/*
* Copyright 2002-2016 the original author or authors.
*
* 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 org.springframework.integration.ip.tcp.serializer;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* Reads data in an InputStream to a byte[]; data must be terminated by \r\n
* (not included in resulting byte[]).
* Writes a byte[] to an OutputStream and adds \r\n.
*
* @author Gary Russell
* @since 2.0
*/
public class ByteArrayCrLfSerializer extends AbstractPooledBufferByteArraySerializer {
/**
* A single reusable instance.
*/
public static final ByteArrayCrLfSerializer INSTANCE = new ByteArrayCrLfSerializer();
private static final byte[] CRLF = "\r\n".getBytes();
/**
* Reads the data in the inputStream to a byte[]. Data must be terminated
* by CRLF (\r\n). Throws a {@link SoftEndOfStreamException} if the stream
* is closed immediately after the \r\n (i.e. no data is in the process of
* being read).
*/
@Override
public byte[] doDeserialize(InputStream inputStream, byte[] buffer) throws IOException {
int n = this.fillToCrLf(inputStream, buffer);
return this.copyToSizedArray(buffer, n);
}
public int fillToCrLf(InputStream inputStream, byte[] buffer) throws IOException {
int n = 0;
int bite;
if (logger.isDebugEnabled()) {
logger.debug("Available to read: " + inputStream.available());
}
try {
while (true) {
bite = inputStream.read();
if (bite < 0 && n == 0) {
throw new SoftEndOfStreamException("Stream closed between payloads");
}
checkClosure(bite);
if (n > 0 && bite == '\n' && buffer[n - 1] == '\r') {
break;
}
buffer[n++] = (byte) bite;
if (n >= this.maxMessageSize) {
throw new IOException("CRLF not found before max message length: " + this.maxMessageSize);
}
}
return n - 1; // trim \r
}
catch (SoftEndOfStreamException e) {
throw e;
}
catch (IOException e) {
publishEvent(e, buffer, n);
throw e;
}
catch (RuntimeException e) {
publishEvent(e, buffer, n);
throw e;
}
}
/**
* Writes the byte[] to the stream and appends \r\n.
*/
@Override
public void serialize(byte[] bytes, OutputStream outputStream) throws IOException {
outputStream.write(bytes);
outputStream.write(CRLF);
}
}