| <!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/bufread.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>bufread.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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| <span id="550">550</span> |
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| <span id="552">552</span> |
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| <span id="559">559</span> |
| <span id="560">560</span> |
| <span id="561">561</span> |
| <span id="562">562</span> |
| <span id="563">563</span> |
| <span id="564">564</span> |
| <span id="565">565</span> |
| <span id="566">566</span> |
| <span id="567">567</span> |
| <span id="568">568</span> |
| <span id="569">569</span> |
| <span id="570">570</span> |
| <span id="571">571</span> |
| <span id="572">572</span> |
| <span id="573">573</span> |
| <span id="574">574</span> |
| <span id="575">575</span> |
| <span id="576">576</span> |
| <span id="577">577</span> |
| <span id="578">578</span> |
| <span id="579">579</span> |
| <span id="580">580</span> |
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| <span id="582">582</span> |
| <span id="583">583</span> |
| <span id="584">584</span> |
| <span id="585">585</span> |
| <span id="586">586</span> |
| <span id="587">587</span> |
| <span id="588">588</span> |
| <span id="589">589</span> |
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| <span id="593">593</span> |
| <span id="594">594</span> |
| <span id="595">595</span> |
| <span id="596">596</span> |
| <span id="597">597</span> |
| <span id="598">598</span> |
| <span id="599">599</span> |
| <span id="600">600</span> |
| <span id="601">601</span> |
| <span id="602">602</span> |
| <span id="603">603</span> |
| <span id="604">604</span> |
| <span id="605">605</span> |
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| <span id="608">608</span> |
| <span id="609">609</span> |
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| <span id="611">611</span> |
| <span id="612">612</span> |
| <span id="613">613</span> |
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| <span id="615">615</span> |
| <span id="616">616</span> |
| <span id="617">617</span> |
| <span id="618">618</span> |
| <span id="619">619</span> |
| <span id="620">620</span> |
| <span id="621">621</span> |
| <span id="622">622</span> |
| <span id="623">623</span> |
| <span id="624">624</span> |
| <span id="625">625</span> |
| <span id="626">626</span> |
| <span id="627">627</span> |
| <span id="628">628</span> |
| <span id="629">629</span> |
| <span id="630">630</span> |
| <span id="631">631</span> |
| <span id="632">632</span> |
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| <span id="657">657</span> |
| <span id="658">658</span> |
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| <span id="662">662</span> |
| <span id="663">663</span> |
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| <span id="666">666</span> |
| <span id="667">667</span> |
| <span id="668">668</span> |
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| <span id="670">670</span> |
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| <span id="673">673</span> |
| <span id="674">674</span> |
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| <span id="690">690</span> |
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| <span id="716">716</span> |
| <span id="717">717</span> |
| <span id="718">718</span> |
| <span id="719">719</span> |
| <span id="720">720</span> |
| <span id="721">721</span> |
| <span id="722">722</span> |
| <span id="723">723</span> |
| <span id="724">724</span> |
| <span id="725">725</span> |
| <span id="726">726</span> |
| <span id="727">727</span> |
| <span id="728">728</span> |
| <span id="729">729</span> |
| <span id="730">730</span> |
| <span id="731">731</span> |
| <span id="732">732</span> |
| <span id="733">733</span> |
| <span id="734">734</span> |
| <span id="735">735</span> |
| <span id="736">736</span> |
| <span id="737">737</span> |
| <span id="738">738</span> |
| <span id="739">739</span> |
| <span id="740">740</span> |
| <span id="741">741</span> |
| <span id="742">742</span> |
| <span id="743">743</span> |
| <span id="744">744</span> |
| <span id="745">745</span> |
| <span id="746">746</span> |
| <span id="747">747</span> |
| <span id="748">748</span> |
| <span id="749">749</span> |
| <span id="750">750</span> |
| <span id="751">751</span> |
| <span id="752">752</span> |
| <span id="753">753</span> |
| <span id="754">754</span> |
| <span id="755">755</span> |
| <span id="756">756</span> |
| <span id="757">757</span> |
| <span id="758">758</span> |
| <span id="759">759</span> |
| <span id="760">760</span> |
| <span id="761">761</span> |
| <span id="762">762</span> |
| <span id="763">763</span> |
| <span id="764">764</span> |
| <span id="765">765</span> |
| <span id="766">766</span> |
| <span id="767">767</span> |
| <span id="768">768</span> |
| <span id="769">769</span> |
| <span id="770">770</span> |
| <span id="771">771</span> |
| <span id="772">772</span> |
| <span id="773">773</span> |
| <span id="774">774</span> |
| <span id="775">775</span> |
