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</pre><pre class="rust">
<span class="comment">// This was originally based on code from: https://github.com/nwin/lzw</span>
<span class="comment">// Copyright (c) 2015 nwin</span>
<span class="comment">// which is under both Apache 2.0 and MIT</span>
<span class="doccomment">//! This module provides a bit writer</span>
<span class="kw">use</span> <span class="ident">std::io</span>::{<span class="self">self</span>, <span class="ident">Write</span>};
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"64"</span>)]</span>
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">mod</span> <span class="ident">arch_dep</span> {
<span class="doccomment">/// The data type of the accumulator.</span>
<span class="doccomment">/// a 64-bit value allows us to store more before</span>
<span class="doccomment">/// each push to the vector, but is sub-optimal</span>
<span class="doccomment">/// on 32-bit platforms.</span>
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">AccType</span> <span class="op">=</span> <span class="ident">u64</span>;
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">FLUSH_AT</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">48</span>;
<span class="doccomment">/// Push pending bits to vector.</span>
<span class="doccomment">/// Using a macro here since an inline function.</span>
<span class="doccomment">/// didn't optimise properly.</span>
<span class="doccomment">/// TODO June 2019: See if it's still needed.</span>
<span class="macro">macro_rules!</span> <span class="ident">push</span>{
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">s</span>:<span class="ident">ident</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">s</span>.<span class="ident">w</span>.<span class="ident">extend_from_slice</span>(<span class="kw-2">&</span>[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">s</span>.<span class="ident">acc</span> <span class="kw">as</span> <span class="ident">u8</span>,
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">s</span>.<span class="ident">acc</span> <span class="op">></span><span class="op">></span> <span class="number">8</span>) <span class="kw">as</span> <span class="ident">u8</span>,
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">s</span>.<span class="ident">acc</span> <span class="op">></span><span class="op">></span> <span class="number">16</span>) <span class="kw">as</span> <span class="ident">u8</span>,
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">s</span>.<span class="ident">acc</span> <span class="op">></span><span class="op">></span> <span class="number">24</span>) <span class="kw">as</span> <span class="ident">u8</span>,
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">s</span>.<span class="ident">acc</span> <span class="op">></span><span class="op">></span> <span class="number">32</span>) <span class="kw">as</span> <span class="ident">u8</span>,
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">s</span>.<span class="ident">acc</span> <span class="op">></span><span class="op">></span> <span class="number">40</span>) <span class="kw">as</span> <span class="ident">u8</span>
][..])
};
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"64"</span>))]</span>
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">mod</span> <span class="ident">arch_dep</span> {
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">AccType</span> <span class="op">=</span> <span class="ident">u32</span>;
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">FLUSH_AT</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">16</span>;
<span class="macro">macro_rules!</span> <span class="ident">push</span>{
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">s</span>:<span class="ident">ident</span>) <span class="op">=</span><span class="op">></span> {
<span class="comment">// Unlike the 64-bit case, using copy_from_slice seemed to worsen performance here.</span>
<span class="comment">// TODO: Needs benching on a 32-bit system to see what works best.</span>
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">s</span>.<span class="ident">w</span>.<span class="ident">push</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">s</span>.<span class="ident">acc</span> <span class="kw">as</span> <span class="ident">u8</span>);
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">s</span>.<span class="ident">w</span>.<span class="ident">push</span>((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">s</span>.<span class="ident">acc</span> <span class="op">></span><span class="op">></span> <span class="number">8</span>) <span class="kw">as</span> <span class="ident">u8</span>);
};
}
}
