| <!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/encoding_rs-0.8.32/src/x_user_defined.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>x_user_defined.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="../../encoding_rs/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="../../encoding_rs/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="comment">// Copyright Mozilla Foundation. See the COPYRIGHT |
| // file at the top-level directory of this distribution. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // https://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| </span><span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::handles::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::variant::<span class="kw-2">*</span>; |
| |
| <span class="macro">cfg_if! </span>{ |
| <span class="kw">if </span><span class="attribute">#[cfg(feature = <span class="string">"simd-accel"</span>)] </span>{ |
| <span class="kw">use </span>simd_funcs::<span class="kw-2">*</span>; |
| <span class="kw">use </span>packed_simd::u16x8; |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">fn </span>shift_upper(unpacked: u16x8) -> u16x8 { |
| <span class="kw">let </span>highest_ascii = u16x8::splat(<span class="number">0x7F</span>); |
| unpacked + unpacked.gt(highest_ascii).select(u16x8::splat(<span class="number">0xF700</span>), u16x8::splat(<span class="number">0</span>)) } |
| } <span class="kw">else </span>{ |
| } |
| } |
| |
| <span class="kw">pub struct </span>UserDefinedDecoder; |
| |
| <span class="kw">impl </span>UserDefinedDecoder { |
| <span class="kw">pub fn </span>new() -> VariantDecoder { |
| VariantDecoder::UserDefined(UserDefinedDecoder) |
| } |
| |
| <span class="kw">pub fn </span>max_utf16_buffer_length(<span class="kw-2">&</span><span class="self">self</span>, byte_length: usize) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="prelude-val">Some</span>(byte_length) |
| } |
| |
| <span class="kw">pub fn </span>max_utf8_buffer_length_without_replacement(<span class="kw-2">&</span><span class="self">self</span>, byte_length: usize) -> <span class="prelude-ty">Option</span><usize> { |
| byte_length.checked_mul(<span class="number">3</span>) |
| } |
| |
| <span class="kw">pub fn </span>max_utf8_buffer_length(<span class="kw-2">&</span><span class="self">self</span>, byte_length: usize) -> <span class="prelude-ty">Option</span><usize> { |
| byte_length.checked_mul(<span class="number">3</span>) |
| } |
| |
| <span class="macro">decoder_function!</span>( |
| {}, |
| {}, |
| {}, |
| { |
| <span class="kw">if </span>b < <span class="number">0x80 </span>{ |
| <span class="comment">// ASCII run not optimized, because binary data expected |
| </span>destination_handle.write_ascii(b); |
| <span class="kw">continue</span>; |
| } |
| destination_handle.write_upper_bmp(u16::from(b) + <span class="number">0xF700</span>); |
| <span class="kw">continue</span>; |
| }, |
| <span class="self">self</span>, |
| src_consumed, |
| dest, |
| source, |
| b, |
| destination_handle, |
| _unread_handle, |
| check_space_bmp, |
| decode_to_utf8_raw, |
| u8, |
| Utf8Destination |
| ); |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"simd-accel"</span>))] |
| </span><span class="kw">pub fn </span>decode_to_utf16_raw( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| src: <span class="kw-2">&</span>[u8], |
| dst: <span class="kw-2">&mut </span>[u16], |
| _last: bool, |
| ) -> (DecoderResult, usize, usize) { |
| <span class="kw">let </span>(pending, length) = <span class="kw">if </span>dst.len() < src.len() { |
| (DecoderResult::OutputFull, dst.len()) |
| } <span class="kw">else </span>{ |
| (DecoderResult::InputEmpty, src.len()) |
| }; |
| <span class="kw">let </span>src_trim = <span class="kw-2">&</span>src[..length]; |
| <span class="kw">let </span>dst_trim = <span class="kw-2">&mut </span>dst[..length]; |
| src_trim |
