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use std::io;
use super::u16_to_hex;
use crate::{encode::Error, Channel, DELIMITER_LINE, ERR_PREFIX, FLUSH_LINE, MAX_DATA_LEN, RESPONSE_END_LINE};
/// Write a response-end message to `out`.
pub fn response_end_to_write(mut out: impl io::Write) -> io::Result<usize> {
out.write_all(RESPONSE_END_LINE).map(|_| 4)
}
/// Write a delim message to `out`.
pub fn delim_to_write(mut out: impl io::Write) -> io::Result<usize> {
out.write_all(DELIMITER_LINE).map(|_| 4)
}
/// Write a flush message to `out`.
pub fn flush_to_write(mut out: impl io::Write) -> io::Result<usize> {
out.write_all(FLUSH_LINE).map(|_| 4)
}
/// Write an error `message` to `out`.
pub fn error_to_write(message: &[u8], out: impl io::Write) -> io::Result<usize> {
prefixed_data_to_write(ERR_PREFIX, message, out)
}
/// Write `data` of `kind` to `out` using side-band encoding.
pub fn band_to_write(kind: Channel, data: &[u8], out: impl io::Write) -> io::Result<usize> {
prefixed_data_to_write(&[kind as u8], data, out)
}
/// Write a `data` message to `out`.
pub fn data_to_write(data: &[u8], out: impl io::Write) -> io::Result<usize> {
prefixed_data_to_write(&[], data, out)
}
/// Write a `text` message to `out`, which is assured to end in a newline.
pub fn text_to_write(text: &[u8], out: impl io::Write) -> io::Result<usize> {
prefixed_and_suffixed_data_to_write(&[], text, &[b'\n'], out)
}
fn prefixed_data_to_write(prefix: &[u8], data: &[u8], out: impl io::Write) -> io::Result<usize> {
prefixed_and_suffixed_data_to_write(prefix, data, &[], out)
}
fn prefixed_and_suffixed_data_to_write(
prefix: &[u8],
data: &[u8],
suffix: &[u8],
mut out: impl io::Write,
) -> io::Result<usize> {
let data_len = prefix.len() + data.len() + suffix.len();
if data_len > MAX_DATA_LEN {
return Err(io::Error::new(
io::ErrorKind::Other,
Error::DataLengthLimitExceeded {
length_in_bytes: data_len,
},
));
}
if data.is_empty() {
return Err(io::Error::new(io::ErrorKind::Other, Error::DataIsEmpty));
}
let data_len = data_len + 4;
let buf = u16_to_hex(data_len as u16);
out.write_all(&buf)?;
if !prefix.is_empty() {
out.write_all(prefix)?;
}
out.write_all(data)?;
if !suffix.is_empty() {
out.write_all(suffix)?;
}
Ok(data_len)
}
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