| | 1 | /* $Header$ */ |
| | 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 <assert.h> |
| | 45 | #include <stdio.h> |
| | 46 | |
| | 47 | /* |
| | 48 | * Compression+decompression state blocks are |
| | 49 | * derived from this ``base state'' block. |
| | 50 | */ |
| | 51 | typedef struct { |
| | 52 | int rw_mode; /* O_RDONLY for decode, else encode */ |
| | 53 | int mode; /* operating mode */ |
| | 54 | uint32 rowbytes; /* bytes in a decoded scanline */ |
| | 55 | uint32 rowpixels; /* pixels in a scanline */ |
| | 56 | |
| | 57 | uint16 cleanfaxdata; /* CleanFaxData tag */ |
| | 58 | uint32 badfaxrun; /* BadFaxRun tag */ |
| | 59 | uint32 badfaxlines; /* BadFaxLines tag */ |
| | 60 | uint32 groupoptions; /* Group 3/4 options tag */ |
| | 61 | uint32 recvparams; /* encoded Class 2 session params */ |
| | 62 | char* subaddress; /* subaddress string */ |
| | 63 | uint32 recvtime; /* time spent receiving (secs) */ |
| | 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 u_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 | u_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) ((((u_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 | u_char* cp; /* next byte of input data */ \ |
| | 113 | u_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 u_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 a0) |
| | 181 | { |
| | 182 | TIFFError(module, "%s: Bad code word at scanline %d (x %lu)", |
| | 183 | tif->tif_name, tif->tif_row, (u_long) a0); |
| | 184 | } |
| | 185 | #define unexpected(table, a0) Fax3Unexpected(module, tif, a0) |
| | 186 | |
| | 187 | static void |
| | 188 | Fax3Extension(const char* module, TIFF* tif, uint32 a0) |
| | 189 | { |
| | 190 | TIFFError(module, |
| | 191 | "%s: Uncompressed data (not supported) at scanline %d (x %lu)", |
| | 192 | tif->tif_name, tif->tif_row, (u_long) a0); |
| | 193 | } |
| | 194 | #define extension(a0) Fax3Extension(module, tif, a0) |
| | 195 | |
| | 196 | static void |
| | 197 | Fax3BadLength(const char* module, TIFF* tif, uint32 a0, uint32 lastx) |
| | 198 | { |
| | 199 | TIFFWarning(module, "%s: %s at scanline %d (got %lu, expected %lu)", |
| | 200 | tif->tif_name, |
| | 201 | a0 < lastx ? "Premature EOL" : "Line length mismatch", |
| | 202 | tif->tif_row, (u_long) a0, (u_long) lastx); |
| | 203 | } |
| | 204 | #define badlength(a0,lastx) Fax3BadLength(module, tif, a0, lastx) |
| | 205 | |
| | 206 | static void |
| | 207 | Fax3PrematureEOF(const char* module, TIFF* tif, uint32 a0) |
| | 208 | { |
| | 209 | TIFFWarning(module, "%s: Premature EOF at scanline %d (x %lu)", |
| | 210 | tif->tif_name, tif->tif_row, (u_long) a0); |
| | 211 | } |
| | 212 | #define prematureEOF(a0) Fax3PrematureEOF(module, tif, a0) |
| | 213 | |
| | 214 | #define Nop |
| | 215 | |
| | 216 | /* |
| | 217 | * Decode the requested amount of G3 1D-encoded data. |
| | 218 | */ |
| | 219 | static int |
| | 220 | Fax3Decode1D(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s) |
| | 221 | { |
| | 222 | DECLARE_STATE(tif, sp, "Fax3Decode1D"); |
| | 223 | |
| | 224 | (void) s; |
| | 225 | CACHE_STATE(tif, sp); |
| | 226 | thisrun = sp->curruns; |
| | 227 | while ((long)occ > 0) { |
| | 228 | a0 = 0; |
| | 229 | RunLength = 0; |
| | 230 | pa = thisrun; |
| | 231 | #ifdef FAX3_DEBUG |
| | 232 | printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail); |
| | 233 | printf("-------------------- %d\n", tif->tif_row); |
| | 234 | fflush(stdout); |
| | 235 | #endif |
| | 236 | SYNC_EOL(EOF1D); |
| | 237 | EXPAND1D(EOF1Da); |
| | 238 | (*sp->fill)(buf, thisrun, pa, lastx); |
| | 239 | buf += sp->b.rowbytes; |
| | 240 | occ -= sp->b.rowbytes; |
| | 241 | continue; |
| | 242 | EOF1D: /* premature EOF */ |
| | 243 | CLEANUP_RUNS(); |
| | 244 | EOF1Da: /* premature EOF */ |
| | 245 | (*sp->fill)(buf, thisrun, pa, lastx); |
| | 246 | UNCACHE_STATE(tif, sp); |
| | 247 | return (-1); |
| | 248 | } |
| | 249 | UNCACHE_STATE(tif, sp); |
| | 250 | return (1); |
| | 251 | } |
| | 252 | |
| | 253 | #define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; } |
| | 254 | /* |
| | 255 | * Decode the requested amount of G3 2D-encoded data. |
| | 256 | */ |
| | 257 | static int |
| | 258 | Fax3Decode2D(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s) |
| | 259 | { |
| | 260 | DECLARE_STATE_2D(tif, sp, "Fax3Decode2D"); |
| | 261 | int is1D; /* current line is 1d/2d-encoded */ |
| | 262 | |
| | 263 | (void) s; |
| | 264 | CACHE_STATE(tif, sp); |
| | 265 | while ((long)occ > 0) { |
| | 266 | a0 = 0; |
| | 267 | RunLength = 0; |
| | 268 | pa = thisrun = sp->curruns; |
| | 269 | #ifdef FAX3_DEBUG |
| | 270 | printf("\nBitAcc=%08X, BitsAvail = %d EOLcnt = %d", |
| | 271 | BitAcc, BitsAvail, EOLcnt); |
| | 272 | #endif |
| | 273 | SYNC_EOL(EOF2D); |
| | 274 | NeedBits8(1, EOF2D); |
| | 275 | is1D = GetBits(1); /* 1D/2D-encoding tag bit */ |
| | 276 | ClrBits(1); |
| | 277 | #ifdef FAX3_DEBUG |
| | 278 | printf(" %s\n-------------------- %d\n", |
| | 279 | is1D ? "1D" : "2D", tif->tif_row); |
| | 280 | fflush(stdout); |
| | 281 | #endif |
| | 282 | pb = sp->refruns; |
| | 283 | b1 = *pb++; |
| | 284 | if (is1D) |
| | 285 | EXPAND1D(EOF2Da); |
| | 286 | else |
| | 287 | EXPAND2D(EOF2Da); |
| | 288 | (*sp->fill)(buf, thisrun, pa, lastx); |
| | 289 | SETVAL(0); /* imaginary change for reference */ |
| | 290 | SWAP(uint32*, sp->curruns, sp->refruns); |
| | 291 | buf += sp->b.rowbytes; |
| | 292 | occ -= sp->b.rowbytes; |
| | 293 | continue; |
| | 294 | EOF2D: /* premature EOF */ |
| | 295 | CLEANUP_RUNS(); |
| | 296 | EOF2Da: /* premature EOF */ |
| | 297 | (*sp->fill)(buf, thisrun, pa, lastx); |
| | 298 | UNCACHE_STATE(tif, sp); |
| | 299 | return (-1); |
| | 300 | } |
| | 301 | UNCACHE_STATE(tif, sp); |
| | 302 | return (1); |
| | 303 | } |
| | 304 | #undef SWAP |
| | 305 | |
| | 306 | /* |
| | 307 | * The ZERO & FILL macros must handle spans < 2*sizeof(long) bytes. |
| | 308 | * For machines with 64-bit longs this is <16 bytes; otherwise |
| | 309 | * this is <8 bytes. We optimize the code here to reflect the |
| | 310 | * machine characteristics. |
| | 311 | */ |
| | 312 | #if defined(__alpha) || (defined(_MIPS_SZLONG) && _MIPS_SZLONG == 64) || defined(__LP64__) || defined(__arch64__) |
| | 313 | #define FILL(n, cp) \ |
