<!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/png-0.11.0/src/crc.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>crc.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">const</span> <span class="ident">CRC_TABLE</span>: [<span class="ident">u32</span>; <span class="number">256</span>] <span class="op">=</span> [
<span class="number">0x00000000</span>, <span class="number">0x77073096</span>, <span class="number">0xee0e612c</span>, <span class="number">0x990951ba</span>, <span class="number">0x076dc419</span>,
<span class="number">0x706af48f</span>, <span class="number">0xe963a535</span>, <span class="number">0x9e6495a3</span>, <span class="number">0x0edb8832</span>, <span class="number">0x79dcb8a4</span>,
<span class="number">0xe0d5e91e</span>, <span class="number">0x97d2d988</span>, <span class="number">0x09b64c2b</span>, <span class="number">0x7eb17cbd</span>, <span class="number">0xe7b82d07</span>,
<span class="number">0x90bf1d91</span>, <span class="number">0x1db71064</span>, <span class="number">0x6ab020f2</span>, <span class="number">0xf3b97148</span>, <span class="number">0x84be41de</span>,
<span class="number">0x1adad47d</span>, <span class="number">0x6ddde4eb</span>, <span class="number">0xf4d4b551</span>, <span class="number">0x83d385c7</span>, <span class="number">0x136c9856</span>,
<span class="number">0x646ba8c0</span>, <span class="number">0xfd62f97a</span>, <span class="number">0x8a65c9ec</span>, <span class="number">0x14015c4f</span>, <span class="number">0x63066cd9</span>,
<span class="number">0xfa0f3d63</span>, <span class="number">0x8d080df5</span>, <span class="number">0x3b6e20c8</span>, <span class="number">0x4c69105e</span>, <span class="number">0xd56041e4</span>,
<span class="number">0xa2677172</span>, <span class="number">0x3c03e4d1</span>, <span class="number">0x4b04d447</span>, <span class="number">0xd20d85fd</span>, <span class="number">0xa50ab56b</span>,
<span class="number">0x35b5a8fa</span>, <span class="number">0x42b2986c</span>, <span class="number">0xdbbbc9d6</span>, <span class="number">0xacbcf940</span>, <span class="number">0x32d86ce3</span>,
<span class="number">0x45df5c75</span>, <span class="number">0xdcd60dcf</span>, <span class="number">0xabd13d59</span>, <span class="number">0x26d930ac</span>, <span class="number">0x51de003a</span>,
<span class="number">0xc8d75180</span>, <span class="number">0xbfd06116</span>, <span class="number">0x21b4f4b5</span>, <span class="number">0x56b3c423</span>, <span class="number">0xcfba9599</span>,
<span class="number">0xb8bda50f</span>, <span class="number">0x2802b89e</span>, <span class="number">0x5f058808</span>, <span class="number">0xc60cd9b2</span>, <span class="number">0xb10be924</span>,
<span class="number">0x2f6f7c87</span>, <span class="number">0x58684c11</span>, <span class="number">0xc1611dab</span>, <span class="number">0xb6662d3d</span>, <span class="number">0x76dc4190</span>,
<span class="number">0x01db7106</span>, <span class="number">0x98d220bc</span>, <span class="number">0xefd5102a</span>, <span class="number">0x71b18589</span>, <span class="number">0x06b6b51f</span>,
<span class="number">0x9fbfe4a5</span>, <span class="number">0xe8b8d433</span>, <span class="number">0x7807c9a2</span>, <span class="number">0x0f00f934</span>, <span class="number">0x9609a88e</span>,
<span class="number">0xe10e9818</span>, <span class="number">0x7f6a0dbb</span>, <span class="number">0x086d3d2d</span>, <span class="number">0x91646c97</span>, <span class="number">0xe6635c01</span>,
<span class="number">0x6b6b51f4</span>, <span class="number">0x1c6c6162</span>, <span class="number">0x856530d8</span>, <span class="number">0xf262004e</span>, <span class="number">0x6c0695ed</span>,
<span class="number">0x1b01a57b</span>, <span class="number">0x8208f4c1</span>, <span class="number">0xf50fc457</span>, <span class="number">0x65b0d9c6</span>, <span class="number">0x12b7e950</span>,
<span class="number">0x8bbeb8ea</span>, <span class="number">0xfcb9887c</span>, <span class="number">0x62dd1ddf</span>, <span class="number">0x15da2d49</span>, <span class="number">0x8cd37cf3</span>,
<span class="number">0xfbd44c65</span>, <span class="number">0x4db26158</span>, <span class="number">0x3ab551ce</span>, <span class="number">0xa3bc0074</span>, <span class="number">0xd4bb30e2</span>,
