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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="Source of the Rust file `crates/abi/src/utils.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>utils.rs - source</title><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="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings" ></script><script src="../../storage.js"></script><script src="../../crates.js"></script><script defer src="../../main.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script>
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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">fe_common::utils::keccak</span>;
<span class="doccomment">/// Formats the name and fields and calculates the 32 byte keccak256 value of</span>
<span class="doccomment">/// the signature.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">event_topic</span>(<span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">fields</span>: <span class="kw-2">&</span>[<span class="ident">String</span>]) -> <span class="ident">String</span> {
<span class="ident">hash_signature</span>(<span class="ident">name</span>, <span class="ident">fields</span>, <span class="number">32</span>)
}
<span class="doccomment">/// Formats the name and params and calculates the 4 byte keccak256 value of the</span>
<span class="doccomment">/// signature.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">func_selector</span>(<span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">params</span>: <span class="kw-2">&</span>[<span class="ident">String</span>]) -> <span class="ident">String</span> {
<span class="ident">hash_signature</span>(<span class="ident">name</span>, <span class="ident">params</span>, <span class="number">4</span>)
}
<span class="kw">fn</span> <span class="ident">hash_signature</span>(<span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">params</span>: <span class="kw-2">&</span>[<span class="ident">String</span>], <span class="ident">size</span>: <span class="ident">usize</span>) -> <span class="ident">String</span> {
<span class="kw">let</span> <span class="ident">signature</span> <span class="op">=</span> <span class="macro">format!</span>(<span class="string">"{}({})"</span>, <span class="ident">name</span>, <span class="ident">params</span>.<span class="ident">join</span>(<span class="string">","</span>));
<span class="ident">keccak::partial</span>(<span class="ident">signature</span>.<span class="ident">as_bytes</span>(), <span class="ident">size</span>)
}
</code></pre></div>
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