| | 314 | switch (n) { \ |
| | 315 | case 15:(cp)[14] = 0xff; case 14:(cp)[13] = 0xff; case 13: (cp)[12] = 0xff;\ |
| | 316 | case 12:(cp)[11] = 0xff; case 11:(cp)[10] = 0xff; case 10: (cp)[9] = 0xff;\ |
| | 317 | case 9: (cp)[8] = 0xff; case 8: (cp)[7] = 0xff; case 7: (cp)[6] = 0xff;\ |
| | 318 | case 6: (cp)[5] = 0xff; case 5: (cp)[4] = 0xff; case 4: (cp)[3] = 0xff;\ |
| | 319 | case 3: (cp)[2] = 0xff; case 2: (cp)[1] = 0xff; \ |
| | 320 | case 1: (cp)[0] = 0xff; (cp) += (n); case 0: ; \ |
| | 321 | } |
| | 322 | #define ZERO(n, cp) \ |
| | 323 | switch (n) { \ |
| | 324 | case 15:(cp)[14] = 0; case 14:(cp)[13] = 0; case 13: (cp)[12] = 0; \ |
| | 325 | case 12:(cp)[11] = 0; case 11:(cp)[10] = 0; case 10: (cp)[9] = 0; \ |
| | 326 | case 9: (cp)[8] = 0; case 8: (cp)[7] = 0; case 7: (cp)[6] = 0; \ |
| | 327 | case 6: (cp)[5] = 0; case 5: (cp)[4] = 0; case 4: (cp)[3] = 0; \ |
| | 328 | case 3: (cp)[2] = 0; case 2: (cp)[1] = 0; \ |
| | 329 | case 1: (cp)[0] = 0; (cp) += (n); case 0: ; \ |
| | 330 | } |
| | 331 | #else |
| | 332 | #define FILL(n, cp) \ |
| | 333 | switch (n) { \ |
| | 334 | case 7: (cp)[6] = 0xff; case 6: (cp)[5] = 0xff; case 5: (cp)[4] = 0xff; \ |
| | 335 | case 4: (cp)[3] = 0xff; case 3: (cp)[2] = 0xff; case 2: (cp)[1] = 0xff; \ |
| | 336 | case 1: (cp)[0] = 0xff; (cp) += (n); case 0: ; \ |
| | 337 | } |
| | 338 | #define ZERO(n, cp) \ |
| | 339 | switch (n) { \ |
| | 340 | case 7: (cp)[6] = 0; case 6: (cp)[5] = 0; case 5: (cp)[4] = 0; \ |
| | 341 | case 4: (cp)[3] = 0; case 3: (cp)[2] = 0; case 2: (cp)[1] = 0; \ |
| | 342 | case 1: (cp)[0] = 0; (cp) += (n); case 0: ; \ |
| | 343 | } |
| | 344 | #endif |
| | 345 | |
| | 346 | /* |
| | 347 | * Bit-fill a row according to the white/black |
| | 348 | * runs generated during G3/G4 decoding. |
| | 349 | */ |
| | 350 | void |
| | 351 | _TIFFFax3fillruns(u_char* buf, uint32* runs, uint32* erun, uint32 lastx) |
| | 352 | { |
| | 353 | static const unsigned char _fillmasks[] = |
| | 354 | { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff }; |
| | 355 | u_char* cp; |
| | 356 | uint32 x, bx, run; |
| | 357 | int32 n, nw; |
| | 358 | long* lp; |
| | 359 | |
| | 360 | if ((erun-runs)&1) |
| | 361 | *erun++ = 0; |
| | 362 | x = 0; |
| | 363 | for (; runs < erun; runs += 2) { |
| | 364 | run = runs[0]; |
| | 365 | if (x+run > lastx || run > lastx ) |
| | 366 | run = runs[0] = (uint32) (lastx - x); |
| | 367 | if (run) { |
| | 368 | cp = buf + (x>>3); |
| | 369 | bx = x&7; |
| | 370 | if (run > 8-bx) { |
| | 371 | if (bx) { /* align to byte boundary */ |
| | 372 | *cp++ &= 0xff << (8-bx); |
| | 373 | run -= 8-bx; |
| | 374 | } |
| | 375 | if( (n = run >> 3) != 0 ) { /* multiple bytes to fill */ |
| | 376 | if ((n/sizeof (long)) > 1) { |
| | 377 | /* |
| | 378 | * Align to longword boundary and fill. |
| | 379 | */ |
| | 380 | for (; n && !isAligned(cp, long); n--) |
| | 381 | *cp++ = 0x00; |
| | 382 | lp = (long*) cp; |
| | 383 | nw = (int32)(n / sizeof (long)); |
| | 384 | n -= nw * sizeof (long); |
| | 385 | do { |
| | 386 | *lp++ = 0L; |
| | 387 | } while (--nw); |
| | 388 | cp = (u_char*) lp; |
| | 389 | } |
| | 390 | ZERO(n, cp); |
| | 391 | run &= 7; |
| | 392 | } |
| | 393 | if (run) |
| | 394 | cp[0] &= 0xff >> run; |
| | 395 | } else |
| | 396 | cp[0] &= ~(_fillmasks[run]>>bx); |
| | 397 | x += runs[0]; |
| | 398 | } |
| | 399 | run = runs[1]; |
| | 400 | if (x+run > lastx || run > lastx ) |
| | 401 | run = runs[1] = lastx - x; |
| | 402 | if (run) { |
| | 403 | cp = buf + (x>>3); |
| | 404 | bx = x&7; |
| | 405 | if (run > 8-bx) { |
| | 406 | if (bx) { /* align to byte boundary */ |
| | 407 | *cp++ |= 0xff >> bx; |
| | 408 | run -= 8-bx; |
| | 409 | } |
| | 410 | if( (n = run>>3) != 0 ) { /* multiple bytes to fill */ |
| | 411 | if ((n/sizeof (long)) > 1) { |
| | 412 | /* |
| | 413 | * Align to longword boundary and fill. |
| | 414 | */ |
| | 415 | for (; n && !isAligned(cp, long); n--) |
| | 416 | *cp++ = 0xff; |
| | 417 | lp = (long*) cp; |
| | 418 | nw = (int32)(n / sizeof (long)); |
| | 419 | n -= nw * sizeof (long); |
| | 420 | do { |
| | 421 | *lp++ = -1L; |
| | 422 | } while (--nw); |
| | 423 | cp = (u_char*) lp; |
| | 424 | } |
| | 425 | FILL(n, cp); |
| | 426 | run &= 7; |
| | 427 | } |
| | 428 | if (run) |
| | 429 | cp[0] |= 0xff00 >> run; |
| | 430 | } else |
| | 431 | cp[0] |= _fillmasks[run]>>bx; |
| | 432 | x += runs[1]; |
| | 433 | } |
| | 434 | } |
| | 435 | assert(x == lastx); |
| | 436 | } |
| | 437 | #undef ZERO |
| | 438 | #undef FILL |
| | 439 | |
| | 440 | static char * |
| | 441 | CheckMalloc(TIFF* tif, size_t nmemb, size_t elem_size, const char* what) |
| | 442 | { |
| | 443 | char *cp = NULL; |
| | 444 | tsize_t bytes = nmemb * elem_size; |
| | 445 | |
| | 446 | if (nmemb && elem_size && bytes / elem_size == nmemb) |
| | 447 | cp = (char*) _TIFFmalloc(bytes); |
| | 448 | |
| | 449 | if (cp == NULL) |
| | 450 | TIFFError(tif->tif_name, "No space %s", what); |
| | 451 | |
| | 452 | return (cp); |
| | 453 | } |
| | 454 | |
| | 455 | /* |
| | 456 | * Setup G3/G4-related compression/decompression state |
| | 457 | * before data is processed. This routine is called once |
| | 458 | * per image -- it sets up different state based on whether |
| | 459 | * or not decoding or encoding is being done and whether |
| | 460 | * 1D- or 2D-encoded data is involved. |
| | 461 | */ |
| | 462 | static int |
| | 463 | Fax3SetupState(TIFF* tif) |
| | 464 | { |
| | 465 | TIFFDirectory* td = &tif->tif_dir; |
| | 466 | Fax3BaseState* sp = Fax3State(tif); |
| | 467 | long rowbytes, rowpixels; |
| | 468 | int needsRefLine; |
| | 469 | Fax3CodecState* dsp = DecoderState(tif); |
| | 470 | uint32 nruns; |
| | 471 | |
| | 472 | if (td->td_bitspersample != 1) { |
| | 473 | TIFFError(tif->tif_name, |
| | 474 | "Bits/sample must be 1 for Group 3/4 encoding/decoding"); |
| | 475 | return (0); |
| | 476 | } |
| | 477 | /* |
| | 478 | * Calculate the scanline/tile widths. |
| | 479 | */ |
| | 480 | if (isTiled(tif)) { |
| | 481 | rowbytes = TIFFTileRowSize(tif); |
| | 482 | rowpixels = td->td_tilewidth; |
| | 483 | } else { |
| | 484 | rowbytes = TIFFScanlineSize(tif); |
| | 485 | rowpixels = td->td_imagewidth; |
| | 486 | } |
| | 487 | sp->rowbytes = (uint32) rowbytes; |
