| <!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/encode.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>encode.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>::{Config, PAD_BYTE}; |
| <span class="attribute">#[cfg(any(feature = <span class="string">"alloc"</span>, feature = <span class="string">"std"</span>, test))] |
| </span><span class="kw">use crate</span>::{chunked_encoder, STANDARD}; |
| <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, vec}; |
| <span class="kw">use </span>core::convert::TryInto; |
| |
| <span class="doccomment">///Encode arbitrary octets as base64. |
| ///Returns a String. |
| ///Convenience for `encode_config(input, base64::STANDARD);`. |
| /// |
| ///# Example |
| /// |
| ///```rust |
| ///extern crate base64; |
| /// |
| ///fn main() { |
| /// let b64 = base64::encode(b"hello world"); |
| /// println!("{}", b64); |
| ///} |
| ///``` |
| </span><span class="attribute">#[cfg(any(feature = <span class="string">"alloc"</span>, feature = <span class="string">"std"</span>, test))] |
| </span><span class="kw">pub fn </span>encode<T: AsRef<[u8]>>(input: T) -> String { |
| encode_config(input, STANDARD) |
| } |
| |
| <span class="doccomment">///Encode arbitrary octets as base64. |
| ///Returns a String. |
| /// |
| ///# Example |
| /// |
| ///```rust |
| ///extern crate base64; |
| /// |
| ///fn main() { |
| /// let b64 = base64::encode_config(b"hello world~", base64::STANDARD); |
| /// println!("{}", b64); |
| /// |
| /// let b64_url = base64::encode_config(b"hello internet~", base64::URL_SAFE); |
| /// println!("{}", b64_url); |
| ///} |
| ///``` |
| </span><span class="attribute">#[cfg(any(feature = <span class="string">"alloc"</span>, feature = <span class="string">"std"</span>, test))] |
| </span><span class="kw">pub fn </span>encode_config<T: AsRef<[u8]>>(input: T, config: Config) -> String { |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = <span class="kw">match </span>encoded_size(input.as_ref().len(), config) { |
| <span class="prelude-val">Some</span>(n) => <span class="macro">vec!</span>[<span class="number">0</span>; n], |
| <span class="prelude-val">None </span>=> <span class="macro">panic!</span>(<span class="string">"integer overflow when calculating buffer size"</span>), |
| }; |
| |
| encode_with_padding(input.as_ref(), config, buf.len(), <span class="kw-2">&mut </span>buf[..]); |
| |
| String::from_utf8(buf).expect(<span class="string">"Invalid UTF8"</span>) |
| } |
| |
| <span class="doccomment">///Encode arbitrary octets as base64. |
| ///Writes into the supplied output buffer, which will grow the buffer if needed. |
| /// |
| ///# Example |
| /// |
| ///```rust |
| ///extern crate base64; |
| /// |
| ///fn main() { |
| /// let mut buf = String::new(); |
| /// base64::encode_config_buf(b"hello world~", base64::STANDARD, &mut buf); |
| /// println!("{}", buf); |
| /// |
| /// buf.clear(); |
| /// base64::encode_config_buf(b"hello internet~", base64::URL_SAFE, &mut buf); |
| /// println!("{}", buf); |
| ///} |
| ///``` |
| </span><span class="attribute">#[cfg(any(feature = <span class="string">"alloc"</span>, feature = <span class="string">"std"</span>, test))] |
| </span><span class="kw">pub fn </span>encode_config_buf<T: AsRef<[u8]>>(input: T, config: Config, buf: <span class="kw-2">&mut </span>String) { |
| <span class="kw">let </span>input_bytes = input.as_ref(); |
| |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>sink = chunked_encoder::StringSink::new(buf); |
| <span class="kw">let </span>encoder = chunked_encoder::ChunkedEncoder::new(config); |
| |
| encoder |
| .encode(input_bytes, <span class="kw-2">&mut </span>sink) |
| .expect(<span class="string">"Writing to a String shouldn't fail"</span>) |
| } |
| } |
| |
| <span class="doccomment">/// Encode arbitrary octets as base64. |
| /// Writes into the supplied output buffer. |
| /// |
| /// This is useful if you wish to avoid allocation entirely (e.g. encoding into a stack-resident |
| /// or statically-allocated buffer). |
| /// |
| /// # Panics |
| /// |
| /// If `output` is too small to hold the encoded version of `input`, a panic will result. |
| /// |
| /// # Example |
| /// |
| /// ```rust |
| /// extern crate base64; |
| /// |
| /// fn main() { |
| /// let s = b"hello internet!"; |
| /// let mut buf = Vec::new(); |
| /// // make sure we'll have a slice big enough for base64 + padding |
| /// buf.resize(s.len() * 4 / 3 + 4, 0); |
| /// |
| /// let bytes_written = base64::encode_config_slice(s, |
| /// base64::STANDARD, &mut buf); |
| /// |
