| /* |
| * Copyright (c) 1990-1997 Sam Leffler |
| * Copyright (c) 1991-1997 Silicon Graphics, Inc. |
| * |
| * Permission to use, copy, modify, distribute, and sell this software and |
| * its documentation for any purpose is hereby granted without fee, provided |
| * that (i) the above copyright notices and this permission notice appear in |
| * all copies of the software and related documentation, and (ii) the names of |
| * Sam Leffler and Silicon Graphics may not be used in any advertising or |
| * publicity relating to the software without the specific, prior written |
| * permission of Sam Leffler and Silicon Graphics. |
| * |
| * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY |
| * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. |
| * |
| * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR |
| * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, |
| * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, |
| * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF |
| * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
| * OF THIS SOFTWARE. |
| */ |
| |
| #include "tiffiop.h" |
| #ifdef CCITT_SUPPORT |
| /* |
| * TIFF Library. |
| * |
| * CCITT Group 3 (T.4) and Group 4 (T.6) Compression Support. |
| * |
| * This file contains support for decoding and encoding TIFF |
| * compression algorithms 2, 3, 4, and 32771. |
| * |
| * Decoder support is derived, with permission, from the code |
| * in Frank Cringle's viewfax program; |
| * Copyright (C) 1990, 1995 Frank D. Cringle. |
| */ |
| #include "tif_fax3.h" |
| #define G3CODES |
| #include "t4.h" |
| #include <stdio.h> |
| |
| #ifndef EOF_REACHED_COUNT_THRESHOLD |
| /* Arbitrary threshold to avoid corrupted single-strip files with extremely |
| * large imageheight to cause apparently endless looping, such as in |
| * https://gitlab.com/libtiff/libtiff/-/issues/583 |
| */ |
| #define EOF_REACHED_COUNT_THRESHOLD 8192 |
| #endif |
| |
| /* |
| * Compression+decompression state blocks are |
| * derived from this ``base state'' block. |
| */ |
| typedef struct |
| { |
| int rw_mode; /* O_RDONLY for decode, else encode */ |
| int mode; /* operating mode */ |
| tmsize_t rowbytes; /* bytes in a decoded scanline */ |
| uint32_t rowpixels; /* pixels in a scanline */ |
| |
| uint16_t cleanfaxdata; /* CleanFaxData tag */ |
| uint32_t badfaxrun; /* BadFaxRun tag */ |
| uint32_t badfaxlines; /* BadFaxLines tag */ |
| uint32_t groupoptions; /* Group 3/4 options tag */ |
| |
| TIFFVGetMethod vgetparent; /* super-class method */ |
| TIFFVSetMethod vsetparent; /* super-class method */ |
| TIFFPrintMethod printdir; /* super-class method */ |
| } Fax3BaseState; |
| #define Fax3State(tif) ((Fax3BaseState *)(tif)->tif_data) |
| |
| typedef enum |
| { |
| G3_1D, |
| G3_2D |
| } Ttag; |
| typedef struct |
| { |
| Fax3BaseState b; |
| |
| /* Decoder state info */ |
| const unsigned char *bitmap; /* bit reversal table */ |
| uint32_t data; /* current i/o byte/word */ |
| int bit; /* current i/o bit in byte */ |
| int EOLcnt; /* count of EOL codes recognized */ |
| int eofReachedCount; /* number of times decode has been called with |
| EOF already reached */ |
| TIFFFaxFillFunc fill; /* fill routine */ |
| uint32_t *runs; /* b&w runs for current/previous row */ |
| uint32_t nruns; /* size of the refruns / curruns arrays */ |
| uint32_t *refruns; /* runs for reference line */ |
| uint32_t *curruns; /* runs for current line */ |
| |
| /* Encoder state info */ |
| Ttag tag; /* encoding state */ |
| unsigned char *refline; /* reference line for 2d decoding */ |
| int k; /* #rows left that can be 2d encoded */ |
| int maxk; /* max #rows that can be 2d encoded */ |
| |
| int line; |
| } Fax3CodecState; |
| #define DecoderState(tif) ((Fax3CodecState *)Fax3State(tif)) |
| #define EncoderState(tif) ((Fax3CodecState *)Fax3State(tif)) |
| |
| #define is2DEncoding(sp) (sp->b.groupoptions & GROUP3OPT_2DENCODING) |
| #define isAligned(p, t) ((((size_t)(p)) & (sizeof(t) - 1)) == 0) |
| |
| /* |
| * Group 3 and Group 4 Decoding. |
| */ |
| |
| /* |
| * These macros glue the TIFF library state to |
| * the state expected by Frank's decoder. |
| */ |
| #define DECLARE_STATE(tif, sp, mod) \ |
| static const char module[] = mod; \ |
| Fax3CodecState *sp = DecoderState(tif); \ |
| int a0; /* reference element */ \ |
| int lastx = sp->b.rowpixels; /* last element in row */ \ |
| uint32_t BitAcc; /* bit accumulator */ \ |
| int BitsAvail; /* # valid bits in BitAcc */ \ |
| int RunLength; /* length of current run */ \ |
| unsigned char *cp; /* next byte of input data */ \ |
| unsigned char *ep; /* end of input data */ \ |
| uint32_t *pa; /* place to stuff next run */ \ |
| uint32_t *thisrun; /* current row's run array */ \ |
| int EOLcnt; /* # EOL codes recognized */ \ |
| const unsigned char *bitmap = sp->bitmap; /* input data bit reverser */ \ |
| const TIFFFaxTabEnt *TabEnt |
| |
| #define DECLARE_STATE_2D(tif, sp, mod) \ |
| DECLARE_STATE(tif, sp, mod); \ |
| int b1; /* next change on prev line */ \ |
| uint32_t \ |
| *pb /* next run in reference line */ /* \ |
| * Load any state that may be \ |
| * changed during decoding. \ |
| */ |
| #define CACHE_STATE(tif, sp) \ |
| do \ |
| { \ |
| BitAcc = sp->data; \ |
| BitsAvail = sp->bit; \ |
| EOLcnt = sp->EOLcnt; \ |
| cp = (unsigned char *)tif->tif_rawcp; \ |
| ep = cp + tif->tif_rawcc; \ |
| } while (0) |
| /* |
| * Save state possibly changed during decoding. |
| */ |
| #define UNCACHE_STATE(tif, sp) \ |
| do \ |
| { \ |
| sp->bit = BitsAvail; \ |
| sp->data = BitAcc; \ |
| sp->EOLcnt = EOLcnt; \ |
| tif->tif_rawcc -= (tmsize_t)((uint8_t *)cp - tif->tif_rawcp); \ |
| tif->tif_rawcp = (uint8_t *)cp; \ |
| } while (0) |
| |
| /* |
| * Setup state for decoding a strip. |
| */ |
| static int Fax3PreDecode(TIFF *tif, uint16_t s) |
| { |
| Fax3CodecState *sp = DecoderState(tif); |
| |
| (void)s; |
| assert(sp != NULL); |
| sp->bit = 0; /* force initial read */ |
| sp->data = 0; |
| sp->EOLcnt = 0; /* force initial scan for EOL */ |
| sp->eofReachedCount = 0; |
| /* |
| * Decoder assumes lsb-to-msb bit order. Note that we select |
| * this here rather than in Fax3SetupState so that viewers can |
| * hold the image open, fiddle with the FillOrder tag value, |
