| /* |
| * Copyright (c) 1988-1997 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. |
| */ |
| |
| /* |
| * TIFF Library. |
| * |
| * Predictor Tag Support (used by multiple codecs). |
| */ |
| #include "tif_predict.h" |
| #include "tiffiop.h" |
| |
| #define PredictorState(tif) ((TIFFPredictorState *)(tif)->tif_data) |
| |
| static int horAcc8(TIFF *tif, uint8_t *cp0, tmsize_t cc); |
| static int horAcc16(TIFF *tif, uint8_t *cp0, tmsize_t cc); |
| static int horAcc32(TIFF *tif, uint8_t *cp0, tmsize_t cc); |
| static int horAcc64(TIFF *tif, uint8_t *cp0, tmsize_t cc); |
| static int swabHorAcc16(TIFF *tif, uint8_t *cp0, tmsize_t cc); |
| static int swabHorAcc32(TIFF *tif, uint8_t *cp0, tmsize_t cc); |
| static int swabHorAcc64(TIFF *tif, uint8_t *cp0, tmsize_t cc); |
| static int horDiff8(TIFF *tif, uint8_t *cp0, tmsize_t cc); |
| static int horDiff16(TIFF *tif, uint8_t *cp0, tmsize_t cc); |
| static int horDiff32(TIFF *tif, uint8_t *cp0, tmsize_t cc); |
| static int horDiff64(TIFF *tif, uint8_t *cp0, tmsize_t cc); |
| static int swabHorDiff16(TIFF *tif, uint8_t *cp0, tmsize_t cc); |
| static int swabHorDiff32(TIFF *tif, uint8_t *cp0, tmsize_t cc); |
| static int swabHorDiff64(TIFF *tif, uint8_t *cp0, tmsize_t cc); |
| static int fpAcc(TIFF *tif, uint8_t *cp0, tmsize_t cc); |
| static int fpDiff(TIFF *tif, uint8_t *cp0, tmsize_t cc); |
| static int PredictorDecodeRow(TIFF *tif, uint8_t *op0, tmsize_t occ0, |
| uint16_t s); |
| static int PredictorDecodeTile(TIFF *tif, uint8_t *op0, tmsize_t occ0, |
| uint16_t s); |
| static int PredictorEncodeRow(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s); |
| static int PredictorEncodeTile(TIFF *tif, uint8_t *bp0, tmsize_t cc0, |
| uint16_t s); |
| |
| static int PredictorSetup(TIFF *tif) |
| { |
| static const char module[] = "PredictorSetup"; |
| |
| TIFFPredictorState *sp = PredictorState(tif); |
| TIFFDirectory *td = &tif->tif_dir; |
| |
| switch (sp->predictor) /* no differencing */ |
| { |
| case PREDICTOR_NONE: |
| return 1; |
| case PREDICTOR_HORIZONTAL: |
| if (td->td_bitspersample != 8 && td->td_bitspersample != 16 && |
| td->td_bitspersample != 32 && td->td_bitspersample != 64) |
| { |
| TIFFErrorExtR(tif, module, |
| "Horizontal differencing \"Predictor\" not " |
| "supported with %" PRIu16 "-bit samples", |
| td->td_bitspersample); |
| return 0; |
| } |
| break; |
| case PREDICTOR_FLOATINGPOINT: |
| if (td->td_sampleformat != SAMPLEFORMAT_IEEEFP) |
| { |
| TIFFErrorExtR( |
| tif, module, |
| "Floating point \"Predictor\" not supported with %" PRIu16 |
| " data format", |
| td->td_sampleformat); |
| return 0; |
| } |
| if (td->td_bitspersample != 16 && td->td_bitspersample != 24 && |
| td->td_bitspersample != 32 && td->td_bitspersample != 64) |
| { /* Should 64 be allowed? */ |
| TIFFErrorExtR( |
| tif, module, |
| "Floating point \"Predictor\" not supported with %" PRIu16 |
| "-bit samples", |
| td->td_bitspersample); |
| return 0; |
| } |
| break; |
| default: |
| TIFFErrorExtR(tif, module, "\"Predictor\" value %d not supported", |
| sp->predictor); |
| return 0; |
| } |
| sp->stride = |
| (td->td_planarconfig == PLANARCONFIG_CONTIG ? td->td_samplesperpixel |
| : 1); |
| /* |
| * Calculate the scanline/tile-width size in bytes. |
| */ |
| if (isTiled(tif)) |
