| <!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 `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/base64-0.13.1/src/chunked_encoder.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>chunked_encoder.rs - source</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" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../base64/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../base64/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use crate</span>::{ |
| encode::{add_padding, encode_to_slice}, |
| Config, |
| }; |
| <span class="attribute">#[cfg(any(feature = <span class="string">"alloc"</span>, feature = <span class="string">"std"</span>, test))] |
| </span><span class="kw">use </span>alloc::string::String; |
| <span class="kw">use </span>core::cmp; |
| <span class="attribute">#[cfg(any(feature = <span class="string">"alloc"</span>, feature = <span class="string">"std"</span>, test))] |
| </span><span class="kw">use </span>core::str; |
| |
| <span class="doccomment">/// The output mechanism for ChunkedEncoder's encoded bytes. |
| </span><span class="kw">pub trait </span>Sink { |
| <span class="kw">type </span>Error; |
| |
| <span class="doccomment">/// Handle a chunk of encoded base64 data (as UTF-8 bytes) |
| </span><span class="kw">fn </span>write_encoded_bytes(<span class="kw-2">&mut </span><span class="self">self</span>, encoded: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>; |
| } |
| |
| <span class="kw">const </span>BUF_SIZE: usize = <span class="number">1024</span>; |
| |
| <span class="doccomment">/// A base64 encoder that emits encoded bytes in chunks without heap allocation. |
| </span><span class="kw">pub struct </span>ChunkedEncoder { |
| config: Config, |
| max_input_chunk_len: usize, |
| } |
| |
| <span class="kw">impl </span>ChunkedEncoder { |
| <span class="kw">pub fn </span>new(config: Config) -> ChunkedEncoder { |
| ChunkedEncoder { |
| config, |
| max_input_chunk_len: max_input_length(BUF_SIZE, config), |
| } |
| } |
| |
| <span class="kw">pub fn </span>encode<S: Sink>(<span class="kw-2">&</span><span class="self">self</span>, bytes: <span class="kw-2">&</span>[u8], sink: <span class="kw-2">&mut </span>S) -> <span class="prelude-ty">Result</span><(), S::Error> { |
| <span class="kw">let </span><span class="kw-2">mut </span>encode_buf: [u8; BUF_SIZE] = [<span class="number">0</span>; BUF_SIZE]; |
| <span class="kw">let </span>encode_table = <span class="self">self</span>.config.char_set.encode_table(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>input_index = <span class="number">0</span>; |
| |
| <span class="kw">while </span>input_index < bytes.len() { |
| <span class="comment">// either the full input chunk size, or it's the last iteration |
| </span><span class="kw">let </span>input_chunk_len = cmp::min(<span class="self">self</span>.max_input_chunk_len, bytes.len() - input_index); |
| |
| <span class="kw">let </span>chunk = <span class="kw-2">&</span>bytes[input_index..(input_index + input_chunk_len)]; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>b64_bytes_written = encode_to_slice(chunk, <span class="kw-2">&mut </span>encode_buf, encode_table); |
| |
| input_index += input_chunk_len; |
| <span class="kw">let </span>more_input_left = input_index < bytes.len(); |
| |
| <span class="kw">if </span><span class="self">self</span>.config.pad && !more_input_left { |
| <span class="comment">// no more input, add padding if needed. Buffer will have room because |
| // max_input_length leaves room for it. |
| </span>b64_bytes_written += add_padding(bytes.len(), <span class="kw-2">&mut </span>encode_buf[b64_bytes_written..]); |
| } |
| |
| sink.write_encoded_bytes(<span class="kw-2">&</span>encode_buf[<span class="number">0</span>..b64_bytes_written])<span class="question-mark">?</span>; |
| } |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="doccomment">/// Calculate the longest input that can be encoded for the given output buffer size. |
| /// |
| /// If the config requires padding, two bytes of buffer space will be set aside so that the last |
| /// chunk of input can be encoded safely. |
| /// |
| /// The input length will always be a multiple of 3 so that no encoding state has to be carried over |
| /// between chunks. |
| </span><span class="kw">fn </span>max_input_length(encoded_buf_len: usize, config: Config) -> usize { |
