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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_compress2() : Behave the same as ZSTD_compressCCtx(), but compression parameters are set using the advanced API. ZSTD_compress2() always starts a new frame. Should cctx hold data from a previously unfinished frame, everything about it is forgotten."><meta name="keywords" content="rust, rustlang, rust-lang, ZSTD_compress2"><title>ZSTD_compress2 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_compress2" 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_compress2</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#453-459" title="goto source code">[src]</a></span></h1><div class="docblock item-decl"><pre class="rust fn"><code>pub unsafe extern "C" fn ZSTD_compress2(<br> cctx: <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.pointer.html">*mut </a><a class="type" href="type.ZSTD_CCtx.html" title="type zstd_sys::ZSTD_CCtx">ZSTD_CCtx</a>, <br> dst: <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.pointer.html">*mut </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> dstCapacity: <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.usize.html">usize</a>, <br> src: <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> srcSize: <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_compress2() :
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Behave the same as ZSTD_compressCCtx(), but compression parameters are set using the advanced API.
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ZSTD_compress2() always starts a new frame.
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Should cctx hold data from a previously unfinished frame, everything about it is forgotten.</p>
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<ul>
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<li>Compression parameters are pushed into CCtx before starting compression, using ZSTD_CCtx_set*()</li>
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<li>The function is always blocking, returns when compression is completed.
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Hint : compression runs faster if <code>dstCapacity</code> >= <code>ZSTD_compressBound(srcSize)</code>.
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@return : compressed size written into <code>dst</code> (<= `dstCapacity),
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or an error code if it fails (which can be tested using ZSTD_isError()).</li>
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</ul>
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