| sp->rowsize = TIFFTileRowSize(tif); |
| else |
| sp->rowsize = TIFFScanlineSize(tif); |
| if (sp->rowsize == 0) |
| return 0; |
| |
| return 1; |
| } |
| |
| static int PredictorSetupDecode(TIFF *tif) |
| { |
| TIFFPredictorState *sp = PredictorState(tif); |
| TIFFDirectory *td = &tif->tif_dir; |
| |
| /* Note: when PredictorSetup() fails, the effets of setupdecode() */ |
| /* will not be "canceled" so setupdecode() might be robust to */ |
| /* be called several times. */ |
| if (!(*sp->setupdecode)(tif) || !PredictorSetup(tif)) |
| return 0; |
| |
| if (sp->predictor == 2) |
| { |
| switch (td->td_bitspersample) |
| { |
| case 8: |
| sp->decodepfunc = horAcc8; |
| break; |
| case 16: |
| sp->decodepfunc = horAcc16; |
| break; |
| case 32: |
| sp->decodepfunc = horAcc32; |
| break; |
| case 64: |
| sp->decodepfunc = horAcc64; |
| break; |
| } |
| /* |
| * Override default decoding method with one that does the |
| * predictor stuff. |
| */ |
| if (tif->tif_decoderow != PredictorDecodeRow) |
| { |
| sp->decoderow = tif->tif_decoderow; |
| tif->tif_decoderow = PredictorDecodeRow; |
| sp->decodestrip = tif->tif_decodestrip; |
| tif->tif_decodestrip = PredictorDecodeTile; |
| sp->decodetile = tif->tif_decodetile; |
| tif->tif_decodetile = PredictorDecodeTile; |
| } |
| |
| /* |
| * If the data is horizontally differenced 16-bit data that |
| * requires byte-swapping, then it must be byte swapped before |
| * the accumulation step. We do this with a special-purpose |
| * routine and override the normal post decoding logic that |
| * the library setup when the directory was read. |
| */ |
| if (tif->tif_flags & TIFF_SWAB) |
| { |
| if (sp->decodepfunc == horAcc16) |
| { |
| sp->decodepfunc = swabHorAcc16; |
| tif->tif_postdecode = _TIFFNoPostDecode; |
| } |
| else if (sp->decodepfunc == horAcc32) |
| { |
| sp->decodepfunc = swabHorAcc32; |
| tif->tif_postdecode = _TIFFNoPostDecode; |
| } |
| else if (sp->decodepfunc == horAcc64) |
| { |
| sp->decodepfunc = swabHorAcc64; |
| tif->tif_postdecode = _TIFFNoPostDecode; |
| } |
| } |
| } |
| |
| else if (sp->predictor == 3) |
| { |
| sp->decodepfunc = fpAcc; |
| /* |
| * Override default decoding method with one that does the |
| * predictor stuff. |
| */ |
| if (tif->tif_decoderow != PredictorDecodeRow) |
| { |
| sp->decoderow = tif->tif_decoderow; |
| tif->tif_decoderow = PredictorDecodeRow; |
| sp->decodestrip = tif->tif_decodestrip; |
| tif->tif_decodestrip = PredictorDecodeTile; |
| sp->decodetile = tif->tif_decodetile; |
| tif->tif_decodetile = PredictorDecodeTile; |
| } |
| /* |
| * The data should not be swapped outside of the floating |
| * point predictor, the accumulation routine should return |
| * byres in the native order. |
| */ |
| if (tif->tif_flags & TIFF_SWAB) |
| { |
| tif->tif_postdecode = _TIFFNoPostDecode; |
| } |
| /* |
| * Allocate buffer to keep the decoded bytes before |
| * rearranging in the right order |
| */ |
| } |
| |
| return 1; |
| } |
| |
| static int PredictorSetupEncode(TIFF *tif) |
| { |
| TIFFPredictorState *sp = PredictorState(tif); |
| TIFFDirectory *td = &tif->tif_dir; |
| |
| if (!(*sp->setupencode)(tif) || !PredictorSetup(tif)) |
| return 0; |
| |
| if (sp->predictor == 2) |
| { |
| switch (td->td_bitspersample) |
| { |