| * and then re-decode the image. Otherwise they'd need to close |
| * and open the image to get the state reset. |
| */ |
| sp->bitmap = |
| TIFFGetBitRevTable(tif->tif_dir.td_fillorder != FILLORDER_LSB2MSB); |
| sp->curruns = sp->runs; |
| if (sp->refruns) |
| { /* init reference line to white */ |
| sp->refruns = sp->runs + sp->nruns; |
| sp->refruns[0] = (uint32_t)sp->b.rowpixels; |
| sp->refruns[1] = 0; |
| } |
| sp->line = 0; |
| return (1); |
| } |
| |
| /* |
| * Routine for handling various errors/conditions. |
| * Note how they are "glued into the decoder" by |
| * overriding the definitions used by the decoder. |
| */ |
| |
| static void Fax3Unexpected(const char *module, TIFF *tif, uint32_t line, |
| uint32_t a0) |
| { |
| TIFFErrorExtR(tif, module, |
| "Bad code word at line %" PRIu32 " of %s %" PRIu32 |
| " (x %" PRIu32 ")", |
| line, isTiled(tif) ? "tile" : "strip", |
| (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), a0); |
| } |
| #define unexpected(table, a0) Fax3Unexpected(module, tif, sp->line, a0) |
| |
| static void Fax3Extension(const char *module, TIFF *tif, uint32_t line, |
| uint32_t a0) |
| { |
| TIFFErrorExtR(tif, module, |
| "Uncompressed data (not supported) at line %" PRIu32 |
| " of %s %" PRIu32 " (x %" PRIu32 ")", |
| line, isTiled(tif) ? "tile" : "strip", |
| (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), a0); |
| } |
| #define extension(a0) Fax3Extension(module, tif, sp->line, a0) |
| |
| static void Fax3BadLength(const char *module, TIFF *tif, uint32_t line, |
| uint32_t a0, uint32_t lastx) |
| { |
| TIFFWarningExtR(tif, module, |
| "%s at line %" PRIu32 " of %s %" PRIu32 " (got %" PRIu32 |
| ", expected %" PRIu32 ")", |
| a0 < lastx ? "Premature EOL" : "Line length mismatch", line, |
| isTiled(tif) ? "tile" : "strip", |
| (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), a0, |
| lastx); |
| } |
| #define badlength(a0, lastx) Fax3BadLength(module, tif, sp->line, a0, lastx) |
| |
| static void Fax3PrematureEOF(const char *module, TIFF *tif, uint32_t line, |
| uint32_t a0) |
| { |
| TIFFWarningExtR(tif, module, |
| "Premature EOF at line %" PRIu32 " of %s %" PRIu32 |
| " (x %" PRIu32 ")", |
| line, isTiled(tif) ? "tile" : "strip", |
| (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), a0); |
| } |
| #define prematureEOF(a0) \ |
| do \ |
| { \ |
| Fax3PrematureEOF(module, tif, sp->line, a0); \ |
| ++sp->eofReachedCount; \ |
| } while (0) |
| |
| #define Nop |
| |
| /** |
| * Decode the requested amount of G3 1D-encoded data. |
| * @param buf destination buffer |
| * @param occ available bytes in destination buffer |
| * @param s number of planes (ignored) |
| * @returns 1 for success, -1 in case of error |
| */ |
| static int Fax3Decode1D(TIFF *tif, uint8_t *buf, tmsize_t occ, uint16_t s) |
| { |
| DECLARE_STATE(tif, sp, "Fax3Decode1D"); |
| (void)s; |
| if (occ % sp->b.rowbytes) |
| { |
| TIFFErrorExtR(tif, module, "Fractional scanlines cannot be read"); |
| return (-1); |
| } |
| if (sp->eofReachedCount >= EOF_REACHED_COUNT_THRESHOLD) |
| { |
| TIFFErrorExtR( |
| tif, module, |
| "End of file has already been reached %d times within that strip", |
| sp->eofReachedCount); |
| return (-1); |
| } |
| CACHE_STATE(tif, sp); |
| thisrun = sp->curruns; |
| while (occ > 0) |
| { |
| a0 = 0; |
| RunLength = 0; |
| pa = thisrun; |
| #ifdef FAX3_DEBUG |
| printf("\nBitAcc=%08" PRIX32 ", BitsAvail = %d\n", BitAcc, BitsAvail); |
| printf("-------------------- %" PRIu32 "\n", tif->tif_row); |
| fflush(stdout); |
| #endif |
| SYNC_EOL(EOF1D); |
| EXPAND1D(EOF1Da); |
| (*sp->fill)(buf, thisrun, pa, lastx); |
| buf += sp->b.rowbytes; |
| occ -= sp->b.rowbytes; |
| sp->line++; |
| continue; |
| EOF1D: /* premature EOF */ |
| CLEANUP_RUNS(); |
| EOF1Da: /* premature EOF */ |
| (*sp->fill)(buf, thisrun, pa, lastx); |
| UNCACHE_STATE(tif, sp); |
| return (-1); |
| } |
| UNCACHE_STATE(tif, sp); |
| return (1); |
| } |
| |
| #define SWAP(t, a, b) \ |
| { \ |
| t x; \ |
| x = (a); \ |
| (a) = (b); \ |
| (b) = x; \ |
| } |
| /* |
| * Decode the requested amount of G3 2D-encoded data. |
| */ |
| static int Fax3Decode2D(TIFF *tif, uint8_t *buf, tmsize_t occ, uint16_t s) |
| { |
| DECLARE_STATE_2D(tif, sp, "Fax3Decode2D"); |
| int is1D; /* current line is 1d/2d-encoded */ |
| (void)s; |
| if (occ % sp->b.rowbytes) |
| { |
| TIFFErrorExtR(tif, module, "Fractional scanlines cannot be read"); |
| return (-1); |
| } |
| if (sp->eofReachedCount >= EOF_REACHED_COUNT_THRESHOLD) |
| { |
| TIFFErrorExtR( |
| tif, module, |
| "End of file has already been reached %d times within that strip", |
| sp->eofReachedCount); |
| return (-1); |
| } |
| CACHE_STATE(tif, sp); |
| while (occ > 0) |
| { |
| a0 = 0; |
| RunLength = 0; |
| pa = thisrun = sp->curruns; |
| #ifdef FAX3_DEBUG |
| printf("\nBitAcc=%08" PRIX32 ", BitsAvail = %d EOLcnt = %d", BitAcc, |
| BitsAvail, EOLcnt); |
| #endif |
| SYNC_EOL(EOF2D); |
| NeedBits8(1, EOF2D); |
| is1D = GetBits(1); /* 1D/2D-encoding tag bit */ |
| ClrBits(1); |
| #ifdef FAX3_DEBUG |
| printf(" %s\n-------------------- %" PRIu32 "\n", is1D ? "1D" : "2D", |
| tif->tif_row); |
| fflush(stdout); |
| #endif |
| pb = sp->refruns; |
| b1 = *pb++; |
| if (is1D) |
| EXPAND1D(EOF2Da); |
| else |
| EXPAND2D(EOF2Da); |
| (*sp->fill)(buf, thisrun, pa, lastx); |
| if (pa < thisrun + sp->nruns) |
| { |
| SETVALUE(0); /* imaginary change for reference */ |
| } |
| SWAP(uint32_t *, sp->curruns, sp->refruns); |
| buf += sp->b.rowbytes; |
| occ -= sp->b.rowbytes; |
| sp->line++; |
| continue; |
| EOF2D: /* premature EOF */ |
| CLEANUP_RUNS(); |
| EOF2Da: /* premature EOF */ |
| (*sp->fill)(buf, thisrun, pa, lastx); |
| UNCACHE_STATE(tif, sp); |
| return (-1); |
| } |
| UNCACHE_STATE(tif, sp); |
| return (1); |
| } |
| #undef SWAP |
| |
| #define FILL(n, cp) \ |
| for (int32_t ifill = 0; ifill < (n); ++ifill) \ |
| { \ |
| (cp)[ifill] = 0xff; \ |
| } \ |
| (cp) += (n); |
| |
| #define ZERO(n, cp) \ |
| for (int32_t izero = 0; izero < (n); ++izero) \ |
| { \ |
| (cp)[izero] = 0; \ |
| } \ |
| (cp) += (n); |
| |
| /* |
| * Bit-fill a row according to the white/black |
| * runs generated during G3/G4 decoding. |
| */ |
| void _TIFFFax3fillruns(unsigned char *buf, uint32_t *runs, uint32_t *erun, |
