| <!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/mem.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mem.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="764">764</span> |
| </pre><pre class="rust"><code><span class="kw">use </span>std::error::Error; |
| <span class="kw">use </span>std::fmt; |
| <span class="kw">use </span>std::io; |
| <span class="kw">use </span>std::slice; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::ffi::{<span class="self">self</span>, Backend, Deflate, DeflateBackend, ErrorMessage, Inflate, InflateBackend}; |
| <span class="kw">use </span><span class="kw">crate</span>::Compression; |
| |
| <span class="doccomment">/// Raw in-memory compression stream for blocks of data. |
| /// |
| /// This type is the building block for the I/O streams in the rest of this |
| /// crate. It requires more management than the [`Read`]/[`Write`] API but is |
| /// maximally flexible in terms of accepting input from any source and being |
| /// able to produce output to any memory location. |
| /// |
| /// It is recommended to use the I/O stream adaptors over this type as they're |
| /// easier to use. |
| /// |
| /// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html |
| /// [`Write`]: https://doc.rust-lang.org/std/io/trait.Write.html |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>Compress { |
| inner: Deflate, |
| } |
| |
| <span class="doccomment">/// Raw in-memory decompression stream for blocks of data. |
| /// |
| /// This type is the building block for the I/O streams in the rest of this |
| /// crate. It requires more management than the [`Read`]/[`Write`] API but is |
| /// maximally flexible in terms of accepting input from any source and being |
| /// able to produce output to any memory location. |
| /// |
| /// It is recommended to use the I/O stream adaptors over this type as they're |
| /// easier to use. |
| /// |
| /// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html |
| /// [`Write`]: https://doc.rust-lang.org/std/io/trait.Write.html |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>Decompress { |
| inner: Inflate, |
| } |
| |
| <span class="doccomment">/// Values which indicate the form of flushing to be used when compressing |
| /// in-memory data. |
| </span><span class="attribute">#[derive(Copy, Clone, PartialEq, Eq, Debug)] |
| #[non_exhaustive] |
| </span><span class="kw">pub enum </span>FlushCompress { |
| <span class="doccomment">/// A typical parameter for passing to compression/decompression functions, |
| /// this indicates that the underlying stream to decide how much data to |
| /// accumulate before producing output in order to maximize compression. |
| </span><span class="prelude-val">None </span>= ffi::MZ_NO_FLUSH <span class="kw">as </span>isize, |
| |
| <span class="doccomment">/// All pending output is flushed to the output buffer and the output is |
| /// aligned on a byte boundary so that the decompressor can get all input |
| /// data available so far. |
| /// |
| /// Flushing may degrade compression for some compression algorithms and so |
| /// it should only be used when necessary. This will complete the current |
| /// deflate block and follow it with an empty stored block. |
| </span>Sync = ffi::MZ_SYNC_FLUSH <span class="kw">as </span>isize, |
| |
| <span class="doccomment">/// All pending output is flushed to the output buffer, but the output is |
| /// not aligned to a byte boundary. |
| /// |
| /// All of the input data so far will be available to the decompressor (as |
| /// with `Flush::Sync`. This completes the current deflate block and follows |
| /// it with an empty fixed codes block that is 10 bites long, and it assures |
| /// that enough bytes are output in order for the decompressor to finish the |
| /// block before the empty fixed code block. |
| </span>Partial = ffi::MZ_PARTIAL_FLUSH <span class="kw">as </span>isize, |
| |
| <span class="doccomment">/// All output is flushed as with `Flush::Sync` and the compression state is |
| /// reset so decompression can restart from this point if previous |
| /// compressed data has been damaged or if random access is desired. |
| /// |
| /// Using this option too often can seriously degrade compression. |
| </span>Full = ffi::MZ_FULL_FLUSH <span class="kw">as </span>isize, |
| |
| <span class="doccomment">/// Pending input is processed and pending output is flushed. |
| /// |
| /// The return value may indicate that the stream is not yet done and more |
| /// data has yet to be processed. |
| </span>Finish = ffi::MZ_FINISH <span class="kw">as </span>isize, |
| } |
| |
| <span class="doccomment">/// Values which indicate the form of flushing to be used when |
| /// decompressing in-memory data. |
| </span><span class="attribute">#[derive(Copy, Clone, PartialEq, Eq, Debug)] |
| #[non_exhaustive] |
| </span><span class="kw">pub enum </span>FlushDecompress { |
| <span class="doccomment">/// A typical parameter for passing to compression/decompression functions, |
| /// this indicates that the underlying stream to decide how much data to |
| /// accumulate before producing output in order to maximize compression. |
| </span><span class="prelude-val">None </span>= ffi::MZ_NO_FLUSH <span class="kw">as </span>isize, |
| |
