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authorValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
committerValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
commita990de90fe41456a23e58bd087d2f107d321f3a1 (patch)
tree15afc392522a9e85dc3332235e311b7d39352ea9 /vendor/flate2/src/deflate/bufread.rs
parent3d48cd3f81164bbfc1a755dc1d4a9a02f98c8ddd (diff)
downloadfparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.tar.xz
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diff --git a/vendor/flate2/src/deflate/bufread.rs b/vendor/flate2/src/deflate/bufread.rs
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-use std::io;
-use std::io::prelude::*;
-use std::mem;
-
-use crate::zio;
-use crate::{Compress, Decompress};
-
-/// A DEFLATE encoder, or compressor.
-///
-/// This structure implements a [`Read`] interface. When read from, it reads
-/// uncompressed data from the underlying [`BufRead`] and provides the compressed data.
-///
-/// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html
-/// [`BufRead`]: https://doc.rust-lang.org/std/io/trait.BufRead.html
-///
-/// # Examples
-///
-/// ```
-/// use std::io::prelude::*;
-/// use std::io;
-/// use flate2::Compression;
-/// use flate2::bufread::DeflateEncoder;
-/// use std::fs::File;
-/// use std::io::BufReader;
-///
-/// # fn main() {
-/// # println!("{:?}", open_hello_world().unwrap());
-/// # }
-/// #
-/// // Opens sample file, compresses the contents and returns a Vector
-/// fn open_hello_world() -> io::Result<Vec<u8>> {
-/// let f = File::open("examples/hello_world.txt")?;
-/// let b = BufReader::new(f);
-/// let mut deflater = DeflateEncoder::new(b, Compression::fast());
-/// let mut buffer = Vec::new();
-/// deflater.read_to_end(&mut buffer)?;
-/// Ok(buffer)
-/// }
-/// ```
-#[derive(Debug)]
-pub struct DeflateEncoder<R> {
- obj: R,
- data: Compress,
-}
-
-impl<R: BufRead> DeflateEncoder<R> {
- /// Creates a new encoder which will read uncompressed data from the given
- /// stream and emit the compressed stream.
- pub fn new(r: R, level: crate::Compression) -> DeflateEncoder<R> {
- DeflateEncoder {
- obj: r,
- data: Compress::new(level, false),
- }
- }
-}
-
-pub fn reset_encoder_data<R>(zlib: &mut DeflateEncoder<R>) {
- zlib.data.reset();
-}
-
-impl<R> DeflateEncoder<R> {
- /// Resets the state of this encoder entirely, swapping out the input
- /// stream for another.
- ///
- /// This function will reset the internal state of this encoder and replace
- /// the input stream with the one provided, returning the previous input
- /// stream. Future data read from this encoder will be the compressed
- /// version of `r`'s data.
- pub fn reset(&mut self, r: R) -> R {
- reset_encoder_data(self);
- mem::replace(&mut self.obj, r)
- }
-
- /// Acquires a reference to the underlying reader
- pub fn get_ref(&self) -> &R {
- &self.obj
- }
-
- /// Acquires a mutable reference to the underlying stream
- ///
- /// Note that mutation of the stream may result in surprising results if
- /// this encoder is continued to be used.
- pub fn get_mut(&mut self) -> &mut R {
- &mut self.obj
- }
-
- /// Consumes this encoder, returning the underlying reader.
- pub fn into_inner(self) -> R {
- self.obj
- }
-
- /// Returns the number of bytes that have been read into this compressor.
- ///
- /// Note that not all bytes read from the underlying object may be accounted
- /// for, there may still be some active buffering.
- pub fn total_in(&self) -> u64 {
- self.data.total_in()
- }
-
- /// Returns the number of bytes that the compressor has produced.
- ///
- /// Note that not all bytes may have been read yet, some may still be
- /// buffered.
- pub fn total_out(&self) -> u64 {
- self.data.total_out()
- }
-}
-
-impl<R: BufRead> Read for DeflateEncoder<R> {
- fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
- zio::read(&mut self.obj, &mut self.data, buf)
- }
-}
-
-impl<W: BufRead + Write> Write for DeflateEncoder<W> {
- fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
- self.get_mut().write(buf)
- }
-
- fn flush(&mut self) -> io::Result<()> {
- self.get_mut().flush()
- }
-}
-
-/// A DEFLATE decoder, or decompressor.