| case 8: |
| sp->encodepfunc = horDiff8; |
| break; |
| case 16: |
| sp->encodepfunc = horDiff16; |
| break; |
| case 32: |
| sp->encodepfunc = horDiff32; |
| break; |
| case 64: |
| sp->encodepfunc = horDiff64; |
| break; |
| } |
| /* |
| * Override default encoding method with one that does the |
| * predictor stuff. |
| */ |
| if (tif->tif_encoderow != PredictorEncodeRow) |
| { |
| sp->encoderow = tif->tif_encoderow; |
| tif->tif_encoderow = PredictorEncodeRow; |
| sp->encodestrip = tif->tif_encodestrip; |
| tif->tif_encodestrip = PredictorEncodeTile; |
| sp->encodetile = tif->tif_encodetile; |
| tif->tif_encodetile = PredictorEncodeTile; |
| } |
| |
| /* |
| * If the data is horizontally differenced 16-bit data that |
| * requires byte-swapping, then it must be byte swapped after |
| * the differentiation step. We do this with a special-purpose |
| * routine and override the normal post decoding logic that |
| * the library setup when the directory was read. |
| */ |
| if (tif->tif_flags & TIFF_SWAB) |
| { |
| if (sp->encodepfunc == horDiff16) |
| { |
| sp->encodepfunc = swabHorDiff16; |
| tif->tif_postdecode = _TIFFNoPostDecode; |
| } |
| else if (sp->encodepfunc == horDiff32) |
| { |
| sp->encodepfunc = swabHorDiff32; |
| tif->tif_postdecode = _TIFFNoPostDecode; |
| } |
| else if (sp->encodepfunc == horDiff64) |
| { |
| sp->encodepfunc = swabHorDiff64; |
| tif->tif_postdecode = _TIFFNoPostDecode; |
| } |
| } |
| } |
| |
| else if (sp->predictor == 3) |
| { |
| sp->encodepfunc = fpDiff; |
| /* |
| * Override default encoding method with one that does the |
| * predictor stuff. |
| */ |
| if (tif->tif_encoderow != PredictorEncodeRow) |
| { |
| sp->encoderow = tif->tif_encoderow; |
| tif->tif_encoderow = PredictorEncodeRow; |
| sp->encodestrip = tif->tif_encodestrip; |
| tif->tif_encodestrip = PredictorEncodeTile; |
| sp->encodetile = tif->tif_encodetile; |
| tif->tif_encodetile = PredictorEncodeTile; |
| } |
| } |
| |
| return 1; |
| } |
| |
| #define REPEAT4(n, op) \ |
| switch (n) \ |
| { \ |
| default: \ |
| { \ |
| tmsize_t i; \ |
| for (i = n - 4; i > 0; i--) \ |
| { \ |
| op; \ |
| } \ |
| } /*-fallthrough*/ \ |
| case 4: \ |
| op; /*-fallthrough*/ \ |
| case 3: \ |
| op; /*-fallthrough*/ \ |
| case 2: \ |
| op; /*-fallthrough*/ \ |
| case 1: \ |
| op; /*-fallthrough*/ \ |
| case 0:; \ |
| } |
| |
| /* Remarks related to C standard compliance in all below functions : */ |
| /* - to avoid any undefined behavior, we only operate on unsigned types */ |
| /* since the behavior of "overflows" is defined (wrap over) */ |
| /* - when storing into the byte stream, we explicitly mask with 0xff so */ |
| /* as to make icc -check=conversions happy (not necessary by the standard) */ |
| |
| TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW |
| static int horAcc8(TIFF *tif, uint8_t *cp0, tmsize_t cc) |
| { |
| tmsize_t stride = PredictorState(tif)->stride; |
| |
| unsigned char *cp = (unsigned char *)cp0; |
| if ((cc % stride) != 0) |
| { |
| TIFFErrorExtR(tif, "horAcc8", "%s", "(cc%stride)!=0"); |
| return 0; |
| } |
| |
| if (cc > stride) |
| { |
| /* |
| * Pipeline the most common cases. |
| */ |
| if (stride == 3) |
| { |
| unsigned int cr = cp[0]; |
| unsigned int cg = cp[1]; |
| unsigned int cb = cp[2]; |