| /// // shorten our vec down to just what was written |
| /// buf.resize(bytes_written, 0); |
| /// |
| /// assert_eq!(s, base64::decode(&buf).unwrap().as_slice()); |
| /// } |
| /// ``` |
| </span><span class="kw">pub fn </span>encode_config_slice<T: AsRef<[u8]>>(input: T, config: Config, output: <span class="kw-2">&mut </span>[u8]) -> usize { |
| <span class="kw">let </span>input_bytes = input.as_ref(); |
| |
| <span class="kw">let </span>encoded_size = encoded_size(input_bytes.len(), config) |
| .expect(<span class="string">"usize overflow when calculating buffer size"</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>b64_output = <span class="kw-2">&mut </span>output[<span class="number">0</span>..encoded_size]; |
| |
| encode_with_padding(<span class="kw-2">&</span>input_bytes, config, encoded_size, <span class="kw-2">&mut </span>b64_output); |
| |
| encoded_size |
| } |
| |
| <span class="doccomment">/// B64-encode and pad (if configured). |
| /// |
| /// This helper exists to avoid recalculating encoded_size, which is relatively expensive on short |
| /// inputs. |
| /// |
| /// `encoded_size` is the encoded size calculated for `input`. |
| /// |
| /// `output` must be of size `encoded_size`. |
| /// |
| /// All bytes in `output` will be written to since it is exactly the size of the output. |
| </span><span class="kw">fn </span>encode_with_padding(input: <span class="kw-2">&</span>[u8], config: Config, encoded_size: usize, output: <span class="kw-2">&mut </span>[u8]) { |
| <span class="macro">debug_assert_eq!</span>(encoded_size, output.len()); |
| |
| <span class="kw">let </span>b64_bytes_written = encode_to_slice(input, output, config.char_set.encode_table()); |
| |
| <span class="kw">let </span>padding_bytes = <span class="kw">if </span>config.pad { |
| add_padding(input.len(), <span class="kw-2">&mut </span>output[b64_bytes_written..]) |
| } <span class="kw">else </span>{ |
| <span class="number">0 |
| </span>}; |
| |
| <span class="kw">let </span>encoded_bytes = b64_bytes_written |
| .checked_add(padding_bytes) |
| .expect(<span class="string">"usize overflow when calculating b64 length"</span>); |
| |
| <span class="macro">debug_assert_eq!</span>(encoded_size, encoded_bytes); |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>read_u64(s: <span class="kw-2">&</span>[u8]) -> u64 { |
| u64::from_be_bytes(s[..<span class="number">8</span>].try_into().unwrap()) |
| } |
| |
| <span class="doccomment">/// Encode input bytes to utf8 base64 bytes. Does not pad. |
| /// `output` must be long enough to hold the encoded `input` without padding. |
| /// Returns the number of bytes written. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>encode_to_slice(input: <span class="kw-2">&</span>[u8], output: <span class="kw-2">&mut </span>[u8], encode_table: <span class="kw-2">&</span>[u8; <span class="number">64</span>]) -> usize { |
| <span class="kw">let </span><span class="kw-2">mut </span>input_index: usize = <span class="number">0</span>; |
| |
| <span class="kw">const </span>BLOCKS_PER_FAST_LOOP: usize = <span class="number">4</span>; |
| <span class="kw">const </span>LOW_SIX_BITS: u64 = <span class="number">0x3F</span>; |
| |
| <span class="comment">// we read 8 bytes at a time (u64) but only actually consume 6 of those bytes. Thus, we need |
| // 2 trailing bytes to be available to read.. |
| </span><span class="kw">let </span>last_fast_index = input.len().saturating_sub(BLOCKS_PER_FAST_LOOP * <span class="number">6 </span>+ <span class="number">2</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>output_index = <span class="number">0</span>; |
| |
| <span class="kw">if </span>last_fast_index > <span class="number">0 </span>{ |
| <span class="kw">while </span>input_index <= last_fast_index { |
| <span class="comment">// Major performance wins from letting the optimizer do the bounds check once, mostly |
| // on the output side |
| </span><span class="kw">let </span>input_chunk = <span class="kw-2">&</span>input[input_index..(input_index + (BLOCKS_PER_FAST_LOOP * <span class="number">6 </span>+ <span class="number">2</span>))]; |
| <span class="kw">let </span>output_chunk = <span class="kw-2">&mut </span>output[output_index..(output_index + BLOCKS_PER_FAST_LOOP * <span class="number">8</span>)]; |
| |
| <span class="comment">// Hand-unrolling for 32 vs 16 or 8 bytes produces yields performance about equivalent |
| // to unsafe pointer code on a Xeon E5-1650v3. 64 byte unrolling was slightly better for |
| // large inputs but significantly worse for 50-byte input, unsurprisingly. I suspect |
