Vendor things
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third-party/vendor/flate2/src/deflate/bufread.rs
vendored
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245
third-party/vendor/flate2/src/deflate/bufread.rs
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use std::io;
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use std::io::prelude::*;
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use std::mem;
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use crate::zio;
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use crate::{Compress, Decompress};
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/// A DEFLATE encoder, or compressor.
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///
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/// This structure implements a [`Read`] interface. When read from, it reads
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/// uncompressed data from the underlying [`BufRead`] and provides the compressed data.
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///
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/// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html
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/// [`BufRead`]: https://doc.rust-lang.org/std/io/trait.BufRead.html
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///
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/// # Examples
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///
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/// ```
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/// use std::io::prelude::*;
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/// use std::io;
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/// use flate2::Compression;
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/// use flate2::bufread::DeflateEncoder;
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/// use std::fs::File;
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/// use std::io::BufReader;
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///
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/// # fn main() {
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/// # println!("{:?}", open_hello_world().unwrap());
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/// # }
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/// #
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/// // Opens sample file, compresses the contents and returns a Vector
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/// fn open_hello_world() -> io::Result<Vec<u8>> {
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/// let f = File::open("examples/hello_world.txt")?;
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/// let b = BufReader::new(f);
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/// let mut deflater = DeflateEncoder::new(b, Compression::fast());
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/// let mut buffer = Vec::new();
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/// deflater.read_to_end(&mut buffer)?;
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/// Ok(buffer)
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/// }
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/// ```
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#[derive(Debug)]
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pub struct DeflateEncoder<R> {
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obj: R,
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data: Compress,
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}
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impl<R: BufRead> DeflateEncoder<R> {
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/// Creates a new encoder which will read uncompressed data from the given
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/// stream and emit the compressed stream.
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pub fn new(r: R, level: crate::Compression) -> DeflateEncoder<R> {
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DeflateEncoder {
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obj: r,
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data: Compress::new(level, false),
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}
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}
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}
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pub fn reset_encoder_data<R>(zlib: &mut DeflateEncoder<R>) {
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zlib.data.reset();
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}
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impl<R> DeflateEncoder<R> {
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/// Resets the state of this encoder entirely, swapping out the input
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/// stream for another.
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///
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/// This function will reset the internal state of this encoder and replace
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/// the input stream with the one provided, returning the previous input
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/// stream. Future data read from this encoder will be the compressed
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/// version of `r`'s data.
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pub fn reset(&mut self, r: R) -> R {
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reset_encoder_data(self);
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mem::replace(&mut self.obj, r)
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}
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/// Acquires a reference to the underlying reader
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pub fn get_ref(&self) -> &R {
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&self.obj
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}
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/// Acquires a mutable reference to the underlying stream
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///
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/// Note that mutation of the stream may result in surprising results if
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/// this encoder is continued to be used.
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pub fn get_mut(&mut self) -> &mut R {
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&mut self.obj
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}
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/// Consumes this encoder, returning the underlying reader.
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pub fn into_inner(self) -> R {
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self.obj
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}
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/// Returns the number of bytes that have been read into this compressor.
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///
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/// Note that not all bytes read from the underlying object may be accounted
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/// for, there may still be some active buffering.
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pub fn total_in(&self) -> u64 {
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self.data.total_in()
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}
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/// Returns the number of bytes that the compressor has produced.
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///
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/// Note that not all bytes may have been read yet, some may still be
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/// buffered.
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pub fn total_out(&self) -> u64 {
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self.data.total_out()
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}
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}
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impl<R: BufRead> Read for DeflateEncoder<R> {
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fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
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zio::read(&mut self.obj, &mut self.data, buf)
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}
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}
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impl<W: BufRead + Write> Write for DeflateEncoder<W> {
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fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
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self.get_mut().write(buf)
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}
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fn flush(&mut self) -> io::Result<()> {
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self.get_mut().flush()
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}
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}
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/// A DEFLATE decoder, or decompressor.
