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JP2: fix possible Undefined-shift

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This commit is contained in:
Mirco Miranda
2026-03-04 08:15:48 +01:00
parent 5eb09116b0
commit 836e0a53bb
1 changed files with 4 additions and 3 deletions
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7
src/imageformats/jp2.cpp
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@ -269,10 +269,11 @@ public:
// discriminate between int and float (avoid complicating things by creating classes with template specializations)
if (std::numeric_limits<T>::is_integer) {
auto divisor = 1;
if (jc.prec > sizeof(T) * 8) {
auto divisor = 1ull;
auto prec = std::min(size_t(jc.prec), sizeof(*jc.data) * 8);
if (prec > sizeof(T) * 8 && prec < 64) {
// convert to the wanted precision (e.g. 16-bit -> 8-bit: divisor = 65535 / 255 = 257)
divisor = std::max(1, int(((1ll << jc.prec) - 1) / ((1ll << (sizeof(T) * 8)) - 1)));
divisor = std::max(1ull, (((1ull << prec) - 1) / ((1ull << (sizeof(T) * 8)) - 1)));
}
for (qint32 y = 0, h = img->height(); y < h; ++y) {
auto ptr = reinterpret_cast<T *>(img->scanLine(y));