backseat-signed 0.1.0

Authenticate cryptographic links from a signed derivate to its source input
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use crate::errors::*;
use libflate::gzip::Decoder;
use std::io::Read;

pub const GZIP_MAGIC: &[u8] = &[0x1f, 0x8b];
pub const LZMA_MAGIC: &[u8] = &[0xfd, 0x37, 0x7a, 0x58];

pub fn decompress(mut bytes: &[u8]) -> Result<Vec<u8>> {
    if bytes.starts_with(GZIP_MAGIC) {
        debug!("Detected gzip compression");
        let mut decoder = Decoder::new(bytes)?;
        let mut buf = Vec::new();
        decoder.read_to_end(&mut buf)?;
        Ok(buf)
    } else if bytes.starts_with(LZMA_MAGIC) {
        debug!("Detected lzma compression");
        let mut buf = Vec::new();
        lzma_rs::xz_decompress(&mut bytes, &mut buf)?;
        Ok(buf)
    } else {
        bail!("Failed to detect compression algorithm")
    }
}