<span class="number">0x4adfa541</span>, <span class="number">0x3dd895d7</span>, <span class="number">0xa4d1c46d</span>, <span class="number">0xd3d6f4fb</span>, <span class="number">0x4369e96a</span>,
<span class="number">0x346ed9fc</span>, <span class="number">0xad678846</span>, <span class="number">0xda60b8d0</span>, <span class="number">0x44042d73</span>, <span class="number">0x33031de5</span>,
<span class="number">0xaa0a4c5f</span>, <span class="number">0xdd0d7cc9</span>, <span class="number">0x5005713c</span>, <span class="number">0x270241aa</span>, <span class="number">0xbe0b1010</span>,
<span class="number">0xc90c2086</span>, <span class="number">0x5768b525</span>, <span class="number">0x206f85b3</span>, <span class="number">0xb966d409</span>, <span class="number">0xce61e49f</span>,
<span class="number">0x5edef90e</span>, <span class="number">0x29d9c998</span>, <span class="number">0xb0d09822</span>, <span class="number">0xc7d7a8b4</span>, <span class="number">0x59b33d17</span>,
<span class="number">0x2eb40d81</span>, <span class="number">0xb7bd5c3b</span>, <span class="number">0xc0ba6cad</span>, <span class="number">0xedb88320</span>, <span class="number">0x9abfb3b6</span>,
<span class="number">0x03b6e20c</span>, <span class="number">0x74b1d29a</span>, <span class="number">0xead54739</span>, <span class="number">0x9dd277af</span>, <span class="number">0x04db2615</span>,
<span class="number">0x73dc1683</span>, <span class="number">0xe3630b12</span>, <span class="number">0x94643b84</span>, <span class="number">0x0d6d6a3e</span>, <span class="number">0x7a6a5aa8</span>,
<span class="number">0xe40ecf0b</span>, <span class="number">0x9309ff9d</span>, <span class="number">0x0a00ae27</span>, <span class="number">0x7d079eb1</span>, <span class="number">0xf00f9344</span>,
<span class="number">0x8708a3d2</span>, <span class="number">0x1e01f268</span>, <span class="number">0x6906c2fe</span>, <span class="number">0xf762575d</span>, <span class="number">0x806567cb</span>,
<span class="number">0x196c3671</span>, <span class="number">0x6e6b06e7</span>, <span class="number">0xfed41b76</span>, <span class="number">0x89d32be0</span>, <span class="number">0x10da7a5a</span>,
<span class="number">0x67dd4acc</span>, <span class="number">0xf9b9df6f</span>, <span class="number">0x8ebeeff9</span>, <span class="number">0x17b7be43</span>, <span class="number">0x60b08ed5</span>,
<span class="number">0xd6d6a3e8</span>, <span class="number">0xa1d1937e</span>, <span class="number">0x38d8c2c4</span>, <span class="number">0x4fdff252</span>, <span class="number">0xd1bb67f1</span>,
<span class="number">0xa6bc5767</span>, <span class="number">0x3fb506dd</span>, <span class="number">0x48b2364b</span>, <span class="number">0xd80d2bda</span>, <span class="number">0xaf0a1b4c</span>,
<span class="number">0x36034af6</span>, <span class="number">0x41047a60</span>, <span class="number">0xdf60efc3</span>, <span class="number">0xa867df55</span>, <span class="number">0x316e8eef</span>,
<span class="number">0x4669be79</span>, <span class="number">0xcb61b38c</span>, <span class="number">0xbc66831a</span>, <span class="number">0x256fd2a0</span>, <span class="number">0x5268e236</span>,
<span class="number">0xcc0c7795</span>, <span class="number">0xbb0b4703</span>, <span class="number">0x220216b9</span>, <span class="number">0x5505262f</span>, <span class="number">0xc5ba3bbe</span>,
<span class="number">0xb2bd0b28</span>, <span class="number">0x2bb45a92</span>, <span class="number">0x5cb36a04</span>, <span class="number">0xc2d7ffa7</span>, <span class="number">0xb5d0cf31</span>,
<span class="number">0x2cd99e8b</span>, <span class="number">0x5bdeae1d</span>, <span class="number">0x9b64c2b0</span>, <span class="number">0xec63f226</span>, <span class="number">0x756aa39c</span>,
<span class="number">0x026d930a</span>, <span class="number">0x9c0906a9</span>, <span class="number">0xeb0e363f</span>, <span class="number">0x72076785</span>, <span class="number">0x05005713</span>,
<span class="number">0x95bf4a82</span>, <span class="number">0xe2b87a14</span>, <span class="number">0x7bb12bae</span>, <span class="number">0x0cb61b38</span>, <span class="number">0x92d28e9b</span>,
