Function mtree_buffer_to_string

alpm-mtree/src/utils.rs:26–38

Creates a [`String`] from a byte vector which may be gzip compressed. If `buffer` contains gzip compressed data, it decompressed before converting it into a `String`. Detects whether `buffer` contains gzip compressed data by checking if it is longer than two bytes and whether the first two bytes are the [`GZIP_MAGIC_NUMBER`]. # Errors Returns an error if - `buffer` contains invalid gzip compres

(buffer: Vec<u8>)

/// - `buffer` contains invalid gzip compressed data
/// - or `buffer` can not be converted to `String`.
pub fn mtree_buffer_to_string(buffer: Vec<u8>) -> Result<String, Error> {
    if buffer.len() >= 2 && [buffer[0], buffer[1]] == GZIP_MAGIC_NUMBER {
        let mut decoder = GzDecoder::new(buffer.as_slice());

        let mut content = String::new();
        decoder
            .read_to_string(&mut content)
            .map_err(Error::InvalidGzip)?;
        Ok(content)
    } else {
        Ok(String::from_utf8(buffer)?)
    }
}