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</pre><pre class="rust">
<span class="comment">// Table B.1</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Marker</span> {
<span class="doccomment">/// Start Of Frame markers</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - SOF(0): Baseline DCT (Huffman coding)</span>
<span class="doccomment">/// - SOF(1): Extended sequential DCT (Huffman coding)</span>
<span class="doccomment">/// - SOF(2): Progressive DCT (Huffman coding)</span>
<span class="doccomment">/// - SOF(3): Lossless (sequential) (Huffman coding)</span>
<span class="doccomment">/// - SOF(5): Differential sequential DCT (Huffman coding)</span>
<span class="doccomment">/// - SOF(6): Differential progressive DCT (Huffman coding)</span>
<span class="doccomment">/// - SOF(7): Differential lossless (sequential) (Huffman coding)</span>
<span class="doccomment">/// - SOF(9): Extended sequential DCT (arithmetic coding)</span>
<span class="doccomment">/// - SOF(10): Progressive DCT (arithmetic coding)</span>
<span class="doccomment">/// - SOF(11): Lossless (sequential) (arithmetic coding)</span>
<span class="doccomment">/// - SOF(13): Differential sequential DCT (arithmetic coding)</span>
<span class="doccomment">/// - SOF(14): Differential progressive DCT (arithmetic coding)</span>
<span class="doccomment">/// - SOF(15): Differential lossless (sequential) (arithmetic coding)</span>
<span class="ident">SOF</span>(<span class="ident">u8</span>),
<span class="doccomment">/// Reserved for JPEG extensions</span>
<span class="ident">JPG</span>,
<span class="doccomment">/// Define Huffman table(s)</span>
<span class="ident">DHT</span>,
<span class="doccomment">/// Define arithmetic coding conditioning(s)</span>
<span class="ident">DAC</span>,
<span class="doccomment">/// Restart with modulo 8 count `m`</span>
<span class="ident">RST</span>(<span class="ident">u8</span>),
<span class="doccomment">/// Start of image</span>
<span class="ident">SOI</span>,
<span class="doccomment">/// End of image</span>
<span class="ident">EOI</span>,
<span class="doccomment">/// Start of scan</span>
<span class="ident">SOS</span>,
<span class="doccomment">/// Define quantization table(s)</span>
<span class="ident">DQT</span>,
<span class="doccomment">/// Define number of lines</span>
<span class="ident">DNL</span>,
<span class="doccomment">/// Define restart interval</span>
<span class="ident">DRI</span>,
<span class="doccomment">/// Define hierarchical progression</span>
<span class="ident">DHP</span>,
<span class="doccomment">/// Expand reference component(s)</span>
<span class="ident">EXP</span>,
<span class="doccomment">/// Reserved for application segments</span>
<span class="ident">APP</span>(<span class="ident">u8</span>),
<span class="doccomment">/// Reserved for JPEG extensions</span>
<span class="ident">JPGn</span>(<span class="ident">u8</span>),
<span class="doccomment">/// Comment</span>
<span class="ident">COM</span>,
<span class="doccomment">/// For temporary private use in arithmetic coding</span>
<span class="ident">TEM</span>,
<span class="doccomment">/// Reserved</span>
<span class="ident">RES</span>,
}
<span class="kw">impl</span> <span class="ident">Marker</span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">has_length</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">use</span> <span class="self">self</span><span class="ident">::Marker</span>::<span class="kw-2">*</span>;
<span class="kw">match</span> <span class="self">self</span> {
<span class="ident">RST</span>(..) <span class="op">|</span> <span class="ident">SOI</span> <span class="op">|</span> <span class="ident">EOI</span> <span class="op">|</span> <span class="ident">TEM</span> <span class="op">=</span><span class="op">></span> <span class="bool-val">false</span>,
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="bool-val">true</span>,
}
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_u8</span>(<span class="ident">n</span>: <span class="ident">u8</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Marker</span><span class="op">></span> {
<span class="kw">use</span> <span class="self">self</span><span class="ident">::Marker</span>::<span class="kw-2">*</span>;
<span class="kw">match</span> <span class="ident">n</span> {
<span class="number">0x00</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>, <span class="comment">// Byte stuffing</span>
<span class="number">0x01</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">TEM</span>),
<span class="number">0x02</span> ..<span class="op">=</span> <span class="number">0xBF</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">RES</span>),
<span class="number">0xC0</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">SOF</span>(<span class="number">0</span>)),
<span class="number">0xC1</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">SOF</span>(<span class="number">1</span>)),
<span class="number">0xC2</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">SOF</span>(<span class="number">2</span>)),
<span class="number">0xC3</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">SOF</span>(<span class="number">3</span>)),
<span class="number">0xC4</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">DHT</span>),
<span class="number">0xC5</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">SOF</span>(<span class="number">5</span>)),
<span class="number">0xC6</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">SOF</span>(<span class="number">6</span>)),
<span class="number">0xC7</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">SOF</span>(<span class="number">7</span>)),
<span class="number">0xC8</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">JPG</span>),
<span class="number">0xC9</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">SOF</span>(<span class="number">9</span>)),
<span class="number">0xCA</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">SOF</span>(<span class="number">10</span>)),
<span class="number">0xCB</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">SOF</span>(<span class="number">11</span>)),
<span class="number">0xCC</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">DAC</span>),
