php/archived-php-src
1
0
Fork 0
mirror of https://github.com/php/php-src.git synced 2026-03-24 00:02:20 +01:00
Code Issues Packages Projects Releases Wiki Activity

random: Optimize Randomizer::getBytesFromString() (#14894)

Browse Source 
Co-authored-by: Tim Düsterhus <tim@bastelstu.be>
This commit is contained in:
Saki Takamachi
2024-07-20 22:42:47 +09:00
committed by GitHub
parent 68ae477796
commit 1fc2ddc996
1 changed files with 5 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
ext/random/randomizer.c
View File

@@ -431,6 +431,8 @@ PHP_METHOD(Random_Randomizer, getBytesFromString)
mask |= mask >> 1;
mask |= mask >> 2;
mask |= mask >> 4;
// Expand the lowest byte into all bytes.
mask *= 0x0101010101010101;
int failures = 0;
while (total_size < length) {
@@ -440,8 +442,10 @@ PHP_METHOD(Random_Randomizer, getBytesFromString)
RETURN_THROWS();
}
uint64_t offsets = result.result & mask;
for (size_t i = 0; i < result.size; i++) {
uint64_t offset = (result.result >> (i * 8)) & mask;
uint64_t offset = offsets & 0xff;
offsets >>= 8;
if (offset > max_offset) {
if (++failures > PHP_RANDOM_RANGE_ATTEMPTS) {