| // that it's a not uncommon use case to encode smallish chunks of data (e.g. a 64-byte |
| // SHA-512 digest), so it would be nice if that fit in the unrolled loop at least once. |
| // Plus, single-digit percentage performance differences might well be quite different |
| // on different hardware. |
| |
| </span><span class="kw">let </span>input_u64 = read_u64(<span class="kw-2">&</span>input_chunk[<span class="number">0</span>..]); |
| |
| output_chunk[<span class="number">0</span>] = encode_table[((input_u64 >> <span class="number">58</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">1</span>] = encode_table[((input_u64 >> <span class="number">52</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">2</span>] = encode_table[((input_u64 >> <span class="number">46</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">3</span>] = encode_table[((input_u64 >> <span class="number">40</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">4</span>] = encode_table[((input_u64 >> <span class="number">34</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">5</span>] = encode_table[((input_u64 >> <span class="number">28</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">6</span>] = encode_table[((input_u64 >> <span class="number">22</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">7</span>] = encode_table[((input_u64 >> <span class="number">16</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| |
| <span class="kw">let </span>input_u64 = read_u64(<span class="kw-2">&</span>input_chunk[<span class="number">6</span>..]); |
| |
| output_chunk[<span class="number">8</span>] = encode_table[((input_u64 >> <span class="number">58</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">9</span>] = encode_table[((input_u64 >> <span class="number">52</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">10</span>] = encode_table[((input_u64 >> <span class="number">46</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">11</span>] = encode_table[((input_u64 >> <span class="number">40</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">12</span>] = encode_table[((input_u64 >> <span class="number">34</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">13</span>] = encode_table[((input_u64 >> <span class="number">28</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">14</span>] = encode_table[((input_u64 >> <span class="number">22</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">15</span>] = encode_table[((input_u64 >> <span class="number">16</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| |
| <span class="kw">let </span>input_u64 = read_u64(<span class="kw-2">&</span>input_chunk[<span class="number">12</span>..]); |
| |
| output_chunk[<span class="number">16</span>] = encode_table[((input_u64 >> <span class="number">58</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">17</span>] = encode_table[((input_u64 >> <span class="number">52</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">18</span>] = encode_table[((input_u64 >> <span class="number">46</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">19</span>] = encode_table[((input_u64 >> <span class="number">40</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">20</span>] = encode_table[((input_u64 >> <span class="number">34</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">21</span>] = encode_table[((input_u64 >> <span class="number">28</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">22</span>] = encode_table[((input_u64 >> <span class="number">22</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">23</span>] = encode_table[((input_u64 >> <span class="number">16</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| |
| <span class="kw">let </span>input_u64 = read_u64(<span class="kw-2">&</span>input_chunk[<span class="number">18</span>..]); |
| |
| output_chunk[<span class="number">24</span>] = encode_table[((input_u64 >> <span class="number">58</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">25</span>] = encode_table[((input_u64 >> <span class="number">52</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">26</span>] = encode_table[((input_u64 >> <span class="number">46</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">27</span>] = encode_table[((input_u64 >> <span class="number">40</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">28</span>] = encode_table[((input_u64 >> <span class="number">34</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">29</span>] = encode_table[((input_u64 >> <span class="number">28</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">30</span>] = encode_table[((input_u64 >> <span class="number">22</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">31</span>] = encode_table[((input_u64 >> <span class="number">16</span>) & LOW_SIX_BITS) <span class="kw">as </span>usize]; |