| uint32_t lastx) |
| { |
| static const unsigned char _fillmasks[] = {0x00, 0x80, 0xc0, 0xe0, 0xf0, |
| 0xf8, 0xfc, 0xfe, 0xff}; |
| unsigned char *cp; |
| uint32_t x, bx, run; |
| int32_t n, nw; |
| int64_t *lp; |
| |
| if ((erun - runs) & 1) |
| *erun++ = 0; |
| x = 0; |
| for (; runs < erun; runs += 2) |
| { |
| run = runs[0]; |
| if (x + run > lastx || run > lastx) |
| run = runs[0] = (uint32_t)(lastx - x); |
| if (run) |
| { |
| cp = buf + (x >> 3); |
| bx = x & 7; |
| if (run > 8 - bx) |
| { |
| if (bx) |
| { /* align to byte boundary */ |
| *cp++ &= 0xff << (8 - bx); |
| run -= 8 - bx; |
| } |
| if ((n = run >> 3) != 0) |
| { /* multiple bytes to fill */ |
| if ((n / sizeof(int64_t)) > 1) |
| { |
| /* |
| * Align to int64_tword boundary and fill. |
| */ |
| for (; n && !isAligned(cp, int64_t); n--) |
| *cp++ = 0x00; |
| lp = (int64_t *)cp; |
| nw = (int32_t)(n / sizeof(int64_t)); |
| n -= nw * sizeof(int64_t); |
| do |
| { |
| *lp++ = 0L; |
| } while (--nw); |
| cp = (unsigned char *)lp; |
| } |
| ZERO(n, cp); |
| run &= 7; |
| } |
| if (run) |
| cp[0] &= 0xff >> run; |
| } |
| else |
| cp[0] &= ~(_fillmasks[run] >> bx); |
| x += runs[0]; |
| } |
| run = runs[1]; |
| if (x + run > lastx || run > lastx) |
| run = runs[1] = lastx - x; |
| if (run) |
| { |
| cp = buf + (x >> 3); |
| bx = x & 7; |
| if (run > 8 - bx) |
| { |
| if (bx) |
| { /* align to byte boundary */ |
| *cp++ |= 0xff >> bx; |
| run -= 8 - bx; |
| } |
| if ((n = run >> 3) != 0) |
| { /* multiple bytes to fill */ |
| if ((n / sizeof(int64_t)) > 1) |
| { |
| /* |
| * Align to int64_t boundary and fill. |
| */ |
| for (; n && !isAligned(cp, int64_t); n--) |
| *cp++ = 0xff; |
| lp = (int64_t *)cp; |
| nw = (int32_t)(n / sizeof(int64_t)); |
| n -= nw * sizeof(int64_t); |
| do |
| { |
| *lp++ = -1L; |
| } while (--nw); |
| cp = (unsigned char *)lp; |
| } |
| FILL(n, cp); |
| run &= 7; |
| } |
| /* Explicit 0xff masking to make icc -check=conversions happy */ |
| if (run) |
| cp[0] = (unsigned char)((cp[0] | (0xff00 >> run)) & 0xff); |
| } |
| else |
| cp[0] |= _fillmasks[run] >> bx; |
| x += runs[1]; |
| } |
| } |
| assert(x == lastx); |
| } |
| #undef ZERO |
| #undef FILL |
| |
| static int Fax3FixupTags(TIFF *tif) |
| { |
| (void)tif; |
| return (1); |
| } |
| |
| /* |
| * Setup G3/G4-related compression/decompression state |
| * before data is processed. This routine is called once |
| * per image -- it sets up different state based on whether |
| * or not decoding or encoding is being done and whether |
| * 1D- or 2D-encoded data is involved. |
| */ |
| static int Fax3SetupState(TIFF *tif) |
| { |
| static const char module[] = "Fax3SetupState"; |
| TIFFDirectory *td = &tif->tif_dir; |
| Fax3BaseState *sp = Fax3State(tif); |
| int needsRefLine; |
| Fax3CodecState *dsp = (Fax3CodecState *)Fax3State(tif); |
| tmsize_t rowbytes; |
| uint32_t rowpixels; |
| |
| if (td->td_bitspersample != 1) |
| { |
| TIFFErrorExtR(tif, module, |
| "Bits/sample must be 1 for Group 3/4 encoding/decoding"); |
| return (0); |
| } |
| /* |
| * Calculate the scanline/tile widths. |
| */ |
| if (isTiled(tif)) |
| { |
| rowbytes = TIFFTileRowSize(tif); |
| rowpixels = td->td_tilewidth; |
| } |
| else |
| { |
| rowbytes = TIFFScanlineSize(tif); |
| rowpixels = td->td_imagewidth; |
| } |
| if ((int64_t)rowbytes < ((int64_t)rowpixels + 7) / 8) |
| { |
| TIFFErrorExtR(tif, module, |
| "Inconsistent number of bytes per row : rowbytes=%" PRId64 |
| " rowpixels=%" PRIu32, |
| (int64_t)rowbytes, rowpixels); |
| return (0); |
| } |
| sp->rowbytes = rowbytes; |
| sp->rowpixels = rowpixels; |
| /* |
| * Allocate any additional space required for decoding/encoding. |
| */ |
| needsRefLine = ((sp->groupoptions & GROUP3OPT_2DENCODING) || |
| td->td_compression == COMPRESSION_CCITTFAX4); |
| |
| /* |
| Assure that allocation computations do not overflow. |
| |
| TIFFroundup and TIFFSafeMultiply return zero on integer overflow |
| */ |
| if (dsp->runs != NULL) |
| { |
| _TIFFfreeExt(tif, dsp->runs); |
| dsp->runs = (uint32_t *)NULL; |
| } |
| dsp->nruns = TIFFroundup_32(rowpixels + 1, 32); |
| if (needsRefLine) |
| { |
| dsp->nruns = TIFFSafeMultiply(uint32_t, dsp->nruns, 2); |
| } |
| if ((dsp->nruns == 0) || (TIFFSafeMultiply(uint32_t, dsp->nruns, 2) == 0)) |
| { |
| TIFFErrorExtR(tif, tif->tif_name, |
| "Row pixels integer overflow (rowpixels %" PRIu32 ")", |
| rowpixels); |
| return (0); |
| } |
| dsp->runs = (uint32_t *)_TIFFCheckMalloc( |
| tif, TIFFSafeMultiply(uint32_t, dsp->nruns, 2), sizeof(uint32_t), |
| "for Group 3/4 run arrays"); |
| if (dsp->runs == NULL) |
| return (0); |
| memset(dsp->runs, 0, |
| TIFFSafeMultiply(uint32_t, dsp->nruns, 2) * sizeof(uint32_t)); |
| dsp->curruns = dsp->runs; |
| if (needsRefLine) |
| dsp->refruns = dsp->runs + dsp->nruns; |
| else |
| dsp->refruns = NULL; |
| if (td->td_compression == COMPRESSION_CCITTFAX3 && is2DEncoding(dsp)) |
| { /* NB: default is 1D routine */ |
| tif->tif_decoderow = Fax3Decode2D; |
| tif->tif_decodestrip = Fax3Decode2D; |
| tif->tif_decodetile = Fax3Decode2D; |
| } |
| |
| if (needsRefLine) |
| { /* 2d encoding */ |
| Fax3CodecState *esp = EncoderState(tif); |
| /* |
| * 2d encoding requires a scanline |
| * buffer for the ``reference line''; the |
| * scanline against which delta encoding |
| * is referenced. The reference line must |
| * be initialized to be ``white'' (done elsewhere). |
| */ |
| if (esp->refline != NULL) |
| { |
| _TIFFfreeExt(tif, esp->refline); |
| } |
| esp->refline = (unsigned char *)_TIFFmallocExt(tif, rowbytes); |
| if (esp->refline == NULL) |
| { |
| TIFFErrorExtR(tif, module, "No space for Group 3/4 reference line"); |
| return (0); |
| } |
| } |
| else /* 1d encoding */ |
| EncoderState(tif)->refline = NULL; |
| |
| return (1); |
| } |
| |
| /* |
| * CCITT Group 3 FAX Encoding. |
| */ |
| |
| #define Fax3FlushBits(tif, sp) \ |
| { \ |
| if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \ |
| { \ |
| if (!TIFFFlushData1(tif)) \ |
| return 0; \ |
| } \ |
| *(tif)->tif_rawcp++ = (uint8_t)(sp)->data; \ |
| (tif)->tif_rawcc++; \ |
| (sp)->data = 0, (sp)->bit = 8; \ |
| } |
| #define _FlushBits(tif) \ |
| { \ |
| if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \ |
