/*
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* XZSeekDecDemo
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*
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* Author: Lasse Collin <lasse.collin@tukaani.org>
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*
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* This file has been put into the public domain.
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* You can do whatever you want with this file.
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*/
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import java.io.*;
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import org.tukaani.xz.*;
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/**
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* Decompresses a .xz file in random access mode to standard output.
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* <p>
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* Arguments: filename [offset1 length1] [offset2 length2] ...
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* <p>
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* If only the filename is given, the whole file is decompressed. The only
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* difference to XZDecDemo is that this will still use the random access code.
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* <p>
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* If one or more of the offset-length pairs are given,
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* for each pair, <code>length</code> number of bytes are
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* decompressed from <code>offset</code>.
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*/
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class XZSeekDecDemo {
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public static void main(String[] args) throws Exception {
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SeekableFileInputStream file = new SeekableFileInputStream(args[0]);
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SeekableXZInputStream in = new SeekableXZInputStream(file);
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System.err.println("Number of XZ Streams: " + in.getStreamCount());
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System.err.println("Number of XZ Blocks: " + in.getBlockCount());
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System.err.println("Uncompressed size: " + in.length() + " B");
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System.err.println("Largest XZ Block size: "
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+ in.getLargestBlockSize() + " B");
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System.err.print("List of Check IDs:");
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int checkTypes = in.getCheckTypes();
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for (int i = 0; i < 16; ++i)
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if ((checkTypes & (1 << i)) != 0)
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System.err.print(" " + i);
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System.err.println();
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System.err.println("Index memory usage: "
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+ in.getIndexMemoryUsage() + " KiB");
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byte[] buf = new byte[8192];
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if (args.length == 1) {
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int size;
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while ((size = in.read(buf)) != -1)
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System.out.write(buf, 0, size);
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} else {
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for (int i = 1; i < args.length; i += 2) {
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int pos = Integer.parseInt(args[i]);
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int len = Integer.parseInt(args[i + 1]);
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in.seek(pos);
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while (len > 0) {
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int size = Math.min(len, buf.length);
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size = in.read(buf, 0, size);
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if (size == -1) {
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System.err.println("Error: End of file reached");
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System.exit(1);
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}
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System.out.write(buf, 0, size);
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len -= size;
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}
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}
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}
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}
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}
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