1 /* 2 * LZMA2Encoder 3 * 4 * Author: Lasse Collin <lasse.collin@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 package org.tukaani.xz; 11 12 import org.tukaani.xz.lzma.LZMAEncoder; 13 14 class LZMA2Encoder extends LZMA2Coder implements FilterEncoder { 15 private final LZMA2Options options; 16 private final byte[] props = new byte[1]; 17 LZMA2Encoder(LZMA2Options options)18 LZMA2Encoder(LZMA2Options options) { 19 if (options.getPresetDict() != null) 20 throw new IllegalArgumentException( 21 "XZ doesn't support a preset dictionary for now"); 22 23 if (options.getMode() == LZMA2Options.MODE_UNCOMPRESSED) { 24 props[0] = (byte)0; 25 } else { 26 int d = Math.max(options.getDictSize(), 27 LZMA2Options.DICT_SIZE_MIN); 28 props[0] = (byte)(LZMAEncoder.getDistSlot(d - 1) - 23); 29 } 30 31 // Make a private copy so that the caller is free to change its copy. 32 this.options = (LZMA2Options)options.clone(); 33 } 34 getFilterID()35 public long getFilterID() { 36 return FILTER_ID; 37 } 38 getFilterProps()39 public byte[] getFilterProps() { 40 return props; 41 } 42 supportsFlushing()43 public boolean supportsFlushing() { 44 return true; 45 } 46 getOutputStream(FinishableOutputStream out)47 public FinishableOutputStream getOutputStream(FinishableOutputStream out) { 48 return options.getOutputStream(out); 49 } 50 } 51