Programmer Question
I have a Java application that uses the java.util.zip library to compress and decompress files. What I have is a zip file on the server (created by my application) and the client zipping some of his files and uploading the file to the server, but if there's no difference in the underlying files then I don't want to waste the time uploading. I figured that I could calculate the MD5 hash values of the client-side and server-side and see if they're the same, but what's happening is I use my application to decompress a zip file, and then without changing any of the underlying files, I use my application to re-compress it, but the old and new zip files have different MD5 hashes. Does anybody know why this is happening, and if there's a better way to compare two zip files? Thanks.
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