/*
* Copyright 2006-2017 ICEsoft Technologies Canada Corp.
*
* 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 org.icepdf.core.io;
import java.io.*;
import java.util.concurrent.locks.ReentrantLock;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* @author Mark Collette
* @since 2.0
*/
public class RandomAccessFileInputStream extends InputStream implements SeekableInput {
private static final Logger logger =
Logger.getLogger(RandomAccessFileInputStream.class.toString());
private long m_lMarkPosition;
private RandomAccessFile m_RandomAccessFile;
private final ReentrantLock lock = new ReentrantLock();
public static RandomAccessFileInputStream build(File file) throws FileNotFoundException {
RandomAccessFile raf = new RandomAccessFile(file, "r");
return new RandomAccessFileInputStream(raf);
}
protected RandomAccessFileInputStream(RandomAccessFile raf) {
super();
m_lMarkPosition = 0L;
m_RandomAccessFile = raf;
}
//
// InputStream overrides
//
public int read() throws IOException {
return m_RandomAccessFile.read();
}
public int read(byte[] buffer) throws IOException {
return m_RandomAccessFile.read(buffer);
}
public int read(byte[] buffer, int offset, int length) throws IOException {
return m_RandomAccessFile.read(buffer, offset, length);
}
public void close() throws IOException {
m_RandomAccessFile.close();
}
public int available() {
try {
return (int) (m_RandomAccessFile.getFilePointer());
} catch (IOException e) {
if (logger.isLoggable(Level.FINE)) {
logger.log(Level.WARNING, "Error calling available", e);
}
}
return 0;
}
public void mark(int readLimit) {
try {
m_lMarkPosition = m_RandomAccessFile.getFilePointer();
} catch (IOException e) {
throw new RuntimeException(e.toString());
}
}
public boolean markSupported() {
return true;
}
public void reset() throws IOException {
m_RandomAccessFile.seek(m_lMarkPosition);
}
public long skip(long n) throws IOException {
int nn = (int) (n & 0xFFFFFFFF);
return (long) m_RandomAccessFile.skipBytes(nn);
}
//
// SeekableInput implementation
// (which are not already covered by InputStream overrides)
//
public void seekAbsolute(long absolutePosition) throws IOException {
m_RandomAccessFile.seek(absolutePosition);
}
public void seekRelative(long relativeOffset) throws IOException {
long pos = m_RandomAccessFile.getFilePointer();
pos += relativeOffset;
if (pos < 0L)
pos = 0L;
m_RandomAccessFile.seek(pos);
}
public void seekEnd() throws IOException {
long end = m_RandomAccessFile.length();
seekAbsolute(end);
}
public long getAbsolutePosition() throws IOException {
return m_RandomAccessFile.getFilePointer();
}
public long getLength() throws IOException {
return m_RandomAccessFile.length();
}
public InputStream getInputStream() {
return this;
}
public void beginThreadAccess() {
lock.lock();
}
public void endThreadAccess() {
lock.unlock();
}
}