<span class="number">0xCD</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">SOF</span>(<span class="number">13</span>)),
<span class="number">0xCE</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">SOF</span>(<span class="number">14</span>)),
<span class="number">0xCF</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">SOF</span>(<span class="number">15</span>)),
<span class="number">0xD0</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">RST</span>(<span class="number">0</span>)),
<span class="number">0xD1</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">RST</span>(<span class="number">1</span>)),
<span class="number">0xD2</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">RST</span>(<span class="number">2</span>)),
<span class="number">0xD3</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">RST</span>(<span class="number">3</span>)),
<span class="number">0xD4</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">RST</span>(<span class="number">4</span>)),
<span class="number">0xD5</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">RST</span>(<span class="number">5</span>)),
<span class="number">0xD6</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">RST</span>(<span class="number">6</span>)),
<span class="number">0xD7</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">RST</span>(<span class="number">7</span>)),
<span class="number">0xD8</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">SOI</span>),
<span class="number">0xD9</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">EOI</span>),
<span class="number">0xDA</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">SOS</span>),
<span class="number">0xDB</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">DQT</span>),
<span class="number">0xDC</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">DNL</span>),
<span class="number">0xDD</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">DRI</span>),
<span class="number">0xDE</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">DHP</span>),
<span class="number">0xDF</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">EXP</span>),
<span class="number">0xE0</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">APP</span>(<span class="number">0</span>)),
<span class="number">0xE1</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">APP</span>(<span class="number">1</span>)),
<span class="number">0xE2</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">APP</span>(<span class="number">2</span>)),
<span class="number">0xE3</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">APP</span>(<span class="number">3</span>)),
<span class="number">0xE4</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">APP</span>(<span class="number">4</span>)),
<span class="number">0xE5</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">APP</span>(<span class="number">5</span>)),
<span class="number">0xE6</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">APP</span>(<span class="number">6</span>)),
<span class="number">0xE7</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">APP</span>(<span class="number">7</span>)),
<span class="number">0xE8</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">APP</span>(<span class="number">8</span>)),
<span class="number">0xE9</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">APP</span>(<span class="number">9</span>)),
<span class="number">0xEA</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">APP</span>(<span class="number">10</span>)),
<span class="number">0xEB</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">APP</span>(<span class="number">11</span>)),
<span class="number">0xEC</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">APP</span>(<span class="number">12</span>)),
<span class="number">0xED</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">APP</span>(<span class="number">13</span>)),
<span class="number">0xEE</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">APP</span>(<span class="number">14</span>)),
<span class="number">0xEF</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">APP</span>(<span class="number">15</span>)),
<span class="number">0xF0</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">JPGn</span>(<span class="number">0</span>)),
<span class="number">0xF1</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">JPGn</span>(<span class="number">1</span>)),
<span class="number">0xF2</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">JPGn</span>(<span class="number">2</span>)),
<span class="number">0xF3</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">JPGn</span>(<span class="number">3</span>)),
<span class="number">0xF4</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">JPGn</span>(<span class="number">4</span>)),
<span class="number">0xF5</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">JPGn</span>(<span class="number">5</span>)),
<span class="number">0xF6</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">JPGn</span>(<span class="number">6</span>)),
<span class="number">0xF7</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">JPGn</span>(<span class="number">7</span>)),
<span class="number">0xF8</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">JPGn</span>(<span class="number">8</span>)),
<span class="number">0xF9</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">JPGn</span>(<span class="number">9</span>)),
<span class="number">0xFA</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">JPGn</span>(<span class="number">10</span>)),
<span class="number">0xFB</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">JPGn</span>(<span class="number">11</span>)),
<span class="number">0xFC</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">JPGn</span>(<span class="number">12</span>)),
<span class="number">0xFD</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">JPGn</span>(<span class="number">13</span>)),
<span class="number">0xFE</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">COM</span>),
<span class="number">0xFF</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>, <span class="comment">// Fill byte</span>
}
}
}
</pre></div>
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