sha1verification.java

java 文件下载器。可自定义

// Decompiled by Jad v1.5.8e2. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://kpdus.tripod.com/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi space 
// Source File Name:   SHA1Verification.java

package org.gudy.azureus2.core3.util.test;

import java.io.*;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.security.MessageDigest;
import java.util.Arrays;
import java.util.Random;
import org.gudy.azureus2.core3.util.*;

public class SHA1Verification
{

	public static final String dirname = (new StringBuilder()).append("D:").append(System.getProperty("file.separator")).append("testdir").toString();

	public SHA1Verification()
	{
	}

	public static void main(String args[])
	{
		if (!(new File(dirname)).exists())
			createTestFiles();
		runTests();
	}

	public static void createTestFiles()
	{
		try
		{
			System.out.println("Creating test files ... ");
			Random rand = new Random();
			String rootname = "f-";
			long sizes[] = {
				0L, 1L, 0x2faf080L
			};
			File testdir = new File(dirname);
			FileUtil.mkdirs(testdir);
			for (int i = 0; i < sizes.length; i++)
			{
				long size = sizes[i];
				File file = new File(testdir, (new StringBuilder()).append(rootname).append(String.valueOf(size)).toString());
				System.out.println((new StringBuilder()).append(file.getName()).append("...").toString());
				FileChannel fc = (new RandomAccessFile(file, "rw")).getChannel();
				ByteBuffer bb;
				for (long position = 0L; position < size; position += fc.write(bb))
				{
					long remaining = size - position;
					if (remaining > 0xfa000L)
						remaining = 0xfa000L;
					byte buffer[] = new byte[(new Long(remaining)).intValue()];
					rand.nextBytes(buffer);
					bb = ByteBuffer.wrap(buffer);
				}

				fc.close();
			}

			System.out.println("DONE\n");
		}
		catch (Exception e)
		{
			Debug.printStackTrace(e);
		}
	}

	public static void runTests()
	{
		try
		{
			MessageDigest sha1Sun = MessageDigest.getInstance("SHA-1");
			SHA1 sha1Gudy = new SHA1();
			ByteBuffer buffer = ByteBuffer.allocate(0x100000);
			File dir = new File(dirname);
			File files[] = dir.listFiles();
			for (int i = 0; i < files.length; i++)
			{
				FileChannel fc = (new RandomAccessFile(files[i], "r")).getChannel();
				System.out.println((new StringBuilder()).append("Testing ").append(files[i].getName()).append(" ...").toString());
				for (; fc.position() < fc.size(); buffer.clear())
				{
					fc.read(buffer);
					buffer.flip();
					byte raw[] = new byte[buffer.limit()];
					System.arraycopy(buffer.array(), 0, raw, 0, raw.length);
					sha1Gudy.update(buffer);
					sha1Gudy.saveState();
					ByteBuffer bb = ByteBuffer.wrap(new byte[56081]);
					sha1Gudy.digest(bb);
					sha1Gudy.restoreState();
					sha1Sun.update(raw);
				}

				byte sun[] = sha1Sun.digest();
				sha1Sun.reset();
				byte gudy[] = sha1Gudy.digest();
				sha1Gudy.reset();
				if (Arrays.equals(sun, gudy))
					System.out.println("  SHA1-Gudy: OK");
				else
					System.out.println("  SHA1-Gudy: FAILED");
				buffer.clear();
				fc.close();
				System.out.println();
			}

		}
		catch (Throwable e)
		{
			Debug.printStackTrace(e);
		}
	}

}