projects / wxWidgets.git / blame
| Commit | Line | Data |
|---|---|---|
| 8414a40c VZ |
1 | /* $Id$ */ |
| 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 | */ | |
| 50 | typedef 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 | } Fax3BaseState; | |
| 67 | #define Fax3State(tif) ((Fax3BaseState*) (tif)->tif_data) | |
| 68 | ||
| 69 | typedef enum { G3_1D, G3_2D } Ttag; | |
| 70 | typedef struct { | |
| 71 | Fax3BaseState b; | |
| 72 | ||
| 73 | /* Decoder state info */ | |
| 74 | const unsigned char* bitmap; /* bit reversal table */ | |
| 75 | uint32 data; /* current i/o byte/word */ | |
| 76 | int bit; /* current i/o bit in byte */ | |
| 77 | int EOLcnt; /* count of EOL codes recognized */ | |
| 78 | TIFFFaxFillFunc fill; /* fill routine */ | |
| 79 | uint32* runs; /* b&w runs for current/previous row */ | |
| 80 | uint32* refruns; /* runs for reference line */ | |
| 81 | uint32* curruns; /* runs for current line */ | |
| 82 | ||
| 83 | /* Encoder state info */ | |
| 84 | Ttag tag; /* encoding state */ | |
| 85 | unsigned char* refline; /* reference line for 2d decoding */ | |
| 86 | int k; /* #rows left that can be 2d encoded */ | |
| 87 | int maxk; /* max #rows that can be 2d encoded */ | |
| 88 | } Fax3CodecState; | |
| 89 | #define DecoderState(tif) ((Fax3CodecState*) Fax3State(tif)) | |
| 90 | #define EncoderState(tif) ((Fax3CodecState*) Fax3State(tif)) | |
| 91 | ||
| 92 | #define is2DEncoding(sp) \ | |
| 93 | (sp->b.groupoptions & GROUP3OPT_2DENCODING) | |
| 94 | #define isAligned(p,t) ((((unsigned long)(p)) & (sizeof (t)-1)) == 0) | |
| 95 | ||
| 96 | /* | |
| 97 | * Group 3 and Group 4 Decoding. | |
| 98 | */ | |
| 99 | ||
| 100 | /* | |
| 101 | * These macros glue the TIFF library state to | |
| 102 | * the state expected by Frank's decoder. | |
| 103 | */ | |
| 104 | #define DECLARE_STATE(tif, sp, mod) \ | |
| 105 | static const char module[] = mod; \ | |
| 106 | Fax3CodecState* sp = DecoderState(tif); \ | |
| 107 | int a0; /* reference element */ \ | |
| 108 | int lastx = sp->b.rowpixels; /* last element in row */ \ | |
| 109 | uint32 BitAcc; /* bit accumulator */ \ | |
| 110 | int BitsAvail; /* # valid bits in BitAcc */ \ | |
| 111 | int RunLength; /* length of current run */ \ | |
| 112 | unsigned char* cp; /* next byte of input data */ \ | |
| 113 | unsigned char* ep; /* end of input data */ \ | |
| 114 | uint32* pa; /* place to stuff next run */ \ | |
| 115 | uint32* thisrun; /* current row's run array */ \ | |
| 116 | int EOLcnt; /* # EOL codes recognized */ \ | |
| 117 | const unsigned char* bitmap = sp->bitmap; /* input data bit reverser */ \ | |
| 118 | const TIFFFaxTabEnt* TabEnt | |
| 119 | #define DECLARE_STATE_2D(tif, sp, mod) \ | |
| 120 | DECLARE_STATE(tif, sp, mod); \ | |
| 121 | int b1; /* next change on prev line */ \ | |
| 122 | uint32* pb /* next run in reference line */\ | |
| 123 | /* | |
| 124 | * Load any state that may be changed during decoding. | |
| 125 | */ | |
| 126 | #define CACHE_STATE(tif, sp) do { \ | |
| 127 | BitAcc = sp->data; \ | |
| 128 | BitsAvail = sp->bit; \ | |
| 129 | EOLcnt = sp->EOLcnt; \ | |
| 130 | cp = (unsigned char*) tif->tif_rawcp; \ | |
| 131 | ep = cp + tif->tif_rawcc; \ | |
| 132 | } while (0) | |
| 133 | /* | |
| 134 | * Save state possibly changed during decoding. | |
| 135 | */ | |
| 136 | #define UNCACHE_STATE(tif, sp) do { \ | |
| 137 | sp->bit = BitsAvail; \ | |
| 138 | sp->data = BitAcc; \ | |
| 139 | sp->EOLcnt = EOLcnt; \ | |
| 140 | tif->tif_rawcc -= (tidata_t) cp - tif->tif_rawcp; \ | |
| 141 | tif->tif_rawcp = (tidata_t) cp; \ | |
| 142 | } while (0) | |
| 143 | ||
| 144 | /* | |
| 145 | * Setup state for decoding a strip. | |
| 146 | */ | |
| 147 | static int | |
| 148 | Fax3PreDecode(TIFF* tif, tsample_t s) | |
| 149 | { | |
| 150 | Fax3CodecState* sp = DecoderState(tif); | |
| 151 | ||
| 152 | (void) s; | |
| 153 | assert(sp != NULL); | |
| 154 | sp->bit = 0; /* force initial read */ | |
| 155 | sp->data = 0; | |
| 156 | sp->EOLcnt = 0; /* force initial scan for EOL */ | |
| 157 | /* | |
| 158 | * Decoder assumes lsb-to-msb bit order. Note that we select | |
| 159 | * this here rather than in Fax3SetupState so that viewers can | |
| 160 | * hold the image open, fiddle with the FillOrder tag value, | |
| 161 | * and then re-decode the image. Otherwise they'd need to close | |
| 162 | * and open the image to get the state reset. | |
| 163 | */ | |
| 164 | sp->bitmap = | |
| 165 | TIFFGetBitRevTable(tif->tif_dir.td_fillorder != FILLORDER_LSB2MSB); | |
| 166 | if (sp->refruns) { /* init reference line to white */ | |
| 167 | sp->refruns[0] = (uint32) sp->b.rowpixels; | |
| 168 | sp->refruns[1] = 0; | |
| 169 | } | |
| 170 | return (1); | |
| 171 | } | |
| 172 | ||
| 173 | /* | |
| 174 | * Routine for handling various errors/conditions. | |
| 175 | * Note how they are "glued into the decoder" by | |
| 176 | * overriding the definitions used by the decoder. | |
| 177 | */ | |
| 178 | ||
| 179 | static void | |
| 180 | Fax3Unexpected(const char* module, TIFF* tif, uint32 line, uint32 a0) | |
| 181 | { | |
| 182 | TIFFErrorExt(tif->tif_clientdata, module, "%s: Bad code word at line %lu of %s %lu (x %lu)", | |
| 183 | tif->tif_name, (unsigned long) line, isTiled(tif) ? "tile" : "strip", | |
| 184 | (unsigned long) (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), | |
| 185 | (unsigned long) a0); | |
| 186 | } | |
| 187 | #define unexpected(table, a0) Fax3Unexpected(module, tif, line, a0) | |
| 188 | ||
| 189 | static void | |
| 190 | Fax3Extension(const char* module, TIFF* tif, uint32 line, uint32 a0) | |
| 191 | { | |
| 192 | TIFFErrorExt(tif->tif_clientdata, module, | |
| 193 | "%s: Uncompressed data (not supported) at line %lu of %s %lu (x %lu)", | |
| 194 | tif->tif_name, (unsigned long) line, isTiled(tif) ? "tile" : "strip", | |
| 195 | (unsigned long) (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), | |
| 196 | (unsigned long) a0); | |
| 197 | } | |
| 198 | #define extension(a0) Fax3Extension(module, tif, line, a0) | |
| 199 | ||
| 200 | static void | |
| 201 | Fax3BadLength(const char* module, TIFF* tif, uint32 line, uint32 a0, uint32 lastx) | |
| 202 | { | |
| 203 | TIFFWarningExt(tif->tif_clientdata, module, "%s: %s at line %lu of %s %lu (got %lu, expected %lu)", | |
| 204 | tif->tif_name, | |
| 205 | a0 < lastx ? "Premature EOL" : "Line length mismatch", | |
| 206 | (unsigned long) line, isTiled(tif) ? "tile" : "strip", | |
| 207 | (unsigned long) (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), | |
| 208 | (unsigned long) a0, lastx); | |
| 209 | } | |
| 210 | #define badlength(a0,lastx) Fax3BadLength(module, tif, line, a0, lastx) | |
| 211 | ||
| 212 | static void | |
| 213 | Fax3PrematureEOF(const char* module, TIFF* tif, uint32 line, uint32 a0) | |
| 214 | { | |
| 215 | TIFFWarningExt(tif->tif_clientdata, module, "%s: Premature EOF at line %lu of %s %lu (x %lu)", | |
| 216 | tif->tif_name, | |
| 217 | (unsigned long) line, isTiled(tif) ? "tile" : "strip", | |
