<!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 to the Rust file `/home/mrh/.cargo/registry/src/github.com-1ecc6299db9ec823/image-0.21.2/./src/pnm/decoder.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>decoder.rs.html -- 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="../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../light.css" id="themeStyle"><script src="../../../storage.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="shortcut icon" href="../../../favicon.ico"><style type="text/css">#crate-search{background-image:url("../../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../../image/index.html'><div class='logo-container'><img src='../../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../../settings.html"><img src="../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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<span id="978"> 978</span>
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<span id="990"> 990</span>
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<span id="992"> 992</span>
<span id="993"> 993</span>
<span id="994"> 994</span>
<span id="995"> 995</span>
<span id="996"> 996</span>
<span id="997"> 997</span>
<span id="998"> 998</span>
<span id="999"> 999</span>
<span id="1000">1000</span>
<span id="1001">1001</span>
<span id="1002">1002</span>
<span id="1003">1003</span>
<span id="1004">1004</span>
<span id="1005">1005</span>
<span id="1006">1006</span>
<span id="1007">1007</span>
<span id="1008">1008</span>
<span id="1009">1009</span>
<span id="1010">1010</span>
<span id="1011">1011</span>
<span id="1012">1012</span>
<span id="1013">1013</span>
<span id="1014">1014</span>
<span id="1015">1015</span>
<span id="1016">1016</span>
<span id="1017">1017</span>
<span id="1018">1018</span>
<span id="1019">1019</span>
<span id="1020">1020</span>
<span id="1021">1021</span>
<span id="1022">1022</span>
<span id="1023">1023</span>
<span id="1024">1024</span>
<span id="1025">1025</span>
<span id="1026">1026</span>
<span id="1027">1027</span>
<span id="1028">1028</span>
<span id="1029">1029</span>
<span id="1030">1030</span>
<span id="1031">1031</span>
<span id="1032">1032</span>
<span id="1033">1033</span>
<span id="1034">1034</span>
<span id="1035">1035</span>
<span id="1036">1036</span>
</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="self">self</span>, <span class="ident">BufRead</span>, <span class="ident">BufReader</span>, <span class="ident">Cursor</span>, <span class="ident">Read</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">str</span>::{<span class="self">self</span>, <span class="ident">FromStr</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>::<span class="ident">Display</span>;
<span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">ArbitraryHeader</span>, <span class="ident">ArbitraryTuplType</span>, <span class="ident">BitmapHeader</span>, <span class="ident">GraymapHeader</span>, <span class="ident">PixmapHeader</span>};
<span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">HeaderRecord</span>, <span class="ident">PNMHeader</span>, <span class="ident">PNMSubtype</span>, <span class="ident">SampleEncoding</span>};
<span class="kw">use</span> <span class="ident">color</span>::<span class="ident">ColorType</span>;
<span class="kw">use</span> <span class="ident">image</span>::{<span class="ident">ImageDecoder</span>, <span class="ident">ImageError</span>, <span class="ident">ImageResult</span>};
<span class="kw">use</span> <span class="ident">byteorder</span>::{<span class="ident">BigEndian</span>, <span class="ident">ByteOrder</span>, <span class="ident">NativeEndian</span>};
<span class="doccomment">/// Dynamic representation, represents all decodable (sample, depth) combinations.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>)]</span>
<span class="kw">enum</span> <span class="ident">TupleType</span> {
<span class="ident">PbmBit</span>,
<span class="ident">BWBit</span>,
<span class="ident">GrayU8</span>,
<span class="ident">GrayU16</span>,
<span class="ident">RGBU8</span>,
<span class="ident">RGBU16</span>,
}
<span class="kw">trait</span> <span class="ident">Sample</span> {
<span class="kw">fn</span> <span class="ident">bytelen</span>(<span class="ident">width</span>: <span class="ident">u32</span>, <span class="ident">height</span>: <span class="ident">u32</span>, <span class="ident">samples</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>;
<span class="doccomment">/// It is guaranteed that `bytes.len() == bytelen(width, height, samples)`</span>
<span class="kw">fn</span> <span class="ident">from_bytes</span>(<span class="ident">bytes</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>], <span class="ident">width</span>: <span class="ident">u32</span>, <span class="ident">height</span>: <span class="ident">u32</span>, <span class="ident">samples</span>: <span class="ident">u32</span>)
<span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</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">fn</span> <span class="ident">from_ascii</span>(<span class="ident">reader</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Read</span>, <span class="ident">width</span>: <span class="ident">u32</span>, <span class="ident">height</span>: <span class="ident">u32</span>, <span class="ident">samples</span>: <span class="ident">u32</span>)
<span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</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">struct</span> <span class="ident">U8</span>;
<span class="kw">struct</span> <span class="ident">U16</span>;
<span class="kw">struct</span> <span class="ident">PbmBit</span>;
<span class="kw">struct</span> <span class="ident">BWBit</span>;
<span class="kw">trait</span> <span class="ident">DecodableImageHeader</span> {
<span class="kw">fn</span> <span class="ident">tuple_type</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">TupleType</span><span class="op">></span>;
}
<span class="doccomment">/// PNM decoder</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">PNMDecoder</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="ident">reader</span>: <span class="ident">BufReader</span><span class="op"><</span><span class="ident">R</span><span class="op">></span>,
<span class="ident">header</span>: <span class="ident">PNMHeader</span>,
<span class="ident">tuple</span>: <span class="ident">TupleType</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Read</span><span class="op">></span> <span class="ident">PNMDecoder</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="doccomment">/// Create a new decoder that decodes from the stream ```read```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">read</span>: <span class="ident">R</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">PNMDecoder</span><span class="op"><</span><span class="ident">R</span><span class="op">></span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">BufReader</span>::<span class="ident">new</span>(<span class="ident">read</span>);
<span class="kw">let</span> <span class="ident">magic</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">read_magic_constant</span>()<span class="question-mark">?</span>;
<span class="kw">if</span> <span class="ident">magic</span>[<span class="number">0</span>] <span class="op">!</span><span class="op">=</span> <span class="string">b'P'</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="macro">format</span><span class="macro">!</span>(<span class="string">"Expected magic constant for pnm, P1 through P7 instead of {:?}"</span>, <span class="ident">magic</span>),
));
}
<span class="kw">let</span> <span class="ident">subtype</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">magic</span>[<span class="number">1</span>] {
<span class="string">b'1'</span> <span class="op">=</span><span class="op">></span> <span class="ident">PNMSubtype</span>::<span class="ident">Bitmap</span>(<span class="ident">SampleEncoding</span>::<span class="ident">Ascii</span>),
<span class="string">b'2'</span> <span class="op">=</span><span class="op">></span> <span class="ident">PNMSubtype</span>::<span class="ident">Graymap</span>(<span class="ident">SampleEncoding</span>::<span class="ident">Ascii</span>),
<span class="string">b'3'</span> <span class="op">=</span><span class="op">></span> <span class="ident">PNMSubtype</span>::<span class="ident">Pixmap</span>(<span class="ident">SampleEncoding</span>::<span class="ident">Ascii</span>),
<span class="string">b'4'</span> <span class="op">=</span><span class="op">></span> <span class="ident">PNMSubtype</span>::<span class="ident">Bitmap</span>(<span class="ident">SampleEncoding</span>::<span class="ident">Binary</span>),
<span class="string">b'5'</span> <span class="op">=</span><span class="op">></span> <span class="ident">PNMSubtype</span>::<span class="ident">Graymap</span>(<span class="ident">SampleEncoding</span>::<span class="ident">Binary</span>),
<span class="string">b'6'</span> <span class="op">=</span><span class="op">></span> <span class="ident">PNMSubtype</span>::<span class="ident">Pixmap</span>(<span class="ident">SampleEncoding</span>::<span class="ident">Binary</span>),
<span class="string">b'7'</span> <span class="op">=</span><span class="op">></span> <span class="ident">PNMSubtype</span>::<span class="ident">ArbitraryMap</span>,
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="macro">format</span><span class="macro">!</span>(<span class="string">"Expected magic constant for pnm, P1 through P7 instead of {:?}"</span>, <span class="ident">magic</span>),
));
}
};
<span class="kw">match</span> <span class="ident">subtype</span> {
<span class="ident">PNMSubtype</span>::<span class="ident">Bitmap</span>(<span class="ident">enc</span>) <span class="op">=</span><span class="op">></span> <span class="ident">PNMDecoder</span>::<span class="ident">read_bitmap_header</span>(<span class="ident">buf</span>, <span class="ident">enc</span>),
<span class="ident">PNMSubtype</span>::<span class="ident">Graymap</span>(<span class="ident">enc</span>) <span class="op">=</span><span class="op">></span> <span class="ident">PNMDecoder</span>::<span class="ident">read_graymap_header</span>(<span class="ident">buf</span>, <span class="ident">enc</span>),
<span class="ident">PNMSubtype</span>::<span class="ident">Pixmap</span>(<span class="ident">enc</span>) <span class="op">=</span><span class="op">></span> <span class="ident">PNMDecoder</span>::<span class="ident">read_pixmap_header</span>(<span class="ident">buf</span>, <span class="ident">enc</span>),
<span class="ident">PNMSubtype</span>::<span class="ident">ArbitraryMap</span> <span class="op">=</span><span class="op">></span> <span class="ident">PNMDecoder</span>::<span class="ident">read_arbitrary_header</span>(<span class="ident">buf</span>),
}
}
<span class="doccomment">/// Extract the reader and header after an image has been read.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_inner</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> (<span class="ident">R</span>, <span class="ident">PNMHeader</span>) {
(<span class="self">self</span>.<span class="ident">reader</span>.<span class="ident">into_inner</span>(), <span class="self">self</span>.<span class="ident">header</span>)
}
<span class="kw">fn</span> <span class="ident">read_bitmap_header</span>(
<span class="kw-2">mut</span> <span class="ident">reader</span>: <span class="ident">BufReader</span><span class="op"><</span><span class="ident">R</span><span class="op">></span>,
<span class="ident">encoding</span>: <span class="ident">SampleEncoding</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">PNMDecoder</span><span class="op"><</span><span class="ident">R</span><span class="op">></span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">header</span> <span class="op">=</span> <span class="ident">reader</span>.<span class="ident">read_bitmap_header</span>(<span class="ident">encoding</span>)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">PNMDecoder</span> {
<span class="ident">reader</span>,
<span class="ident">tuple</span>: <span class="ident">TupleType</span>::<span class="ident">PbmBit</span>,
<span class="ident">header</span>: <span class="ident">PNMHeader</span> {
