| <!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/zio.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>zio.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>std::mem; |
| |
| <span class="kw">use crate</span>::{Compress, Decompress, DecompressError, FlushCompress, FlushDecompress, Status}; |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>Writer<W: Write, D: Ops> { |
| obj: <span class="prelude-ty">Option</span><W>, |
| <span class="kw">pub </span>data: D, |
| buf: Vec<u8>, |
| } |
| |
| <span class="kw">pub trait </span>Ops { |
| <span class="kw">type </span>Flush: Flush; |
| <span class="kw">fn </span>total_in(<span class="kw-2">&</span><span class="self">self</span>) -> u64; |
| <span class="kw">fn </span>total_out(<span class="kw-2">&</span><span class="self">self</span>) -> u64; |
| <span class="kw">fn </span>run( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| input: <span class="kw-2">&</span>[u8], |
| output: <span class="kw-2">&mut </span>[u8], |
| flush: <span class="self">Self</span>::Flush, |
| ) -> <span class="prelude-ty">Result</span><Status, DecompressError>; |
| <span class="kw">fn </span>run_vec( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| input: <span class="kw-2">&</span>[u8], |
| output: <span class="kw-2">&mut </span>Vec<u8>, |
| flush: <span class="self">Self</span>::Flush, |
| ) -> <span class="prelude-ty">Result</span><Status, DecompressError>; |
| } |
| |
| <span class="kw">impl </span>Ops <span class="kw">for </span>Compress { |
| <span class="kw">type </span>Flush = FlushCompress; |
| <span class="kw">fn </span>total_in(<span class="kw-2">&</span><span class="self">self</span>) -> u64 { |
| <span class="self">self</span>.total_in() |
| } |
| <span class="kw">fn </span>total_out(<span class="kw-2">&</span><span class="self">self</span>) -> u64 { |
| <span class="self">self</span>.total_out() |
| } |
| <span class="kw">fn </span>run( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| input: <span class="kw-2">&</span>[u8], |
| output: <span class="kw-2">&mut </span>[u8], |
| flush: FlushCompress, |
| ) -> <span class="prelude-ty">Result</span><Status, DecompressError> { |
| <span class="prelude-val">Ok</span>(<span class="self">self</span>.compress(input, output, flush).unwrap()) |
| } |
| <span class="kw">fn </span>run_vec( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| input: <span class="kw-2">&</span>[u8], |
| output: <span class="kw-2">&mut </span>Vec<u8>, |
| flush: FlushCompress, |
| ) -> <span class="prelude-ty">Result</span><Status, DecompressError> { |
| <span class="prelude-val">Ok</span>(<span class="self">self</span>.compress_vec(input, output, flush).unwrap()) |
| } |
| } |
| |
| <span class="kw">impl </span>Ops <span class="kw">for </span>Decompress { |
| <span class="kw">type </span>Flush = FlushDecompress; |
| <span class="kw">fn </span>total_in(<span class="kw-2">&</span><span class="self">self</span>) -> u64 { |
| <span class="self">self</span>.total_in() |
| } |
| <span class="kw">fn </span>total_out(<span class="kw-2">&</span><span class="self">self</span>) -> u64 { |
| <span class="self">self</span>.total_out() |
| } |
| <span class="kw">fn </span>run( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| input: <span class="kw-2">&</span>[u8], |
| output: <span class="kw-2">&mut </span>[u8], |
| flush: FlushDecompress, |
| ) -> <span class="prelude-ty">Result</span><Status, DecompressError> { |
| <span class="self">self</span>.decompress(input, output, flush) |
| } |
| <span class="kw">fn </span>run_vec( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| input: <span class="kw-2">&</span>[u8], |
| output: <span class="kw-2">&mut </span>Vec<u8>, |
| flush: FlushDecompress, |
| ) -> <span class="prelude-ty">Result</span><Status, DecompressError> { |
| <span class="self">self</span>.decompress_vec(input, output, flush) |
| } |
| } |
| |
| <span class="kw">pub trait </span>Flush { |
| <span class="kw">fn </span>none() -> <span class="self">Self</span>; |
| <span class="kw">fn </span>sync() -> <span class="self">Self</span>; |
| <span class="kw">fn </span>finish() -> <span class="self">Self</span>; |
| } |
| |
| <span class="kw">impl </span>Flush <span class="kw">for </span>FlushCompress { |
| <span class="kw">fn </span>none() -> <span class="self">Self </span>{ |
| FlushCompress::None |
| } |
| |
| <span class="kw">fn </span>sync() -> <span class="self">Self </span>{ |
| FlushCompress::Sync |
| } |
| |
| <span class="kw">fn </span>finish() -> <span class="self">Self </span>{ |