| 218 | (unsigned long) (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), | |
| 219 | (unsigned long) a0); | |
| 220 | } | |
| 221 | #define prematureEOF(a0) Fax3PrematureEOF(module, tif, line, a0) | |
| 222 | ||
| 223 | #define Nop | |
| 224 | ||
| 225 | /* | |
| 226 | * Decode the requested amount of G3 1D-encoded data. | |
| 227 | */ | |
| 228 | static int | |
| 229 | Fax3Decode1D(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s) | |
| 230 | { | |
| 231 | DECLARE_STATE(tif, sp, "Fax3Decode1D"); | |
| 232 | int line = 0; | |
| 233 | ||
| 234 | (void) s; | |
| 235 | CACHE_STATE(tif, sp); | |
| 236 | thisrun = sp->curruns; | |
| 237 | while ((long)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 | 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, tidata_t buf, tsize_t occ, tsample_t s) | |
| 270 | { | |
| 271 | DECLARE_STATE_2D(tif, sp, "Fax3Decode2D"); | |
| 272 | int line = 0; | |
| 273 | int is1D; /* current line is 1d/2d-encoded */ | |
| 274 | ||
| 275 | (void) s; | |
| 276 | CACHE_STATE(tif, sp); | |
| 277 | while ((long)occ > 0) { | |
| 278 | a0 = 0; | |
| 279 | RunLength = 0; | |
| 280 | pa = thisrun = sp->curruns; | |
| 281 | #ifdef FAX3_DEBUG | |
| 282 | printf("\nBitAcc=%08X, BitsAvail = %d EOLcnt = %d", | |
| 283 | BitAcc, BitsAvail, EOLcnt); | |
| 284 | #endif | |
| 285 | SYNC_EOL(EOF2D); | |
| 286 | NeedBits8(1, EOF2D); | |
| 287 | is1D = GetBits(1); /* 1D/2D-encoding tag bit */ | |
| 288 | ClrBits(1); | |
| 289 | #ifdef FAX3_DEBUG | |
| 290 | printf(" %s\n-------------------- %d\n", | |
| 291 | is1D ? "1D" : "2D", tif->tif_row); | |
| 292 | fflush(stdout); | |
| 293 | #endif | |
| 294 | pb = sp->refruns; | |
| 295 | b1 = *pb++; | |
| 296 | if (is1D) | |
| 297 | EXPAND1D(EOF2Da); | |
| 298 | else | |
| 299 | EXPAND2D(EOF2Da); | |
| 300 | (*sp->fill)(buf, thisrun, pa, lastx); | |
| 301 | SETVALUE(0); /* imaginary change for reference */ | |
| 302 | SWAP(uint32*, sp->curruns, sp->refruns); | |
| 303 | buf += sp->b.rowbytes; | |
| 304 | occ -= sp->b.rowbytes; | |
| 305 | line++; | |
| 306 | continue; | |
| 307 | EOF2D: /* premature EOF */ | |
| 308 | CLEANUP_RUNS(); | |
| 309 | EOF2Da: /* premature EOF */ | |
| 310 | (*sp->fill)(buf, thisrun, pa, lastx); | |
| 311 | UNCACHE_STATE(tif, sp); | |
| 312 | return (-1); | |
| 313 | } | |
| 314 | UNCACHE_STATE(tif, sp); | |
| 315 | return (1); | |
| 316 | } | |
| 317 | #undef SWAP | |
| 318 | ||
| 319 | /* | |
| 320 | * The ZERO & FILL macros must handle spans < 2*sizeof(long) bytes. | |
| 321 | * For machines with 64-bit longs this is <16 bytes; otherwise | |
| 322 | * this is <8 bytes. We optimize the code here to reflect the | |
| 323 | * machine characteristics. | |
| 324 | */ | |
| 325 | #if SIZEOF_LONG == 8 | |
| 326 | # define FILL(n, cp) \ | |
| 327 | switch (n) { \ | |
| 328 | case 15:(cp)[14] = 0xff; case 14:(cp)[13] = 0xff; case 13: (cp)[12] = 0xff;\ | |
| 329 | case 12:(cp)[11] = 0xff; case 11:(cp)[10] = 0xff; case 10: (cp)[9] = 0xff;\ | |
| 330 | case 9: (cp)[8] = 0xff; case 8: (cp)[7] = 0xff; case 7: (cp)[6] = 0xff;\ | |
| 331 | case 6: (cp)[5] = 0xff; case 5: (cp)[4] = 0xff; case 4: (cp)[3] = 0xff;\ | |
| 332 | case 3: (cp)[2] = 0xff; case 2: (cp)[1] = 0xff; \ | |
| 333 | case 1: (cp)[0] = 0xff; (cp) += (n); case 0: ; \ | |
| 334 | } | |
| 335 | # define ZERO(n, cp) \ | |
| 336 | switch (n) { \ | |
| 337 | case 15:(cp)[14] = 0; case 14:(cp)[13] = 0; case 13: (cp)[12] = 0; \ | |
| 338 | case 12:(cp)[11] = 0; case 11:(cp)[10] = 0; case 10: (cp)[9] = 0; \ | |
| 339 | case 9: (cp)[8] = 0; case 8: (cp)[7] = 0; case 7: (cp)[6] = 0; \ | |
| 340 | case 6: (cp)[5] = 0; case 5: (cp)[4] = 0; case 4: (cp)[3] = 0; \ | |
| 341 | case 3: (cp)[2] = 0; case 2: (cp)[1] = 0; \ | |
| 342 | case 1: (cp)[0] = 0; (cp) += (n); case 0: ; \ | |
| 343 | } | |
| 344 | #else | |
| 345 | # define FILL(n, cp) \ | |
| 346 | switch (n) { \ | |
| 347 | case 7: (cp)[6] = 0xff; case 6: (cp)[5] = 0xff; case 5: (cp)[4] = 0xff; \ | |
| 348 | case 4: (cp)[3] = 0xff; case 3: (cp)[2] = 0xff; case 2: (cp)[1] = 0xff; \ | |
| 349 | case 1: (cp)[0] = 0xff; (cp) += (n); case 0: ; \ | |
| 350 | } | |
| 351 | # define ZERO(n, cp) \ | |
| 352 | switch (n) { \ | |
| 353 | case 7: (cp)[6] = 0; case 6: (cp)[5] = 0; case 5: (cp)[4] = 0; \ | |
| 354 | case 4: (cp)[3] = 0; case 3: (cp)[2] = 0; case 2: (cp)[1] = 0; \ | |
| 355 | case 1: (cp)[0] = 0; (cp) += (n); case 0: ; \ | |
| 356 | } | |
| 357 | #endif | |
| 358 | ||
| 359 | /* | |
| 360 | * Bit-fill a row according to the white/black | |
| 361 | * runs generated during G3/G4 decoding. | |
| 362 | */ | |
| 363 | void | |
| 364 | _TIFFFax3fillruns(unsigned char* buf, uint32* runs, uint32* erun, uint32 lastx) | |
| 365 | { | |
| 366 | static const unsigned char _fillmasks[] = | |
| 367 | { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff }; | |
| 368 | unsigned char* cp; | |
| 369 | uint32 x, bx, run; | |
| 370 | int32 n, nw; | |
| 371 | long* lp; | |
| 372 | ||
| 373 | if ((erun-runs)&1) | |
| 374 | *erun++ = 0; | |
| 375 | x = 0; | |
| 376 | for (; runs < erun; runs += 2) { | |
| 377 | run = runs[0]; | |
| 378 | if (x+run > lastx || run > lastx ) | |
| 379 | run = runs[0] = (uint32) (lastx - x); | |
| 380 | if (run) { | |
| 381 | cp = buf + (x>>3); | |
| 382 | bx = x&7; | |
| 383 | if (run > 8-bx) { | |
| 384 | if (bx) { /* align to byte boundary */ | |
| 385 | *cp++ &= 0xff << (8-bx); | |
| 386 | run -= 8-bx; | |
| 387 | } | |
| 388 | if( (n = run >> 3) != 0 ) { /* multiple bytes to fill */ | |
| 389 | if ((n/sizeof (long)) > 1) { | |
| 390 | /* | |
| 391 | * Align to longword boundary and fill. | |
| 392 | */ | |
| 393 | for (; n && !isAligned(cp, long); n--) | |
| 394 | *cp++ = 0x00; | |
| 395 | lp = (long*) cp; | |
| 396 | nw = (int32)(n / sizeof (long)); | |
| 397 | n -= nw * sizeof (long); | |
| 398 | do { | |
| 399 | *lp++ = 0L; | |
| 400 | } while (--nw); | |
| 401 | cp = (unsigned char*) lp; | |
| 402 | } | |
| 403 | ZERO(n, cp); | |
| 404 | run &= 7; | |
| 405 | } | |
| 406 | if (run) | |
| 407 | cp[0] &= 0xff >> run; | |
| 408 | } else | |
| 409 | cp[0] &= ~(_fillmasks[run]>>bx); | |
| 410 | x += runs[0]; | |
| 411 | } | |
| 412 | run = runs[1]; | |
| 413 | if (x+run > lastx || run > lastx ) | |
| 414 | run = runs[1] = lastx - x; | |
| 415 | if (run) { | |
| 416 | cp = buf + (x>>3); | |
| 417 | bx = x&7; | |
| 418 | if (run > 8-bx) { | |
| 419 | if (bx) { /* align to byte boundary */ | |
| 420 | *cp++ |= 0xff >> bx; | |
| 421 | run -= 8-bx; | |
| 422 | } | |
| 423 | if( (n = run>>3) != 0 ) { /* multiple bytes to fill */ | |
| 424 | if ((n/sizeof (long)) > 1) { | |
| 425 | /* | |
| 426 | * Align to longword boundary and fill. | |
| 427 | */ | |
| 428 | for (; n && !isAligned(cp, long); n--) | |
| 429 | *cp++ = 0xff; | |
| 430 | lp = (long*) cp; | |
| 431 | nw = (int32)(n / sizeof (long)); | |
| 432 | n -= nw * sizeof (long); | |
| 433 | do { | |
| 434 | *lp++ = -1L; | |
| 435 | } while (--nw); | |
| 436 | cp = (unsigned char*) lp; | |
| 437 | } | |
| 438 | FILL(n, cp); | |
| 439 | run &= 7; | |
| 440 | } | |
