How to use LZMA SDK to compress/decompress in Java

Question

http://www.7-zip.org/sdk.html This site provide a LZMA SDK for compress/decompress files, I would like to give it a shot but I am lost.

Anyone got experience on this

Answer 1

https://mvnrepository.com/artifact/org.tukaani/xz/1.8

Kotlin code for Android:

 fun initDatabase() {
    var gisFile = this.getDatabasePath("china_gis.db");
    if (!gisFile.exists()) {
        if(!gisFile.parentFile.exists()) gisFile.parentFile.mkdirs();
        var inStream = assets.open("china_gis_no_poly.db.xz")
        inStream.use { input ->
            val buf = ByteArray(1024)
            XZInputStream(input).use { input ->
                FileOutputStream(gisFile,true).use { output ->
                    var size: Int
                    while (true) {
                        size = input.read(buf);
                        if (size != -1) {
                            output.write(buf, 0, size)
                        } else {
                            break;
                        }
                    }
                    output.flush()
                }

            }
        }
    }
}

Java code:

 byte[] buf = new byte[8192];
    String name =  "C:\\Users\\temp22\\Downloads\\2017-007-13\\china_gis_no_poly.db.xz";
    try {

      InputStream input = new FileInputStream(name);
                FileOutputStream output=  new FileOutputStream(name+".db");
                try {
                    // Since XZInputStream does some buffering internally
                    // anyway, BufferedInputStream doesn't seem to be
                    // needed here to improve performance.
                    // in = new BufferedInputStream(in);
                    input = new XZInputStream(input);

                    int size;
                    while ((size = input.read(buf)) != -1)
                        output.write(buf, 0, size);
                    output.flush();

                } finally {
                    // Close FileInputStream (directly or indirectly
                    // via XZInputStream, it doesn't matter).
                    input.close();
                    output.close();
                }

    } catch (FileNotFoundException e) {
        System.err.println("XZDecDemo: Cannot open " + name + ": "
                           + e.getMessage());
        System.exit(1);

    } catch (EOFException e) {
        System.err.println("XZDecDemo: Unexpected end of input on "
                           + name);
        System.exit(1);

    } catch (IOException e) {
        System.err.println("XZDecDemo: Error decompressing from "
                           + name + ": " + e.getMessage());
        System.exit(1);
    }