-///
-/// This structure implements a [`Read`] interface. When read from, it reads
-/// compressed data from the underlying [`BufRead`] and provides the uncompressed data.
-///
-/// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html
-/// [`BufRead`]: https://doc.rust-lang.org/std/io/trait.BufRead.html
-///
-/// # Examples
-///
-/// ```
-/// use std::io::prelude::*;
-/// use std::io;
-/// # use flate2::Compression;
-/// # use flate2::write::DeflateEncoder;
-/// use flate2::bufread::DeflateDecoder;
-///
-/// # fn main() {
-/// # let mut e = DeflateEncoder::new(Vec::new(), Compression::default());
-/// # e.write_all(b"Hello World").unwrap();
-/// # let bytes = e.finish().unwrap();
-/// # println!("{}", decode_reader(bytes).unwrap());
-/// # }
-/// // Uncompresses a Deflate Encoded vector of bytes and returns a string or error
-/// // Here &[u8] implements Read
-/// fn decode_reader(bytes: Vec<u8>) -> io::Result<String> {
-/// let mut deflater = DeflateDecoder::new(&bytes[..]);
-/// let mut s = String::new();
-/// deflater.read_to_string(&mut s)?;
-/// Ok(s)
-/// }
-/// ```
-#[derive(Debug)]
-pub struct DeflateDecoder<R> {
- obj: R,
- data: Decompress,
-}
-
-pub fn reset_decoder_data<R>(zlib: &mut DeflateDecoder<R>) {
- zlib.data = Decompress::new(false);
-}
-
-impl<R: BufRead> DeflateDecoder<R> {
- /// Creates a new decoder which will decompress data read from the given
- /// stream.
- pub fn new(r: R) -> DeflateDecoder<R> {
- DeflateDecoder {
- obj: r,
- data: Decompress::new(false),
- }
- }
-}
-
-impl<R> DeflateDecoder<R> {
- /// Resets the state of this decoder entirely, swapping out the input
- /// stream for another.
- ///
- /// This will reset the internal state of this decoder and replace the
- /// input stream with the one provided, returning the previous input
- /// stream. Future data read from this decoder will be the decompressed
- /// version of `r`'s data.
- pub fn reset(&mut self, r: R) -> R {
- reset_decoder_data(self);
- mem::replace(&mut self.obj, r)
- }
-
- /// Resets the state of this decoder's data
- ///
- /// This will reset the internal state of this decoder. It will continue
- /// reading from the same stream.
- pub fn reset_data(&mut self) {
- reset_decoder_data(self);
- }
-
- /// Acquires a reference to the underlying stream
- pub fn get_ref(&self) -> &R {
- &self.obj
- }
-
- /// Acquires a mutable reference to the underlying stream
- ///
- /// Note that mutation of the stream may result in surprising results if
- /// this decoder is continued to be used.
- pub fn get_mut(&mut self) -> &mut R {
- &mut self.obj
- }
-
- /// Consumes this decoder, returning the underlying reader.
- pub fn into_inner(self) -> R {
- self.obj
- }
-
- /// Returns the number of bytes that the decompressor has consumed.
- ///
- /// Note that this will likely be smaller than what the decompressor
- /// actually read from the underlying stream due to buffering.
- pub fn total_in(&self) -> u64 {
- self.data.total_in()
- }
-
- /// Returns the number of bytes that the decompressor has produced.
- pub fn total_out(&self) -> u64 {
- self.data.total_out()
- }
-}
-
-impl<R: BufRead> Read for DeflateDecoder<R> {
- fn read(&mut self, into: &mut [u8]) -> io::Result<usize> {
- zio::read(&mut self.obj, &mut self.data, into)
- }
-}
-
-impl<W: BufRead + Write> Write for DeflateDecoder<W> {
- fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
- self.get_mut().write(buf)
- }
-
- fn flush(&mut self) -> io::Result<()> {
- self.get_mut().flush()
- }
-}