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<!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 `/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/zstd-0.7.0+zstd.1.4.9/src/dict.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>dict.rs - source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><script src="../../crates.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">//! Train a dictionary from various sources.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! A dictionary can help improve the compression of small files.</span>
<span class="doccomment">//! The dictionary must be present during decompression,</span>
<span class="doccomment">//! but can be shared accross multiple "similar" files.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Creating a dictionary using the `zstd` C library,</span>
<span class="doccomment">//! using the `zstd` command-line interface, using this library,</span>
<span class="doccomment">//! or using the `train` binary provided, should give the same result,</span>
<span class="doccomment">//! and are therefore completely compatible.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! To use, see [`Encoder::with_dictionary`] or [`Decoder::with_dictionary`].</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [`Encoder::with_dictionary`]: ../struct.Encoder.html#method.with_dictionary</span>
<span class="doccomment">//! [`Decoder::with_dictionary`]: ../struct.Decoder.html#method.with_dictionary</span>
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">map_error_code</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fs</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="self">self</span>, <span class="ident">Read</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">path</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">zstd_safe</span>::{<span class="ident">CDict</span>, <span class="ident">DDict</span>};
<span class="doccomment">/// Prepared dictionary for compression</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">EncoderDictionary</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">cdict</span>: <span class="ident">CDict</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>,
}
<span class="kw">impl</span> <span class="ident">EncoderDictionary</span><span class="op"><</span><span class="lifetime">'static</span><span class="op">></span> {
<span class="doccomment">/// Creates a prepared dictionary for compression.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This will copy the dictionary internally.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">copy</span>(<span class="ident">dictionary</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>], <span class="ident">level</span>: <span class="ident">i32</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">Self</span> {
<span class="ident">cdict</span>: <span class="ident">zstd_safe</span>::<span class="ident">create_cdict</span>(<span class="ident">dictionary</span>, <span class="ident">level</span>),
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">EncoderDictionary</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"experimental"</span>)]</span>
<span class="doccomment">/// Create prepared dictionary for compression</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A level of `0` uses zstd's default (currently `3`).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Only available with the `experimental` feature. Use `EncoderDictionary::copy` otherwise.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">dictionary</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">u8</span>], <span class="ident">level</span>: <span class="ident">i32</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">Self</span> {
<span class="ident">cdict</span>: <span class="ident">zstd_safe</span>::<span class="ident">create_cdict_by_reference</span>(<span class="ident">dictionary</span>, <span class="ident">level</span>),
}
}
<span class="doccomment">/// Returns reference to `CDict` inner object</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_cdict</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">CDict</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">cdict</span>
}
}
<span class="doccomment">/// Prepared dictionary for decompression</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">DecoderDictionary</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">ddict</span>: <span class="ident">DDict</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>,
}
<span class="kw">impl</span> <span class="ident">DecoderDictionary</span><span class="op"><</span><span class="lifetime">'static</span><span class="op">></span> {
<span class="doccomment">/// Create a prepared dictionary for decompression.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This will copy the dictionary internally.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">copy</span>(<span class="ident">dictionary</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">Self</span> {
<span class="ident">ddict</span>: <span class="ident">zstd_safe</span>::<span class="ident">DDict</span>::<span class="ident">create</span>(<span class="ident">dictionary</span>),
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">DecoderDictionary</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"experimental"</span>)]</span>
<span class="doccomment">/// Create prepared dictionary for decompression</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Only available with the `experimental` feature. Use `DecoderDictionary::copy` otherwise.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">dict</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">Self</span> {
<span class="ident">ddict</span>: <span class="ident">zstd_safe</span>::<span class="ident">create_ddict_by_reference</span>(<span class="ident">dict</span>),
}
}
<span class="doccomment">/// Returns reference to `DDict` inner object</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_ddict</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">DDict</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">ddict</span>
}
}
<span class="doccomment">/// Train a dictionary from a big continuous chunk of data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is the most efficient way to train a dictionary,</span>
<span class="doccomment">/// since this is directly fed into `zstd`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_continuous</span>(
<span class="ident">sample_data</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>],
<span class="ident">sample_sizes</span>: <span class="kw-2">&</span>[<span class="ident">usize</span>],
<span class="ident">max_size</span>: <span class="ident">usize</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span><span class="op">></span> {
<span class="comment">// Complain if the lengths don't add up to the entire data.</span>
<span class="kw">if</span> <span class="ident">sample_sizes</span>.<span class="ident">iter</span>().<span class="ident">sum</span>::<span class="op"><</span><span class="ident">usize</span><span class="op">></span>() <span class="op">!</span><span class="op">=</span> <span class="ident">sample_data</span>.<span class="ident">len</span>() {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>(
<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">Other</span>,
<span class="string">"sample sizes don't add up"</span>.<span class="ident">to_string</span>(),
));
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">max_size</span>);
<span class="kw">unsafe</span> {
<span class="ident">result</span>.<span class="ident">set_len</span>(<span class="ident">max_size</span>);