| <span id="776">776</span> |
| <span id="777">777</span> |
| <span id="778">778</span> |
| <span id="779">779</span> |
| <span id="780">780</span> |
| <span id="781">781</span> |
| <span id="782">782</span> |
| <span id="783">783</span> |
| <span id="784">784</span> |
| <span id="785">785</span> |
| <span id="786">786</span> |
| <span id="787">787</span> |
| <span id="788">788</span> |
| <span id="789">789</span> |
| <span id="790">790</span> |
| <span id="791">791</span> |
| <span id="792">792</span> |
| <span id="793">793</span> |
| <span id="794">794</span> |
| <span id="795">795</span> |
| <span id="796">796</span> |
| <span id="797">797</span> |
| <span id="798">798</span> |
| <span id="799">799</span> |
| <span id="800">800</span> |
| <span id="801">801</span> |
| <span id="802">802</span> |
| <span id="803">803</span> |
| <span id="804">804</span> |
| <span id="805">805</span> |
| <span id="806">806</span> |
| <span id="807">807</span> |
| <span id="808">808</span> |
| <span id="809">809</span> |
| <span id="810">810</span> |
| <span id="811">811</span> |
| <span id="812">812</span> |
| <span id="813">813</span> |
| <span id="814">814</span> |
| <span id="815">815</span> |
| <span id="816">816</span> |
| <span id="817">817</span> |
| <span id="818">818</span> |
| <span id="819">819</span> |
| <span id="820">820</span> |
| <span id="821">821</span> |
| <span id="822">822</span> |
| <span id="823">823</span> |
| <span id="824">824</span> |
| <span id="825">825</span> |
| <span id="826">826</span> |
| <span id="827">827</span> |
| <span id="828">828</span> |
| <span id="829">829</span> |
| <span id="830">830</span> |
| <span id="831">831</span> |
| <span id="832">832</span> |
| <span id="833">833</span> |
| <span id="834">834</span> |
| <span id="835">835</span> |
| <span id="836">836</span> |
| <span id="837">837</span> |
| <span id="838">838</span> |
| <span id="839">839</span> |
| <span id="840">840</span> |
| <span id="841">841</span> |
| <span id="842">842</span> |
| <span id="843">843</span> |
| <span id="844">844</span> |
| <span id="845">845</span> |
| <span id="846">846</span> |
| <span id="847">847</span> |
| <span id="848">848</span> |
| <span id="849">849</span> |
| <span id="850">850</span> |
| <span id="851">851</span> |
| <span id="852">852</span> |
| </pre><pre class="rust"><code><span class="kw">use </span>std::cmp; |
| <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 super</span>::{GzBuilder, GzHeader}; |
| <span class="kw">use super</span>::{FCOMMENT, FEXTRA, FHCRC, FNAME}; |
| <span class="kw">use </span><span class="kw">crate</span>::crc::{Crc, CrcReader}; |
| <span class="kw">use </span><span class="kw">crate</span>::deflate; |
| <span class="kw">use </span><span class="kw">crate</span>::Compression; |
| |
| <span class="kw">fn </span>copy(into: <span class="kw-2">&mut </span>[u8], from: <span class="kw-2">&</span>[u8], pos: <span class="kw-2">&mut </span>usize) -> usize { |
| <span class="kw">let </span>min = cmp::min(into.len(), from.len() - <span class="kw-2">*</span>pos); |
| <span class="kw">for </span>(slot, val) <span class="kw">in </span>into.iter_mut().zip(from[<span class="kw-2">*</span>pos..<span class="kw-2">*</span>pos + min].iter()) { |
| <span class="kw-2">*</span>slot = <span class="kw-2">*</span>val; |
| } |
| <span class="kw-2">*</span>pos += min; |
| min |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>corrupt() -> io::Error { |
| io::Error::new( |
| io::ErrorKind::InvalidInput, |
| <span class="string">"corrupt gzip stream does not have a matching checksum"</span>, |
| ) |
| } |
| |
| <span class="kw">fn </span>bad_header() -> io::Error { |
| io::Error::new(io::ErrorKind::InvalidInput, <span class="string">"invalid gzip header"</span>) |
| } |
| |
| <span class="kw">fn </span>read_le_u16<R: Read>(r: <span class="kw-2">&mut </span>Buffer<R>) -> io::Result<u16> { |
| <span class="kw">let </span><span class="kw-2">mut </span>b = [<span class="number">0</span>; <span class="number">2</span>]; |
| r.read_and_forget(<span class="kw-2">&mut </span>b)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>((b[<span class="number">0</span>] <span class="kw">as </span>u16) | ((b[<span class="number">1</span>] <span class="kw">as </span>u16) << <span class="number">8</span>)) |
| } |
| |
| <span class="kw">fn </span>read_gz_header_part<<span class="lifetime">'a</span>, R: Read>(r: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Buffer<<span class="lifetime">'a</span>, R>) -> io::Result<()> { |
| <span class="kw">loop </span>{ |
| <span class="kw">match </span>r.part.state { |
| GzHeaderParsingState::Start => { |
| <span class="kw">let </span><span class="kw-2">mut </span>header = [<span class="number">0</span>; <span class="number">10</span>]; |
| r.read_and_forget(<span class="kw-2">&mut </span>header)<span class="question-mark">?</span>; |
| |
| <span class="kw">if </span>header[<span class="number">0</span>] != <span class="number">0x1f </span>|| header[<span class="number">1</span>] != <span class="number">0x8b </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(bad_header()); |
| } |
