001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.imaging.common.bytesource;
018
019import java.io.ByteArrayInputStream;
020import java.io.IOException;
021import java.io.InputStream;
022
023public class ByteSourceArray extends ByteSource {
024    private final byte[] bytes;
025
026    public ByteSourceArray(final String fileName, final byte[] bytes) {
027        super(fileName);
028        this.bytes = bytes;
029    }
030
031    public ByteSourceArray(final byte[] bytes) {
032        this(null, bytes);
033    }
034
035    @Override
036    public InputStream getInputStream() {
037        return new ByteArrayInputStream(bytes);
038    }
039
040    @Override
041    public byte[] getBlock(final long startLong, final int length) throws IOException {
042        final int start = (int) startLong;
043        // We include a separate check for int overflow.
044        if ((start < 0) || (length < 0) || (start + length < 0)
045                || (start + length > bytes.length)) {
046            throw new IOException("Could not read block (block start: " + start
047                    + ", block length: " + length + ", data length: "
048                    + bytes.length + ").");
049        }
050
051        final byte[] result = new byte[length];
052        System.arraycopy(bytes, start, result, 0, length);
053        return result;
054    }
055
056    @Override
057    public long getLength() {
058        return bytes.length;
059    }
060
061    @Override
062    public byte[] getAll() throws IOException {
063        return bytes;
064    }
065
066    @Override
067    public String getDescription() {
068        return bytes.length + " byte array";
069    }
070
071}