| <!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/write.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>write.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="523">523</span> |
| <span id="524">524</span> |
| <span id="525">525</span> |
| <span id="526">526</span> |
| <span id="527">527</span> |
| <span id="528">528</span> |
| <span id="529">529</span> |
| <span id="530">530</span> |
| <span id="531">531</span> |
| <span id="532">532</span> |
| <span id="533">533</span> |
| <span id="534">534</span> |
| <span id="535">535</span> |
| <span id="536">536</span> |
| <span id="537">537</span> |
| <span id="538">538</span> |
| <span id="539">539</span> |
| <span id="540">540</span> |
| <span id="541">541</span> |
| <span id="542">542</span> |
| <span id="543">543</span> |
| <span id="544">544</span> |
| <span id="545">545</span> |
| <span id="546">546</span> |
| <span id="547">547</span> |
| <span id="548">548</span> |
| <span id="549">549</span> |
| <span id="550">550</span> |
| <span id="551">551</span> |
| <span id="552">552</span> |
| <span id="553">553</span> |
| <span id="554">554</span> |
| <span id="555">555</span> |
| <span id="556">556</span> |
| <span id="557">557</span> |
| <span id="558">558</span> |
| <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> |
| </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><span class="kw">super</span>::bufread::{corrupt, read_gz_header}; |
| <span class="kw">use super</span>::{GzBuilder, GzHeader}; |
| <span class="kw">use </span><span class="kw">crate</span>::crc::{Crc, CrcWriter}; |
| <span class="kw">use </span><span class="kw">crate</span>::zio; |
| <span class="kw">use crate</span>::{Compress, Compression, Decompress, Status}; |
| |
| <span class="doccomment">/// A gzip streaming encoder |
| /// |
| /// This structure exposes a [`Write`] interface that will emit compressed data |
| /// to the underlying writer `W`. |
| /// |
| /// [`Write`]: https://doc.rust-lang.org/std/io/trait.Write.html |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use std::io::prelude::*; |
| /// use flate2::Compression; |
| /// use flate2::write::GzEncoder; |
| /// |
| /// // Vec<u8> implements Write to print the compressed bytes of sample string |
| /// # fn main() { |
| /// |
| /// let mut e = GzEncoder::new(Vec::new(), Compression::default()); |
| /// e.write_all(b"Hello World").unwrap(); |
| /// println!("{:?}", e.finish().unwrap()); |
| /// # } |
| /// ``` |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>GzEncoder<W: Write> { |
| inner: zio::Writer<W, Compress>, |
| crc: Crc, |
| crc_bytes_written: usize, |
| header: Vec<u8>, |
| } |
| |
| <span class="kw">pub fn </span>gz_encoder<W: Write>(header: Vec<u8>, w: W, lvl: Compression) -> GzEncoder<W> { |
| GzEncoder { |
| inner: zio::Writer::new(w, Compress::new(lvl, <span class="bool-val">false</span>)), |
| crc: Crc::new(), |
| header, |
| crc_bytes_written: <span class="number">0</span>, |
| } |
| } |
| |
| <span class="kw">impl</span><W: Write> GzEncoder<W> { |
| <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 written to the returned encoder will be compressed and then |
| /// written to the stream `w`. |
| </span><span class="kw">pub fn </span>new(w: W, level: Compression) -> GzEncoder<W> { |
| GzBuilder::new().write(w, level) |
| } |
| |
| <span class="doccomment">/// Acquires a reference to the underlying writer. |
| </span><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>.inner.get_ref() |
| } |
| |
| <span class="doccomment">/// Acquires a mutable reference to the underlying writer. |
| /// |
| /// Note that mutation of the writer 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>W { |
| <span class="self">self</span>.inner.get_mut() |
| } |
| |
| <span class="doccomment">/// Attempt to finish this output stream, writing out final chunks of data. |
| /// |
| /// Note that this function can only be used once data has finished being |
| /// written to the output stream. After this function is called then further |
| /// calls to `write` may result in a panic. |
| /// |
| /// # Panics |