<span class="ident">decoded</span>: <span class="ident">HeaderRecord</span>::<span class="ident">Bitmap</span>(<span class="ident">header</span>),
<span class="ident">encoded</span>: <span class="prelude-val">None</span>,
},
})
}
<span class="kw">fn</span> <span class="ident">read_graymap_header</span>(
<span class="kw-2">mut</span> <span class="ident">reader</span>: <span class="ident">BufReader</span><span class="op"><</span><span class="ident">R</span><span class="op">></span>,
<span class="ident">encoding</span>: <span class="ident">SampleEncoding</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">PNMDecoder</span><span class="op"><</span><span class="ident">R</span><span class="op">></span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">header</span> <span class="op">=</span> <span class="ident">reader</span>.<span class="ident">read_graymap_header</span>(<span class="ident">encoding</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">tuple_type</span> <span class="op">=</span> <span class="ident">header</span>.<span class="ident">tuple_type</span>()<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">PNMDecoder</span> {
<span class="ident">reader</span>,
<span class="ident">tuple</span>: <span class="ident">tuple_type</span>,
<span class="ident">header</span>: <span class="ident">PNMHeader</span> {
<span class="ident">decoded</span>: <span class="ident">HeaderRecord</span>::<span class="ident">Graymap</span>(<span class="ident">header</span>),
<span class="ident">encoded</span>: <span class="prelude-val">None</span>,
},
})
}
<span class="kw">fn</span> <span class="ident">read_pixmap_header</span>(
<span class="kw-2">mut</span> <span class="ident">reader</span>: <span class="ident">BufReader</span><span class="op"><</span><span class="ident">R</span><span class="op">></span>,
<span class="ident">encoding</span>: <span class="ident">SampleEncoding</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">PNMDecoder</span><span class="op"><</span><span class="ident">R</span><span class="op">></span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">header</span> <span class="op">=</span> <span class="ident">reader</span>.<span class="ident">read_pixmap_header</span>(<span class="ident">encoding</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">tuple_type</span> <span class="op">=</span> <span class="ident">header</span>.<span class="ident">tuple_type</span>()<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">PNMDecoder</span> {
<span class="ident">reader</span>,
<span class="ident">tuple</span>: <span class="ident">tuple_type</span>,
<span class="ident">header</span>: <span class="ident">PNMHeader</span> {
<span class="ident">decoded</span>: <span class="ident">HeaderRecord</span>::<span class="ident">Pixmap</span>(<span class="ident">header</span>),
<span class="ident">encoded</span>: <span class="prelude-val">None</span>,
},
})
}
<span class="kw">fn</span> <span class="ident">read_arbitrary_header</span>(<span class="kw-2">mut</span> <span class="ident">reader</span>: <span class="ident">BufReader</span><span class="op"><</span><span class="ident">R</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">PNMDecoder</span><span class="op"><</span><span class="ident">R</span><span class="op">></span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">header</span> <span class="op">=</span> <span class="ident">reader</span>.<span class="ident">read_arbitrary_header</span>()<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">tuple_type</span> <span class="op">=</span> <span class="ident">header</span>.<span class="ident">tuple_type</span>()<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">PNMDecoder</span> {
<span class="ident">reader</span>,
<span class="ident">tuple</span>: <span class="ident">tuple_type</span>,
<span class="ident">header</span>: <span class="ident">PNMHeader</span> {
<span class="ident">decoded</span>: <span class="ident">HeaderRecord</span>::<span class="ident">Arbitrary</span>(<span class="ident">header</span>),
<span class="ident">encoded</span>: <span class="prelude-val">None</span>,
},
})
}
}
<span class="kw">trait</span> <span class="ident">HeaderReader</span>: <span class="ident">BufRead</span> {
<span class="doccomment">/// Reads the two magic constant bytes</span>
<span class="kw">fn</span> <span class="ident">read_magic_constant</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span>[<span class="ident">u8</span>; <span class="number">2</span>]<span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">magic</span>: [<span class="ident">u8</span>; <span class="number">2</span>] <span class="op">=</span> [<span class="number">0</span>, <span class="number">0</span>];
<span class="self">self</span>.<span class="ident">read_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">magic</span>)
.<span class="ident">map_err</span>(<span class="ident">ImageError</span>::<span class="ident">IoError</span>)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">magic</span>)
}
<span class="doccomment">/// Reads a string as well as a single whitespace after it, ignoring comments</span>
<span class="kw">fn</span> <span class="ident">read_next_string</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">String</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
<span class="comment">// pair input bytes with a bool mask to remove comments</span>
<span class="kw">let</span> <span class="ident">mark_comments</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">bytes</span>().<span class="ident">scan</span>(<span class="bool-val">true</span>, <span class="op">|</span><span class="ident">partof</span>, <span class="ident">read</span><span class="op">|</span> {
<span class="kw">let</span> <span class="ident">byte</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">read</span> {
<span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Some</span>((<span class="kw-2">*</span><span class="ident">partof</span>, <span class="prelude-val">Err</span>(<span class="ident">err</span>))),
<span class="prelude-val">Ok</span>(<span class="ident">byte</span>) <span class="op">=</span><span class="op">></span> <span class="ident">byte</span>,
};
<span class="kw">let</span> <span class="ident">cur_enabled</span> <span class="op">=</span> <span class="kw-2">*</span><span class="ident">partof</span> <span class="kw-2">&</span><span class="op">&</span> <span class="ident">byte</span> <span class="op">!</span><span class="op">=</span> <span class="string">b'#'</span>;
<span class="kw">let</span> <span class="ident">next_enabled</span> <span class="op">=</span> <span class="ident">cur_enabled</span> <span class="op">|</span><span class="op">|</span> (<span class="ident">byte</span> <span class="op">=</span><span class="op">=</span> <span class="string">b'\r'</span> <span class="op">|</span><span class="op">|</span> <span class="ident">byte</span> <span class="op">=</span><span class="op">=</span> <span class="string">b'\n'</span>);
<span class="kw-2">*</span><span class="ident">partof</span> <span class="op">=</span> <span class="ident">next_enabled</span>;
<span class="prelude-val">Some</span>((<span class="ident">cur_enabled</span>, <span class="prelude-val">Ok</span>(<span class="ident">byte</span>)))
});
<span class="kw">for</span> (<span class="kw">_</span>, <span class="ident">byte</span>) <span class="kw">in</span> <span class="ident">mark_comments</span>.<span class="ident">filter</span>(<span class="op">|</span><span class="kw-2">ref</span> <span class="ident">e</span><span class="op">|</span> <span class="ident">e</span>.<span class="number">0</span>) {
<span class="kw">match</span> <span class="ident">byte</span> {
<span class="prelude-val">Ok</span>(<span class="string">b'\t'</span>) <span class="op">|</span> <span class="prelude-val">Ok</span>(<span class="string">b'\n'</span>) <span class="op">|</span> <span class="prelude-val">Ok</span>(<span class="string">b'\x0b'</span>) <span class="op">|</span> <span class="prelude-val">Ok</span>(<span class="string">b'\x0c'</span>) <span class="op">|</span> <span class="prelude-val">Ok</span>(<span class="string">b'\r'</span>) <span class="op">|</span> <span class="prelude-val">Ok</span>(<span class="string">b' '</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="op">!</span><span class="ident">bytes</span>.<span class="ident">is_empty</span>() {
<span class="kw">break</span>; <span class="comment">// We're done as we already have some content</span>
}
}
<span class="prelude-val">Ok</span>(<span class="ident">byte</span>) <span class="kw">if</span> <span class="op">!</span><span class="ident">byte</span>.<span class="ident">is_ascii</span>() <span class="op">=</span><span class="op">></span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="macro">format</span><span class="macro">!</span>(<span class="string">"Non ascii character {} in header"</span>, <span class="ident">byte</span>),
));
},
<span class="prelude-val">Ok</span>(<span class="ident">byte</span>) <span class="op">=</span><span class="op">></span> {
<span class="ident">bytes</span>.<span class="ident">push</span>(<span class="ident">byte</span>);
},
<span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="kw">break</span>,
}
}
<span class="kw">if</span> <span class="ident">bytes</span>.<span class="ident">is_empty</span>() {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">IoError</span>(<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">UnexpectedEof</span>.<span class="ident">into</span>()));
}
<span class="kw">if</span> <span class="op">!</span><span class="ident">bytes</span>.<span class="ident">as_slice</span>().<span class="ident">is_ascii</span>() {
<span class="comment">// We have only filled the buffer with characters for which `byte.is_ascii()` holds.</span>
<span class="macro">unreachable</span><span class="macro">!</span>(<span class="string">"Non ascii character should have returned sooner"</span>)
}
<span class="kw">let</span> <span class="ident">string</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from_utf8</span>(<span class="ident">bytes</span>)
<span class="comment">// We checked the precondition ourselves a few lines before, `bytes.as_slice().is_ascii()`.</span>
.<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="macro">unreachable</span><span class="macro">!</span>(<span class="string">"Only ascii characters should be decoded"</span>));
<span class="prelude-val">Ok</span>(<span class="ident">string</span>)
}
<span class="doccomment">/// Read the next line</span>
<span class="kw">fn</span> <span class="ident">read_next_line</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">String</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">String</span>::<span class="ident">new</span>();
<span class="self">self</span>.<span class="ident">read_line</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buffer</span>)
.<span class="ident">map_err</span>(<span class="ident">ImageError</span>::<span class="ident">IoError</span>)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">buffer</span>)
}
<span class="kw">fn</span> <span class="ident">read_next_u32</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">read_next_string</span>()<span class="question-mark">?</span>;
<span class="ident">s</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">u32</span><span class="op">></span>()
.<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> <span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="macro">format</span><span class="macro">!</span>(<span class="string">"Error parsing number {} in preamble: {}"</span>, <span class="ident">s</span>, <span class="ident">err</span>)
))
}
<span class="kw">fn</span> <span class="ident">read_bitmap_header</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">encoding</span>: <span class="ident">SampleEncoding</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">BitmapHeader</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">width</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">read_next_u32</span>()<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">height</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">read_next_u32</span>()<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">BitmapHeader</span> {