| <span class="doccomment">/// All pending output is flushed to the output buffer and the output is |
| /// aligned on a byte boundary so that the decompressor can get all input |
| /// data available so far. |
| /// |
| /// Flushing may degrade compression for some compression algorithms and so |
| /// it should only be used when necessary. This will complete the current |
| /// deflate block and follow it with an empty stored block. |
| </span>Sync = ffi::MZ_SYNC_FLUSH <span class="kw">as </span>isize, |
| |
| <span class="doccomment">/// Pending input is processed and pending output is flushed. |
| /// |
| /// The return value may indicate that the stream is not yet done and more |
| /// data has yet to be processed. |
| </span>Finish = ffi::MZ_FINISH <span class="kw">as </span>isize, |
| } |
| |
| <span class="doccomment">/// The inner state for an error when decompressing |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>DecompressErrorInner { |
| General { msg: ErrorMessage }, |
| NeedsDictionary(u32), |
| } |
| |
| <span class="doccomment">/// Error returned when a decompression object finds that the input stream of |
| /// bytes was not a valid input stream of bytes. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>DecompressError(<span class="kw">pub</span>(<span class="kw">crate</span>) DecompressErrorInner); |
| |
| <span class="kw">impl </span>DecompressError { |
| <span class="doccomment">/// Indicates whether decompression failed due to requiring a dictionary. |
| /// |
| /// The resulting integer is the Adler-32 checksum of the dictionary |
| /// required. |
| </span><span class="kw">pub fn </span>needs_dictionary(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><u32> { |
| <span class="kw">match </span><span class="self">self</span>.<span class="number">0 </span>{ |
| DecompressErrorInner::NeedsDictionary(adler) => <span class="prelude-val">Some</span>(adler), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>decompress_failed<T>(msg: ErrorMessage) -> <span class="prelude-ty">Result</span><T, DecompressError> { |
| <span class="prelude-val">Err</span>(DecompressError(DecompressErrorInner::General { msg })) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>decompress_need_dict<T>(adler: u32) -> <span class="prelude-ty">Result</span><T, DecompressError> { |
| <span class="prelude-val">Err</span>(DecompressError(DecompressErrorInner::NeedsDictionary( |
| adler, |
| ))) |
| } |
| |
| <span class="doccomment">/// Error returned when a compression object is used incorrectly or otherwise |
| /// generates an error. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>CompressError { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) msg: ErrorMessage, |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>compress_failed<T>(msg: ErrorMessage) -> <span class="prelude-ty">Result</span><T, CompressError> { |
| <span class="prelude-val">Err</span>(CompressError { msg }) |
| } |
| |
| <span class="doccomment">/// Possible status results of compressing some data or successfully |
| /// decompressing a block of data. |
| </span><span class="attribute">#[derive(Copy, Clone, PartialEq, Eq, Debug)] |
| </span><span class="kw">pub enum </span>Status { |
| <span class="doccomment">/// Indicates success. |
| /// |
| /// Means that more input may be needed but isn't available |
| /// and/or there's more output to be written but the output buffer is full. |
| </span><span class="prelude-val">Ok</span>, |
| |
| <span class="doccomment">/// Indicates that forward progress is not possible due to input or output |
| /// buffers being empty. |
| /// |
| /// For compression it means the input buffer needs some more data or the |
| /// output buffer needs to be freed up before trying again. |
| /// |
| /// For decompression this means that more input is needed to continue or |
| /// the output buffer isn't large enough to contain the result. The function |
| /// can be called again after fixing both. |
| </span>BufError, |
| |
| <span class="doccomment">/// Indicates that all input has been consumed and all output bytes have |
| /// been written. Decompression/compression should not be called again. |
| /// |
| /// For decompression with zlib streams the adler-32 of the decompressed |
| /// data has also been verified. |
| </span>StreamEnd, |
| } |
| |
| <span class="kw">impl </span>Compress { |
| <span class="doccomment">/// Creates a new object ready for compressing data that it's given. |
| /// |
| /// The `level` argument here indicates what level of compression is going |
| /// to be performed, and the `zlib_header` argument indicates whether the |
| /// output data should have a zlib header or not. |
| </span><span class="kw">pub fn </span>new(level: Compression, zlib_header: bool) -> Compress { |
| Compress { |
| inner: Deflate::make(level, zlib_header, ffi::MZ_DEFAULT_WINDOW_BITS <span class="kw">as </span>u8), |
| } |
| } |
| |
| <span class="doccomment">/// Creates a new object ready for compressing data that it's given. |
| /// |
| /// The `level` argument here indicates what level of compression is going |
| /// to be performed, and the `zlib_header` argument indicates whether the |
| /// output data should have a zlib header or not. The `window_bits` parameter |
| /// indicates the base-2 logarithm of the sliding window size and must be |