| | 488 | sp->rowpixels = (uint32) rowpixels; |
| | 489 | /* |
| | 490 | * Allocate any additional space required for decoding/encoding. |
| | 491 | */ |
| | 492 | needsRefLine = ( |
| | 493 | (sp->groupoptions & GROUP3OPT_2DENCODING) || |
| | 494 | td->td_compression == COMPRESSION_CCITTFAX4 |
| | 495 | ); |
| | 496 | |
| | 497 | nruns = needsRefLine ? 2*TIFFroundup(rowpixels,32) : rowpixels; |
| | 498 | |
| | 499 | dsp->runs = (uint32*) CheckMalloc(tif, 2*nruns+3, sizeof (uint32), |
| | 500 | "for Group 3/4 run arrays"); |
| | 501 | if (dsp->runs == NULL) |
| | 502 | return (0); |
| | 503 | dsp->curruns = dsp->runs; |
| | 504 | if (needsRefLine) |
| | 505 | dsp->refruns = dsp->runs + (nruns>>1); |
| | 506 | else |
| | 507 | dsp->refruns = NULL; |
| | 508 | if (is2DEncoding(dsp)) { /* NB: default is 1D routine */ |
| | 509 | tif->tif_decoderow = Fax3Decode2D; |
| | 510 | tif->tif_decodestrip = Fax3Decode2D; |
| | 511 | tif->tif_decodetile = Fax3Decode2D; |
| | 512 | } |
| | 513 | |
| | 514 | if (needsRefLine) { /* 2d encoding */ |
| | 515 | Fax3CodecState* esp = EncoderState(tif); |
| | 516 | /* |
| | 517 | * 2d encoding requires a scanline |
| | 518 | * buffer for the ``reference line''; the |
| | 519 | * scanline against which delta encoding |
| | 520 | * is referenced. The reference line must |
| | 521 | * be initialized to be ``white'' (done elsewhere). |
| | 522 | */ |
| | 523 | esp->refline = (u_char*) _TIFFmalloc(rowbytes); |
| | 524 | if (esp->refline == NULL) { |
| | 525 | TIFFError("Fax3SetupState", |
| | 526 | "%s: No space for Group 3/4 reference line", |
| | 527 | tif->tif_name); |
| | 528 | return (0); |
| | 529 | } |
| | 530 | } else /* 1d encoding */ |
| | 531 | EncoderState(tif)->refline = NULL; |
| | 532 | return (1); |
| | 533 | } |
| | 534 | |
| | 535 | /* |
| | 536 | * CCITT Group 3 FAX Encoding. |
| | 537 | */ |
| | 538 | |
| | 539 | #define Fax3FlushBits(tif, sp) { \ |
| | 540 | if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \ |
| | 541 | (void) TIFFFlushData1(tif); \ |
| | 542 | *(tif)->tif_rawcp++ = (tidataval_t) (sp)->data; \ |
| | 543 | (tif)->tif_rawcc++; \ |
| | 544 | (sp)->data = 0, (sp)->bit = 8; \ |
| | 545 | } |
| | 546 | #define _FlushBits(tif) { \ |
| | 547 | if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \ |
| | 548 | (void) TIFFFlushData1(tif); \ |
| | 549 | *(tif)->tif_rawcp++ = (tidataval_t) data; \ |
| | 550 | (tif)->tif_rawcc++; \ |
| | 551 | data = 0, bit = 8; \ |
| | 552 | } |
| | 553 | static const int _msbmask[9] = |
| | 554 | { 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff }; |
| | 555 | #define _PutBits(tif, bits, length) { \ |
| | 556 | while (length > bit) { \ |
| | 557 | data |= bits >> (length - bit); \ |
| | 558 | length -= bit; \ |
| | 559 | _FlushBits(tif); \ |
| | 560 | } \ |
| | 561 | data |= (bits & _msbmask[length]) << (bit - length); \ |
| | 562 | bit -= length; \ |
| | 563 | if (bit == 0) \ |
| | 564 | _FlushBits(tif); \ |
| | 565 | } |
| | 566 | |
| | 567 | /* |
| | 568 | * Write a variable-length bit-value to |
| | 569 | * the output stream. Values are |
| | 570 | * assumed to be at most 16 bits. |
| | 571 | */ |
| | 572 | static void |
| | 573 | Fax3PutBits(TIFF* tif, u_int bits, u_int length) |
| | 574 | { |
| | 575 | Fax3CodecState* sp = EncoderState(tif); |
| | 576 | u_int bit = sp->bit; |
| | 577 | int data = sp->data; |
| | 578 | |
| | 579 | _PutBits(tif, bits, length); |
| | 580 | |
| | 581 | sp->data = data; |
| | 582 | sp->bit = bit; |
| | 583 | } |
| | 584 | |
| | 585 | /* |
| | 586 | * Write a code to the output stream. |
| | 587 | */ |
| | 588 | #define putcode(tif, te) Fax3PutBits(tif, (te)->code, (te)->length) |
| | 589 | |
| | 590 | #ifdef FAX3_DEBUG |
| | 591 | #define DEBUG_COLOR(w) (tab == TIFFFaxWhiteCodes ? w "W" : w "B") |
| | 592 | #define DEBUG_PRINT(what,len) { \ |
| | 593 | int t; \ |
| | 594 | printf("%08X/%-2d: %s%5d\t", data, bit, DEBUG_COLOR(what), len); \ |
| | 595 | for (t = length-1; t >= 0; t--) \ |
| | 596 | putchar(code & (1<<t) ? '1' : '0'); \ |
| | 597 | putchar('\n'); \ |
| | 598 | } |
| | 599 | #endif |
| | 600 | |
| | 601 | /* |
| | 602 | * Write the sequence of codes that describes |
| | 603 | * the specified span of zero's or one's. The |
| | 604 | * appropriate table that holds the make-up and |
| | 605 | * terminating codes is supplied. |
| | 606 | */ |
| | 607 | static void |
| | 608 | putspan(TIFF* tif, int32 span, const tableentry* tab) |
| | 609 | { |
| | 610 | Fax3CodecState* sp = EncoderState(tif); |
| | 611 | u_int bit = sp->bit; |
| | 612 | int data = sp->data; |
| | 613 | u_int code, length; |
| | 614 | |
| | 615 | while (span >= 2624) { |
| | 616 | const tableentry* te = &tab[63 + (2560>>6)]; |
| | 617 | code = te->code, length = te->length; |
| | 618 | #ifdef FAX3_DEBUG |
| | 619 | DEBUG_PRINT("MakeUp", te->runlen); |
| | 620 | #endif |
| | 621 | _PutBits(tif, code, length); |
| | 622 | span -= te->runlen; |
| | 623 | } |
| | 624 | if (span >= 64) { |
| | 625 | const tableentry* te = &tab[63 + (span>>6)]; |
| | 626 | assert(te->runlen == 64*(span>>6)); |
| | 627 | code = te->code, length = te->length; |
| | 628 | #ifdef FAX3_DEBUG |
| | 629 | DEBUG_PRINT("MakeUp", te->runlen); |
| | 630 | #endif |
| | 631 | _PutBits(tif, code, length); |
| | 632 | span -= te->runlen; |
| | 633 | } |
| | 634 | code = tab[span].code, length = tab[span].length; |
| | 635 | #ifdef FAX3_DEBUG |
| | 636 | DEBUG_PRINT(" Term", tab[span].runlen); |
| | 637 | #endif |
| | 638 | _PutBits(tif, code, length); |
| | 639 | |
| | 640 | sp->data = data; |
| | 641 | sp->bit = bit; |
| | 642 | } |
| | 643 | |
| | 644 | /* |
| | 645 | * Write an EOL code to the output stream. The zero-fill |
| | 646 | * logic for byte-aligning encoded scanlines is handled |
| | 647 | * here. We also handle writing the tag bit for the next |
| | 648 | * scanline when doing 2d encoding. |
| | 649 | */ |
| | 650 | static void |
| | 651 | Fax3PutEOL(TIFF* tif) |
| | 652 | { |
| | 653 | Fax3CodecState* sp = EncoderState(tif); |
| | 654 | u_int bit = sp->bit; |
| | 655 | int data = sp->data; |
| | 656 | u_int code, length, tparm; |
| | 657 | |
| | 658 | if (sp->b.groupoptions & GROUP3OPT_FILLBITS) { |
| | 659 | /* |
| | 660 | * Force bit alignment so EOL will terminate on |