<span class="kw">use</span> <span class="self">self</span><span class="ident">::arch_dep</span>::<span class="kw-2">*</span>;
<span class="doccomment">/// Writes bits to a byte stream, LSB first.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">LsbWriter</span> {
<span class="comment">// Public for now so it can be replaced after initialization.</span>
<span class="kw">pub</span> <span class="ident">w</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>,
<span class="ident">bits</span>: <span class="ident">u8</span>,
<span class="ident">acc</span>: <span class="ident">AccType</span>,
}
<span class="kw">impl</span> <span class="ident">LsbWriter</span> {
<span class="doccomment">/// Creates a new bit reader</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">writer</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="ident">LsbWriter</span> {
<span class="ident">LsbWriter</span> {
<span class="ident">w</span>: <span class="ident">writer</span>,
<span class="ident">bits</span>: <span class="number">0</span>,
<span class="ident">acc</span>: <span class="number">0</span>,
}
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pending_bits</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">u8</span> {
<span class="self">self</span>.<span class="ident">bits</span>
}
<span class="doccomment">/// Buffer n number of bits, and write them to the vec if there are enough pending bits.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">write_bits</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">v</span>: <span class="ident">u16</span>, <span class="ident">n</span>: <span class="ident">u8</span>) {
<span class="comment">// NOTE: This outputs garbage data if n is 0, but v is not 0</span>
<span class="self">self</span>.<span class="ident">acc</span> <span class="op">|</span><span class="op">=</span> (<span class="ident">v</span> <span class="kw">as</span> <span class="ident">AccType</span>) <span class="op"><</span><span class="op"><</span> <span class="self">self</span>.<span class="ident">bits</span>;
<span class="self">self</span>.<span class="ident">bits</span> <span class="op">+</span><span class="op">=</span> <span class="ident">n</span>;
<span class="comment">// Waiting until we have FLUSH_AT bits and pushing them all in one batch.</span>
<span class="kw">while</span> <span class="self">self</span>.<span class="ident">bits</span> <span class="op">></span><span class="op">=</span> <span class="ident">FLUSH_AT</span> {
<span class="macro">push!</span>(<span class="self">self</span>);
<span class="self">self</span>.<span class="ident">acc</span> <span class="op">></span><span class="op">></span><span class="op">=</span> <span class="ident">FLUSH_AT</span>;
<span class="self">self</span>.<span class="ident">bits</span> <span class="op">-</span><span class="op">=</span> <span class="ident">FLUSH_AT</span>;
}
}
<span class="kw">fn</span> <span class="ident">write_bits_finish</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">v</span>: <span class="ident">u16</span>, <span class="ident">n</span>: <span class="ident">u8</span>) {
<span class="comment">// NOTE: This outputs garbage data if n is 0, but v is not 0</span>
<span class="self">self</span>.<span class="ident">acc</span> <span class="op">|</span><span class="op">=</span> (<span class="ident">v</span> <span class="kw">as</span> <span class="ident">AccType</span>) <span class="op"><</span><span class="op"><</span> <span class="self">self</span>.<span class="ident">bits</span>;
<span class="self">self</span>.<span class="ident">bits</span> <span class="op">+</span><span class="op">=</span> <span class="ident">n</span> <span class="op">%</span> <span class="number">8</span>;
<span class="kw">while</span> <span class="self">self</span>.<span class="ident">bits</span> <span class="op">></span><span class="op">=</span> <span class="number">8</span> {
<span class="self">self</span>.<span class="ident">w</span>.<span class="ident">push</span>(<span class="self">self</span>.<span class="ident">acc</span> <span class="kw">as</span> <span class="ident">u8</span>);
<span class="self">self</span>.<span class="ident">acc</span> <span class="op">></span><span class="op">></span><span class="op">=</span> <span class="number">8</span>;
<span class="self">self</span>.<span class="ident">bits</span> <span class="op">-</span><span class="op">=</span> <span class="number">8</span>;
}
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">flush_raw</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw">let</span> <span class="ident">missing</span> <span class="op">=</span> <span class="ident">FLUSH_AT</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">bits</span>;
<span class="comment">// Have to test for self.bits > 0 here,</span>