| <span class="kw">if </span>header[<span class="number">2</span>] != <span class="number">8 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(bad_header()); |
| } |
| |
| r.part.flg = header[<span class="number">3</span>]; |
| r.part.header.mtime = ((header[<span class="number">4</span>] <span class="kw">as </span>u32) << <span class="number">0</span>) |
| | ((header[<span class="number">5</span>] <span class="kw">as </span>u32) << <span class="number">8</span>) |
| | ((header[<span class="number">6</span>] <span class="kw">as </span>u32) << <span class="number">16</span>) |
| | ((header[<span class="number">7</span>] <span class="kw">as </span>u32) << <span class="number">24</span>); |
| <span class="kw">let </span>_xfl = header[<span class="number">8</span>]; |
| r.part.header.operating_system = header[<span class="number">9</span>]; |
| r.part.state = GzHeaderParsingState::Xlen; |
| } |
| GzHeaderParsingState::Xlen => { |
| <span class="kw">if </span>r.part.flg & FEXTRA != <span class="number">0 </span>{ |
| r.part.xlen = read_le_u16(r)<span class="question-mark">?</span>; |
| } |
| r.part.state = GzHeaderParsingState::Extra; |
| } |
| GzHeaderParsingState::Extra => { |
| <span class="kw">if </span>r.part.flg & FEXTRA != <span class="number">0 </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>extra = <span class="macro">vec!</span>[<span class="number">0</span>; r.part.xlen <span class="kw">as </span>usize]; |
| r.read_and_forget(<span class="kw-2">&mut </span>extra)<span class="question-mark">?</span>; |
| r.part.header.extra = <span class="prelude-val">Some</span>(extra); |
| } |
| r.part.state = GzHeaderParsingState::Filename; |
| } |
| GzHeaderParsingState::Filename => { |
| <span class="kw">if </span>r.part.flg & FNAME != <span class="number">0 </span>{ |
| <span class="kw">if </span>r.part.header.filename.is_none() { |
| r.part.header.filename = <span class="prelude-val">Some</span>(Vec::new()); |
| }; |
| <span class="kw">for </span>byte <span class="kw">in </span>r.bytes() { |
| <span class="kw">let </span>byte = byte<span class="question-mark">?</span>; |
| <span class="kw">if </span>byte == <span class="number">0 </span>{ |
| <span class="kw">break</span>; |
| } |
| } |
| } |
| r.part.state = GzHeaderParsingState::Comment; |
| } |
| GzHeaderParsingState::Comment => { |
| <span class="kw">if </span>r.part.flg & FCOMMENT != <span class="number">0 </span>{ |
| <span class="kw">if </span>r.part.header.comment.is_none() { |
| r.part.header.comment = <span class="prelude-val">Some</span>(Vec::new()); |
| }; |
| <span class="kw">for </span>byte <span class="kw">in </span>r.bytes() { |
| <span class="kw">let </span>byte = byte<span class="question-mark">?</span>; |
| <span class="kw">if </span>byte == <span class="number">0 </span>{ |
| <span class="kw">break</span>; |
| } |
| } |
| } |
| r.part.state = GzHeaderParsingState::Crc; |
| } |
| GzHeaderParsingState::Crc => { |
| <span class="kw">if </span>r.part.flg & FHCRC != <span class="number">0 </span>{ |
| <span class="kw">let </span>stored_crc = read_le_u16(r)<span class="question-mark">?</span>; |
| <span class="kw">let </span>calced_crc = r.part.crc.sum() <span class="kw">as </span>u16; |
| <span class="kw">if </span>stored_crc != calced_crc { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(corrupt()); |
| } |
| } |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(()); |
| } |
| } |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>read_gz_header<R: Read>(r: <span class="kw-2">&mut </span>R) -> io::Result<GzHeader> { |
| <span class="kw">let </span><span class="kw-2">mut </span>part = GzHeaderPartial::new(); |
| |
| <span class="kw">let </span>result = { |
| <span class="kw">let </span><span class="kw-2">mut </span>reader = Buffer::new(<span class="kw-2">&mut </span>part, r); |
| read_gz_header_part(<span class="kw-2">&mut </span>reader) |
| }; |
| result.map(|()| part.take_header()) |
| } |
| |
| <span class="doccomment">/// A gzip streaming encoder |
| /// |
| /// This structure exposes a [`BufRead`] interface that will read uncompressed data |
| /// from the underlying reader and expose the compressed version as a [`BufRead`] |
| /// interface. |
| /// |
| /// [`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::GzEncoder; |
| /// use std::fs::File; |
| /// use std::io::BufReader; |
| /// |
| /// // Opens sample file, compresses the contents and returns a Vector or error |
| /// // File wrapped in a BufReader implements BufRead |
| /// |
| /// fn open_hello_world() -> io::Result<Vec<u8>> { |
| /// let f = File::open("examples/hello_world.txt")?; |
| /// let b = BufReader::new(f); |
| /// let mut gz = GzEncoder::new(b, Compression::fast()); |
| /// let mut buffer = Vec::new(); |
| /// gz.read_to_end(&mut buffer)?; |
| /// Ok(buffer) |
| /// } |
| /// ``` |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>GzEncoder<R> { |
| inner: deflate::bufread::DeflateEncoder<CrcReader<R>>, |
| header: Vec<u8>, |
| pos: usize, |
| eof: bool, |
| } |
| |
| <span class="kw">pub fn </span>gz_encoder<R: BufRead>(header: Vec<u8>, r: R, lvl: Compression) -> GzEncoder<R> { |
