Function pread_alloc

block/src/qcow_common.rs:50–54

Allocate a buffer and pread exactly `len` bytes at `offset`.

(fd: RawFd, offset: u64, len: usize)

/// Allocate a buffer and pread exactly `len` bytes at `offset`.
pub fn pread_alloc(fd: RawFd, offset: u64, len: usize) -> io::Result<Vec<u8>> {
    let mut buf = vec![0u8; len];
    pread_exact(fd, &mut buf, offset)?;
    Ok(buf)
}

/// Decompress a full QCOW2 cluster from compressed data.
///