| /* | |
| * 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 */ | |
| int eolReachedCount; /* number of times decode has been called with | |
| EOL already reached */ | |
| int unexpectedReachedCount; /* number of times decode has been called with | |
| "unexpedted" 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 = (int)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; | |
| sp->eolReachedCount = 0; | |
| sp->unexpectedReachedCount = 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_dir.td_curtile : tif->tif_dir.td_curstrip), | |
| a0); | |
| } | |
| #define unexpected(table, a0) \ | |
| do \ | |
| { \ | |
| Fax3Unexpected(module, tif, (uint32_t)sp->line, (uint32_t)(a0)); \ | |
| ++sp->unexpectedReachedCount; \ | |
| } while (0) | |
| 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_dir.td_curtile : tif->tif_dir.td_curstrip), | |
| a0); | |
| } | |
| #define extension(a0) \ | |
| Fax3Extension(module, tif, (uint32_t)sp->line, (uint32_t)(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_dir.td_curtile : tif->tif_dir.td_curstrip), a0, | |
| lastx); | |
| } | |
| #define badlength(a0, lastx) \ | |
| do \ | |
| { \ | |
| Fax3BadLength(module, tif, (uint32_t)sp->line, (uint32_t)(a0), \ | |
| (uint32_t)(lastx)); \ | |
| ++sp->eolReachedCount; \ | |
| } while (0) | |
| 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_dir.td_curtile : tif->tif_dir.td_curstrip), | |
| a0); | |
| } | |
| #define prematureEOF(a0) \ | |
| do \ | |
| { \ | |
| Fax3PrematureEOF(module, tif, (uint32_t)sp->line, (uint32_t)(a0)); \ | |
| ++sp->eofReachedCount; \ | |
| } while (0) | |
| static void Fax3TryG3WithoutEOL(const char *module, TIFF *tif, uint32_t line, | |
| uint32_t a0) | |
| { | |
| TIFFWarningExtR( | |
| tif, module, | |
| "Try to decode (read) fax Group 3 data without EOL at line %" PRIu32 | |
| " of %s %" PRIu32 " (x %" PRIu32 "). Please check result", | |
| line, isTiled(tif) ? "tile" : "strip", | |
| (isTiled(tif) ? tif->tif_dir.td_curtile : tif->tif_dir.td_curstrip), | |
| a0); | |
| } | |
| #define tryG3WithoutEOL(a0) \ | |
| do \ | |
| { \ | |
| Fax3TryG3WithoutEOL(module, tif, (uint32_t)sp->line, (uint32_t)(a0)); \ | |
| } while (0) | |
| static int CheckReachedCounters(TIFF *tif, const char *module, | |
| Fax3CodecState *sp) | |
| { | |
| if (sp->eofReachedCount >= EOF_REACHED_COUNT_THRESHOLD) | |
| { | |
| TIFFErrorExtR(tif, module, | |
| "End of file (EOF) has already been reached %d times " | |
| "within that %s.", | |
| sp->eofReachedCount, isTiled(tif) ? "tile" : "strip"); | |
| return (-1); | |
| } | |
| if (sp->eolReachedCount >= EOF_REACHED_COUNT_THRESHOLD) | |
| { | |
| TIFFErrorExtR(tif, module, | |
| "Bad line length (EOL) has already been reached %d times " | |
| "within that %s", | |
| sp->eolReachedCount, isTiled(tif) ? "tile" : "strip"); | |
| return (-1); | |
| } | |
| if (sp->unexpectedReachedCount >= EOF_REACHED_COUNT_THRESHOLD) | |
| { | |
| TIFFErrorExtR(tif, module, | |
| "Bad code word (unexpected) has already been reached %d " | |
| "times within that %s", | |
| sp->unexpectedReachedCount, | |
| isTiled(tif) ? "tile" : "strip"); | |
| return (-1); | |
| } | |
| return (0); | |
| } | |
| /** | |
| * 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 (CheckReachedCounters(tif, module, sp)) | |
| return (-1); | |
| RETRY_WITHOUT_EOL_1D: | |
| 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_dir.td_row); | |
| fflush(stdout); | |
| #endif | |
| SYNC_EOL(EOF1D, RETRY_WITHOUT_EOL_1D); | |
| EXPAND1D(EOF1Da); | |
| (*sp->fill)(buf, thisrun, pa, (uint32_t)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, (uint32_t)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 (CheckReachedCounters(tif, module, sp)) | |
| return (-1); | |
| RETRY_WITHOUT_EOL_2D: | |
| 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, RETRY_WITHOUT_EOL_2D); | |
| 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_dir.td_row); | |
| fflush(stdout); | |
| #endif | |
| pb = sp->refruns; | |
| b1 = (int)*pb++; | |
| if (is1D) | |
| EXPAND1D(EOF2Da); | |
| else | |
| EXPAND2D(EOF2Da); | |
