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use std::io;
use bstr::{BString, ByteSlice};
use quick_error::quick_error;
quick_error! {
#[derive(Debug)]
enum Error {
NewlineInHeaderValue(value: BString) {
display("Newlines are not allowed in header values: {:?}", value)
}
EmptyValue {
display("Header values must not be empty")
}
}
}
impl From<Error> for io::Error {
fn from(other: Error) -> io::Error {
io::Error::new(io::ErrorKind::Other, other)
}
}
pub fn header_field_multi_line(name: &[u8], value: &[u8], mut out: impl io::Write) -> io::Result<()> {
let mut lines = value.as_bstr().lines();
trusted_header_field(name, lines.next().expect("non-empty value"), &mut out)?;
for line in lines {
out.write_all(SPACE)?;
out.write_all(line)?;
out.write_all(NL)?;
}
if let Some(b) = value.last() {
if *b == b'\n' {
out.write_all(SPACE)?;
out.write_all(NL)?;
}
}
Ok(())
}
pub fn trusted_header_field(name: &[u8], value: &[u8], mut out: impl io::Write) -> io::Result<()> {
out.write_all(name)?;
out.write_all(SPACE)?;
out.write_all(value)?;
out.write_all(NL)
}
pub fn trusted_header_signature(
name: &[u8],
value: &git_actor::SignatureRef<'_>,
mut out: impl io::Write,
) -> io::Result<()> {
out.write_all(name)?;
out.write_all(SPACE)?;
value.write_to(&mut out)?;
out.write_all(NL)
}
pub fn trusted_header_id(name: &[u8], value: &git_hash::ObjectId, mut out: impl io::Write) -> io::Result<()> {
out.write_all(name)?;
out.write_all(&SPACE[..])?;
value.write_hex_to(&mut out)?;
out.write_all(&NL[..])
}
pub fn header_field(name: &[u8], value: &[u8], out: impl io::Write) -> io::Result<()> {
if value.is_empty() {
return Err(Error::EmptyValue.into());
}
if value.find(NL).is_some() {
return Err(Error::NewlineInHeaderValue(value.into()).into());
}
trusted_header_field(name, value, out)
}
pub(crate) const NL: &[u8; 1] = b"\n";
pub(crate) const SPACE: &[u8; 1] = b" ";