| /// |
| /// Attempts to write data to this stream may result in a panic after this |
| /// function is called. |
| /// |
| /// # Errors |
| /// |
| /// This function will perform I/O to complete this stream, and any I/O |
| /// errors which occur will be returned from this function. |
| </span><span class="kw">pub fn </span>try_finish(<span class="kw-2">&mut </span><span class="self">self</span>) -> io::Result<()> { |
| <span class="self">self</span>.write_header()<span class="question-mark">?</span>; |
| <span class="self">self</span>.inner.finish()<span class="question-mark">?</span>; |
| |
| <span class="kw">while </span><span class="self">self</span>.crc_bytes_written < <span class="number">8 </span>{ |
| <span class="kw">let </span>(sum, amt) = (<span class="self">self</span>.crc.sum(), <span class="self">self</span>.crc.amount()); |
| <span class="kw">let </span>buf = [ |
| (sum >> <span class="number">0</span>) <span class="kw">as </span>u8, |
| (sum >> <span class="number">8</span>) <span class="kw">as </span>u8, |
| (sum >> <span class="number">16</span>) <span class="kw">as </span>u8, |
| (sum >> <span class="number">24</span>) <span class="kw">as </span>u8, |
| (amt >> <span class="number">0</span>) <span class="kw">as </span>u8, |
| (amt >> <span class="number">8</span>) <span class="kw">as </span>u8, |
| (amt >> <span class="number">16</span>) <span class="kw">as </span>u8, |
| (amt >> <span class="number">24</span>) <span class="kw">as </span>u8, |
| ]; |
| <span class="kw">let </span>inner = <span class="self">self</span>.inner.get_mut(); |
| <span class="kw">let </span>n = inner.write(<span class="kw-2">&</span>buf[<span class="self">self</span>.crc_bytes_written..])<span class="question-mark">?</span>; |
| <span class="self">self</span>.crc_bytes_written += n; |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="doccomment">/// Finish encoding this stream, returning the underlying writer once the |
| /// encoding is done. |
| /// |
| /// Note that this function may not be suitable to call in a situation where |
| /// the underlying stream is an asynchronous I/O stream. To finish a stream |
| /// the `try_finish` (or `shutdown`) method should be used instead. To |
| /// re-acquire ownership of a stream it is safe to call this method after |
| /// `try_finish` or `shutdown` has returned `Ok`. |
| /// |
| /// # Errors |
| /// |
| /// This function will perform I/O to complete this stream, and any I/O |
| /// errors which occur will be returned from this function. |
| </span><span class="kw">pub fn </span>finish(<span class="kw-2">mut </span><span class="self">self</span>) -> io::Result<W> { |
| <span class="self">self</span>.try_finish()<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(<span class="self">self</span>.inner.take_inner()) |
| } |
| |
| <span class="kw">fn </span>write_header(<span class="kw-2">&mut </span><span class="self">self</span>) -> io::Result<()> { |
| <span class="kw">while </span>!<span class="self">self</span>.header.is_empty() { |
| <span class="kw">let </span>n = <span class="self">self</span>.inner.get_mut().write(<span class="kw-2">&</span><span class="self">self</span>.header)<span class="question-mark">?</span>; |
| <span class="self">self</span>.header.drain(..n); |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">impl</span><W: Write> Write <span class="kw">for </span>GzEncoder<W> { |
| <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="macro">assert_eq!</span>(<span class="self">self</span>.crc_bytes_written, <span class="number">0</span>); |
| <span class="self">self</span>.write_header()<span class="question-mark">?</span>; |
| <span class="kw">let </span>n = <span class="self">self</span>.inner.write(buf)<span class="question-mark">?</span>; |
| <span class="self">self</span>.crc.update(<span class="kw-2">&</span>buf[..n]); |
| <span class="prelude-val">Ok</span>(n) |
| } |
| |
| <span class="kw">fn </span>flush(<span class="kw-2">&mut </span><span class="self">self</span>) -> io::Result<()> { |