<span class="number">0xe5d5be0d</span>, <span class="number">0x7cdcefb7</span>, <span class="number">0x0bdbdf21</span>, <span class="number">0x86d3d2d4</span>, <span class="number">0xf1d4e242</span>,
<span class="number">0x68ddb3f8</span>, <span class="number">0x1fda836e</span>, <span class="number">0x81be16cd</span>, <span class="number">0xf6b9265b</span>, <span class="number">0x6fb077e1</span>,
<span class="number">0x18b74777</span>, <span class="number">0x88085ae6</span>, <span class="number">0xff0f6a70</span>, <span class="number">0x66063bca</span>, <span class="number">0x11010b5c</span>,
<span class="number">0x8f659eff</span>, <span class="number">0xf862ae69</span>, <span class="number">0x616bffd3</span>, <span class="number">0x166ccf45</span>, <span class="number">0xa00ae278</span>,
<span class="number">0xd70dd2ee</span>, <span class="number">0x4e048354</span>, <span class="number">0x3903b3c2</span>, <span class="number">0xa7672661</span>, <span class="number">0xd06016f7</span>,
<span class="number">0x4969474d</span>, <span class="number">0x3e6e77db</span>, <span class="number">0xaed16a4a</span>, <span class="number">0xd9d65adc</span>, <span class="number">0x40df0b66</span>,
<span class="number">0x37d83bf0</span>, <span class="number">0xa9bcae53</span>, <span class="number">0xdebb9ec5</span>, <span class="number">0x47b2cf7f</span>, <span class="number">0x30b5ffe9</span>,
<span class="number">0xbdbdf21c</span>, <span class="number">0xcabac28a</span>, <span class="number">0x53b39330</span>, <span class="number">0x24b4a3a6</span>, <span class="number">0xbad03605</span>,
<span class="number">0xcdd70693</span>, <span class="number">0x54de5729</span>, <span class="number">0x23d967bf</span>, <span class="number">0xb3667a2e</span>, <span class="number">0xc4614ab8</span>,
<span class="number">0x5d681b02</span>, <span class="number">0x2a6f2b94</span>, <span class="number">0xb40bbe37</span>, <span class="number">0xc30c8ea1</span>, <span class="number">0x5a05df1b</span>,
<span class="number">0x2d02ef8d</span>
];
<span class="doccomment">/// Crc-32 checksum calculation</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Crc32</span> {
<span class="ident">crc</span>: <span class="ident">u32</span>,
}
<span class="kw">impl</span> <span class="ident">Crc32</span> {
<span class="doccomment">/// Create a new hasher.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">></span> <span class="ident">Crc32</span> {
<span class="ident">Crc32</span> {<span class="ident">crc</span>: <span class="number">0xFFFFFFFF</span>}
}
<span class="doccomment">/// Resets the hasher.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">reset</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="self">Self</span><span class="ident">::new</span>()
}
<span class="doccomment">/// Update the internal hasher with the bytes from ```buf```</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">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) {
<span class="kw">for</span> <span class="kw-2">&</span><span class="ident">byte</span> <span class="kw">in</span> <span class="ident">buf</span> {
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> (<span class="self">self</span>.<span class="ident">crc</span> <span class="op">^</span> <span class="ident">byte</span> <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">&</span> <span class="number">0xFF</span>;
<span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">crc</span> <span class="op">></span><span class="op">></span> <span class="number">8</span>;
<span class="self">self</span>.<span class="ident">crc</span> <span class="op">=</span> <span class="ident">CRC_TABLE</span>[<span class="ident">a</span> <span class="kw">as</span> <span class="ident">usize</span>] <span class="op">^</span> <span class="ident">b</span>;
}
}
<span class="doccomment">/// Return the computed hash.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">checksum</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="self">self</span>.<span class="ident">crc</span> <span class="op">^</span> <span class="number">0xFFFFFFFF</span>
}
}
</pre></div>
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