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Diffstat (limited to 'src/3rdparty/libtiff/libtiff/tif_predict.c')
-rw-r--r--src/3rdparty/libtiff/libtiff/tif_predict.c144
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
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-03 15:26:49 +0000