Function git_features::hash::hasher

source · 
pub fn hasher(kind: Kind) -> Sha1
Available on crate features rustsha1 or fast-sha1 only.
Expand description

Produce a hasher suitable for the given kind of hash.

Examples found in repository?
src/hash.rs (line 122)
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145

pub fn bytes(
    mut read: impl std::io::Read,
    num_bytes_from_start: usize,
    kind: git_hash::Kind,
    progress: &mut impl crate::progress::Progress,
    should_interrupt: &std::sync::atomic::AtomicBool,
) -> std::io::Result<git_hash::ObjectId> {
    let mut hasher = hasher(kind);
    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());

    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)];
        read.read_exact(out)?;
        bytes_left -= out.len();
        progress.inc_by(out.len());
        hasher.update(out);
        if should_interrupt.load(std::sync::atomic::Ordering::SeqCst) {
            return Err(std::io::Error::new(std::io::ErrorKind::Other, "Interrupted"));
        }
    }

    let id = git_hash::ObjectId::from(hasher.digest());
    progress.show_throughput(start);
    Ok(id)
}