| |
| output_index += BLOCKS_PER_FAST_LOOP * <span class="number">8</span>; |
| input_index += BLOCKS_PER_FAST_LOOP * <span class="number">6</span>; |
| } |
| } |
| |
| <span class="comment">// Encode what's left after the fast loop. |
| |
| </span><span class="kw">const </span>LOW_SIX_BITS_U8: u8 = <span class="number">0x3F</span>; |
| |
| <span class="kw">let </span>rem = input.len() % <span class="number">3</span>; |
| <span class="kw">let </span>start_of_rem = input.len() - rem; |
| |
| <span class="comment">// start at the first index not handled by fast loop, which may be 0. |
| |
| </span><span class="kw">while </span>input_index < start_of_rem { |
| <span class="kw">let </span>input_chunk = <span class="kw-2">&</span>input[input_index..(input_index + <span class="number">3</span>)]; |
| <span class="kw">let </span>output_chunk = <span class="kw-2">&mut </span>output[output_index..(output_index + <span class="number">4</span>)]; |
| |
| output_chunk[<span class="number">0</span>] = encode_table[(input_chunk[<span class="number">0</span>] >> <span class="number">2</span>) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">1</span>] = |
| encode_table[((input_chunk[<span class="number">0</span>] << <span class="number">4 </span>| input_chunk[<span class="number">1</span>] >> <span class="number">4</span>) & LOW_SIX_BITS_U8) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">2</span>] = |
| encode_table[((input_chunk[<span class="number">1</span>] << <span class="number">2 </span>| input_chunk[<span class="number">2</span>] >> <span class="number">6</span>) & LOW_SIX_BITS_U8) <span class="kw">as </span>usize]; |
| output_chunk[<span class="number">3</span>] = encode_table[(input_chunk[<span class="number">2</span>] & LOW_SIX_BITS_U8) <span class="kw">as </span>usize]; |
| |
| input_index += <span class="number">3</span>; |
| output_index += <span class="number">4</span>; |
| } |
| |
| <span class="kw">if </span>rem == <span class="number">2 </span>{ |
| output[output_index] = encode_table[(input[start_of_rem] >> <span class="number">2</span>) <span class="kw">as </span>usize]; |
| output[output_index + <span class="number">1</span>] = encode_table[((input[start_of_rem] << <span class="number">4 |
| </span>| input[start_of_rem + <span class="number">1</span>] >> <span class="number">4</span>) |
| & LOW_SIX_BITS_U8) <span class="kw">as </span>usize]; |
| output[output_index + <span class="number">2</span>] = |
| encode_table[((input[start_of_rem + <span class="number">1</span>] << <span class="number">2</span>) & LOW_SIX_BITS_U8) <span class="kw">as </span>usize]; |
| output_index += <span class="number">3</span>; |
| } <span class="kw">else if </span>rem == <span class="number">1 </span>{ |
| output[output_index] = encode_table[(input[start_of_rem] >> <span class="number">2</span>) <span class="kw">as </span>usize]; |
| output[output_index + <span class="number">1</span>] = |
| encode_table[((input[start_of_rem] << <span class="number">4</span>) & LOW_SIX_BITS_U8) <span class="kw">as </span>usize]; |
| output_index += <span class="number">2</span>; |
| } |
| |
| output_index |
| } |
| |
| <span class="doccomment">/// calculate the base64 encoded string size, including padding if appropriate |
| </span><span class="kw">pub fn </span>encoded_size(bytes_len: usize, config: Config) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="kw">let </span>rem = bytes_len % <span class="number">3</span>; |
| |
| <span class="kw">let </span>complete_input_chunks = bytes_len / <span class="number">3</span>; |
| <span class="kw">let </span>complete_chunk_output = complete_input_chunks.checked_mul(<span class="number">4</span>); |
| |
| <span class="kw">if </span>rem > <span class="number">0 </span>{ |
| <span class="kw">if </span>config.pad { |
| complete_chunk_output.and_then(|c| c.checked_add(<span class="number">4</span>)) |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>encoded_rem = <span class="kw">match </span>rem { |
| <span class="number">1 </span>=> <span class="number">2</span>, |
| <span class="number">2 </span>=> <span class="number">3</span>, |
| <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(<span class="string">"Impossible remainder"</span>), |