| FlushCompress::Finish |
| } |
| } |
| |
| <span class="kw">impl </span>Flush <span class="kw">for </span>FlushDecompress { |
| <span class="kw">fn </span>none() -> <span class="self">Self </span>{ |
| FlushDecompress::None |
| } |
| |
| <span class="kw">fn </span>sync() -> <span class="self">Self </span>{ |
| FlushDecompress::Sync |
| } |
| |
| <span class="kw">fn </span>finish() -> <span class="self">Self </span>{ |
| FlushDecompress::Finish |
| } |
| } |
| |
| <span class="kw">pub fn </span>read<R, D>(obj: <span class="kw-2">&mut </span>R, data: <span class="kw-2">&mut </span>D, dst: <span class="kw-2">&mut </span>[u8]) -> io::Result<usize> |
| <span class="kw">where |
| </span>R: BufRead, |
| D: Ops, |
| { |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>(read, consumed, ret, eof); |
| { |
| <span class="kw">let </span>input = obj.fill_buf()<span class="question-mark">?</span>; |
| eof = input.is_empty(); |
| <span class="kw">let </span>before_out = data.total_out(); |
| <span class="kw">let </span>before_in = data.total_in(); |
| <span class="kw">let </span>flush = <span class="kw">if </span>eof { |
| D::Flush::finish() |
| } <span class="kw">else </span>{ |
| D::Flush::none() |
| }; |
| ret = data.run(input, dst, flush); |
| read = (data.total_out() - before_out) <span class="kw">as </span>usize; |
| consumed = (data.total_in() - before_in) <span class="kw">as </span>usize; |
| } |
| obj.consume(consumed); |
| |
| <span class="kw">match </span>ret { |
| <span class="comment">// If we haven't ready any data and we haven't hit EOF yet, |
| // then we need to keep asking for more data because if we |
| // return that 0 bytes of data have been read then it will |
| // be interpreted as EOF. |
| </span><span class="prelude-val">Ok</span>(Status::Ok | Status::BufError) <span class="kw">if </span>read == <span class="number">0 </span>&& !eof && !dst.is_empty() => <span class="kw">continue</span>, |
| <span class="prelude-val">Ok</span>(Status::Ok | Status::BufError | Status::StreamEnd) => <span class="kw">return </span><span class="prelude-val">Ok</span>(read), |
| |
| <span class="prelude-val">Err</span>(..) => { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(io::Error::new( |
| io::ErrorKind::InvalidInput, |
| <span class="string">"corrupt deflate stream"</span>, |
| )) |
| } |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><W: Write, D: Ops> Writer<W, D> { |
| <span class="kw">pub fn </span>new(w: W, d: D) -> Writer<W, D> { |
| Writer { |
| obj: <span class="prelude-val">Some</span>(w), |
| data: d, |
| buf: Vec::with_capacity(<span class="number">32 </span>* <span class="number">1024</span>), |
| } |
| } |
| |
| <span class="kw">pub fn </span>finish(<span class="kw-2">&mut </span><span class="self">self</span>) -> io::Result<()> { |
| <span class="kw">loop </span>{ |
| <span class="self">self</span>.dump()<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>before = <span class="self">self</span>.data.total_out(); |
| <span class="self">self</span>.data.run_vec(<span class="kw-2">&</span>[], <span class="kw-2">&mut </span><span class="self">self</span>.buf, D::Flush::finish())<span class="question-mark">?</span>; |
| <span class="kw">if </span>before == <span class="self">self</span>.data.total_out() { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(()); |
| } |
| } |
| } |
| |
| <span class="kw">pub fn </span>replace(<span class="kw-2">&mut </span><span class="self">self</span>, w: W) -> W { |
| <span class="self">self</span>.buf.truncate(<span class="number">0</span>); |
| mem::replace(<span class="self">self</span>.get_mut(), w) |
| } |
| |
| <span class="kw">pub fn </span>get_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>W { |
| <span class="self">self</span>.obj.as_ref().unwrap() |
| } |
| |
| <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>W { |
| <span class="self">self</span>.obj.as_mut().unwrap() |
| } |
| |
| <span class="comment">// Note that this should only be called if the outer object is just about |
| // to be consumed! |
| // |
| // (e.g. an implementation of `into_inner`) |
| </span><span class="kw">pub fn </span>take_inner(<span class="kw-2">&mut </span><span class="self">self</span>) -> W { |
| <span class="self">self</span>.obj.take().unwrap() |
| } |
| |
| <span class="kw">pub fn </span>is_present(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.obj.is_some() |
| } |
| |
