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io.go
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io.go
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package libp2putil
import (
"bufio"
"io"
"github.com/multiformats/go-varint"
"google.golang.org/protobuf/proto"
)
// UvarintWriter writes protobuf blocks.
type UvarintWriter struct {
w io.Writer
}
// NewDelimitedWriter returns a new UvarintWriter.
func NewDelimitedWriter(w io.Writer) *UvarintWriter {
return &UvarintWriter{w}
}
// WriteBlk writes protobuf block.
func (uw *UvarintWriter) WriteBlk(blk proto.Message) (err error) {
var data []byte
lenBuf := make([]byte, varint.MaxLenUvarint63)
data, err = proto.Marshal(blk)
if err != nil {
return err
}
length := uint64(len(data))
n := varint.PutUvarint(lenBuf, length)
_, err = uw.w.Write(lenBuf[:n])
if err != nil {
return err
}
_, err = uw.w.Write(data)
return err
}
// UvarintReader read protobuf blocks.
type UvarintReader struct {
r *bufio.Reader
}
// NewDelimitedReader returns a new UvarintReader.
func NewDelimitedReader(r io.Reader) *UvarintReader {
return &UvarintReader{r: bufio.NewReader(r)}
}
// ReadBlk read protobuf blocks.
func (ur *UvarintReader) ReadBlk(blk proto.Message) error {
length64, err := varint.ReadUvarint(ur.r)
if err != nil {
return err
}
buf := make([]byte, length64)
if _, err := io.ReadFull(ur.r, buf); err != nil {
return err
}
return proto.Unmarshal(buf, blk)
}