<span class="ident">encoding</span>,
<span class="ident">width</span>,
<span class="ident">height</span>,
})
}
<span class="kw">fn</span> <span class="ident">read_graymap_header</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">encoding</span>: <span class="ident">SampleEncoding</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">GraymapHeader</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">read_pixmap_header</span>(<span class="ident">encoding</span>).<span class="ident">map</span>(
<span class="op">|</span><span class="ident">PixmapHeader</span> {
<span class="ident">encoding</span>,
<span class="ident">width</span>,
<span class="ident">height</span>,
<span class="ident">maxval</span>,
}<span class="op">|</span> <span class="ident">GraymapHeader</span> {
<span class="ident">encoding</span>,
<span class="ident">width</span>,
<span class="ident">height</span>,
<span class="ident">maxwhite</span>: <span class="ident">maxval</span>,
},
)
}
<span class="kw">fn</span> <span class="ident">read_pixmap_header</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">encoding</span>: <span class="ident">SampleEncoding</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">PixmapHeader</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">width</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">read_next_u32</span>()<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">height</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">read_next_u32</span>()<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">maxval</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">read_next_u32</span>()<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">PixmapHeader</span> {
<span class="ident">encoding</span>,
<span class="ident">width</span>,
<span class="ident">height</span>,
<span class="ident">maxval</span>,
})
}
<span class="kw">fn</span> <span class="ident">read_arbitrary_header</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">ArbitraryHeader</span><span class="op">></span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">bytes</span>().<span class="ident">next</span>() {
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">IoError</span>(<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">UnexpectedEof</span>.<span class="ident">into</span>())),
<span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">io</span>)) <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">IoError</span>(<span class="ident">io</span>)),
<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="string">b'\n'</span>)) <span class="op">=</span><span class="op">></span> (),
<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="ident">c</span>)) <span class="op">=</span><span class="op">></span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="macro">format</span><span class="macro">!</span>(<span class="string">"Expected newline after P7 magic instead of {}"</span>, <span class="ident">c</span>),
))
}
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">line</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">height</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span> <span class="op">=</span> <span class="prelude-val">None</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">width</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span> <span class="op">=</span> <span class="prelude-val">None</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">depth</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span> <span class="op">=</span> <span class="prelude-val">None</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">maxval</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span> <span class="op">=</span> <span class="prelude-val">None</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tupltype</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">String</span><span class="op">></span> <span class="op">=</span> <span class="prelude-val">None</span>;
<span class="kw">loop</span> {
<span class="ident">line</span>.<span class="ident">truncate</span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">read_line</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">line</span>).<span class="ident">map_err</span>(<span class="ident">ImageError</span>::<span class="ident">IoError</span>)<span class="question-mark">?</span>;
<span class="kw">if</span> <span class="ident">len</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="macro">format</span><span class="macro">!</span>(<span class="string">"Unexpected end of pnm header"</span>),
))
}
<span class="kw">if</span> <span class="ident">line</span>.<span class="ident">as_bytes</span>()[<span class="number">0</span>] <span class="op">=</span><span class="op">=</span> <span class="string">b'#'</span> {
<span class="kw">continue</span>;
}
<span class="kw">if</span> <span class="op">!</span><span class="ident">line</span>.<span class="ident">is_ascii</span>() {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Only ascii characters allowed in pam header"</span>.<span class="ident">to_string</span>(),
));
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">let</span> (<span class="ident">identifier</span>, <span class="ident">rest</span>) <span class="op">=</span> <span class="ident">line</span>.<span class="ident">trim_left</span>()
.<span class="ident">split_at</span>(<span class="ident">line</span>.<span class="ident">find</span>(<span class="ident">char</span>::<span class="ident">is_whitespace</span>).<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">line</span>.<span class="ident">len</span>()));
<span class="kw">match</span> <span class="ident">identifier</span> {
<span class="string">"ENDHDR"</span> <span class="op">=</span><span class="op">></span> <span class="kw">break</span>,
<span class="string">"HEIGHT"</span> <span class="op">=</span><span class="op">></span> <span class="kw">if</span> <span class="ident">height</span>.<span class="ident">is_some</span>() {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="string">"Duplicate HEIGHT line"</span>.<span class="ident">to_string</span>()));
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="ident">h</span> <span class="op">=</span> <span class="ident">rest</span>.<span class="ident">trim</span>()
.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">u32</span><span class="op">></span>()
.<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> <span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="macro">format</span><span class="macro">!</span>(<span class="string">"Invalid height {}: {}"</span>, <span class="ident">rest</span>, <span class="ident">err</span>)
))<span class="question-mark">?</span>;
<span class="ident">height</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">h</span>);
},
<span class="string">"WIDTH"</span> <span class="op">=</span><span class="op">></span> <span class="kw">if</span> <span class="ident">width</span>.<span class="ident">is_some</span>() {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="string">"Duplicate WIDTH line"</span>.<span class="ident">to_string</span>()));
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="ident">w</span> <span class="op">=</span> <span class="ident">rest</span>.<span class="ident">trim</span>()
.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">u32</span><span class="op">></span>()
.<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> <span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="macro">format</span><span class="macro">!</span>(<span class="string">"Invalid width {}: {}"</span>, <span class="ident">rest</span>, <span class="ident">err</span>)
))<span class="question-mark">?</span>;
<span class="ident">width</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">w</span>);
},
<span class="string">"DEPTH"</span> <span class="op">=</span><span class="op">></span> <span class="kw">if</span> <span class="ident">depth</span>.<span class="ident">is_some</span>() {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="string">"Duplicate DEPTH line"</span>.<span class="ident">to_string</span>()));
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">rest</span>.<span class="ident">trim</span>()
.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">u32</span><span class="op">></span>()
.<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> <span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="macro">format</span><span class="macro">!</span>(<span class="string">"Invalid depth {}: {}"</span>, <span class="ident">rest</span>, <span class="ident">err</span>)
))<span class="question-mark">?</span>;
<span class="ident">depth</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">d</span>);
},
<span class="string">"MAXVAL"</span> <span class="op">=</span><span class="op">></span> <span class="kw">if</span> <span class="ident">maxval</span>.<span class="ident">is_some</span>() {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="string">"Duplicate MAXVAL line"</span>.<span class="ident">to_string</span>()));
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">rest</span>.<span class="ident">trim</span>()
.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">u32</span><span class="op">></span>()
.<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> <span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="macro">format</span><span class="macro">!</span>(<span class="string">"Invalid maxval {}: {}"</span>, <span class="ident">rest</span>, <span class="ident">err</span>)
))<span class="question-mark">?</span>;
<span class="ident">maxval</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">m</span>);
},
<span class="string">"TUPLTYPE"</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">identifier</span> <span class="op">=</span> <span class="ident">rest</span>.<span class="ident">trim</span>();
<span class="kw">if</span> <span class="ident">tupltype</span>.<span class="ident">is_some</span>() {
<span class="kw">let</span> <span class="ident">appended</span> <span class="op">=</span> <span class="ident">tupltype</span>.<span class="ident">take</span>().<span class="ident">map</span>(<span class="op">|</span><span class="kw-2">mut</span> <span class="ident">v</span><span class="op">|</span> {
<span class="ident">v</span>.<span class="ident">push</span>(<span class="string">' '</span>);
<span class="ident">v</span>.<span class="ident">push_str</span>(<span class="ident">identifier</span>);
<span class="ident">v</span>
});
<span class="ident">tupltype</span> <span class="op">=</span> <span class="ident">appended</span>;
} <span class="kw">else</span> {
<span class="ident">tupltype</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">identifier</span>.<span class="ident">to_string</span>());
}
}
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="string">"Unknown header line"</span>.<span class="ident">to_string</span>())),
}
}
<span class="kw">let</span> (<span class="ident">h</span>, <span class="ident">w</span>, <span class="ident">d</span>, <span class="ident">m</span>) <span class="op">=</span> <span class="kw">match</span> (<span class="ident">height</span>, <span class="ident">width</span>, <span class="ident">depth</span>, <span class="ident">maxval</span>) {
(<span class="prelude-val">None</span>, <span class="kw">_</span>, <span class="kw">_</span>, <span class="kw">_</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Expected one HEIGHT line"</span>.<span class="ident">to_string</span>(),
))
}
(<span class="kw">_</span>, <span class="prelude-val">None</span>, <span class="kw">_</span>, <span class="kw">_</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Expected one WIDTH line"</span>.<span class="ident">to_string</span>(),
))
}
(<span class="kw">_</span>, <span class="kw">_</span>, <span class="prelude-val">None</span>, <span class="kw">_</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Expected one DEPTH line"</span>.<span class="ident">to_string</span>(),
))
}
(<span class="kw">_</span>, <span class="kw">_</span>, <span class="kw">_</span>, <span class="prelude-val">None</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Expected one MAXVAL line"</span>.<span class="ident">to_string</span>(),
