/*
* 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.ByteArrayInputStream;
import java.io.InputStream;
import java.util.concurrent.locks.ReentrantLock;
import java.util.logging.Logger;
/**
* @author Mark Collette
* @since 2.0
*/
public class SeekableByteArrayInputStream extends ByteArrayInputStream implements SeekableInput {
private static final Logger log =
Logger.getLogger(SeekableByteArrayInputStream.class.toString());
private int m_iBeginningOffset;
private final ReentrantLock lock = new ReentrantLock();
public SeekableByteArrayInputStream(byte buf[]) {
super(buf);
m_iBeginningOffset = 0;
}
public SeekableByteArrayInputStream(byte buf[], int offset, int length) {
super(buf, offset, length);
m_iBeginningOffset = offset;
}
//
// SeekableInput implementation
// (which are not already covered by InputStream overrides)
//
public void seekAbsolute(long absolutePosition) {
int absPos = (int) (absolutePosition & 0xFFFFFFFF);
pos = m_iBeginningOffset + absPos;
}
public void seekRelative(long relativeOffset) {
int relOff = (int) (relativeOffset & 0xFFFFFFFF);
int currPos = pos + relOff;
if (currPos < m_iBeginningOffset)
currPos = m_iBeginningOffset;
pos = currPos;
}
public void seekEnd() {
seekAbsolute(getLength());
}
public long getAbsolutePosition() {
int absPos = pos - m_iBeginningOffset;
return (((long) absPos) & 0xFFFFFFFF);
}
public long getLength() {
int len = count - m_iBeginningOffset;
return (((long) len) & 0xFFFFFFFF);
}
public InputStream getInputStream() {
return this;
}
public void beginThreadAccess() {
lock.lock();
}
public void endThreadAccess() {
lock.unlock();
}
}