| 441 | if (run) | |
| 442 | cp[0] |= 0xff00 >> run; | |
| 443 | } else | |
| 444 | cp[0] |= _fillmasks[run]>>bx; | |
| 445 | x += runs[1]; | |
| 446 | } | |
| 447 | } | |
| 448 | assert(x == lastx); | |
| 449 | } | |
| 450 | #undef ZERO | |
| 451 | #undef FILL | |
| 452 | ||
| 453 | /* | |
| 454 | * Setup G3/G4-related compression/decompression state | |
| 455 | * before data is processed. This routine is called once | |
| 456 | * per image -- it sets up different state based on whether | |
| 457 | * or not decoding or encoding is being done and whether | |
| 458 | * 1D- or 2D-encoded data is involved. | |
| 459 | */ | |
| 460 | static int | |
| 461 | Fax3SetupState(TIFF* tif) | |
| 462 | { | |
| 463 | TIFFDirectory* td = &tif->tif_dir; | |
| 464 | Fax3BaseState* sp = Fax3State(tif); | |
| 465 | int needsRefLine; | |
| 466 | Fax3CodecState* dsp = (Fax3CodecState*) Fax3State(tif); | |
| 467 | uint32 rowbytes, rowpixels, nruns; | |
| 468 | ||
| 469 | if (td->td_bitspersample != 1) { | |
| 470 | TIFFErrorExt(tif->tif_clientdata, tif->tif_name, | |
| 471 | "Bits/sample must be 1 for Group 3/4 encoding/decoding"); | |
| 472 | return (0); | |
| 473 | } | |
| 474 | /* | |
| 475 | * Calculate the scanline/tile widths. | |
| 476 | */ | |
| 477 | if (isTiled(tif)) { | |
| 478 | rowbytes = TIFFTileRowSize(tif); | |
| 479 | rowpixels = td->td_tilewidth; | |
| 480 | } else { | |
| 481 | rowbytes = TIFFScanlineSize(tif); | |
| 482 | rowpixels = td->td_imagewidth; | |
| 483 | } | |
| 484 | sp->rowbytes = (uint32) rowbytes; | |
| 485 | sp->rowpixels = (uint32) rowpixels; | |
| 486 | /* | |
| 487 | * Allocate any additional space required for decoding/encoding. | |
| 488 | */ | |
| 489 | needsRefLine = ( | |
| 490 | (sp->groupoptions & GROUP3OPT_2DENCODING) || | |
| 491 | td->td_compression == COMPRESSION_CCITTFAX4 | |
| 492 | ); | |
| 493 | ||
| 494 | nruns = needsRefLine ? 2*TIFFroundup(rowpixels,32) : rowpixels; | |
| 495 | ||
| 496 | dsp->runs = (uint32*) _TIFFCheckMalloc(tif, 2*nruns+3, sizeof (uint32), | |
| 497 | "for Group 3/4 run arrays"); | |
| 498 | if (dsp->runs == NULL) | |
| 499 | return (0); | |
| 500 | dsp->curruns = dsp->runs; | |
| 501 | if (needsRefLine) | |
| 502 | dsp->refruns = dsp->runs + (nruns>>1); | |
| 503 | else | |
| 504 | dsp->refruns = NULL; | |
| 505 | if (td->td_compression == COMPRESSION_CCITTFAX3 | |
| 506 | && is2DEncoding(dsp)) { /* NB: default is 1D routine */ | |
| 507 | tif->tif_decoderow = Fax3Decode2D; | |
| 508 | tif->tif_decodestrip = Fax3Decode2D; | |
| 509 | tif->tif_decodetile = Fax3Decode2D; | |
| 510 | } | |
| 511 | ||
| 512 | if (needsRefLine) { /* 2d encoding */ | |
| 513 | Fax3CodecState* esp = EncoderState(tif); | |
| 514 | /* | |
| 515 | * 2d encoding requires a scanline | |
| 516 | * buffer for the ``reference line''; the | |
| 517 | * scanline against which delta encoding | |
| 518 | * is referenced. The reference line must | |
| 519 | * be initialized to be ``white'' (done elsewhere). | |
| 520 | */ | |
| 521 | esp->refline = (unsigned char*) _TIFFmalloc(rowbytes); | |
| 522 | if (esp->refline == NULL) { | |
| 523 | TIFFErrorExt(tif->tif_clientdata, "Fax3SetupState", | |
| 524 | "%s: No space for Group 3/4 reference line", | |
| 525 | tif->tif_name); | |
| 526 | return (0); | |
| 527 | } | |
| 528 | } else /* 1d encoding */ | |
| 529 | EncoderState(tif)->refline = NULL; | |
| 530 | ||
| 531 | return (1); | |
| 532 | } | |
| 533 | ||
| 534 | /* | |
| 535 | * CCITT Group 3 FAX Encoding. | |
| 536 | */ | |
| 537 | ||
| 538 | #define Fax3FlushBits(tif, sp) { \ | |
| 539 | if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \ | |
| 540 | (void) TIFFFlushData1(tif); \ | |
| 541 | *(tif)->tif_rawcp++ = (tidataval_t) (sp)->data; \ | |
| 542 | (tif)->tif_rawcc++; \ | |
| 543 | (sp)->data = 0, (sp)->bit = 8; \ | |
| 544 | } | |
| 545 | #define _FlushBits(tif) { \ | |
| 546 | if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \ | |
| 547 | (void) TIFFFlushData1(tif); \ | |
| 548 | *(tif)->tif_rawcp++ = (tidataval_t) data; \ | |
| 549 | (tif)->tif_rawcc++; \ | |
| 550 | data = 0, bit = 8; \ | |
| 551 | } | |
| 552 | static const int _msbmask[9] = | |
| 553 | { 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff }; | |
| 554 | #define _PutBits(tif, bits, length) { \ | |
| 555 | while (length > bit) { \ | |
| 556 | data |= bits >> (length - bit); \ | |
| 557 | length -= bit; \ | |
| 558 | _FlushBits(tif); \ | |
| 559 | } \ | |
| 560 | data |= (bits & _msbmask[length]) << (bit - length); \ | |
| 561 | bit -= length; \ | |
| 562 | if (bit == 0) \ | |
| 563 | _FlushBits(tif); \ | |
| 564 | } | |
| 565 | ||
| 566 | /* | |
| 567 | * Write a variable-length bit-value to | |
| 568 | * the output stream. Values are | |
| 569 | * assumed to be at most 16 bits. | |
| 570 | */ | |
| 571 | static void | |
| 572 | Fax3PutBits(TIFF* tif, unsigned int bits, unsigned int length) | |
| 573 | { | |
| 574 | Fax3CodecState* sp = EncoderState(tif); | |
| 575 | unsigned int bit = sp->bit; | |
| 576 | int data = sp->data; | |
| 577 | ||
| 578 | _PutBits(tif, bits, length); | |
| 579 | ||
| 580 | sp->data = data; | |
| 581 | sp->bit = bit; | |
| 582 | } | |
| 583 | ||
| 584 | /* | |
| 585 | * Write a code to the output stream. | |
| 586 | */ | |
| 587 | #define putcode(tif, te) Fax3PutBits(tif, (te)->code, (te)->length) | |
| 588 | ||
| 589 | #ifdef FAX3_DEBUG | |
| 590 | #define DEBUG_COLOR(w) (tab == TIFFFaxWhiteCodes ? w "W" : w "B") | |
| 591 | #define DEBUG_PRINT(what,len) { \ | |
| 592 | int t; \ | |
| 593 | printf("%08X/%-2d: %s%5d\t", data, bit, DEBUG_COLOR(what), len); \ | |
| 594 | for (t = length-1; t >= 0; t--) \ | |
| 595 | putchar(code & (1<<t) ? '1' : '0'); \ | |
| 596 | putchar('\n'); \ | |
| 597 | } | |
| 598 | #endif | |
| 599 | ||
| 600 | /* | |
| 601 | * Write the sequence of codes that describes | |
| 602 | * the specified span of zero's or one's. The | |
| 603 | * appropriate table that holds the make-up and | |
| 604 | * terminating codes is supplied. | |
| 605 | */ | |
| 606 | static void | |
| 607 | putspan(TIFF* tif, int32 span, const tableentry* tab) | |
| 608 | { | |
| 609 | Fax3CodecState* sp = EncoderState(tif); | |
| 610 | unsigned int bit = sp->bit; | |
| 611 | int data = sp->data; | |
| 612 | unsigned int code, length; | |
| 613 | ||
| 614 | while (span >= 2624) { | |
| 615 | const tableentry* te = &tab[63 + (2560>>6)]; | |
| 616 | code = te->code, length = te->length; | |
| 617 | #ifdef FAX3_DEBUG | |
| 618 | DEBUG_PRINT("MakeUp", te->runlen); | |
| 619 | #endif | |
| 620 | _PutBits(tif, code, length); | |
| 621 | span -= te->runlen; | |
| 622 | } | |
| 623 | if (span >= 64) { | |
| 624 | const tableentry* te = &tab[63 + (span>>6)]; | |
| 625 | assert(te->runlen == 64*(span>>6)); | |
| 626 | code = te->code, length = te->length; | |
| 627 | #ifdef FAX3_DEBUG | |
| 628 | DEBUG_PRINT("MakeUp", te->runlen); | |
| 629 | #endif | |
| 630 | _PutBits(tif, code, length); | |
| 631 | span -= te->runlen; | |
| 632 | } | |
| 633 | code = tab[span].code, length = tab[span].length; | |
