<!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/sangenya/.cargo/registry/src/github.com-1ecc6299db9ec823/inflate-0.3.4/src/checksum.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>checksum.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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<span class="kw">use</span> <span class="ident">adler32::RollingAdler32</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">adler32_from_bytes</span>(<span class="ident">bytes</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>; <span class="number">4</span>]) <span class="op">-</span><span class="op">></span> <span class="ident">u32</span> {
<span class="kw">let</span> <span class="ident">val</span>: <span class="ident">u32</span> <span class="op">=</span> (<span class="ident">bytes</span>[<span class="number">0</span>] <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">|</span> ((<span class="ident">bytes</span>[<span class="number">1</span>] <span class="kw">as</span> <span class="ident">u32</span>) <span class="op"><</span><span class="op"><</span> <span class="number">8</span>) <span class="op">|</span>
((<span class="ident">bytes</span>[<span class="number">2</span>] <span class="kw">as</span> <span class="ident">u32</span>) <span class="op"><</span><span class="op"><</span> <span class="number">16</span>) <span class="op">|</span> ((<span class="ident">bytes</span>[<span class="number">3</span>] <span class="kw">as</span> <span class="ident">u32</span>) <span class="op"><</span><span class="op"><</span> <span class="number">24</span>);
<span class="ident">u32::from_be</span>(<span class="ident">val</span>)
}
<span class="doccomment">/// Whether we should validate the checksum, and what type of checksum it is.</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">ChecksumType</span> {
<span class="doccomment">/// No validation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For raw deflate streams or when we don't bother checking.</span>
<span class="prelude-val">None</span>,
<span class="doccomment">/// Adler32</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Used in the zlib format.</span>
<span class="ident">Adler32</span>(<span class="ident">RollingAdler32</span>),
}
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Checksum</span> {
<span class="ident">checksum_type</span>: <span class="ident">ChecksumType</span>,
}
<span class="kw">impl</span> <span class="ident">Checksum</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">none</span>() <span class="op">-</span><span class="op">></span> <span class="ident">Checksum</span> {
<span class="ident">Checksum::new</span>(<span class="ident">ChecksumType::None</span>)
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_none</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">checksum_type</span> {
<span class="ident">ChecksumType::None</span> <span class="op">=</span><span class="op">></span> <span class="bool-val">true</span>,
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="bool-val">false</span>,
}
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">zlib</span>() <span class="op">-</span><span class="op">></span> <span class="ident">Checksum</span> {
<span class="ident">Checksum::new</span>(<span class="ident">ChecksumType::Adler32</span>(<span class="ident">RollingAdler32::new</span>()))
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">checksum_type</span>: <span class="ident">ChecksumType</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Checksum</span> {
<span class="ident">Checksum</span> {
<span class="ident">checksum_type</span>: <span class="ident">checksum_type</span>,
}
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">update</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">bytes</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">checksum_type</span> {
<span class="ident">ChecksumType::None</span> <span class="op">=</span><span class="op">></span> (),
<span class="ident">ChecksumType::Adler32</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">c</span>) <span class="op">=</span><span class="op">></span> {
<span class="ident">c</span>.<span class="ident">update_buffer</span>(<span class="ident">bytes</span>);
}
}
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">check</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">expected</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">String</span><span class="op">></span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">checksum_type</span> {
<span class="ident">ChecksumType::None</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(()),
<span class="ident">ChecksumType::Adler32</span>(<span class="kw-2">ref</span> <span class="ident">c</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">c</span>.<span class="ident">hash</span>() <span class="op">=</span><span class="op">=</span> <span class="ident">expected</span> {
<span class="prelude-val">Ok</span>(())
} <span class="kw">else</span> {
<span class="prelude-val">Err</span>(<span class="string">"Checksum mismatch!"</span>.<span class="ident">to_owned</span>())
}
},
}
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">current_value</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">u32</span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">checksum_type</span> {
<span class="ident">ChecksumType::Adler32</span>(<span class="kw-2">ref</span> <span class="ident">c</span>) <span class="op">=</span><span class="op">></span> <span class="ident">c</span>.<span class="ident">hash</span>(),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="number">0</span>,
}
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">test</span> {
<span class="kw">use</span> <span class="kw">super</span><span class="ident">::adler32_from_bytes</span>;
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">adler32</span>() {
<span class="kw">let</span> <span class="ident">bytes</span> <span class="op">=</span> [<span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x01</span>, <span class="number">0x0b</span>];
<span class="macro">assert_eq!</span>(<span class="ident">adler32_from_bytes</span>(<span class="kw-2">&</span><span class="ident">bytes</span>), <span class="number">267</span>);
}
}
</pre></div>
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