| <span class="kw">let </span>crc = CrcReader::new(r); |
| GzEncoder { |
| inner: deflate::bufread::DeflateEncoder::new(crc, lvl), |
| header, |
| pos: <span class="number">0</span>, |
| eof: <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="kw">impl</span><R: BufRead> 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().buf_read(r, level) |
| } |
| |
| <span class="kw">fn </span>read_footer(<span class="kw-2">&mut </span><span class="self">self</span>, into: <span class="kw-2">&mut </span>[u8]) -> io::Result<usize> { |
| <span class="kw">if </span><span class="self">self</span>.pos == <span class="number">8 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="number">0</span>); |
| } |
| <span class="kw">let </span>crc = <span class="self">self</span>.inner.get_ref().crc(); |
| <span class="kw">let </span><span class="kw-2">ref </span>arr = [ |
| (crc.sum() >> <span class="number">0</span>) <span class="kw">as </span>u8, |
| (crc.sum() >> <span class="number">8</span>) <span class="kw">as </span>u8, |
| (crc.sum() >> <span class="number">16</span>) <span class="kw">as </span>u8, |
| (crc.sum() >> <span class="number">24</span>) <span class="kw">as </span>u8, |
| (crc.amount() >> <span class="number">0</span>) <span class="kw">as </span>u8, |
| (crc.amount() >> <span class="number">8</span>) <span class="kw">as </span>u8, |
| (crc.amount() >> <span class="number">16</span>) <span class="kw">as </span>u8, |
| (crc.amount() >> <span class="number">24</span>) <span class="kw">as </span>u8, |
| ]; |
| <span class="prelude-val">Ok</span>(copy(into, arr, <span class="kw-2">&mut </span><span class="self">self</span>.pos)) |
| } |
| } |
| |
| <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="attribute">#[inline] |
| </span><span class="kw">fn </span>finish(buf: <span class="kw-2">&</span>[u8; <span class="number">8</span>]) -> (u32, u32) { |
| <span class="kw">let </span>crc = ((buf[<span class="number">0</span>] <span class="kw">as </span>u32) << <span class="number">0</span>) |
| | ((buf[<span class="number">1</span>] <span class="kw">as </span>u32) << <span class="number">8</span>) |
| | ((buf[<span class="number">2</span>] <span class="kw">as </span>u32) << <span class="number">16</span>) |
| | ((buf[<span class="number">3</span>] <span class="kw">as </span>u32) << <span class="number">24</span>); |
| <span class="kw">let </span>amt = ((buf[<span class="number">4</span>] <span class="kw">as </span>u32) << <span class="number">0</span>) |
| | ((buf[<span class="number">5</span>] <span class="kw">as </span>u32) << <span class="number">8</span>) |
| | ((buf[<span class="number">6</span>] <span class="kw">as </span>u32) << <span class="number">16</span>) |
| | ((buf[<span class="number">7</span>] <span class="kw">as </span>u32) << <span class="number">24</span>); |
| (crc, amt) |
| } |
| |
| <span class="kw">impl</span><R: BufRead> 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>, <span class="kw-2">mut </span>into: <span class="kw-2">&mut </span>[u8]) -> io::Result<usize> { |
| <span class="kw">let </span><span class="kw-2">mut </span>amt = <span class="number">0</span>; |
| <span class="kw">if </span><span class="self">self</span>.eof { |
| <span class="kw">return </span><span class="self">self</span>.read_footer(into); |
| } <span class="kw">else if </span><span class="self">self</span>.pos < <span class="self">self</span>.header.len() { |
| amt += copy(into, <span class="kw-2">&</span><span class="self">self</span>.header, <span class="kw-2">&mut </span><span class="self">self</span>.pos); |
| <span class="kw">if </span>amt == into.len() { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(amt); |
| } |
| <span class="kw">let </span>tmp = into; |
| into = <span class="kw-2">&mut </span>tmp[amt..]; |
| } |
| <span class="kw">match </span><span class="self">self</span>.inner.read(into)<span class="question-mark">? </span>{ |
| <span class="number">0 </span>=> { |
| <span class="self">self</span>.eof = <span class="bool-val">true</span>; |
| <span class="self">self</span>.pos = <span class="number">0</span>; |
| <span class="self">self</span>.read_footer(into) |
| } |
| n => <span class="prelude-val">Ok</span>(amt + n), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><R: BufRead + 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 consumes a [`BufRead`] interface, reading compressed data |
| /// from the underlying reader, and emitting uncompressed data. |
| /// |
| /// [`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::GzEncoder; |
| /// use flate2::bufread::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 BufRead |
| /// |
| /// 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: GzState, |
| header: <span class="prelude-ty">Option</span><GzHeader>, |
| reader: CrcReader<deflate::bufread::DeflateDecoder<R>>, |
| multi: bool, |
| } |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub enum </span>GzHeaderParsingState { |
| Start, |
| Xlen, |
| Extra, |
| Filename, |
| Comment, |
| Crc, |
| } |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>GzHeaderPartial { |
| buf: Vec<u8>, |
| state: GzHeaderParsingState, |