| /// between 9 and 15. |
| /// |
| /// # Panics |
| /// |
| /// If `window_bits` does not fall into the range 9 ..= 15, |
| /// `new_with_window_bits` will panic. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"any_zlib"</span>)] |
| </span><span class="kw">pub fn </span>new_with_window_bits( |
| level: Compression, |
| zlib_header: bool, |
| window_bits: u8, |
| ) -> Compress { |
| <span class="macro">assert!</span>( |
| window_bits > <span class="number">8 </span>&& window_bits < <span class="number">16</span>, |
| <span class="string">"window_bits must be within 9 ..= 15" |
| </span>); |
| Compress { |
| inner: Deflate::make(level, zlib_header, window_bits), |
| } |
| } |
| |
| <span class="doccomment">/// Creates a new object ready for compressing data that it's given. |
| /// |
| /// The `level` argument here indicates what level of compression is going |
| /// to be performed. |
| /// |
| /// The Compress object produced by this constructor outputs gzip headers |
| /// for the compressed data. |
| /// |
| /// # Panics |
| /// |
| /// If `window_bits` does not fall into the range 9 ..= 15, |
| /// `new_with_window_bits` will panic. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"any_zlib"</span>)] |
| </span><span class="kw">pub fn </span>new_gzip(level: Compression, window_bits: u8) -> Compress { |
| <span class="macro">assert!</span>( |
| window_bits > <span class="number">8 </span>&& window_bits < <span class="number">16</span>, |
| <span class="string">"window_bits must be within 9 ..= 15" |
| </span>); |
| Compress { |
| inner: Deflate::make(level, <span class="bool-val">true</span>, window_bits + <span class="number">16</span>), |
| } |
| } |
| |
| <span class="doccomment">/// Returns the total number of input bytes which have been processed by |
| /// this compression object. |
| </span><span class="kw">pub fn </span>total_in(<span class="kw-2">&</span><span class="self">self</span>) -> u64 { |
| <span class="self">self</span>.inner.total_in() |
| } |
| |
| <span class="doccomment">/// Returns the total number of output bytes which have been produced by |
| /// this compression object. |
| </span><span class="kw">pub fn </span>total_out(<span class="kw-2">&</span><span class="self">self</span>) -> u64 { |
| <span class="self">self</span>.inner.total_out() |
| } |
| |
| <span class="doccomment">/// Specifies the compression dictionary to use. |
| /// |
| /// Returns the Adler-32 checksum of the dictionary. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"any_zlib"</span>)] |
| </span><span class="kw">pub fn </span>set_dictionary(<span class="kw-2">&mut </span><span class="self">self</span>, dictionary: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Result</span><u32, CompressError> { |
| <span class="kw">let </span>stream = <span class="kw-2">&mut *</span><span class="self">self</span>.inner.inner.stream_wrapper; |
| stream.msg = std::ptr::null_mut(); |
| <span class="kw">let </span>rc = <span class="kw">unsafe </span>{ |
| <span class="macro">assert!</span>(dictionary.len() < ffi::uInt::MAX <span class="kw">as </span>usize); |
| ffi::deflateSetDictionary(stream, dictionary.as_ptr(), dictionary.len() <span class="kw">as </span>ffi::uInt) |
| }; |
| |
| <span class="kw">match </span>rc { |
| ffi::MZ_STREAM_ERROR => compress_failed(<span class="self">self</span>.inner.inner.msg()), |
| ffi::MZ_OK => <span class="prelude-val">Ok</span>(stream.adler <span class="kw">as </span>u32), |
| c => <span class="macro">panic!</span>(<span class="string">"unknown return code: {}"</span>, c), |
| } |
| } |
| |
| <span class="doccomment">/// Quickly resets this compressor without having to reallocate anything. |
| /// |
| /// This is equivalent to dropping this object and then creating a new one. |
| </span><span class="kw">pub fn </span>reset(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.inner.reset(); |
| } |
| |
| <span class="doccomment">/// Dynamically updates the compression level. |
| /// |
| /// This can be used to switch between compression levels for different |
| /// kinds of data, or it can be used in conjunction with a call to reset |
| /// to reuse the compressor. |
| /// |
| /// This may return an error if there wasn't enough output space to complete |
| /// the compression of the available input data before changing the |
| /// compression level. Flushing the stream before calling this method |
| /// ensures that the function will succeed on the first call. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"any_zlib"</span>)] |
| </span><span class="kw">pub fn </span>set_level(<span class="kw-2">&mut </span><span class="self">self</span>, level: Compression) -> <span class="prelude-ty">Result</span><(), CompressError> { |
| <span class="kw">use </span>std::os::raw::c_int; |
| <span class="kw">let </span>stream = <span class="kw-2">&mut *</span><span class="self">self</span>.inner.inner.stream_wrapper; |
| stream.msg = std::ptr::null_mut(); |
| |
| <span class="kw">let </span>rc = <span class="kw">unsafe </span>{ ffi::deflateParams(stream, level.<span class="number">0 </span><span class="kw">as </span>c_int, ffi::MZ_DEFAULT_STRATEGY) }; |
| |
| <span class="kw">match </span>rc { |
| ffi::MZ_OK => <span class="prelude-val">Ok</span>(()), |
