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<!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="ZSTD_DCtx_refDDict() : Requires v1.4.0+ Reference a prepared dictionary, to be used to decompress next frames. The dictionary remains active for decompression of future frames using same DCtx."><title>ZSTD_DCtx_refDDict in zstd_sys - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="zstd_sys" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../static.files/storage-e2aeef58.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-044be391.svg"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">ZSTD_DCtx_refDDict</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../zstd_sys/index.html">zstd_<wbr>sys</a><span class="version">2.0.16+zstd.1.5.7</span></h2></div><div class="sidebar-elems"><div id="rustdoc-modnav"></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="index.html">zstd_sys</a></div><h1>Function <span class="fn">ZSTD_<wbr>DCtx_<wbr>refD<wbr>Dict</span> <button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../src/zstd_sys/bindings_zstd.rs.html#597-600">Source</a> </span></div><pre class="rust item-decl"><code>pub unsafe extern "C" fn ZSTD_DCtx_refDDict(
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dctx: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.pointer.html">*mut </a><a class="type" href="type.ZSTD_DCtx.html" title="type zstd_sys::ZSTD_DCtx">ZSTD_DCtx</a>,
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ddict: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.pointer.html">*const </a><a class="type" href="type.ZSTD_DDict.html" title="type zstd_sys::ZSTD_DDict">ZSTD_DDict</a>,
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) -> <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.usize.html">usize</a></code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>ZSTD_DCtx_refDDict() : Requires v1.4.0+
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Reference a prepared dictionary, to be used to decompress next frames.
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The dictionary remains active for decompression of future frames using same DCtx.</p>
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<p>If called with ZSTD_d_refMultipleDDicts enabled, repeated calls of this function
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will store the DDict references in a table, and the DDict used for decompression
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will be determined at decompression time, as per the dict ID in the frame.
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The memory for the table is allocated on the first call to refDDict, and can be
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freed with ZSTD_freeDCtx().</p>
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<p>If called with ZSTD_d_refMultipleDDicts disabled (the default), only one dictionary
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will be managed, and referencing a dictionary effectively “discards” any previous one.</p>
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<p>@result : 0, or an error code (which can be tested with ZSTD_isError()).
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Special: referencing a NULL DDict means “return to no-dictionary mode”.
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Note 2 : DDict is just referenced, its lifetime must outlive its usage from DCtx.</p>
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</div></details></section></div></main></body></html> |