Might avoid crashes in unlikely cases, but mostly avoids ugly artefacts
for partial frames.
git-svn-id: file:///var/local/repositories/ffmpeg/trunk@18925
9553f0bf-9b14-0410-a0b8-
cfaf0461ba5b
// number of non-zero coefficients
coeff = get_bits(gb, 6);
+ if (get_bits_count(gb) + (coeff << 1) >= gb->size_in_bits)
+ return 0;
+
// normally we would only need to clear the (63 - coeff) last values,
// but since we do not know where they are we just clear the whole block
memset(block, 0, 64 * sizeof(DCTELEM));
// 4 bits per coefficient
ALIGN(4);
+ if (get_bits_count(gb) + (coeff << 2) >= gb->size_in_bits)
+ return 0;
while (coeff) {
ac = get_sbits(gb, 4);
if (ac == -8)
// 8 bits per coefficient
ALIGN(8);
+ if (get_bits_count(gb) + (coeff << 3) >= gb->size_in_bits)
+ return 0;
while (coeff) {
ac = get_sbits(gb, 8);
PUT_COEFF(ac);