| { \ |
| if (!TIFFFlushData1(tif)) \ |
| return 0; \ |
| } \ |
| *(tif)->tif_rawcp++ = (uint8_t)data; \ |
| (tif)->tif_rawcc++; \ |
| data = 0, bit = 8; \ |
| } |
| static const int _msbmask[9] = {0x00, 0x01, 0x03, 0x07, 0x0f, |
| 0x1f, 0x3f, 0x7f, 0xff}; |
| #define _PutBits(tif, bits, length) \ |
| { \ |
| while (length > bit) \ |
| { \ |
| data |= bits >> (length - bit); \ |
| length -= bit; \ |
| _FlushBits(tif); \ |
| } \ |
| assert(length < 9); \ |
| data |= (bits & _msbmask[length]) << (bit - length); \ |
| bit -= length; \ |
| if (bit == 0) \ |
| _FlushBits(tif); \ |
| } |
| |
| /* |
| * Write a variable-length bit-value to |
| * the output stream. Values are |
| * assumed to be at most 16 bits. |
| */ |
| static int Fax3PutBits(TIFF *tif, unsigned int bits, unsigned int length) |
| { |
| Fax3CodecState *sp = EncoderState(tif); |
| unsigned int bit = sp->bit; |
| int data = sp->data; |
| |
| _PutBits(tif, bits, length); |
| |
| sp->data = data; |
| sp->bit = bit; |
| return 1; |
| } |
| |
| /* |
| * Write a code to the output stream. |
| */ |
| #define putcode(tif, te) Fax3PutBits(tif, (te)->code, (te)->length) |
| |
| #ifdef FAX3_DEBUG |
| #define DEBUG_COLOR(w) (tab == TIFFFaxWhiteCodes ? w "W" : w "B") |
| #define DEBUG_PRINT(what, len) \ |
| { \ |
| int t; \ |
| printf("%08" PRIX32 "/%-2d: %s%5d\t", data, bit, DEBUG_COLOR(what), \ |
| len); \ |
| for (t = length - 1; t >= 0; t--) \ |
| putchar(code & (1 << t) ? '1' : '0'); \ |
| putchar('\n'); \ |
| } |
| #endif |
| |
| /* |
| * Write the sequence of codes that describes |
| * the specified span of zero's or one's. The |
| * appropriate table that holds the make-up and |
| * terminating codes is supplied. |
| */ |
| static int putspan(TIFF *tif, int32_t span, const tableentry *tab) |
| { |
| Fax3CodecState *sp = EncoderState(tif); |
| unsigned int bit = sp->bit; |
| int data = sp->data; |
| unsigned int code, length; |
| |
| while (span >= 2624) |
| { |
| const tableentry *te = &tab[63 + (2560 >> 6)]; |
| code = te->code; |
| length = te->length; |
| #ifdef FAX3_DEBUG |
| DEBUG_PRINT("MakeUp", te->runlen); |
| #endif |
| _PutBits(tif, code, length); |
| span -= te->runlen; |
| } |
| if (span >= 64) |
| { |
| const tableentry *te = &tab[63 + (span >> 6)]; |
| assert(te->runlen == 64 * (span >> 6)); |
| code = te->code; |
| length = te->length; |
| #ifdef FAX3_DEBUG |
| DEBUG_PRINT("MakeUp", te->runlen); |
| #endif |
| _PutBits(tif, code, length); |
| span -= te->runlen; |
| } |
| code = tab[span].code; |
| length = tab[span].length; |
| #ifdef FAX3_DEBUG |
| DEBUG_PRINT(" Term", tab[span].runlen); |
| #endif |
| _PutBits(tif, code, length); |
| |
| sp->data = data; |
| sp->bit = bit; |
| |
| return 1; |
| } |
| |
| /* |
| * Write an EOL code to the output stream. The zero-fill |
| * logic for byte-aligning encoded scanlines is handled |
| * here. We also handle writing the tag bit for the next |
| * scanline when doing 2d encoding. |
| */ |
| static int Fax3PutEOL(TIFF *tif) |
| { |
| Fax3CodecState *sp = EncoderState(tif); |
| unsigned int bit = sp->bit; |
| int data = sp->data; |
| unsigned int code, length, tparm; |
| |
| if (sp->b.groupoptions & GROUP3OPT_FILLBITS) |
| { |
| /* |
| * Force bit alignment so EOL will terminate on |
| * a byte boundary. That is, force the bit alignment |
| * to 16-12 = 4 before putting out the EOL code. |
| */ |
| int align = 8 - 4; |
| if (align != sp->bit) |
| { |
| if (align > sp->bit) |
| align = sp->bit + (8 - align); |
| else |
| align = sp->bit - align; |
| tparm = align; |
| _PutBits(tif, 0, tparm); |
| } |
| } |
| code = EOL; |
| length = 12; |
| if (is2DEncoding(sp)) |
| { |
| code = (code << 1) | (sp->tag == G3_1D); |
| length++; |
| } |
| _PutBits(tif, code, length); |
| |
| sp->data = data; |
| sp->bit = bit; |
| |
| return 1; |
| } |
| |
| /* |
| * Reset encoding state at the start of a strip. |
| */ |
| static int Fax3PreEncode(TIFF *tif, uint16_t s) |
| { |
| Fax3CodecState *sp = EncoderState(tif); |
| |
| (void)s; |
| assert(sp != NULL); |
| sp->bit = 8; |
| sp->data = 0; |
| sp->tag = G3_1D; |
| /* |
| * This is necessary for Group 4; otherwise it isn't |
| * needed because the first scanline of each strip ends |
| * up being copied into the refline. |
| */ |
| if (sp->refline) |
| _TIFFmemset(sp->refline, 0x00, sp->b.rowbytes); |
| if (is2DEncoding(sp)) |
| { |
| float res = tif->tif_dir.td_yresolution; |
| /* |
| * The CCITT spec says that when doing 2d encoding, you |
| * should only do it on K consecutive scanlines, where K |
| * depends on the resolution of the image being encoded |
| * (2 for <= 200 lpi, 4 for > 200 lpi). Since the directory |
| * code initializes td_yresolution to 0, this code will |
| * select a K of 2 unless the YResolution tag is set |
| * appropriately. (Note also that we fudge a little here |
| * and use 150 lpi to avoid problems with units conversion.) |
| */ |
| if (tif->tif_dir.td_resolutionunit == RESUNIT_CENTIMETER) |
| res *= 2.54f; /* convert to inches */ |
| sp->maxk = (res > 150 ? 4 : 2); |
| sp->k = sp->maxk - 1; |
| } |
| else |
| sp->k = sp->maxk = 0; |
| sp->line = 0; |
| return (1); |
| } |
| |
| static const unsigned char zeroruns[256] = { |
| 8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, /* 0x00 - 0x0f */ |
| 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0x10 - 0x1f */ |
| 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x20 - 0x2f */ |
| 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x30 - 0x3f */ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x40 - 0x4f */ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x50 - 0x5f */ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x60 - 0x6f */ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x70 - 0x7f */ |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x80 - 0x8f */ |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x90 - 0x9f */ |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xa0 - 0xaf */ |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xb0 - 0xbf */ |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xc0 - 0xcf */ |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xd0 - 0xdf */ |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xe0 - 0xef */ |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xf0 - 0xff */ |