| (*sp->fill)(buf, thisrun, pa, (uint32_t)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, (uint32_t)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++ &= (unsigned char)(0xff << (8 - bx)); | |
| run -= 8 - bx; | |
| } | |
| if ((n = (int32_t)(run >> 3)) != 0) | |
| { /* multiple bytes to fill */ | |
| if (((size_t)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)((size_t)n / sizeof(int64_t)); | |
| n -= (int32_t)((size_t)nw * sizeof(int64_t)); | |
| do | |
| { | |
| *lp++ = 0L; | |
| } while (--nw); | |
| cp = (unsigned char *)lp; | |
| } | |
| ZERO(n, cp); | |
| run &= 7; | |
| } | |
| if (run) | |
| cp[0] &= (unsigned char)(0xff >> run); | |
| } | |
| else | |
| cp[0] &= (unsigned char)~(_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++ |= (unsigned char)(0xff >> bx); | |
| run -= 8 - bx; | |
| } | |
| if ((n = (int32_t)(run >> 3)) != 0) | |
| { /* multiple bytes to fill */ | |
| if (((size_t)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)((size_t)n / sizeof(int64_t)); | |
| n -= (int32_t)((size_t)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] |= (unsigned char)(_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); | |
| } | |
| if (td->td_samplesperpixel != 1 && | |
| td->td_planarconfig != PLANARCONFIG_SEPARATE) | |
| { | |
| TIFFErrorExtR( | |
| tif, module, | |
| "Samples/pixel shall be 1 for Group 3/4 encoding/decoding, " | |
| "or PlanarConfiguration must be set to Separate."); | |
| 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 |= (int)((unsigned int)bits >> (length - bit)); \ | |
| length -= bit; \ | |
| _FlushBits(tif); \ | |
| } \ | |
| assert(length < 9); \ | |
| data |= (int)(((unsigned int)bits & (unsigned int)_msbmask[length]) \ | |
| << (unsigned int)(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 = (unsigned int)sp->bit; | |
| int data = (int)sp->data; | |
| _PutBits(tif, bits, length); | |
| sp->data = (uint32_t)data; | |
| sp->bit = (int)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 = (unsigned int)sp->bit; | |
| int data = (int)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 = (uint32_t)data; | |
| sp->bit = (int)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 = (unsigned int)sp->bit; | |
| int data = (int)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 = (unsigned int)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 = (uint32_t)data; | |
| sp->bit = (int)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)(size_t)(8 * sizeof(int64_t))) && (0 == *lp)) | |
| { | |
| span += (int32_t)(size_t)(8 * sizeof(int64_t)); | |
| bits -= (int32_t)(size_t)(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)(size_t)(8 * sizeof(int64_t))) && | |
| (~((uint64_t)0) == (uint64_t)*lp)) | |
| { | |
| span += (int32_t)(size_t)(8 * sizeof(int64_t)); | |
| bits -= (int32_t)(size_t)(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, (int32_t)bs, (int32_t)bits); /* white span */ | |
| if (!putspan(tif, span, TIFFFaxWhiteCodes)) | |
| return 0; | |
| bs += (uint32_t)span; | |
| if (bs >= bits) | |
| break; | |
| span = find1span(bp, (int32_t)bs, (int32_t)bits); /* black span */ | |
| if (!putspan(tif, span, TIFFFaxBlackCodes)) | |
| return 0; | |
| bs += (uint32_t)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 | |
| : (uint32_t)finddiff(bp, (int32_t)0, (int32_t)bits, 0)); | |
| uint32_t b1 = (PIXEL(rp, 0) != 0 | |
| ? 0 | |
| : (uint32_t)finddiff(rp, (int32_t)0, (int32_t)bits, 0)); | |
| uint32_t a2, b2; | |
| for (;;) | |
| { | |
| b2 = (uint32_t)finddiff2(rp, (int32_t)b1, (int32_t)bits, | |
| (int32_t)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 = (uint32_t)finddiff2(bp, (int32_t)a1, (int32_t)bits, | |
| (int32_t)PIXEL(bp, a1)); | |
| if (!putcode(tif, &horizcode)) | |
| return 0; | |
| if (a0 + a1 == 0 || PIXEL(bp, a0) == 0) | |
| { | |
| if (!putspan(tif, (int32_t)(a1 - a0), TIFFFaxWhiteCodes)) | |
| return 0; | |
| if (!putspan(tif, (int32_t)(a2 - a1), TIFFFaxBlackCodes)) | |
| return 0; | |
| } | |
| else | |
| { | |
| if (!putspan(tif, (int32_t)(a1 - a0), TIFFFaxBlackCodes)) | |
| return 0; | |
