ByteSourceFile.java
/*
* 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.commons.imaging.bytesource;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.nio.file.Files;
import org.apache.commons.imaging.ImagingException;
import org.apache.commons.imaging.common.BinaryFunctions;
import org.apache.commons.io.RandomAccessFileMode;
class ByteSourceFile extends ByteSource {
private final File file;
ByteSourceFile(final File file) {
super(file.getName());
this.file = file;
}
@Override
public byte[] getByteArray(final long from, final int length) throws IOException {
try (RandomAccessFile raf = RandomAccessFileMode.READ_ONLY.create(file)) {
// We include a separate check for int overflow.
if ((from < 0) || (length < 0) || (from + length < 0) || (from + length > raf.length())) {
throw new ImagingException(
"Could not read block (block start: " + from + ", block length: " + length + ", data length: " + raf.length() + ").");
}
return BinaryFunctions.getRAFBytes(raf, from, length, "Could not read value from file");
}
}
@Override
public InputStream getInputStream() throws IOException {
return new BufferedInputStream(Files.newInputStream(file.toPath()));
}
@Override
public long size() {
return file.length();
}
}