| flg: u8, |
| xlen: u16, |
| crc: Crc, |
| header: GzHeader, |
| } |
| |
| <span class="kw">impl </span>GzHeaderPartial { |
| <span class="kw">fn </span>new() -> GzHeaderPartial { |
| GzHeaderPartial { |
| buf: Vec::with_capacity(<span class="number">10</span>), <span class="comment">// minimum header length |
| </span>state: GzHeaderParsingState::Start, |
| flg: <span class="number">0</span>, |
| xlen: <span class="number">0</span>, |
| crc: Crc::new(), |
| header: GzHeader { |
| extra: <span class="prelude-val">None</span>, |
| filename: <span class="prelude-val">None</span>, |
| comment: <span class="prelude-val">None</span>, |
| operating_system: <span class="number">0</span>, |
| mtime: <span class="number">0</span>, |
| }, |
| } |
| } |
| |
| <span class="kw">pub fn </span>take_header(<span class="self">self</span>) -> GzHeader { |
| <span class="self">self</span>.header |
| } |
| } |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">enum </span>GzState { |
| Header(GzHeaderPartial), |
| Body, |
| Finished(usize, [u8; <span class="number">8</span>]), |
| <span class="prelude-val">Err</span>(io::Error), |
| End, |
| } |
| |
| <span class="doccomment">/// A small adapter which reads data originally from `buf` and then reads all |
| /// further data from `reader`. This will also buffer all data read from |
| /// `reader` into `buf` for reuse on a further call. |
| </span><span class="kw">struct </span>Buffer<<span class="lifetime">'a</span>, T: <span class="lifetime">'a</span>> { |
| part: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>GzHeaderPartial, |
| buf_cur: usize, |
| buf_max: usize, |
| reader: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> Buffer<<span class="lifetime">'a</span>, T> { |
| <span class="kw">fn </span>new(part: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>GzHeaderPartial, reader: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T) -> Buffer<<span class="lifetime">'a</span>, T> { |
| Buffer { |
| reader, |
| buf_cur: <span class="number">0</span>, |
| buf_max: part.buf.len(), |
| part, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T: Read> Read <span class="kw">for </span>Buffer<<span class="lifetime">'a</span>, T> { |
| <span class="kw">fn </span>read(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>[u8]) -> io::Result<usize> { |
| <span class="kw">let </span><span class="kw-2">mut </span>bufref = <span class="kw">match </span><span class="self">self</span>.part.state { |
| GzHeaderParsingState::Filename => <span class="self">self</span>.part.header.filename.as_mut(), |
| GzHeaderParsingState::Comment => <span class="self">self</span>.part.header.comment.as_mut(), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| }; |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref mut </span>b) = bufref { |
| <span class="comment">// we have a direct reference to a buffer where to write |
| </span><span class="kw">let </span>len = <span class="self">self</span>.reader.read(buf)<span class="question-mark">?</span>; |
| <span class="kw">if </span>len > <span class="number">0 </span>&& buf[len - <span class="number">1</span>] == <span class="number">0 </span>{ |
| <span class="comment">// we do not append the final 0 |
| </span>b.extend_from_slice(<span class="kw-2">&</span>buf[..len - <span class="number">1</span>]); |
| } <span class="kw">else </span>{ |
| b.extend_from_slice(<span class="kw-2">&</span>buf[..len]); |
| } |
| <span class="self">self</span>.part.crc.update(<span class="kw-2">&</span>buf[..len]); |
| <span class="prelude-val">Ok</span>(len) |
| } <span class="kw">else if </span><span class="self">self</span>.buf_cur == <span class="self">self</span>.buf_max { |
| <span class="comment">// we read new bytes and also save them in self.part.buf |
| </span><span class="kw">let </span>len = <span class="self">self</span>.reader.read(buf)<span class="question-mark">?</span>; |
| <span class="self">self</span>.part.buf.extend_from_slice(<span class="kw-2">&</span>buf[..len]); |
| <span class="self">self</span>.part.crc.update(<span class="kw-2">&</span>buf[..len]); |
| <span class="prelude-val">Ok</span>(len) |
| } <span class="kw">else </span>{ |
| <span class="comment">// we first read the previously saved bytes |
| </span><span class="kw">let </span>len = (<span class="kw-2">&</span><span class="self">self</span>.part.buf[<span class="self">self</span>.buf_cur..<span class="self">self</span>.buf_max]).read(buf)<span class="question-mark">?</span>; |
| <span class="self">self</span>.buf_cur += len; |
| <span class="prelude-val">Ok</span>(len) |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> Buffer<<span class="lifetime">'a</span>, T> |
| <span class="kw">where |
| </span>T: std::io::Read, |
| { |
| <span class="comment">// If we manage to read all the bytes, we reset the buffer |
| </span><span class="kw">fn </span>read_and_forget(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>[u8]) -> io::Result<usize> { |
| <span class="self">self</span>.read_exact(buf)<span class="question-mark">?</span>; |
| <span class="comment">// we managed to read the whole buf |