| ffi::MZ_BUF_ERROR => compress_failed(<span class="self">self</span>.inner.inner.msg()), |
| c => <span class="macro">panic!</span>(<span class="string">"unknown return code: {}"</span>, c), |
| } |
| } |
| |
| <span class="doccomment">/// Compresses the input data into the output, consuming only as much |
| /// input as needed and writing as much output as possible. |
| /// |
| /// The flush option can be any of the available `FlushCompress` parameters. |
| /// |
| /// To learn how much data was consumed or how much output was produced, use |
| /// the `total_in` and `total_out` functions before/after this is called. |
| </span><span class="kw">pub fn </span>compress( |
| <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, CompressError> { |
| <span class="self">self</span>.inner.compress(input, output, flush) |
| } |
| |
| <span class="doccomment">/// Compresses the input data into the extra space of the output, consuming |
| /// only as much input as needed and writing as much output as possible. |
| /// |
| /// This function has the same semantics as `compress`, except that the |
| /// length of `vec` is managed by this function. This will not reallocate |
| /// the vector provided or attempt to grow it, so space for the output must |
| /// be reserved in the output vector by the caller before calling this |
| /// function. |
| </span><span class="kw">pub fn </span>compress_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, CompressError> { |
| <span class="kw">let </span>cap = output.capacity(); |
| <span class="kw">let </span>len = output.len(); |
| |
| <span class="kw">unsafe </span>{ |
| <span class="kw">let </span>before = <span class="self">self</span>.total_out(); |
| <span class="kw">let </span>ret = { |
| <span class="kw">let </span>ptr = output.as_mut_ptr().add(len); |
| <span class="kw">let </span>out = slice::from_raw_parts_mut(ptr, cap - len); |
| <span class="self">self</span>.compress(input, out, flush) |
| }; |
| output.set_len((<span class="self">self</span>.total_out() - before) <span class="kw">as </span>usize + len); |
| ret |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Decompress { |
| <span class="doccomment">/// Creates a new object ready for decompressing data that it's given. |
| /// |
| /// The `zlib_header` argument indicates whether the input data is expected |
| /// to have a zlib header or not. |
| </span><span class="kw">pub fn </span>new(zlib_header: bool) -> Decompress { |
| Decompress { |
| inner: Inflate::make(zlib_header, ffi::MZ_DEFAULT_WINDOW_BITS <span class="kw">as </span>u8), |
| } |
| } |
| |
| <span class="doccomment">/// Creates a new object ready for decompressing data that it's given. |
| /// |
| /// The `zlib_header` argument indicates whether the input data is expected |
| /// to have a zlib header or not. The `window_bits` parameter indicates the |
| /// base-2 logarithm of the sliding window size and must be between 9 and 15. |
| /// |
| /// # Panics |
| /// |
| /// If `window_bits` does not fall into the range 9 ..= 15, |
| /// `new_with_window_bits` will panic. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"any_zlib"</span>)] |
| </span><span class="kw">pub fn </span>new_with_window_bits(zlib_header: bool, window_bits: u8) -> Decompress { |
| <span class="macro">assert!</span>( |
| window_bits > <span class="number">8 </span>&& window_bits < <span class="number">16</span>, |
| <span class="string">"window_bits must be within 9 ..= 15" |
| </span>); |
| Decompress { |
| inner: Inflate::make(zlib_header, window_bits), |
| } |
| } |
| |
| <span class="doccomment">/// Creates a new object ready for decompressing data that it's given. |
| /// |
| /// The Decompress object produced by this constructor expects gzip headers |
| /// for the compressed data. |
| /// |
| /// # Panics |
| /// |
| /// If `window_bits` does not fall into the range 9 ..= 15, |
| /// `new_with_window_bits` will panic. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"any_zlib"</span>)] |
| </span><span class="kw">pub fn </span>new_gzip(window_bits: u8) -> Decompress { |
| <span class="macro">assert!</span>( |
| window_bits > <span class="number">8 </span>&& window_bits < <span class="number">16</span>, |
| <span class="string">"window_bits must be within 9 ..= 15" |
| </span>); |
| Decompress { |
| inner: Inflate::make(<span class="bool-val">true</span>, window_bits + <span class="number">16</span>), |
| } |
| } |
| |
| <span class="doccomment">/// Returns the total number of input bytes which have been processed by |
| /// this decompression object. |
| </span><span class="kw">pub fn </span>total_in(<span class="kw-2">&</span><span class="self">self</span>) -> u64 { |
| <span class="self">self</span>.inner.total_in() |
| } |
| |
| <span class="doccomment">/// Returns the total number of output bytes which have been produced by |
| /// this decompression object. |
| </span><span class="kw">pub fn </span>total_out(<span class="kw-2">&</span><span class="self">self</span>) -> u64 { |
| <span class="self">self</span>.inner.total_out() |
| } |
| |
| <span class="doccomment">/// Decompresses the input data into the output, consuming only as much |
| /// input as needed and writing as much output as possible. |
| /// |
| /// The flush option can be any of the available `FlushDecompress` parameters. |
