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</pre><pre class="rust"><code><span class="doccomment">//! Buffer wrappers implementing default so we can allocate the buffers with `Box::default()`
//! to avoid stack copies. Box::new() doesn&#39;t at the moment, and using a vec means we would lose
//! static length info.
</span><span class="kw">use </span><span class="kw">crate</span>::deflate::core::{LZ_DICT_SIZE, MAX_MATCH_LEN};
<span class="doccomment">/// Size of the buffer of lz77 encoded data.
</span><span class="kw">pub const </span>LZ_CODE_BUF_SIZE: usize = <span class="number">64 </span>* <span class="number">1024</span>;
<span class="doccomment">/// Size of the output buffer.
</span><span class="kw">pub const </span>OUT_BUF_SIZE: usize = (LZ_CODE_BUF_SIZE * <span class="number">13</span>) / <span class="number">10</span>;
<span class="kw">pub const </span>LZ_DICT_FULL_SIZE: usize = LZ_DICT_SIZE + MAX_MATCH_LEN - <span class="number">1 </span>+ <span class="number">1</span>;
<span class="doccomment">/// Size of hash values in the hash chains.
</span><span class="kw">pub const </span>LZ_HASH_BITS: i32 = <span class="number">15</span>;
<span class="doccomment">/// How many bits to shift when updating the current hash value.
</span><span class="kw">pub const </span>LZ_HASH_SHIFT: i32 = (LZ_HASH_BITS + <span class="number">2</span>) / <span class="number">3</span>;
<span class="doccomment">/// Size of the chained hash tables.
</span><span class="kw">pub const </span>LZ_HASH_SIZE: usize = <span class="number">1 </span>&lt;&lt; LZ_HASH_BITS;
<span class="attribute">#[inline]
</span><span class="kw">pub fn </span>update_hash(current_hash: u16, byte: u8) -&gt; u16 {
((current_hash &lt;&lt; LZ_HASH_SHIFT) ^ u16::from(byte)) &amp; (LZ_HASH_SIZE <span class="kw">as </span>u16 - <span class="number">1</span>)
}
<span class="kw">pub struct </span>HashBuffers {
<span class="kw">pub </span>dict: [u8; LZ_DICT_FULL_SIZE],
<span class="kw">pub </span>next: [u16; LZ_DICT_SIZE],
<span class="kw">pub </span>hash: [u16; LZ_DICT_SIZE],
}
<span class="kw">impl </span>HashBuffers {
<span class="attribute">#[inline]
</span><span class="kw">pub fn </span>reset(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
<span class="kw-2">*</span><span class="self">self </span>= HashBuffers::default();
}
}
<span class="kw">impl </span>Default <span class="kw">for </span>HashBuffers {
<span class="kw">fn </span>default() -&gt; HashBuffers {
HashBuffers {
dict: [<span class="number">0</span>; LZ_DICT_FULL_SIZE],
next: [<span class="number">0</span>; LZ_DICT_SIZE],
hash: [<span class="number">0</span>; LZ_DICT_SIZE],
}
}
}
<span class="kw">pub struct </span>LocalBuf {
<span class="kw">pub </span>b: [u8; OUT_BUF_SIZE],
}
<span class="kw">impl </span>Default <span class="kw">for </span>LocalBuf {
<span class="kw">fn </span>default() -&gt; LocalBuf {
LocalBuf {
b: [<span class="number">0</span>; OUT_BUF_SIZE],
}
}
}
</code></pre></div>
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