| .iter() |
| .zip(dst_trim.iter_mut()) |
| .for_each(|(from, to)| { |
| <span class="kw-2">*</span>to = { |
| <span class="kw">let </span>unit = <span class="kw-2">*</span>from; |
| <span class="kw">if </span>unit < <span class="number">0x80 </span>{ |
| u16::from(unit) |
| } <span class="kw">else </span>{ |
| u16::from(unit) + <span class="number">0xF700 |
| </span>} |
| } |
| }); |
| (pending, length, length) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"simd-accel"</span>)] |
| </span><span class="kw">pub fn </span>decode_to_utf16_raw( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| src: <span class="kw-2">&</span>[u8], |
| dst: <span class="kw-2">&mut </span>[u16], |
| _last: bool, |
| ) -> (DecoderResult, usize, usize) { |
| <span class="kw">let </span>(pending, length) = <span class="kw">if </span>dst.len() < src.len() { |
| (DecoderResult::OutputFull, dst.len()) |
| } <span class="kw">else </span>{ |
| (DecoderResult::InputEmpty, src.len()) |
| }; |
| <span class="comment">// Not bothering with alignment |
| </span><span class="kw">let </span>tail_start = length & !<span class="number">0xF</span>; |
| <span class="kw">let </span>simd_iterations = length >> <span class="number">4</span>; |
| <span class="kw">let </span>src_ptr = src.as_ptr(); |
| <span class="kw">let </span>dst_ptr = dst.as_mut_ptr(); |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..simd_iterations { |
| <span class="kw">let </span>input = <span class="kw">unsafe </span>{ load16_unaligned(src_ptr.add(i * <span class="number">16</span>)) }; |
| <span class="kw">let </span>(first, second) = simd_unpack(input); |
| <span class="kw">unsafe </span>{ |
| store8_unaligned(dst_ptr.add(i * <span class="number">16</span>), shift_upper(first)); |
| store8_unaligned(dst_ptr.add((i * <span class="number">16</span>) + <span class="number">8</span>), shift_upper(second)); |
| } |
| } |
| <span class="kw">let </span>src_tail = <span class="kw-2">&</span>src[tail_start..length]; |
| <span class="kw">let </span>dst_tail = <span class="kw-2">&mut </span>dst[tail_start..length]; |
| src_tail |
| .iter() |
| .zip(dst_tail.iter_mut()) |
| .for_each(|(from, to)| { |
| <span class="kw-2">*</span>to = { |
| <span class="kw">let </span>unit = <span class="kw-2">*</span>from; |
| <span class="kw">if </span>unit < <span class="number">0x80 </span>{ |
| u16::from(unit) |
| } <span class="kw">else </span>{ |
| u16::from(unit) + <span class="number">0xF700 |
| </span>} |
| } |
| }); |
| (pending, length, length) |
| } |
| } |
| |
| <span class="kw">pub struct </span>UserDefinedEncoder; |
| |
| <span class="kw">impl </span>UserDefinedEncoder { |
| <span class="kw">pub fn </span>new(encoding: <span class="kw-2">&</span><span class="lifetime">'static </span>Encoding) -> Encoder { |
| Encoder::new(encoding, VariantEncoder::UserDefined(UserDefinedEncoder)) |
| } |
| |
| <span class="kw">pub fn </span>max_buffer_length_from_utf16_without_replacement( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| u16_length: usize, |
| ) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="prelude-val">Some</span>(u16_length) |
| } |
| |
| <span class="kw">pub fn </span>max_buffer_length_from_utf8_without_replacement( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| byte_length: usize, |
| ) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="prelude-val">Some</span>(byte_length) |
| } |
| |
| <span class="macro">encoder_functions!</span>( |
| {}, |
| { |
| <span class="kw">if </span>c <= <span class="string">'\u{7F}' </span>{ |
| <span class="comment">// TODO optimize ASCII run |
| </span>destination_handle.write_one(c <span class="kw">as </span>u8); |
| <span class="kw">continue</span>; |
| } |
| <span class="kw">if </span>c < <span class="string">'\u{F780}' </span>|| c > <span class="string">'\u{F7FF}' </span>{ |
| <span class="kw">return </span>( |
| EncoderResult::Unmappable(c), |