| }; |
| complete_chunk_output.and_then(|c| c.checked_add(encoded_rem)) |
| } |
| } <span class="kw">else </span>{ |
| complete_chunk_output |
| } |
| } |
| |
| <span class="doccomment">/// Write padding characters. |
| /// `output` is the slice where padding should be written, of length at least 2. |
| /// |
| /// Returns the number of padding bytes written. |
| </span><span class="kw">pub fn </span>add_padding(input_len: usize, output: <span class="kw-2">&mut </span>[u8]) -> usize { |
| <span class="kw">let </span>rem = input_len % <span class="number">3</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>bytes_written = <span class="number">0</span>; |
| <span class="kw">for _ in </span><span class="number">0</span>..((<span class="number">3 </span>- rem) % <span class="number">3</span>) { |
| output[bytes_written] = PAD_BYTE; |
| bytes_written += <span class="number">1</span>; |
| } |
| |
| bytes_written |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use crate</span>::{ |
| decode::decode_config_buf, |
| tests::{assert_encode_sanity, random_config}, |
| Config, STANDARD, URL_SAFE_NO_PAD, |
| }; |
| |
| <span class="kw">use </span>rand::{ |
| distributions::{Distribution, Uniform}, |
| FromEntropy, Rng, |
| }; |
| <span class="kw">use </span>std; |
| <span class="kw">use </span>std::str; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>encoded_size_correct_standard() { |
| assert_encoded_length(<span class="number">0</span>, <span class="number">0</span>, STANDARD); |
| |
| assert_encoded_length(<span class="number">1</span>, <span class="number">4</span>, STANDARD); |
| assert_encoded_length(<span class="number">2</span>, <span class="number">4</span>, STANDARD); |
| assert_encoded_length(<span class="number">3</span>, <span class="number">4</span>, STANDARD); |
| |
| assert_encoded_length(<span class="number">4</span>, <span class="number">8</span>, STANDARD); |
| assert_encoded_length(<span class="number">5</span>, <span class="number">8</span>, STANDARD); |
| assert_encoded_length(<span class="number">6</span>, <span class="number">8</span>, STANDARD); |
| |
| assert_encoded_length(<span class="number">7</span>, <span class="number">12</span>, STANDARD); |
| assert_encoded_length(<span class="number">8</span>, <span class="number">12</span>, STANDARD); |
| assert_encoded_length(<span class="number">9</span>, <span class="number">12</span>, STANDARD); |
| |
| assert_encoded_length(<span class="number">54</span>, <span class="number">72</span>, STANDARD); |
| |
| assert_encoded_length(<span class="number">55</span>, <span class="number">76</span>, STANDARD); |
| assert_encoded_length(<span class="number">56</span>, <span class="number">76</span>, STANDARD); |
| assert_encoded_length(<span class="number">57</span>, <span class="number">76</span>, STANDARD); |
| |
| assert_encoded_length(<span class="number">58</span>, <span class="number">80</span>, STANDARD); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>encoded_size_correct_no_pad() { |
| assert_encoded_length(<span class="number">0</span>, <span class="number">0</span>, URL_SAFE_NO_PAD); |
| |
| assert_encoded_length(<span class="number">1</span>, <span class="number">2</span>, URL_SAFE_NO_PAD); |
| assert_encoded_length(<span class="number">2</span>, <span class="number">3</span>, URL_SAFE_NO_PAD); |
| assert_encoded_length(<span class="number">3</span>, <span class="number">4</span>, URL_SAFE_NO_PAD); |
| |
| assert_encoded_length(<span class="number">4</span>, <span class="number">6</span>, URL_SAFE_NO_PAD); |
| assert_encoded_length(<span class="number">5</span>, <span class="number">7</span>, URL_SAFE_NO_PAD); |
| assert_encoded_length(<span class="number">6</span>, <span class="number">8</span>, URL_SAFE_NO_PAD); |
| |
| assert_encoded_length(<span class="number">7</span>, <span class="number">10</span>, URL_SAFE_NO_PAD); |
| assert_encoded_length(<span class="number">8</span>, <span class="number">11</span>, URL_SAFE_NO_PAD); |
| assert_encoded_length(<span class="number">9</span>, <span class="number">12</span>, URL_SAFE_NO_PAD); |
| |
| assert_encoded_length(<span class="number">54</span>, <span class="number">72</span>, URL_SAFE_NO_PAD); |
| |
| assert_encoded_length(<span class="number">55</span>, <span class="number">74</span>, URL_SAFE_NO_PAD); |
| assert_encoded_length(<span class="number">56</span>, <span class="number">75</span>, URL_SAFE_NO_PAD); |
| assert_encoded_length(<span class="number">57</span>, <span class="number">76</span>, URL_SAFE_NO_PAD); |
| |
