instant-labs
/
instant-xml
mirror of https://github.com/instant-labs/instant-xml.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Decode hexadecimal character references

This commit is contained in:
Craig Bester 2023-10-19 01:15:26 +02:00 committed by Dirkjan Ochtman
parent 366cc05b08
commit 2595da57ce
1 changed files with 33 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
instant-xml/src/impls.rs
View File

@ -558,7 +558,7 @@ pub(crate) fn decode(input: &str) -> Result<Cow<'_, str>, Error> {
for (i, &b) in input.as_bytes().iter().enumerate() {
// use a state machine to find entities
state = match (state, b) {
(DecodeState::Normal, b'&') => DecodeState::Entity([0; 4], 0),
(DecodeState::Normal, b'&') => DecodeState::Entity([0; 6], 0),
(DecodeState::Normal, _) => DecodeState::Normal,
(DecodeState::Entity(chars, len), b';') => {
let decoded = match &chars[..len] {
@ -567,14 +567,26 @@ pub(crate) fn decode(input: &str) -> Result<Cow<'_, str>, Error> {
[b'g', b't'] => '>',
[b'l', b't'] => '<',
[b'q', b'u', b'o', b't'] => '"',
[b'#', b'x' | b'X', hex @ ..] => {
// Hexadecimal character reference e.g. "&#x007c;" -> '|'
str::from_utf8(hex)
.ok()
.and_then(|hex_str| u32::from_str_radix(hex_str, 16).ok())
.and_then(char::from_u32)
.filter(valid_xml_character)
.ok_or_else(|| {
Error::InvalidEntity(
String::from_utf8_lossy(&chars[..len]).into_owned(),
)
})?
}
[b'#', decimal @ ..] => {
// Decimal character reference e.g. "&#1234;" -> 'Ӓ'
str::from_utf8(decimal)
.ok()
.and_then(|decimal_str| u32::from_str(decimal_str).ok())
.and_then(char::from_u32)
// Valid character ranges per https://www.w3.org/TR/xml/#NT-Char
.filter(|c| matches!(c, '\u{9}' | '\u{A}' | '\u{D}' | '\u{20}'..='\u{D7FF}' | '\u{E000}'..='\u{FFFD}' | '\u{10000}'..='\u{10FFFF}'))
.filter(valid_xml_character)
.ok_or_else(|| {
Error::InvalidEntity(
String::from_utf8_lossy(&chars[..len]).into_owned(),
@ -599,8 +611,8 @@ pub(crate) fn decode(input: &str) -> Result<Cow<'_, str>, Error> {
DecodeState::Normal
}
(DecodeState::Entity(mut chars, len), b) => {
if len >= 4 {
let mut bytes = Vec::with_capacity(5);
if len >= 6 {
let mut bytes = Vec::with_capacity(7);
bytes.extend(&chars[..len]);
bytes.push(b);
return Err(Error::InvalidEntity(
@ -634,7 +646,12 @@ pub(crate) fn decode(input: &str) -> Result<Cow<'_, str>, Error> {
#[derive(Debug)]
enum DecodeState {
Normal,
Entity([u8; 4], usize),
Entity([u8; 6], usize),
}
/// Valid character ranges per https://www.w3.org/TR/xml/#NT-Char
fn valid_xml_character(c: &char) -> bool {
matches!(c, '\u{9}' | '\u{A}' | '\u{D}' | '\u{20}'..='\u{D7FF}' | '\u{E000}'..='\u{FFFD}' | '\u{10000}'..='\u{10FFFF}')
}
impl<'xml, T: FromXml<'xml>> FromXml<'xml> for Vec<T> {
@ -885,10 +902,20 @@ mod tests {
assert_eq!(decode("&amp; foo").unwrap(), "& foo");
assert_eq!(decode("foo &amp;").unwrap(), "foo &");
assert_eq!(decode("cbdtéda&amp;sü").unwrap(), "cbdtéda&sü");
// Decimal character references
assert_eq!(decode("&#1234;").unwrap(), "Ӓ");
assert_eq!(decode("foo &#9; bar").unwrap(), "foo \t bar");
assert_eq!(decode("foo &#124; bar").unwrap(), "foo | bar");
assert_eq!(decode("foo &#1234; bar").unwrap(), "foo Ӓ bar");
// Hexadecimal character references
assert_eq!(decode("&#xc4;").unwrap(), "Ä");
assert_eq!(decode("&#x00c4;").unwrap(), "Ä");
assert_eq!(decode("foo &#x9; bar").unwrap(), "foo \t bar");
assert_eq!(decode("foo &#x007c; bar").unwrap(), "foo | bar");
assert_eq!(decode("foo &#xc4; bar").unwrap(), "foo Ä bar");
assert_eq!(decode("foo &#x00c4; bar").unwrap(), "foo Ä bar");
assert_eq!(decode("foo &#x10de; bar").unwrap(), "foo პ bar");
assert!(decode("&").is_err());
assert!(decode("&#").is_err());
assert!(decode("&#;").is_err());