Zip Compare
/* Copyright 2004 The Apache Software Foundation
*
* 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.
*/
import java.util.zip.ZipFile;
import java.util.zip.ZipEntry;
import java.util.*;
import java.io.IOException;
import java.io.InputStream;
public class ZipCompare
{
public static void main(String[] args)
{
if (args.length != 2)
{
System.out.println("Usage: zipcompare [file1] [file2]");
System.exit(1);
}
ZipFile file1;
try { file1 = new ZipFile(args[0]); }
catch (IOException e) { System.out.println("Could not open zip file " + args[0] + ": " + e); System.exit(1); return; }
ZipFile file2;
try { file2 = new ZipFile(args[1]); }
catch (IOException e) { System.out.println("Could not open zip file " + args[0] + ": " + e); System.exit(1); return; }
System.out.println("Comparing " + args[0] + " with " + args[1] + ":");
Set set1 = new LinkedHashSet();
for (Enumeration e = file1.entries(); e.hasMoreElements(); )
set1.add(((ZipEntry)e.nextElement()).getName());
Set set2 = new LinkedHashSet();
for (Enumeration e = file2.entries(); e.hasMoreElements(); )
set2.add(((ZipEntry)e.nextElement()).getName());
int errcount = 0;
int filecount = 0;
for (Iterator i = set1.iterator(); i.hasNext(); )
{
String name = (String)i.next();
if (!set2.contains(name))
{
System.out.println(name + " not found in " + args[1]);
errcount += 1;
continue;
}
try
{
set2.remove(name);
if (!streamsEqual(file1.getInputStream(file1.getEntry(name)), file2.getInputStream(file2.getEntry(name))))
{
System.out.println(name + " does not match");
errcount += 1;
continue;
}
}
catch (Exception e)
{
System.out.println(name + ": IO Error " + e);
e.printStackTrace();
errcount += 1;
continue;
}
filecount += 1;
}
for (Iterator i = set2.iterator(); i.hasNext(); )
{
String name = (String)i.next();
System.out.println(name + " not found in " + args[0]);
errcount += 1;
}
System.out.println(filecount + " entries matched");
if (errcount > 0)
{
System.out.println(errcount + " entries did not match");
System.exit(1);
}
System.exit(0);
}
static boolean streamsEqual(InputStream stream1, InputStream stream2) throws IOException
{
byte[] buf1 = new byte[4096];
byte[] buf2 = new byte[4096];
boolean done1 = false;
boolean done2 = false;
try
{
while (!done1)
{
int off1 = 0;
int off2 = 0;
while (off1 < buf1.length)
{
int count = stream1.read(buf1, off1, buf1.length - off1);
if (count < 0)
{
done1 = true;
break;
}
off1 += count;
}
while (off2 < buf2.length)
{
int count = stream2.read(buf2, off2, buf2.length - off2);
if (count < 0)
{
done2 = true;
break;
}
off2 += count;
}
if (off1 != off2 || done1 != done2)
return false;
for (int i = 0; i < off1; i++)
{
if (buf1[i] != buf2[i])
return false;
}
}
return true;
}
finally { stream1.close(); stream2.close(); }
}
}
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