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Difference between revisions of "IPA File Format"
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| − | [[Image:IPAFile.png|thumb|IPA File Icon |
+ | [[Image:IPAFile.png|thumb|IPA File Icon from ''[[iTunes]] 11'']] |
| + | A '''IPA''' archive is the de facto way to package applications for [[iOS]]. The name has no ''official'' definition, but is commonly called ''iPhone Application'' by the [[iOS]] community. The file is just a renamed [[wikipedia:ZIP|ZIP]] archive. Although any computer with a ZIP archive reader can extract an IPA, the images the file are typically saved as [[Apple PNG]] instead of the standardized [[wikipedia:PNG|PNG]] format. In addition, the application binary is encrypted with [[Digital Rights Management|DRM]] which hinders the ability to examine the binary. |
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| − | A IPA file is an '''iPhone Application''' archive which stores an iPhone, or iPad application. Looking at the file signature (Magic Number) of a valid IPA File will yield ''50 4B 03 04'' in HEX or ''PK..'' in ASCII, this shows us that an IPA file is just a fancy ZIP file and can therefore be extracted by the same way a ZIP file would. Though any computer can extract an IPA's contents, the app's binary uses DRM that hinders users' ability to examine or redistribute the app. |
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== Structure == |
== Structure == |
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Revision as of 17:21, 21 March 2013
A IPA archive is the de facto way to package applications for iOS. The name has no official definition, but is commonly called iPhone Application by the iOS community. The file is just a renamed ZIP archive. Although any computer with a ZIP archive reader can extract an IPA, the images the file are typically saved as Apple PNG instead of the standardized PNG format. In addition, the application binary is encrypted with DRM which hinders the ability to examine the binary.
Structure
The basic structure of an IPA file is as follows;
- /iTunesArtwork
- /iTunesMetadata.plist
- /Payload/
- ApplicationName.app/
- ApplicationName
- Various other application files
- ApplicationName.app/
Use
Apple uses the IPA format for iOS applications in iTunes. Developers use the IPA format typically for Ad Hoc Distribution of apps to beta testers, IPAs can be created through Xcode. This requires an Apple Developer or Enterprise account if you want to distribute to non-jailbroken devices.
How to create
IPAs can be created either by hand or through Xcode's Product -> Archive (this requires an App Developer or Enterprise account) and can later be viewed through Organizer -> Archives. To create an IPA hand, build your application and locate the .app file for it. Create a root folder, inside this folder create another folder called 'Payload' and place your application in here. Next, create a 512x512 image for your icon, call it iTunesArtwork and place it in the root folder. Create an iTunesMetadata.plist file and place it in the root folder as well. ZIP the contents of the root folder and not the root folder itself, i.e. select the items inside the root folder and not the root folder itself. Use the following ZIP command to properly create IPA files;
zip -u -y -r -n .jpg:.JPG:.jpeg:.png:.PNG:.gif:.GIF:.Z:.gz:.zip:.zoo:.arc:.lzh:.rar:.arj:.mp3:.mp4:.m4a:.m4v:.ogg:.ogv:.avi:.flac:.aac IPAFileName.ipa ./*