| }; |
| static const unsigned char oneruns[256] = { |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x00 - 0x0f */ |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x10 - 0x1f */ |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x20 - 0x2f */ |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x30 - 0x3f */ |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x40 - 0x4f */ |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x50 - 0x5f */ |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x60 - 0x6f */ |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x70 - 0x7f */ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x80 - 0x8f */ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x90 - 0x9f */ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xa0 - 0xaf */ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xb0 - 0xbf */ |
| 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xc0 - 0xcf */ |
| 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xd0 - 0xdf */ |
| 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0xe0 - 0xef */ |
| 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 8, /* 0xf0 - 0xff */ |
| }; |
| |
| /* |
| * Find a span of ones or zeros using the supplied |
| * table. The ``base'' of the bit string is supplied |
| * along with the start+end bit indices. |
| */ |
| static inline int32_t find0span(unsigned char *bp, int32_t bs, int32_t be) |
| { |
| int32_t bits = be - bs; |
| int32_t n, span; |
| |
| bp += bs >> 3; |
| /* |
| * Check partial byte on lhs. |
| */ |
| if (bits > 0 && (n = (bs & 7)) != 0) |
| { |
| span = zeroruns[(*bp << n) & 0xff]; |
| if (span > 8 - n) /* table value too generous */ |
| span = 8 - n; |
| if (span > bits) /* constrain span to bit range */ |
| span = bits; |
| if (n + span < 8) /* doesn't extend to edge of byte */ |
| return (span); |
| bits -= span; |
| bp++; |
| } |
| else |
| span = 0; |
| if (bits >= (int32_t)(2 * 8 * sizeof(int64_t))) |
| { |
| int64_t *lp; |
| /* |
| * Align to int64_t boundary and check int64_t words. |
| */ |
| while (!isAligned(bp, int64_t)) |
| { |
| if (*bp != 0x00) |
| return (span + zeroruns[*bp]); |
| span += 8; |
| bits -= 8; |
| bp++; |
| } |
| lp = (int64_t *)bp; |
| while ((bits >= (int32_t)(8 * sizeof(int64_t))) && (0 == *lp)) |
| { |
| span += 8 * sizeof(int64_t); |
| bits -= 8 * sizeof(int64_t); |
| lp++; |
| } |
| bp = (unsigned char *)lp; |
| } |
| /* |
| * Scan full bytes for all 0's. |
| */ |
| while (bits >= 8) |
| { |
| if (*bp != 0x00) /* end of run */ |
| return (span + zeroruns[*bp]); |
| span += 8; |
| bits -= 8; |
| bp++; |
| } |
| /* |
| * Check partial byte on rhs. |
| */ |
| if (bits > 0) |
| { |
| n = zeroruns[*bp]; |
| span += (n > bits ? bits : n); |
| } |
| return (span); |
| } |
| |
| static inline int32_t find1span(unsigned char *bp, int32_t bs, int32_t be) |
| { |
| int32_t bits = be - bs; |
| int32_t n, span; |
| |
| bp += bs >> 3; |
| /* |
| * Check partial byte on lhs. |
| */ |
| if (bits > 0 && (n = (bs & 7)) != 0) |
| { |
| span = oneruns[(*bp << n) & 0xff]; |
| if (span > 8 - n) /* table value too generous */ |
| span = 8 - n; |
| if (span > bits) /* constrain span to bit range */ |
| span = bits; |
| if (n + span < 8) /* doesn't extend to edge of byte */ |
| return (span); |
| bits -= span; |
| bp++; |
| } |
| else |
| span = 0; |
| if (bits >= (int32_t)(2 * 8 * sizeof(int64_t))) |
| { |
| int64_t *lp; |
| /* |
| * Align to int64_t boundary and check int64_t words. |
| */ |
| while (!isAligned(bp, int64_t)) |
| { |
| if (*bp != 0xff) |
| return (span + oneruns[*bp]); |
| span += 8; |
| bits -= 8; |
| bp++; |
| } |
| lp = (int64_t *)bp; |
| while ((bits >= (int32_t)(8 * sizeof(int64_t))) && |
| (~((uint64_t)0) == (uint64_t)*lp)) |
| { |
| span += 8 * sizeof(int64_t); |
| bits -= 8 * sizeof(int64_t); |
| lp++; |
| } |
| bp = (unsigned char *)lp; |
| } |
| /* |
| * Scan full bytes for all 1's. |
| */ |
| while (bits >= 8) |
| { |
| if (*bp != 0xff) /* end of run */ |
| return (span + oneruns[*bp]); |
| span += 8; |
| bits -= 8; |
| bp++; |
| } |
| /* |
| * Check partial byte on rhs. |
| */ |
| if (bits > 0) |
| { |
| n = oneruns[*bp]; |
| span += (n > bits ? bits : n); |
| } |
| return (span); |
| } |
| |
| /* |
| * Return the offset of the next bit in the range |
| * [bs..be] that is different from the specified |
| * color. The end, be, is returned if no such bit |
| * exists. |
| */ |
| #define finddiff(_cp, _bs, _be, _color) \ |
| (_bs + (_color ? find1span(_cp, _bs, _be) : find0span(_cp, _bs, _be))) |
| /* |
| * Like finddiff, but also check the starting bit |
| * against the end in case start > end. |
| */ |
| #define finddiff2(_cp, _bs, _be, _color) \ |
| (_bs < _be ? finddiff(_cp, _bs, _be, _color) : _be) |
| |
| /* |
| * 1d-encode a row of pixels. The encoding is |
| * a sequence of all-white or all-black spans |
| * of pixels encoded with Huffman codes. |
| */ |
| static int Fax3Encode1DRow(TIFF *tif, unsigned char *bp, uint32_t bits) |
| { |
| Fax3CodecState *sp = EncoderState(tif); |
| int32_t span; |
| uint32_t bs = 0; |
| |
| for (;;) |
| { |
| span = find0span(bp, bs, bits); /* white span */ |
| if (!putspan(tif, span, TIFFFaxWhiteCodes)) |
| return 0; |
| bs += span; |
| if (bs >= bits) |
| break; |
| span = find1span(bp, bs, bits); /* black span */ |
| if (!putspan(tif, span, TIFFFaxBlackCodes)) |
| return 0; |
| bs += span; |
| if (bs >= bits) |
| break; |
| } |
| if (sp->b.mode & (FAXMODE_BYTEALIGN | FAXMODE_WORDALIGN)) |
| { |
| if (sp->bit != 8) /* byte-align */ |
| Fax3FlushBits(tif, sp); |
| if ((sp->b.mode & FAXMODE_WORDALIGN) && |
| !isAligned(tif->tif_rawcp, uint16_t)) |
| Fax3FlushBits(tif, sp); |
| } |
| return (1); |
| } |
| |
| static const tableentry horizcode = {3, 0x1, 0}; /* 001 */ |
| static const tableentry passcode = {4, 0x1, 0}; /* 0001 */ |
| static const tableentry vcodes[7] = { |
| {7, 0x03, 0}, /* 0000 011 */ |
| {6, 0x03, 0}, /* 0000 11 */ |
| {3, 0x03, 0}, /* 011 */ |
| {1, 0x1, 0}, /* 1 */ |
| {3, 0x2, 0}, /* 010 */ |
| {6, 0x02, 0}, /* 0000 10 */ |
| {7, 0x02, 0} /* 0000 010 */ |
| }; |
| |
| /* |
| * 2d-encode a row of pixels. Consult the CCITT |
