1 /* 2 * CRC32Hash 3 * 4 * Authors: Lasse Collin <lasse.collin (at) tukaani.org> 5 * Igor Pavlov <http://7-zip.org/> 6 * 7 * This file has been put into the public domain. 8 * You can do whatever you want with this file. 9 */ 10 11 package org.tukaani.xz.lz; 12 13 /** 14 * Provides a CRC32 table using the polynomial from IEEE 802.3. 15 */ 16 class CRC32Hash { 17 private static final int CRC32_POLY = 0xEDB88320; 18 19 static final int[] crcTable = new int[256]; 20 21 static { 22 for (int i = 0; i < 256; ++i) { 23 int r = i; 24 25 for (int j = 0; j < 8; ++j) { 26 if ((r & 1) != 0) 27 r = (r >>> 1) ^ CRC32_POLY; 28 else 29 r >>>= 1; 30 } 31 32 crcTable[i] = r; 33 } 34 } 35 } 36
