ZipCompare.java Source code

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Here is the source code for ZipCompare.java

Source

/*   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();
        }
    }
}