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avcodec/half2float: fix integer overflows in convertmantissa()

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This commit is contained in:
Paul B Mahol 2021-03-03 12:37:02 +01:00
parent 4dc039b4c7
commit 3be33703c6
1 changed files with 6 additions and 6 deletions
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12
libavcodec/half2float.h
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@ -23,16 +23,16 @@
static uint32_t convertmantissa(uint32_t i)
{
uint32_t m = i << 13; // Zero pad mantissa bits
uint32_t e = 0; // Zero exponent
int32_t m = i << 13; // Zero pad mantissa bits
int32_t e = 0; // Zero exponent
while (!(m & 0x00800000UL)){ // While not normalized
e -= 0x00800000UL; // Decrement exponent (1<<23)
while (!(m & 0x00800000)) { // While not normalized
e -= 0x00800000; // Decrement exponent (1<<23)
m <<= 1; // Shift mantissa
}
m &= ~0x00800000UL; // Clear leading 1 bit
e += 0x38800000UL; // Adjust bias ((127-14)<<23)
m &= ~0x00800000; // Clear leading 1 bit
e += 0x38800000; // Adjust bias ((127-14)<<23)
return m | e; // Return combined number
}