const CRC32_TABLE: [u32; 256] = {
let mut table = [0u32; 256];
let mut i = 0;
while i < 256 {
let mut crc = i as u32;
let mut j = 0;
while j < 8 {
if crc & 1 != 0 {
crc = (crc >> 1) ^ 0xEDB88320;
} else {
crc >>= 1;
}
j += 1;
}
table[i] = crc;
i += 1;
}
table
};
pub fn compute(data: &[u8]) -> u32 {
let mut crc = 0xFFFFFFFF_u32;
for &byte in data {
let index = ((crc ^ byte as u32) & 0xFF) as usize;
crc = (crc >> 8) ^ CRC32_TABLE[index];
}
!crc
}