| | 661 | * a byte boundary. That is, force the bit alignment |
| | 662 | * to 16-12 = 4 before putting out the EOL code. |
| | 663 | */ |
| | 664 | int align = 8 - 4; |
| | 665 | if (align != sp->bit) { |
| | 666 | if (align > sp->bit) |
| | 667 | align = sp->bit + (8 - align); |
| | 668 | else |
| | 669 | align = sp->bit - align; |
| | 670 | code = 0; |
| | 671 | tparm=align; |
| | 672 | _PutBits(tif, 0, tparm); |
| | 673 | } |
| | 674 | } |
| | 675 | code = EOL, length = 12; |
| | 676 | if (is2DEncoding(sp)) |
| | 677 | code = (code<<1) | (sp->tag == G3_1D), length++; |
| | 678 | _PutBits(tif, code, length); |
| | 679 | |
| | 680 | sp->data = data; |
| | 681 | sp->bit = bit; |
| | 682 | } |
| | 683 | |
| | 684 | /* |
| | 685 | * Reset encoding state at the start of a strip. |
| | 686 | */ |
| | 687 | static int |
| | 688 | Fax3PreEncode(TIFF* tif, tsample_t s) |
| | 689 | { |
| | 690 | Fax3CodecState* sp = EncoderState(tif); |
| | 691 | |
| | 692 | (void) s; |
| | 693 | assert(sp != NULL); |
| | 694 | sp->bit = 8; |
| | 695 | sp->data = 0; |
| | 696 | sp->tag = G3_1D; |
| | 697 | /* |
| | 698 | * This is necessary for Group 4; otherwise it isn't |
| | 699 | * needed because the first scanline of each strip ends |
| | 700 | * up being copied into the refline. |
| | 701 | */ |
| | 702 | if (sp->refline) |
| | 703 | _TIFFmemset(sp->refline, 0x00, sp->b.rowbytes); |
| | 704 | if (is2DEncoding(sp)) { |
| | 705 | float res = tif->tif_dir.td_yresolution; |
| | 706 | /* |
| | 707 | * The CCITT spec says that when doing 2d encoding, you |
| | 708 | * should only do it on K consecutive scanlines, where K |
| | 709 | * depends on the resolution of the image being encoded |
| | 710 | * (2 for <= 200 lpi, 4 for > 200 lpi). Since the directory |
| | 711 | * code initializes td_yresolution to 0, this code will |
| | 712 | * select a K of 2 unless the YResolution tag is set |
| | 713 | * appropriately. (Note also that we fudge a little here |
| | 714 | * and use 150 lpi to avoid problems with units conversion.) |
| | 715 | */ |
| | 716 | if (tif->tif_dir.td_resolutionunit == RESUNIT_CENTIMETER) |
| | 717 | res *= 2.54f; /* convert to inches */ |
| | 718 | sp->maxk = (res > 150 ? 4 : 2); |
| | 719 | sp->k = sp->maxk-1; |
| | 720 | } else |
| | 721 | sp->k = sp->maxk = 0; |
| | 722 | return (1); |
| | 723 | } |
| | 724 | |
| | 725 | static const u_char zeroruns[256] = { |
| | 726 | 8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, /* 0x00 - 0x0f */ |
| | 727 | 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0x10 - 0x1f */ |
| | 728 | 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x20 - 0x2f */ |
| | 729 | 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x30 - 0x3f */ |
| | 730 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x40 - 0x4f */ |
| | 731 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x50 - 0x5f */ |
| | 732 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x60 - 0x6f */ |
| | 733 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x70 - 0x7f */ |
| | 734 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x80 - 0x8f */ |
| | 735 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x90 - 0x9f */ |
| | 736 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xa0 - 0xaf */ |
| | 737 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xb0 - 0xbf */ |
| | 738 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xc0 - 0xcf */ |
| | 739 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xd0 - 0xdf */ |
| | 740 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xe0 - 0xef */ |
| | 741 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xf0 - 0xff */ |
| | 742 | }; |
| | 743 | static const u_char oneruns[256] = { |
| | 744 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x00 - 0x0f */ |
| | 745 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x10 - 0x1f */ |
| | 746 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x20 - 0x2f */ |
| | 747 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x30 - 0x3f */ |
| | 748 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x40 - 0x4f */ |
| | 749 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x50 - 0x5f */ |
| | 750 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x60 - 0x6f */ |
| | 751 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x70 - 0x7f */ |
| | 752 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x80 - 0x8f */ |
| | 753 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x90 - 0x9f */ |
| | 754 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xa0 - 0xaf */ |
| | 755 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xb0 - 0xbf */ |
| | 756 | 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xc0 - 0xcf */ |
| | 757 | 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xd0 - 0xdf */ |
| | 758 | 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0xe0 - 0xef */ |
| | 759 | 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 8, /* 0xf0 - 0xff */ |
| | 760 | }; |
| | 761 | |
| | 762 | /* |
| | 763 | * On certain systems it pays to inline |
| | 764 | * the routines that find pixel spans. |
| | 765 | */ |
| | 766 | #ifdef VAXC |
| | 767 | static int32 find0span(u_char*, int32, int32); |
| | 768 | static int32 find1span(u_char*, int32, int32); |
| | 769 | #pragma inline(find0span,find1span) |
| | 770 | #endif |
| | 771 | |
| | 772 | /* |
| | 773 | * Find a span of ones or zeros using the supplied |
| | 774 | * table. The ``base'' of the bit string is supplied |
| | 775 | * along with the start+end bit indices. |
| | 776 | */ |
| | 777 | INLINE static int32 |
| | 778 | find0span(u_char* bp, int32 bs, int32 be) |
| | 779 | { |
| | 780 | int32 bits = be - bs; |
| | 781 | int32 n, span; |
| | 782 | |
| | 783 | bp += bs>>3; |
| | 784 | /* |
| | 785 | * Check partial byte on lhs. |
| | 786 | */ |
| | 787 | if (bits > 0 && (n = (bs & 7))) { |
| | 788 | span = zeroruns[(*bp << n) & 0xff]; |
| | 789 | if (span > 8-n) /* table value too generous */ |
| | 790 | span = 8-n; |
| | 791 | if (span > bits) /* constrain span to bit range */ |
| | 792 | span = bits; |
| | 793 | if (n+span < 8) /* doesn't extend to edge of byte */ |
| | 794 | return (span); |
| | 795 | bits -= span; |
| | 796 | bp++; |
| | 797 | } else |
| | 798 | span = 0; |