| /// |
| /// If the first call passes `FlushDecompress::Finish` it is assumed that |
| /// the input and output buffers are both sized large enough to decompress |
| /// the entire stream in a single call. |
| /// |
| /// A flush value of `FlushDecompress::Finish` indicates that there are no |
| /// more source bytes available beside what's already in the input buffer, |
| /// and the output buffer is large enough to hold the rest of the |
| /// decompressed data. |
| /// |
| /// To learn how much data was consumed or how much output was produced, use |
| /// the `total_in` and `total_out` functions before/after this is called. |
| /// |
| /// # Errors |
| /// |
| /// If the input data to this instance of `Decompress` is not a valid |
| /// zlib/deflate stream then this function may return an instance of |
| /// `DecompressError` to indicate that the stream of input bytes is corrupted. |
| </span><span class="kw">pub fn </span>decompress( |
| <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>.inner.decompress(input, output, flush) |
| } |
| |
| <span class="doccomment">/// Decompresses the input data into the extra space in the output vector |
| /// specified by `output`. |
| /// |
| /// This function has the same semantics as `decompress`, except that the |
| /// length of `vec` is managed by this function. This will not reallocate |
| /// the vector provided or attempt to grow it, so space for the output must |
| /// be reserved in the output vector by the caller before calling this |
| /// function. |
| /// |
| /// # Errors |
| /// |
| /// If the input data to this instance of `Decompress` is not a valid |
| /// zlib/deflate stream then this function may return an instance of |
| /// `DecompressError` to indicate that the stream of input bytes is corrupted. |
| </span><span class="kw">pub fn </span>decompress_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="kw">let </span>cap = output.capacity(); |
| <span class="kw">let </span>len = output.len(); |
| |
| <span class="kw">unsafe </span>{ |
| <span class="kw">let </span>before = <span class="self">self</span>.total_out(); |
| <span class="kw">let </span>ret = { |
| <span class="kw">let </span>ptr = output.as_mut_ptr().add(len); |
| <span class="kw">let </span>out = slice::from_raw_parts_mut(ptr, cap - len); |
| <span class="self">self</span>.decompress(input, out, flush) |
| }; |
| output.set_len((<span class="self">self</span>.total_out() - before) <span class="kw">as </span>usize + len); |
| ret |
| } |
| } |
| |
| <span class="doccomment">/// Specifies the decompression dictionary to use. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"any_zlib"</span>)] |
| </span><span class="kw">pub fn </span>set_dictionary(<span class="kw-2">&mut </span><span class="self">self</span>, dictionary: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Result</span><u32, DecompressError> { |
| <span class="kw">let </span>stream = <span class="kw-2">&mut *</span><span class="self">self</span>.inner.inner.stream_wrapper; |
| stream.msg = std::ptr::null_mut(); |
| <span class="kw">let </span>rc = <span class="kw">unsafe </span>{ |
| <span class="macro">assert!</span>(dictionary.len() < ffi::uInt::MAX <span class="kw">as </span>usize); |
| ffi::inflateSetDictionary(stream, dictionary.as_ptr(), dictionary.len() <span class="kw">as </span>ffi::uInt) |
| }; |
| |
| <span class="kw">match </span>rc { |
| ffi::MZ_STREAM_ERROR => decompress_failed(<span class="self">self</span>.inner.inner.msg()), |
| ffi::MZ_DATA_ERROR => decompress_need_dict(stream.adler <span class="kw">as </span>u32), |
| ffi::MZ_OK => <span class="prelude-val">Ok</span>(stream.adler <span class="kw">as </span>u32), |
| c => <span class="macro">panic!</span>(<span class="string">"unknown return code: {}"</span>, c), |
| } |
| } |
| |
| <span class="doccomment">/// Performs the equivalent of replacing this decompression state with a |
| /// freshly allocated copy. |
| /// |
| /// This function may not allocate memory, though, and attempts to reuse any |
| /// previously existing resources. |
| /// |
| /// The argument provided here indicates whether the reset state will |
| /// attempt to decode a zlib header first or not. |
| </span><span class="kw">pub fn </span>reset(<span class="kw-2">&mut </span><span class="self">self</span>, zlib_header: bool) { |
| <span class="self">self</span>.inner.reset(zlib_header); |
| } |
| } |
| |
| <span class="kw">impl </span>Error <span class="kw">for </span>DecompressError {} |
| |
| <span class="kw">impl </span>DecompressError { |
| <span class="doccomment">/// Retrieve the implementation's message about why the operation failed, if one exists. |
| </span><span class="kw">pub fn </span>message(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>str> { |
| <span class="kw">match </span><span class="kw-2">&</span><span class="self">self</span>.<span class="number">0 </span>{ |
| DecompressErrorInner::General { msg } => msg.get(), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>From<DecompressError> <span class="kw">for </span>io::Error { |
| <span class="kw">fn </span>from(data: DecompressError) -> io::Error { |