| <span class="macro">assert_eq!</span>(<span class="self">self</span>.crc_bytes_written, <span class="number">0</span>); |
| <span class="self">self</span>.write_header()<span class="question-mark">?</span>; |
| <span class="self">self</span>.inner.flush() |
| } |
| } |
| |
| <span class="kw">impl</span><R: Read + Write> 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>, buf: <span class="kw-2">&mut </span>[u8]) -> io::Result<usize> { |
| <span class="self">self</span>.get_mut().read(buf) |
| } |
| } |
| |
| <span class="kw">impl</span><W: Write> Drop <span class="kw">for </span>GzEncoder<W> { |
| <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>.inner.is_present() { |
| <span class="kw">let _ </span>= <span class="self">self</span>.try_finish(); |
| } |
| } |
| } |
| |
| <span class="doccomment">/// A gzip streaming decoder |
| /// |
| /// This structure exposes a [`Write`] interface that will emit uncompressed data |
| /// to the underlying writer `W`. |
| /// |
| /// [`Write`]: https://doc.rust-lang.org/std/io/trait.Write.html |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use std::io::prelude::*; |
| /// use std::io; |
| /// use flate2::Compression; |
| /// use flate2::write::{GzEncoder, GzDecoder}; |
| /// |
| /// # fn main() { |
| /// # let mut e = GzEncoder::new(Vec::new(), Compression::default()); |
| /// # e.write(b"Hello World").unwrap(); |
| /// # let bytes = e.finish().unwrap(); |
| /// # assert_eq!("Hello World", decode_writer(bytes).unwrap()); |
| /// # } |
| /// // Uncompresses a gzip encoded vector of bytes and returns a string or error |
| /// // Here Vec<u8> implements Write |
| /// fn decode_writer(bytes: Vec<u8>) -> io::Result<String> { |
| /// let mut writer = Vec::new(); |
| /// let mut decoder = GzDecoder::new(writer); |
| /// decoder.write_all(&bytes[..])?; |
| /// writer = decoder.finish()?; |
| /// let return_string = String::from_utf8(writer).expect("String parsing error"); |
| /// Ok(return_string) |
| /// } |
| /// ``` |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>GzDecoder<W: Write> { |
| inner: zio::Writer<CrcWriter<W>, Decompress>, |
| crc_bytes: Vec<u8>, |
| header: <span class="prelude-ty">Option</span><GzHeader>, |
| header_buf: Vec<u8>, |
| } |
| |
| <span class="kw">const </span>CRC_BYTES_LEN: usize = <span class="number">8</span>; |
| |
| <span class="kw">impl</span><W: Write> GzDecoder<W> { |
| <span class="doccomment">/// Creates a new decoder which will write uncompressed data to the stream. |
| /// |
| /// When this encoder is dropped or unwrapped the final pieces of data will |
| /// be flushed. |
| </span><span class="kw">pub fn </span>new(w: W) -> GzDecoder<W> { |
| GzDecoder { |
| inner: zio::Writer::new(CrcWriter::new(w), Decompress::new(<span class="bool-val">false</span>)), |
| crc_bytes: Vec::with_capacity(CRC_BYTES_LEN), |
| header: <span class="prelude-val">None</span>, |
| header_buf: Vec::new(), |
| } |
| } |
| |
| <span class="doccomment">/// Returns the header associated with this stream. |
| </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 writer. |
| </span><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>.inner.get_ref().get_ref() |
| } |
| |
| <span class="doccomment">/// Acquires a mutable reference to the underlying writer. |
| /// |
| /// Note that mutating the output/input state of the stream may corrupt this |
| /// object, so care must be taken when using this method. |
| </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>W { |
| <span class="self">self</span>.inner.get_mut().get_mut() |
| } |
| |
| <span class="doccomment">/// Attempt to finish this output stream, writing out final chunks of data. |
| /// |
| /// Note that this function can only be used once data has finished being |
| /// written to the output stream. After this function is called then further |
| /// calls to `write` may result in a panic. |
| /// |
| /// # Panics |
| /// |
| /// Attempts to write data to this stream may result in a panic after this |
| /// function is called. |
| /// |
| /// # Errors |
| /// |
| /// This function will perform I/O to finish the stream, returning any |
| /// errors which happen. |