))
}
(<span class="prelude-val">Some</span>(<span class="ident">h</span>), <span class="prelude-val">Some</span>(<span class="ident">w</span>), <span class="prelude-val">Some</span>(<span class="ident">d</span>), <span class="prelude-val">Some</span>(<span class="ident">m</span>)) <span class="op">=</span><span class="op">></span> (<span class="ident">h</span>, <span class="ident">w</span>, <span class="ident">d</span>, <span class="ident">m</span>),
};
<span class="kw">let</span> <span class="ident">tupltype</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">tupltype</span> {
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
<span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">t</span>) <span class="kw">if</span> <span class="ident">t</span> <span class="op">=</span><span class="op">=</span> <span class="string">"BLACKANDWHITE"</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">BlackAndWhite</span>),
<span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">t</span>) <span class="kw">if</span> <span class="ident">t</span> <span class="op">=</span><span class="op">=</span> <span class="string">"BLACKANDWHITE_ALPHA"</span> <span class="op">=</span><span class="op">></span> {
<span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">BlackAndWhiteAlpha</span>)
}
<span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">t</span>) <span class="kw">if</span> <span class="ident">t</span> <span class="op">=</span><span class="op">=</span> <span class="string">"GRAYSCALE"</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">Grayscale</span>),
<span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">t</span>) <span class="kw">if</span> <span class="ident">t</span> <span class="op">=</span><span class="op">=</span> <span class="string">"GRAYSCALE_ALPHA"</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">GrayscaleAlpha</span>),
<span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">t</span>) <span class="kw">if</span> <span class="ident">t</span> <span class="op">=</span><span class="op">=</span> <span class="string">"RGB"</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">RGB</span>),
<span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">t</span>) <span class="kw">if</span> <span class="ident">t</span> <span class="op">=</span><span class="op">=</span> <span class="string">"RGB_ALPHA"</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">RGBAlpha</span>),
<span class="prelude-val">Some</span>(<span class="ident">other</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">Custom</span>(<span class="ident">other</span>)),
};
<span class="prelude-val">Ok</span>(<span class="ident">ArbitraryHeader</span> {
<span class="ident">height</span>: <span class="ident">h</span>,
<span class="ident">width</span>: <span class="ident">w</span>,
<span class="ident">depth</span>: <span class="ident">d</span>,
<span class="ident">maxval</span>: <span class="ident">m</span>,
<span class="ident">tupltype</span>,
})
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Read</span><span class="op">></span> <span class="ident">HeaderReader</span> <span class="kw">for</span> <span class="ident">BufReader</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {}
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Read</span><span class="op">></span> <span class="ident">ImageDecoder</span> <span class="kw">for</span> <span class="ident">PNMDecoder</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Reader</span> <span class="op">=</span> <span class="ident">Cursor</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">fn</span> <span class="ident">dimensions</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> (<span class="ident">u64</span>, <span class="ident">u64</span>) {
(<span class="self">self</span>.<span class="ident">header</span>.<span class="ident">width</span>() <span class="kw">as</span> <span class="ident">u64</span>, <span class="self">self</span>.<span class="ident">header</span>.<span class="ident">height</span>() <span class="kw">as</span> <span class="ident">u64</span>)
}
<span class="kw">fn</span> <span class="ident">colortype</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ColorType</span> {
<span class="self">self</span>.<span class="ident">tuple</span>.<span class="ident">color</span>()
}
<span class="kw">fn</span> <span class="ident">into_reader</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Reader</span><span class="op">></span> {
<span class="prelude-val">Ok</span>(<span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="self">self</span>.<span class="ident">read_image</span>()<span class="question-mark">?</span>))
}
<span class="kw">fn</span> <span class="ident">read_image</span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</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="self">self</span>.<span class="ident">read</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Read</span><span class="op">></span> <span class="ident">PNMDecoder</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</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">match</span> <span class="self">self</span>.<span class="ident">tuple</span> {
<span class="ident">TupleType</span>::<span class="ident">PbmBit</span> <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">read_samples</span>::<span class="op"><</span><span class="ident">PbmBit</span><span class="op">></span>(<span class="number">1</span>),
<span class="ident">TupleType</span>::<span class="ident">BWBit</span> <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">read_samples</span>::<span class="op"><</span><span class="ident">BWBit</span><span class="op">></span>(<span class="number">1</span>),
<span class="ident">TupleType</span>::<span class="ident">RGBU8</span> <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">read_samples</span>::<span class="op"><</span><span class="ident">U8</span><span class="op">></span>(<span class="number">3</span>),
<span class="ident">TupleType</span>::<span class="ident">RGBU16</span> <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">read_samples</span>::<span class="op"><</span><span class="ident">U16</span><span class="op">></span>(<span class="number">3</span>),
<span class="ident">TupleType</span>::<span class="ident">GrayU8</span> <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">read_samples</span>::<span class="op"><</span><span class="ident">U8</span><span class="op">></span>(<span class="number">1</span>),
<span class="ident">TupleType</span>::<span class="ident">GrayU16</span> <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">read_samples</span>::<span class="op"><</span><span class="ident">U16</span><span class="op">></span>(<span class="number">1</span>),
}
}
<span class="kw">fn</span> <span class="ident">read_samples</span><span class="op"><</span><span class="ident">S</span>: <span class="ident">Sample</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">components</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</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">match</span> <span class="self">self</span>.<span class="ident">subtype</span>().<span class="ident">sample_encoding</span>() {
<span class="ident">SampleEncoding</span>::<span class="ident">Binary</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">width</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">header</span>.<span class="ident">width</span>();
<span class="kw">let</span> <span class="ident">height</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">header</span>.<span class="ident">height</span>();
<span class="kw">let</span> <span class="ident">bytecount</span> <span class="op">=</span> <span class="ident">S</span>::<span class="ident">bytelen</span>(<span class="ident">width</span>, <span class="ident">height</span>, <span class="ident">components</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">0</span> <span class="kw">as</span> <span class="ident">u8</span>; <span class="ident">bytecount</span>];
(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">reader</span>)
.<span class="ident">read_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">bytes</span>)
.<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">ImageError</span>::<span class="ident">NotEnoughData</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">samples</span> <span class="op">=</span> <span class="ident">S</span>::<span class="ident">from_bytes</span>(<span class="kw-2">&</span><span class="ident">bytes</span>, <span class="ident">width</span>, <span class="ident">height</span>, <span class="ident">components</span>)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">samples</span>.<span class="ident">into</span>())
}
<span class="ident">SampleEncoding</span>::<span class="ident">Ascii</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">samples</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">read_ascii</span>::<span class="op"><</span><span class="ident">S</span><span class="op">></span>(<span class="ident">components</span>)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">samples</span>.<span class="ident">into</span>())
}
}
}
<span class="kw">fn</span> <span class="ident">read_ascii</span><span class="op"><</span><span class="ident">Basic</span>: <span class="ident">Sample</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">components</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</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="ident">Basic</span>::<span class="ident">from_ascii</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">reader</span>, <span class="self">self</span>.<span class="ident">header</span>.<span class="ident">width</span>(), <span class="self">self</span>.<span class="ident">header</span>.<span class="ident">height</span>(), <span class="ident">components</span>)
}
<span class="doccomment">/// Get the pnm subtype, depending on the magic constant contained in the header</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">subtype</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">PNMSubtype</span> {
<span class="self">self</span>.<span class="ident">header</span>.<span class="ident">subtype</span>()
}
}
<span class="kw">impl</span> <span class="ident">TupleType</span> {
<span class="kw">fn</span> <span class="ident">color</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ColorType</span> {
<span class="kw">use</span> <span class="self">self</span>::<span class="ident">TupleType</span>::<span class="kw-2">*</span>;
<span class="kw">match</span> <span class="self">self</span> {
<span class="ident">PbmBit</span> <span class="op">=</span><span class="op">></span> <span class="ident">ColorType</span>::<span class="ident">Gray</span>(<span class="number">1</span>),
<span class="ident">BWBit</span> <span class="op">=</span><span class="op">></span> <span class="ident">ColorType</span>::<span class="ident">Gray</span>(<span class="number">1</span>),
<span class="ident">GrayU8</span> <span class="op">=</span><span class="op">></span> <span class="ident">ColorType</span>::<span class="ident">Gray</span>(<span class="number">8</span>),
<span class="ident">GrayU16</span> <span class="op">=</span><span class="op">></span> <span class="ident">ColorType</span>::<span class="ident">Gray</span>(<span class="number">16</span>),
<span class="ident">RGBU8</span> <span class="op">=</span><span class="op">></span> <span class="ident">ColorType</span>::<span class="ident">RGB</span>(<span class="number">8</span>),
<span class="ident">RGBU16</span> <span class="op">=</span><span class="op">></span> <span class="ident">ColorType</span>::<span class="ident">GrayA</span>(<span class="number">16</span>),
}
}
}
<span class="kw">fn</span> <span class="ident">read_separated_ascii</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">FromStr</span><span class="op">></span>(<span class="ident">reader</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Read</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>::<span class="prelude-val">Err</span>: <span class="ident">Display</span>
