1 /* 2 * XZSeekEncDemo 3 * 4 * Author: Lasse Collin <lasse.collin (at) tukaani.org> 5 * 6 * This file has been put into the public domain. 7 * You can do whatever you want with this file. 8 */ 9 10 import java.io.*; 11 import org.tukaani.xz.*; 12 13 /** 14 * Compresses a single file from standard input to standard ouput into 15 * a random-accessible .xz file. 16 * <p> 17 * Arguments: [preset [block size]] 18 * <p> 19 * Preset is an LZMA2 preset level which is an integer in the range [0, 9]. 20 * The default is 6. 21 * <p> 22 * Block size specifies the amount of uncompressed data to store per 23 * XZ Block. The default is 1 MiB (1048576 bytes). Bigger means better 24 * compression ratio. Smaller means faster random access. 25 */ 26 class XZSeekEncDemo { 27 public static void main(String[] args) throws Exception { 28 LZMA2Options options = new LZMA2Options(); 29 30 if (args.length >= 1) 31 options.setPreset(Integer.parseInt(args[0])); 32 33 int blockSize = 1024 * 1024; 34 if (args.length >= 2) 35 blockSize = Integer.parseInt(args[1]); 36 37 options.setDictSize(Math.min(options.getDictSize(), 38 Math.max(LZMA2Options.DICT_SIZE_MIN, 39 blockSize))); 40 41 System.err.println("Encoder memory usage: " 42 + options.getEncoderMemoryUsage() + " KiB"); 43 System.err.println("Decoder memory usage: " 44 + options.getDecoderMemoryUsage() + " KiB"); 45 System.err.println("Block size: " + blockSize + " B"); 46 47 XZOutputStream out = new XZOutputStream(System.out, options); 48 49 byte[] buf = new byte[8192]; 50 int left = blockSize; 51 52 while (true) { 53 int size = System.in.read(buf, 0, Math.min(buf.length, left)); 54 if (size == -1) 55 break; 56 57 out.write(buf, 0, size); 58 left -= size; 59 60 if (left == 0) { 61 out.endBlock(); 62 left = blockSize; 63 } 64 } 65 66 out.finish(); 67 } 68 } 69
