mirror of https://github.com/fafhrd91/actix-web
130 lines
4.1 KiB
Rust
130 lines
4.1 KiB
Rust
use std::{io, ptr};
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use bytes::{BufMut, BytesMut};
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use http::Version;
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const DEC_DIGITS_LUT: &[u8] = b"0001020304050607080910111213141516171819\
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2021222324252627282930313233343536373839\
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4041424344454647484950515253545556575859\
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6061626364656667686970717273747576777879\
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8081828384858687888990919293949596979899";
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pub(crate) const STATUS_LINE_BUF_SIZE: usize = 13;
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pub(crate) fn write_status_line(version: Version, mut n: u16, bytes: &mut BytesMut) {
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let mut buf: [u8; STATUS_LINE_BUF_SIZE] = *b"HTTP/1.1 000 ";
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match version {
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Version::HTTP_2 => buf[5] = b'2',
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Version::HTTP_10 => buf[7] = b'0',
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Version::HTTP_09 => {
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buf[5] = b'0';
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buf[7] = b'9';
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}
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_ => (),
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}
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// decode least significant 2 chars
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let d1 = ((n % 100) * 2) as usize;
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n /= 100;
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buf[10] = DEC_DIGITS_LUT[d1];
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buf[11] = DEC_DIGITS_LUT[d1+1];
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// decode last (most significant) char
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buf[9] = (n as u8) + b'0';
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bytes.put_slice(&buf);
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}
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/// NOTE: bytes object has to contain enough space
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pub fn write_content_length(mut n: usize, bytes: &mut BytesMut) {
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if n < 10 {
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let mut buf: [u8; 21] = *b"\r\ncontent-length: 0\r\n";
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buf[18] = (n as u8) + b'0';
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bytes.put_slice(&buf);
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} else if n < 100 {
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let mut buf: [u8; 22] = *b"\r\ncontent-length: 00\r\n";
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let d1 = n << 1;
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unsafe {
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ptr::copy_nonoverlapping(
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DEC_DIGITS_LUT.as_ptr().add(d1),
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buf.as_mut_ptr().offset(18),
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2,
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);
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}
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bytes.put_slice(&buf);
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} else if n < 1000 {
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let mut buf: [u8; 23] = *b"\r\ncontent-length: 000\r\n";
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// decode 2 more chars, if > 2 chars
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let d1 = (n % 100) << 1;
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n /= 100;
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unsafe {
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ptr::copy_nonoverlapping(
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DEC_DIGITS_LUT.as_ptr().add(d1),
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buf.as_mut_ptr().offset(19),
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2,
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)
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};
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// decode last 1
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buf[18] = (n as u8) + b'0';
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bytes.put_slice(&buf);
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} else {
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use std::fmt::Write;
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let _ignored = write!(bytes, "\r\ncontent-length: {}\r\n", n);
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}
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}
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pub(crate) struct Writer<'a>(pub &'a mut BytesMut);
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impl<'a> io::Write for Writer<'a> {
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fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
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self.0.extend_from_slice(buf);
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Ok(buf.len())
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}
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fn flush(&mut self) -> io::Result<()> {
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Ok(())
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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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#[test]
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fn test_write_content_length() {
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let mut bytes = BytesMut::new();
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bytes.reserve(50);
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write_content_length(0, &mut bytes);
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assert_eq!(bytes.take().freeze(), b"\r\ncontent-length: 0\r\n"[..]);
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bytes.reserve(50);
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write_content_length(9, &mut bytes);
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assert_eq!(bytes.take().freeze(), b"\r\ncontent-length: 9\r\n"[..]);
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bytes.reserve(50);
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write_content_length(10, &mut bytes);
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assert_eq!(bytes.take().freeze(), b"\r\ncontent-length: 10\r\n"[..]);
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bytes.reserve(50);
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write_content_length(99, &mut bytes);
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assert_eq!(bytes.take().freeze(), b"\r\ncontent-length: 99\r\n"[..]);
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bytes.reserve(50);
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write_content_length(100, &mut bytes);
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assert_eq!(bytes.take().freeze(), b"\r\ncontent-length: 100\r\n"[..]);
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bytes.reserve(50);
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write_content_length(101, &mut bytes);
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assert_eq!(bytes.take().freeze(), b"\r\ncontent-length: 101\r\n"[..]);
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bytes.reserve(50);
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write_content_length(998, &mut bytes);
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assert_eq!(bytes.take().freeze(), b"\r\ncontent-length: 998\r\n"[..]);
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bytes.reserve(50);
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write_content_length(1000, &mut bytes);
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assert_eq!(bytes.take().freeze(), b"\r\ncontent-length: 1000\r\n"[..]);
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bytes.reserve(50);
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write_content_length(1001, &mut bytes);
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assert_eq!(bytes.take().freeze(), b"\r\ncontent-length: 1001\r\n"[..]);
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bytes.reserve(50);
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write_content_length(5909, &mut bytes);
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assert_eq!(bytes.take().freeze(), b"\r\ncontent-length: 5909\r\n"[..]);
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}
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}
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