| </span><span class="kw">pub fn </span>try_finish(<span class="kw-2">&mut </span><span class="self">self</span>) -> io::Result<()> { |
| <span class="self">self</span>.finish_and_check_crc()<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="doccomment">/// Consumes this decoder, flushing the output stream. |
| /// |
| /// This will flush the underlying data stream and then return the contained |
| /// writer if the flush succeeded. |
| /// |
| /// Note that this function may not be suitable to call in a situation where |
| /// the underlying stream is an asynchronous I/O stream. To finish a stream |
| /// the `try_finish` (or `shutdown`) method should be used instead. To |
| /// re-acquire ownership of a stream it is safe to call this method after |
| /// `try_finish` or `shutdown` has returned `Ok`. |
| /// |
| /// # Errors |
| /// |
| /// This function will perform I/O to complete this stream, and any I/O |
| /// errors which occur will be returned from this function. |
| </span><span class="kw">pub fn </span>finish(<span class="kw-2">mut </span><span class="self">self</span>) -> io::Result<W> { |
| <span class="self">self</span>.finish_and_check_crc()<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(<span class="self">self</span>.inner.take_inner().into_inner()) |
| } |
| |
| <span class="kw">fn </span>finish_and_check_crc(<span class="kw-2">&mut </span><span class="self">self</span>) -> io::Result<()> { |
| <span class="self">self</span>.inner.finish()<span class="question-mark">?</span>; |
| |
| <span class="kw">if </span><span class="self">self</span>.crc_bytes.len() != <span class="number">8 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(corrupt()); |
| } |
| |
| <span class="kw">let </span>crc = ((<span class="self">self</span>.crc_bytes[<span class="number">0</span>] <span class="kw">as </span>u32) << <span class="number">0</span>) |
| | ((<span class="self">self</span>.crc_bytes[<span class="number">1</span>] <span class="kw">as </span>u32) << <span class="number">8</span>) |
| | ((<span class="self">self</span>.crc_bytes[<span class="number">2</span>] <span class="kw">as </span>u32) << <span class="number">16</span>) |
| | ((<span class="self">self</span>.crc_bytes[<span class="number">3</span>] <span class="kw">as </span>u32) << <span class="number">24</span>); |
| <span class="kw">let </span>amt = ((<span class="self">self</span>.crc_bytes[<span class="number">4</span>] <span class="kw">as </span>u32) << <span class="number">0</span>) |
| | ((<span class="self">self</span>.crc_bytes[<span class="number">5</span>] <span class="kw">as </span>u32) << <span class="number">8</span>) |
| | ((<span class="self">self</span>.crc_bytes[<span class="number">6</span>] <span class="kw">as </span>u32) << <span class="number">16</span>) |
| | ((<span class="self">self</span>.crc_bytes[<span class="number">7</span>] <span class="kw">as </span>u32) << <span class="number">24</span>); |
| <span class="kw">if </span>crc != <span class="self">self</span>.inner.get_ref().crc().sum() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(corrupt()); |
| } |
| <span class="kw">if </span>amt != <span class="self">self</span>.inner.get_ref().crc().amount() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(corrupt()); |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">struct </span>Counter<T: Read> { |
| inner: T, |
| pos: usize, |
| } |
| |
| <span class="kw">impl</span><T: Read> Read <span class="kw">for </span>Counter<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>pos = <span class="self">self</span>.inner.read(buf)<span class="question-mark">?</span>; |
| <span class="self">self</span>.pos += pos; |
| <span class="prelude-val">Ok</span>(pos) |
| } |
| } |
| |
| <span class="kw">impl</span><W: Write> Write <span class="kw">for </span>GzDecoder<W> { |
| <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="kw">if </span><span class="self">self</span>.header.is_none() { |
| <span class="comment">// trying to avoid buffer usage |
| </span><span class="kw">let </span>(res, pos) = { |