| * documentation for the algorithm. |
| */ |
| static int Fax3Encode2DRow(TIFF *tif, unsigned char *bp, unsigned char *rp, |
| uint32_t bits) |
| { |
| #define PIXEL(buf, ix) ((((buf)[(ix) >> 3]) >> (7 - ((ix)&7))) & 1) |
| uint32_t a0 = 0; |
| uint32_t a1 = (PIXEL(bp, 0) != 0 ? 0 : finddiff(bp, 0, bits, 0)); |
| uint32_t b1 = (PIXEL(rp, 0) != 0 ? 0 : finddiff(rp, 0, bits, 0)); |
| uint32_t a2, b2; |
| |
| for (;;) |
| { |
| b2 = finddiff2(rp, b1, bits, PIXEL(rp, b1)); |
| if (b2 >= a1) |
| { |
| /* Naive computation triggers |
| * -fsanitize=undefined,unsigned-integer-overflow */ |
| /* although it is correct unless the difference between both is < 31 |
| * bit */ |
| /* int32_t d = b1 - a1; */ |
| int32_t d = (b1 >= a1 && b1 - a1 <= 3U) ? (int32_t)(b1 - a1) |
| : (b1 < a1 && a1 - b1 <= 3U) ? -(int32_t)(a1 - b1) |
| : 0x7FFFFFFF; |
| if (!(-3 <= d && d <= 3)) |
| { /* horizontal mode */ |
| a2 = finddiff2(bp, a1, bits, PIXEL(bp, a1)); |
| if (!putcode(tif, &horizcode)) |
| return 0; |
| if (a0 + a1 == 0 || PIXEL(bp, a0) == 0) |
| { |
| if (!putspan(tif, a1 - a0, TIFFFaxWhiteCodes)) |
| return 0; |
| if (!putspan(tif, a2 - a1, TIFFFaxBlackCodes)) |
| return 0; |
| } |
| else |
| { |
| if (!putspan(tif, a1 - a0, TIFFFaxBlackCodes)) |
| return 0; |
| if (!putspan(tif, a2 - a1, TIFFFaxWhiteCodes)) |
| return 0; |
| } |
| a0 = a2; |
| } |
| else |
| { /* vertical mode */ |
| if (!putcode(tif, &vcodes[d + 3])) |
| return 0; |
| a0 = a1; |
| } |
| } |
| else |
| { /* pass mode */ |
| if (!putcode(tif, &passcode)) |
| return 0; |
| a0 = b2; |
| } |
| if (a0 >= bits) |
| break; |
| a1 = finddiff(bp, a0, bits, PIXEL(bp, a0)); |
| b1 = finddiff(rp, a0, bits, !PIXEL(bp, a0)); |
| b1 = finddiff(rp, b1, bits, PIXEL(bp, a0)); |
| } |
| return (1); |
| #undef PIXEL |
| } |
| |
| /* |
| * Encode a buffer of pixels. |
| */ |
| static int Fax3Encode(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s) |
| { |
| static const char module[] = "Fax3Encode"; |
| Fax3CodecState *sp = EncoderState(tif); |
| (void)s; |
| if (cc % sp->b.rowbytes) |
| { |
| TIFFErrorExtR(tif, module, "Fractional scanlines cannot be written"); |
| return (0); |
| } |
| while (cc > 0) |
| { |
| if ((sp->b.mode & FAXMODE_NOEOL) == 0) |
| { |
| if (!Fax3PutEOL(tif)) |
| return 0; |
| } |
| if (is2DEncoding(sp)) |
| { |
| if (sp->tag == G3_1D) |
| { |
| if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels)) |
| return (0); |
| sp->tag = G3_2D; |
| } |
| else |
| { |
| if (!Fax3Encode2DRow(tif, bp, sp->refline, sp->b.rowpixels)) |
| return (0); |
| sp->k--; |
| } |
| if (sp->k == 0) |
| { |
| sp->tag = G3_1D; |
| sp->k = sp->maxk - 1; |
| } |
| else |
| _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes); |
| } |
| else |
| { |
| if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels)) |
| return (0); |
| } |
| bp += sp->b.rowbytes; |
| cc -= sp->b.rowbytes; |
| } |
| return (1); |
| } |
| |
| static int Fax3PostEncode(TIFF *tif) |
| { |
| Fax3CodecState *sp = EncoderState(tif); |
| |
| if (sp->bit != 8) |
| Fax3FlushBits(tif, sp); |
| return (1); |
| } |
| |
| static int _Fax3Close(TIFF *tif) |
| { |
| if ((Fax3State(tif)->mode & FAXMODE_NORTC) == 0 && tif->tif_rawcp) |
| { |
| Fax3CodecState *sp = EncoderState(tif); |
| unsigned int code = EOL; |
| unsigned int length = 12; |
| int i; |
| |
| if (is2DEncoding(sp)) |
| { |
| code = (code << 1) | (sp->tag == G3_1D); |
| length++; |
| } |
| for (i = 0; i < 6; i++) |
| Fax3PutBits(tif, code, length); |
| Fax3FlushBits(tif, sp); |
| } |
| return 1; |
| } |
| |
| static void Fax3Close(TIFF *tif) { _Fax3Close(tif); } |
| |
| static void Fax3Cleanup(TIFF *tif) |
| { |
| Fax3CodecState *sp = DecoderState(tif); |
| |
| assert(sp != 0); |
| |
| tif->tif_tagmethods.vgetfield = sp->b.vgetparent; |
| tif->tif_tagmethods.vsetfield = sp->b.vsetparent; |
| tif->tif_tagmethods.printdir = sp->b.printdir; |
| |
| if (sp->runs) |
| _TIFFfreeExt(tif, sp->runs); |
| if (sp->refline) |
| _TIFFfreeExt(tif, sp->refline); |
| |
| _TIFFfreeExt(tif, tif->tif_data); |
| tif->tif_data = NULL; |
| |
| _TIFFSetDefaultCompressionState(tif); |
| } |
| |
| #define FIELD_BADFAXLINES (FIELD_CODEC + 0) |
| #define FIELD_CLEANFAXDATA (FIELD_CODEC + 1) |
| #define FIELD_BADFAXRUN (FIELD_CODEC + 2) |
| |
| #define FIELD_OPTIONS (FIELD_CODEC + 7) |
| |
| static const TIFFField faxFields[] = { |
| {TIFFTAG_FAXMODE, 0, 0, TIFF_ANY, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, |
| FIELD_PSEUDO, FALSE, FALSE, "FaxMode", NULL}, |
| {TIFFTAG_FAXFILLFUNC, 0, 0, TIFF_ANY, 0, TIFF_SETGET_OTHER, |
| TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, FALSE, FALSE, "FaxFillFunc", NULL}, |
| {TIFFTAG_BADFAXLINES, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32, |
| TIFF_SETGET_UINT32, FIELD_BADFAXLINES, TRUE, FALSE, "BadFaxLines", NULL}, |
| {TIFFTAG_CLEANFAXDATA, 1, 1, TIFF_SHORT, 0, TIFF_SETGET_UINT16, |
| TIFF_SETGET_UINT16, FIELD_CLEANFAXDATA, TRUE, FALSE, "CleanFaxData", NULL}, |
| {TIFFTAG_CONSECUTIVEBADFAXLINES, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32, |
| TIFF_SETGET_UINT32, FIELD_BADFAXRUN, TRUE, FALSE, "ConsecutiveBadFaxLines", |
| NULL}}; |
| static const TIFFField fax3Fields[] = { |
| {TIFFTAG_GROUP3OPTIONS, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32, |
| TIFF_SETGET_UINT32, FIELD_OPTIONS, FALSE, FALSE, "Group3Options", NULL}, |
| }; |
| static const TIFFField fax4Fields[] = { |
| {TIFFTAG_GROUP4OPTIONS, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32, |
| TIFF_SETGET_UINT32, FIELD_OPTIONS, FALSE, FALSE, "Group4Options", NULL}, |
| }; |
| |
| static int Fax3VSetField(TIFF *tif, uint32_t tag, va_list ap) |
| { |
| Fax3BaseState *sp = Fax3State(tif); |
| const TIFFField *fip; |
| |
| assert(sp != 0); |
| assert(sp->vsetparent != 0); |
| |
| switch (tag) |
| { |
| case TIFFTAG_FAXMODE: |
| sp->mode = (int)va_arg(ap, int); |
| return 1; /* NB: pseudo tag */ |
| case TIFFTAG_FAXFILLFUNC: |
| DecoderState(tif)->fill = va_arg(ap, TIFFFaxFillFunc); |
| return 1; /* NB: pseudo tag */ |
| case TIFFTAG_GROUP3OPTIONS: |
| /* XXX: avoid reading options if compression mismatches. */ |
| if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX3) |
| sp->groupoptions = (uint32_t)va_arg(ap, uint32_t); |
