Comments on: Reading Password-Protected ZIP Files in Java http://blog.alutam.com/2009/10/31/reading-password-protected-zip-files-in-java/#utm_source=feed&utm_medium=feed&utm_campaign=feed Sharing useful tips from my "weekend projects" Thu, 29 Jul 2010 15:00:01 +0000 http://wordpress.org/?v=2.9.1 hourly 1 By: leon http://blog.alutam.com/2009/10/31/reading-password-protected-zip-files-in-java/comment-page-1/#comment-169 leon Thu, 29 Jul 2010 12:40:48 +0000 http://blog.alutam.com/?p=102#comment-169 ICSharpCode.SharpZipLib ICSharpCode.SharpZipLib

]]> By: Martin http://blog.alutam.com/2009/10/31/reading-password-protected-zip-files-in-java/comment-page-1/#comment-167 Martin Tue, 13 Jul 2010 13:17:29 +0000 http://blog.alutam.com/?p=102#comment-167 I'm not a C# expert. Not sure what libraries in .NET are available for handling ZIP files. I’m not a C# expert. Not sure what libraries in .NET are available for handling ZIP files.

]]> By: BILL http://blog.alutam.com/2009/10/31/reading-password-protected-zip-files-in-java/comment-page-1/#comment-166 BILL Mon, 05 Jul 2010 03:24:14 +0000 http://blog.alutam.com/?p=102#comment-166 What you writed is excellent！Thank you ! What you writed is excellent！Thank you !

]]> By: Niraj http://blog.alutam.com/2009/10/31/reading-password-protected-zip-files-in-java/comment-page-1/#comment-165 Niraj Sat, 03 Jul 2010 11:27:04 +0000 http://blog.alutam.com/?p=102#comment-165 how unzip if i do not know the password. how unzip if i do not know the password.

]]> By: Niraj http://blog.alutam.com/2009/10/31/reading-password-protected-zip-files-in-java/comment-page-1/#comment-164 Niraj Sat, 03 Jul 2010 07:10:26 +0000 http://blog.alutam.com/?p=102#comment-164 actually i am able to unzip zip file but when a password protected zip file is encountered , it fails to unzip it. actually i am able to unzip zip file but when a password protected zip file is encountered , it fails to unzip it.

]]> By: Niraj http://blog.alutam.com/2009/10/31/reading-password-protected-zip-files-in-java/comment-page-1/#comment-163 Niraj Sat, 03 Jul 2010 07:08:51 +0000 http://blog.alutam.com/?p=102#comment-163 hi martin, can above code be implemented in c#. hi martin,
can above code be implemented in c#.

]]> By: Junmat http://blog.alutam.com/2009/10/31/reading-password-protected-zip-files-in-java/comment-page-1/#comment-162 Junmat Mon, 28 Jun 2010 11:04:29 +0000 http://blog.alutam.com/?p=102#comment-162 Yes, I have already tried unzipping unencrypted zip file and it is fast. This should be fast because most of my zip files have 3 to 4 files inside. I'll try to look up your code and see if I can make some adjustments. Thanks for the code by the way. :) Yes, I have already tried unzipping unencrypted zip file and it is fast. This should be fast because most of my zip files have 3 to 4 files inside. I’ll try to look up your code and see if I can make some adjustments. Thanks for the code by the way. :)

]]> By: Martin http://blog.alutam.com/2009/10/31/reading-password-protected-zip-files-in-java/comment-page-1/#comment-161 Martin Mon, 28 Jun 2010 10:57:29 +0000 http://blog.alutam.com/?p=102#comment-161 Please try using a plain ZipInputStream with an unencrypted zip file (same content, but no password) and see how fast/slow is that. In case it is much faster, you can try to see if you can optimize my ZipDecryptInputStream with a profiler. In case it is similarly slow reading unencrypted zip files with plain ZipInputStream, looks like you will have to find some other way of unzipping archives. Please try using a plain ZipInputStream with an unencrypted zip file (same content, but no password) and see how fast/slow is that. In case it is much faster, you can try to see if you can optimize my ZipDecryptInputStream with a profiler. In case it is similarly slow reading unencrypted zip files with plain ZipInputStream, looks like you will have to find some other way of unzipping archives.

]]> By: Junmat http://blog.alutam.com/2009/10/31/reading-password-protected-zip-files-in-java/comment-page-1/#comment-160 Junmat Mon, 28 Jun 2010 10:48:51 +0000 http://blog.alutam.com/?p=102#comment-160 Hi! I used your code for my android project. It works for me but it is very slow. This is my code: FileInputStream fis = new FileInputStream(f); ZipDecryptInputStream zdis = new ZipDecryptInputStream(fis,"letmelearn~!@#$%"); ZipInputStream zis = new ZipInputStream(zdis); ZipEntry ze; while((ze = zis.getNextEntry()) != null){ if(ze.getName().equals("0001_2_01.jpg){ Bitmap bm = BitmapFactory.decodeStream(zis); // this takes over 3 minutes to continue break; } } So, I tried the code you posted here and not changing anything but it still very slow. Do you know what causes this problem? Thanks in advance. Hi! I used your code for my android project. It works for me but it is very slow. This is my code:
FileInputStream fis = new FileInputStream(f);
ZipDecryptInputStream zdis = new ZipDecryptInputStream(fis,”letmelearn~!@#$%”);
ZipInputStream zis = new ZipInputStream(zdis);
ZipEntry ze;
while((ze = zis.getNextEntry()) != null){
if(ze.getName().equals(“0001_2_01.jpg){
Bitmap bm = BitmapFactory.decodeStream(zis); // this takes over 3 minutes to continue
break;
}
}

So, I tried the code you posted here and not changing anything but it still very slow. Do you know what causes this problem? Thanks in advance.

]]> By: Martin http://blog.alutam.com/2009/10/31/reading-password-protected-zip-files-in-java/comment-page-1/#comment-159 Martin Wed, 23 Jun 2010 08:37:41 +0000 http://blog.alutam.com/?p=102#comment-159 I guess you would have to write your own ClassLoader implementation that loads classes in password-protected zips. You'd still need to have this bootstrapping code (the ClassLoader implementation) in a non-protected jar or class file. I guess you would have to write your own ClassLoader implementation that loads classes in password-protected zips. You’d still need to have this bootstrapping code (the ClassLoader implementation) in a non-protected jar or class file.

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