<span class="comment">// otherwise flush would output an extra byte when flush was called at a byte boundary</span>
<span class="kw">if</span> <span class="ident">missing</span> <span class="op">></span> <span class="number">0</span> <span class="op">&&</span> <span class="self">self</span>.<span class="ident">bits</span> <span class="op">></span> <span class="number">0</span> {
<span class="self">self</span>.<span class="ident">write_bits_finish</span>(<span class="number">0</span>, <span class="ident">missing</span>);
}
}
}
<span class="kw">impl</span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">LsbWriter</span> {
<span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="ident">io::Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">acc</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
<span class="self">self</span>.<span class="ident">w</span>.<span class="ident">extend_from_slice</span>(<span class="ident">buf</span>)
} <span class="kw">else</span> {
<span class="kw">for</span> <span class="kw-2">&</span><span class="ident">byte</span> <span class="kw">in</span> <span class="ident">buf</span>.<span class="ident">iter</span>() {
<span class="self">self</span>.<span class="ident">write_bits</span>(<span class="ident">byte</span> <span class="kw">as</span> <span class="ident">u16</span>, <span class="number">8</span>)
}
}
<span class="prelude-val">Ok</span>(<span class="ident">buf</span>.<span class="ident">len</span>())
}
<span class="kw">fn</span> <span class="ident">flush</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">io::Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="self">self</span>.<span class="ident">flush_raw</span>();
<span class="prelude-val">Ok</span>(())
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">test</span> {
<span class="kw">use</span> <span class="kw">super</span><span class="ident">::LsbWriter</span>;
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">write_bits</span>() {
<span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span> [
(<span class="number">3</span>, <span class="number">3</span>),
(<span class="number">10</span>, <span class="number">8</span>),
(<span class="number">88</span>, <span class="number">7</span>),
(<span class="number">0</span>, <span class="number">2</span>),
(<span class="number">0</span>, <span class="number">5</span>),
(<span class="number">0</span>, <span class="number">0</span>),
(<span class="number">238</span>, <span class="number">8</span>),
(<span class="number">126</span>, <span class="number">8</span>),
(<span class="number">161</span>, <span class="number">8</span>),
(<span class="number">10</span>, <span class="number">8</span>),
(<span class="number">238</span>, <span class="number">8</span>),
(<span class="number">174</span>, <span class="number">8</span>),
(<span class="number">126</span>, <span class="number">8</span>),
(<span class="number">174</span>, <span class="number">8</span>),
(<span class="number">65</span>, <span class="number">8</span>),
(<span class="number">142</span>, <span class="number">8</span>),
(<span class="number">62</span>, <span class="number">8</span>),
(<span class="number">10</span>, <span class="number">8</span>),
(<span class="number">1</span>, <span class="number">8</span>),
(<span class="number">161</span>, <span class="number">8</span>),
(<span class="number">78</span>, <span class="number">8</span>),
(<span class="number">62</span>, <span class="number">8</span>),
(<span class="number">158</span>, <span class="number">8</span>),
(<span class="number">206</span>, <span class="number">8</span>),
(<span class="number">10</span>, <span class="number">8</span>),
(<span class="number">64</span>, <span class="number">7</span>),
(<span class="number">0</span>, <span class="number">0</span>),
(<span class="number">24</span>, <span class="number">5</span>),
(<span class="number">0</span>, <span class="number">0</span>),
(<span class="number">174</span>, <span class="number">8</span>),
(<span class="number">126</span>, <span class="number">8</span>),
(<span class="number">193</span>, <span class="number">8</span>),
(<span class="number">174</span>, <span class="number">8</span>),
];
<span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> [
<span class="number">83</span>,
<span class="number">192</span>,
<span class="number">2</span>,
<span class="number">220</span>,
<span class="number">253</span>,
<span class="number">66</span>,
<span class="number">21</span>,
<span class="number">220</span>,
<span class="number">93</span>,
<span class="number">253</span>,
<span class="number">92</span>,
<span class="number">131</span>,
<span class="number">28</span>,
<span class="number">125</span>,
<span class="number">20</span>,
<span class="number">2</span>,