| tmsize_t i = stride; |
| for (; i < cc; i += stride) |
| { |
| cp[i + 0] = (unsigned char)((cr += cp[i + 0]) & 0xff); |
| cp[i + 1] = (unsigned char)((cg += cp[i + 1]) & 0xff); |
| cp[i + 2] = (unsigned char)((cb += cp[i + 2]) & 0xff); |
| } |
| } |
| else if (stride == 4) |
| { |
| unsigned int cr = cp[0]; |
| unsigned int cg = cp[1]; |
| unsigned int cb = cp[2]; |
| unsigned int ca = cp[3]; |
| tmsize_t i = stride; |
| for (; i < cc; i += stride) |
| { |
| cp[i + 0] = (unsigned char)((cr += cp[i + 0]) & 0xff); |
| cp[i + 1] = (unsigned char)((cg += cp[i + 1]) & 0xff); |
| cp[i + 2] = (unsigned char)((cb += cp[i + 2]) & 0xff); |
| cp[i + 3] = (unsigned char)((ca += cp[i + 3]) & 0xff); |
| } |
| } |
| else |
| { |
| cc -= stride; |
| do |
| { |
| REPEAT4(stride, |
| cp[stride] = (unsigned char)((cp[stride] + *cp) & 0xff); |
| cp++) |
| cc -= stride; |
| } while (cc > 0); |
| } |
| } |
| return 1; |
| } |
| |
| static int swabHorAcc16(TIFF *tif, uint8_t *cp0, tmsize_t cc) |
| { |
| uint16_t *wp = (uint16_t *)cp0; |
| tmsize_t wc = cc / 2; |
| |
| TIFFSwabArrayOfShort(wp, wc); |
| return horAcc16(tif, cp0, cc); |
| } |
| |
| TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW |
| static int horAcc16(TIFF *tif, uint8_t *cp0, tmsize_t cc) |
| { |
| tmsize_t stride = PredictorState(tif)->stride; |
| uint16_t *wp = (uint16_t *)cp0; |
| tmsize_t wc = cc / 2; |
| |
| if ((cc % (2 * stride)) != 0) |
| { |
| TIFFErrorExtR(tif, "horAcc16", "%s", "cc%(2*stride))!=0"); |
| return 0; |
| } |
| |
| if (wc > stride) |
| { |
| wc -= stride; |
| do |
| { |
| REPEAT4(stride, wp[stride] = (uint16_t)(((unsigned int)wp[stride] + |
| (unsigned int)wp[0]) & |
| 0xffff); |
| wp++) |
| wc -= stride; |
| } while (wc > 0); |
| } |
| return 1; |
| } |
| |
| static int swabHorAcc32(TIFF *tif, uint8_t *cp0, tmsize_t cc) |
| { |
| uint32_t *wp = (uint32_t *)cp0; |
| tmsize_t wc = cc / 4; |
| |
| TIFFSwabArrayOfLong(wp, wc); |
| return horAcc32(tif, cp0, cc); |
| } |
| |
| TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW |
| static int horAcc32(TIFF *tif, uint8_t *cp0, tmsize_t cc) |
| { |
| tmsize_t stride = PredictorState(tif)->stride; |
| uint32_t *wp = (uint32_t *)cp0; |
| tmsize_t wc = cc / 4; |
| |
| if ((cc % (4 * stride)) != 0) |
| { |
| TIFFErrorExtR(tif, "horAcc32", "%s", "cc%(4*stride))!=0"); |
| return 0; |
| } |
| |
| if (wc > stride) |
| { |
| wc -= stride; |
| do |
| { |
| REPEAT4(stride, wp[stride] += wp[0]; wp++) |
| wc -= stride; |
| } while (wc > 0); |
| } |
| return 1; |
| } |
| |
| static int swabHorAcc64(TIFF *tif, uint8_t *cp0, tmsize_t cc) |
| { |
| uint64_t *wp = (uint64_t *)cp0; |
| tmsize_t wc = cc / 8; |
| |
| TIFFSwabArrayOfLong8(wp, wc); |
| return horAcc64(tif, cp0, cc); |
| } |
| |
| TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW |
| static int horAcc64(TIFF *tif, uint8_t *cp0, tmsize_t cc) |
| { |
| tmsize_t stride = PredictorState(tif)->stride; |
| uint64_t *wp = (uint64_t *)cp0; |
| tmsize_t wc = cc / 8; |
| |
| if ((cc % (8 * stride)) != 0) |
| { |
| TIFFErrorExtR(tif, "horAcc64", "%s", "cc%(8*stride))!=0"); |
| return 0; |
| } |
| |
| if (wc > stride) |
| { |
| wc -= stride; |
| do |
| { |
| REPEAT4(stride, wp[stride] += wp[0]; wp++) |
| wc -= stride; |
| } while (wc > 0); |
| } |
| return 1; |
