1 /* 2 * IndexBase 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.index; 11 12 import org.tukaani.xz.common.Util; 13 import org.tukaani.xz.XZIOException; 14 15 abstract class IndexBase { 16 private final XZIOException invalidIndexException; 17 long blocksSum = 0; 18 long uncompressedSum = 0; 19 long indexListSize = 0; 20 long recordCount = 0; 21 22 IndexBase(XZIOException invalidIndexException) { 23 this.invalidIndexException = invalidIndexException; 24 } 25 26 private long getUnpaddedIndexSize() { 27 // Index Indicator + Number of Records + List of Records + CRC32 28 return 1 + Util.getVLISize(recordCount) + indexListSize + 4; 29 } 30 31 public long getIndexSize() { 32 return (getUnpaddedIndexSize() + 3) & ~3; 33 } 34 35 public long getStreamSize() { 36 return Util.STREAM_HEADER_SIZE + blocksSum + getIndexSize() 37 + Util.STREAM_HEADER_SIZE; 38 } 39 40 int getIndexPaddingSize() { 41 return (int)((4 - getUnpaddedIndexSize()) & 3); 42 } 43 44 void add(long unpaddedSize, long uncompressedSize) throws XZIOException { 45 blocksSum += (unpaddedSize + 3) & ~3; 46 uncompressedSum += uncompressedSize; 47 indexListSize += Util.getVLISize(unpaddedSize) 48 + Util.getVLISize(uncompressedSize); 49 ++recordCount; 50 51 if (blocksSum < 0 || uncompressedSum < 0 52 || getIndexSize() > Util.BACKWARD_SIZE_MAX 53 || getStreamSize() < 0) 54 throw invalidIndexException; 55 } 56 } 57