| <span class="comment">// Returns total written bytes and status of underlying codec |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>write_with_status(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&</span>[u8]) -> io::Result<(usize, Status)> { |
| <span class="comment">// miniz isn't guaranteed to actually write any of the buffer provided, |
| // it may be in a flushing mode where it's just giving us data before |
| // we're actually giving it any data. We don't want to spuriously return |
| // `Ok(0)` when possible as it will cause calls to write_all() to fail. |
| // As a result we execute this in a loop to ensure that we try our |
| // darndest to write the data. |
| </span><span class="kw">loop </span>{ |
| <span class="self">self</span>.dump()<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>before_in = <span class="self">self</span>.data.total_in(); |
| <span class="kw">let </span>ret = <span class="self">self</span>.data.run_vec(buf, <span class="kw-2">&mut </span><span class="self">self</span>.buf, D::Flush::none()); |
| <span class="kw">let </span>written = (<span class="self">self</span>.data.total_in() - before_in) <span class="kw">as </span>usize; |
| <span class="kw">let </span>is_stream_end = <span class="macro">matches!</span>(ret, <span class="prelude-val">Ok</span>(Status::StreamEnd)); |
| |
| <span class="kw">if </span>!buf.is_empty() && written == <span class="number">0 </span>&& ret.is_ok() && !is_stream_end { |
| <span class="kw">continue</span>; |
| } |
| <span class="kw">return match </span>ret { |
| <span class="prelude-val">Ok</span>(st) => <span class="kw">match </span>st { |
| Status::Ok | Status::BufError | Status::StreamEnd => <span class="prelude-val">Ok</span>((written, st)), |
| }, |
| <span class="prelude-val">Err</span>(..) => <span class="prelude-val">Err</span>(io::Error::new( |
| io::ErrorKind::InvalidInput, |
| <span class="string">"corrupt deflate stream"</span>, |
| )), |
| }; |
| } |
| } |
| |
| <span class="kw">fn </span>dump(<span class="kw-2">&mut </span><span class="self">self</span>) -> io::Result<()> { |
| <span class="comment">// TODO: should manage this buffer not with `drain` but probably more of |
| // a deque-like strategy. |
| </span><span class="kw">while </span>!<span class="self">self</span>.buf.is_empty() { |
| <span class="kw">let </span>n = <span class="self">self</span>.obj.as_mut().unwrap().write(<span class="kw-2">&</span><span class="self">self</span>.buf)<span class="question-mark">?</span>; |
| <span class="kw">if </span>n == <span class="number">0 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(io::ErrorKind::WriteZero.into()); |
| } |
| <span class="self">self</span>.buf.drain(..n); |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">impl</span><W: Write, D: Ops> Write <span class="kw">for </span>Writer<W, D> { |
| <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>.write_with_status(buf).map(|res| res.<span class="number">0</span>) |
| } |
| |
| <span class="kw">fn </span>flush(<span class="kw-2">&mut </span><span class="self">self</span>) -> io::Result<()> { |
| <span class="self">self</span>.data |
| .run_vec(<span class="kw-2">&</span>[], <span class="kw-2">&mut </span><span class="self">self</span>.buf, D::Flush::sync()) |
| .unwrap(); |
| |
| <span class="comment">// Unfortunately miniz doesn't actually tell us when we're done with |
| // pulling out all the data from the internal stream. To remedy this we |
| // have to continually ask the stream for more memory until it doesn't |
| // give us a chunk of memory the same size as our own internal buffer, |
| // at which point we assume it's reached the end. |
| </span><span class="kw">loop </span>{ |
| <span class="self">self</span>.dump()<span class="question-mark">?</span>; |
| <span class="kw">let </span>before = <span class="self">self</span>.data.total_out(); |
| <span class="self">self</span>.data |
| .run_vec(<span class="kw-2">&</span>[], <span class="kw-2">&mut </span><span class="self">self</span>.buf, D::Flush::none()) |
| .unwrap(); |
| <span class="kw">if </span>before == <span class="self">self</span>.data.total_out() { |
| <span class="kw">break</span>; |
| } |
| } |
| |
| <span class="self">self</span>.obj.as_mut().unwrap().flush() |
| } |
| } |
| |
| <span class="kw">impl</span><W: Write, D: Ops> Drop <span class="kw">for </span>Writer<W, D> { |
| <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">if </span><span class="self">self</span>.obj.is_some() { |
| <span class="kw">let _ </span>= <span class="self">self</span>.finish(); |
| } |
| } |
| } |
| </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> |