| 634 | #ifdef FAX3_DEBUG | |
| 635 | DEBUG_PRINT(" Term", tab[span].runlen); | |
| 636 | #endif | |
| 637 | _PutBits(tif, code, length); | |
| 638 | ||
| 639 | sp->data = data; | |
| 640 | sp->bit = bit; | |
| 641 | } | |
| 642 | ||
| 643 | /* | |
| 644 | * Write an EOL code to the output stream. The zero-fill | |
| 645 | * logic for byte-aligning encoded scanlines is handled | |
| 646 | * here. We also handle writing the tag bit for the next | |
| 647 | * scanline when doing 2d encoding. | |
| 648 | */ | |
| 649 | static void | |
| 650 | Fax3PutEOL(TIFF* tif) | |
| 651 | { | |
| 652 | Fax3CodecState* sp = EncoderState(tif); | |
| 653 | unsigned int bit = sp->bit; | |
| 654 | int data = sp->data; | |
| 655 | unsigned int code, length, tparm; | |
| 656 | ||
| 657 | if (sp->b.groupoptions & GROUP3OPT_FILLBITS) { | |
| 658 | /* | |
| 659 | * Force bit alignment so EOL will terminate on | |
| 660 | * a byte boundary. That is, force the bit alignment | |
| 661 | * to 16-12 = 4 before putting out the EOL code. | |
| 662 | */ | |
| 663 | int align = 8 - 4; | |
| 664 | if (align != sp->bit) { | |
| 665 | if (align > sp->bit) | |
| 666 | align = sp->bit + (8 - align); | |
| 667 | else | |
| 668 | align = sp->bit - align; | |
| 669 | code = 0; | |
| 670 | tparm=align; | |
| 671 | _PutBits(tif, 0, tparm); | |
| 672 | } | |
| 673 | } | |
| 674 | code = EOL, length = 12; | |
| 675 | if (is2DEncoding(sp)) | |
| 676 | code = (code<<1) | (sp->tag == G3_1D), length++; | |
| 677 | _PutBits(tif, code, length); | |
| 678 | ||
| 679 | sp->data = data; | |
| 680 | sp->bit = bit; | |
| 681 | } | |
| 682 | ||
| 683 | /* | |
| 684 | * Reset encoding state at the start of a strip. | |
| 685 | */ | |
| 686 | static int | |
| 687 | Fax3PreEncode(TIFF* tif, tsample_t s) | |
| 688 | { | |
| 689 | Fax3CodecState* sp = EncoderState(tif); | |
| 690 | ||
| 691 | (void) s; | |
| 692 | assert(sp != NULL); | |
| 693 | sp->bit = 8; | |
| 694 | sp->data = 0; | |
| 695 | sp->tag = G3_1D; | |
| 696 | /* | |
| 697 | * This is necessary for Group 4; otherwise it isn't | |
| 698 | * needed because the first scanline of each strip ends | |
| 699 | * up being copied into the refline. | |
| 700 | */ | |
| 701 | if (sp->refline) | |
| 702 | _TIFFmemset(sp->refline, 0x00, sp->b.rowbytes); | |
| 703 | if (is2DEncoding(sp)) { | |
| 704 | float res = tif->tif_dir.td_yresolution; | |
| 705 | /* | |
| 706 | * The CCITT spec says that when doing 2d encoding, you | |
| 707 | * should only do it on K consecutive scanlines, where K | |
| 708 | * depends on the resolution of the image being encoded | |
| 709 | * (2 for <= 200 lpi, 4 for > 200 lpi). Since the directory | |
| 710 | * code initializes td_yresolution to 0, this code will | |
| 711 | * select a K of 2 unless the YResolution tag is set | |
| 712 | * appropriately. (Note also that we fudge a little here | |
| 713 | * and use 150 lpi to avoid problems with units conversion.) | |
| 714 | */ | |
| 715 | if (tif->tif_dir.td_resolutionunit == RESUNIT_CENTIMETER) | |
| 716 | res *= 2.54f; /* convert to inches */ | |
| 717 | sp->maxk = (res > 150 ? 4 : 2); | |
| 718 | sp->k = sp->maxk-1; | |
| 719 | } else | |
| 720 | sp->k = sp->maxk = 0; | |
| 721 | return (1); | |
| 722 | } | |
| 723 | ||
| 724 | static const unsigned char zeroruns[256] = { | |
| 725 | 8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, /* 0x00 - 0x0f */ | |
| 726 | 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0x10 - 0x1f */ | |
| 727 | 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x20 - 0x2f */ | |
| 728 | 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x30 - 0x3f */ | |
| 729 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x40 - 0x4f */ | |
| 730 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x50 - 0x5f */ | |
| 731 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x60 - 0x6f */ | |
| 732 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x70 - 0x7f */ | |
| 733 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x80 - 0x8f */ | |
| 734 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x90 - 0x9f */ | |
| 735 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xa0 - 0xaf */ | |
| 736 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xb0 - 0xbf */ | |
| 737 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xc0 - 0xcf */ | |
| 738 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xd0 - 0xdf */ | |
| 739 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xe0 - 0xef */ | |
| 740 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xf0 - 0xff */ | |
| 741 | }; | |
| 742 | static const unsigned char oneruns[256] = { | |
| 743 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x00 - 0x0f */ | |
| 744 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x10 - 0x1f */ | |
| 745 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x20 - 0x2f */ | |
| 746 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x30 - 0x3f */ | |
| 747 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x40 - 0x4f */ | |
| 748 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x50 - 0x5f */ | |
| 749 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x60 - 0x6f */ | |
| 750 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x70 - 0x7f */ | |
| 751 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x80 - 0x8f */ | |
| 752 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x90 - 0x9f */ | |
| 753 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xa0 - 0xaf */ | |
| 754 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xb0 - 0xbf */ | |
| 755 | 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xc0 - 0xcf */ | |
| 756 | 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xd0 - 0xdf */ | |
| 757 | 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0xe0 - 0xef */ | |
| 758 | 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 8, /* 0xf0 - 0xff */ | |
| 759 | }; | |
| 760 | ||
| 761 | /* | |
| 762 | * On certain systems it pays to inline | |
| 763 | * the routines that find pixel spans. | |
| 764 | */ | |
| 765 | #ifdef VAXC | |
| 766 | static int32 find0span(unsigned char*, int32, int32); | |
| 767 | static int32 find1span(unsigned char*, int32, int32); | |
| 768 | #pragma inline(find0span,find1span) | |
| 769 | #endif | |
| 770 | ||
| 771 | /* | |
| 772 | * Find a span of ones or zeros using the supplied | |
| 773 | * table. The ``base'' of the bit string is supplied | |
| 774 | * along with the start+end bit indices. | |
| 775 | */ | |
| 776 | inline static int32 | |
| 777 | find0span(unsigned char* bp, int32 bs, int32 be) | |
| 778 | { | |
| 779 | int32 bits = be - bs; | |
| 780 | int32 n, span; | |
| 781 | ||
| 782 | bp += bs>>3; | |
| 783 | /* | |
| 784 | * Check partial byte on lhs. | |
| 785 | */ | |
| 786 | if (bits > 0 && (n = (bs & 7))) { | |
| 787 | span = zeroruns[(*bp << n) & 0xff]; | |
| 788 | if (span > 8-n) /* table value too generous */ | |
| 789 | span = 8-n; | |
| 790 | if (span > bits) /* constrain span to bit range */ | |
| 791 | span = bits; | |