| } |
| |
| /* |
| * Floating point predictor accumulation routine. |
| */ |
| static int fpAcc(TIFF *tif, uint8_t *cp0, tmsize_t cc) |
| { |
| tmsize_t stride = PredictorState(tif)->stride; |
| uint32_t bps = tif->tif_dir.td_bitspersample / 8; |
| tmsize_t wc = cc / bps; |
| tmsize_t count = cc; |
| uint8_t *cp = (uint8_t *)cp0; |
| uint8_t *tmp; |
| |
| if (cc % (bps * stride) != 0) |
| { |
| TIFFErrorExtR(tif, "fpAcc", "%s", "cc%(bps*stride))!=0"); |
| return 0; |
| } |
| |
| tmp = (uint8_t *)_TIFFmallocExt(tif, cc); |
| if (!tmp) |
| return 0; |
| |
| while (count > stride) |
| { |
| REPEAT4(stride, |
| cp[stride] = (unsigned char)((cp[stride] + cp[0]) & 0xff); |
| cp++) |
| count -= stride; |
| } |
| |
| _TIFFmemcpy(tmp, cp0, cc); |
| cp = (uint8_t *)cp0; |
| for (count = 0; count < wc; count++) |
| { |
| uint32_t byte; |
| for (byte = 0; byte < bps; byte++) |
| { |
| #if WORDS_BIGENDIAN |
| cp[bps * count + byte] = tmp[byte * wc + count]; |
| #else |
| cp[bps * count + byte] = tmp[(bps - byte - 1) * wc + count]; |
| #endif |
| } |
| } |
| _TIFFfreeExt(tif, tmp); |
| return 1; |
| } |
| |
| /* |
| * Decode a scanline and apply the predictor routine. |
| */ |
| static int PredictorDecodeRow(TIFF *tif, uint8_t *op0, tmsize_t occ0, |
| uint16_t s) |
| { |
| TIFFPredictorState *sp = PredictorState(tif); |
| |
| assert(sp != NULL); |
| assert(sp->decoderow != NULL); |
| assert(sp->decodepfunc != NULL); |
| |
| if ((*sp->decoderow)(tif, op0, occ0, s)) |
| { |
| return (*sp->decodepfunc)(tif, op0, occ0); |
| } |
| else |
| return 0; |
| } |
| |
| /* |
| * Decode a tile/strip and apply the predictor routine. |
| * Note that horizontal differencing must be done on a |
| * row-by-row basis. The width of a "row" has already |
| * been calculated at pre-decode time according to the |
| * strip/tile dimensions. |
| */ |
| static int PredictorDecodeTile(TIFF *tif, uint8_t *op0, tmsize_t occ0, |
| uint16_t s) |
| { |
| TIFFPredictorState *sp = PredictorState(tif); |
| |
| assert(sp != NULL); |
| assert(sp->decodetile != NULL); |
| |
| if ((*sp->decodetile)(tif, op0, occ0, s)) |
| { |
| tmsize_t rowsize = sp->rowsize; |
| assert(rowsize > 0); |
| if ((occ0 % rowsize) != 0) |
| { |
| TIFFErrorExtR(tif, "PredictorDecodeTile", "%s", |
| "occ0%rowsize != 0"); |
| return 0; |
| } |
| assert(sp->decodepfunc != NULL); |
| while (occ0 > 0) |
| { |
| if (!(*sp->decodepfunc)(tif, op0, rowsize)) |
| return 0; |
| occ0 -= rowsize; |
| op0 += rowsize; |
| } |
| return 1; |
| } |
| else |
| return 0; |
| } |
| |
| TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW |
| static int horDiff8(TIFF *tif, uint8_t *cp0, tmsize_t cc) |
| { |
| TIFFPredictorState *sp = PredictorState(tif); |
| tmsize_t stride = sp->stride; |
| unsigned char *cp = (unsigned char *)cp0; |
| |
| if ((cc % stride) != 0) |
| { |
| TIFFErrorExtR(tif, "horDiff8", "%s", "(cc%stride)!=0"); |
| return 0; |
| } |
| |
| if (cc > stride) |
| { |
| cc -= stride; |
| /* |
| * Pipeline the most common cases. |
| */ |
| if (stride == 3) |
| { |
| unsigned int r1, g1, b1; |
| unsigned int r2 = cp[0]; |
| unsigned int g2 = cp[1]; |
| unsigned int b2 = cp[2]; |
| do |
| { |
| r1 = cp[3]; |
| cp[3] = (unsigned char)((r1 - r2) & 0xff); |
| r2 = r1; |
| g1 = cp[4]; |