{
<span class="kw">let</span> <span class="ident">is_separator</span> <span class="op">=</span> <span class="op">|</span><span class="ident">v</span>: <span class="kw-2">&</span><span class="ident">u8</span><span class="op">|</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">v</span> {
<span class="string">b'\t'</span> <span class="op">|</span> <span class="string">b'\n'</span> <span class="op">|</span> <span class="string">b'\x0b'</span> <span class="op">|</span> <span class="string">b'\x0c'</span> <span class="op">|</span> <span class="string">b'\r'</span> <span class="op">|</span> <span class="string">b' '</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="kw">let</span> <span class="ident">token</span> <span class="op">=</span> <span class="ident">reader</span>
.<span class="ident">bytes</span>()
.<span class="ident">skip_while</span>(<span class="op">|</span><span class="ident">v</span><span class="op">|</span> <span class="ident">v</span>.<span class="ident">as_ref</span>().<span class="ident">ok</span>().<span class="ident">map</span>(<span class="kw-2">&</span><span class="ident">is_separator</span>).<span class="ident">unwrap_or</span>(<span class="bool-val">false</span>))
.<span class="ident">take_while</span>(<span class="op">|</span><span class="ident">v</span><span class="op">|</span> <span class="ident">v</span>.<span class="ident">as_ref</span>().<span class="ident">ok</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="op">!</span><span class="ident">is_separator</span>(<span class="ident">c</span>)).<span class="ident">unwrap_or</span>(<span class="bool-val">false</span>))
.<span class="ident">collect</span>::<span class="op"><</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="kw">_</span><span class="op">></span><span class="op">></span>()<span class="question-mark">?</span>;
<span class="kw">if</span> <span class="op">!</span><span class="ident">token</span>.<span class="ident">is_ascii</span>() {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Non ascii character where sample value was expected"</span>.<span class="ident">to_string</span>(),
));
}
<span class="kw">let</span> <span class="ident">string</span> <span class="op">=</span> <span class="ident">str</span>::<span class="ident">from_utf8</span>(<span class="kw-2">&</span><span class="ident">token</span>)
<span class="comment">// We checked the precondition ourselves a few lines before, `token.is_ascii()`.</span>
.<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="macro">unreachable</span><span class="macro">!</span>(<span class="string">"Only ascii characters should be decoded"</span>));
<span class="ident">string</span>
.<span class="ident">parse</span>()
.<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> <span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"Error parsing {} as a sample: {}"</span>, <span class="ident">string</span>, <span class="ident">err</span>)))
}
<span class="kw">impl</span> <span class="ident">Sample</span> <span class="kw">for</span> <span class="ident">U8</span> {
<span class="kw">fn</span> <span class="ident">bytelen</span>(<span class="ident">width</span>: <span class="ident">u32</span>, <span class="ident">height</span>: <span class="ident">u32</span>, <span class="ident">samples</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="prelude-val">Ok</span>((<span class="ident">width</span> <span class="op">*</span> <span class="ident">height</span> <span class="op">*</span> <span class="ident">samples</span>) <span class="kw">as</span> <span class="ident">usize</span>)
}
<span class="kw">fn</span> <span class="ident">from_bytes</span>(
<span class="ident">bytes</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>],
<span class="ident">_width</span>: <span class="ident">u32</span>,
<span class="ident">_height</span>: <span class="ident">u32</span>,
<span class="ident">_samples</span>: <span class="ident">u32</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</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">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="ident">buffer</span>.<span class="ident">resize</span>(<span class="ident">bytes</span>.<span class="ident">len</span>(), <span class="number">0</span> <span class="kw">as</span> <span class="ident">u8</span>);
<span class="ident">buffer</span>.<span class="ident">copy_from_slice</span>(<span class="ident">bytes</span>);
<span class="prelude-val">Ok</span>(<span class="ident">buffer</span>)
}
<span class="kw">fn</span> <span class="ident">from_ascii</span>(
<span class="ident">reader</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Read</span>,
<span class="ident">width</span>: <span class="ident">u32</span>,
<span class="ident">height</span>: <span class="ident">u32</span>,
<span class="ident">samples</span>: <span class="ident">u32</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</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="number">0</span>..<span class="ident">width</span><span class="kw-2">*</span><span class="ident">height</span><span class="kw-2">*</span><span class="ident">samples</span>)
.<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">read_separated_ascii</span>(<span class="ident">reader</span>))
.<span class="ident">collect</span>()
}
}
<span class="kw">impl</span> <span class="ident">Sample</span> <span class="kw">for</span> <span class="ident">U16</span> {
<span class="kw">fn</span> <span class="ident">bytelen</span>(<span class="ident">width</span>: <span class="ident">u32</span>, <span class="ident">height</span>: <span class="ident">u32</span>, <span class="ident">samples</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="prelude-val">Ok</span>((<span class="ident">width</span> <span class="op">*</span> <span class="ident">height</span> <span class="op">*</span> <span class="ident">samples</span> <span class="op">*</span> <span class="number">2</span>) <span class="kw">as</span> <span class="ident">usize</span>)
}
<span class="kw">fn</span> <span class="ident">from_bytes</span>(
<span class="ident">bytes</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>],
<span class="ident">width</span>: <span class="ident">u32</span>,
<span class="ident">height</span>: <span class="ident">u32</span>,
<span class="ident">samples</span>: <span class="ident">u32</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</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="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">bytes</span>.<span class="ident">len</span>(), (<span class="ident">width</span><span class="kw-2">*</span><span class="ident">height</span><span class="kw-2">*</span><span class="ident">samples</span><span class="kw-2">*</span><span class="number">2</span>) <span class="kw">as</span> <span class="ident">usize</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buffer</span> <span class="op">=</span> <span class="ident">bytes</span>.<span class="ident">to_vec</span>();
<span class="kw">for</span> <span class="ident">chunk</span> <span class="kw">in</span> <span class="ident">buffer</span>.<span class="ident">chunks_mut</span>(<span class="number">2</span>) {
<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">BigEndian</span>::<span class="ident">read_u16</span>(<span class="ident">chunk</span>);
<span class="ident">NativeEndian</span>::<span class="ident">write_u16</span>(<span class="ident">chunk</span>, <span class="ident">v</span>);
}
<span class="prelude-val">Ok</span>(<span class="ident">buffer</span>)
}
<span class="kw">fn</span> <span class="ident">from_ascii</span>(
<span class="ident">reader</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Read</span>,
<span class="ident">width</span>: <span class="ident">u32</span>,
<span class="ident">height</span>: <span class="ident">u32</span>,
<span class="ident">samples</span>: <span class="ident">u32</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</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">let</span> <span class="kw-2">mut</span> <span class="ident">buffer</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">0</span>; (<span class="ident">width</span> <span class="op">*</span> <span class="ident">height</span> <span class="op">*</span> <span class="ident">samples</span> <span class="op">*</span> <span class="number">2</span>) <span class="kw">as</span> <span class="ident">usize</span>];
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..(<span class="ident">width</span><span class="kw-2">*</span><span class="ident">height</span><span class="kw-2">*</span><span class="ident">samples</span>) <span class="kw">as</span> <span class="ident">usize</span> {
<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">read_separated_ascii</span>::<span class="op"><</span><span class="ident">u16</span><span class="op">></span>(<span class="ident">reader</span>)<span class="question-mark">?</span>;
<span class="ident">NativeEndian</span>::<span class="ident">write_u16</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buffer</span>[<span class="number">2</span><span class="kw-2">*</span><span class="ident">i</span>..][..<span class="number">2</span>], <span class="ident">v</span>);
}
<span class="prelude-val">Ok</span>(<span class="ident">buffer</span>)
}
}
<span class="comment">// The image is encoded in rows of bits, high order bits first. Any bits beyond the row bits should</span>
<span class="comment">// be ignored. Also, contrary to rgb, black pixels are encoded as a 1 while white is 0. This will</span>
<span class="comment">// need to be reversed for the grayscale output.</span>
<span class="kw">impl</span> <span class="ident">Sample</span> <span class="kw">for</span> <span class="ident">PbmBit</span> {
<span class="kw">fn</span> <span class="ident">bytelen</span>(<span class="ident">width</span>: <span class="ident">u32</span>, <span class="ident">height</span>: <span class="ident">u32</span>, <span class="ident">samples</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">count</span> <span class="op">=</span> <span class="ident">width</span> <span class="op">*</span> <span class="ident">samples</span>;
<span class="kw">let</span> <span class="ident">linelen</span> <span class="op">=</span> (<span class="ident">count</span> <span class="op">/</span> <span class="number">8</span>) <span class="op">+</span> ((<span class="ident">count</span> <span class="op">%</span> <span class="number">8</span>) <span class="op">!</span><span class="op">=</span> <span class="number">0</span>) <span class="kw">as</span> <span class="ident">u32</span>;
<span class="prelude-val">Ok</span>((<span class="ident">linelen</span> <span class="op">*</span> <span class="ident">height</span>) <span class="kw">as</span> <span class="ident">usize</span>)
}
<span class="kw">fn</span> <span class="ident">from_bytes</span>(
<span class="ident">bytes</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>],
<span class="ident">_width</span>: <span class="ident">u32</span>,
<span class="ident">_height</span>: <span class="ident">u32</span>,
<span class="ident">_samples</span>: <span class="ident">u32</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</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="prelude-val">Ok</span>(<span class="ident">bytes</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">pixel</span><span class="op">|</span> <span class="op">!</span><span class="ident">pixel</span>).<span class="ident">collect</span>())
}
<span class="kw">fn</span> <span class="ident">from_ascii</span>(
<span class="ident">reader</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Read</span>,
<span class="ident">width</span>: <span class="ident">u32</span>,
<span class="ident">height</span>: <span class="ident">u32</span>,
<span class="ident">samples</span>: <span class="ident">u32</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</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">let</span> <span class="ident">count</span> <span class="op">=</span> (<span class="ident">width</span><span class="kw-2">*</span><span class="ident">height</span><span class="kw-2">*</span><span class="ident">samples</span>) <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">let</span> <span class="ident">raw_samples</span> <span class="op">=</span> <span class="ident">reader</span>.<span class="ident">bytes</span>()