| <span class="kw">let </span>effective_buf_len = <span class="kw">if </span>config.pad { |
| <span class="comment">// make room for padding |
| </span>encoded_buf_len |
| .checked_sub(<span class="number">2</span>) |
| .expect(<span class="string">"Don't use a tiny buffer"</span>) |
| } <span class="kw">else </span>{ |
| encoded_buf_len |
| }; |
| |
| <span class="comment">// No padding, so just normal base64 expansion. |
| </span>(effective_buf_len / <span class="number">4</span>) * <span class="number">3 |
| </span>} |
| |
| <span class="comment">// A really simple sink that just appends to a string |
| </span><span class="attribute">#[cfg(any(feature = <span class="string">"alloc"</span>, feature = <span class="string">"std"</span>, test))] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>StringSink<<span class="lifetime">'a</span>> { |
| string: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>String, |
| } |
| |
| <span class="attribute">#[cfg(any(feature = <span class="string">"alloc"</span>, feature = <span class="string">"std"</span>, test))] |
| </span><span class="kw">impl</span><<span class="lifetime">'a</span>> StringSink<<span class="lifetime">'a</span>> { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(s: <span class="kw-2">&mut </span>String) -> StringSink { |
| StringSink { string: s } |
| } |
| } |
| |
| <span class="attribute">#[cfg(any(feature = <span class="string">"alloc"</span>, feature = <span class="string">"std"</span>, test))] |
| </span><span class="kw">impl</span><<span class="lifetime">'a</span>> Sink <span class="kw">for </span>StringSink<<span class="lifetime">'a</span>> { |
| <span class="kw">type </span>Error = (); |
| |
| <span class="kw">fn </span>write_encoded_bytes(<span class="kw-2">&mut </span><span class="self">self</span>, s: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error> { |
| <span class="self">self</span>.string.push_str(str::from_utf8(s).unwrap()); |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">pub mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use crate</span>::{encode_config_buf, tests::random_config, CharacterSet, STANDARD}; |
| |
| <span class="kw">use </span>rand::{ |
| distributions::{Distribution, Uniform}, |
| FromEntropy, Rng, |
| }; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>chunked_encode_empty() { |
| <span class="macro">assert_eq!</span>(<span class="string">""</span>, chunked_encode_str(<span class="kw-2">&</span>[], STANDARD)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>chunked_encode_intermediate_fast_loop() { |
| <span class="comment">// > 8 bytes input, will enter the pretty fast loop |
| </span><span class="macro">assert_eq!</span>( |
| <span class="string">"Zm9vYmFyYmF6cXV4"</span>, |
| chunked_encode_str(<span class="string">b"foobarbazqux"</span>, STANDARD) |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>chunked_encode_fast_loop() { |
| <span class="comment">// > 32 bytes input, will enter the uber fast loop |
| </span><span class="macro">assert_eq!</span>( |
| <span class="string">"Zm9vYmFyYmF6cXV4cXV1eGNvcmdlZ3JhdWx0Z2FycGx5eg=="</span>, |
| chunked_encode_str(<span class="string">b"foobarbazquxquuxcorgegraultgarplyz"</span>, STANDARD) |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>chunked_encode_slow_loop_only() { |
| <span class="comment">// < 8 bytes input, slow loop only |
| </span><span class="macro">assert_eq!</span>(<span class="string">"Zm9vYmFy"</span>, chunked_encode_str(<span class="string">b"foobar"</span>, STANDARD)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>chunked_encode_matches_normal_encode_random_string_sink() { |
| <span class="kw">let </span>helper = StringSinkTestHelper; |
| chunked_encode_matches_normal_encode_random(<span class="kw-2">&</span>helper); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>max_input_length_no_pad() { |
| <span class="kw">let </span>config = config_with_pad(<span class="bool-val">false</span>); |
| <span class="macro">assert_eq!</span>(<span class="number">768</span>, max_input_length(<span class="number">1024</span>, config)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>max_input_length_with_pad_decrements_one_triple() { |