| 792 | if (n+span < 8) /* doesn't extend to edge of byte */ | |
| 793 | return (span); | |
| 794 | bits -= span; | |
| 795 | bp++; | |
| 796 | } else | |
| 797 | span = 0; | |
| 798 | if (bits >= (int32)(2 * 8 * sizeof(long))) { | |
| 799 | long* lp; | |
| 800 | /* | |
| 801 | * Align to longword boundary and check longwords. | |
| 802 | */ | |
| 803 | while (!isAligned(bp, long)) { | |
| 804 | if (*bp != 0x00) | |
| 805 | return (span + zeroruns[*bp]); | |
| 806 | span += 8, bits -= 8; | |
| 807 | bp++; | |
| 808 | } | |
| 809 | lp = (long*) bp; | |
| 810 | while ((bits >= (int32)(8 * sizeof(long))) && (0 == *lp)) { | |
| 811 | span += 8*sizeof (long), bits -= 8*sizeof (long); | |
| 812 | lp++; | |
| 813 | } | |
| 814 | bp = (unsigned char*) lp; | |
| 815 | } | |
| 816 | /* | |
| 817 | * Scan full bytes for all 0's. | |
| 818 | */ | |
| 819 | while (bits >= 8) { | |
| 820 | if (*bp != 0x00) /* end of run */ | |
| 821 | return (span + zeroruns[*bp]); | |
| 822 | span += 8, bits -= 8; | |
| 823 | bp++; | |
| 824 | } | |
| 825 | /* | |
| 826 | * Check partial byte on rhs. | |
| 827 | */ | |
| 828 | if (bits > 0) { | |
| 829 | n = zeroruns[*bp]; | |
| 830 | span += (n > bits ? bits : n); | |
| 831 | } | |
| 832 | return (span); | |
| 833 | } | |
| 834 | ||
| 835 | inline static int32 | |
| 836 | find1span(unsigned char* bp, int32 bs, int32 be) | |
| 837 | { | |
| 838 | int32 bits = be - bs; | |
| 839 | int32 n, span; | |
| 840 | ||
| 841 | bp += bs>>3; | |
| 842 | /* | |
| 843 | * Check partial byte on lhs. | |
| 844 | */ | |
| 845 | if (bits > 0 && (n = (bs & 7))) { | |
| 846 | span = oneruns[(*bp << n) & 0xff]; | |
| 847 | if (span > 8-n) /* table value too generous */ | |
| 848 | span = 8-n; | |
| 849 | if (span > bits) /* constrain span to bit range */ | |
| 850 | span = bits; | |
| 851 | if (n+span < 8) /* doesn't extend to edge of byte */ | |
| 852 | return (span); | |
| 853 | bits -= span; | |
| 854 | bp++; | |
| 855 | } else | |
| 856 | span = 0; | |
| 857 | if (bits >= (int32)(2 * 8 * sizeof(long))) { | |
| 858 | long* lp; | |
| 859 | /* | |
| 860 | * Align to longword boundary and check longwords. | |
| 861 | */ | |
| 862 | while (!isAligned(bp, long)) { | |
| 863 | if (*bp != 0xff) | |
| 864 | return (span + oneruns[*bp]); | |
| 865 | span += 8, bits -= 8; | |
| 866 | bp++; | |
| 867 | } | |
| 868 | lp = (long*) bp; | |
| 869 | while ((bits >= (int32)(8 * sizeof(long))) && (~0 == *lp)) { | |
| 870 | span += 8*sizeof (long), bits -= 8*sizeof (long); | |
| 871 | lp++; | |
| 872 | } | |
| 873 | bp = (unsigned char*) lp; | |
| 874 | } | |
| 875 | /* | |
| 876 | * Scan full bytes for all 1's. | |
| 877 | */ | |
| 878 | while (bits >= 8) { | |
| 879 | if (*bp != 0xff) /* end of run */ | |
| 880 | return (span + oneruns[*bp]); | |
| 881 | span += 8, bits -= 8; | |
| 882 | bp++; | |
| 883 | } | |
| 884 | /* | |
| 885 | * Check partial byte on rhs. | |
| 886 | */ | |
| 887 | if (bits > 0) { | |
| 888 | n = oneruns[*bp]; | |
| 889 | span += (n > bits ? bits : n); | |
| 890 | } | |
| 891 | return (span); | |
| 892 | } | |
| 893 | ||
| 894 | /* | |
| 895 | * Return the offset of the next bit in the range | |
| 896 | * [bs..be] that is different from the specified | |
| 897 | * color. The end, be, is returned if no such bit | |
| 898 | * exists. | |
| 899 | */ | |
| 900 | #define finddiff(_cp, _bs, _be, _color) \ | |
| 901 | (_bs + (_color ? find1span(_cp,_bs,_be) : find0span(_cp,_bs,_be))) | |
| 902 | /* | |
| 903 | * Like finddiff, but also check the starting bit | |
| 904 | * against the end in case start > end. | |
| 905 | */ | |
| 906 | #define finddiff2(_cp, _bs, _be, _color) \ | |
| 907 | (_bs < _be ? finddiff(_cp,_bs,_be,_color) : _be) | |
| 908 | ||
| 909 | /* | |
| 910 | * 1d-encode a row of pixels. The encoding is | |
| 911 | * a sequence of all-white or all-black spans | |
| 912 | * of pixels encoded with Huffman codes. | |
| 913 | */ | |
| 914 | static int | |
| 915 | Fax3Encode1DRow(TIFF* tif, unsigned char* bp, uint32 bits) | |
| 916 | { | |
| 917 | Fax3CodecState* sp = EncoderState(tif); | |
| 918 | int32 span; | |
| 919 | uint32 bs = 0; | |
| 920 | ||
| 921 | for (;;) { | |
| 922 | span = find0span(bp, bs, bits); /* white span */ | |
| 923 | putspan(tif, span, TIFFFaxWhiteCodes); | |
| 924 | bs += span; | |
| 925 | if (bs >= bits) | |
| 926 | break; | |
| 927 | span = find1span(bp, bs, bits); /* black span */ | |
| 928 | putspan(tif, span, TIFFFaxBlackCodes); | |
| 929 | bs += span; | |
| 930 | if (bs >= bits) | |
| 931 | break; | |
| 932 | } | |
| 933 | if (sp->b.mode & (FAXMODE_BYTEALIGN|FAXMODE_WORDALIGN)) { | |
| 934 | if (sp->bit != 8) /* byte-align */ | |
| 935 | Fax3FlushBits(tif, sp); | |
| 936 | if ((sp->b.mode&FAXMODE_WORDALIGN) && | |
| 937 | !isAligned(tif->tif_rawcp, uint16)) | |
| 938 | Fax3FlushBits(tif, sp); | |
| 939 | } | |
| 940 | return (1); | |
| 941 | } | |
| 942 | ||
| 943 | static const tableentry horizcode = | |
| 944 | { 3, 0x1, 0 }; /* 001 */ | |
| 945 | static const tableentry passcode = | |
| 946 | { 4, 0x1, 0 }; /* 0001 */ | |
| 947 | static const tableentry vcodes[7] = { | |
| 948 | { 7, 0x03, 0 }, /* 0000 011 */ | |
| 949 | { 6, 0x03, 0 }, /* 0000 11 */ | |
| 950 | { 3, 0x03, 0 }, /* 011 */ | |
| 951 | { 1, 0x1, 0 }, /* 1 */ | |
| 952 | { 3, 0x2, 0 }, /* 010 */ | |
| 953 | { 6, 0x02, 0 }, /* 0000 10 */ | |
| 954 | { 7, 0x02, 0 } /* 0000 010 */ | |
| 955 | }; | |
| 956 | ||
| 957 | /* | |
| 958 | * 2d-encode a row of pixels. Consult the CCITT | |
| 959 | * documentation for the algorithm. | |
| 960 | */ | |
| 961 | static int | |
| 962 | Fax3Encode2DRow(TIFF* tif, unsigned char* bp, unsigned char* rp, uint32 bits) | |
| 963 | { | |
| 964 | #define PIXEL(buf,ix) ((((buf)[(ix)>>3]) >> (7-((ix)&7))) & 1) | |
| 965 | uint32 a0 = 0; | |
| 966 | uint32 a1 = (PIXEL(bp, 0) != 0 ? 0 : finddiff(bp, 0, bits, 0)); | |
| 967 | uint32 b1 = (PIXEL(rp, 0) != 0 ? 0 : finddiff(rp, 0, bits, 0)); | |
| 968 | uint32 a2, b2; | |
| 969 | ||
| 970 | for (;;) { | |
| 971 | b2 = finddiff2(rp, b1, bits, PIXEL(rp,b1)); | |
| 972 | if (b2 >= a1) { | |
| 973 | int32 d = b1 - a1; | |
| 974 | if (!(-3 <= d && d <= 3)) { /* horizontal mode */ | |
| 975 | a2 = finddiff2(bp, a1, bits, PIXEL(bp,a1)); | |
| 976 | putcode(tif, &horizcode); | |
| 977 | if (a0+a1 == 0 || PIXEL(bp, a0) == 0) { | |
| 978 | putspan(tif, a1-a0, TIFFFaxWhiteCodes); | |
| 979 | putspan(tif, a2-a1, TIFFFaxBlackCodes); | |
| 980 | } else { | |
| 981 | putspan(tif, a1-a0, TIFFFaxBlackCodes); | |
| 982 | putspan(tif, a2-a1, TIFFFaxWhiteCodes); | |
| 983 | } | |
| 984 | a0 = a2; | |
| 985 | } else { /* vertical mode */ | |
| 986 | putcode(tif, &vcodes[d+3]); | |
| 987 | a0 = a1; | |
| 988 | } | |
| 989 | } else { /* pass mode */ | |
| 990 | putcode(tif, &passcode); | |
| 991 | a0 = b2; | |
| 992 | } | |
| 993 | if (a0 >= bits) | |
| 994 | break; | |
| 995 | a1 = finddiff(bp, a0, bits, PIXEL(bp,a0)); | |
| 996 | b1 = finddiff(rp, a0, bits, !PIXEL(bp,a0)); | |
| 997 | b1 = finddiff(rp, b1, bits, PIXEL(bp,a0)); | |
| 998 | } | |