.<span class="ident">filter_map</span>(<span class="op">|</span><span class="ident">ascii</span><span class="op">|</span> <span class="kw">match</span> <span class="ident">ascii</span> {
<span class="prelude-val">Ok</span>(<span class="string">b'0'</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="number">1</span>)),
<span class="prelude-val">Ok</span>(<span class="string">b'1'</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="number">0</span>)),
<span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">IoError</span>(<span class="ident">err</span>))),
<span class="prelude-val">Ok</span>(<span class="string">b'\t'</span>)
<span class="op">|</span> <span class="prelude-val">Ok</span>(<span class="string">b'\n'</span>)
<span class="op">|</span> <span class="prelude-val">Ok</span>(<span class="string">b'\x0b'</span>)
<span class="op">|</span> <span class="prelude-val">Ok</span>(<span class="string">b'\x0c'</span>)
<span class="op">|</span> <span class="prelude-val">Ok</span>(<span class="string">b'\r'</span>)
<span class="op">|</span> <span class="prelude-val">Ok</span>(<span class="string">b' '</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
<span class="prelude-val">Ok</span>(<span class="ident">c</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="macro">format</span><span class="macro">!</span>(<span class="string">"Unexpected character {} within sample raster"</span>, <span class="ident">c</span>),
))),
})
.<span class="ident">take</span>(<span class="ident">count</span>)
.<span class="ident">collect</span>::<span class="op"><</span><span class="ident">ImageResult</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="op">></span>()<span class="question-mark">?</span>;
<span class="kw">if</span> <span class="ident">raw_samples</span>.<span class="ident">len</span>() <span class="op"><</span> <span class="ident">count</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">NotEnoughData</span>)
}
<span class="prelude-val">Ok</span>(<span class="ident">raw_samples</span>)
}
}
<span class="comment">// Encoded just like a normal U8 but we check the values.</span>
<span class="kw">impl</span> <span class="ident">Sample</span> <span class="kw">for</span> <span class="ident">BWBit</span> {
<span class="kw">fn</span> <span class="ident">bytelen</span>(<span class="ident">width</span>: <span class="ident">u32</span>, <span class="ident">height</span>: <span class="ident">u32</span>, <span class="ident">samples</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="ident">U8</span>::<span class="ident">bytelen</span>(<span class="ident">width</span>, <span class="ident">height</span>, <span class="ident">samples</span>)
}
<span class="kw">fn</span> <span class="ident">from_bytes</span>(
<span class="ident">bytes</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>],
<span class="ident">width</span>: <span class="ident">u32</span>,
<span class="ident">height</span>: <span class="ident">u32</span>,
<span class="ident">samples</span>: <span class="ident">u32</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</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">let</span> <span class="ident">values</span> <span class="op">=</span> <span class="ident">U8</span>::<span class="ident">from_bytes</span>(<span class="ident">bytes</span>, <span class="ident">width</span>, <span class="ident">height</span>, <span class="ident">samples</span>)<span class="question-mark">?</span>;
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">val</span>) <span class="op">=</span> <span class="ident">values</span>.<span class="ident">iter</span>().<span class="ident">find</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">val</span><span class="op">|</span> <span class="kw-2">*</span><span class="ident">val</span> <span class="op">></span> <span class="number">1</span>) {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="macro">format</span><span class="macro">!</span>(<span class="string">"Sample value {} outside of bounds"</span>, <span class="ident">val</span>),
));
};
<span class="prelude-val">Ok</span>(<span class="ident">values</span>)
}
<span class="kw">fn</span> <span class="ident">from_ascii</span>(
<span class="ident">_reader</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Read</span>,
<span class="ident">_width</span>: <span class="ident">u32</span>,
<span class="ident">_height</span>: <span class="ident">u32</span>,
<span class="ident">_samples</span>: <span class="ident">u32</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</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="macro">unreachable</span><span class="macro">!</span>(<span class="string">"BW bits from anymaps are never encoded as ascii"</span>)
}
}
<span class="kw">impl</span> <span class="ident">DecodableImageHeader</span> <span class="kw">for</span> <span class="ident">BitmapHeader</span> {
<span class="kw">fn</span> <span class="ident">tuple_type</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">TupleType</span><span class="op">></span> {
<span class="prelude-val">Ok</span>(<span class="ident">TupleType</span>::<span class="ident">PbmBit</span>)
}
}
<span class="kw">impl</span> <span class="ident">DecodableImageHeader</span> <span class="kw">for</span> <span class="ident">GraymapHeader</span> {
<span class="kw">fn</span> <span class="ident">tuple_type</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">TupleType</span><span class="op">></span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">maxwhite</span> {
<span class="ident">v</span> <span class="kw">if</span> <span class="ident">v</span> <span class="op"><</span><span class="op">=</span> <span class="number">0xFF</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="ident">TupleType</span>::<span class="ident">GrayU8</span>),
<span class="ident">v</span> <span class="kw">if</span> <span class="ident">v</span> <span class="op"><</span><span class="op">=</span> <span class="number">0xFFFF</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="ident">TupleType</span>::<span class="ident">GrayU16</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Image maxval is not less or equal to 65535"</span>.<span class="ident">to_string</span>(),
)),
}
}
}
<span class="kw">impl</span> <span class="ident">DecodableImageHeader</span> <span class="kw">for</span> <span class="ident">PixmapHeader</span> {
<span class="kw">fn</span> <span class="ident">tuple_type</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">TupleType</span><span class="op">></span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">maxval</span> {
<span class="ident">v</span> <span class="kw">if</span> <span class="ident">v</span> <span class="op"><</span><span class="op">=</span> <span class="number">0xFF</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="ident">TupleType</span>::<span class="ident">RGBU8</span>),
<span class="ident">v</span> <span class="kw">if</span> <span class="ident">v</span> <span class="op"><</span><span class="op">=</span> <span class="number">0xFFFF</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="ident">TupleType</span>::<span class="ident">RGBU16</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Image maxval is not less or equal to 65535"</span>.<span class="ident">to_string</span>(),
)),
}
}
}
<span class="kw">impl</span> <span class="ident">DecodableImageHeader</span> <span class="kw">for</span> <span class="ident">ArbitraryHeader</span> {
<span class="kw">fn</span> <span class="ident">tuple_type</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">TupleType</span><span class="op">></span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">tupltype</span> {
<span class="prelude-val">None</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">depth</span> <span class="op">=</span><span class="op">=</span> <span class="number">1</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="ident">TupleType</span>::<span class="ident">GrayU8</span>),
<span class="prelude-val">None</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">depth</span> <span class="op">=</span><span class="op">=</span> <span class="number">2</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">UnsupportedColor</span>(<span class="ident">ColorType</span>::<span class="ident">GrayA</span>(<span class="number">8</span>))),
<span class="prelude-val">None</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">depth</span> <span class="op">=</span><span class="op">=</span> <span class="number">3</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="ident">TupleType</span>::<span class="ident">RGBU8</span>),
<span class="prelude-val">None</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">depth</span> <span class="op">=</span><span class="op">=</span> <span class="number">4</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">UnsupportedColor</span>(<span class="ident">ColorType</span>::<span class="ident">RGBA</span>(<span class="number">8</span>))),
<span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">BlackAndWhite</span>) <span class="kw">if</span> <span class="self">self</span>.<span class="ident">maxval</span> <span class="op">=</span><span class="op">=</span> <span class="number">1</span> <span class="kw-2">&</span><span class="op">&</span> <span class="self">self</span>.<span class="ident">depth</span> <span class="op">=</span><span class="op">=</span> <span class="number">1</span> <span class="op">=</span><span class="op">></span> {
<span class="prelude-val">Ok</span>(<span class="ident">TupleType</span>::<span class="ident">BWBit</span>)
}
<span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">BlackAndWhite</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Invalid depth or maxval for tuple type BLACKANDWHITE"</span>.<span class="ident">to_string</span>(),
)),
<span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">Grayscale</span>) <span class="kw">if</span> <span class="self">self</span>.<span class="ident">depth</span> <span class="op">=</span><span class="op">=</span> <span class="number">1</span> <span class="kw-2">&</span><span class="op">&</span> <span class="self">self</span>.<span class="ident">maxval</span> <span class="op"><</span><span class="op">=</span> <span class="number">0xFF</span> <span class="op">=</span><span class="op">></span> {
<span class="prelude-val">Ok</span>(<span class="ident">TupleType</span>::<span class="ident">GrayU8</span>)
}
<span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">Grayscale</span>) <span class="kw">if</span> <span class="self">self</span>.<span class="ident">depth</span> <span class="op"><</span><span class="op">=</span> <span class="number">1</span> <span class="kw-2">&</span><span class="op">&</span> <span class="self">self</span>.<span class="ident">maxval</span> <span class="op"><</span><span class="op">=</span> <span class="number">0xFFFF</span> <span class="op">=</span><span class="op">></span> {
<span class="prelude-val">Ok</span>(<span class="ident">TupleType</span>::<span class="ident">GrayU16</span>)
}
<span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">Grayscale</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Invalid depth or maxval for tuple type GRAYSCALE"</span>.<span class="ident">to_string</span>(),
)),
<span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">RGB</span>) <span class="kw">if</span> <span class="self">self</span>.<span class="ident">depth</span> <span class="op">=</span><span class="op">=</span> <span class="number">3</span> <span class="kw-2">&</span><span class="op">&</span> <span class="self">self</span>.<span class="ident">maxval</span> <span class="op"><</span><span class="op">=</span> <span class="number">0xFF</span> <span class="op">=</span><span class="op">></span> {
<span class="prelude-val">Ok</span>(<span class="ident">TupleType</span>::<span class="ident">RGBU8</span>)
}
