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42 lines
844 B
42 lines
844 B
use super::*;
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use crc::{Hasher32, crc32};
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pub struct Crc32Checksum
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{
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hash: u32,
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}
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impl provider::ByteProvider for Crc32Checksum
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{
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fn bytes(&self) -> &[u8]
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{
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unsafe{reinterpret::bytes(&self.hash)}
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}
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fn compute<T: Read + ?Sized>(input: &mut T, done: &mut usize) -> Result<Self, error::Error>
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{
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let mut buffer = [0u8; BUFFER_SIZE];
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let mut hasher = crc32::Digest::new(crc32::IEEE);
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let mut read;
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while (read = input.read(&mut buffer[..])?, read!=0).1
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{
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hasher.write(&buffer[..read]);
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*done += read;
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}
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Ok(Self{hash: hasher.sum32()})
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}
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}
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use std::fmt;
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impl fmt::Display for Crc32Checksum
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{
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
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{
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write!(f, "Crc32checksum (")?;
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for b in provider::ByteProvider::bytes(self) {
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write!(f, "{:02x}", *b)?;
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}
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write!(f, ")")
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}
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}
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