A library to help statistically encode and decode data. It is refactored from field-proven code from the BRouter project.
Refactoring is aimed towards a clear API with 64-bit default width, less performance hacks, a more educational structure, full coverage of edge cases and as few traps and glitches as possible.
The very heart of this library are the classes Bit(In/Out)putStream. They implement the Data(In/Out)put interface and are able to switch back and forth between byte-aligned and bitwise operations. The bitwise operations use the "MSB first" bit ordering.
Huffman encoding and arithmetic encoding is included together with a concept for Codecs with fixed statistics and 2-pass encoding. These are fitted for write-once/read-many-times problems like the blockwise read-only random access database inside BRouter's RD5-Datafiles.
Arithmetic encoding was not included in BRouter, just added here for completeness, and is heavily inspired by: https://github.com/nayuki/Reference-arithmetic-coding
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Java 8 or higher
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Compile the library using Maven:
mvn install
Recommended use is to just copy the java-sources + unit-tests you are actually using into your project. While in beta, I will not upload the statcoding library to maven-central, and reserve the right to change the binary format created by the library in an incompatible way.
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Example Lidar data processing:
examples/lidar/ -
Example QR code certificate:
examples/qr_certificate/ -
Example simple image encoding:
examples/images/
2022.11.27 Version 0.0.1
2023.03.19 Version 0.9.0