| | 799 | if (bits >= 2*8*sizeof (long)) { |
| | 800 | long* lp; |
| | 801 | /* |
| | 802 | * Align to longword boundary and check longwords. |
| | 803 | */ |
| | 804 | while (!isAligned(bp, long)) { |
| | 805 | if (*bp != 0x00) |
| | 806 | return (span + zeroruns[*bp]); |
| | 807 | span += 8, bits -= 8; |
| | 808 | bp++; |
| | 809 | } |
| | 810 | lp = (long*) bp; |
| | 811 | while (bits >= 8*sizeof (long) && *lp == 0) { |
| | 812 | span += 8*sizeof (long), bits -= 8*sizeof (long); |
| | 813 | lp++; |
| | 814 | } |
| | 815 | bp = (u_char*) lp; |
| | 816 | } |
| | 817 | /* |
| | 818 | * Scan full bytes for all 0's. |
| | 819 | */ |
| | 820 | while (bits >= 8) { |
| | 821 | if (*bp != 0x00) /* end of run */ |
| | 822 | return (span + zeroruns[*bp]); |
| | 823 | span += 8, bits -= 8; |
| | 824 | bp++; |
| | 825 | } |
| | 826 | /* |
| | 827 | * Check partial byte on rhs. |
| | 828 | */ |
| | 829 | if (bits > 0) { |
| | 830 | n = zeroruns[*bp]; |
| | 831 | span += (n > bits ? bits : n); |
| | 832 | } |
| | 833 | return (span); |
| | 834 | } |
| | 835 | |
| | 836 | INLINE static int32 |
| | 837 | find1span(u_char* bp, int32 bs, int32 be) |
| | 838 | { |
| | 839 | int32 bits = be - bs; |
| | 840 | int32 n, span; |
| | 841 | |
| | 842 | bp += bs>>3; |
| | 843 | /* |
| | 844 | * Check partial byte on lhs. |
| | 845 | */ |
| | 846 | if (bits > 0 && (n = (bs & 7))) { |
| | 847 | span = oneruns[(*bp << n) & 0xff]; |
| | 848 | if (span > 8-n) /* table value too generous */ |
| | 849 | span = 8-n; |
| | 850 | if (span > bits) /* constrain span to bit range */ |
| | 851 | span = bits; |
| | 852 | if (n+span < 8) /* doesn't extend to edge of byte */ |
| | 853 | return (span); |
| | 854 | bits -= span; |
| | 855 | bp++; |
| | 856 | } else |
| | 857 | span = 0; |
| | 858 | if (bits >= 2*8*sizeof (long)) { |
| | 859 | long* lp; |
| | 860 | /* |
| | 861 | * Align to longword boundary and check longwords. |
| | 862 | */ |
| | 863 | while (!isAligned(bp, long)) { |
| | 864 | if (*bp != 0xff) |
| | 865 | return (span + oneruns[*bp]); |
| | 866 | span += 8, bits -= 8; |
| | 867 | bp++; |
| | 868 | } |
| | 869 | lp = (long*) bp; |
| | 870 | while (bits >= 8*sizeof (long) && *lp == ~0) { |
| | 871 | span += 8*sizeof (long), bits -= 8*sizeof (long); |
| | 872 | lp++; |
| | 873 | } |
| | 874 | bp = (u_char*) lp; |
| | 875 | } |
| | 876 | /* |
| | 877 | * Scan full bytes for all 1's. |
| | 878 | */ |
| | 879 | while (bits >= 8) { |
| | 880 | if (*bp != 0xff) /* end of run */ |
| | 881 | return (span + oneruns[*bp]); |
| | 882 | span += 8, bits -= 8; |
| | 883 | bp++; |
| | 884 | } |
| | 885 | /* |
| | 886 | * Check partial byte on rhs. |
| | 887 | */ |
| | 888 | if (bits > 0) { |
| | 889 | n = oneruns[*bp]; |
| | 890 | span += (n > bits ? bits : n); |
| | 891 | } |
| | 892 | return (span); |
| | 893 | } |
| | 894 | |
| | 895 | /* |
| | 896 | * Return the offset of the next bit in the range |
| | 897 | * [bs..be] that is different from the specified |
| | 898 | * color. The end, be, is returned if no such bit |
| | 899 | * exists. |
| | 900 | */ |
| | 901 | #define finddiff(_cp, _bs, _be, _color) \ |
| | 902 | (_bs + (_color ? find1span(_cp,_bs,_be) : find0span(_cp,_bs,_be))) |
| | 903 | /* |
| | 904 | * Like finddiff, but also check the starting bit |
| | 905 | * against the end in case start > end. |
| | 906 | */ |
| | 907 | #define finddiff2(_cp, _bs, _be, _color) \ |
| | 908 | (_bs < _be ? finddiff(_cp,_bs,_be,_color) : _be) |
| | 909 | |
| | 910 | /* |
| | 911 | * 1d-encode a row of pixels. The encoding is |
| | 912 | * a sequence of all-white or all-black spans |
| | 913 | * of pixels encoded with Huffman codes. |
| | 914 | */ |
| | 915 | static int |
| | 916 | Fax3Encode1DRow(TIFF* tif, u_char* bp, uint32 bits) |
| | 917 | { |
| | 918 | Fax3CodecState* sp = EncoderState(tif); |
| | 919 | int32 span; |
| | 920 | uint32 bs = 0; |
| | 921 | |
| | 922 | for (;;) { |
| | 923 | span = find0span(bp, bs, bits); /* white span */ |
| | 924 | putspan(tif, span, TIFFFaxWhiteCodes); |
| | 925 | bs += span; |
| | 926 | if (bs >= bits) |
| | 927 | break; |
| | 928 | span = find1span(bp, bs, bits); /* black span */ |
| | 929 | putspan(tif, span, TIFFFaxBlackCodes); |
| | 930 | bs += span; |
| | 931 | if (bs >= bits) |
| | 932 | break; |
| | 933 | } |
| | 934 | if (sp->b.mode & (FAXMODE_BYTEALIGN|FAXMODE_WORDALIGN)) { |
| | 935 | if (sp->bit != 8) /* byte-align */ |
| | 936 | Fax3FlushBits(tif, sp); |
| | 937 | if ((sp->b.mode&FAXMODE_WORDALIGN) && |
| | 938 | !isAligned(tif->tif_rawcp, uint16)) |
| | 939 | Fax3FlushBits(tif, sp); |
| | 940 | } |
| | 941 | return (1); |
| | 942 | } |
| | 943 | |
| | 944 | static const tableentry horizcode = |
| | 945 | { 3, 0x1 }; /* 001 */ |
| | 946 | static const tableentry passcode = |
| | 947 | { 4, 0x1 }; /* 0001 */ |
| | 948 | static const tableentry vcodes[7] = { |
| | 949 | { 7, 0x03 }, /* 0000 011 */ |
| | 950 | { 6, 0x03 }, /* 0000 11 */ |
| | 951 | { 3, 0x03 }, /* 011 */ |
| | 952 | { 1, 0x1 }, /* 1 */ |
| | 953 | { 3, 0x2 }, /* 010 */ |
| | 954 | { 6, 0x02 }, /* 0000 10 */ |
| | 955 | { 7, 0x02 } /* 0000 010 */ |
| | 956 | }; |
| | 957 | |
| | 958 | /* |
| | 959 | * 2d-encode a row of pixels. Consult the CCITT |
| | 960 | * documentation for the algorithm. |
| | 961 | */ |
| | 962 | static int |
| | 963 | Fax3Encode2DRow(TIFF* tif, u_char* bp, u_char* rp, uint32 bits) |
| | 964 | { |
| | 965 | #define PIXEL(buf,ix) ((((buf)[(ix)>>3]) >> (7-((ix)&7))) & 1) |
| | 966 | uint32 a0 = 0; |
| | 967 | uint32 a1 = (PIXEL(bp, 0) != 0 ? 0 : finddiff(bp, 0, bits, 0)); |
| | 968 | uint32 b1 = (PIXEL(rp, 0) != 0 ? 0 : finddiff(rp, 0, bits, 0)); |
| | 969 | uint32 a2, b2; |
| | 970 | |
| | 971 | for (;;) { |
| | 972 | b2 = finddiff2(rp, b1, bits, PIXEL(rp,b1)); |
| | 973 | if (b2 >= a1) { |
| | 974 | int32 d = b1 - a1; |
| | 975 | if (!(-3 <= d && d <= 3)) { /* horizontal mode */ |
| | 976 | a2 = finddiff2(bp, a1, bits, PIXEL(bp,a1)); |
| | 977 | putcode(tif, &horizcode); |
| | 978 | if (a0+a1 == 0 || PIXEL(bp, a0) == 0) { |
| | 979 | putspan(tif, a1-a0, TIFFFaxWhiteCodes); |
| | 980 | putspan(tif, a2-a1, TIFFFaxBlackCodes); |
| | 981 | } else { |
| | 982 | putspan(tif, a1-a0, TIFFFaxBlackCodes); |
| | 983 | putspan(tif, a2-a1, TIFFFaxWhiteCodes); |
