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19 lines
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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_refPrefix() : Requires v1.4.0+ Reference a prefix (single-usage dictionary) to decompress next frame. This is the reverse operation of ZSTD_CCtx_refPrefix(), and must use the same prefix as the one used during compression. Prefix is only used once. Reference is discarded at end of frame. End of frame is reached when ZSTD_decompressStream() returns 0. @result : 0, or an error code (which can be tested with ZSTD_isError()). Note 1 : Adding any prefix (including NULL) invalidates any previously set prefix or dictionary Note 2 : Prefix buffer is referenced. It must outlive decompression. Prefix buffer must remain unmodified up to the end of frame, reached when ZSTD_decompressStream() returns 0. Note 3 : By default, the prefix is treated as raw content (ZSTD_dct_rawContent). Use ZSTD_CCtx_refPrefix_advanced() to alter dictMode (Experimental section) Note 4 : Referencing a raw content prefix has almost no cpu nor memory cost. A full dictionary is more costly, as it requires building tables."><meta name="keywords" content="rust, rustlang, rust-lang, ZSTD_DCtx_refPrefix"><title>ZSTD_DCtx_refPrefix in zstd_sys - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Semibold.ttf.woff2"><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="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script src="../crates.js"></script><script defer src="../main.js"></script>
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</a><div class="sidebar-elems"><h2 class="location">Other items in<br><a href="index.html">zstd_sys</a></h2><div id="sidebar-vars" data-name="ZSTD_DCtx_refPrefix" data-ty="fn" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../zstd_sys/index.html"><img class="rust-logo" src="../rust-logo.png" alt="logo"></a><nav class="sub"><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../brush.svg"></button><div id="theme-choices" role="menu"></div></div><form class="search-form"><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><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../wheel.svg"></a></div></form></nav></div><section id="main-content" class="content"><h1 class="fqn"><span class="in-band">Function <a href="index.html">zstd_sys</a>::<wbr><a class="fn" href="#">ZSTD_DCtx_refPrefix</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span><a class="srclink" href="../src/zstd_sys/bindings_std.rs.html#922-926" title="goto source code">[src]</a></span></h1><div class="docblock item-decl"><pre class="rust fn"><code>pub unsafe extern "C" fn ZSTD_DCtx_refPrefix(<br> dctx: <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.pointer.html">*mut </a><a class="type" href="type.ZSTD_DCtx.html" title="type zstd_sys::ZSTD_DCtx">ZSTD_DCtx</a>, <br> prefix: <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.pointer.html">*const </a><a class="enum" href="https://doc.rust-lang.org/1.59.0/core/ffi/enum.c_void.html" title="enum core::ffi::c_void">c_void</a>, <br> prefixSize: <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.usize.html">usize</a><br>) -> <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.usize.html">usize</a></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>ZSTD_DCtx_refPrefix() : Requires v1.4.0+
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Reference a prefix (single-usage dictionary) to decompress next frame.
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This is the reverse operation of ZSTD_CCtx_refPrefix(),
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and must use the same prefix as the one used during compression.
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Prefix is <strong>only used once</strong>. Reference is discarded at end of frame.
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End of frame is reached when ZSTD_decompressStream() returns 0.
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@result : 0, or an error code (which can be tested with ZSTD_isError()).
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Note 1 : Adding any prefix (including NULL) invalidates any previously set prefix or dictionary
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Note 2 : Prefix buffer is referenced. It <strong>must</strong> outlive decompression.
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Prefix buffer must remain unmodified up to the end of frame,
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reached when ZSTD_decompressStream() returns 0.
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Note 3 : By default, the prefix is treated as raw content (ZSTD_dct_rawContent).
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Use ZSTD_CCtx_refPrefix_advanced() to alter dictMode (Experimental section)
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Note 4 : Referencing a raw content prefix has almost no cpu nor memory cost.
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A full dictionary is more costly, as it requires building tables.</p>
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