<span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">RGB</span>) <span class="kw">if</span> <span class="self">self</span>.<span class="ident">depth</span> <span class="op">=</span><span class="op">=</span> <span class="number">3</span> <span class="kw-2">&</span><span class="op">&</span> <span class="self">self</span>.<span class="ident">maxval</span> <span class="op"><</span><span class="op">=</span> <span class="number">0xFFFF</span> <span class="op">=</span><span class="op">></span> {
<span class="prelude-val">Ok</span>(<span class="ident">TupleType</span>::<span class="ident">RGBU16</span>)
}
<span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">RGB</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Invalid depth for tuple type RGB"</span>.<span class="ident">to_string</span>(),
)),
<span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">BlackAndWhiteAlpha</span>) <span class="op">=</span><span class="op">></span> {
<span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">UnsupportedColor</span>(<span class="ident">ColorType</span>::<span class="ident">GrayA</span>(<span class="number">1</span>)))
}
<span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">GrayscaleAlpha</span>) <span class="op">=</span><span class="op">></span> {
<span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">UnsupportedColor</span>(<span class="ident">ColorType</span>::<span class="ident">GrayA</span>(<span class="number">8</span>)))
}
<span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">RGBAlpha</span>) <span class="op">=</span><span class="op">></span> {
<span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">UnsupportedColor</span>(<span class="ident">ColorType</span>::<span class="ident">RGBA</span>(<span class="number">8</span>)))
}
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Tuple type not recognized"</span>.<span class="ident">to_string</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="kw">super</span>::<span class="kw-2">*</span>;
<span class="doccomment">/// Tests reading of a valid blackandwhite pam</span>
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">pam_blackandwhite</span>() {
<span class="kw">let</span> <span class="ident">pamdata</span> <span class="op">=</span> <span class="string">b"P7
WIDTH 4
HEIGHT 4
DEPTH 1
MAXVAL 1
TUPLTYPE BLACKANDWHITE
# Comment line
ENDHDR
\x01\x00\x00\x01\x01\x00\x00\x01\x01\x00\x00\x01\x01\x00\x00\x01"</span>;
<span class="kw">let</span> <span class="ident">decoder</span> <span class="op">=</span> <span class="ident">PNMDecoder</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">pamdata</span>[..]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">colortype</span>(), <span class="ident">ColorType</span>::<span class="ident">Gray</span>(<span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">dimensions</span>(), (<span class="number">4</span>, <span class="number">4</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">subtype</span>(), <span class="ident">PNMSubtype</span>::<span class="ident">ArbitraryMap</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">decoder</span>.<span class="ident">read_image</span>().<span class="ident">unwrap</span>(),
<span class="macro">vec</span><span class="macro">!</span>[<span class="number">0x01</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x01</span>, <span class="number">0x01</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x01</span>, <span class="number">0x01</span>, <span class="number">0x00</span>, <span class="number">0x00</span>, <span class="number">0x01</span>, <span class="number">0x01</span>, <span class="number">0x00</span>,
<span class="number">0x00</span>, <span class="number">0x01</span>]
);
<span class="kw">match</span> <span class="ident">PNMDecoder</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">pamdata</span>[..]).<span class="ident">unwrap</span>().<span class="ident">into_inner</span>() {
(
<span class="kw">_</span>,
<span class="ident">PNMHeader</span> {
<span class="ident">decoded</span>:
<span class="ident">HeaderRecord</span>::<span class="ident">Arbitrary</span>(<span class="ident">ArbitraryHeader</span> {
<span class="ident">width</span>: <span class="number">4</span>,
<span class="ident">height</span>: <span class="number">4</span>,
<span class="ident">maxval</span>: <span class="number">1</span>,
<span class="ident">depth</span>: <span class="number">1</span>,
<span class="ident">tupltype</span>: <span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">BlackAndWhite</span>),
}),
<span class="ident">encoded</span>: <span class="kw">_</span>,
},
) <span class="op">=</span><span class="op">></span> (),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Decoded header is incorrect"</span>),
}
}
<span class="doccomment">/// Tests reading of a valid grayscale pam</span>
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">pam_grayscale</span>() {
<span class="kw">let</span> <span class="ident">pamdata</span> <span class="op">=</span> <span class="string">b"P7
WIDTH 4
HEIGHT 4
DEPTH 1
MAXVAL 255
TUPLTYPE GRAYSCALE
# Comment line
ENDHDR
\xde\xad\xbe\xef\xde\xad\xbe\xef\xde\xad\xbe\xef\xde\xad\xbe\xef"</span>;
<span class="kw">let</span> <span class="ident">decoder</span> <span class="op">=</span> <span class="ident">PNMDecoder</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">pamdata</span>[..]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">colortype</span>(), <span class="ident">ColorType</span>::<span class="ident">Gray</span>(<span class="number">8</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">dimensions</span>(), (<span class="number">4</span>, <span class="number">4</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">subtype</span>(), <span class="ident">PNMSubtype</span>::<span class="ident">ArbitraryMap</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">decoder</span>.<span class="ident">read_image</span>().<span class="ident">unwrap</span>(),
<span class="macro">vec</span><span class="macro">!</span>[<span class="number">0xde</span>, <span class="number">0xad</span>, <span class="number">0xbe</span>, <span class="number">0xef</span>, <span class="number">0xde</span>, <span class="number">0xad</span>, <span class="number">0xbe</span>, <span class="number">0xef</span>, <span class="number">0xde</span>, <span class="number">0xad</span>, <span class="number">0xbe</span>, <span class="number">0xef</span>, <span class="number">0xde</span>, <span class="number">0xad</span>,
<span class="number">0xbe</span>, <span class="number">0xef</span>]
);
<span class="kw">match</span> <span class="ident">PNMDecoder</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">pamdata</span>[..]).<span class="ident">unwrap</span>().<span class="ident">into_inner</span>() {
(
<span class="kw">_</span>,
<span class="ident">PNMHeader</span> {
<span class="ident">decoded</span>:
<span class="ident">HeaderRecord</span>::<span class="ident">Arbitrary</span>(<span class="ident">ArbitraryHeader</span> {
<span class="ident">width</span>: <span class="number">4</span>,
<span class="ident">height</span>: <span class="number">4</span>,
<span class="ident">depth</span>: <span class="number">1</span>,
<span class="ident">maxval</span>: <span class="number">255</span>,
<span class="ident">tupltype</span>: <span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">Grayscale</span>),
}),
<span class="ident">encoded</span>: <span class="kw">_</span>,
},
) <span class="op">=</span><span class="op">></span> (),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Decoded header is incorrect"</span>),
}
}
<span class="doccomment">/// Tests reading of a valid rgb pam</span>
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">pam_rgb</span>() {
<span class="kw">let</span> <span class="ident">pamdata</span> <span class="op">=</span> <span class="string">b"P7
# Comment line
MAXVAL 255
TUPLTYPE RGB
DEPTH 3
WIDTH 2
HEIGHT 2
ENDHDR
\xde\xad\xbe\xef\xde\xad\xbe\xef\xde\xad\xbe\xef"</span>;
<span class="kw">let</span> <span class="ident">decoder</span> <span class="op">=</span> <span class="ident">PNMDecoder</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">pamdata</span>[..]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">colortype</span>(), <span class="ident">ColorType</span>::<span class="ident">RGB</span>(<span class="number">8</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">dimensions</span>(), (<span class="number">2</span>, <span class="number">2</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">subtype</span>(), <span class="ident">PNMSubtype</span>::<span class="ident">ArbitraryMap</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">read_image</span>().<span class="ident">unwrap</span>(),
<span class="macro">vec</span><span class="macro">!</span>[<span class="number">0xde</span>, <span class="number">0xad</span>, <span class="number">0xbe</span>, <span class="number">0xef</span>, <span class="number">0xde</span>, <span class="number">0xad</span>, <span class="number">0xbe</span>, <span class="number">0xef</span>, <span class="number">0xde</span>, <span class="number">0xad</span>, <span class="number">0xbe</span>, <span class="number">0xef</span>]);
<span class="kw">match</span> <span class="ident">PNMDecoder</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">pamdata</span>[..]).<span class="ident">unwrap</span>().<span class="ident">into_inner</span>() {
(
<span class="kw">_</span>,
<span class="ident">PNMHeader</span> {
<span class="ident">decoded</span>:
<span class="ident">HeaderRecord</span>::<span class="ident">Arbitrary</span>(<span class="ident">ArbitraryHeader</span> {
<span class="ident">maxval</span>: <span class="number">255</span>,
<span class="ident">tupltype</span>: <span class="prelude-val">Some</span>(<span class="ident">ArbitraryTuplType</span>::<span class="ident">RGB</span>),
<span class="ident">depth</span>: <span class="number">3</span>,
<span class="ident">width</span>: <span class="number">2</span>,
<span class="ident">height</span>: <span class="number">2</span>,
}),
<span class="ident">encoded</span>: <span class="kw">_</span>,
},
) <span class="op">=</span><span class="op">></span> (),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Decoded header is incorrect"</span>),
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">pbm_binary</span>() {
<span class="comment">// The data contains two rows of the image (each line is padded to the full byte). For</span>
<span class="comment">// comments on its format, see documentation of `impl SampleType for PbmBit`.</span>
<span class="kw">let</span> <span class="ident">pbmbinary</span> <span class="op">=</span> [<span class="kw-2">&</span><span class="string">b"P4 6 2\n"</span>[..], <span class="kw-2">&</span>[<span class="number">0b01101100</span> <span class="kw">as</span> <span class="ident">u8</span>, <span class="number">0b10110111</span>]].<span class="ident">concat</span>();
<span class="kw">let</span> <span class="ident">decoder</span> <span class="op">=</span> <span class="ident">PNMDecoder</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">pbmbinary</span>[..]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">colortype</span>(), <span class="ident">ColorType</span>::<span class="ident">Gray</span>(<span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">dimensions</span>(), (<span class="number">6</span>, <span class="number">2</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">decoder</span>.<span class="ident">subtype</span>(),
<span class="ident">PNMSubtype</span>::<span class="ident">Bitmap</span>(<span class="ident">SampleEncoding</span>::<span class="ident">Binary</span>)
);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">read_image</span>().<span class="ident">unwrap</span>(), <span class="macro">vec</span><span class="macro">!</span>[<span class="number">0b10010011</span>, <span class="number">0b01001000</span>]);
<span class="kw">match</span> <span class="ident">PNMDecoder</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">pbmbinary</span>[..]).<span class="ident">unwrap</span>().<span class="ident">into_inner</span>() {
(
<span class="kw">_</span>,
<span class="ident">PNMHeader</span> {
<span class="ident">decoded</span>:
<span class="ident">HeaderRecord</span>::<span class="ident">Bitmap</span>(<span class="ident">BitmapHeader</span> {