| | 984 | } |
| | 985 | a0 = a2; |
| | 986 | } else { /* vertical mode */ |
| | 987 | putcode(tif, &vcodes[d+3]); |
| | 988 | a0 = a1; |
| | 989 | } |
| | 990 | } else { /* pass mode */ |
| | 991 | putcode(tif, &passcode); |
| | 992 | a0 = b2; |
| | 993 | } |
| | 994 | if (a0 >= bits) |
| | 995 | break; |
| | 996 | a1 = finddiff(bp, a0, bits, PIXEL(bp,a0)); |
| | 997 | b1 = finddiff(rp, a0, bits, !PIXEL(bp,a0)); |
| | 998 | b1 = finddiff(rp, b1, bits, PIXEL(bp,a0)); |
| | 999 | } |
| | 1000 | return (1); |
| | 1001 | #undef PIXEL |
| | 1002 | } |
| | 1003 | |
| | 1004 | /* |
| | 1005 | * Encode a buffer of pixels. |
| | 1006 | */ |
| | 1007 | static int |
| | 1008 | Fax3Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s) |
| | 1009 | { |
| | 1010 | Fax3CodecState* sp = EncoderState(tif); |
| | 1011 | |
| | 1012 | (void) s; |
| | 1013 | while ((long)cc > 0) { |
| | 1014 | if ((sp->b.mode & FAXMODE_NOEOL) == 0) |
| | 1015 | Fax3PutEOL(tif); |
| | 1016 | if (is2DEncoding(sp)) { |
| | 1017 | if (sp->tag == G3_1D) { |
| | 1018 | if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels)) |
| | 1019 | return (0); |
| | 1020 | sp->tag = G3_2D; |
| | 1021 | } else { |
| | 1022 | if (!Fax3Encode2DRow(tif, bp, sp->refline, 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 | u_int code = EOL; |
| | 1057 | u_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 | if (tif->tif_data) { |
| | 1072 | Fax3CodecState* sp = DecoderState(tif); |
| | 1073 | |
| | 1074 | if (sp->runs) |
| | 1075 | _TIFFfree(sp->runs); |
| | 1076 | if (sp->refline) |
| | 1077 | _TIFFfree(sp->refline); |
| | 1078 | |
| | 1079 | if (Fax3State(tif)->subaddress) |
| | 1080 | _TIFFfree(Fax3State(tif)->subaddress); |
| | 1081 | _TIFFfree(tif->tif_data); |
| | 1082 | tif->tif_data = NULL; |
| | 1083 | } |
| | 1084 | } |
| | 1085 | |
| | 1086 | #define FIELD_BADFAXLINES (FIELD_CODEC+0) |
| | 1087 | #define FIELD_CLEANFAXDATA (FIELD_CODEC+1) |
| | 1088 | #define FIELD_BADFAXRUN (FIELD_CODEC+2) |
| | 1089 | #define FIELD_RECVPARAMS (FIELD_CODEC+3) |
| | 1090 | #define FIELD_SUBADDRESS (FIELD_CODEC+4) |
| | 1091 | #define FIELD_RECVTIME (FIELD_CODEC+5) |
| | 1092 | |
| | 1093 | #define FIELD_OPTIONS (FIELD_CODEC+6) |
| | 1094 | |
| | 1095 | static const TIFFFieldInfo faxFieldInfo[] = { |
| | 1096 | { TIFFTAG_FAXMODE, 0, 0, TIFF_ANY, FIELD_PSEUDO, |
| | 1097 | FALSE, FALSE, "FaxMode" }, |
| | 1098 | { TIFFTAG_FAXFILLFUNC, 0, 0, TIFF_ANY, FIELD_PSEUDO, |
| | 1099 | FALSE, FALSE, "FaxFillFunc" }, |
| | 1100 | { TIFFTAG_BADFAXLINES, 1, 1, TIFF_LONG, FIELD_BADFAXLINES, |
| | 1101 | TRUE, FALSE, "BadFaxLines" }, |
| | 1102 | { TIFFTAG_BADFAXLINES, 1, 1, TIFF_SHORT, FIELD_BADFAXLINES, |
| | 1103 | TRUE, FALSE, "BadFaxLines" }, |
| | 1104 | { TIFFTAG_CLEANFAXDATA, 1, 1, TIFF_SHORT, FIELD_CLEANFAXDATA, |
| | 1105 | TRUE, FALSE, "CleanFaxData" }, |
| | 1106 | { TIFFTAG_CONSECUTIVEBADFAXLINES,1,1, TIFF_LONG, FIELD_BADFAXRUN, |
| | 1107 | TRUE, FALSE, "ConsecutiveBadFaxLines" }, |
| | 1108 | { TIFFTAG_CONSECUTIVEBADFAXLINES,1,1, TIFF_SHORT, FIELD_BADFAXRUN, |
| | 1109 | TRUE, FALSE, "ConsecutiveBadFaxLines" }, |
| | 1110 | { TIFFTAG_FAXRECVPARAMS, 1, 1, TIFF_LONG, FIELD_RECVPARAMS, |
| | 1111 | TRUE, FALSE, "FaxRecvParams" }, |
| | 1112 | { TIFFTAG_FAXSUBADDRESS, -1,-1, TIFF_ASCII, FIELD_SUBADDRESS, |
| | 1113 | TRUE, FALSE, "FaxSubAddress" }, |
| | 1114 | { TIFFTAG_FAXRECVTIME, 1, 1, TIFF_LONG, FIELD_RECVTIME, |
| | 1115 | TRUE, FALSE, "FaxRecvTime" }, |
| | 1116 | }; |
| | 1117 | static const TIFFFieldInfo fax3FieldInfo[] = { |
| | 1118 | { TIFFTAG_GROUP3OPTIONS, 1, 1, TIFF_LONG, FIELD_OPTIONS, |
| | 1119 | FALSE, FALSE, "Group3Options" }, |
| | 1120 | }; |
| | 1121 | static const TIFFFieldInfo fax4FieldInfo[] = { |
| | 1122 | { TIFFTAG_GROUP4OPTIONS, 1, 1, TIFF_LONG, FIELD_OPTIONS, |
| | 1123 | FALSE, FALSE, "Group4Options" }, |
| | 1124 | }; |
| | 1125 | #define N(a) (sizeof (a) / sizeof (a[0])) |
| | 1126 | |
| | 1127 | static int |
| | 1128 | Fax3VSetField(TIFF* tif, ttag_t tag, va_list ap) |
| | 1129 | { |
| | 1130 | Fax3BaseState* sp = Fax3State(tif); |
| | 1131 | |
| | 1132 | switch (tag) { |
| | 1133 | case TIFFTAG_FAXMODE: |
| | 1134 | sp->mode = va_arg(ap, int); |
| | 1135 | return (1); /* NB: pseudo tag */ |
| | 1136 | case TIFFTAG_FAXFILLFUNC: |
| | 1137 | DecoderState(tif)->fill = va_arg(ap, TIFFFaxFillFunc); |
| | 1138 | return (1); /* NB: pseudo tag */ |
| | 1139 | case TIFFTAG_GROUP3OPTIONS: |
| | 1140 | case TIFFTAG_GROUP4OPTIONS: |
| | 1141 | sp->groupoptions = va_arg(ap, uint32); |
| | 1142 | break; |
| | 1143 | case TIFFTAG_BADFAXLINES: |
| | 1144 | sp->badfaxlines = va_arg(ap, uint32); |
| | 1145 | break; |
| | 1146 | case TIFFTAG_CLEANFAXDATA: |
| | 1147 | sp->cleanfaxdata = (uint16) va_arg(ap, int); |
| | 1148 | break; |
| | 1149 | case TIFFTAG_CONSECUTIVEBADFAXLINES: |
| | 1150 | sp->badfaxrun = va_arg(ap, uint32); |
| | 1151 | break; |
| | 1152 | case TIFFTAG_FAXRECVPARAMS: |
| | 1153 | sp->recvparams = va_arg(ap, uint32); |
| | 1154 | break; |
| | 1155 | case TIFFTAG_FAXSUBADDRESS: |
| | 1156 | _TIFFsetString(&sp->subaddress, va_arg(ap, char*)); |
| | 1157 | break; |
| | 1158 | case TIFFTAG_FAXRECVTIME: |
| | 1159 | sp->recvtime = va_arg(ap, uint32); |
| | 1160 | break; |
| | 1161 | default: |
| | 1162 | return (*sp->vsetparent)(tif, tag, ap); |
| | 1163 | } |
| | 1164 | TIFFSetFieldBit(tif, _TIFFFieldWithTag(tif, tag)->field_bit); |
| | 1165 | tif->tif_flags |= TIFF_DIRTYDIRECT; |
| | 1166 | return (1); |
| | 1167 | } |
| | 1168 | |
| | 1169 | static int |
| | 1170 | Fax3VGetField(TIFF* tif, ttag_t tag, va_list ap) |
| | 1171 | { |
| | 1172 | Fax3BaseState* sp = Fax3State(tif); |
| | 1173 | |
| | 1174 | switch (tag) { |
| | 1175 | case TIFFTAG_FAXMODE: |
| | 1176 | *va_arg(ap, int*) = sp->mode; |
| | 1177 | break; |
| | 1178 | case TIFFTAG_FAXFILLFUNC: |
| | 1179 | *va_arg(ap, TIFFFaxFillFunc*) = DecoderState(tif)->fill; |
| | 1180 | break; |
| | 1181 | case TIFFTAG_GROUP3OPTIONS: |
| | 1182 | case TIFFTAG_GROUP4OPTIONS: |
| | 1183 | *va_arg(ap, uint32*) = sp->groupoptions; |
| | 1184 | break; |
| | 1185 | case TIFFTAG_BADFAXLINES: |
| | 1186 | *va_arg(ap, uint32*) = sp->badfaxlines; |
| | 1187 | break; |
| | 1188 | case TIFFTAG_CLEANFAXDATA: |
