globetrotter 0.0.10

Polyglot, type-safe internationalization
Documentation 
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use flate2::{Compression, write::GzEncoder};
use std::io::Write;

/// Compute the size in bytes of the gzipped representation of the given value.
///
/// # Errors
///
/// Returns an error if compression fails while writing to the encoder or
/// finishing the compressed stream.
pub fn gzipped_size(value: impl AsRef<[u8]>) -> std::io::Result<usize> {
    #[derive(Debug, Default)]
    struct ByteCounter(pub usize);

    impl std::io::Write for ByteCounter {
        fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
            self.0 += buf.len();
            Ok(buf.len())
        }

        fn flush(&mut self) -> std::io::Result<()> {
            Ok(())
        }
    }

    let writer = ByteCounter::default();
    let mut compressor = GzEncoder::new(writer, Compression::best());
    compressor.write_all(value.as_ref())?;
    let compressed_bytes = compressor.finish()?;
    Ok(compressed_bytes.0)
}