| 999 | return (1); | |
| 1000 | #undef PIXEL | |
| 1001 | } | |
| 1002 | ||
| 1003 | /* | |
| 1004 | * Encode a buffer of pixels. | |
| 1005 | */ | |
| 1006 | static int | |
| 1007 | Fax3Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s) | |
| 1008 | { | |
| 1009 | Fax3CodecState* sp = EncoderState(tif); | |
| 1010 | ||
| 1011 | (void) s; | |
| 1012 | while ((long)cc > 0) { | |
| 1013 | if ((sp->b.mode & FAXMODE_NOEOL) == 0) | |
| 1014 | Fax3PutEOL(tif); | |
| 1015 | if (is2DEncoding(sp)) { | |
| 1016 | if (sp->tag == G3_1D) { | |
| 1017 | if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels)) | |
| 1018 | return (0); | |
| 1019 | sp->tag = G3_2D; | |
| 1020 | } else { | |
| 1021 | if (!Fax3Encode2DRow(tif, bp, sp->refline, | |
| 1022 | sp->b.rowpixels)) | |
| 1023 | return (0); | |
| 1024 | sp->k--; | |
| 1025 | } | |
| 1026 | if (sp->k == 0) { | |
| 1027 | sp->tag = G3_1D; | |
| 1028 | sp->k = sp->maxk-1; | |
| 1029 | } else | |
| 1030 | _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes); | |
| 1031 | } else { | |
| 1032 | if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels)) | |
| 1033 | return (0); | |
| 1034 | } | |
| 1035 | bp += sp->b.rowbytes; | |
| 1036 | cc -= sp->b.rowbytes; | |
| 1037 | } | |
| 1038 | return (1); | |
| 1039 | } | |
| 1040 | ||
| 1041 | static int | |
| 1042 | Fax3PostEncode(TIFF* tif) | |
| 1043 | { | |
| 1044 | Fax3CodecState* sp = EncoderState(tif); | |
| 1045 | ||
| 1046 | if (sp->bit != 8) | |
| 1047 | Fax3FlushBits(tif, sp); | |
| 1048 | return (1); | |
| 1049 | } | |
| 1050 | ||
| 1051 | static void | |
| 1052 | Fax3Close(TIFF* tif) | |
| 1053 | { | |
| 1054 | if ((Fax3State(tif)->mode & FAXMODE_NORTC) == 0) { | |
| 1055 | Fax3CodecState* sp = EncoderState(tif); | |
| 1056 | unsigned int code = EOL; | |
| 1057 | unsigned int length = 12; | |
| 1058 | int i; | |
| 1059 | ||
| 1060 | if (is2DEncoding(sp)) | |
| 1061 | code = (code<<1) | (sp->tag == G3_1D), length++; | |
| 1062 | for (i = 0; i < 6; i++) | |
| 1063 | Fax3PutBits(tif, code, length); | |
| 1064 | Fax3FlushBits(tif, sp); | |
| 1065 | } | |
| 1066 | } | |
| 1067 | ||
| 1068 | static void | |
| 1069 | Fax3Cleanup(TIFF* tif) | |
| 1070 | { | |
| 1071 | Fax3CodecState* sp = DecoderState(tif); | |
| 1072 | ||
| 1073 | assert(sp != 0); | |
| 1074 | ||
| 1075 | tif->tif_tagmethods.vgetfield = sp->b.vgetparent; | |
| 1076 | tif->tif_tagmethods.vsetfield = sp->b.vsetparent; | |
| 1077 | ||
| 1078 | if (sp->runs) | |
| 1079 | _TIFFfree(sp->runs); | |
| 1080 | if (sp->refline) | |
| 1081 | _TIFFfree(sp->refline); | |
| 1082 | ||
| 1083 | if (Fax3State(tif)->subaddress) | |
| 1084 | _TIFFfree(Fax3State(tif)->subaddress); | |
| 1085 | _TIFFfree(tif->tif_data); | |
| 1086 | tif->tif_data = NULL; | |
| 1087 | ||
| 1088 | _TIFFSetDefaultCompressionState(tif); | |
| 1089 | } | |
| 1090 | ||
| 1091 | #define FIELD_BADFAXLINES (FIELD_CODEC+0) | |
| 1092 | #define FIELD_CLEANFAXDATA (FIELD_CODEC+1) | |
| 1093 | #define FIELD_BADFAXRUN (FIELD_CODEC+2) | |
| 1094 | #define FIELD_RECVPARAMS (FIELD_CODEC+3) | |
| 1095 | #define FIELD_SUBADDRESS (FIELD_CODEC+4) | |
| 1096 | #define FIELD_RECVTIME (FIELD_CODEC+5) | |
| 1097 | #define FIELD_FAXDCS (FIELD_CODEC+6) | |
| 1098 | ||
| 1099 | #define FIELD_OPTIONS (FIELD_CODEC+7) | |
| 1100 | ||
| 1101 | static const TIFFFieldInfo faxFieldInfo[] = { | |
| 1102 | { TIFFTAG_FAXMODE, 0, 0, TIFF_ANY, FIELD_PSEUDO, | |
| 1103 | FALSE, FALSE, "FaxMode" }, | |
| 1104 | { TIFFTAG_FAXFILLFUNC, 0, 0, TIFF_ANY, FIELD_PSEUDO, | |
| 1105 | FALSE, FALSE, "FaxFillFunc" }, | |
| 1106 | { TIFFTAG_BADFAXLINES, 1, 1, TIFF_LONG, FIELD_BADFAXLINES, | |
| 1107 | TRUE, FALSE, "BadFaxLines" }, | |
| 1108 | { TIFFTAG_BADFAXLINES, 1, 1, TIFF_SHORT, FIELD_BADFAXLINES, | |
| 1109 | TRUE, FALSE, "BadFaxLines" }, | |
| 1110 | { TIFFTAG_CLEANFAXDATA, 1, 1, TIFF_SHORT, FIELD_CLEANFAXDATA, | |
| 1111 | TRUE, FALSE, "CleanFaxData" }, | |
| 1112 | { TIFFTAG_CONSECUTIVEBADFAXLINES,1,1, TIFF_LONG, FIELD_BADFAXRUN, | |
| 1113 | TRUE, FALSE, "ConsecutiveBadFaxLines" }, | |
| 1114 | { TIFFTAG_CONSECUTIVEBADFAXLINES,1,1, TIFF_SHORT, FIELD_BADFAXRUN, | |
| 1115 | TRUE, FALSE, "ConsecutiveBadFaxLines" }, | |
| 1116 | { TIFFTAG_FAXRECVPARAMS, 1, 1, TIFF_LONG, FIELD_RECVPARAMS, | |
| 1117 | TRUE, FALSE, "FaxRecvParams" }, | |
| 1118 | { TIFFTAG_FAXSUBADDRESS, -1,-1, TIFF_ASCII, FIELD_SUBADDRESS, | |
| 1119 | TRUE, FALSE, "FaxSubAddress" }, | |
| 1120 | { TIFFTAG_FAXRECVTIME, 1, 1, TIFF_LONG, FIELD_RECVTIME, | |
| 1121 | TRUE, FALSE, "FaxRecvTime" }, | |
| 1122 | { TIFFTAG_FAXDCS, -1,-1, TIFF_ASCII, FIELD_FAXDCS, | |
| 1123 | TRUE, FALSE, "FaxDcs" }, | |
| 1124 | }; | |
| 1125 | static const TIFFFieldInfo fax3FieldInfo[] = { | |
| 1126 | { TIFFTAG_GROUP3OPTIONS, 1, 1, TIFF_LONG, FIELD_OPTIONS, | |
| 1127 | FALSE, FALSE, "Group3Options" }, | |
| 1128 | }; | |
| 1129 | static const TIFFFieldInfo fax4FieldInfo[] = { | |
| 1130 | { TIFFTAG_GROUP4OPTIONS, 1, 1, TIFF_LONG, FIELD_OPTIONS, | |
| 1131 | FALSE, FALSE, "Group4Options" }, | |
| 1132 | }; | |
| 1133 | #define N(a) (sizeof (a) / sizeof (a[0])) | |
| 1134 | ||
| 1135 | static int | |
| 1136 | Fax3VSetField(TIFF* tif, ttag_t tag, va_list ap) | |
| 1137 | { | |
| 1138 | Fax3BaseState* sp = Fax3State(tif); | |
| 1139 | ||
| 1140 | assert(sp != 0); | |
| 1141 | assert(sp->vsetparent != 0); | |
| 1142 | ||
| 1143 | switch (tag) { | |
| 1144 | case TIFFTAG_FAXMODE: | |
| 1145 | sp->mode = va_arg(ap, int); | |
| 1146 | return (1); /* NB: pseudo tag */ | |
| 1147 | case TIFFTAG_FAXFILLFUNC: | |
| 1148 | DecoderState(tif)->fill = va_arg(ap, TIFFFaxFillFunc); | |
| 1149 | return (1); /* NB: pseudo tag */ | |
| 1150 | case TIFFTAG_GROUP3OPTIONS: | |
| 1151 | /* XXX: avoid reading options if compression mismatches. */ | |
| 1152 | if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX3) | |
| 1153 | sp->groupoptions = va_arg(ap, uint32); | |
| 1154 | break; | |
| 1155 | case TIFFTAG_GROUP4OPTIONS: | |
| 1156 | /* XXX: avoid reading options if compression mismatches. */ | |
| 1157 | if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4) | |
| 1158 | sp->groupoptions = va_arg(ap, uint32); | |
| 1159 | break; | |
| 1160 | case TIFFTAG_BADFAXLINES: | |
| 1161 | sp->badfaxlines = va_arg(ap, uint32); | |
| 1162 | break; | |
| 1163 | case TIFFTAG_CLEANFAXDATA: | |
| 1164 | sp->cleanfaxdata = (uint16) va_arg(ap, int); | |
| 1165 | break; | |
| 1166 | case TIFFTAG_CONSECUTIVEBADFAXLINES: | |
| 1167 | sp->badfaxrun = va_arg(ap, uint32); | |
| 1168 | break; | |
| 1169 | case TIFFTAG_FAXRECVPARAMS: | |
| 1170 | sp->recvparams = va_arg(ap, uint32); | |
| 1171 | break; | |
| 1172 | case TIFFTAG_FAXSUBADDRESS: | |
| 1173 | _TIFFsetString(&sp->subaddress, va_arg(ap, char*)); | |
| 1174 | break; | |
| 1175 | case TIFFTAG_FAXRECVTIME: | |
| 1176 | sp->recvtime = va_arg(ap, uint32); | |
| 1177 | break; | |
| 1178 | case TIFFTAG_FAXDCS: | |
| 1179 | _TIFFsetString(&sp->faxdcs, va_arg(ap, char*)); | |
| 1180 | break; | |
| 1181 | default: | |
| 1182 | return (*sp->vsetparent)(tif, tag, ap); | |