| | 1189 | *va_arg(ap, uint16*) = sp->cleanfaxdata; |
| | 1190 | break; |
| | 1191 | case TIFFTAG_CONSECUTIVEBADFAXLINES: |
| | 1192 | *va_arg(ap, uint32*) = sp->badfaxrun; |
| | 1193 | break; |
| | 1194 | case TIFFTAG_FAXRECVPARAMS: |
| | 1195 | *va_arg(ap, uint32*) = sp->recvparams; |
| | 1196 | break; |
| | 1197 | case TIFFTAG_FAXSUBADDRESS: |
| | 1198 | *va_arg(ap, char**) = sp->subaddress; |
| | 1199 | break; |
| | 1200 | case TIFFTAG_FAXRECVTIME: |
| | 1201 | *va_arg(ap, uint32*) = sp->recvtime; |
| | 1202 | break; |
| | 1203 | default: |
| | 1204 | return (*sp->vgetparent)(tif, tag, ap); |
| | 1205 | } |
| | 1206 | return (1); |
| | 1207 | } |
| | 1208 | |
| | 1209 | static void |
| | 1210 | Fax3PrintDir(TIFF* tif, FILE* fd, long flags) |
| | 1211 | { |
| | 1212 | Fax3BaseState* sp = Fax3State(tif); |
| | 1213 | |
| | 1214 | (void) flags; |
| | 1215 | if (TIFFFieldSet(tif,FIELD_OPTIONS)) { |
| | 1216 | const char* sep = " "; |
| | 1217 | if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4) { |
| | 1218 | fprintf(fd, " Group 4 Options:"); |
| | 1219 | if (sp->groupoptions & GROUP4OPT_UNCOMPRESSED) |
| | 1220 | fprintf(fd, "%suncompressed data", sep); |
| | 1221 | } else { |
| | 1222 | |
| | 1223 | fprintf(fd, " Group 3 Options:"); |
| | 1224 | if (sp->groupoptions & GROUP3OPT_2DENCODING) |
| | 1225 | fprintf(fd, "%s2-d encoding", sep), sep = "+"; |
| | 1226 | if (sp->groupoptions & GROUP3OPT_FILLBITS) |
| | 1227 | fprintf(fd, "%sEOL padding", sep), sep = "+"; |
| | 1228 | if (sp->groupoptions & GROUP3OPT_UNCOMPRESSED) |
| | 1229 | fprintf(fd, "%suncompressed data", sep); |
| | 1230 | } |
| | 1231 | fprintf(fd, " (%lu = 0x%lx)\n", |
| | 1232 | (u_long) sp->groupoptions, (u_long) sp->groupoptions); |
| | 1233 | } |
| | 1234 | if (TIFFFieldSet(tif,FIELD_CLEANFAXDATA)) { |
| | 1235 | fprintf(fd, " Fax Data:"); |
| | 1236 | switch (sp->cleanfaxdata) { |
| | 1237 | case CLEANFAXDATA_CLEAN: |
| | 1238 | fprintf(fd, " clean"); |
| | 1239 | break; |
| | 1240 | case CLEANFAXDATA_REGENERATED: |
| | 1241 | fprintf(fd, " receiver regenerated"); |
| | 1242 | break; |
| | 1243 | case CLEANFAXDATA_UNCLEAN: |
| | 1244 | fprintf(fd, " uncorrected errors"); |
| | 1245 | break; |
| | 1246 | } |
| | 1247 | fprintf(fd, " (%u = 0x%x)\n", |
| | 1248 | sp->cleanfaxdata, sp->cleanfaxdata); |
| | 1249 | } |
| | 1250 | if (TIFFFieldSet(tif,FIELD_BADFAXLINES)) |
| | 1251 | fprintf(fd, " Bad Fax Lines: %lu\n", (u_long) sp->badfaxlines); |
| | 1252 | if (TIFFFieldSet(tif,FIELD_BADFAXRUN)) |
| | 1253 | fprintf(fd, " Consecutive Bad Fax Lines: %lu\n", |
| | 1254 | (u_long) sp->badfaxrun); |
| | 1255 | if (TIFFFieldSet(tif,FIELD_RECVPARAMS)) |
| | 1256 | fprintf(fd, " Fax Receive Parameters: %08lx\n", |
| | 1257 | (u_long) sp->recvparams); |
| | 1258 | if (TIFFFieldSet(tif,FIELD_SUBADDRESS)) |
| | 1259 | fprintf(fd, " Fax SubAddress: %s\n", sp->subaddress); |
| | 1260 | if (TIFFFieldSet(tif,FIELD_RECVTIME)) |
| | 1261 | fprintf(fd, " Fax Receive Time: %lu secs\n", |
| | 1262 | (u_long) sp->recvtime); |
| | 1263 | } |
| | 1264 | |
| | 1265 | static int |
| | 1266 | InitCCITTFax3(TIFF* tif) |
| | 1267 | { |
| | 1268 | Fax3BaseState* sp; |
| | 1269 | |
| | 1270 | /* |
| | 1271 | * Allocate state block so tag methods have storage to record values. |
| | 1272 | */ |
| | 1273 | tif->tif_data = (tidata_t) |
| | 1274 | _TIFFmalloc(sizeof (Fax3CodecState)); |
| | 1275 | |
| | 1276 | if (tif->tif_data == NULL) { |
| | 1277 | TIFFError("TIFFInitCCITTFax3", |
| | 1278 | "%s: No space for state block", tif->tif_name); |
| | 1279 | return (0); |
| | 1280 | } |
| | 1281 | |
| | 1282 | sp = Fax3State(tif); |
| | 1283 | sp->rw_mode = tif->tif_mode; |
| | 1284 | |
| | 1285 | /* |
| | 1286 | * Merge codec-specific tag information and |
| | 1287 | * override parent get/set field methods. |
| | 1288 | */ |
| | 1289 | _TIFFMergeFieldInfo(tif, faxFieldInfo, N(faxFieldInfo)); |
| | 1290 | sp->vgetparent = tif->tif_tagmethods.vgetfield; |
| | 1291 | tif->tif_tagmethods.vgetfield = Fax3VGetField; /* hook for codec tags */ |
| | 1292 | sp->vsetparent = tif->tif_tagmethods.vsetfield; |
| | 1293 | tif->tif_tagmethods.vsetfield = Fax3VSetField; /* hook for codec tags */ |
| | 1294 | tif->tif_tagmethods.printdir = Fax3PrintDir; /* hook for codec tags */ |
| | 1295 | sp->groupoptions = 0; |
| | 1296 | sp->recvparams = 0; |
| | 1297 | sp->subaddress = NULL; |
| | 1298 | |
| | 1299 | tif->tif_flags |= TIFF_NOBITREV; /* decoder does bit reversal */ |
| | 1300 | DecoderState(tif)->runs = NULL; |
| | 1301 | TIFFSetField(tif, TIFFTAG_FAXFILLFUNC, _TIFFFax3fillruns); |
| | 1302 | EncoderState(tif)->refline = NULL; |
| | 1303 | |
| | 1304 | /* |
| | 1305 | * Install codec methods. |
| | 1306 | */ |
| | 1307 | tif->tif_setupdecode = Fax3SetupState; |
| | 1308 | tif->tif_predecode = Fax3PreDecode; |
| | 1309 | tif->tif_decoderow = Fax3Decode1D; |
| | 1310 | tif->tif_decodestrip = Fax3Decode1D; |
| | 1311 | tif->tif_decodetile = Fax3Decode1D; |
| | 1312 | tif->tif_setupencode = Fax3SetupState; |
| | 1313 | tif->tif_preencode = Fax3PreEncode; |
| | 1314 | tif->tif_postencode = Fax3PostEncode; |
| | 1315 | tif->tif_encoderow = Fax3Encode; |
| | 1316 | tif->tif_encodestrip = Fax3Encode; |
| | 1317 | tif->tif_encodetile = Fax3Encode; |
| | 1318 | tif->tif_close = Fax3Close; |
| | 1319 | tif->tif_cleanup = Fax3Cleanup; |
| | 1320 | |
| | 1321 | return (1); |
| | 1322 | } |
| | 1323 | |
| | 1324 | int |
| | 1325 | TIFFInitCCITTFax3(TIFF* tif, int scheme) |
| | 1326 | { |
| | 1327 | if (InitCCITTFax3(tif)) { |
| | 1328 | _TIFFMergeFieldInfo(tif, fax3FieldInfo, N(fax3FieldInfo)); |
| | 1329 | |
| | 1330 | /* |
| | 1331 | * The default format is Class/F-style w/o RTC. |
| | 1332 | */ |
| | 1333 | return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_CLASSF); |
| | 1334 | } else |
| | 1335 | return (0); |
| | 1336 | } |
| | 1337 | |
| | 1338 | /* |
| | 1339 | * CCITT Group 4 (T.6) Facsimile-compatible |
| | 1340 | * Compression Scheme Support. |
| | 1341 | */ |
| | 1342 | |
| | 1343 | #define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; } |
| | 1344 | /* |
| | 1345 | * Decode the requested amount of G4-encoded data. |
| | 1346 | */ |
| | 1347 | static int |
| | 1348 | Fax4Decode(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s) |
