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Fix JBIG decoder.

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Signed-off-by: yzrh <yzrh@noema.org>
This commit is contained in:
yzrh 2022-12-31 21:17:28 +00:00
parent 3ac51d66b9
commit bffb8ce8a4
1 changed files with 11 additions and 0 deletions
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11
src/jbig.c
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@ -209,6 +209,17 @@ _procline(int line, char *a, char *b, char *c)
/* The encoder must be erroneous */
uint16_t cx = 0;
if (line > 0) {
cx += (_ret[_width_padded * (_height - line)] & 0x20) << 2;
cx += _ret[_width_padded * (_height - line)] & 0x40;
cx += (_ret[_width_padded * (_height - line)] & 0x80) >> 2;
}
if (line > 1) {
cx += (_ret[_width_padded * (_height - line + 1)] & 0x40) >> 4;
cx += (_ret[_width_padded * (_height - line + 1)] & 0x80) >> 6;
}
for (int i = 0; i < _width; i++) {
_decode(cx);