| // we will no longer need the previously saved bytes in self.part.buf |
| </span><span class="kw">let </span>rlen = buf.len(); |
| <span class="self">self</span>.part.buf.truncate(<span class="number">0</span>); |
| <span class="self">self</span>.buf_cur = <span class="number">0</span>; |
| <span class="self">self</span>.buf_max = <span class="number">0</span>; |
| <span class="prelude-val">Ok</span>(rlen) |
| } |
| } |
| |
| <span class="kw">impl</span><R: BufRead> 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(<span class="kw-2">mut </span>r: R) -> GzDecoder<R> { |
| <span class="kw">let </span><span class="kw-2">mut </span>part = GzHeaderPartial::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>header = <span class="prelude-val">None</span>; |
| |
| <span class="kw">let </span>result = { |
| <span class="kw">let </span><span class="kw-2">mut </span>reader = Buffer::new(<span class="kw-2">&mut </span>part, <span class="kw-2">&mut </span>r); |
| read_gz_header_part(<span class="kw-2">&mut </span>reader) |
| }; |
| |
| <span class="kw">let </span>state = <span class="kw">match </span>result { |
| <span class="prelude-val">Ok</span>(()) => { |
| header = <span class="prelude-val">Some</span>(part.take_header()); |
| GzState::Body |
| } |
| <span class="prelude-val">Err</span>(<span class="kw-2">ref </span>err) <span class="kw">if </span>io::ErrorKind::WouldBlock == err.kind() => GzState::Header(part), |
| <span class="prelude-val">Err</span>(err) => GzState::Err(err), |
| }; |
| |
| GzDecoder { |
| inner: state, |
| reader: CrcReader::new(deflate::bufread::DeflateDecoder::new(r)), |
| multi: <span class="bool-val">false</span>, |
| header, |
| } |
| } |
| |
| <span class="kw">fn </span>multi(<span class="kw-2">mut </span><span class="self">self</span>, flag: bool) -> GzDecoder<R> { |
| <span class="self">self</span>.multi = flag; |
| <span class="self">self |
| </span>} |
| } |
| |
| <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>.header.as_ref() |
| } |
| |
| <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>.reader.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>.reader.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>.reader.into_inner().into_inner() |
| } |
| } |
| |
| <span class="kw">impl</span><R: BufRead> 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="kw">let </span>GzDecoder { |
| inner, |
| header, |
| reader, |
| multi, |
| } = <span class="self">self</span>; |
| |
| <span class="kw">loop </span>{ |
| <span class="kw-2">*</span>inner = <span class="kw">match </span>mem::replace(inner, GzState::End) { |
| GzState::Header(<span class="kw-2">mut </span>part) => { |
| <span class="kw">let </span>result = { |
| <span class="kw">let </span><span class="kw-2">mut </span>reader = Buffer::new(<span class="kw-2">&mut </span>part, reader.get_mut().get_mut()); |
| read_gz_header_part(<span class="kw-2">&mut </span>reader) |
| }; |
| <span class="kw">match </span>result { |
| <span class="prelude-val">Ok</span>(()) => { |
| <span class="kw-2">*</span>header = <span class="prelude-val">Some</span>(part.take_header()); |
| GzState::Body |
| } |
| <span class="prelude-val">Err</span>(err) <span class="kw">if </span>io::ErrorKind::WouldBlock == err.kind() => { |
| <span class="kw-2">*</span>inner = GzState::Header(part); |
| <span class="kw">return </span><span class="prelude-val">Err</span>(err); |
| } |
| <span class="prelude-val">Err</span>(err) => <span class="kw">return </span><span class="prelude-val">Err</span>(err), |
| } |
| } |
| GzState::Body => { |
| <span class="kw">if </span>into.is_empty() { |
| <span class="kw-2">*</span>inner = GzState::Body; |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="number">0</span>); |
| } |
| |
| <span class="kw">let </span>n = reader.read(into).map_err(|err| { |
| <span class="kw">if </span>io::ErrorKind::WouldBlock == err.kind() { |
| <span class="kw-2">*</span>inner = GzState::Body; |
| } |
| |
| err |
| })<span class="question-mark">?</span>; |
| |
| <span class="kw">match </span>n { |
| <span class="number">0 </span>=> GzState::Finished(<span class="number">0</span>, [<span class="number">0</span>; <span class="number">8</span>]), |
| n => { |
| <span class="kw-2">*</span>inner = GzState::Body; |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(n); |
| } |
| } |
| } |
| GzState::Finished(pos, <span class="kw-2">mut </span>buf) => { |
| <span class="kw">if </span>pos < buf.len() { |
| <span class="kw">let </span>n = reader |
| .get_mut() |
| .get_mut() |
| .read(<span class="kw-2">&mut </span>buf[pos..]) |
| .and_then(|n| { |
| <span class="kw">if </span>n == <span class="number">0 </span>{ |
| <span class="prelude-val">Err</span>(io::ErrorKind::UnexpectedEof.into()) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Ok</span>(n) |
| } |
| }) |
| .map_err(|err| { |
| <span class="kw">if </span>io::ErrorKind::WouldBlock == err.kind() { |
| <span class="kw-2">*</span>inner = GzState::Finished(pos, buf); |
| } |
| |
| err |
| })<span class="question-mark">?</span>; |
| |
| GzState::Finished(pos + n, buf) |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>(crc, amt) = finish(<span class="kw-2">&</span>buf); |
