nordic-dev.net/rust
nordic-dev.net/rust
2
0
Fork 0
mirror of https://github.com/rust-lang/rust.git synced 2024-11-01 06:51:58 +00:00
Code Issues Packages Projects Releases Wiki Activity

libcore: rewrite io::MemBuffer.write to use memcpy (#2004)

Browse Source
This commit is contained in:
Erick Tryzelaar 2012-08-26 21:21:59 -07:00
parent 7bb65848a1
commit 9074d9b581
1 changed files with 13 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
src/libcore/io.rs
View File

@ -663,24 +663,21 @@ type MemBuffer = @{buf: DVec<u8>, mut pos: uint};
impl MemBuffer: Writer {
fn write(v: &[const u8]) {
// Fast path.
let vlen = vec::len(v);
let buf_len = self.buf.len();
if self.pos == buf_len {
self.buf.push_all(v);
self.pos += vlen;
return;
}
do self.buf.swap |buf| {
let mut buf <- buf;
let v_len = v.len();
let buf_len = buf.len();
// FIXME #2004--use memcpy here?
let mut pos = self.pos, vpos = 0u;
while vpos < vlen && pos < buf_len {
self.buf.set_elt(pos, copy v[vpos]);
pos += 1u;
vpos += 1u;
let count = uint::max(&buf_len, &(self.pos + v_len));
vec::reserve(buf, count);
unsafe { vec::unsafe::set_len(buf, count); }
vec::u8::memcpy(vec::mut_view(buf, self.pos, count), v, v_len);
self.pos += v_len;
buf
}
self.buf.push_slice(v, vpos, vlen);
self.pos += vlen;
}
fn seek(offset: int, whence: SeekStyle) {
let pos = self.pos;