| break; |
| case TIFFTAG_GROUP4OPTIONS: |
| /* XXX: avoid reading options if compression mismatches. */ |
| if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4) |
| sp->groupoptions = (uint32_t)va_arg(ap, uint32_t); |
| break; |
| case TIFFTAG_BADFAXLINES: |
| sp->badfaxlines = (uint32_t)va_arg(ap, uint32_t); |
| break; |
| case TIFFTAG_CLEANFAXDATA: |
| sp->cleanfaxdata = (uint16_t)va_arg(ap, uint16_vap); |
| break; |
| case TIFFTAG_CONSECUTIVEBADFAXLINES: |
| sp->badfaxrun = (uint32_t)va_arg(ap, uint32_t); |
| break; |
| default: |
| return (*sp->vsetparent)(tif, tag, ap); |
| } |
| |
| if ((fip = TIFFFieldWithTag(tif, tag)) != NULL) |
| TIFFSetFieldBit(tif, fip->field_bit); |
| else |
| return 0; |
| |
| tif->tif_flags |= TIFF_DIRTYDIRECT; |
| return 1; |
| } |
| |
| static int Fax3VGetField(TIFF *tif, uint32_t tag, va_list ap) |
| { |
| Fax3BaseState *sp = Fax3State(tif); |
| |
| assert(sp != 0); |
| |
| switch (tag) |
| { |
| case TIFFTAG_FAXMODE: |
| *va_arg(ap, int *) = sp->mode; |
| break; |
| case TIFFTAG_FAXFILLFUNC: |
| *va_arg(ap, TIFFFaxFillFunc *) = DecoderState(tif)->fill; |
| break; |
| case TIFFTAG_GROUP3OPTIONS: |
| case TIFFTAG_GROUP4OPTIONS: |
| *va_arg(ap, uint32_t *) = sp->groupoptions; |
| break; |
| case TIFFTAG_BADFAXLINES: |
| *va_arg(ap, uint32_t *) = sp->badfaxlines; |
| break; |
| case TIFFTAG_CLEANFAXDATA: |
| *va_arg(ap, uint16_t *) = sp->cleanfaxdata; |
| break; |
| case TIFFTAG_CONSECUTIVEBADFAXLINES: |
| *va_arg(ap, uint32_t *) = sp->badfaxrun; |
| break; |
| default: |
| return (*sp->vgetparent)(tif, tag, ap); |
| } |
| return (1); |
| } |
| |
| static void Fax3PrintDir(TIFF *tif, FILE *fd, long flags) |
| { |
| Fax3BaseState *sp = Fax3State(tif); |
| |
| assert(sp != 0); |
| |
| (void)flags; |
| if (TIFFFieldSet(tif, FIELD_OPTIONS)) |
| { |
| const char *sep = " "; |
| if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4) |
| { |
| fprintf(fd, " Group 4 Options:"); |
| if (sp->groupoptions & GROUP4OPT_UNCOMPRESSED) |
| fprintf(fd, "%suncompressed data", sep); |
| } |
| else |
| { |
| |
| fprintf(fd, " Group 3 Options:"); |
| if (sp->groupoptions & GROUP3OPT_2DENCODING) |
| { |
| fprintf(fd, "%s2-d encoding", sep); |
| sep = "+"; |
| } |
| if (sp->groupoptions & GROUP3OPT_FILLBITS) |
| { |
| fprintf(fd, "%sEOL padding", sep); |
| sep = "+"; |
| } |
| if (sp->groupoptions & GROUP3OPT_UNCOMPRESSED) |
| fprintf(fd, "%suncompressed data", sep); |
| } |
| fprintf(fd, " (%" PRIu32 " = 0x%" PRIx32 ")\n", sp->groupoptions, |
| sp->groupoptions); |
| } |
| if (TIFFFieldSet(tif, FIELD_CLEANFAXDATA)) |
| { |
| fprintf(fd, " Fax Data:"); |
| switch (sp->cleanfaxdata) |
| { |
| case CLEANFAXDATA_CLEAN: |
| fprintf(fd, " clean"); |
| break; |
| case CLEANFAXDATA_REGENERATED: |
| fprintf(fd, " receiver regenerated"); |
| break; |
| case CLEANFAXDATA_UNCLEAN: |
| fprintf(fd, " uncorrected errors"); |
| break; |
| } |
| fprintf(fd, " (%" PRIu16 " = 0x%" PRIx16 ")\n", sp->cleanfaxdata, |
| sp->cleanfaxdata); |
| } |
| if (TIFFFieldSet(tif, FIELD_BADFAXLINES)) |
| fprintf(fd, " Bad Fax Lines: %" PRIu32 "\n", sp->badfaxlines); |
| if (TIFFFieldSet(tif, FIELD_BADFAXRUN)) |
| fprintf(fd, " Consecutive Bad Fax Lines: %" PRIu32 "\n", |
| sp->badfaxrun); |
| if (sp->printdir) |
| (*sp->printdir)(tif, fd, flags); |
| } |
| |
| static int InitCCITTFax3(TIFF *tif) |
| { |
| static const char module[] = "InitCCITTFax3"; |
| Fax3BaseState *sp; |
| |
| /* |
| * Merge codec-specific tag information. |
| */ |
| if (!_TIFFMergeFields(tif, faxFields, TIFFArrayCount(faxFields))) |
| { |
| TIFFErrorExtR(tif, "InitCCITTFax3", |
| "Merging common CCITT Fax codec-specific tags failed"); |
| return 0; |
| } |
| |
| /* |
| * Allocate state block so tag methods have storage to record values. |
| */ |
| tif->tif_data = (uint8_t *)_TIFFmallocExt(tif, sizeof(Fax3CodecState)); |
| |
| if (tif->tif_data == NULL) |
| { |
| TIFFErrorExtR(tif, module, "No space for state block"); |
| return (0); |
| } |
| _TIFFmemset(tif->tif_data, 0, sizeof(Fax3CodecState)); |
| |
| sp = Fax3State(tif); |
| sp->rw_mode = tif->tif_mode; |
| |
| /* |
| * Override parent get/set field methods. |
| */ |
| sp->vgetparent = tif->tif_tagmethods.vgetfield; |
| tif->tif_tagmethods.vgetfield = Fax3VGetField; /* hook for codec tags */ |
| sp->vsetparent = tif->tif_tagmethods.vsetfield; |
| tif->tif_tagmethods.vsetfield = Fax3VSetField; /* hook for codec tags */ |
| sp->printdir = tif->tif_tagmethods.printdir; |
| tif->tif_tagmethods.printdir = Fax3PrintDir; /* hook for codec tags */ |
| sp->groupoptions = 0; |
| |
| if (sp->rw_mode == O_RDONLY) /* FIXME: improve for in place update */ |
| tif->tif_flags |= TIFF_NOBITREV; /* decoder does bit reversal */ |
| DecoderState(tif)->runs = NULL; |
| TIFFSetField(tif, TIFFTAG_FAXFILLFUNC, _TIFFFax3fillruns); |
| EncoderState(tif)->refline = NULL; |
| |
| /* |
| * Install codec methods. |
| */ |
| tif->tif_fixuptags = Fax3FixupTags; |
| tif->tif_setupdecode = Fax3SetupState; |
| tif->tif_predecode = Fax3PreDecode; |
| tif->tif_decoderow = Fax3Decode1D; |
| tif->tif_decodestrip = Fax3Decode1D; |
| tif->tif_decodetile = Fax3Decode1D; |
| tif->tif_setupencode = Fax3SetupState; |
| tif->tif_preencode = Fax3PreEncode; |
| tif->tif_postencode = Fax3PostEncode; |
| tif->tif_encoderow = Fax3Encode; |
| tif->tif_encodestrip = Fax3Encode; |
| tif->tif_encodetile = Fax3Encode; |
| tif->tif_close = Fax3Close; |
| tif->tif_cleanup = Fax3Cleanup; |
| |
| return (1); |
| } |
| |
| int TIFFInitCCITTFax3(TIFF *tif, int scheme) |
| { |
| (void)scheme; |
| if (InitCCITTFax3(tif)) |
| { |
| /* |
| * Merge codec-specific tag information. |
| */ |
| if (!_TIFFMergeFields(tif, fax3Fields, TIFFArrayCount(fax3Fields))) |
| { |
| TIFFErrorExtR(tif, "TIFFInitCCITTFax3", |
| "Merging CCITT Fax 3 codec-specific tags failed"); |
| return 0; |
| } |
| |
| /* |
| * The default format is Class/F-style w/o RTC. |
| */ |
| return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_CLASSF); |
| } |
| else |
| return 01; |
| } |
| |
| /* |
| * CCITT Group 4 (T.6) Facsimile-compatible |
| * Compression Scheme Support. |
| */ |
| |
| #define SWAP(t, a, b) \ |
| { \ |
| t x; \ |
| x = (a); \ |
| (a) = (b); \ |
| (b) = x; \ |
| } |
| /* |
