/* 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.
*/
package zipcompare;
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(); }
}
}