<span class="ident">encoding</span>: <span class="ident">SampleEncoding</span>::<span class="ident">Binary</span>,
<span class="ident">width</span>: <span class="number">6</span>,
<span class="ident">height</span>: <span class="number">2</span>,
}),
<span class="ident">encoded</span>: <span class="kw">_</span>,
},
) <span class="op">=</span><span class="op">></span> (),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Decoded header is incorrect"</span>),
}
}
<span class="doccomment">/// A previous inifite loop.</span>
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">pbm_binary_ascii_termination</span>() {
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="ident">Cursor</span>, <span class="ident">Error</span>, <span class="ident">ErrorKind</span>, <span class="ident">Read</span>, <span class="prelude-ty">Result</span>};
<span class="kw">struct</span> <span class="ident">FailRead</span>(<span class="ident">Cursor</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'static</span> [<span class="ident">u8</span>]<span class="op">></span>);
<span class="kw">impl</span> <span class="ident">Read</span> <span class="kw">for</span> <span class="ident">FailRead</span> {
<span class="kw">fn</span> <span class="ident">read</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="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="number">0</span>.<span class="ident">read</span>(<span class="ident">buf</span>) {
<span class="prelude-val">Ok</span>(<span class="ident">n</span>) <span class="kw">if</span> <span class="ident">n</span> <span class="op">></span> <span class="number">0</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="ident">n</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">new</span>(
<span class="ident">ErrorKind</span>::<span class="ident">BrokenPipe</span>,
<span class="string">"Simulated broken pipe error"</span>
)),
}
}
}
<span class="kw">let</span> <span class="ident">pbmbinary</span> <span class="op">=</span> <span class="ident">FailRead</span>(<span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="string">b"P1 1 1\n"</span>));
<span class="ident">PNMDecoder</span>::<span class="ident">new</span>(<span class="ident">pbmbinary</span>).<span class="ident">unwrap</span>()
.<span class="ident">read_image</span>().<span class="ident">expect_err</span>(<span class="string">"Image is malformed"</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">pbm_ascii</span>() {
<span class="comment">// The data contains two rows of the image (each line is padded to the full byte). For</span>
<span class="comment">// comments on its format, see documentation of `impl SampleType for PbmBit`. Tests all</span>
<span class="comment">// whitespace characters that should be allowed (the 6 characters according to POSIX).</span>
<span class="kw">let</span> <span class="ident">pbmbinary</span> <span class="op">=</span> <span class="string">b"P1 6 2\n 0 1 1 0 1 1\n1 0 1 1 0\t\n\x0b\x0c\r1"</span>;
<span class="kw">let</span> <span class="ident">decoder</span> <span class="op">=</span> <span class="ident">PNMDecoder</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">pbmbinary</span>[..]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">colortype</span>(), <span class="ident">ColorType</span>::<span class="ident">Gray</span>(<span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">dimensions</span>(), (<span class="number">6</span>, <span class="number">2</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">subtype</span>(), <span class="ident">PNMSubtype</span>::<span class="ident">Bitmap</span>(<span class="ident">SampleEncoding</span>::<span class="ident">Ascii</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">read_image</span>().<span class="ident">unwrap</span>(), <span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>]);
<span class="kw">match</span> <span class="ident">PNMDecoder</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">pbmbinary</span>[..]).<span class="ident">unwrap</span>().<span class="ident">into_inner</span>() {
(
<span class="kw">_</span>,
<span class="ident">PNMHeader</span> {
<span class="ident">decoded</span>:
<span class="ident">HeaderRecord</span>::<span class="ident">Bitmap</span>(<span class="ident">BitmapHeader</span> {
<span class="ident">encoding</span>: <span class="ident">SampleEncoding</span>::<span class="ident">Ascii</span>,
<span class="ident">width</span>: <span class="number">6</span>,
<span class="ident">height</span>: <span class="number">2</span>,
}),
<span class="ident">encoded</span>: <span class="kw">_</span>,
},
) <span class="op">=</span><span class="op">></span> (),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Decoded header is incorrect"</span>),
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">pbm_ascii_nospace</span>() {
<span class="comment">// The data contains two rows of the image (each line is padded to the full byte). Notably,</span>
<span class="comment">// it is completely within specification for the ascii data not to contain separating</span>
<span class="comment">// whitespace for the pbm format or any mix.</span>
<span class="kw">let</span> <span class="ident">pbmbinary</span> <span class="op">=</span> <span class="string">b"P1 6 2\n011011101101"</span>;
<span class="kw">let</span> <span class="ident">decoder</span> <span class="op">=</span> <span class="ident">PNMDecoder</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">pbmbinary</span>[..]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">colortype</span>(), <span class="ident">ColorType</span>::<span class="ident">Gray</span>(<span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">dimensions</span>(), (<span class="number">6</span>, <span class="number">2</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">subtype</span>(), <span class="ident">PNMSubtype</span>::<span class="ident">Bitmap</span>(<span class="ident">SampleEncoding</span>::<span class="ident">Ascii</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">read_image</span>().<span class="ident">unwrap</span>(), <span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>]);
<span class="kw">match</span> <span class="ident">PNMDecoder</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">pbmbinary</span>[..]).<span class="ident">unwrap</span>().<span class="ident">into_inner</span>() {
(
<span class="kw">_</span>,
<span class="ident">PNMHeader</span> {
<span class="ident">decoded</span>:
<span class="ident">HeaderRecord</span>::<span class="ident">Bitmap</span>(<span class="ident">BitmapHeader</span> {
<span class="ident">encoding</span>: <span class="ident">SampleEncoding</span>::<span class="ident">Ascii</span>,
<span class="ident">width</span>: <span class="number">6</span>,
<span class="ident">height</span>: <span class="number">2</span>,
}),
<span class="ident">encoded</span>: <span class="kw">_</span>,
},
) <span class="op">=</span><span class="op">></span> (),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Decoded header is incorrect"</span>),
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">pgm_binary</span>() {
<span class="comment">// The data contains two rows of the image (each line is padded to the full byte). For</span>
<span class="comment">// comments on its format, see documentation of `impl SampleType for PbmBit`.</span>
<span class="kw">let</span> <span class="ident">elements</span> <span class="op">=</span> (<span class="number">0</span>..<span class="number">16</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">pbmbinary</span> <span class="op">=</span> [<span class="kw-2">&</span><span class="string">b"P5 4 4 255\n"</span>[..], <span class="kw-2">&</span><span class="ident">elements</span>].<span class="ident">concat</span>();
<span class="kw">let</span> <span class="ident">decoder</span> <span class="op">=</span> <span class="ident">PNMDecoder</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">pbmbinary</span>[..]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">colortype</span>(), <span class="ident">ColorType</span>::<span class="ident">Gray</span>(<span class="number">8</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">dimensions</span>(), (<span class="number">4</span>, <span class="number">4</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">decoder</span>.<span class="ident">subtype</span>(),
<span class="ident">PNMSubtype</span>::<span class="ident">Graymap</span>(<span class="ident">SampleEncoding</span>::<span class="ident">Binary</span>)
);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">read_image</span>().<span class="ident">unwrap</span>(), <span class="ident">elements</span>);
<span class="kw">match</span> <span class="ident">PNMDecoder</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">pbmbinary</span>[..]).<span class="ident">unwrap</span>().<span class="ident">into_inner</span>() {
(
<span class="kw">_</span>,
<span class="ident">PNMHeader</span> {
<span class="ident">decoded</span>:
<span class="ident">HeaderRecord</span>::<span class="ident">Graymap</span>(<span class="ident">GraymapHeader</span> {
<span class="ident">encoding</span>: <span class="ident">SampleEncoding</span>::<span class="ident">Binary</span>,
<span class="ident">width</span>: <span class="number">4</span>,
<span class="ident">height</span>: <span class="number">4</span>,
<span class="ident">maxwhite</span>: <span class="number">255</span>,
}),
<span class="ident">encoded</span>: <span class="kw">_</span>,
},
) <span class="op">=</span><span class="op">></span> (),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Decoded header is incorrect"</span>),
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">pgm_ascii</span>() {
<span class="comment">// The data contains two rows of the image (each line is padded to the full byte). For</span>
<span class="comment">// comments on its format, see documentation of `impl SampleType for PbmBit`.</span>
<span class="kw">let</span> <span class="ident">pbmbinary</span> <span class="op">=</span> <span class="string">b"P2 4 4 255\n 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15"</span>;
<span class="kw">let</span> <span class="ident">decoder</span> <span class="op">=</span> <span class="ident">PNMDecoder</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">pbmbinary</span>[..]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">colortype</span>(), <span class="ident">ColorType</span>::<span class="ident">Gray</span>(<span class="number">8</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">dimensions</span>(), (<span class="number">4</span>, <span class="number">4</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">decoder</span>.<span class="ident">subtype</span>(),
<span class="ident">PNMSubtype</span>::<span class="ident">Graymap</span>(<span class="ident">SampleEncoding</span>::<span class="ident">Ascii</span>)
);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoder</span>.<span class="ident">read_image</span>().<span class="ident">unwrap</span>(), (<span class="number">0</span>..<span class="number">16</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span><span class="op">></span>());
<span class="kw">match</span> <span class="ident">PNMDecoder</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">pbmbinary</span>[..]).<span class="ident">unwrap</span>().<span class="ident">into_inner</span>() {
(
<span class="kw">_</span>,
<span class="ident">PNMHeader</span> {
<span class="ident">decoded</span>:
<span class="ident">HeaderRecord</span>::<span class="ident">Graymap</span>(<span class="ident">GraymapHeader</span> {
<span class="ident">encoding</span>: <span class="ident">SampleEncoding</span>::<span class="ident">Ascii</span>,
<span class="ident">width</span>: <span class="number">4</span>,
<span class="ident">height</span>: <span class="number">4</span>,
<span class="ident">maxwhite</span>: <span class="number">255</span>,
}),
<span class="ident">encoded</span>: <span class="kw">_</span>,
},
) <span class="op">=</span><span class="op">></span> (),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Decoded header is incorrect"</span>),
}
}
}
</pre></div>
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