| assert_encoded_length(<span class="number">58</span>, <span class="number">78</span>, URL_SAFE_NO_PAD); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>encoded_size_overflow() { |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, encoded_size(std::usize::MAX, STANDARD)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>encode_config_buf_into_nonempty_buffer_doesnt_clobber_prefix() { |
| <span class="kw">let </span><span class="kw-2">mut </span>orig_data = Vec::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>prefix = String::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>encoded_data_no_prefix = String::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>encoded_data_with_prefix = String::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>decoded = Vec::new(); |
| |
| <span class="kw">let </span>prefix_len_range = Uniform::new(<span class="number">0</span>, <span class="number">1000</span>); |
| <span class="kw">let </span>input_len_range = Uniform::new(<span class="number">0</span>, <span class="number">1000</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>rng = rand::rngs::SmallRng::from_entropy(); |
| |
| <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">10_000 </span>{ |
| orig_data.clear(); |
| prefix.clear(); |
| encoded_data_no_prefix.clear(); |
| encoded_data_with_prefix.clear(); |
| decoded.clear(); |
| |
| <span class="kw">let </span>input_len = input_len_range.sample(<span class="kw-2">&mut </span>rng); |
| |
| <span class="kw">for _ in </span><span class="number">0</span>..input_len { |
| orig_data.push(rng.gen()); |
| } |
| |
| <span class="kw">let </span>prefix_len = prefix_len_range.sample(<span class="kw-2">&mut </span>rng); |
| <span class="kw">for _ in </span><span class="number">0</span>..prefix_len { |
| <span class="comment">// getting convenient random single-byte printable chars that aren't base64 is |
| // annoying |
| </span>prefix.push(<span class="string">'#'</span>); |
| } |
| encoded_data_with_prefix.push_str(<span class="kw-2">&</span>prefix); |
| |
| <span class="kw">let </span>config = random_config(<span class="kw-2">&mut </span>rng); |
| encode_config_buf(<span class="kw-2">&</span>orig_data, config, <span class="kw-2">&mut </span>encoded_data_no_prefix); |
| encode_config_buf(<span class="kw-2">&</span>orig_data, config, <span class="kw-2">&mut </span>encoded_data_with_prefix); |
| |
| <span class="macro">assert_eq!</span>( |
| encoded_data_no_prefix.len() + prefix_len, |
| encoded_data_with_prefix.len() |
| ); |
| assert_encode_sanity(<span class="kw-2">&</span>encoded_data_no_prefix, config, input_len); |
| assert_encode_sanity(<span class="kw-2">&</span>encoded_data_with_prefix[prefix_len..], config, input_len); |
| |
| <span class="comment">// append plain encode onto prefix |
| </span>prefix.push_str(<span class="kw-2">&mut </span>encoded_data_no_prefix); |
| |
| <span class="macro">assert_eq!</span>(prefix, encoded_data_with_prefix); |
| |
| decode_config_buf(<span class="kw-2">&</span>encoded_data_no_prefix, config, <span class="kw-2">&mut </span>decoded).unwrap(); |
| <span class="macro">assert_eq!</span>(orig_data, decoded); |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>encode_config_slice_into_nonempty_buffer_doesnt_clobber_suffix() { |
| <span class="kw">let </span><span class="kw-2">mut </span>orig_data = Vec::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>encoded_data = Vec::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>encoded_data_original_state = Vec::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>decoded = Vec::new(); |
| |
| <span class="kw">let </span>input_len_range = Uniform::new(<span class="number">0</span>, <span class="number">1000</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>rng = rand::rngs::SmallRng::from_entropy(); |
| |
| <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">10_000 </span>{ |
| orig_data.clear(); |
| encoded_data.clear(); |
| encoded_data_original_state.clear(); |
| decoded.clear(); |
| |
| <span class="kw">let </span>input_len = input_len_range.sample(<span class="kw-2">&mut </span>rng); |
| |
| <span class="kw">for _ in </span><span class="number">0</span>..input_len { |
| orig_data.push(rng.gen()); |
| } |
| |
| <span class="comment">// plenty of existing garbage in the encoded buffer |
| </span><span class="kw">for _ in </span><span class="number">0</span>..<span class="number">10 </span>* input_len { |
| encoded_data.push(rng.gen()); |
| } |
| |
| encoded_data_original_state.extend_from_slice(<span class="kw-2">&</span>encoded_data); |
