| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/flate2-1.0.26/src/gz/read.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>read.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../flate2/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../flate2/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span>std::io; |
| <span class="kw">use </span>std::io::prelude::<span class="kw-2">*</span>; |
| |
| <span class="kw">use </span><span class="kw">super</span>::bufread; |
| <span class="kw">use super</span>::{GzBuilder, GzHeader}; |
| <span class="kw">use </span><span class="kw">crate</span>::bufreader::BufReader; |
| <span class="kw">use </span><span class="kw">crate</span>::Compression; |
| |
| <span class="doccomment">/// A gzip streaming encoder |
| /// |
| /// This structure exposes a [`Read`] interface that will read uncompressed data |
| /// from the underlying reader and expose the compressed version as a [`Read`] |
| /// interface. |
| /// |
| /// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use std::io::prelude::*; |
| /// use std::io; |
| /// use flate2::Compression; |
| /// use flate2::read::GzEncoder; |
| /// |
| /// // Return a vector containing the GZ compressed version of hello world |
| /// |
| /// fn gzencode_hello_world() -> io::Result<Vec<u8>> { |
| /// let mut ret_vec = [0;100]; |
| /// let bytestring = b"hello world"; |
| /// let mut gz = GzEncoder::new(&bytestring[..], Compression::fast()); |
| /// let count = gz.read(&mut ret_vec)?; |
| /// Ok(ret_vec[0..count].to_vec()) |
| /// } |
| /// ``` |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>GzEncoder<R> { |
| inner: bufread::GzEncoder<BufReader<R>>, |
| } |
| |
| <span class="kw">pub fn </span>gz_encoder<R: Read>(inner: bufread::GzEncoder<BufReader<R>>) -> GzEncoder<R> { |
| GzEncoder { inner } |
| } |
| |
| <span class="kw">impl</span><R: Read> GzEncoder<R> { |
| <span class="doccomment">/// Creates a new encoder which will use the given compression level. |
| /// |
| /// The encoder is not configured specially for the emitted header. For |
| /// header configuration, see the `GzBuilder` type. |
| /// |
| /// The data read from the stream `r` will be compressed and available |
| /// through the returned reader. |
| </span><span class="kw">pub fn </span>new(r: R, level: Compression) -> GzEncoder<R> { |
| GzBuilder::new().read(r, level) |
| } |
| } |
| |
| <span class="kw">impl</span><R> GzEncoder<R> { |
| <span class="doccomment">/// Acquires a reference to the underlying reader. |
| </span><span class="kw">pub fn </span>get_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>R { |
| <span class="self">self</span>.inner.get_ref().get_ref() |
| } |
| |
| <span class="doccomment">/// Acquires a mutable reference to the underlying reader. |
| /// |
| /// Note that mutation of the reader may result in surprising results if |
| /// this encoder is continued to be used. |
| </span><span class="kw">pub fn </span>get_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>R { |
| <span class="self">self</span>.inner.get_mut().get_mut() |
| } |
| |
| <span class="doccomment">/// Returns the underlying stream, consuming this encoder |
| </span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -> R { |
| <span class="self">self</span>.inner.into_inner().into_inner() |
| } |
| } |
| |
| <span class="kw">impl</span><R: Read> Read <span class="kw">for </span>GzEncoder<R> { |
| <span class="kw">fn </span>read(<span class="kw-2">&mut </span><span class="self">self</span>, into: <span class="kw-2">&mut </span>[u8]) -> io::Result<usize> { |
| <span class="self">self</span>.inner.read(into) |
| } |
| } |
| |
| <span class="kw">impl</span><R: Read + Write> Write <span class="kw">for </span>GzEncoder<R> { |
| <span class="kw">fn </span>write(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&</span>[u8]) -> io::Result<usize> { |
| <span class="self">self</span>.get_mut().write(buf) |
| } |
| |
| <span class="kw">fn </span>flush(<span class="kw-2">&mut </span><span class="self">self</span>) -> io::Result<()> { |
| <span class="self">self</span>.get_mut().flush() |
| } |
| } |
| |
| <span class="doccomment">/// A gzip streaming decoder |
| /// |
| /// This structure exposes a [`Read`] interface that will consume compressed |
| /// data from the underlying reader and emit uncompressed data. |
| /// |
| /// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// |
| /// use std::io::prelude::*; |
| /// use std::io; |
| /// # use flate2::Compression; |
| /// # use flate2::write::GzEncoder; |
| /// use flate2::read::GzDecoder; |
| /// |
| /// # fn main() { |
| /// # let mut e = GzEncoder::new(Vec::new(), Compression::default()); |
| /// # e.write_all(b"Hello World").unwrap(); |
| /// # let bytes = e.finish().unwrap(); |
| /// # println!("{}", decode_reader(bytes).unwrap()); |
| /// # } |
| /// # |
| /// // Uncompresses a Gz 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 gz = GzDecoder::new(&bytes[..]); |
| /// let mut s = String::new(); |
| /// gz.read_to_string(&mut s)?; |
| /// Ok(s) |
| /// } |
| /// ``` |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>GzDecoder<R> { |
| inner: bufread::GzDecoder<BufReader<R>>, |
| } |
| |
| <span class="kw">impl</span><R: Read> GzDecoder<R> { |
| <span class="doccomment">/// Creates a new decoder from the given reader, immediately parsing the |
| /// gzip header. |
| </span><span class="kw">pub fn </span>new(r: R) -> GzDecoder<R> { |
| GzDecoder { |
| inner: bufread::GzDecoder::new(BufReader::new(r)), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><R> GzDecoder<R> { |
| <span class="doccomment">/// Returns the header associated with this stream, if it was valid. |