| <span class="kw">let </span><span class="kw-2">mut </span>counter = Counter { |
| inner: <span class="self">self</span>.header_buf.chain(buf), |
| pos: <span class="number">0</span>, |
| }; |
| <span class="kw">let </span>res = read_gz_header(<span class="kw-2">&mut </span>counter); |
| (res, counter.pos) |
| }; |
| |
| <span class="kw">match </span>res { |
| <span class="prelude-val">Err</span>(err) => { |
| <span class="kw">if </span>err.kind() == io::ErrorKind::UnexpectedEof { |
| <span class="comment">// not enough data for header, save to the buffer |
| </span><span class="self">self</span>.header_buf.extend(buf); |
| <span class="prelude-val">Ok</span>(buf.len()) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(err) |
| } |
| } |
| <span class="prelude-val">Ok</span>(header) => { |
| <span class="self">self</span>.header = <span class="prelude-val">Some</span>(header); |
| <span class="kw">let </span>pos = pos - <span class="self">self</span>.header_buf.len(); |
| <span class="self">self</span>.header_buf.truncate(<span class="number">0</span>); |
| <span class="prelude-val">Ok</span>(pos) |
| } |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>(n, status) = <span class="self">self</span>.inner.write_with_status(buf)<span class="question-mark">?</span>; |
| |
| <span class="kw">if </span>status == Status::StreamEnd && n < buf.len() && <span class="self">self</span>.crc_bytes.len() < <span class="number">8 </span>{ |
| <span class="kw">let </span>remaining = buf.len() - n; |
| <span class="kw">let </span>crc_bytes = cmp::min(remaining, CRC_BYTES_LEN - <span class="self">self</span>.crc_bytes.len()); |
| <span class="self">self</span>.crc_bytes.extend(<span class="kw-2">&</span>buf[n..n + crc_bytes]); |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(n + crc_bytes); |
| } |
| <span class="prelude-val">Ok</span>(n) |
| } |
| } |
| |
| <span class="kw">fn </span>flush(<span class="kw-2">&mut </span><span class="self">self</span>) -> io::Result<()> { |
| <span class="self">self</span>.inner.flush() |
| } |
| } |
| |
| <span class="kw">impl</span><W: Read + Write> Read <span class="kw">for </span>GzDecoder<W> { |
| <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="self">self</span>.inner.get_mut().get_mut().read(buf) |
| } |
| } |
| |
| <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 [`Write`] interface that will consume all gzip members |
| /// from the written buffers and write uncompressed data to the writer. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>MultiGzDecoder<W: Write> { |
| inner: GzDecoder<W>, |
| } |
| |
| <span class="kw">impl</span><W: Write> MultiGzDecoder<W> { |
| <span class="doccomment">/// Creates a new decoder which will write uncompressed data to the stream. |
| /// If the gzip stream contains multiple members all will be decoded. |
| </span><span class="kw">pub fn </span>new(w: W) -> MultiGzDecoder<W> { |
| MultiGzDecoder { |
| inner: GzDecoder::new(w), |
| } |
| } |
| |
| <span class="doccomment">/// Returns the header associated with the current member. |
| </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 writer. |
| </span><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>.inner.get_ref() |
| } |
| |
| <span class="doccomment">/// Acquires a mutable reference to the underlying writer. |
| /// |
| /// Note that mutating the output/input state of the stream may corrupt this |
| /// object, so care must be taken when using this method. |
| </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>W { |
| <span class="self">self</span>.inner.get_mut() |
| } |
| |
| <span class="doccomment">/// Attempt to finish this output stream, writing out final chunks of data. |
| /// |
| /// Note that this function can only be used once data has finished being |
| /// written to the output stream. After this function is called then further |
| /// calls to `write` may result in a panic. |
| /// |
| /// # Panics |
| /// |
| /// Attempts to write data to this stream may result in a panic after this |
| /// function is called. |
| /// |
| /// # Errors |
| /// |
