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https://github.com/starr-dusT/yuzu-mainline
synced 2024-03-05 21:12:25 -08:00
extractbits robustness
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0078e5a338
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@ -349,14 +349,17 @@ uint ExtractBits(uvec4 payload, int offset, int bits) {
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if (bits <= 0) {
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if (bits <= 0) {
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return 0;
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return 0;
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}
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}
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int last_offset = offset + bits - 1;
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if (bits > 32) {
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int shifted_offset = offset >> 5;
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return 0;
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}
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const int last_offset = offset + bits - 1;
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const int shifted_offset = offset >> 5;
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if ((last_offset >> 5) == shifted_offset) {
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if ((last_offset >> 5) == shifted_offset) {
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return bitfieldExtract(payload[shifted_offset], offset & 31, bits);
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return bitfieldExtract(payload[shifted_offset], offset & 31, bits);
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}
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}
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int first_bits = 32 - (offset & 31);
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const int first_bits = 32 - (offset & 31);
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int result_first = int(bitfieldExtract(payload[shifted_offset], offset & 31, first_bits));
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const int result_first = int(bitfieldExtract(payload[shifted_offset], offset & 31, first_bits));
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int result_second = int(bitfieldExtract(payload[shifted_offset + 1], 0, bits - first_bits));
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const int result_second = int(bitfieldExtract(payload[shifted_offset + 1], 0, bits - first_bits));
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return result_first | (result_second << first_bits);
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return result_first | (result_second << first_bits);
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}
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}
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