Function decompress_cluster

block/src/qcow_common.rs:61–74

Decompress a full QCOW2 cluster from compressed data. Returns a `cluster_size` byte buffer with the decompressed cluster content. Fails if the decoder does not produce exactly `cluster_size` bytes.

(
    compressed: &[u8],
    cluster_size: usize,
    decoder: &dyn Decoder,
)

/// content. Fails if the decoder does not produce exactly `cluster_size`
/// bytes.
pub fn decompress_cluster(
    compressed: &[u8],
    cluster_size: usize,
    decoder: &dyn Decoder,
) -> io::Result<Vec<u8>> {
    let mut decompressed = vec![0u8; cluster_size];
    let n = decoder
        .decode(compressed, &mut decompressed)
        .map_err(|_| io::Error::from_raw_os_error(libc::EIO))?;
    if n != cluster_size {
        return Err(io::Error::from_raw_os_error(libc::EIO));
    }
    Ok(decompressed)
}

/// Write all bytes to fd at offset, looping on short writes.
pub fn pwrite_all(fd: RawFd, buf: &[u8], offset: u64) -> io::Result<()> {