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use crate::{Error, Result, SlicePos, State, Status, iter::Bytes, simd, utils};
/// Represents a parsed header.
#[derive(Copy, Clone, Eq, PartialEq, Debug, Default)]
pub struct Header {
/// The name portion of a header.
///
/// A header name must be valid ASCII-US, so it's safe to store as a `&str`.
pub name: SlicePos,
/// The value portion of a header.
///
/// While headers **should** be ASCII-US, the specification allows for
/// values that may not be, and so the value is stored as bytes.
pub value: SlicePos,
}
/// Header parse result result.
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum HeaderParsed {
Header(usize),
Eof(usize),
}
impl Header {
/// Parse a buffer of bytes as header.
///
/// The return value, if complete and successful, includes the index of the
/// buffer that parsing stopped at, and a sliced reference to the parsed
/// headers. The length of the slice will be equal to the number of properly
/// parsed headers.
///
/// # Example
///
/// ```
/// use ntex_httparse::{Status, Header, HeaderParsed};
///
/// let buf = b"Host: foo.bar\nAccept: */*\n\nblah blah";
/// let mut header = Header::default();
/// assert_eq!(header.parse(buf), Ok(Status::Complete(HeaderParsed::Header(14))));
/// ```
pub fn parse(&mut self, src: &[u8]) -> Result<HeaderParsed> {
let mut st = State::default();
let mut bytes = Bytes::new(src, &mut st);
parse_header_iter_uninit(&mut bytes, self)
}
pub fn parse_with_state(&mut self, src: &[u8], st: &mut State) -> Result<HeaderParsed> {
parse_header_iter_uninit(&mut Bytes::new(src, st), self)
}
}
fn parse_header_iter_uninit(
bytes: &mut Bytes<'_, '_>,
header: &mut Header,
) -> Result<HeaderParsed> {
// header eof
if bytes.st.state == 0 {
// a newline here means the head is over!
let b = next!(bytes);
if b == b'\r' {
expect!(bytes.next() == b'\n' => Err(Error::NewLine));
return Ok(Status::Complete(HeaderParsed::Eof(
bytes.cursor() - bytes.start(),
)));
} else if b == b'\n' {
return Ok(Status::Complete(HeaderParsed::Eof(
bytes.cursor() - bytes.start(),
)));
} else if !utils::is_header_name_token(b) {
return Err(Error::HeaderName);
}
bytes.st.state = 1;
header.name.start = bytes.cursor() - 1;
}
// parse header name until colon
if bytes.st.state == 1 {
simd::match_header_name_vectored(bytes);
if next!(bytes) == b':' {
// SAFETY: previously bumped by 1 with next! -> always safe.
bytes.st.state = 2;
header.name.end = bytes.cursor() - 1;
} else {
return Err(Error::HeaderName);
}
}
let mut b;
// header value start position
if bytes.st.state == 2 {
// eat white space between colon and value
'whitespace_after_colon: loop {
b = next!(bytes);
if b == b' ' || b == b'\t' {
continue 'whitespace_after_colon;
}
if utils::is_header_value_token(b) {
bytes.st.state = 3;
header.value.start = bytes.cursor() - 1;
break 'whitespace_after_colon;
}
if b == b'\r' {
expect!(bytes.next() == b'\n' => Err(Error::HeaderValue));
} else if b != b'\n' {
return Err(Error::HeaderValue);
}
// This produces an empty slice that points to the beginning
// of the whitespace.
header.value.reset();
bytes.st.state = 0;
bytes.commit();
return Ok(Status::Complete(HeaderParsed::Header(bytes.cursor())));
}
}
// header value
if bytes.st.state == 3 {
// parse value till EOL
{
simd::match_header_value_vectored(bytes);
// check ctl
let b = next!(bytes);
if b == b'\r' {
expect!(bytes.next() == b'\n' => Err(Error::HeaderValue));
} else if b != b'\n' {
return Err(Error::HeaderValue);
}
// trim trailing whitespace in the header
let mut n = 1; // previous next() moves cursor to next item
while let Some(b) = bytes.peek_behind(n) {
if matches!(b, b' ' | b'\t' | b'\r' | b'\n') {
n += 1;
} else {
break;
}
}
header.value.end = bytes.cursor() - n + 1;
}
}
bytes.st.state = 0;
bytes.commit();
Ok(Status::Complete(HeaderParsed::Header(bytes.cursor())))
}