<span class="number">66</span>,
<span class="number">157</span>,
<span class="number">124</span>,
<span class="number">60</span>,
<span class="number">157</span>,
<span class="number">21</span>,
<span class="number">128</span>,
<span class="number">216</span>,
<span class="number">213</span>,
<span class="number">47</span>,
<span class="number">216</span>,
<span class="number">21</span>,
];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">writer</span> <span class="op">=</span> <span class="ident">LsbWriter::new</span>(<span class="ident">Vec::new</span>());
<span class="kw">for</span> <span class="ident">v</span> <span class="kw">in</span> <span class="ident">input</span>.<span class="ident">iter</span>() {
<span class="ident">writer</span>.<span class="ident">write_bits</span>(<span class="ident">v</span>.<span class="number">0</span>, <span class="ident">v</span>.<span class="number">1</span>);
}
<span class="ident">writer</span>.<span class="ident">flush_raw</span>();
<span class="macro">assert_eq!</span>(<span class="ident">writer</span>.<span class="ident">w</span>, <span class="ident">expected</span>);
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">test</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"benchmarks"</span>))]</span>
<span class="kw">mod</span> <span class="ident">bench</span> {
<span class="kw">use</span> <span class="ident">test_std::Bencher</span>;
<span class="kw">use</span> <span class="kw">super</span><span class="ident">::LsbWriter</span>;
<span class="attribute">#[<span class="ident">bench</span>]</span>
<span class="kw">fn</span> <span class="ident">bit_writer</span>(<span class="ident">b</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Bencher</span>) {
<span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span> [
(<span class="number">3</span>, <span class="number">3</span>),
(<span class="number">10</span>, <span class="number">8</span>),
(<span class="number">88</span>, <span class="number">7</span>),
(<span class="number">0</span>, <span class="number">2</span>),
(<span class="number">0</span>, <span class="number">5</span>),
(<span class="number">0</span>, <span class="number">0</span>),
(<span class="number">238</span>, <span class="number">8</span>),
(<span class="number">126</span>, <span class="number">8</span>),
(<span class="number">161</span>, <span class="number">8</span>),
(<span class="number">10</span>, <span class="number">8</span>),
(<span class="number">238</span>, <span class="number">8</span>),
(<span class="number">174</span>, <span class="number">8</span>),
(<span class="number">126</span>, <span class="number">8</span>),
(<span class="number">174</span>, <span class="number">8</span>),
(<span class="number">65</span>, <span class="number">8</span>),
(<span class="number">142</span>, <span class="number">8</span>),
(<span class="number">62</span>, <span class="number">8</span>),
(<span class="number">10</span>, <span class="number">8</span>),
(<span class="number">1</span>, <span class="number">8</span>),
(<span class="number">161</span>, <span class="number">8</span>),
(<span class="number">78</span>, <span class="number">8</span>),
(<span class="number">62</span>, <span class="number">8</span>),
(<span class="number">158</span>, <span class="number">8</span>),
(<span class="number">206</span>, <span class="number">8</span>),
(<span class="number">10</span>, <span class="number">8</span>),
(<span class="number">64</span>, <span class="number">7</span>),
(<span class="number">0</span>, <span class="number">0</span>),
(<span class="number">24</span>, <span class="number">5</span>),
(<span class="number">0</span>, <span class="number">0</span>),
(<span class="number">174</span>, <span class="number">8</span>),
(<span class="number">126</span>, <span class="number">8</span>),
(<span class="number">193</span>, <span class="number">8</span>),
(<span class="number">174</span>, <span class="number">8</span>),
];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">writer</span> <span class="op">=</span> <span class="ident">LsbWriter::new</span>(<span class="ident">Vec::with_capacity</span>(<span class="number">100</span>));
<span class="ident">b</span>.<span class="ident">iter</span>(<span class="op">|</span><span class="op">|</span> <span class="kw">for</span> <span class="ident">v</span> <span class="kw">in</span> <span class="ident">input</span>.<span class="ident">iter</span>() {
<span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">writer</span>.<span class="ident">write_bits</span>(<span class="ident">v</span>.<span class="number">0</span>, <span class="ident">v</span>.<span class="number">1</span>);
});
}
}
</pre></div>
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