| |
| <span class="kw">if </span>crc != reader.crc().sum() || amt != reader.crc().amount() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(corrupt()); |
| } <span class="kw">else if </span><span class="kw-2">*</span>multi { |
| <span class="kw">let </span>is_eof = reader |
| .get_mut() |
| .get_mut() |
| .fill_buf() |
| .map(|buf| buf.is_empty()) |
| .map_err(|err| { |
| <span class="kw">if </span>io::ErrorKind::WouldBlock == err.kind() { |
| <span class="kw-2">*</span>inner = GzState::Finished(pos, buf); |
| } |
| |
| err |
| })<span class="question-mark">?</span>; |
| |
| <span class="kw">if </span>is_eof { |
| GzState::End |
| } <span class="kw">else </span>{ |
| reader.reset(); |
| reader.get_mut().reset_data(); |
| header.take(); |
| GzState::Header(GzHeaderPartial::new()) |
| } |
| } <span class="kw">else </span>{ |
| GzState::End |
| } |
| } |
| } |
| GzState::Err(err) => <span class="kw">return </span><span class="prelude-val">Err</span>(err), |
| GzState::End => <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="number">0</span>), |
| }; |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><R: BufRead + 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 [`BufRead`] interface that will consume all gzip members |
| /// from the underlying reader and emit uncompressed data. |
| /// |
| /// [`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::GzEncoder; |
| /// use flate2::bufread::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 BufRead |
| /// |
| /// 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>(GzDecoder<R>); |
| |
| <span class="kw">impl</span><R: BufRead> 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(GzDecoder::new(r).multi(<span class="bool-val">true</span>)) |
| } |
| } |
| |
| <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>.<span class="number">0</span>.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>.<span class="number">0</span>.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>.<span class="number">0</span>.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>.<span class="number">0</span>.into_inner() |
| } |
| } |
| |
| <span class="kw">impl</span><R: BufRead> 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>.<span class="number">0</span>.read(into) |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">pub mod </span>tests { |
| <span class="kw">use </span><span class="kw">crate</span>::gz::bufread::<span class="kw-2">*</span>; |
| <span class="kw">use </span>std::io; |
| <span class="kw">use </span>std::io::{Cursor, Read, Write}; |
| |
| <span class="comment">//a cursor turning EOF into blocking errors |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>BlockingCursor { |
| <span class="kw">pub </span>cursor: Cursor<Vec<u8>>, |
| } |
| |
| <span class="kw">impl </span>BlockingCursor { |
| <span class="kw">pub fn </span>new() -> BlockingCursor { |
| BlockingCursor { |
| cursor: Cursor::new(Vec::new()), |
| } |
| } |
| |
| <span class="kw">pub fn </span>set_position(<span class="kw-2">&mut </span><span class="self">self</span>, pos: u64) { |
| <span class="self">self</span>.cursor.set_position(pos) |
| } |
| |
| <span class="kw">pub fn </span>position(<span class="kw-2">&mut </span><span class="self">self</span>) -> u64 { |
| <span class="self">self</span>.cursor.position() |
| } |
| } |
| |
| <span class="kw">impl </span>Write <span class="kw">for </span>BlockingCursor { |
| <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>.cursor.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>.cursor.flush() |
| } |
| } |
| |
| <span class="kw">impl </span>Read <span class="kw">for </span>BlockingCursor { |
| <span class="kw">fn </span>read(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>[u8]) -> io::Result<usize> { |
| <span class="comment">//use the cursor, except it turns eof into blocking error |
| </span><span class="kw">let </span>r = <span class="self">self</span>.cursor.read(buf); |
| <span class="kw">match </span>r { |
| <span class="prelude-val">Err</span>(<span class="kw-2">ref </span>err) => { |
| <span class="kw">if </span>err.kind() == io::ErrorKind::UnexpectedEof { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(io::ErrorKind::WouldBlock.into()); |
| } |
| } |
| <span class="prelude-val">Ok</span>(<span class="number">0</span>) => { |
| <span class="comment">//regular EOF turned into blocking error |
| </span><span class="kw">return </span><span class="prelude-val">Err</span>(io::ErrorKind::WouldBlock.into()); |
| } |
| <span class="prelude-val">Ok</span>(_n) => {} |
| } |
| r |
| } |
| } |
| <span class="attribute">#[test] |
| </span><span class="comment">// test function read_and_forget of Buffer |
| </span><span class="kw">fn </span>buffer_read_and_forget() { |
| <span class="comment">// this is unused except for the buffering |
| </span><span class="kw">let </span><span class="kw-2">mut </span>part = GzHeaderPartial::new(); |
| <span class="comment">// this is a reader which receives data afterwards |
| </span><span class="kw">let </span><span class="kw-2">mut </span>r = BlockingCursor::new(); |
