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utils.go
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71 lines (66 loc) · 1.41 KB
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package proxy
import (
"io"
"strconv"
"encoding/binary"
)
func toPort(port string) (buffer []byte) {
buffer = make([]byte, 2)
if port, err := strconv.ParseUint(port, 10, 16); err == nil {
binary.BigEndian.PutUint16(buffer, uint16(port))
return
}
return nil
}
func copy(dst io.Writer, src io.Reader) (written int64, err error) {
buf := make([]byte, 1024*1024)
return copyBuffer(dst, src, buf)
}
// copyBuffer is the actual implementation of Copy and CopyBuffer.
// if buf is nil, one is allocated.
func copyBuffer(dst io.Writer, src io.Reader, buf []byte) (written int64, err error) {
// If the reader has a WriteTo method, use it to do the copy.
// Avoids an allocation and a copy.
if wt, ok := src.(io.WriterTo); ok {
return wt.WriteTo(dst)
}
// Similarly, if the writer has a ReadFrom method, use it to do the copy.
if rt, ok := dst.(io.ReaderFrom); ok {
return rt.ReadFrom(src)
}
if buf == nil {
size := 32 * 1024
if l, ok := src.(*io.LimitedReader); ok && int64(size) > l.N {
if l.N < 1 {
size = 1
} else {
size = int(l.N)
}
}
buf = make([]byte, size)
}
for {
nr, er := src.Read(buf)
if nr > 0 {
nw, ew := dst.Write(buf[0:nr])
if nw > 0 {
written += int64(nw)
}
if ew != nil {
err = ew
break
}
if nr != nw {
err = io.ErrShortWrite
break
}
}
if er != nil {
if er != io.EOF {
err = er
}
break
}
}
return written, err
}