| io::Error::new(io::ErrorKind::Other, data) |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Display <span class="kw">for </span>DecompressError { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">let </span>msg = <span class="kw">match </span><span class="kw-2">&</span><span class="self">self</span>.<span class="number">0 </span>{ |
| DecompressErrorInner::General { msg } => msg.get(), |
| DecompressErrorInner::NeedsDictionary { .. } => <span class="prelude-val">Some</span>(<span class="string">"requires a dictionary"</span>), |
| }; |
| <span class="kw">match </span>msg { |
| <span class="prelude-val">Some</span>(msg) => <span class="macro">write!</span>(f, <span class="string">"deflate decompression error: {}"</span>, msg), |
| <span class="prelude-val">None </span>=> <span class="macro">write!</span>(f, <span class="string">"deflate decompression error"</span>), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Error <span class="kw">for </span>CompressError {} |
| |
| <span class="kw">impl </span>CompressError { |
| <span class="doccomment">/// Retrieve the implementation's message about why the operation failed, if one exists. |
| </span><span class="kw">pub fn </span>message(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>str> { |
| <span class="self">self</span>.msg.get() |
| } |
| } |
| |
| <span class="kw">impl </span>From<CompressError> <span class="kw">for </span>io::Error { |
| <span class="kw">fn </span>from(data: CompressError) -> io::Error { |
| io::Error::new(io::ErrorKind::Other, data) |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Display <span class="kw">for </span>CompressError { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">match </span><span class="self">self</span>.msg.get() { |
| <span class="prelude-val">Some</span>(msg) => <span class="macro">write!</span>(f, <span class="string">"deflate compression error: {}"</span>, msg), |
| <span class="prelude-val">None </span>=> <span class="macro">write!</span>(f, <span class="string">"deflate compression error"</span>), |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use </span>std::io::Write; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::write; |
| <span class="kw">use crate</span>::{Compression, Decompress, FlushDecompress}; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"any_zlib"</span>)] |
| </span><span class="kw">use crate</span>::{Compress, FlushCompress}; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>issue51() { |
| <span class="kw">let </span>data = <span class="macro">vec!</span>[ |
| <span class="number">0x1f</span>, <span class="number">0x8b</span>, <span class="number">0x08</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x03</span>, <span class="number">0xb3</span>, <span class="number">0xc9</span>, <span class="number">0x28</span>, <span class="number">0xc9</span>, |
| <span class="number">0xcd</span>, <span class="number">0xb1</span>, <span class="number">0xe3</span>, <span class="number">0xe5</span>, <span class="number">0xb2</span>, <span class="number">0xc9</span>, <span class="number">0x48</span>, <span class="number">0x4d</span>, <span class="number">0x4c</span>, <span class="number">0xb1</span>, <span class="number">0xb3</span>, <span class="number">0x29</span>, <span class="number">0xc9</span>, <span class="number">0x2c</span>, |
| <span class="number">0xc9</span>, <span class="number">0x49</span>, <span class="number">0xb5</span>, <span class="number">0x33</span>, <span class="number">0x31</span>, <span class="number">0x30</span>, <span class="number">0x51</span>, <span class="number">0xf0</span>, <span class="number">0xcb</span>, <span class="number">0x2f</span>, <span class="number">0x51</span>, <span class="number">0x70</span>, <span class="number">0xcb</span>, <span class="number">0x2f</span>, |
| <span class="number">0xcd</span>, <span class="number">0x4b</span>, <span class="number">0xb1</span>, <span class="number">0xd1</span>, <span class="number">0x87</span>, <span class="number">0x08</span>, <span class="number">0xda</span>, <span class="number">0xe8</span>, <span class="number">0x83</span>, <span class="number">0x95</span>, <span class="number">0x00</span>, <span class="number">0x95</span>, <span class="number">0x26</span>, <span class="number">0xe5</span>, |
| <span class="number">0xa7</span>, <span class="number">0x54</span>, <span class="number">0x2a</span>, <span class="number">0x24</span>, <span class="number">0xa5</span>, <span class="number">0x27</span>, <span class="number">0xe7</span>, <span class="number">0xe7</span>, <span class="number">0xe4</span>, <span class="number">0x17</span>, <span class="number">0xd9</span>, <span class="number">0x2a</span>, <span class="number">0x95</span>, <span class="number">0x67</span>, |
| <span class="number">0x64</span>, <span class="number">0x96</span>, <span class="number">0xa4</span>, <span class="number">0x2a</span>, <span class="number">0x81</span>, <span class="number">0x8c</span>, <span class="number">0x48</span>, <span class="number">0x4e</span>, <span class="number">0xcd</span>, <span class="number">0x2b</span>, <span class="number">0x49</span>, <span class="number">0x2d</span>, <span class="number">0xb2</span>, <span class="number">0xb3</span>, |