| <span class="kw">let </span>data = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]; |
| <span class="kw">let </span><span class="kw-2">mut </span>out = Vec::with_capacity(<span class="number">7</span>); |
| |
| <span class="kw">match </span>r.write_all(<span class="kw-2">&</span>data) { |
| <span class="prelude-val">Ok</span>(()) => {} |
| <span class="kw">_ </span>=> { |
| <span class="macro">panic!</span>(<span class="string">"Unexpected result for write_all"</span>); |
| } |
| } |
| r.set_position(<span class="number">0</span>); |
| |
| <span class="comment">// First read : successful for one byte |
| </span><span class="kw">let </span><span class="kw-2">mut </span>reader = Buffer::new(<span class="kw-2">&mut </span>part, <span class="kw-2">&mut </span>r); |
| out.resize(<span class="number">1</span>, <span class="number">0</span>); |
| <span class="kw">match </span>reader.read_and_forget(<span class="kw-2">&mut </span>out) { |
| <span class="prelude-val">Ok</span>(<span class="number">1</span>) => {} |
| <span class="kw">_ </span>=> { |
| <span class="macro">panic!</span>(<span class="string">"Unexpected result for read_and_forget with data"</span>); |
| } |
| } |
| |
| <span class="comment">// Second read : incomplete for 7 bytes (we have only 2) |
| </span>out.resize(<span class="number">7</span>, <span class="number">0</span>); |
| <span class="kw">match </span>reader.read_and_forget(<span class="kw-2">&mut </span>out) { |
| <span class="prelude-val">Err</span>(<span class="kw-2">ref </span>err) => { |
| <span class="macro">assert_eq!</span>(io::ErrorKind::WouldBlock, err.kind()); |
| } |
| <span class="kw">_ </span>=> { |
| <span class="macro">panic!</span>(<span class="string">"Unexpected result for read_and_forget with incomplete"</span>); |
| } |
| } |
| |
| <span class="comment">// 3 more data bytes have arrived |
| </span><span class="kw">let </span>pos = r.position(); |
| <span class="kw">let </span>data2 = <span class="macro">vec!</span>[<span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]; |
| <span class="kw">match </span>r.write_all(<span class="kw-2">&</span>data2) { |
| <span class="prelude-val">Ok</span>(()) => {} |
| <span class="kw">_ </span>=> { |
| <span class="macro">panic!</span>(<span class="string">"Unexpected result for write_all"</span>); |
| } |
| } |
| r.set_position(pos); |
| |
| <span class="comment">// Third read : still incomplete for 7 bytes (we have 5) |
| </span><span class="kw">let </span><span class="kw-2">mut </span>reader2 = Buffer::new(<span class="kw-2">&mut </span>part, <span class="kw-2">&mut </span>r); |
| <span class="kw">match </span>reader2.read_and_forget(<span class="kw-2">&mut </span>out) { |
| <span class="prelude-val">Err</span>(<span class="kw-2">ref </span>err) => { |
| <span class="macro">assert_eq!</span>(io::ErrorKind::WouldBlock, err.kind()); |
| } |
| <span class="kw">_ </span>=> { |
| <span class="macro">panic!</span>(<span class="string">"Unexpected result for read_and_forget with more incomplete"</span>); |
| } |
| } |
| |
| <span class="comment">// 3 more data bytes have arrived again |
| </span><span class="kw">let </span>pos2 = r.position(); |
| <span class="kw">let </span>data3 = <span class="macro">vec!</span>[<span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>]; |
| <span class="kw">match </span>r.write_all(<span class="kw-2">&</span>data3) { |
| <span class="prelude-val">Ok</span>(()) => {} |
| <span class="kw">_ </span>=> { |
| <span class="macro">panic!</span>(<span class="string">"Unexpected result for write_all"</span>); |
| } |
| } |
| r.set_position(pos2); |
| |
| <span class="comment">// Fourth read : now successful for 7 bytes |
| </span><span class="kw">let </span><span class="kw-2">mut </span>reader3 = Buffer::new(<span class="kw-2">&mut </span>part, <span class="kw-2">&mut </span>r); |
| <span class="kw">match </span>reader3.read_and_forget(<span class="kw-2">&mut </span>out) { |
| <span class="prelude-val">Ok</span>(<span class="number">7</span>) => { |
| <span class="macro">assert_eq!</span>(out[<span class="number">0</span>], <span class="number">2</span>); |
| <span class="macro">assert_eq!</span>(out[<span class="number">6</span>], <span class="number">8</span>); |
| } |
| <span class="kw">_ </span>=> { |
| <span class="macro">panic!</span>(<span class="string">"Unexpected result for read_and_forget with data"</span>); |
| } |
| } |
| |
| <span class="comment">// Fifth read : successful for one more byte |
| </span>out.resize(<span class="number">1</span>, <span class="number">0</span>); |
| <span class="kw">match </span>reader3.read_and_forget(<span class="kw-2">&mut </span>out) { |
| <span class="prelude-val">Ok</span>(<span class="number">1</span>) => { |
| <span class="macro">assert_eq!</span>(out[<span class="number">0</span>], <span class="number">9</span>); |
| } |
| <span class="kw">_ </span>=> { |
| <span class="macro">panic!</span>(<span class="string">"Unexpected result for read_and_forget with data"</span>); |
| } |
| } |
| } |
| } |
| </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> |
