148 lines
5.7 KiB
Rust
148 lines
5.7 KiB
Rust
mod avx2;
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mod fallback;
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mod naive;
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mod sse2;
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use std::ptr;
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use super::buffer::Buffer;
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static ESCAPE_LUT: [u8; 256] = [
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9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
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9, 9, 9, 9, 9, 9, 0, 9, 9, 9, 1, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
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9, 9, 9, 9, 2, 9, 3, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
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9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
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9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
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9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
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9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
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9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
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9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
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9, 9, 9, 9,
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];
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const ESCAPED: [&'static str; 4] = [""", "&", "<", ">"];
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const ESCAPED_LEN: usize = 4;
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#[inline]
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pub fn escape_with<F: FnMut(&str)>(mut writer: F, feed: &str) {
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unsafe {
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#[cfg(target_feature = "avx2")]
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{
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avx2::escape(&mut writer, feed.as_bytes());
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}
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#[cfg(not(target_feature = "avx2"))]
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{
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if is_x86_feature_detected!("avx2") {
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avx2::escape(&mut writer, feed.as_bytes());
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} else if is_x86_feature_detected!("sse2") {
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sse2::escape(&mut writer, feed.as_bytes());
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} else {
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fallback::escape(&mut writer, feed.as_bytes());
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}
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}
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}
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}
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#[doc(hidden)]
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pub fn escape_to_buf(feed: &str, buf: &mut Buffer) {
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escape_with(|e| buf.write_str(e), feed);
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}
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#[inline]
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pub fn escape_to_string(feed: &str, s: &mut String) {
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unsafe {
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let mut buf = Buffer::from(ptr::read(s));
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escape_to_buf(feed, &mut buf);
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ptr::write(s, buf.into_string());
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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fn escape(feed: &str) -> String {
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let mut buf = Buffer::new();
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escape_to_buf(feed, &mut buf);
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buf.into_string()
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}
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#[test]
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fn noescape() {
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assert_eq!(escape(""), "");
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assert_eq!(
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escape("abcdefghijklmnopqrstrvwxyz"),
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"abcdefghijklmnopqrstrvwxyz"
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);
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assert_eq!(escape("!#$%()*+,-.:;=?_^"), "!#$%()*+,-.:;=?_^");
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assert_eq!(
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escape("漢字はエスケープしないはずだよ"),
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"漢字はエスケープしないはずだよ"
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);
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}
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#[test]
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fn escape_short() {
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assert_eq!(escape("<"), "<");
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assert_eq!(escape("\"&<>"), ""&<>");
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assert_eq!(
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escape("{\"title\": \"This is a JSON!\"}"),
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"{"title": "This is a JSON!"}"
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);
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assert_eq!(
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escape("<html><body><h1>Hello, world</h1></body></html>"),
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"<html><body><h1>Hello, world</h1>\
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</body></html>"
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);
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}
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#[test]
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#[rustfmt::skip]
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fn escape_long() {
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assert_eq!(
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escape(r###"m{jml&,?6>\2~08g)\=3`,_`$1@0{i5j}.}2ki\^t}k"@p4$~?;!;pn_l8v."ki`%/&^=\[y+qcerr`@3*|?du.\0vd#40.>bcpf\u@m|c<2t7`hk)^?"0u{v%9}4y2hhv?%-f`<;rzwx`7}l(j2b:c\<|z&$x{+k;f`0+w3e0\m.wmdli>94e2hp\$}j0&m(*h$/lwlj#}99r;o.kj@1#}~v+;y~b[~m.eci}&l7fxt`\\{~#k*9z/d{}(.^j}[(,]:<\h]9k2+0*w60/|23~5;/!-h&ci*~e1h~+:1lhh\>y_*>:-\zzv+8uo],,a^k3_,uip]-/.-~\t51a*<{6!<(_|<#o6=\h1*`[2x_?#-/])x};};r@wqx|;/w&jrv~?\`t:^/dug3(g(ener?!t$}h4:57ptnm@71e=t>@o*"$]799r=+)t>co?rvgk%u0c@.9os;#t_*/gqv<za&~r^]"{t4by2t`<q4bfo^&!so5/~(nxk:7l\;#0w41u~w3i$g|>e/t;o<*`~?3.jyx+h)+^cn^j4td|>)~rs)vm#]:"&\fi;54%+z~fhe|w~\q|ui={54[b9tg*?@]g+q!mq]3jg2?eoo"chyat3k#7pq1u=.l]c14twa4tg#5k_""###),
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r###"m{jml&,?6>\2~08g)\=3`,_`$1@0{i5j}.}2ki\^t}k"@p4$~?;!;pn_l8v."ki`%/&^=\[y+qcerr`@3*|?du.\0vd#40.>bcpf\u@m|c<2t7`hk)^?"0u{v%9}4y2hhv?%-f`<;rzwx`7}l(j2b:c\<|z&$x{+k;f`0+w3e0\m.wmdli>94e2hp\$}j0&m(*h$/lwlj#}99r;o.kj@1#}~v+;y~b[~m.eci}&l7fxt`\\{~#k*9z/d{}(.^j}[(,]:<\h]9k2+0*w60/|23~5;/!-h&ci*~e1h~+:1lhh\>y_*>:-\zzv+8uo],,a^k3_,uip]-/.-~\t51a*<{6!<(_|<#o6=\h1*`[2x_?#-/])x};};r@wqx|;/w&jrv~?\`t:^/dug3(g(ener?!t$}h4:57ptnm@71e=t>@o*"$]799r=+)t>co?rvgk%u0c@.9os;#t_*/gqv<za&~r^]"{t4by2t`<q4bfo^&!so5/~(nxk:7l\;#0w41u~w3i$g|>e/t;o<*`~?3.jyx+h)+^cn^j4td|>)~rs)vm#]:"&\fi;54%+z~fhe|w~\q|ui={54[b9tg*?@]g+q!mq]3jg2?eoo"chyat3k#7pq1u=.l]c14twa4tg#5k_""###
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);
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}
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#[test]
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fn random() {
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const ASCII_CHARS: &'static [u8] = br##"abcdefghijklmnopqrstuvwxyz0123456789-^\@[;:],./\!"#$%&'()~=~|`{+*}<>?_"##;
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let mut state = 88172645463325252u64;
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let mut data = Vec::with_capacity(100);
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let mut buf1 = Buffer::new();
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let mut buf2 = Buffer::new();
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for len in 0..100 {
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data.clear();
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for _ in 0..len {
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// xorshift
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state ^= state << 13;
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state ^= state >> 7;
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state ^= state << 17;
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let idx = state as usize % ASCII_CHARS.len();
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data.push(ASCII_CHARS[idx]);
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}
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let s = unsafe { std::str::from_utf8_unchecked(&*data) };
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buf1.clear();
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buf2.clear();
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unsafe {
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escape_to_buf(&*s, &mut buf1);
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naive::escape(
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&mut |s| buf2.write_str(s),
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s.as_ptr(),
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s.as_ptr(),
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s.as_ptr().add(s.len()),
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);
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}
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assert_eq!(buf1.as_str(), buf2.as_str());
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}
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}
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}
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