| /// This function will perform I/O to finish the stream, returning any |
| /// errors which happen. |
| </span><span class="kw">pub fn </span>try_finish(<span class="kw-2">&mut </span><span class="self">self</span>) -> io::Result<()> { |
| <span class="self">self</span>.inner.try_finish() |
| } |
| |
| <span class="doccomment">/// Consumes this decoder, flushing the output stream. |
| /// |
| /// This will flush the underlying data stream and then return the contained |
| /// writer if the flush succeeded. |
| /// |
| /// Note that this function may not be suitable to call in a situation where |
| /// the underlying stream is an asynchronous I/O stream. To finish a stream |
| /// the `try_finish` (or `shutdown`) method should be used instead. To |
| /// re-acquire ownership of a stream it is safe to call this method after |
| /// `try_finish` or `shutdown` has returned `Ok`. |
| /// |
| /// # Errors |
| /// |
| /// This function will perform I/O to complete this stream, and any I/O |
| /// errors which occur will be returned from this function. |
| </span><span class="kw">pub fn </span>finish(<span class="self">self</span>) -> io::Result<W> { |
| <span class="self">self</span>.inner.finish() |
| } |
| } |
| |
| <span class="kw">impl</span><W: Write> Write <span class="kw">for </span>MultiGzDecoder<W> { |
| <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="kw">if </span>buf.is_empty() { |
| <span class="prelude-val">Ok</span>(<span class="number">0</span>) |
| } <span class="kw">else </span>{ |
| <span class="kw">match </span><span class="self">self</span>.inner.write(buf) { |
| <span class="prelude-val">Ok</span>(<span class="number">0</span>) => { |
| <span class="comment">// When the GzDecoder indicates that it has finished |
| // create a new GzDecoder to handle additional data. |
| </span><span class="self">self</span>.inner.try_finish()<span class="question-mark">?</span>; |
| <span class="kw">let </span>w = <span class="self">self</span>.inner.inner.take_inner().into_inner(); |
| <span class="self">self</span>.inner = GzDecoder::new(w); |
| <span class="self">self</span>.inner.write(buf) |
| } |
| res => res, |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>flush(<span class="kw-2">&mut </span><span class="self">self</span>) -> io::Result<()> { |
| <span class="self">self</span>.inner.flush() |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="kw">const </span>STR: <span class="kw-2">&</span>str = <span class="string">"Hello World Hello World Hello World Hello World Hello World \ |
| Hello World Hello World Hello World Hello World Hello World \ |
| Hello World Hello World Hello World Hello World Hello World \ |
| Hello World Hello World Hello World Hello World Hello World \ |
| Hello World Hello World Hello World Hello World Hello World"</span>; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>decode_writer_one_chunk() { |
| <span class="kw">let </span><span class="kw-2">mut </span>e = GzEncoder::new(Vec::new(), Compression::default()); |
| e.write(STR.as_ref()).unwrap(); |
| <span class="kw">let </span>bytes = e.finish().unwrap(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>writer = Vec::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>decoder = GzDecoder::new(writer); |
| <span class="kw">let </span>n = decoder.write(<span class="kw-2">&</span>bytes[..]).unwrap(); |
| decoder.write(<span class="kw-2">&</span>bytes[n..]).unwrap(); |
| decoder.try_finish().unwrap(); |
| writer = decoder.finish().unwrap(); |
| <span class="kw">let </span>return_string = String::from_utf8(writer).expect(<span class="string">"String parsing error"</span>); |
| <span class="macro">assert_eq!</span>(return_string, STR); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>decode_writer_partial_header() { |
| <span class="kw">let </span><span class="kw-2">mut </span>e = GzEncoder::new(Vec::new(), Compression::default()); |
| e.write(STR.as_ref()).unwrap(); |
| <span class="kw">let </span>bytes = e.finish().unwrap(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>writer = Vec::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>decoder = GzDecoder::new(writer); |
| <span class="macro">assert_eq!</span>(decoder.write(<span class="kw-2">&</span>bytes[..<span class="number">5</span>]).unwrap(), <span class="number">5</span>); |
| <span class="kw">let </span>n = decoder.write(<span class="kw-2">&</span>bytes[<span class="number">5</span>..]).unwrap(); |
| <span class="kw">if </span>n < bytes.len() - <span class="number">5 </span>{ |
| decoder.write(<span class="kw-2">&</span>bytes[n + <span class="number">5</span>..]).unwrap(); |
| } |
| writer = decoder.finish().unwrap(); |
| <span class="kw">let </span>return_string = String::from_utf8(writer).expect(<span class="string">"String parsing error"</span>); |
| <span class="macro">assert_eq!</span>(return_string, STR); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>decode_writer_exact_header() { |
| <span class="kw">let </span><span class="kw-2">mut </span>e = GzEncoder::new(Vec::new(), Compression::default()); |
| e.write(STR.as_ref()).unwrap(); |
| <span class="kw">let </span>bytes = e.finish().unwrap(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>writer = Vec::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>decoder = GzDecoder::new(writer); |
| <span class="macro">assert_eq!</span>(decoder.write(<span class="kw-2">&</span>bytes[..<span class="number">10</span>]).unwrap(), <span class="number">10</span>); |
| decoder.write(<span class="kw-2">&</span>bytes[<span class="number">10</span>..]).unwrap(); |
| writer = decoder.finish().unwrap(); |
| <span class="kw">let </span>return_string = String::from_utf8(writer).expect(<span class="string">"String parsing error"</span>); |
| <span class="macro">assert_eq!</span>(return_string, STR); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>decode_writer_partial_crc() { |
| <span class="kw">let </span><span class="kw-2">mut </span>e = GzEncoder::new(Vec::new(), Compression::default()); |
| e.write(STR.as_ref()).unwrap(); |
| <span class="kw">let </span>bytes = e.finish().unwrap(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>writer = Vec::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>decoder = GzDecoder::new(writer); |
| <span class="kw">let </span>l = bytes.len() - <span class="number">5</span>; |
| <span class="kw">let </span>n = decoder.write(<span class="kw-2">&</span>bytes[..l]).unwrap(); |
| decoder.write(<span class="kw-2">&</span>bytes[n..]).unwrap(); |
| writer = decoder.finish().unwrap(); |
| <span class="kw">let </span>return_string = String::from_utf8(writer).expect(<span class="string">"String parsing error"</span>); |
| <span class="macro">assert_eq!</span>(return_string, STR); |
| } |
| |
| <span class="comment">// Two or more gzip files concatenated form a multi-member gzip file. MultiGzDecoder will |
| // concatenate the decoded contents of all members. |
| </span><span class="attribute">#[test] |
| </span><span class="kw">fn </span>decode_multi_writer() { |
| <span class="kw">let </span><span class="kw-2">mut </span>e = GzEncoder::new(Vec::new(), Compression::default()); |
| e.write(STR.as_ref()).unwrap(); |
| <span class="kw">let </span>bytes = e.finish().unwrap().repeat(<span class="number">2</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>writer = Vec::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>decoder = MultiGzDecoder::new(writer); |
| <span class="kw">let </span><span class="kw-2">mut </span>count = <span class="number">0</span>; |
| <span class="kw">while </span>count < bytes.len() { |
| <span class="kw">let </span>n = decoder.write(<span class="kw-2">&</span>bytes[count..]).unwrap(); |
| <span class="macro">assert!</span>(n != <span class="number">0</span>); |
| count += n; |
| } |
| writer = decoder.finish().unwrap(); |
| <span class="kw">let </span>return_string = String::from_utf8(writer).expect(<span class="string">"String parsing error"</span>); |
| <span class="kw">let </span>expected = STR.repeat(<span class="number">2</span>); |
| <span class="macro">assert_eq!</span>(return_string, expected); |
| } |
| } |
| </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> |
