ByteBufferInputStream.java

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * 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 it.sephiroth.android.library.exif2;

import java.io.InputStream;
import java.nio.ByteBuffer;

class ByteBufferInputStream extends InputStream {

	private ByteBuffer mBuf;

	public ByteBufferInputStream( ByteBuffer buf ) {
		mBuf = buf;
	}

	@Override
	public int read() {
		if( ! mBuf.hasRemaining() ) {
			return - 1;
		}
		return mBuf.get() & 0xFF;
	}

	@Override
	public int read( byte[] bytes, int off, int len ) {
		if( ! mBuf.hasRemaining() ) {
			return - 1;
		}

		len = Math.min( len, mBuf.remaining() );
		mBuf.get( bytes, off, len );
		return len;
	}
}