Copyright Microsoft Corporation
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.
/**
 * Copyright Microsoft Corporation
 * 
 * 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 com.microsoft.azure.storage.core;

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

RESERVED FOR INTERNAL USE.
Wraps a user-specified buffer in a stream.
/**
 * RESERVED FOR INTERNAL USE.
 * Wraps a user-specified buffer in a stream.
 */
public class WrappedByteArrayOutputStream extends OutputStream {

    final private int startingOffset;
    private byte[] buffer;
    private int offset;

    public WrappedByteArrayOutputStream(final byte[] buffer, final int bufferOffset) {
        this.buffer = buffer;
        this.offset = bufferOffset;
        this.startingOffset = bufferOffset;
    }
    
    public int getPosition() {
        return this.offset - this.startingOffset;
    }
    
    @Override
    public void write(int b) throws IOException {
        if (this.offset == this.buffer.length) {
            throw new IOException(SR.CONTENT_LENGTH_MISMATCH);
        }
        
        this.buffer[this.offset] = (byte) b;
        this.offset++;
    }
}