| </span><span class="kw">pub fn </span>header(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>GzHeader> { |
| <span class="self">self</span>.inner.header() |
| } |
| |
| <span class="doccomment">/// Acquires a reference to the underlying reader. |
| </span><span class="kw">pub fn </span>get_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>R { |
| <span class="self">self</span>.inner.get_ref().get_ref() |
| } |
| |
| <span class="doccomment">/// 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. |
| </span><span class="kw">pub fn </span>get_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>R { |
| <span class="self">self</span>.inner.get_mut().get_mut() |
| } |
| |
| <span class="doccomment">/// Consumes this decoder, returning the underlying reader. |
| </span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -> R { |
| <span class="self">self</span>.inner.into_inner().into_inner() |
| } |
| } |
| |
| <span class="kw">impl</span><R: Read> Read <span class="kw">for </span>GzDecoder<R> { |
| <span class="kw">fn </span>read(<span class="kw-2">&mut </span><span class="self">self</span>, into: <span class="kw-2">&mut </span>[u8]) -> io::Result<usize> { |
| <span class="self">self</span>.inner.read(into) |
| } |
| } |
| |
| <span class="kw">impl</span><R: Read + Write> Write <span class="kw">for </span>GzDecoder<R> { |
| <span class="kw">fn </span>write(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&</span>[u8]) -> io::Result<usize> { |
| <span class="self">self</span>.get_mut().write(buf) |
| } |
| |
| <span class="kw">fn </span>flush(<span class="kw-2">&mut </span><span class="self">self</span>) -> io::Result<()> { |
| <span class="self">self</span>.get_mut().flush() |
| } |
| } |
| |
| <span class="doccomment">/// A gzip streaming decoder that decodes all members of a multistream |
| /// |
| /// A gzip member consists of a header, compressed data and a trailer. The [gzip |
| /// specification](https://tools.ietf.org/html/rfc1952), however, allows multiple |
| /// gzip members to be joined in a single stream. `MultiGzDecoder` will |
| /// decode all consecutive members while `GzDecoder` will only decompress the |
| /// first gzip member. The multistream format is commonly used in bioinformatics, |
| /// for example when using the BGZF compressed data. |
| /// |
| /// This structure exposes a [`Read`] interface that will consume all gzip members |
| /// from the underlying reader and emit uncompressed data. |
| /// |
| /// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use std::io::prelude::*; |
| /// use std::io; |
| /// # use flate2::Compression; |
| /// # use flate2::write::GzEncoder; |
| /// use flate2::read::MultiGzDecoder; |
| /// |
| /// # fn main() { |
| /// # let mut e = GzEncoder::new(Vec::new(), Compression::default()); |
| /// # e.write_all(b"Hello World").unwrap(); |
| /// # let bytes = e.finish().unwrap(); |
| /// # println!("{}", decode_reader(bytes).unwrap()); |
| /// # } |
| /// # |
| /// // Uncompresses a Gz 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 gz = MultiGzDecoder::new(&bytes[..]); |
| /// let mut s = String::new(); |
| /// gz.read_to_string(&mut s)?; |
| /// Ok(s) |
| /// } |
| /// ``` |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>MultiGzDecoder<R> { |
| inner: bufread::MultiGzDecoder<BufReader<R>>, |
| } |
| |
| <span class="kw">impl</span><R: Read> MultiGzDecoder<R> { |
| <span class="doccomment">/// Creates a new decoder from the given reader, immediately parsing the |
| /// (first) gzip header. If the gzip stream contains multiple members all will |
| /// be decoded. |
| </span><span class="kw">pub fn </span>new(r: R) -> MultiGzDecoder<R> { |
| MultiGzDecoder { |
| inner: bufread::MultiGzDecoder::new(BufReader::new(r)), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><R> MultiGzDecoder<R> { |
| <span class="doccomment">/// Returns the current header associated with this stream, if it's valid. |
| </span><span class="kw">pub fn </span>header(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>GzHeader> { |
| <span class="self">self</span>.inner.header() |
| } |
| |
| <span class="doccomment">/// Acquires a reference to the underlying reader. |
| </span><span class="kw">pub fn </span>get_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>R { |
| <span class="self">self</span>.inner.get_ref().get_ref() |
| } |
| |
| <span class="doccomment">/// 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. |
| </span><span class="kw">pub fn </span>get_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>R { |
| <span class="self">self</span>.inner.get_mut().get_mut() |
| } |
| |
| <span class="doccomment">/// Consumes this decoder, returning the underlying reader. |
| </span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -> R { |
| <span class="self">self</span>.inner.into_inner().into_inner() |
| } |
| } |
| |
| <span class="kw">impl</span><R: Read> Read <span class="kw">for </span>MultiGzDecoder<R> { |
| <span class="kw">fn </span>read(<span class="kw-2">&mut </span><span class="self">self</span>, into: <span class="kw-2">&mut </span>[u8]) -> io::Result<usize> { |
| <span class="self">self</span>.inner.read(into) |
| } |
| } |
| |
| <span class="kw">impl</span><R: Read + Write> Write <span class="kw">for </span>MultiGzDecoder<R> { |
| <span class="kw">fn </span>write(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&</span>[u8]) -> io::Result<usize> { |
| <span class="self">self</span>.get_mut().write(buf) |
| } |
| |
| <span class="kw">fn </span>flush(<span class="kw-2">&mut </span><span class="self">self</span>) -> io::Result<()> { |
| <span class="self">self</span>.get_mut().flush() |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="flate2" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