| if (!putspan(tif, (int32_t)(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 = (uint32_t)finddiff(bp, (int32_t)a0, (int32_t)bits, | |
| (int32_t)PIXEL(bp, a0)); | |
| b1 = (uint32_t)finddiff(rp, (int32_t)a0, (int32_t)bits, | |
| (int32_t)!PIXEL(bp, a0)); | |
| b1 = (uint32_t)finddiff(rp, (int32_t)b1, (int32_t)bits, | |
| (int32_t)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, FIELD_PSEUDO, FALSE, | |
| FALSE, "FaxMode", NULL}, | |
| {TIFFTAG_FAXFILLFUNC, 0, 0, TIFF_ANY, 0, TIFF_SETGET_OTHER, FIELD_PSEUDO, | |
| FALSE, FALSE, "FaxFillFunc", NULL}, | |
| {TIFFTAG_BADFAXLINES, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32, | |
| FIELD_BADFAXLINES, TRUE, FALSE, "BadFaxLines", NULL}, | |
| {TIFFTAG_CLEANFAXDATA, 1, 1, TIFF_SHORT, 0, TIFF_SETGET_UINT16, | |
| FIELD_CLEANFAXDATA, TRUE, FALSE, "CleanFaxData", NULL}, | |
| {TIFFTAG_CONSECUTIVEBADFAXLINES, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32, | |
| FIELD_BADFAXRUN, TRUE, FALSE, "ConsecutiveBadFaxLines", NULL}}; | |
| static const TIFFField fax3Fields[] = { | |
| {TIFFTAG_GROUP3OPTIONS, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32, | |
| FIELD_OPTIONS, FALSE, FALSE, "Group3Options", NULL}, | |
| }; | |
| static const TIFFField fax4Fields[] = { | |
| {TIFFTAG_GROUP4OPTIONS, 1, 1, TIFF_LONG, 0, 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; | |
| default: | |
| 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 uint64_t Fax3GetMaxCompressionRatio(TIFF *tif) | |
| { | |
| (void)tif; | |
| /* See README_for_libtiff_developpers.md for raw data used to estimate | |
| * the maximum compression rate. */ | |
| /* 1024x1024: 36 */ | |
| /* 4096x4096: 100 */ | |
| /* 16383x16383: 163 */ | |
| /* 65536x65536: 200 */ | |
| /* 200000x200000: 208 */ | |
| return 250; | |
| } | |
| 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; | |
| tif->tif_getmaxcompressionratio = Fax3GetMaxCompressionRatio; | |
| 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 (CheckReachedCounters(tif, module, sp)) | |
| 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 = (int)*pb++; | |
| #ifdef FAX3_DEBUG | |
| printf("\nBitAcc=%08" PRIX32 ", BitsAvail = %d\n", BitAcc, BitsAvail); | |
| printf("-------------------- %d\n", tif->tif_dir.td_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, (uint32_t)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, (uint32_t)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); | |
| } | |
| static uint64_t Fax4GetMaxCompressionRatio(TIFF *tif) | |
| { | |
| /* FAX4 can compress up to almost one byte per line, so the compression | |
| * ratio can be up to the tile/strip width. | |
| * See README_for_libtiff_developpers.md for raw data | |
| */ | |
| return isTiled(tif) ? tif->tif_dir.td_tilewidth | |
| : tif->tif_dir.td_imagewidth; | |
| } | |
| 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; | |
| tif->tif_getmaxcompressionratio = Fax4GetMaxCompressionRatio; | |
| /* | |
| * 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); | |
| } | |
| if (CheckReachedCounters(tif, module, sp)) | |
| 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_dir.td_row); | |
| fflush(stdout); | |
| #endif | |
| EXPAND1D(EOFRLE); | |
| (*sp->fill)(buf, thisrun, pa, (uint32_t)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, (uint32_t)lastx); | |
| UNCACHE_STATE(tif, sp); | |
| return (-1); | |
| } | |
| UNCACHE_STATE(tif, sp); | |
| return (1); | |
| } | |
| static uint64_t Fax3RLEGetMaxCompressionRatio(TIFF *tif) | |
| { | |
| (void)tif; | |
| /* See README_for_libtiff_developpers.md for raw data used to estimate | |
| * the maximum compression rate. */ | |
| /* 1024x1024: 43 */ | |
| /* 4096x4096: 128 */ | |
| /* 16383x16383: 171 */ | |
| /* 65536x65536: 205 */ | |
| /* 200000x200000: 211 */ | |
| return 250; | |
| } | |
| 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; | |
| tif->tif_getmaxcompressionratio = Fax3RLEGetMaxCompressionRatio; | |
| /* | |
| * 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; | |
| tif->tif_getmaxcompressionratio = Fax3RLEGetMaxCompressionRatio; | |
| /* | |
| * 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 */ |