| cp[4] = (unsigned char)((g1 - g2) & 0xff); |
| g2 = g1; |
| b1 = cp[5]; |
| cp[5] = (unsigned char)((b1 - b2) & 0xff); |
| b2 = b1; |
| cp += 3; |
| } while ((cc -= 3) > 0); |
| } |
| else if (stride == 4) |
| { |
| unsigned int r1, g1, b1, a1; |
| unsigned int r2 = cp[0]; |
| unsigned int g2 = cp[1]; |
| unsigned int b2 = cp[2]; |
| unsigned int a2 = cp[3]; |
| do |
| { |
| r1 = cp[4]; |
| cp[4] = (unsigned char)((r1 - r2) & 0xff); |
| r2 = r1; |
| g1 = cp[5]; |
| cp[5] = (unsigned char)((g1 - g2) & 0xff); |
| g2 = g1; |
| b1 = cp[6]; |
| cp[6] = (unsigned char)((b1 - b2) & 0xff); |
| b2 = b1; |
| a1 = cp[7]; |
| cp[7] = (unsigned char)((a1 - a2) & 0xff); |
| a2 = a1; |
| cp += 4; |
| } while ((cc -= 4) > 0); |
| } |
| else |
| { |
| cp += cc - 1; |
| do |
| { |
| REPEAT4(stride, |
| cp[stride] = |
| (unsigned char)((cp[stride] - cp[0]) & 0xff); |
| cp--) |
| } while ((cc -= stride) > 0); |
| } |
| } |
| return 1; |
| } |
| |
| TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW |
| static int horDiff16(TIFF *tif, uint8_t *cp0, tmsize_t cc) |
| { |
| TIFFPredictorState *sp = PredictorState(tif); |
| tmsize_t stride = sp->stride; |
| uint16_t *wp = (uint16_t *)cp0; |
| tmsize_t wc = cc / 2; |
| |
| if ((cc % (2 * stride)) != 0) |
| { |
| TIFFErrorExtR(tif, "horDiff8", "%s", "(cc%(2*stride))!=0"); |
| return 0; |
| } |
| |
| if (wc > stride) |
| { |
| wc -= stride; |
| wp += wc - 1; |
| do |
| { |
| REPEAT4(stride, wp[stride] = (uint16_t)(((unsigned int)wp[stride] - |
| (unsigned int)wp[0]) & |
| 0xffff); |
| wp--) |
| wc -= stride; |
| } while (wc > 0); |
| } |
| return 1; |
| } |
| |
| static int swabHorDiff16(TIFF *tif, uint8_t *cp0, tmsize_t cc) |
| { |
| uint16_t *wp = (uint16_t *)cp0; |
| tmsize_t wc = cc / 2; |
| |
| if (!horDiff16(tif, cp0, cc)) |
| return 0; |
| |
| TIFFSwabArrayOfShort(wp, wc); |
| return 1; |
| } |
| |
| TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW |
| static int horDiff32(TIFF *tif, uint8_t *cp0, tmsize_t cc) |
| { |
| TIFFPredictorState *sp = PredictorState(tif); |
| tmsize_t stride = sp->stride; |
| uint32_t *wp = (uint32_t *)cp0; |
| tmsize_t wc = cc / 4; |
| |
| if ((cc % (4 * stride)) != 0) |
| { |
| TIFFErrorExtR(tif, "horDiff32", "%s", "(cc%(4*stride))!=0"); |
| return 0; |
| } |
| |
| if (wc > stride) |
| { |
| wc -= stride; |
| wp += wc - 1; |
| do |
| { |
| REPEAT4(stride, wp[stride] -= wp[0]; wp--) |
| wc -= stride; |
| } while (wc > 0); |
| } |
| return 1; |
| } |
| |
| static int swabHorDiff32(TIFF *tif, uint8_t *cp0, tmsize_t cc) |
| { |
| uint32_t *wp = (uint32_t *)cp0; |
| tmsize_t wc = cc / 4; |
| |
| if (!horDiff32(tif, cp0, cc)) |
| return 0; |
| |
| TIFFSwabArrayOfLong(wp, wc); |
| return 1; |
| } |
| |
| TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW |
| static int horDiff64(TIFF *tif, uint8_t *cp0, tmsize_t cc) |
| { |
| TIFFPredictorState *sp = PredictorState(tif); |
| tmsize_t stride = sp->stride; |
| uint64_t *wp = (uint64_t *)cp0; |
| tmsize_t wc = cc / 8; |
| |
| if ((cc % (8 * stride)) != 0) |
| { |
| TIFFErrorExtR(tif, "horDiff64", "%s", "(cc%(8*stride))!=0"); |
| return 0; |
| } |
| |
| if (wc > stride) |
| { |
| wc -= stride; |
| wp += wc - 1; |
| do |
| { |
| REPEAT4(stride, wp[stride] -= wp[0]; wp--) |
| wc -= stride; |
| } while (wc > 0); |