| <span class="number">0xc9</span>, <span class="number">0x30</span>, <span class="number">0x44</span>, <span class="number">0x37</span>, <span class="number">0x01</span>, <span class="number">0x28</span>, <span class="number">0x62</span>, <span class="number">0xa3</span>, <span class="number">0x0f</span>, <span class="number">0x95</span>, <span class="number">0x06</span>, <span class="number">0xd9</span>, <span class="number">0x05</span>, <span class="number">0x54</span>, |
| <span class="number">0x04</span>, <span class="number">0xe5</span>, <span class="number">0xe5</span>, <span class="number">0xa5</span>, <span class="number">0x67</span>, <span class="number">0xe6</span>, <span class="number">0x55</span>, <span class="number">0xe8</span>, <span class="number">0x1b</span>, <span class="number">0xea</span>, <span class="number">0x99</span>, <span class="number">0xe9</span>, <span class="number">0x19</span>, <span class="number">0x21</span>, |
| <span class="number">0xab</span>, <span class="number">0xd0</span>, <span class="number">0x07</span>, <span class="number">0xd9</span>, <span class="number">0x01</span>, <span class="number">0x32</span>, <span class="number">0x53</span>, <span class="number">0x1f</span>, <span class="number">0xea</span>, <span class="number">0x3e</span>, <span class="number">0x00</span>, <span class="number">0x94</span>, <span class="number">0x85</span>, <span class="number">0xeb</span>, |
| <span class="number">0xe4</span>, <span class="number">0xa8</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, |
| ]; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>decoded = Vec::with_capacity(data.len() * <span class="number">2</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>d = Decompress::new(<span class="bool-val">false</span>); |
| <span class="comment">// decompressed whole deflate stream |
| </span><span class="macro">assert!</span>(d |
| .decompress_vec(<span class="kw-2">&</span>data[<span class="number">10</span>..], <span class="kw-2">&mut </span>decoded, FlushDecompress::Finish) |
| .is_ok()); |
| |
| <span class="comment">// decompress data that has nothing to do with the deflate stream (this |
| // used to panic) |
| </span>drop(d.decompress_vec(<span class="kw-2">&</span>[<span class="number">0</span>], <span class="kw-2">&mut </span>decoded, FlushDecompress::None)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>reset() { |
| <span class="kw">let </span>string = <span class="string">"hello world"</span>.as_bytes(); |
| <span class="kw">let </span><span class="kw-2">mut </span>zlib = Vec::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>deflate = Vec::new(); |
| |
| <span class="kw">let </span>comp = Compression::default(); |
| write::ZlibEncoder::new(<span class="kw-2">&mut </span>zlib, comp) |
| .write_all(string) |
| .unwrap(); |
| write::DeflateEncoder::new(<span class="kw-2">&mut </span>deflate, comp) |
| .write_all(string) |
| .unwrap(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>dst = [<span class="number">0</span>; <span class="number">1024</span>]; |
| <span class="kw">let </span><span class="kw-2">mut </span>decoder = Decompress::new(<span class="bool-val">true</span>); |
| decoder |
| .decompress(<span class="kw-2">&</span>zlib, <span class="kw-2">&mut </span>dst, FlushDecompress::Finish) |
| .unwrap(); |
| <span class="macro">assert_eq!</span>(decoder.total_out(), string.len() <span class="kw">as </span>u64); |
| <span class="macro">assert!</span>(dst.starts_with(string)); |
| |
| decoder.reset(<span class="bool-val">false</span>); |
| decoder |
| .decompress(<span class="kw-2">&</span>deflate, <span class="kw-2">&mut </span>dst, FlushDecompress::Finish) |
| .unwrap(); |
| <span class="macro">assert_eq!</span>(decoder.total_out(), string.len() <span class="kw">as </span>u64); |
| <span class="macro">assert!</span>(dst.starts_with(string)); |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"any_zlib"</span>)] |
| #[test] |
| </span><span class="kw">fn </span>set_dictionary_with_zlib_header() { |
| <span class="kw">let </span>string = <span class="string">"hello, hello!"</span>.as_bytes(); |
| <span class="kw">let </span>dictionary = <span class="string">"hello"</span>.as_bytes(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>encoded = Vec::with_capacity(<span class="number">1024</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>encoder = Compress::new(Compression::default(), <span class="bool-val">true</span>); |
| |
| <span class="kw">let </span>dictionary_adler = encoder.set_dictionary(<span class="kw-2">&</span>dictionary).unwrap(); |
| |
| encoder |
| .compress_vec(string, <span class="kw-2">&mut </span>encoded, FlushCompress::Finish) |
| .unwrap(); |
| |
| <span class="macro">assert_eq!</span>(encoder.total_in(), string.len() <span class="kw">as </span>u64); |
| <span class="macro">assert_eq!</span>(encoder.total_out(), encoded.len() <span class="kw">as </span>u64); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>decoder = Decompress::new(<span class="bool-val">true</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>decoded = [<span class="number">0</span>; <span class="number">1024</span>]; |
| <span class="kw">let </span>decompress_error = decoder |
| .decompress(<span class="kw-2">&</span>encoded, <span class="kw-2">&mut </span>decoded, FlushDecompress::Finish) |
| .expect_err(<span class="string">"decompression should fail due to requiring a dictionary"</span>); |