| |
| <span class="kw">let </span>config = random_config(<span class="kw-2">&mut </span>rng); |
| |
| <span class="kw">let </span>encoded_size = encoded_size(input_len, config).unwrap(); |
| |
| <span class="macro">assert_eq!</span>( |
| encoded_size, |
| encode_config_slice(<span class="kw-2">&</span>orig_data, config, <span class="kw-2">&mut </span>encoded_data) |
| ); |
| |
| assert_encode_sanity( |
| std::str::from_utf8(<span class="kw-2">&</span>encoded_data[<span class="number">0</span>..encoded_size]).unwrap(), |
| config, |
| input_len, |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| <span class="kw-2">&</span>encoded_data[encoded_size..], |
| <span class="kw-2">&</span>encoded_data_original_state[encoded_size..] |
| ); |
| |
| decode_config_buf(<span class="kw-2">&</span>encoded_data[<span class="number">0</span>..encoded_size], config, <span class="kw-2">&mut </span>decoded).unwrap(); |
| <span class="macro">assert_eq!</span>(orig_data, decoded); |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>encode_config_slice_fits_into_precisely_sized_slice() { |
| <span class="kw">let </span><span class="kw-2">mut </span>orig_data = Vec::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>encoded_data = Vec::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>decoded = Vec::new(); |
| |
| <span class="kw">let </span>input_len_range = Uniform::new(<span class="number">0</span>, <span class="number">1000</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>rng = rand::rngs::SmallRng::from_entropy(); |
| |
| <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">10_000 </span>{ |
| orig_data.clear(); |
| encoded_data.clear(); |
| decoded.clear(); |
| |
| <span class="kw">let </span>input_len = input_len_range.sample(<span class="kw-2">&mut </span>rng); |
| |
| <span class="kw">for _ in </span><span class="number">0</span>..input_len { |
| orig_data.push(rng.gen()); |
| } |
| |
| <span class="kw">let </span>config = random_config(<span class="kw-2">&mut </span>rng); |
| |
| <span class="kw">let </span>encoded_size = encoded_size(input_len, config).unwrap(); |
| |
| encoded_data.resize(encoded_size, <span class="number">0</span>); |
| |
| <span class="macro">assert_eq!</span>( |
| encoded_size, |
| encode_config_slice(<span class="kw-2">&</span>orig_data, config, <span class="kw-2">&mut </span>encoded_data) |
| ); |
| |
| assert_encode_sanity( |
| std::str::from_utf8(<span class="kw-2">&</span>encoded_data[<span class="number">0</span>..encoded_size]).unwrap(), |
| config, |
| input_len, |
| ); |
| |
| decode_config_buf(<span class="kw-2">&</span>encoded_data[<span class="number">0</span>..encoded_size], config, <span class="kw-2">&mut </span>decoded).unwrap(); |
| <span class="macro">assert_eq!</span>(orig_data, decoded); |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>encode_to_slice_random_valid_utf8() { |
| <span class="kw">let </span><span class="kw-2">mut </span>input = Vec::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>output = Vec::new(); |
| |
| <span class="kw">let </span>input_len_range = Uniform::new(<span class="number">0</span>, <span class="number">1000</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>rng = rand::rngs::SmallRng::from_entropy(); |
| |
| <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">10_000 </span>{ |
| input.clear(); |
| output.clear(); |
| |
| <span class="kw">let </span>input_len = input_len_range.sample(<span class="kw-2">&mut </span>rng); |
| |
| <span class="kw">for _ in </span><span class="number">0</span>..input_len { |
| input.push(rng.gen()); |
| } |
| |
| <span class="kw">let </span>config = random_config(<span class="kw-2">&mut </span>rng); |
| |
| <span class="comment">// fill up the output buffer with garbage |
| </span><span class="kw">let </span>encoded_size = encoded_size(input_len, config).unwrap(); |
| <span class="kw">for _ in </span><span class="number">0</span>..encoded_size { |
| output.push(rng.gen()); |
| } |
| |
| <span class="kw">let </span>orig_output_buf = output.to_vec(); |
| |
| <span class="kw">let </span>bytes_written = |
| encode_to_slice(<span class="kw-2">&</span>input, <span class="kw-2">&mut </span>output, config.char_set.encode_table()); |
| |
| <span class="comment">// make sure the part beyond bytes_written is the same garbage it was before |
| </span><span class="macro">assert_eq!</span>(orig_output_buf[bytes_written..], output[bytes_written..]); |
| |
| <span class="comment">// make sure the encoded bytes are UTF-8 |
