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Simplify CRC32 code

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This commit is contained in:
Mathijs van de Nes 2015-06-24 08:43:41 +02:00
parent d3f0743bfa
commit 9e364698a0
1 changed files with 3 additions and 3 deletions
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6
src/crc32.rs
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@ -52,14 +52,14 @@ static CRC32_TABLE : [u32; 256] = [
/// Update the checksum prev based upon the contents of buf. /// Update the checksum prev based upon the contents of buf.
pub fn update(prev: u32, buf: &[u8]) -> u32 pub fn update(prev: u32, buf: &[u8]) -> u32
{ {
let mut crc = prev ^ !0u32; let mut crc = !prev;
for byte in buf.iter() for byte in buf.iter()
{ {
crc = CRC32_TABLE[((crc ^ (*byte as u32)) & 0xFF) as usize] ^ (crc >> 8); crc = CRC32_TABLE[(crc as u8 ^ *byte) as usize] ^ (crc >> 8);
} }
return crc ^ !0u32; !crc
} }
/// Reader that validates the CRC32 when it reaches the EOF. /// Reader that validates the CRC32 when it reaches the EOF.