micro/codec/protorpc/netstring.go

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2015-11-28 21:54:38 +03:00
package protorpc
import (
"encoding/binary"
"io"
)
// WriteNetString writes data to a big-endian netstring on a Writer.
// Size is always a 32-bit unsigned int.
func WriteNetString(w io.Writer, data []byte) (written int, err error) {
size := make([]byte, 4)
binary.BigEndian.PutUint32(size, uint32(len(data)))
if written, err = w.Write(size); err != nil {
return
}
return w.Write(data)
}
// ReadNetString reads data from a big-endian netstring.
func ReadNetString(r io.Reader) (data []byte, err error) {
sizeBuf := make([]byte, 4)
_, err = r.Read(sizeBuf)
if err != nil {
return nil, err
}
size := binary.BigEndian.Uint32(sizeBuf)
if size == 0 {
return nil, nil
}
data = make([]byte, size)
_, err = r.Read(data)
if err != nil {
return nil, err
}
return
}