| |
| <span class="kw">let </span>required_adler = decompress_error.needs_dictionary() |
| .expect(<span class="string">"the first call to decompress should indicate a dictionary is required along with the required Adler-32 checksum"</span>); |
| |
| <span class="macro">assert_eq!</span>(required_adler, dictionary_adler, |
| <span class="string">"the Adler-32 checksum should match the value when the dictionary was set on the compressor"</span>); |
| |
| <span class="kw">let </span>actual_adler = decoder.set_dictionary(<span class="kw-2">&</span>dictionary).unwrap(); |
| |
| <span class="macro">assert_eq!</span>(required_adler, actual_adler); |
| |
| <span class="comment">// Decompress the rest of the input to the remainder of the output buffer |
| </span><span class="kw">let </span>total_in = decoder.total_in(); |
| <span class="kw">let </span>total_out = decoder.total_out(); |
| |
| <span class="kw">let </span>decompress_result = decoder.decompress( |
| <span class="kw-2">&</span>encoded[total_in <span class="kw">as </span>usize..], |
| <span class="kw-2">&mut </span>decoded[total_out <span class="kw">as </span>usize..], |
| FlushDecompress::Finish, |
| ); |
| <span class="macro">assert!</span>(decompress_result.is_ok()); |
| |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>decoded[..decoder.total_out() <span class="kw">as </span>usize], string); |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"any_zlib"</span>)] |
| #[test] |
| </span><span class="kw">fn </span>set_dictionary_raw() { |
| <span class="kw">let </span>string = <span class="string">"hello, hello!"</span>.as_bytes(); |
| <span class="kw">let </span>dictionary = <span class="string">"hello"</span>.as_bytes(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>encoded = Vec::with_capacity(<span class="number">1024</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>encoder = Compress::new(Compression::default(), <span class="bool-val">false</span>); |
| |
| encoder.set_dictionary(<span class="kw-2">&</span>dictionary).unwrap(); |
| |
| encoder |
| .compress_vec(string, <span class="kw-2">&mut </span>encoded, FlushCompress::Finish) |
| .unwrap(); |
| |
| <span class="macro">assert_eq!</span>(encoder.total_in(), string.len() <span class="kw">as </span>u64); |
| <span class="macro">assert_eq!</span>(encoder.total_out(), encoded.len() <span class="kw">as </span>u64); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>decoder = Decompress::new(<span class="bool-val">false</span>); |
| |
| decoder.set_dictionary(<span class="kw-2">&</span>dictionary).unwrap(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>decoded = [<span class="number">0</span>; <span class="number">1024</span>]; |
| <span class="kw">let </span>decompress_result = decoder.decompress(<span class="kw-2">&</span>encoded, <span class="kw-2">&mut </span>decoded, FlushDecompress::Finish); |
| |
| <span class="macro">assert!</span>(decompress_result.is_ok()); |
| |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>decoded[..decoder.total_out() <span class="kw">as </span>usize], string); |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"any_zlib"</span>)] |
| #[test] |
| </span><span class="kw">fn </span>test_gzip_flate() { |
| <span class="kw">let </span>string = <span class="string">"hello, hello!"</span>.as_bytes(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>encoded = Vec::with_capacity(<span class="number">1024</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>encoder = Compress::new_gzip(Compression::default(), <span class="number">9</span>); |
| |
| encoder |
| .compress_vec(string, <span class="kw-2">&mut </span>encoded, FlushCompress::Finish) |
| .unwrap(); |
| |
| <span class="macro">assert_eq!</span>(encoder.total_in(), string.len() <span class="kw">as </span>u64); |
| <span class="macro">assert_eq!</span>(encoder.total_out(), encoded.len() <span class="kw">as </span>u64); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>decoder = Decompress::new_gzip(<span class="number">9</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>decoded = [<span class="number">0</span>; <span class="number">1024</span>]; |
| decoder |
| .decompress(<span class="kw-2">&</span>encoded, <span class="kw-2">&mut </span>decoded, FlushDecompress::Finish) |
| .unwrap(); |
| |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>decoded[..decoder.total_out() <span class="kw">as </span>usize], string); |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"any_zlib"</span>)] |
| #[test] |
| </span><span class="kw">fn </span>test_error_message() { |
| <span class="kw">let </span><span class="kw-2">mut </span>decoder = Decompress::new(<span class="bool-val">false</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>decoded = [<span class="number">0</span>; <span class="number">128</span>]; |
| <span class="kw">let </span>garbage = <span class="string">b"xbvxzi"</span>; |
| |
| <span class="kw">let </span>err = decoder |
| .decompress(<span class="kw-2">&*</span>garbage, <span class="kw-2">&mut </span>decoded, FlushDecompress::Finish) |
| .unwrap_err(); |
| |
| <span class="macro">assert_eq!</span>(err.message(), <span class="prelude-val">Some</span>(<span class="string">"invalid stored block lengths"</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> |