| 1183 | } | |
| 1184 | TIFFSetFieldBit(tif, _TIFFFieldWithTag(tif, tag)->field_bit); | |
| 1185 | tif->tif_flags |= TIFF_DIRTYDIRECT; | |
| 1186 | return (1); | |
| 1187 | } | |
| 1188 | ||
| 1189 | static int | |
| 1190 | Fax3VGetField(TIFF* tif, ttag_t tag, va_list ap) | |
| 1191 | { | |
| 1192 | Fax3BaseState* sp = Fax3State(tif); | |
| 1193 | ||
| 1194 | switch (tag) { | |
| 1195 | case TIFFTAG_FAXMODE: | |
| 1196 | *va_arg(ap, int*) = sp->mode; | |
| 1197 | break; | |
| 1198 | case TIFFTAG_FAXFILLFUNC: | |
| 1199 | *va_arg(ap, TIFFFaxFillFunc*) = DecoderState(tif)->fill; | |
| 1200 | break; | |
| 1201 | case TIFFTAG_GROUP3OPTIONS: | |
| 1202 | case TIFFTAG_GROUP4OPTIONS: | |
| 1203 | *va_arg(ap, uint32*) = sp->groupoptions; | |
| 1204 | break; | |
| 1205 | case TIFFTAG_BADFAXLINES: | |
| 1206 | *va_arg(ap, uint32*) = sp->badfaxlines; | |
| 1207 | break; | |
| 1208 | case TIFFTAG_CLEANFAXDATA: | |
| 1209 | *va_arg(ap, uint16*) = sp->cleanfaxdata; | |
| 1210 | break; | |
| 1211 | case TIFFTAG_CONSECUTIVEBADFAXLINES: | |
| 1212 | *va_arg(ap, uint32*) = sp->badfaxrun; | |
| 1213 | break; | |
| 1214 | case TIFFTAG_FAXRECVPARAMS: | |
| 1215 | *va_arg(ap, uint32*) = sp->recvparams; | |
| 1216 | break; | |
| 1217 | case TIFFTAG_FAXSUBADDRESS: | |
| 1218 | *va_arg(ap, char**) = sp->subaddress; | |
| 1219 | break; | |
| 1220 | case TIFFTAG_FAXRECVTIME: | |
| 1221 | *va_arg(ap, uint32*) = sp->recvtime; | |
| 1222 | break; | |
| 1223 | case TIFFTAG_FAXDCS: | |
| 1224 | *va_arg(ap, char**) = sp->faxdcs; | |
| 1225 | break; | |
| 1226 | default: | |
| 1227 | return (*sp->vgetparent)(tif, tag, ap); | |
| 1228 | } | |
| 1229 | return (1); | |
| 1230 | } | |
| 1231 | ||
| 1232 | static void | |
| 1233 | Fax3PrintDir(TIFF* tif, FILE* fd, long flags) | |
| 1234 | { | |
| 1235 | Fax3BaseState* sp = Fax3State(tif); | |
| 1236 | ||
| 1237 | (void) flags; | |
| 1238 | if (TIFFFieldSet(tif,FIELD_OPTIONS)) { | |
| 1239 | const char* sep = " "; | |
| 1240 | if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4) { | |
| 1241 | fprintf(fd, " Group 4 Options:"); | |
| 1242 | if (sp->groupoptions & GROUP4OPT_UNCOMPRESSED) | |
| 1243 | fprintf(fd, "%suncompressed data", sep); | |
| 1244 | } else { | |
| 1245 | ||
| 1246 | fprintf(fd, " Group 3 Options:"); | |
| 1247 | if (sp->groupoptions & GROUP3OPT_2DENCODING) | |
| 1248 | fprintf(fd, "%s2-d encoding", sep), sep = "+"; | |
| 1249 | if (sp->groupoptions & GROUP3OPT_FILLBITS) | |
| 1250 | fprintf(fd, "%sEOL padding", sep), sep = "+"; | |
| 1251 | if (sp->groupoptions & GROUP3OPT_UNCOMPRESSED) | |
| 1252 | fprintf(fd, "%suncompressed data", sep); | |
| 1253 | } | |
| 1254 | fprintf(fd, " (%lu = 0x%lx)\n", | |
| 1255 | (unsigned long) sp->groupoptions, | |
| 1256 | (unsigned long) sp->groupoptions); | |
| 1257 | } | |
| 1258 | if (TIFFFieldSet(tif,FIELD_CLEANFAXDATA)) { | |
| 1259 | fprintf(fd, " Fax Data:"); | |
| 1260 | switch (sp->cleanfaxdata) { | |
| 1261 | case CLEANFAXDATA_CLEAN: | |
| 1262 | fprintf(fd, " clean"); | |
| 1263 | break; | |
| 1264 | case CLEANFAXDATA_REGENERATED: | |
| 1265 | fprintf(fd, " receiver regenerated"); | |
| 1266 | break; | |
| 1267 | case CLEANFAXDATA_UNCLEAN: | |
| 1268 | fprintf(fd, " uncorrected errors"); | |
| 1269 | break; | |
| 1270 | } | |
| 1271 | fprintf(fd, " (%u = 0x%x)\n", | |
| 1272 | sp->cleanfaxdata, sp->cleanfaxdata); | |
| 1273 | } | |
| 1274 | if (TIFFFieldSet(tif,FIELD_BADFAXLINES)) | |
| 1275 | fprintf(fd, " Bad Fax Lines: %lu\n", | |
| 1276 | (unsigned long) sp->badfaxlines); | |
| 1277 | if (TIFFFieldSet(tif,FIELD_BADFAXRUN)) | |
| 1278 | fprintf(fd, " Consecutive Bad Fax Lines: %lu\n", | |
| 1279 | (unsigned long) sp->badfaxrun); | |
| 1280 | if (TIFFFieldSet(tif,FIELD_RECVPARAMS)) | |
| 1281 | fprintf(fd, " Fax Receive Parameters: %08lx\n", | |
| 1282 | (unsigned long) sp->recvparams); | |
| 1283 | if (TIFFFieldSet(tif,FIELD_SUBADDRESS)) | |
| 1284 | fprintf(fd, " Fax SubAddress: %s\n", sp->subaddress); | |
| 1285 | if (TIFFFieldSet(tif,FIELD_RECVTIME)) | |
| 1286 | fprintf(fd, " Fax Receive Time: %lu secs\n", | |
| 1287 | (unsigned long) sp->recvtime); | |
| 1288 | if (TIFFFieldSet(tif,FIELD_FAXDCS)) | |
| 1289 | fprintf(fd, " Fax DCS: %s\n", sp->faxdcs); | |
| 1290 | } | |
| 1291 | ||
| 1292 | static int | |
| 1293 | InitCCITTFax3(TIFF* tif) | |
| 1294 | { | |
| 1295 | Fax3BaseState* sp; | |
| 1296 | ||
| 1297 | /* | |
| 1298 | * Allocate state block so tag methods have storage to record values. | |
| 1299 | */ | |
| 1300 | tif->tif_data = (tidata_t) | |
| 1301 | _TIFFmalloc(sizeof (Fax3CodecState)); | |
| 1302 | ||
| 1303 | if (tif->tif_data == NULL) { | |
| 1304 | TIFFErrorExt(tif->tif_clientdata, "TIFFInitCCITTFax3", | |
| 1305 | "%s: No space for state block", tif->tif_name); | |
| 1306 | return (0); | |
| 1307 | } | |
| 1308 | ||
| 1309 | sp = Fax3State(tif); | |
| 1310 | sp->rw_mode = tif->tif_mode; | |
| 1311 | ||
| 1312 | /* | |
| 1313 | * Merge codec-specific tag information and | |
| 1314 | * override parent get/set field methods. | |
| 1315 | */ | |
| 1316 | _TIFFMergeFieldInfo(tif, faxFieldInfo, N(faxFieldInfo)); | |
| 1317 | sp->vgetparent = tif->tif_tagmethods.vgetfield; | |
| 1318 | tif->tif_tagmethods.vgetfield = Fax3VGetField; /* hook for codec tags */ | |
| 1319 | sp->vsetparent = tif->tif_tagmethods.vsetfield; | |
| 1320 | tif->tif_tagmethods.vsetfield = Fax3VSetField; /* hook for codec tags */ | |
| 1321 | tif->tif_tagmethods.printdir = Fax3PrintDir; /* hook for codec tags */ | |
| 1322 | sp->groupoptions = 0; | |
| 1323 | sp->recvparams = 0; | |
| 1324 | sp->subaddress = NULL; | |
| 1325 | sp->faxdcs = NULL; | |
| 1326 | ||
| 1327 | if (sp->rw_mode == O_RDONLY) /* FIXME: improve for in place update */ | |
| 1328 | tif->tif_flags |= TIFF_NOBITREV; /* decoder does bit reversal */ | |
| 1329 | DecoderState(tif)->runs = NULL; | |
| 1330 | TIFFSetField(tif, TIFFTAG_FAXFILLFUNC, _TIFFFax3fillruns); | |
| 1331 | EncoderState(tif)->refline = NULL; | |
| 1332 | ||
| 1333 | /* | |
| 1334 | * Install codec methods. | |
| 1335 | */ | |
| 1336 | tif->tif_setupdecode = Fax3SetupState; | |
| 1337 | tif->tif_predecode = Fax3PreDecode; | |
| 1338 | tif->tif_decoderow = Fax3Decode1D; | |
| 1339 | tif->tif_decodestrip = Fax3Decode1D; | |
| 1340 | tif->tif_decodetile = Fax3Decode1D; | |
| 1341 | tif->tif_setupencode = Fax3SetupState; | |
| 1342 | tif->tif_preencode = Fax3PreEncode; | |
| 1343 | tif->tif_postencode = Fax3PostEncode; | |
| 1344 | tif->tif_encoderow = Fax3Encode; | |
| 1345 | tif->tif_encodestrip = Fax3Encode; | |
| 1346 | tif->tif_encodetile = Fax3Encode; | |
| 1347 | tif->tif_close = Fax3Close; | |
| 1348 | tif->tif_cleanup = Fax3Cleanup; | |
| 1349 | ||
| 1350 | return (1); | |
| 1351 | } | |
| 1352 | ||
| 1353 | int | |
| 1354 | TIFFInitCCITTFax3(TIFF* tif, int scheme) | |
| 1355 | { | |
| 1356 | (void) scheme; | |
| 1357 | if (InitCCITTFax3(tif)) { | |
| 1358 | _TIFFMergeFieldInfo(tif, fax3FieldInfo, N(fax3FieldInfo)); | |
| 1359 | ||
| 1360 | /* | |