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///
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/// This structure implements a [`Read`] interface. When read from, it reads
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/// compressed data from the underlying [`BufRead`] and provides the uncompressed data.
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///
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/// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html
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/// [`BufRead`]: https://doc.rust-lang.org/std/io/trait.BufRead.html
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///
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/// # Examples
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///
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/// ```
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/// use std::io::prelude::*;
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/// use std::io;
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/// # use flate2::Compression;
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/// # use flate2::write::DeflateEncoder;
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/// use flate2::bufread::DeflateDecoder;
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///
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/// # fn main() {
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/// # let mut e = DeflateEncoder::new(Vec::new(), Compression::default());
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/// # e.write_all(b"Hello World").unwrap();
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/// # let bytes = e.finish().unwrap();
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/// # println!("{}", decode_reader(bytes).unwrap());
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/// # }
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/// // Uncompresses a Deflate Encoded vector of bytes and returns a string or error
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/// // Here &[u8] implements Read
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/// fn decode_reader(bytes: Vec<u8>) -> io::Result<String> {
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/// let mut deflater = DeflateDecoder::new(&bytes[..]);
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/// let mut s = String::new();
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/// deflater.read_to_string(&mut s)?;
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/// Ok(s)
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/// }
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/// ```
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#[derive(Debug)]
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pub struct DeflateDecoder<R> {
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obj: R,
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data: Decompress,
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}
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pub fn reset_decoder_data<R>(zlib: &mut DeflateDecoder<R>) {
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zlib.data = Decompress::new(false);
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}
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impl<R: BufRead> DeflateDecoder<R> {
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/// Creates a new decoder which will decompress data read from the given
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/// stream.
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pub fn new(r: R) -> DeflateDecoder<R> {
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DeflateDecoder {
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obj: r,
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data: Decompress::new(false),
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}
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}
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}
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impl<R> DeflateDecoder<R> {
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/// Resets the state of this decoder entirely, swapping out the input
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/// stream for another.
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///
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/// This will reset the internal state of this decoder and replace the
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/// input stream with the one provided, returning the previous input
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/// stream. Future data read from this decoder will be the decompressed
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/// version of `r`'s data.
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pub fn reset(&mut self, r: R) -> R {
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reset_decoder_data(self);
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mem::replace(&mut self.obj, r)
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}
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/// Resets the state of this decoder's data
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///
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/// This will reset the internal state of this decoder. It will continue
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/// reading from the same stream.
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pub fn reset_data(&mut self) {
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reset_decoder_data(self);
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}
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/// Acquires a reference to the underlying stream
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pub fn get_ref(&self) -> &R {
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&self.obj
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}
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/// Acquires a mutable reference to the underlying stream
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///
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/// Note that mutation of the stream may result in surprising results if
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/// this decoder is continued to be used.
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pub fn get_mut(&mut self) -> &mut R {
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&mut self.obj
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}
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/// Consumes this decoder, returning the underlying reader.
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pub fn into_inner(self) -> R {
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self.obj
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}
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/// Returns the number of bytes that the decompressor has consumed.
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///
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/// Note that this will likely be smaller than what the decompressor
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/// actually read from the underlying stream due to buffering.
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pub fn total_in(&self) -> u64 {
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self.data.total_in()
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}
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/// Returns the number of bytes that the decompressor has produced.
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pub fn total_out(&self) -> u64 {
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self.data.total_out()
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}
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}
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impl<R: BufRead> Read for DeflateDecoder<R> {
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fn read(&mut self, into: &mut [u8]) -> io::Result<usize> {
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zio::read(&mut self.obj, &mut self.data, into)
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}
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}
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impl<W: BufRead + Write> Write for DeflateDecoder<W> {
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fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
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self.get_mut().write(buf)
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}
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fn flush(&mut self) -> io::Result<()> {
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self.get_mut().flush()
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}
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}
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