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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.

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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 org.apache.xml.security.utils;

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class UnsyncBufferedOutputStream extends FilterOutputStream {

    protected byte[] buffer;
    protected int count;

    public UnsyncBufferedOutputStream(OutputStream out) {
        super(out);
        buffer = new byte[8192];
    }

    public UnsyncBufferedOutputStream(OutputStream out, int size) {
        super(out);
        if (size <= 0) {
            throw new IllegalArgumentException("size must be > 0");
        }
        buffer = new byte[size];
    }

    @Override
    public void flush() throws IOException {
        flushInternal();
        out.flush();
    }

    @Override
    public void write(byte[] bytes, int offset, int length) throws IOException {
        if (length >= buffer.length) {
            flushInternal();
            out.write(bytes, offset, length);
            return;
        }

        // flush the internal buffer first if we have not enough space left
        if (length >= (buffer.length - count)) {
            flushInternal();
        }

        // the length is always less than (internalBuffer.length - count) here so arraycopy is safe
        System.arraycopy(bytes, offset, buffer, count, length);
        count += length;
    }

    @Override
    public void write(int oneByte) throws IOException {
        if (count == buffer.length) {
            out.write(buffer, 0, count);
            count = 0;
        }
        buffer[count++] = (byte) oneByte;
    }

    private void flushInternal() throws IOException {
        if (count > 0) {
            out.write(buffer, 0, count);
            count = 0;
        }
    }
}