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zip / unzip uploaded files seamlesslyI am developing a website which allows a user to upload documents (MS Word,
PDF, etc) to a folder located beneath the website root. This works fine. However, for storage space and security reasons, I would like to have the process compress the file with encryption prior to writing it to the folder. Perhaps the filename could be the same as the original, but with an additional .zip extention. For example: sales2004.xls.zip. When the user clicks on a link to download the file, I would like to have them download an uncompressed version of the file without the zip extension, so it is transparent from the user's perspective. Are there any free libraries to compress / uncompress the pkzip format with encryption? Would the best approach for making this a seamless operation for users be to program around the file stream? Any general advice or alternative implementations from someone who has done something similar before? If I was you I'd first try using the J# zip classes:
http://msdn.microsoft.com/msdnmag/issues/03/06/ZipCompression/default.aspx Or I've heard of people having success with this code: http://www.icsharpcode.net/OpenSource/SharpZipLib/Default.aspx Or you could consider calling a command line utility like this: http://www.i386.info/software/zip23xn.zip Or you could consider a 3rd party component such as this: http://www.xceedsoft.com/products/zipnet Perhaps this free PDF code will also be of use to you: http://www.ujihara.jp/iTextdotNET/en/index.html Show quoteHide quote "bradley" <some***@microsoft.com> wrote in message news:OukFYf3aFHA.3196@TK2MSFTNGP14.phx.gbl... >I am developing a website which allows a user to upload documents (MS Word, > PDF, etc) to a folder located beneath the website root. This works fine. > However, for storage space and security reasons, I would like to have the > process compress the file with encryption prior to writing it to the > folder. > Perhaps the filename could be the same as the original, but with an > additional .zip extention. For example: sales2004.xls.zip. When the user > clicks on a link to download the file, I would like to have them download > an > uncompressed version of the file without the zip extension, so it is > transparent from the user's perspective. > Are there any free libraries to compress / uncompress the pkzip format > with > encryption? > Would the best approach for making this a seamless operation for users be > to > program around the file stream? > Any general advice or alternative implementations from someone who has > done > something similar before? > > What you seem to need is a component that can zip/unzip with support
for the latest Zip format, which offers AES strong encryption. There are, to my knowledge, no free libraries that support the latest Zip format. That is asking a lot from a free library. Show quoteHide quote On Tue, 7 Jun 2005 11:42:41 -0400, "bradley" <some***@microsoft.com> wrote: >I am developing a website which allows a user to upload documents (MS Word, >PDF, etc) to a folder located beneath the website root. This works fine. >However, for storage space and security reasons, I would like to have the >process compress the file with encryption prior to writing it to the folder. >Perhaps the filename could be the same as the original, but with an >additional .zip extention. For example: sales2004.xls.zip. When the user >clicks on a link to download the file, I would like to have them download an >uncompressed version of the file without the zip extension, so it is >transparent from the user's perspective. >Are there any free libraries to compress / uncompress the pkzip format with >encryption? >Would the best approach for making this a seamless operation for users be to >program around the file stream? >Any general advice or alternative implementations from someone who has done >something similar before? > -- Alex Leblanc Xceed Software Inc. http://www.xceedsoft.com High-quality ActiveX and .NET libraries and controls Email: xLebla***@xceedsoft.com (remove the first 'x')  
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