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avcodec/pixlet: Simplify pfx computation

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Found by reviewing code related to CID1604365 Overflowed constant

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2024-07-05 02:21:56 +02:00
parent f18b442370
commit 0474614e6c
1 changed files with 2 additions and 2 deletions
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4
libavcodec/pixlet.c
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@ -231,8 +231,8 @@ static int read_high_coeffs(AVCodecContext *avctx, const uint8_t *src, int16_t *
if (cnt1 >= length) { if (cnt1 >= length) {
cnt1 = get_bits(bc, nbits); cnt1 = get_bits(bc, nbits);
} else { } else {
pfx = 14 + ((((uint64_t)(value - 14)) >> 32) & (value - 14)); pfx = FFMIN(value, 14);
if (pfx < 1 || pfx > 25) if (pfx < 1)
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
cnt1 *= (1 << pfx) - 1; cnt1 *= (1 << pfx) - 1;
shbits = show_bits(bc, pfx); shbits = show_bits(bc, pfx);