1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.apksig.internal.zip; 18 19 import java.nio.ByteBuffer; 20 import java.nio.ByteOrder; 21 22 /** 23 * ZIP End of Central Directory record. 24 */ 25 public class EocdRecord { 26 private static final int CD_RECORD_COUNT_ON_DISK_OFFSET = 8; 27 private static final int CD_RECORD_COUNT_TOTAL_OFFSET = 10; 28 private static final int CD_SIZE_OFFSET = 12; 29 private static final int CD_OFFSET_OFFSET = 16; 30 createWithModifiedCentralDirectoryInfo( ByteBuffer original, int centralDirectoryRecordCount, long centralDirectorySizeBytes, long centralDirectoryOffset)31 public static ByteBuffer createWithModifiedCentralDirectoryInfo( 32 ByteBuffer original, 33 int centralDirectoryRecordCount, 34 long centralDirectorySizeBytes, 35 long centralDirectoryOffset) { 36 ByteBuffer result = ByteBuffer.allocate(original.remaining()); 37 result.order(ByteOrder.LITTLE_ENDIAN); 38 result.put(original.slice()); 39 result.flip(); 40 ZipUtils.setUnsignedInt16( 41 result, CD_RECORD_COUNT_ON_DISK_OFFSET, centralDirectoryRecordCount); 42 ZipUtils.setUnsignedInt16( 43 result, CD_RECORD_COUNT_TOTAL_OFFSET, centralDirectoryRecordCount); 44 ZipUtils.setUnsignedInt32(result, CD_SIZE_OFFSET, centralDirectorySizeBytes); 45 ZipUtils.setUnsignedInt32(result, CD_OFFSET_OFFSET, centralDirectoryOffset); 46 return result; 47 } 48 } 49