| * Decode the requested amount of G4-encoded data. |
| */ |
| static int Fax4Decode(TIFF *tif, uint8_t *buf, tmsize_t occ, uint16_t s) |
| { |
| DECLARE_STATE_2D(tif, sp, "Fax4Decode"); |
| (void)s; |
| if (occ % sp->b.rowbytes) |
| { |
| TIFFErrorExtR(tif, module, "Fractional scanlines cannot be read"); |
| return (-1); |
| } |
| if (sp->eofReachedCount >= EOF_REACHED_COUNT_THRESHOLD) |
| { |
| TIFFErrorExtR( |
| tif, module, |
| "End of file has already been reached %d times within that strip", |
| sp->eofReachedCount); |
| return (-1); |
| } |
| CACHE_STATE(tif, sp); |
| int start = sp->line; |
| while (occ > 0) |
| { |
| a0 = 0; |
| RunLength = 0; |
| pa = thisrun = sp->curruns; |
| pb = sp->refruns; |
| b1 = *pb++; |
| #ifdef FAX3_DEBUG |
| printf("\nBitAcc=%08" PRIX32 ", BitsAvail = %d\n", BitAcc, BitsAvail); |
| printf("-------------------- %d\n", tif->tif_row); |
| fflush(stdout); |
| #endif |
| EXPAND2D(EOFG4); |
| if (EOLcnt) |
| goto EOFG4; |
| if (((lastx + 7) >> 3) > (int)occ) /* check for buffer overrun */ |
| { |
| TIFFErrorExtR(tif, module, |
| "Buffer overrun detected : %" TIFF_SSIZE_FORMAT |
| " bytes available, %d bits needed", |
| occ, lastx); |
| return -1; |
| } |
| (*sp->fill)(buf, thisrun, pa, lastx); |
| SETVALUE(0); /* imaginary change for reference */ |
| SWAP(uint32_t *, sp->curruns, sp->refruns); |
| buf += sp->b.rowbytes; |
| occ -= sp->b.rowbytes; |
| sp->line++; |
| continue; |
| EOFG4: |
| NeedBits16(13, BADG4); |
| BADG4: |
| #ifdef FAX3_DEBUG |
| if (GetBits(13) != 0x1001) |
| fputs("Bad EOFB\n", stderr); |
| #endif |
| ClrBits(13); |
| if (((lastx + 7) >> 3) > (int)occ) /* check for buffer overrun */ |
| { |
| TIFFErrorExtR(tif, module, |
| "Buffer overrun detected : %" TIFF_SSIZE_FORMAT |
| " bytes available, %d bits needed", |
| occ, lastx); |
| return -1; |
| } |
| (*sp->fill)(buf, thisrun, pa, lastx); |
| UNCACHE_STATE(tif, sp); |
| return (sp->line != start |
| ? 1 |
| : -1); /* don't error on badly-terminated strips */ |
| } |
| UNCACHE_STATE(tif, sp); |
| return (1); |
| } |
| #undef SWAP |
| |
| /* |
| * Encode the requested amount of data. |
| */ |
| static int Fax4Encode(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s) |
| { |
| static const char module[] = "Fax4Encode"; |
| Fax3CodecState *sp = EncoderState(tif); |
| (void)s; |
| if (cc % sp->b.rowbytes) |
| { |
| TIFFErrorExtR(tif, module, "Fractional scanlines cannot be written"); |
| return (0); |
| } |
| while (cc > 0) |
| { |
| if (!Fax3Encode2DRow(tif, bp, sp->refline, sp->b.rowpixels)) |
| return (0); |
| _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes); |
| bp += sp->b.rowbytes; |
| cc -= sp->b.rowbytes; |
| } |
| return (1); |
| } |
| |
| static int Fax4PostEncode(TIFF *tif) |
| { |
| Fax3CodecState *sp = EncoderState(tif); |
| |
| /* terminate strip w/ EOFB */ |
| Fax3PutBits(tif, EOL, 12); |
| Fax3PutBits(tif, EOL, 12); |
| if (sp->bit != 8) |
| Fax3FlushBits(tif, sp); |
| return (1); |
| } |
| |
| int TIFFInitCCITTFax4(TIFF *tif, int scheme) |
| { |
| (void)scheme; |
| if (InitCCITTFax3(tif)) |
| { /* reuse G3 support */ |
| /* |
| * Merge codec-specific tag information. |
| */ |
| if (!_TIFFMergeFields(tif, fax4Fields, TIFFArrayCount(fax4Fields))) |
| { |
| TIFFErrorExtR(tif, "TIFFInitCCITTFax4", |
| "Merging CCITT Fax 4 codec-specific tags failed"); |
| return 0; |
| } |
| |
| tif->tif_decoderow = Fax4Decode; |
| tif->tif_decodestrip = Fax4Decode; |
| tif->tif_decodetile = Fax4Decode; |
| tif->tif_encoderow = Fax4Encode; |
| tif->tif_encodestrip = Fax4Encode; |
| tif->tif_encodetile = Fax4Encode; |
| tif->tif_postencode = Fax4PostEncode; |
| /* |
| * Suppress RTC at the end of each strip. |
| */ |
| return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_NORTC); |
| } |
| else |
| return (0); |
| } |
| |
| /* |
| * CCITT Group 3 1-D Modified Huffman RLE Compression Support. |
| * (Compression algorithms 2 and 32771) |
| */ |
| |
| /* |
| * Decode the requested amount of RLE-encoded data. |
| */ |
| static int Fax3DecodeRLE(TIFF *tif, uint8_t *buf, tmsize_t occ, uint16_t s) |
| { |
| DECLARE_STATE(tif, sp, "Fax3DecodeRLE"); |
| int mode = sp->b.mode; |
| (void)s; |
| if (occ % sp->b.rowbytes) |
| { |
| TIFFErrorExtR(tif, module, "Fractional scanlines cannot be read"); |
| return (-1); |
| } |
| CACHE_STATE(tif, sp); |
| thisrun = sp->curruns; |
| while (occ > 0) |
| { |
| a0 = 0; |
| RunLength = 0; |
| pa = thisrun; |
| #ifdef FAX3_DEBUG |
| printf("\nBitAcc=%08" PRIX32 ", BitsAvail = %d\n", BitAcc, BitsAvail); |
| printf("-------------------- %" PRIu32 "\n", tif->tif_row); |
| fflush(stdout); |
| #endif |
| EXPAND1D(EOFRLE); |
| (*sp->fill)(buf, thisrun, pa, lastx); |
| /* |
| * Cleanup at the end of the row. |
| */ |
| if (mode & FAXMODE_BYTEALIGN) |
| { |
| int n = BitsAvail - (BitsAvail & ~7); |
| ClrBits(n); |
| } |
| else if (mode & FAXMODE_WORDALIGN) |
| { |
| int n = BitsAvail - (BitsAvail & ~15); |
| ClrBits(n); |
| if (BitsAvail == 0 && !isAligned(cp, uint16_t)) |
| cp++; |
| } |
| buf += sp->b.rowbytes; |
| occ -= sp->b.rowbytes; |
| sp->line++; |
| continue; |
| EOFRLE: /* premature EOF */ |
| (*sp->fill)(buf, thisrun, pa, lastx); |
| UNCACHE_STATE(tif, sp); |
| return (-1); |
| } |
| UNCACHE_STATE(tif, sp); |
| return (1); |
| } |
| |
| int TIFFInitCCITTRLE(TIFF *tif, int scheme) |
| { |
| (void)scheme; |
| if (InitCCITTFax3(tif)) |
| { /* reuse G3 support */ |
| tif->tif_decoderow = Fax3DecodeRLE; |
| tif->tif_decodestrip = Fax3DecodeRLE; |
| tif->tif_decodetile = Fax3DecodeRLE; |
| /* |
| * Suppress RTC+EOLs when encoding and byte-align data. |
| */ |
| return TIFFSetField(tif, TIFFTAG_FAXMODE, |
| FAXMODE_NORTC | FAXMODE_NOEOL | FAXMODE_BYTEALIGN); |
| } |
| else |
| return (0); |
| } |
| |
| int TIFFInitCCITTRLEW(TIFF *tif, int scheme) |
| { |
| (void)scheme; |
| if (InitCCITTFax3(tif)) |
| { /* reuse G3 support */ |
| tif->tif_decoderow = Fax3DecodeRLE; |
| tif->tif_decodestrip = Fax3DecodeRLE; |
| tif->tif_decodetile = Fax3DecodeRLE; |
| /* |
| * Suppress RTC+EOLs when encoding and word-align data. |
| */ |
| return TIFFSetField(tif, TIFFTAG_FAXMODE, |
| FAXMODE_NORTC | FAXMODE_NOEOL | FAXMODE_WORDALIGN); |
| } |
| else |
| return (0); |
| } |
| #endif /* CCITT_SUPPORT */ |
