eclipse-sanitizer 0.1.0

A fast Rust CLI for sanitizing metadata from documents and images
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use anyhow::{Context, Result};
use sha2::{Digest, Sha256};
use std::fmt::Write as FmtWrite;
use std::fs::File;
use std::io::{BufReader, Read};
use std::path::Path;

pub fn hash_file(path: &Path) -> Result<String> {
    let file = File::open(path).with_context(|| format!("failed to open {} for hashing", path.display()))?;
    let mut reader = BufReader::new(file);
    let mut hasher = Sha256::new();
    let mut buffer = [0_u8; 8192];

    loop {
        let bytes_read = reader.read(&mut buffer)?;
        if bytes_read == 0 {
            break;
        }

        hasher.update(&buffer[..bytes_read]);
    }

    Ok(encode_hex(&hasher.finalize()))
}

fn encode_hex(bytes: &[u8]) -> String {
    let mut output = String::with_capacity(bytes.len() * 2);
    for byte in bytes {
        write!(&mut output, "{:02x}", byte).expect("writing to string cannot fail");
    }
    output
}