org.apache.wss4j.common.util.CRLFOutputStream Maven / Gradle / Ivy
/**
* 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 org.apache.wss4j.common.util;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
public class CRLFOutputStream extends FilterOutputStream {
private static final byte CR = '\r';
private static final byte LF = '\n';
private static final byte[] CRLF = new byte[]{CR, LF};
private boolean lastByteCR = false;
public CRLFOutputStream(OutputStream out) {
super(out);
}
@Override
public void write(int b) throws IOException {
if (b == CR) {
out.write(CRLF);
lastByteCR = true;
} else if (b == LF) {
if (lastByteCR) {
lastByteCR = false;
} else {
out.write(CRLF);
}
} else {
out.write(b);
lastByteCR = false;
}
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
int start = off;
for (int i = off; i < len; i++) {
if (b[i] == CR) {
out.write(b, start, i + 1 - start);
out.write(LF);
lastByteCR = true;
start = i + 1;
} else if (b[i] == LF) {
if (lastByteCR) {
lastByteCR = false;
start++;
} else {
int l = i - start;
if (l > 0) {
out.write(b, start, l);
}
out.write(CRLF);
start = i + 1;
}
} else {
lastByteCR = false;
}
}
out.write(b, start, len - start);
}
}