Adds zip functionality to BlitzPlus & Blitz3D. Extract files, create archives and compress banks.
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Blitz.ZipApi - Quick Information


Blitz.ZipApi brings zip functionality to BlitzPlus and Blitz3D. Now you can extract files from zip files, as well as create and modify your own zips. There is also support for compression and decompression of Blitz banks.

The userlib binary is based on the work of the Zlib project, which can be found at

Quick Links

Project Homepage: :

Online Documentation :

Source Code :

Quick Installation

  • Copy "zlibwapi.dll" and "zlibwapi.decls" to the appropriate userlibs folder

  • Include "", "" and "" into your projects.

  • To add documentation to the Blitz manual, copy the contents of "blitz-docs" to the "help/commands/2d_commands" of your Blitz installation.


This library has been tested, but some bugs may still be present. You can report bugs at the sodaware bug tracker, and also add feature requests.

This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software.

Version History

Version 1.2 - August 27th, 2007

  • Added ZipApi_ExtractFileAsBank. Files can be read from a zip straight into a bank.

  • Added ZipApi_CompressBank and ZipApi_UnCompressBank. These are similar to ZipApi_Compress and ZipApi_UnCompress, but they store the original data size, which prevents guesswork and removes buffer errors.

  • Added ZipApi_VerifyZipFileHeader, which checks to see if a file has the correct header for a zip file.

  • Added ZipApi_GetUnpackedSize, which calculates the total uncompressed size of a zip archive.

  • Fixed bug where trying to extract a password protected file without a password would throw no error.

  • Fixed bug where trying to extract a file that didn't exist wouldn't return an error.

  • Fixed several extraction bugs, mostly involving incorrect slashes.

Version 1.1 - April 23rd, 2007

Fixed several errors in the online documentation, and added the following improvements to the library:

  • ZipApi_AddBankAsFile and ZipApi_AddFile now support the "password" field which allows files to be encrypted.

  • ZipApi_ExtractFile now supports optional password field for extracting protected files.

  • Added a new example demonstrating how to use password protected zips.

Version 1.0 - September 8th, 2006

Initial release of library. Allows Blitz to open ZIP files and extract files from them. Also supports the creation of new ZIP files.