| } |
| return 1; |
| } |
| |
| static int swabHorDiff64(TIFF *tif, uint8_t *cp0, tmsize_t cc) |
| { |
| uint64_t *wp = (uint64_t *)cp0; |
| tmsize_t wc = cc / 8; |
| |
| if (!horDiff64(tif, cp0, cc)) |
| return 0; |
| |
| TIFFSwabArrayOfLong8(wp, wc); |
| return 1; |
| } |
| |
| /* |
| * Floating point predictor differencing routine. |
| */ |
| TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW |
| static int fpDiff(TIFF *tif, uint8_t *cp0, tmsize_t cc) |
| { |
| tmsize_t stride = PredictorState(tif)->stride; |
| uint32_t bps = tif->tif_dir.td_bitspersample / 8; |
| tmsize_t wc = cc / bps; |
| tmsize_t count; |
| uint8_t *cp = (uint8_t *)cp0; |
| uint8_t *tmp; |
| |
| if ((cc % (bps * stride)) != 0) |
| { |
| TIFFErrorExtR(tif, "fpDiff", "%s", "(cc%(bps*stride))!=0"); |
| return 0; |
| } |
| |
| tmp = (uint8_t *)_TIFFmallocExt(tif, cc); |
| if (!tmp) |
| return 0; |
| |
| _TIFFmemcpy(tmp, cp0, cc); |
| for (count = 0; count < wc; count++) |
| { |
| uint32_t byte; |
| for (byte = 0; byte < bps; byte++) |
| { |
| #if WORDS_BIGENDIAN |
| cp[byte * wc + count] = tmp[bps * count + byte]; |
| #else |
| cp[(bps - byte - 1) * wc + count] = tmp[bps * count + byte]; |
| #endif |
| } |
| } |
| _TIFFfreeExt(tif, tmp); |
| |
| cp = (uint8_t *)cp0; |
| cp += cc - stride - 1; |
| for (count = cc; count > stride; count -= stride) |
| REPEAT4(stride, |
| cp[stride] = (unsigned char)((cp[stride] - cp[0]) & 0xff); |
| cp--) |
| return 1; |
| } |
| |
| static int PredictorEncodeRow(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s) |
| { |
| TIFFPredictorState *sp = PredictorState(tif); |
| |
| assert(sp != NULL); |
| assert(sp->encodepfunc != NULL); |
| assert(sp->encoderow != NULL); |
| |
| /* XXX horizontal differencing alters user's data XXX */ |
| if (!(*sp->encodepfunc)(tif, bp, cc)) |
| return 0; |
| return (*sp->encoderow)(tif, bp, cc, s); |
| } |
| |
| static int PredictorEncodeTile(TIFF *tif, uint8_t *bp0, tmsize_t cc0, |
| uint16_t s) |
| { |
| static const char module[] = "PredictorEncodeTile"; |
| TIFFPredictorState *sp = PredictorState(tif); |
| uint8_t *working_copy; |
| tmsize_t cc = cc0, rowsize; |
| unsigned char *bp; |
| int result_code; |
| |
| assert(sp != NULL); |
| assert(sp->encodepfunc != NULL); |
| assert(sp->encodetile != NULL); |
| |
| /* |
| * Do predictor manipulation in a working buffer to avoid altering |
| * the callers buffer. http://trac.osgeo.org/gdal/ticket/1965 |
| */ |
| working_copy = (uint8_t *)_TIFFmallocExt(tif, cc0); |
| if (working_copy == NULL) |
| { |
| TIFFErrorExtR(tif, module, |
| "Out of memory allocating %" PRId64 " byte temp buffer.", |
| (int64_t)cc0); |
| return 0; |
| } |
| memcpy(working_copy, bp0, cc0); |
| bp = working_copy; |
| |
| rowsize = sp->rowsize; |
| assert(rowsize > 0); |
| if ((cc0 % rowsize) != 0) |
| { |
| TIFFErrorExtR(tif, "PredictorEncodeTile", "%s", "(cc0%rowsize)!=0"); |
| _TIFFfreeExt(tif, working_copy); |
| return 0; |
| } |
| while (cc > 0) |
| { |
| (*sp->encodepfunc)(tif, bp, rowsize); |
| cc -= rowsize; |
| bp += rowsize; |
| } |
| result_code = (*sp->encodetile)(tif, working_copy, cc0, s); |
| |
| _TIFFfreeExt(tif, working_copy); |
| |
| return result_code; |
| } |
| |
| #define FIELD_PREDICTOR (FIELD_CODEC + 0) /* XXX */ |
| |