| unread_handle.consumed(), |
| destination_handle.written(), |
| ); |
| } |
| destination_handle.write_one((u32::from(c) - <span class="number">0xF700</span>) <span class="kw">as </span>u8); |
| <span class="kw">continue</span>; |
| }, |
| <span class="self">self</span>, |
| src_consumed, |
| source, |
| dest, |
| c, |
| destination_handle, |
| unread_handle, |
| check_space_one |
| ); |
| } |
| |
| <span class="comment">// Any copyright to the test code below this comment is dedicated to the |
| // Public Domain. http://creativecommons.org/publicdomain/zero/1.0/ |
| |
| </span><span class="attribute">#[cfg(all(test, feature = <span class="string">"alloc"</span>))] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use </span><span class="kw">super</span>::<span class="kw">super</span>::testing::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">super</span>::<span class="kw">super</span>::<span class="kw-2">*</span>; |
| |
| <span class="kw">fn </span>decode_x_user_defined(bytes: <span class="kw-2">&</span>[u8], expect: <span class="kw-2">&</span>str) { |
| decode(X_USER_DEFINED, bytes, expect); |
| } |
| |
| <span class="kw">fn </span>encode_x_user_defined(string: <span class="kw-2">&</span>str, expect: <span class="kw-2">&</span>[u8]) { |
| encode(X_USER_DEFINED, string, expect); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_x_user_defined_decode() { |
| <span class="comment">// Empty |
| </span>decode_x_user_defined(<span class="string">b""</span>, <span class="string">""</span>); |
| |
| <span class="comment">// ASCII |
| </span>decode_x_user_defined(<span class="string">b"\x61\x62"</span>, <span class="string">"\u{0061}\u{0062}"</span>); |
| |
| decode_x_user_defined(<span class="string">b"\x80\xFF"</span>, <span class="string">"\u{F780}\u{F7FF}"</span>); |
| decode_x_user_defined(<span class="string">b"\x80\xFF\x61\x62\x80\xFF\x61\x62\x80\xFF\x61\x62\x80\xFF\x61\x62\x80\xFF\x61\x62"</span>, <span class="string">"\u{F780}\u{F7FF}\u{0061}\u{0062}\u{F780}\u{F7FF}\u{0061}\u{0062}\u{F780}\u{F7FF}\u{0061}\u{0062}\u{F780}\u{F7FF}\u{0061}\u{0062}\u{F780}\u{F7FF}\u{0061}\u{0062}"</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_x_user_defined_encode() { |
| <span class="comment">// Empty |
| </span>encode_x_user_defined(<span class="string">""</span>, <span class="string">b""</span>); |
| |
| <span class="comment">// ASCII |
| </span>encode_x_user_defined(<span class="string">"\u{0061}\u{0062}"</span>, <span class="string">b"\x61\x62"</span>); |
| |
| encode_x_user_defined(<span class="string">"\u{F780}\u{F7FF}"</span>, <span class="string">b"\x80\xFF"</span>); |
| encode_x_user_defined(<span class="string">"\u{F77F}\u{F800}"</span>, <span class="string">b"&#63359;&#63488;"</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_x_user_defined_from_two_low_surrogates() { |
| <span class="kw">let </span>expectation = <span class="string">b"&#65533;&#65533;"</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>output = [<span class="number">0u8</span>; <span class="number">40</span>]; |
| <span class="kw">let </span><span class="kw-2">mut </span>encoder = X_USER_DEFINED.new_encoder(); |
| <span class="kw">let </span>(result, read, written, had_errors) = |
| encoder.encode_from_utf16(<span class="kw-2">&</span>[<span class="number">0xDC00u16</span>, <span class="number">0xDEDEu16</span>], <span class="kw-2">&mut </span>output[..], <span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>(result, CoderResult::InputEmpty); |
| <span class="macro">assert_eq!</span>(read, <span class="number">2</span>); |
| <span class="macro">assert_eq!</span>(written, expectation.len()); |
| <span class="macro">assert!</span>(had_errors); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>output[..written], expectation); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="encoding_rs" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |