org.testifyproject.tukaani.xz.index.IndexEncoder Maven / Gradle / Ivy
/*
* IndexEncoder
*
* Author: Lasse Collin
*
* This file has been put into the public domain.
* You can do whatever you want with this file.
*/
package org.testifyproject.tukaani.xz.index;
import java.org.testifyproject.testifyproject.OutputStream;
import java.org.testifyproject.testifyproject.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.zip.CheckedOutputStream;
import org.testifyproject.tukaani.xz.org.testifyproject.testifyprojectmon.EncoderUtil;
import org.testifyproject.tukaani.xz.XZIOException;
public class IndexEncoder extends IndexBase {
private final ArrayList records = new ArrayList();
public IndexEncoder() {
super(new XZIOException("XZ Stream or its Index has grown too big"));
}
public void add(long unpaddedSize, long uncompressedSize)
throws XZIOException {
super.add(unpaddedSize, uncompressedSize);
records.add(new IndexRecord(unpaddedSize, uncompressedSize));
}
public void encode(OutputStream out) throws IOException {
java.util.zip.CRC32 crc32 = new java.util.zip.CRC32();
CheckedOutputStream outChecked = new CheckedOutputStream(out, crc32);
// Index Indicator
outChecked.write(0x00);
// Number of Records
EncoderUtil.encodeVLI(outChecked, recordCount);
// List of Records
for (Iterator i = records.iterator(); i.hasNext(); ) {
IndexRecord record = (IndexRecord)i.next();
EncoderUtil.encodeVLI(outChecked, record.unpadded);
EncoderUtil.encodeVLI(outChecked, record.uncompressed);
}
// Index Padding
for (int i = getIndexPaddingSize(); i > 0; --i)
outChecked.write(0x00);
// CRC32
long value = crc32.getValue();
for (int i = 0; i < 4; ++i)
out.write((byte)(value >>> (i * 8)));
}
}