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use std::io;
use http::frame::{FrameHeader, pack_header};
pub trait FrameBuilder: io::Write + io::Seek {
fn write_header(&mut self, header: FrameHeader) -> io::Result<()> {
self.write_all(&pack_header(&header))
}
fn overwrite_header(&mut self, header: FrameHeader) -> io::Result<()> {
let current = try!(self.seek(io::SeekFrom::Current(0)));
try!(self.seek(io::SeekFrom::Start(0)));
try!(self.write_header(header));
try!(self.seek(io::SeekFrom::Start(current)));
Ok(())
}
fn copy_bytes_from<R: io::Read>(&mut self, provider: &mut R) -> io::Result<u64>
where Self: Sized
{
io::copy(provider, self)
}
fn write_padding(&mut self, padding_length: u8) -> io::Result<()> {
for _ in 0..padding_length {
try!(self.write_all(&[0]));
}
Ok(())
}
fn write_u32(&mut self, num: u32) -> io::Result<()> {
self.write_all(&[(((num >> 24) & 0x000000FF) as u8),
(((num >> 16) & 0x000000FF) as u8),
(((num >> 8) & 0x000000FF) as u8),
(((num ) & 0x000000FF) as u8)])
}
}
impl FrameBuilder for io::Cursor<Vec<u8>> {}
#[cfg(test)]
mod tests {
use super::FrameBuilder;
use std::io::{self, Write};
use http::frame::pack_header;
#[test]
fn test_write_header_empty_buffer() {
let mut buf = io::Cursor::new(Vec::new());
let header = (10, 0x1, 0x0, 3);
let expected = pack_header(&header);
buf.write_header(header).unwrap();
let frame = buf.into_inner();
assert_eq!(frame, expected);
}
#[test]
fn test_write_header_and_payload_empty() {
let mut buf = io::Cursor::new(Vec::new());
let header = (10, 0x1, 0x0, 3);
let expected = {
let mut buf = Vec::new();
buf.extend(pack_header(&header).to_vec());
buf.extend(vec![1, 2, 3, 4]);
buf
};
buf.write_header(header).unwrap();
buf.write_all(&[1, 2, 3, 4]).unwrap();
let frame = buf.into_inner();
assert_eq!(frame, expected);
}
#[test]
fn test_rewrite_header_after_payload() {
let mut buf = io::Cursor::new(Vec::new());
let original_header = (10, 0x1, 0x0, 3);
let actual_header = (5, 0x0, 0x0, 5);
let expected = {
let mut buf = Vec::new();
buf.extend(pack_header(&actual_header).to_vec());
buf.extend(vec![1, 2, 3, 4]);
buf
};
assert!(original_header != actual_header);
buf.write_header(original_header).unwrap();
buf.write_all(&[1, 2, 3]).unwrap();
buf.overwrite_header(actual_header).unwrap();
buf.write_all(&[4]).unwrap();
let frame = buf.into_inner();
assert_eq!(frame, expected);
}
#[test]
fn test_write_padding() {
let mut buf = io::Cursor::new(Vec::new());
buf.write_padding(5).unwrap();
assert_eq!(buf.into_inner(), vec![0; 5]);
}
#[test]
fn test_write_u32() {
fn get_written(num: u32) -> Vec<u8> {
let mut buf = io::Cursor::new(Vec::new());
buf.write_u32(num).unwrap();
buf.into_inner()
}
assert_eq!(get_written(0x0), vec![0, 0, 0, 0]);
assert_eq!(get_written(0x1), vec![0, 0, 0, 1]);
assert_eq!(get_written(0x10), vec![0, 0, 0, 0x10]);
assert_eq!(get_written(0x10AB00CC), vec![0x10, 0xAB, 0, 0xCC]);
assert_eq!(get_written(0xFFFFFFFF), vec![0xFF, 0xFF, 0xFF, 0xFF]);
assert_eq!(get_written(0xEFFFFFFF), vec![0xEF, 0xFF, 0xFF, 0xFF]);
assert_eq!(get_written(0x7FFFFFFF), vec![0x7F, 0xFF, 0xFF, 0xFF]);
assert_eq!(get_written(0xFFFFFF7F), vec![0xFF, 0xFF, 0xFF, 0x7F]);
}
}