DeflatePro

[a740g]

This is a QB64 _INFLATE$ compatible compression library. Internally it uses Google's Zopfli. Zopfli is a highly optimized C-based compression library designed to produce efficient (though slow) Deflate or zlib-compressed data. The advantage is that the compressed data is fully compatible with QB64’s _INFLATE$ function, allowing seamless decompression.

The library contains a single function:

Code: (Select All)

' @brief Compresses a STRING buffer using the Deflate algorithm with Zopfli. The output can be decompressed using QB64's _INFLATE$ function.

' @param inputBuffer The STRING buffer to compress.

' @param compressionLevel The compression level to use (0 - 65535). 65535 provides the highest compression, while 0 uses the library’s default. Levels above 255 may yield diminishing returns and are extremely slow.

' @return The compressed string.

FUNCTION DeflatePro$ (inputBuffer AS STRING, compressionLevel AS _UNSIGNED INTEGER)

The attached file has a test program in the zip root and the library inside the "include" directory. Use it however you see fit.




FAQ:
Q: Why did you do this?
A: Why not? Ok, just for fun.

[Petr]

Thanks for posting. I use _Deflate$ to compress image masks. I appreciate you posting it here. I tested it in version 4.0 (older versions see an unknown command there). I can use it for short strings, so the program stays snappy.

[a740g]

Thanks for posting. I use _Deflate$ to compress image masks. I appreciate you posting it here. I tested it in version 4.0 (older versions see an unknown command there). I can use it for short strings, so the program stays snappy.

You are welcome.  

The library does not use any v4-specific features. So you should be able to use that with previous versions of QB64-PE.