| </span><span class="kw">let _ </span>= str::from_utf8(<span class="kw-2">&</span>output[<span class="number">0</span>..bytes_written]).unwrap(); |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>encode_with_padding_random_valid_utf8() { |
| <span class="kw">let </span><span class="kw-2">mut </span>input = Vec::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>output = Vec::new(); |
| |
| <span class="kw">let </span>input_len_range = Uniform::new(<span class="number">0</span>, <span class="number">1000</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>rng = rand::rngs::SmallRng::from_entropy(); |
| |
| <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">10_000 </span>{ |
| input.clear(); |
| output.clear(); |
| |
| <span class="kw">let </span>input_len = input_len_range.sample(<span class="kw-2">&mut </span>rng); |
| |
| <span class="kw">for _ in </span><span class="number">0</span>..input_len { |
| input.push(rng.gen()); |
| } |
| |
| <span class="kw">let </span>config = random_config(<span class="kw-2">&mut </span>rng); |
| |
| <span class="comment">// fill up the output buffer with garbage |
| </span><span class="kw">let </span>encoded_size = encoded_size(input_len, config).unwrap(); |
| <span class="kw">for _ in </span><span class="number">0</span>..encoded_size + <span class="number">1000 </span>{ |
| output.push(rng.gen()); |
| } |
| |
| <span class="kw">let </span>orig_output_buf = output.to_vec(); |
| |
| encode_with_padding(<span class="kw-2">&</span>input, config, encoded_size, <span class="kw-2">&mut </span>output[<span class="number">0</span>..encoded_size]); |
| |
| <span class="comment">// make sure the part beyond b64 is the same garbage it was before |
| </span><span class="macro">assert_eq!</span>(orig_output_buf[encoded_size..], output[encoded_size..]); |
| |
| <span class="comment">// make sure the encoded bytes are UTF-8 |
| </span><span class="kw">let _ </span>= str::from_utf8(<span class="kw-2">&</span>output[<span class="number">0</span>..encoded_size]).unwrap(); |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>add_padding_random_valid_utf8() { |
| <span class="kw">let </span><span class="kw-2">mut </span>output = Vec::new(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>rng = rand::rngs::SmallRng::from_entropy(); |
| |
| <span class="comment">// cover our bases for length % 3 |
| </span><span class="kw">for </span>input_len <span class="kw">in </span><span class="number">0</span>..<span class="number">10 </span>{ |
| output.clear(); |
| |
| <span class="comment">// fill output with random |
| </span><span class="kw">for _ in </span><span class="number">0</span>..<span class="number">10 </span>{ |
| output.push(rng.gen()); |
| } |
| |
| <span class="kw">let </span>orig_output_buf = output.to_vec(); |
| |
| <span class="kw">let </span>bytes_written = add_padding(input_len, <span class="kw-2">&mut </span>output); |
| |
| <span class="comment">// make sure the part beyond bytes_written is the same garbage it was before |
| </span><span class="macro">assert_eq!</span>(orig_output_buf[bytes_written..], output[bytes_written..]); |
| |
| <span class="comment">// make sure the encoded bytes are UTF-8 |
| </span><span class="kw">let _ </span>= str::from_utf8(<span class="kw-2">&</span>output[<span class="number">0</span>..bytes_written]).unwrap(); |
| } |
| } |
| |
| <span class="kw">fn </span>assert_encoded_length(input_len: usize, encoded_len: usize, config: Config) { |
| <span class="macro">assert_eq!</span>(encoded_len, encoded_size(input_len, config).unwrap()); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>bytes: Vec<u8> = Vec::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>rng = rand::rngs::SmallRng::from_entropy(); |
| |
| <span class="kw">for _ in </span><span class="number">0</span>..input_len { |
| bytes.push(rng.gen()); |
| } |
| |
| <span class="kw">let </span>encoded = encode_config(<span class="kw-2">&</span>bytes, config); |
| assert_encode_sanity(<span class="kw-2">&</span>encoded, config, input_len); |
| |
| <span class="macro">assert_eq!</span>(encoded_len, encoded.len()); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>encode_imap() { |
| <span class="macro">assert_eq!</span>( |
| encode_config(<span class="string">b"\xFB\xFF"</span>, <span class="kw">crate</span>::IMAP_MUTF7), |
| encode_config(<span class="string">b"\xFB\xFF"</span>, <span class="kw">crate</span>::STANDARD_NO_PAD).replace(<span class="string">"/"</span>, <span class="string">","</span>) |
| ); |
| } |
| } |
| </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> |