<span class="kw">let</span> <span class="ident">written</span> <span class="op">=</span> <span class="ident">zstd_safe</span>::<span class="ident">train_from_buffer</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">result</span>,
<span class="ident">sample_data</span>,
<span class="ident">sample_sizes</span>,
)
.<span class="ident">map_err</span>(<span class="ident">map_error_code</span>)<span class="question-mark">?</span>;
<span class="ident">result</span>.<span class="ident">set_len</span>(<span class="ident">written</span>);
}
<span class="prelude-val">Ok</span>(<span class="ident">result</span>)
}
<span class="doccomment">/// Train a dictionary from multiple samples.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The samples will internaly be copied to a single continuous buffer,</span>
<span class="doccomment">/// so make sure you have enough memory available.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If you need to stretch your system's limits,</span>
<span class="doccomment">/// [`from_continuous`] directly uses the given slice.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`from_continuous`]: ./fn.from_continuous.html</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_samples</span><span class="op"><</span><span class="ident">S</span>: <span class="ident">AsRef</span><span class="op"><</span>[<span class="ident">u8</span>]<span class="op">></span><span class="op">></span>(
<span class="ident">samples</span>: <span class="kw-2">&</span>[<span class="ident">S</span>],
<span class="ident">max_size</span>: <span class="ident">usize</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span><span class="op">></span> {
<span class="comment">// Copy every sample to a big chunk of memory</span>
<span class="kw">let</span> <span class="ident">data</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span> <span class="op">=</span>
<span class="ident">samples</span>.<span class="ident">iter</span>().<span class="ident">flat_map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">as_ref</span>()).<span class="ident">cloned</span>().<span class="ident">collect</span>();
<span class="kw">let</span> <span class="ident">sizes</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span> <span class="op">=</span> <span class="ident">samples</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">as_ref</span>().<span class="ident">len</span>()).<span class="ident">collect</span>();
<span class="ident">from_continuous</span>(<span class="kw-2">&</span><span class="ident">data</span>, <span class="kw-2">&</span><span class="ident">sizes</span>, <span class="ident">max_size</span>)
}
<span class="doccomment">/// Train a dict from a list of files.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_files</span><span class="op"><</span><span class="ident">I</span>, <span class="ident">P</span><span class="op">></span>(<span class="ident">filenames</span>: <span class="ident">I</span>, <span class="ident">max_size</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">P</span>: <span class="ident">AsRef</span><span class="op"><</span><span class="ident">path</span>::<span class="ident">Path</span><span class="op">></span>,
<span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">P</span><span class="op">></span>,
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buffer</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">sizes</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
<span class="kw">for</span> <span class="ident">filename</span> <span class="kw">in</span> <span class="ident">filenames</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">file</span> <span class="op">=</span> <span class="ident">fs</span>::<span class="ident">File</span>::<span class="ident">open</span>(<span class="ident">filename</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">file</span>.<span class="ident">read_to_end</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buffer</span>)<span class="question-mark">?</span>;
<span class="ident">sizes</span>.<span class="ident">push</span>(<span class="ident">len</span>);
}
<span class="ident">from_continuous</span>(<span class="kw-2">&</span><span class="ident">buffer</span>, <span class="kw-2">&</span><span class="ident">sizes</span>, <span class="ident">max_size</span>)
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fs</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Read</span>;
<span class="kw">use</span> <span class="ident">walkdir</span>;
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_dict_training</span>() {
<span class="comment">// Train a dictionary</span>
<span class="kw">let</span> <span class="ident">paths</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span> <span class="op">=</span> <span class="ident">walkdir</span>::<span class="ident">WalkDir</span>::<span class="ident">new</span>(<span class="string">"src"</span>)
.<span class="ident">into_iter</span>()
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">entry</span><span class="op">|</span> <span class="ident">entry</span>.<span class="ident">unwrap</span>())
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">entry</span><span class="op">|</span> <span class="ident">entry</span>.<span class="ident">into_path</span>())
.<span class="ident">filter</span>(<span class="op">|</span><span class="ident">path</span><span class="op">|</span> <span class="ident">path</span>.<span class="ident">to_str</span>().<span class="ident">unwrap</span>().<span class="ident">ends_with</span>(<span class="string">".rs"</span>))
.<span class="ident">collect</span>();
<span class="kw">let</span> <span class="ident">dict</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">from_files</span>(<span class="kw-2">&</span><span class="ident">paths</span>, <span class="number">4000</span>).<span class="ident">unwrap</span>();
<span class="kw">for</span> <span class="ident">path</span> <span class="kw">in</span> <span class="ident">paths</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buffer</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">file</span> <span class="op">=</span> <span class="ident">fs</span>::<span class="ident">File</span>::<span class="ident">open</span>(<span class="ident">path</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">content</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
<span class="ident">file</span>.<span class="ident">read_to_end</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">content</span>).<span class="ident">unwrap</span>();
<span class="ident">io</span>::<span class="ident">copy</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">&</span><span class="ident">content</span>[..],
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw">crate</span>::<span class="ident">stream</span>::<span class="ident">Encoder</span>::<span class="ident">with_dictionary</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buffer</span>,
<span class="number">1</span>,
<span class="kw-2">&</span><span class="ident">dict</span>,
)
.<span class="ident">unwrap</span>()
.<span class="ident">auto_finish</span>(),
)
.<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
<span class="ident">io</span>::<span class="ident">copy</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw">crate</span>::<span class="ident">stream</span>::<span class="ident">Decoder</span>::<span class="ident">with_dictionary</span>(
<span class="kw-2">&</span><span class="ident">buffer</span>[..],
<span class="kw-2">&</span><span class="ident">dict</span>[..],
)
.<span class="ident">unwrap</span>(),
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">result</span>,
)
.<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">content</span>, <span class="kw-2">&</span><span class="ident">result</span>);
}
}
}
</pre></div>
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