tif->tif_clientdata, "TIFFInitCCITTFax4", | |
| 1504 "Merging CCITT Fax 4 codec-specific tags failed"); | |
| 1505 return 0; | |
| 1506 } | |
| 1507 | |
| 1508 tif->tif_decoderow = Fax4Decode; | |
| 1509 tif->tif_decodestrip = Fax4Decode; | |
| 1510 tif->tif_decodetile = Fax4Decode; | |
| 1511 tif->tif_encoderow = Fax4Encode; | |
| 1512 tif->tif_encodestrip = Fax4Encode; | |
| 1513 tif->tif_encodetile = Fax4Encode; | |
| 1514 tif->tif_postencode = Fax4PostEncode; | |
| 1515 /* | |
| 1516 * Suppress RTC at the end of each strip. | |
| 1517 */ | |
| 1518 return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_NORTC); | |
| 1519 } else | |
| 1520 return (0); | |
| 1521 } | |
| 1522 | |
| 1523 /* | |
| 1524 * CCITT Group 3 1-D Modified Huffman RLE Compression Support. | |
| 1525 * (Compression algorithms 2 and 32771) | |
| 1526 */ | |
| 1527 | |
| 1528 /* | |
| 1529 * Decode the requested amount of RLE-encoded data. | |
| 1530 */ | |
| 1531 static int | |
| 1532 Fax3DecodeRLE(TIFF* tif, uint8* buf, tmsize_t occ, uint16 s) | |
| 1533 { | |
| 1534 DECLARE_STATE(tif, sp, "Fax3DecodeRLE"); | |
| 1535 int mode = sp->b.mode; | |
| 1536 (void) s; | |
| 1537 if (occ % sp->b.rowbytes) | |
| 1538 { | |
| 1539 TIFFErrorExt(tif->tif_clientdata, module, "Fractional scanlines
cannot be read"); | |
| 1540 return (-1); | |
| 1541 } | |
| 1542 CACHE_STATE(tif, sp); | |
| 1543 thisrun = sp->curruns; | |
| 1544 while (occ > 0) { | |
| 1545 a0 = 0; | |
| 1546 RunLength = 0; | |
| 1547 pa = thisrun; | |
| 1548 #ifdef FAX3_DEBUG | |
| 1549 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail); | |
| 1550 printf("-------------------- %d\n", tif->tif_row); | |
| 1551 fflush(stdout); | |
| 1552 #endif | |
| 1553 EXPAND1D(EOFRLE); | |
| 1554 (*sp->fill)(buf, thisrun, pa, lastx); | |
| 1555 /* | |
| 1556 * Cleanup at the end of the row. | |
| 1557 */ | |
| 1558 if (mode & FAXMODE_BYTEALIGN) { | |
| 1559 int n = BitsAvail - (BitsAvail &~ 7); | |
| 1560 ClrBits(n); | |
| 1561 } else if (mode & FAXMODE_WORDALIGN) { | |
| 1562 int n = BitsAvail - (BitsAvail &~ 15); | |
| 1563 ClrBits(n); | |
| 1564 if (BitsAvail == 0 && !isAligned(cp, uint16)) | |
| 1565 cp++; | |
| 1566 } | |
| 1567 buf += sp->b.rowbytes; | |
| 1568 occ -= sp->b.rowbytes; | |
| 1569 sp->line++; | |
| 1570 continue; | |
| 1571 EOFRLE: /* premature EOF */ | |
| 1572 (*sp->fill)(buf, thisrun, pa, lastx); | |
| 1573 UNCACHE_STATE(tif, sp); | |
| 1574 return (-1); | |
| 1575 } | |
| 1576 UNCACHE_STATE(tif, sp); | |
| 1577 return (1); | |
| 1578 } | |
| 1579 | |
| 1580 int | |
| 1581 TIFFInitCCITTRLE(TIFF* tif, int scheme) | |
| 1582 { | |
| 1583 (void) scheme; | |
| 1584 if (InitCCITTFax3(tif)) { /* reuse G3 support */ | |
| 1585 tif->tif_decoderow = Fax3DecodeRLE; | |
| 1586 tif->tif_decodestrip = Fax3DecodeRLE; | |
| 1587 tif->tif_decodetile = Fax3DecodeRLE; | |
| 1588 /* | |
| 1589 * Suppress RTC+EOLs when encoding and byte-align data. | |
| 1590 */ | |
| 1591 return TIFFSetField(tif, TIFFTAG_FAXMODE, | |
| 1592 FAXMODE_NORTC|FAXMODE_NOEOL|FAXMODE_BYTEALIGN); | |
| 1593 } else | |
| 1594 return (0); | |
| 1595 } | |
| 1596 | |
| 1597 int | |
| 1598 TIFFInitCCITTRLEW(TIFF* tif, int scheme) | |
| 1599 { | |
| 1600 (void) scheme; | |
| 1601 if (InitCCITTFax3(tif)) { /* reuse G3 support */ | |
| 1602 tif->tif_decoderow = Fax3DecodeRLE; | |
| 1603 tif->tif_decodestrip = Fax3DecodeRLE; | |
| 1604 tif->tif_decodetile = Fax3DecodeRLE; | |
| 1605 /* | |
| 1606 * Suppress RTC+EOLs when encoding and word-align data. | |
| 1607 */ | |
| 1608 return TIFFSetField(tif, TIFFTAG_FAXMODE, | |
| 1609 FAXMODE_NORTC|FAXMODE_NOEOL|FAXMODE_WORDALIGN); | |
| 1610 } else | |
| 1611 return (0); | |
| 1612 } | |
| 1613 #endif /* CCITT_SUPPORT */ | |
| 1614 | |
| 1615 /* vim: set ts=8 sts=8 sw=8 noet: */ | |
| 1616 /* | |
| 1617 * Local Variables: | |
| 1618 * mode: c | |
| 1619 * c-basic-offset: 8 | |
| 1620 * fill-column: 78 | |
| 1621 * End: | |
| 1622 */ | |
| 1623 | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1563103002:
XFA: Upgrade to libtiff 4.0.6. (Closed)
Base URL: https://pdfium.googlesource.com/pdfium.git@xfa