blackbeard334 / lzfse47j

Java bindings for the LZFSE C reference implementation

What is this?

Java bindings for the LZFSE C reference implementation.

How to use..

Add to your project

Include the following dependency in your pom.xml, and you're good to go.

<dependencies>
    <dependency>
        <groupId>io.github.blackbeard334</groupId>
        <artifactId>lzfse47j</artifactId>
        <version>0.1</version>
        <classifier>natives-linux</classifier> 
 <!--or <classifier>natives-windows</classifier> --> 
    </dependency> 
</dependencies>

Code example

class Bla {
    long decompressLzfse(final byte[] srcArray, final byte[] dstArray) {
        return LzfseUtil.decodeBuffer(srcArray, srcArray.length, dstArray, dstArray.length);
    }
}

Caveat

LZFSE headers do not contain the decompressed length of the compressed file(s), so you need to provide them.

What if I don't know the length of the decompressed file?

The LzfseUtil.decodeBuffer() method will decompress bytes until:

• EOF reached
• DST buffer is full

Then we suggest something like:

class Bla {
    byte[] decompressLzfseWithUnknownLength(final byte[] srcArray) {
        final byte[] dstArray = new byte[srcArray.length * 2];

        while (true) {
            final long l = LzfseUtil.decodeBuffer(srcArray, srcArray.length, dstArray, dstArray.length);

            // is the dst buffer full?
            if (l == dstArray.length) {
                // then double dst buffer size
                dstArray = new byte[dstArray.length * 2];
            } else {
                // else EOF reached
                break;
            }
        }

        // return the decompressed bytes range
        return Arrays.copyOfRange(dstArray, 0, l);
    }
}

Development

Requirements

• apt install cmake
• apt install build-essential || MSBuild (https://learn.microsoft.com/en-us/visualstudio/msbuild/walkthrough-using-msbuild?view=vs-2022#install-msbuild)
• apt install openjdk-11-jdk

Build

run mvn -clean verify pom.xml -Pnatives-linux || -Pnatives-windows