| 1361 | * The default format is Class/F-style w/o RTC. | |
| 1362 | */ | |
| 1363 | return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_CLASSF); | |
| 1364 | } else | |
| 1365 | return (0); | |
| 1366 | } | |
| 1367 | ||
| 1368 | /* | |
| 1369 | * CCITT Group 4 (T.6) Facsimile-compatible | |
| 1370 | * Compression Scheme Support. | |
| 1371 | */ | |
| 1372 | ||
| 1373 | #define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; } | |
| 1374 | /* | |
| 1375 | * Decode the requested amount of G4-encoded data. | |
| 1376 | */ | |
| 1377 | static int | |
| 1378 | Fax4Decode(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s) | |
| 1379 | { | |
| 1380 | DECLARE_STATE_2D(tif, sp, "Fax4Decode"); | |
| 1381 | int line = 0; | |
| 1382 | ||
| 1383 | (void) s; | |
| 1384 | CACHE_STATE(tif, sp); | |
| 1385 | while ((long)occ > 0) { | |
| 1386 | a0 = 0; | |
| 1387 | RunLength = 0; | |
| 1388 | pa = thisrun = sp->curruns; | |
| 1389 | pb = sp->refruns; | |
| 1390 | b1 = *pb++; | |
| 1391 | #ifdef FAX3_DEBUG | |
| 1392 | printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail); | |
| 1393 | printf("-------------------- %d\n", tif->tif_row); | |
| 1394 | fflush(stdout); | |
| 1395 | #endif | |
| 1396 | EXPAND2D(EOFG4); | |
| 1397 | if (EOLcnt) | |
| 1398 | goto EOFG4; | |
| 1399 | (*sp->fill)(buf, thisrun, pa, lastx); | |
| 1400 | SETVALUE(0); /* imaginary change for reference */ | |
| 1401 | SWAP(uint32*, sp->curruns, sp->refruns); | |
| 1402 | buf += sp->b.rowbytes; | |
| 1403 | occ -= sp->b.rowbytes; | |
| 1404 | line++; | |
| 1405 | continue; | |
| 1406 | EOFG4: | |
| 1407 | NeedBits16( 13, BADG4 ); | |
| 1408 | BADG4: | |
| 1409 | #ifdef FAX3_DEBUG | |
| 1410 | if( GetBits(13) != 0x1001 ) | |
| 1411 | fputs( "Bad RTC\n", stderr ); | |
| 1412 | #endif | |
| 1413 | ClrBits( 13 ); | |
| 1414 | (*sp->fill)(buf, thisrun, pa, lastx); | |
| 1415 | UNCACHE_STATE(tif, sp); | |
| 1416 | return (-1); | |
| 1417 | } | |
| 1418 | UNCACHE_STATE(tif, sp); | |
| 1419 | return (1); | |
| 1420 | } | |
| 1421 | #undef SWAP | |
| 1422 | ||
| 1423 | /* | |
| 1424 | * Encode the requested amount of data. | |
| 1425 | */ | |
| 1426 | static int | |
| 1427 | Fax4Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s) | |
| 1428 | { | |
| 1429 | Fax3CodecState *sp = EncoderState(tif); | |
| 1430 | ||
| 1431 | (void) s; | |
| 1432 | while ((long)cc > 0) { | |
| 1433 | if (!Fax3Encode2DRow(tif, bp, sp->refline, sp->b.rowpixels)) | |
| 1434 | return (0); | |
| 1435 | _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes); | |
| 1436 | bp += sp->b.rowbytes; | |
| 1437 | cc -= sp->b.rowbytes; | |
| 1438 | } | |
| 1439 | return (1); | |
| 1440 | } | |
| 1441 | ||
| 1442 | static int | |
| 1443 | Fax4PostEncode(TIFF* tif) | |
| 1444 | { | |
| 1445 | Fax3CodecState *sp = EncoderState(tif); | |
| 1446 | ||
| 1447 | /* terminate strip w/ EOFB */ | |
| 1448 | Fax3PutBits(tif, EOL, 12); | |
| 1449 | Fax3PutBits(tif, EOL, 12); | |
| 1450 | if (sp->bit != 8) | |
| 1451 | Fax3FlushBits(tif, sp); | |
| 1452 | return (1); | |
| 1453 | } | |
| 1454 | ||
| 1455 | int | |
| 1456 | TIFFInitCCITTFax4(TIFF* tif, int scheme) | |
| 1457 | { | |
| 1458 | (void) scheme; | |
| 1459 | if (InitCCITTFax3(tif)) { /* reuse G3 support */ | |
| 1460 | _TIFFMergeFieldInfo(tif, fax4FieldInfo, N(fax4FieldInfo)); | |
| 1461 | ||
| 1462 | tif->tif_decoderow = Fax4Decode; | |
| 1463 | tif->tif_decodestrip = Fax4Decode; | |
| 1464 | tif->tif_decodetile = Fax4Decode; | |
| 1465 | tif->tif_encoderow = Fax4Encode; | |
| 1466 | tif->tif_encodestrip = Fax4Encode; | |
| 1467 | tif->tif_encodetile = Fax4Encode; | |
| 1468 | tif->tif_postencode = Fax4PostEncode; | |
| 1469 | /* | |
| 1470 | * Suppress RTC at the end of each strip. | |
| 1471 | */ | |
| 1472 | return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_NORTC); | |
| 1473 | } else | |
| 1474 | return (0); | |
| 1475 | } | |
| 1476 | ||
| 1477 | /* | |
| 1478 | * CCITT Group 3 1-D Modified Huffman RLE Compression Support. | |
| 1479 | * (Compression algorithms 2 and 32771) | |
| 1480 | */ | |
| 1481 | ||
| 1482 | /* | |
| 1483 | * Decode the requested amount of RLE-encoded data. | |
| 1484 | */ | |
| 1485 | static int | |
| 1486 | Fax3DecodeRLE(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s) | |
| 1487 | { | |
| 1488 | DECLARE_STATE(tif, sp, "Fax3DecodeRLE"); | |
| 1489 | int mode = sp->b.mode; | |
| 1490 | int line = 0; | |
| 1491 | ||
| 1492 | (void) s; | |
| 1493 | CACHE_STATE(tif, sp); | |
| 1494 | thisrun = sp->curruns; | |
| 1495 | while ((long)occ > 0) { | |
| 1496 | a0 = 0; | |
| 1497 | RunLength = 0; | |
| 1498 | pa = thisrun; | |
| 1499 | #ifdef FAX3_DEBUG | |
| 1500 | printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail); | |
| 1501 | printf("-------------------- %d\n", tif->tif_row); | |
| 1502 | fflush(stdout); | |
| 1503 | #endif | |
| 1504 | EXPAND1D(EOFRLE); | |
| 1505 | (*sp->fill)(buf, thisrun, pa, lastx); | |
| 1506 | /* | |
| 1507 | * Cleanup at the end of the row. | |
| 1508 | */ | |
| 1509 | if (mode & FAXMODE_BYTEALIGN) { | |
| 1510 | int n = BitsAvail - (BitsAvail &~ 7); | |
| 1511 | ClrBits(n); | |
| 1512 | } else if (mode & FAXMODE_WORDALIGN) { | |
| 1513 | int n = BitsAvail - (BitsAvail &~ 15); | |
| 1514 | ClrBits(n); | |
| 1515 | if (BitsAvail == 0 && !isAligned(cp, uint16)) | |
| 1516 | cp++; | |
| 1517 | } | |
| 1518 | buf += sp->b.rowbytes; | |
| 1519 | occ -= sp->b.rowbytes; | |
| 1520 | line++; | |
| 1521 | continue; | |
| 1522 | EOFRLE: /* premature EOF */ | |
| 1523 | (*sp->fill)(buf, thisrun, pa, lastx); | |
| 1524 | UNCACHE_STATE(tif, sp); | |
| 1525 | return (-1); | |
| 1526 | } | |
| 1527 | UNCACHE_STATE(tif, sp); | |
| 1528 | return (1); | |
| 1529 | } | |
| 1530 | ||
| 1531 | int | |
| 1532 | TIFFInitCCITTRLE(TIFF* tif, int scheme) | |
| 1533 | { | |
| 1534 | (void) scheme; | |
| 1535 | if (InitCCITTFax3(tif)) { /* reuse G3 support */ | |
| 1536 | tif->tif_decoderow = Fax3DecodeRLE; | |
| 1537 | tif->tif_decodestrip = Fax3DecodeRLE; | |
| 1538 | tif->tif_decodetile = Fax3DecodeRLE; | |
| 1539 | /* | |
| 1540 | * Suppress RTC+EOLs when encoding and byte-align data. | |
| 1541 | */ | |
| 1542 | return TIFFSetField(tif, TIFFTAG_FAXMODE, | |
| 1543 | FAXMODE_NORTC|FAXMODE_NOEOL|FAXMODE_BYTEALIGN); | |
| 1544 | } else | |
| 1545 | return (0); | |
| 1546 | } | |
| 1547 | ||
| 1548 | int | |
| 1549 | TIFFInitCCITTRLEW(TIFF* tif, int scheme) | |
| 1550 | { | |
| 1551 | (void) scheme; | |
| 1552 | if (InitCCITTFax3(tif)) { /* reuse G3 support */ | |
| 1553 | tif->tif_decoderow = Fax3DecodeRLE; | |
| 1554 | tif->tif_decodestrip = Fax3DecodeRLE; | |
| 1555 | tif->tif_decodetile = Fax3DecodeRLE; | |
| 1556 | /* | |
| 1557 | * Suppress RTC+EOLs when encoding and word-align data. | |
| 1558 | */ | |
| 1559 | return TIFFSetField(tif, TIFFTAG_FAXMODE, | |
| 1560 | FAXMODE_NORTC|FAXMODE_NOEOL|FAXMODE_WORDALIGN); | |
| 1561 | } else | |
| 1562 | return (0); | |
| 1563 | } | |
| 1564 | #endif /* CCITT_SUPPORT */ | |
| 1565 | ||
| 1566 | /* vim: set ts=8 sts=8 sw=8 noet: */ |