| | 1349 | { |
| | 1350 | DECLARE_STATE_2D(tif, sp, "Fax4Decode"); |
| | 1351 | |
| | 1352 | (void) s; |
| | 1353 | CACHE_STATE(tif, sp); |
| | 1354 | while ((long)occ > 0) { |
| | 1355 | a0 = 0; |
| | 1356 | RunLength = 0; |
| | 1357 | pa = thisrun = sp->curruns; |
| | 1358 | pb = sp->refruns; |
| | 1359 | b1 = *pb++; |
| | 1360 | #ifdef FAX3_DEBUG |
| | 1361 | printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail); |
| | 1362 | printf("-------------------- %d\n", tif->tif_row); |
| | 1363 | fflush(stdout); |
| | 1364 | #endif |
| | 1365 | EXPAND2D(EOFG4); |
| | 1366 | if (EOLcnt) |
| | 1367 | goto EOFG4; |
| | 1368 | (*sp->fill)(buf, thisrun, pa, lastx); |
| | 1369 | SETVAL(0); /* imaginary change for reference */ |
| | 1370 | SWAP(uint32*, sp->curruns, sp->refruns); |
| | 1371 | buf += sp->b.rowbytes; |
| | 1372 | occ -= sp->b.rowbytes; |
| | 1373 | continue; |
| | 1374 | EOFG4: |
| | 1375 | NeedBits16( 13, BADG4 ); |
| | 1376 | BADG4: |
| | 1377 | #ifdef FAX3_DEBUG |
| | 1378 | if( GetBits(13) != 0x1001 ) |
| | 1379 | fputs( "Bad RTC\n", stderr ); |
| | 1380 | #endif |
| | 1381 | ClrBits( 13 ); |
| | 1382 | (*sp->fill)(buf, thisrun, pa, lastx); |
| | 1383 | UNCACHE_STATE(tif, sp); |
| | 1384 | return (-1); |
| | 1385 | } |
| | 1386 | UNCACHE_STATE(tif, sp); |
| | 1387 | return (1); |
| | 1388 | } |
| | 1389 | #undef SWAP |
| | 1390 | |
| | 1391 | /* |
| | 1392 | * Encode the requested amount of data. |
| | 1393 | */ |
| | 1394 | static int |
| | 1395 | Fax4Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s) |
| | 1396 | { |
| | 1397 | Fax3CodecState *sp = EncoderState(tif); |
| | 1398 | |
| | 1399 | (void) s; |
| | 1400 | while ((long)cc > 0) { |
| | 1401 | if (!Fax3Encode2DRow(tif, bp, sp->refline, sp->b.rowpixels)) |
| | 1402 | return (0); |
| | 1403 | _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes); |
| | 1404 | bp += sp->b.rowbytes; |
| | 1405 | cc -= sp->b.rowbytes; |
| | 1406 | } |
| | 1407 | return (1); |
| | 1408 | } |
| | 1409 | |
| | 1410 | static int |
| | 1411 | Fax4PostEncode(TIFF* tif) |
| | 1412 | { |
| | 1413 | Fax3CodecState *sp = EncoderState(tif); |
| | 1414 | |
| | 1415 | /* terminate strip w/ EOFB */ |
| | 1416 | Fax3PutBits(tif, EOL, 12); |
| | 1417 | Fax3PutBits(tif, EOL, 12); |
| | 1418 | if (sp->bit != 8) |
| | 1419 | Fax3FlushBits(tif, sp); |
| | 1420 | return (1); |
| | 1421 | } |
| | 1422 | |
| | 1423 | int |
| | 1424 | TIFFInitCCITTFax4(TIFF* tif, int scheme) |
| | 1425 | { |
| | 1426 | if (InitCCITTFax3(tif)) { /* reuse G3 support */ |
| | 1427 | _TIFFMergeFieldInfo(tif, fax4FieldInfo, N(fax4FieldInfo)); |
| | 1428 | |
| | 1429 | tif->tif_decoderow = Fax4Decode; |
| | 1430 | tif->tif_decodestrip = Fax4Decode; |
| | 1431 | tif->tif_decodetile = Fax4Decode; |
| | 1432 | tif->tif_encoderow = Fax4Encode; |
| | 1433 | tif->tif_encodestrip = Fax4Encode; |
| | 1434 | tif->tif_encodetile = Fax4Encode; |
| | 1435 | tif->tif_postencode = Fax4PostEncode; |
| | 1436 | /* |
| | 1437 | * Suppress RTC at the end of each strip. |
| | 1438 | */ |
| | 1439 | return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_NORTC); |
| | 1440 | } else |
| | 1441 | return (0); |
| | 1442 | } |
| | 1443 | |
| | 1444 | /* |
| | 1445 | * CCITT Group 3 1-D Modified Huffman RLE Compression Support. |
| | 1446 | * (Compression algorithms 2 and 32771) |
| | 1447 | */ |
| | 1448 | |
| | 1449 | /* |
| | 1450 | * Decode the requested amount of RLE-encoded data. |
| | 1451 | */ |
| | 1452 | static int |
| | 1453 | Fax3DecodeRLE(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s) |
| | 1454 | { |
| | 1455 | DECLARE_STATE(tif, sp, "Fax3DecodeRLE"); |
| | 1456 | int mode = sp->b.mode; |
| | 1457 | |
| | 1458 | (void) s; |
| | 1459 | CACHE_STATE(tif, sp); |
| | 1460 | thisrun = sp->curruns; |
| | 1461 | while ((long)occ > 0) { |
| | 1462 | a0 = 0; |
| | 1463 | RunLength = 0; |
| | 1464 | pa = thisrun; |
| | 1465 | #ifdef FAX3_DEBUG |
| | 1466 | printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail); |
| | 1467 | printf("-------------------- %d\n", tif->tif_row); |
| | 1468 | fflush(stdout); |
| | 1469 | #endif |
| | 1470 | EXPAND1D(EOFRLE); |
| | 1471 | (*sp->fill)(buf, thisrun, pa, lastx); |
| | 1472 | /* |
| | 1473 | * Cleanup at the end of the row. |
| | 1474 | */ |
| | 1475 | if (mode & FAXMODE_BYTEALIGN) { |
| | 1476 | int n = BitsAvail - (BitsAvail &~ 7); |
| | 1477 | ClrBits(n); |
| | 1478 | } else if (mode & FAXMODE_WORDALIGN) { |
| | 1479 | int n = BitsAvail - (BitsAvail &~ 15); |
| | 1480 | ClrBits(n); |
| | 1481 | if (BitsAvail == 0 && !isAligned(cp, uint16)) |
| | 1482 | cp++; |
| | 1483 | } |
| | 1484 | buf += sp->b.rowbytes; |
| | 1485 | occ -= sp->b.rowbytes; |
| | 1486 | continue; |
| | 1487 | EOFRLE: /* premature EOF */ |
| | 1488 | (*sp->fill)(buf, thisrun, pa, lastx); |
| | 1489 | UNCACHE_STATE(tif, sp); |
| | 1490 | return (-1); |
| | 1491 | } |
| | 1492 | UNCACHE_STATE(tif, sp); |
| | 1493 | return (1); |
| | 1494 | } |
| | 1495 | |
| | 1496 | int |
| | 1497 | TIFFInitCCITTRLE(TIFF* tif, int scheme) |
| | 1498 | { |
| | 1499 | if (InitCCITTFax3(tif)) { /* reuse G3 support */ |
| | 1500 | tif->tif_decoderow = Fax3DecodeRLE; |
| | 1501 | tif->tif_decodestrip = Fax3DecodeRLE; |
| | 1502 | tif->tif_decodetile = Fax3DecodeRLE; |
| | 1503 | /* |
| | 1504 | * Suppress RTC+EOLs when encoding and byte-align data. |
| | 1505 | */ |
| | 1506 | return TIFFSetField(tif, TIFFTAG_FAXMODE, |
| | 1507 | FAXMODE_NORTC|FAXMODE_NOEOL|FAXMODE_BYTEALIGN); |
| | 1508 | } else |
| | 1509 | return (0); |
| | 1510 | } |
| | 1511 | |
| | 1512 | int |
| | 1513 | TIFFInitCCITTRLEW(TIFF* tif, int scheme) |
| | 1514 | { |
| | 1515 | if (InitCCITTFax3(tif)) { /* reuse G3 support */ |
| | 1516 | tif->tif_decoderow = Fax3DecodeRLE; |
| | 1517 | tif->tif_decodestrip = Fax3DecodeRLE; |
| | 1518 | tif->tif_decodetile = Fax3DecodeRLE; |
| | 1519 | /* |
| | 1520 | * Suppress RTC+EOLs when encoding and word-align data. |
| | 1521 | */ |
| | 1522 | return TIFFSetField(tif, TIFFTAG_FAXMODE, |
| | 1523 | FAXMODE_NORTC|FAXMODE_NOEOL|FAXMODE_WORDALIGN); |
| | 1524 | } else |
| | 1525 | return (0); |
| | 1526 | } |
| | 1527 | #endif /* CCITT_SUPPORT */ |
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