#[cfg(not(feature = "fast-sha1"))]mod _impl { use super::Sha1Digest; #[derive(Default, Clone)] pub struct Sha1(sha1::Sha1); impl Sha1 { pub fn update(&mut self, d: &[u8]) { self.0.update(d) } pub fn digest(self) -> Sha1Digest { self.0.digest().bytes() } }} pub type Sha1Digest = [u8; 20]; #[cfg(feature = "fast-sha1")]mod _impl { use super::Sha1Digest; use fastsha1::Digest; #[derive(Default, Clone)] pub struct Sha1(fastsha1::Sha1); impl Sha1 { pub fn update(&mut self, d: &[u8]) { self.0.update(d) } pub fn digest(self) -> Sha1Digest { self.0.finalize().into() } }} pub use _impl::Sha1; pub fn crc32_update(previous_value: u32, bytes: &[u8]) -> u32 { crc::crc32::update(previous_value, &crc::crc32::IEEE_TABLE, bytes)}pub use crc::crc32::checksum_ieee as crc32; #[cfg(feature = "git-object")]pub fn bytes_of_file( path: impl AsRef<std::path::Path>, num_bytes_from_start: usize, kind: git_object::HashKind, progress: &mut impl crate::progress::Progress,) -> std::io::Result<git_object::owned::Id> { let mut hasher = match kind { git_object::HashKind::Sha1 => crate::hash::Sha1::default(), }; let start = std::time::Instant::now(); // init progress before the possibility for failure, as convenience in case people want to recover progress.init(Some(num_bytes_from_start), crate::progress::bytes()); let mut file = std::fs::File::open(path)?; use std::io::Read; const BUF_SIZE: usize = u16::MAX as usize; let mut buf = [0u8; BUF_SIZE]; let mut bytes_left = num_bytes_from_start; while bytes_left > 0 { let out = &mut buf[..BUF_SIZE.min(bytes_left)]; file.read_exact(out)?; bytes_left -= out.len(); progress.inc_by(out.len()); hasher.update(out); if crate::interrupt::is_triggered() { return Err(std::io::Error::new(std::io::ErrorKind::Other, "Interrupted")); } } let id = git_object::owned::Id::new_sha1(hasher.digest()); progress.show_throughput(start); Ok(id)}
#[cfg(not(feature = "fast-sha1"))]
mod _impl {
use super::Sha1Digest;
#[derive(Default, Clone)]
pub struct Sha1(sha1::Sha1);
impl Sha1 {
pub fn update(&mut self, d: &[u8]) {
self.0.update(d)
}
pub fn digest(self) -> Sha1Digest {
self.0.digest().bytes()
}
}
}
pub type Sha1Digest = [u8; 20];
#[cfg(feature = "fast-sha1")]
mod _impl {
use super::Sha1Digest;
use fastsha1::Digest;
#[derive(Default, Clone)]
pub struct Sha1(fastsha1::Sha1);
impl Sha1 {
pub fn update(&mut self, d: &[u8]) {
self.0.update(d)
}
pub fn digest(self) -> Sha1Digest {
self.0.finalize().into()
}
}
}
pub use _impl::Sha1;
pub fn crc32_update(previous_value: u32, bytes: &[u8]) -> u32 {
crc::crc32::update(previous_value, &crc::crc32::IEEE_TABLE, bytes)
}
pub use crc::crc32::checksum_ieee as crc32;
#[cfg(feature = "git-object")]
pub fn bytes_of_file(
path: impl AsRef<std::path::Path>,
num_bytes_from_start: usize,
kind: git_object::HashKind,
progress: &mut impl crate::progress::Progress,
) -> std::io::Result<git_object::owned::Id> {
let mut hasher = match kind {
git_object::HashKind::Sha1 => crate::hash::Sha1::default(),
};
let start = std::time::Instant::now();
// init progress before the possibility for failure, as convenience in case people want to recover
progress.init(Some(num_bytes_from_start), crate::progress::bytes());
let mut file = std::fs::File::open(path)?;
use std::io::Read;
const BUF_SIZE: usize = u16::MAX as usize;
let mut buf = [0u8; BUF_SIZE];
let mut bytes_left = num_bytes_from_start;
while bytes_left > 0 {
let out = &mut buf[..BUF_SIZE.min(bytes_left)];
file.read_exact(out)?;
bytes_left -= out.len();
progress.inc_by(out.len());
hasher.update(out);
if crate::interrupt::is_triggered() {
return Err(std::io::Error::new(std::io::ErrorKind::Other, "Interrupted"));
}
}
let id = git_object::owned::Id::new_sha1(hasher.digest());
progress.show_throughput(start);
Ok(id)
}