| <span class="kw">let </span>config = config_with_pad(<span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>(<span class="number">765</span>, max_input_length(<span class="number">1024</span>, config)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>max_input_length_with_pad_one_byte_short() { |
| <span class="kw">let </span>config = config_with_pad(<span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>(<span class="number">765</span>, max_input_length(<span class="number">1025</span>, config)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>max_input_length_with_pad_fits_exactly() { |
| <span class="kw">let </span>config = config_with_pad(<span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>(<span class="number">768</span>, max_input_length(<span class="number">1026</span>, config)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>max_input_length_cant_use_extra_single_encoded_byte() { |
| <span class="kw">let </span>config = Config::new(<span class="kw">crate</span>::CharacterSet::Standard, <span class="bool-val">false</span>); |
| <span class="macro">assert_eq!</span>(<span class="number">300</span>, max_input_length(<span class="number">401</span>, config)); |
| } |
| |
| <span class="kw">pub fn </span>chunked_encode_matches_normal_encode_random<S: SinkTestHelper>(sink_test_helper: <span class="kw-2">&</span>S) { |
| <span class="kw">let </span><span class="kw-2">mut </span>input_buf: Vec<u8> = Vec::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>output_buf = String::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>rng = rand::rngs::SmallRng::from_entropy(); |
| <span class="kw">let </span>input_len_range = Uniform::new(<span class="number">1</span>, <span class="number">10_000</span>); |
| |
| <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">5_000 </span>{ |
| input_buf.clear(); |
| output_buf.clear(); |
| |
| <span class="kw">let </span>buf_len = input_len_range.sample(<span class="kw-2">&mut </span>rng); |
| <span class="kw">for _ in </span><span class="number">0</span>..buf_len { |
| input_buf.push(rng.gen()); |
| } |
| |
| <span class="kw">let </span>config = random_config(<span class="kw-2">&mut </span>rng); |
| |
| <span class="kw">let </span>chunk_encoded_string = sink_test_helper.encode_to_string(config, <span class="kw-2">&</span>input_buf); |
| encode_config_buf(<span class="kw-2">&</span>input_buf, config, <span class="kw-2">&mut </span>output_buf); |
| |
| <span class="macro">assert_eq!</span>( |
| output_buf, chunk_encoded_string, |
| <span class="string">"input len={}, config: pad={}"</span>, |
| buf_len, config.pad |
| ); |
| } |
| } |
| |
| <span class="kw">fn </span>chunked_encode_str(bytes: <span class="kw-2">&</span>[u8], config: Config) -> String { |
| <span class="kw">let </span><span class="kw-2">mut </span>s = String::new(); |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>sink = StringSink::new(<span class="kw-2">&mut </span>s); |
| <span class="kw">let </span>encoder = ChunkedEncoder::new(config); |
| encoder.encode(bytes, <span class="kw-2">&mut </span>sink).unwrap(); |
| } |
| |
| <span class="kw">return </span>s; |
| } |
| |
| <span class="kw">fn </span>config_with_pad(pad: bool) -> Config { |
| Config::new(CharacterSet::Standard, pad) |
| } |
| |
| <span class="comment">// An abstraction around sinks so that we can have tests that easily to any sink implementation |
| </span><span class="kw">pub trait </span>SinkTestHelper { |
| <span class="kw">fn </span>encode_to_string(<span class="kw-2">&</span><span class="self">self</span>, config: Config, bytes: <span class="kw-2">&</span>[u8]) -> String; |
| } |
| |
| <span class="kw">struct </span>StringSinkTestHelper; |
| |
| <span class="kw">impl </span>SinkTestHelper <span class="kw">for </span>StringSinkTestHelper { |
| <span class="kw">fn </span>encode_to_string(<span class="kw-2">&</span><span class="self">self</span>, config: Config, bytes: <span class="kw-2">&</span>[u8]) -> String { |
| <span class="kw">let </span>encoder = ChunkedEncoder::new(config); |
| <span class="kw">let </span><span class="kw-2">mut </span>s = String::new(); |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>sink = StringSink::new(<span class="kw-2">&mut </span>s); |
| encoder.encode(bytes, <span class="kw-2">&mut </span>sink).unwrap(); |
| } |
| |
| s |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="base64" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