| static const TIFFField predictFields[] = { |
| {TIFFTAG_PREDICTOR, 1, 1, TIFF_SHORT, 0, TIFF_SETGET_UINT16, |
| TIFF_SETGET_UINT16, FIELD_PREDICTOR, FALSE, FALSE, "Predictor", NULL}, |
| }; |
| |
| static int PredictorVSetField(TIFF *tif, uint32_t tag, va_list ap) |
| { |
| TIFFPredictorState *sp = PredictorState(tif); |
| |
| assert(sp != NULL); |
| assert(sp->vsetparent != NULL); |
| |
| switch (tag) |
| { |
| case TIFFTAG_PREDICTOR: |
| sp->predictor = (uint16_t)va_arg(ap, uint16_vap); |
| TIFFSetFieldBit(tif, FIELD_PREDICTOR); |
| break; |
| default: |
| return (*sp->vsetparent)(tif, tag, ap); |
| } |
| tif->tif_flags |= TIFF_DIRTYDIRECT; |
| return 1; |
| } |
| |
| static int PredictorVGetField(TIFF *tif, uint32_t tag, va_list ap) |
| { |
| TIFFPredictorState *sp = PredictorState(tif); |
| |
| assert(sp != NULL); |
| assert(sp->vgetparent != NULL); |
| |
| switch (tag) |
| { |
| case TIFFTAG_PREDICTOR: |
| *va_arg(ap, uint16_t *) = (uint16_t)sp->predictor; |
| break; |
| default: |
| return (*sp->vgetparent)(tif, tag, ap); |
| } |
| return 1; |
| } |
| |
| static void PredictorPrintDir(TIFF *tif, FILE *fd, long flags) |
| { |
| TIFFPredictorState *sp = PredictorState(tif); |
| |
| (void)flags; |
| if (TIFFFieldSet(tif, FIELD_PREDICTOR)) |
| { |
| fprintf(fd, " Predictor: "); |
| switch (sp->predictor) |
| { |
| case 1: |
| fprintf(fd, "none "); |
| break; |
| case 2: |
| fprintf(fd, "horizontal differencing "); |
| break; |
| case 3: |
| fprintf(fd, "floating point predictor "); |
| break; |
| } |
| fprintf(fd, "%d (0x%x)\n", sp->predictor, sp->predictor); |
| } |
| if (sp->printdir) |
| (*sp->printdir)(tif, fd, flags); |
| } |
| |
| int TIFFPredictorInit(TIFF *tif) |
| { |
| TIFFPredictorState *sp = PredictorState(tif); |
| |
| assert(sp != 0); |
| |
| /* |
| * Merge codec-specific tag information. |
| */ |
| if (!_TIFFMergeFields(tif, predictFields, TIFFArrayCount(predictFields))) |
| { |
| TIFFErrorExtR(tif, "TIFFPredictorInit", |
| "Merging Predictor codec-specific tags failed"); |
| return 0; |
| } |
| |
| /* |
| * Override parent get/set field methods. |
| */ |
| sp->vgetparent = tif->tif_tagmethods.vgetfield; |
| tif->tif_tagmethods.vgetfield = |
| PredictorVGetField; /* hook for predictor tag */ |
| sp->vsetparent = tif->tif_tagmethods.vsetfield; |
| tif->tif_tagmethods.vsetfield = |
| PredictorVSetField; /* hook for predictor tag */ |
| sp->printdir = tif->tif_tagmethods.printdir; |
| tif->tif_tagmethods.printdir = |
| PredictorPrintDir; /* hook for predictor tag */ |
| |
| sp->setupdecode = tif->tif_setupdecode; |
| tif->tif_setupdecode = PredictorSetupDecode; |
| sp->setupencode = tif->tif_setupencode; |
| tif->tif_setupencode = PredictorSetupEncode; |
| |
| sp->predictor = 1; /* default value */ |
| sp->encodepfunc = NULL; /* no predictor routine */ |
| sp->decodepfunc = NULL; /* no predictor routine */ |
| return 1; |
| } |
| |
| int TIFFPredictorCleanup(TIFF *tif) |
| { |
| TIFFPredictorState *sp = PredictorState(tif); |
| |
| assert(sp != 0); |
| |
| tif->tif_tagmethods.vgetfield = sp->vgetparent; |
| tif->tif_tagmethods.vsetfield = sp->vsetparent; |
| tif->tif_tagmethods.printdir = sp->printdir; |
| tif->tif_setupdecode = sp->setupdecode; |
| tif->tif_setupencode = sp->setupencode; |
| |
| return 1; |
| } |
