diff options
Diffstat (limited to 'src/3rdparty/libtiff/libtiff/tif_predict.c')
-rw-r--r-- | src/3rdparty/libtiff/libtiff/tif_predict.c | 144 |
1 files changed, 87 insertions, 57 deletions
diff --git a/src/3rdparty/libtiff/libtiff/tif_predict.c b/src/3rdparty/libtiff/libtiff/tif_predict.c index f93c664..1388dde 100644 --- a/src/3rdparty/libtiff/libtiff/tif_predict.c +++ b/src/3rdparty/libtiff/libtiff/tif_predict.c @@ -1,4 +1,4 @@ -/* $Id: tif_predict.c,v 1.32 2010-03-10 18:56:49 bfriesen Exp $ */ +/* $Id: tif_predict.c,v 1.35 2015-08-31 15:05:57 erouault Exp $ */ /* * Copyright (c) 1988-1997 Sam Leffler @@ -42,6 +42,8 @@ static void swabHorAcc32(TIFF* tif, uint8* cp0, tmsize_t cc); static void horDiff8(TIFF* tif, uint8* cp0, tmsize_t cc); static void horDiff16(TIFF* tif, uint8* cp0, tmsize_t cc); static void horDiff32(TIFF* tif, uint8* cp0, tmsize_t cc); +static void swabHorDiff16(TIFF* tif, uint8* cp0, tmsize_t cc); +static void swabHorDiff32(TIFF* tif, uint8* cp0, tmsize_t cc); static void fpAcc(TIFF* tif, uint8* cp0, tmsize_t cc); static void fpDiff(TIFF* tif, uint8* cp0, tmsize_t cc); static int PredictorDecodeRow(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s); @@ -207,7 +209,24 @@ PredictorSetupEncode(TIFF* tif) 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 differenciation 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->predictor == 3) { sp->encodepfunc = fpDiff; @@ -239,12 +258,18 @@ PredictorSetupEncode(TIFF* tif) case 0: ; \ } +/* Remarks related to C standard compliance in all below functions : */ +/* - to avoid any undefined behaviour, we only operate on unsigned types */ +/* since the behaviour 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) */ + static void horAcc8(TIFF* tif, uint8* cp0, tmsize_t cc) { tmsize_t stride = PredictorState(tif)->stride; - char* cp = (char*) cp0; + unsigned char* cp = (unsigned char*) cp0; assert((cc%stride)==0); if (cc > stride) { /* @@ -257,9 +282,9 @@ horAcc8(TIFF* tif, uint8* cp0, tmsize_t cc) cc -= 3; cp += 3; while (cc>0) { - cp[0] = (char) (cr += cp[0]); - cp[1] = (char) (cg += cp[1]); - cp[2] = (char) (cb += cp[2]); + cp[0] = (unsigned char) ((cr += cp[0]) & 0xff); + cp[1] = (unsigned char) ((cg += cp[1]) & 0xff); + cp[2] = (unsigned char) ((cb += cp[2]) & 0xff); cc -= 3; cp += 3; } @@ -271,10 +296,10 @@ horAcc8(TIFF* tif, uint8* cp0, tmsize_t cc) cc -= 4; cp += 4; while (cc>0) { - cp[0] = (char) (cr += cp[0]); - cp[1] = (char) (cg += cp[1]); - cp[2] = (char) (cb += cp[2]); - cp[3] = (char) (ca += cp[3]); + cp[0] = (unsigned char) ((cr += cp[0]) & 0xff); + cp[1] = (unsigned char) ((cg += cp[1]) & 0xff); + cp[2] = (unsigned char) ((cb += cp[2]) & 0xff); + cp[3] = (unsigned char) ((ca += cp[3]) & 0xff); cc -= 4; cp += 4; } @@ -282,7 +307,7 @@ horAcc8(TIFF* tif, uint8* cp0, tmsize_t cc) cc -= stride; do { REPEAT4(stride, cp[stride] = - (char) (cp[stride] + *cp); cp++) + (unsigned char) ((cp[stride] + *cp) & 0xff); cp++) cc -= stride; } while (cc>0); } @@ -292,20 +317,11 @@ horAcc8(TIFF* tif, uint8* cp0, tmsize_t cc) static void swabHorAcc16(TIFF* tif, uint8* cp0, tmsize_t cc) { - tmsize_t stride = PredictorState(tif)->stride; uint16* wp = (uint16*) cp0; tmsize_t wc = cc / 2; - assert((cc%(2*stride))==0); - - if (wc > stride) { - TIFFSwabArrayOfShort(wp, wc); - wc -= stride; - do { - REPEAT4(stride, wp[stride] += wp[0]; wp++) - wc -= stride; - } while (wc > 0); - } + TIFFSwabArrayOfShort(wp, wc); + horAcc16(tif, cp0, cc); } static void @@ -320,7 +336,7 @@ horAcc16(TIFF* tif, uint8* cp0, tmsize_t cc) if (wc > stride) { wc -= stride; do { - REPEAT4(stride, wp[stride] += wp[0]; wp++) + REPEAT4(stride, wp[stride] = (uint16)(((unsigned int)wp[stride] + (unsigned int)wp[0]) & 0xffff); wp++) wc -= stride; } while (wc > 0); } @@ -329,20 +345,11 @@ horAcc16(TIFF* tif, uint8* cp0, tmsize_t cc) static void swabHorAcc32(TIFF* tif, uint8* cp0, tmsize_t cc) { - tmsize_t stride = PredictorState(tif)->stride; uint32* wp = (uint32*) cp0; tmsize_t wc = cc / 4; - assert((cc%(4*stride))==0); - - if (wc > stride) { - TIFFSwabArrayOfLong(wp, wc); - wc -= stride; - do { - REPEAT4(stride, wp[stride] += wp[0]; wp++) - wc -= stride; - } while (wc > 0); - } + TIFFSwabArrayOfLong(wp, wc); + horAcc32(tif, cp0, cc); } static void @@ -382,7 +389,8 @@ fpAcc(TIFF* tif, uint8* cp0, tmsize_t cc) return; while (count > stride) { - REPEAT4(stride, cp[stride] += cp[0]; cp++) + REPEAT4(stride, cp[stride] = + (unsigned char) ((cp[stride] + cp[0]) & 0xff); cp++) count -= stride; } @@ -456,7 +464,7 @@ horDiff8(TIFF* tif, uint8* cp0, tmsize_t cc) { TIFFPredictorState* sp = PredictorState(tif); tmsize_t stride = sp->stride; - char* cp = (char*) cp0; + unsigned char* cp = (unsigned char*) cp0; assert((cc%stride)==0); @@ -466,33 +474,33 @@ horDiff8(TIFF* tif, uint8* cp0, tmsize_t cc) * Pipeline the most common cases. */ if (stride == 3) { - int r1, g1, b1; - int r2 = cp[0]; - int g2 = cp[1]; - int b2 = cp[2]; + 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] = r1-r2; r2 = r1; - g1 = cp[4]; cp[4] = g1-g2; g2 = g1; - b1 = cp[5]; cp[5] = b1-b2; b2 = b1; + 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) { - int r1, g1, b1, a1; - int r2 = cp[0]; - int g2 = cp[1]; - int b2 = cp[2]; - int a2 = cp[3]; + 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] = r1-r2; r2 = r1; - g1 = cp[5]; cp[5] = g1-g2; g2 = g1; - b1 = cp[6]; cp[6] = b1-b2; b2 = b1; - a1 = cp[7]; cp[7] = a1-a2; a2 = a1; + 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] -= cp[0]; cp--) + REPEAT4(stride, cp[stride] = (unsigned char)((cp[stride] - cp[0])&0xff); cp--) } while ((cc -= stride) > 0); } } @@ -503,7 +511,7 @@ horDiff16(TIFF* tif, uint8* cp0, tmsize_t cc) { TIFFPredictorState* sp = PredictorState(tif); tmsize_t stride = sp->stride; - int16 *wp = (int16*) cp0; + uint16 *wp = (uint16*) cp0; tmsize_t wc = cc/2; assert((cc%(2*stride))==0); @@ -512,18 +520,29 @@ horDiff16(TIFF* tif, uint8* cp0, tmsize_t cc) wc -= stride; wp += wc - 1; do { - REPEAT4(stride, wp[stride] -= wp[0]; wp--) + REPEAT4(stride, wp[stride] = (uint16)(((unsigned int)wp[stride] - (unsigned int)wp[0]) & 0xffff); wp--) wc -= stride; } while (wc > 0); } } static void +swabHorDiff16(TIFF* tif, uint8* cp0, tmsize_t cc) +{ + uint16* wp = (uint16*) cp0; + tmsize_t wc = cc / 2; + + horDiff16(tif, cp0, cc); + + TIFFSwabArrayOfShort(wp, wc); +} + +static void horDiff32(TIFF* tif, uint8* cp0, tmsize_t cc) { TIFFPredictorState* sp = PredictorState(tif); tmsize_t stride = sp->stride; - int32 *wp = (int32*) cp0; + uint32 *wp = (uint32*) cp0; tmsize_t wc = cc/4; assert((cc%(4*stride))==0); @@ -538,6 +557,17 @@ horDiff32(TIFF* tif, uint8* cp0, tmsize_t cc) } } +static void +swabHorDiff32(TIFF* tif, uint8* cp0, tmsize_t cc) +{ + uint32* wp = (uint32*) cp0; + tmsize_t wc = cc / 4; + + horDiff32(tif, cp0, cc); + + TIFFSwabArrayOfLong(wp, wc); +} + /* * Floating point predictor differencing routine. */ @@ -573,7 +603,7 @@ fpDiff(TIFF* tif, uint8* cp0, tmsize_t cc) cp = (uint8 *) cp0; cp += cc - stride - 1; for (count = cc; count > stride; count -= stride) - REPEAT4(stride, cp[stride] -= cp[0]; cp--) + REPEAT4(stride, cp[stride] = (unsigned char)((cp[stride] - cp[0])&0xff); cp--) } static int |