1 /* 2 * Check 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 package org.tukaani.xz.check; 11 12 import org.tukaani.xz.XZ; 13 import org.tukaani.xz.UnsupportedOptionsException; 14 15 public abstract class Check { 16 int size; 17 String name; 18 19 public abstract void update(byte[] buf, int off, int len); 20 public abstract byte[] finish(); 21 22 public void update(byte[] buf) { 23 update(buf, 0, buf.length); 24 } 25 26 public int getSize() { 27 return size; 28 } 29 30 public String getName() { 31 return name; 32 } 33 34 public static Check getInstance(int checkType) 35 throws UnsupportedOptionsException { 36 switch (checkType) { 37 case XZ.CHECK_NONE: 38 return new None(); 39 40 case XZ.CHECK_CRC32: 41 return new CRC32(); 42 43 case XZ.CHECK_CRC64: 44 return new CRC64(); 45 46 case XZ.CHECK_SHA256: 47 try { 48 return new SHA256(); 49 } catch (java.security.NoSuchAlgorithmException e) {} 50 51 break; 52 } 53 54 throw new UnsupportedOptionsException( 55 "Unsupported Check ID " + checkType); 56 } 57 } 58
