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bytes.go
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/
bytes.go
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// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with
// the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package coder
import (
"fmt"
"io"
"github.com/apache/beam/sdks/go/pkg/beam/core/util/ioutilx"
"github.com/apache/beam/sdks/go/pkg/beam/internal/errors"
)
// EncodeByte encodes a single byte.
func EncodeByte(v byte, w io.Writer) error {
// Encoding: raw byte.
if _, err := ioutilx.WriteUnsafe(w, []byte{v}); err != nil {
return fmt.Errorf("error encoding byte: %v", err)
}
return nil
}
// DecodeByte decodes a single byte.
func DecodeByte(r io.Reader) (byte, error) {
// Encoding: raw byte
var b [1]byte
if err := ioutilx.ReadNBufUnsafe(r, b[:]); err != nil {
if err == io.EOF {
return 0, err
}
return 0, errors.Wrap(err, "error decoding byte")
}
return b[0], nil
}
// EncodeBytes encodes a []byte with a length prefix per the beam protocol.
func EncodeBytes(v []byte, w io.Writer) error {
// Encoding: size (varint) + raw data
size := len(v)
if err := EncodeVarInt((int64)(size), w); err != nil {
return err
}
_, err := w.Write(v)
return err
}
// DecodeBytes decodes a length prefixed []byte according to the beam protocol.
func DecodeBytes(r io.Reader) ([]byte, error) {
// Encoding: size (varint) + raw data
size, err := DecodeVarInt(r)
if err != nil {
return nil, err
}
return ioutilx.ReadN(r, (int)(size))
}