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dechunker.go
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/
dechunker.go
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/*
* Copyright (c) 2002-2020 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j.
*
* Licensed 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 bolt
import (
"encoding/binary"
"io"
)
func dechunkMessage(rd io.Reader, msgBuf []byte) ([]byte, error) {
sizeBuf := []byte{0x00, 0x00}
msgBuf = msgBuf[:0]
offset := 0
for {
// Read size of chunk
_, err := io.ReadFull(rd, sizeBuf)
if err != nil {
return msgBuf, err
}
chunkSize := int(binary.BigEndian.Uint16(sizeBuf))
// A chunk size of 0 means either end of current message or it is just a no op sent
// from server to keep connection alive.
if chunkSize == 0 {
if len(msgBuf) > 0 {
// End of current message
return msgBuf, nil
}
// A no op
continue
}
msgBuf = append(msgBuf, make([]byte, chunkSize)...)
chunkBuf := msgBuf[offset:]
offset += chunkSize
_, err = io.ReadFull(rd, chunkBuf)
if err != nil {
return msgBuf, err
}
}
}