1 /* 2 * Copyright (c) 2023-2023 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 package com.ohos.hapsigntool.zip; 17 18 import com.ohos.hapsigntool.error.ZipException; 19 20 import java.util.Arrays; 21 22 /** 23 * ZipEntry and CentralDirectory data 24 * 25 * @since 2023/12/02 26 */ 27 public class ZipEntry { 28 private ZipEntryData zipEntryData; 29 30 private CentralDirectory fileEntryIncentralDirectory; 31 32 /** 33 * alignment one entry 34 * 35 * @param alignNum need align bytes length 36 * @return add bytes length 37 * @throws ZipException alignment exception 38 */ alignment(int alignNum)39 public int alignment(int alignNum) throws ZipException { 40 // if cd extra len bigger than entry extra len, make cd and entry extra length equals 41 int padding = calZeroPaddingLengthForEntryExtra(); 42 int remainder = (int) ((zipEntryData.getZipEntryHeader().getLength() 43 + fileEntryIncentralDirectory.getOffset()) % alignNum); 44 45 if (remainder == 0) { 46 return padding; 47 } 48 int add = alignNum - remainder; 49 int newExtraLength = zipEntryData.getZipEntryHeader().getExtraLength() + add; 50 if (newExtraLength > UnsignedDecimalUtil.MAX_UNSIGNED_SHORT_VALUE) { 51 throw new ZipException("can not align " + zipEntryData.getZipEntryHeader().getFileName()); 52 } 53 setEntryHeaderNewExtraLength(newExtraLength); 54 setCenterDirectoryNewExtraLength(newExtraLength); 55 56 return add; 57 } 58 calZeroPaddingLengthForEntryExtra()59 private int calZeroPaddingLengthForEntryExtra() throws ZipException { 60 int entryExtraLen = zipEntryData.getZipEntryHeader().getExtraLength(); 61 int cdExtraLen = fileEntryIncentralDirectory.getExtraLength(); 62 if (cdExtraLen > entryExtraLen) { 63 setEntryHeaderNewExtraLength(cdExtraLen); 64 return cdExtraLen - entryExtraLen; 65 } 66 if (cdExtraLen < entryExtraLen) { 67 setCenterDirectoryNewExtraLength(entryExtraLen); 68 return entryExtraLen - cdExtraLen; 69 } 70 return 0; 71 } 72 setCenterDirectoryNewExtraLength(int newLength)73 private void setCenterDirectoryNewExtraLength(int newLength) throws ZipException { 74 byte[] newCDExtra = getAlignmentNewExtra(newLength, fileEntryIncentralDirectory.getExtraData()); 75 fileEntryIncentralDirectory.setExtraData(newCDExtra); 76 fileEntryIncentralDirectory.setExtraLength(newLength); 77 fileEntryIncentralDirectory.setLength(CentralDirectory.CD_LENGTH 78 + fileEntryIncentralDirectory.getFileNameLength() 79 + fileEntryIncentralDirectory.getExtraLength() + fileEntryIncentralDirectory.getCommentLength()); 80 } 81 setEntryHeaderNewExtraLength(int newLength)82 private void setEntryHeaderNewExtraLength(int newLength) throws ZipException { 83 ZipEntryHeader zipEntryHeader = zipEntryData.getZipEntryHeader(); 84 byte[] newExtra = getAlignmentNewExtra(newLength, zipEntryHeader.getExtraData()); 85 zipEntryHeader.setExtraData(newExtra); 86 zipEntryHeader.setExtraLength(newLength); 87 zipEntryHeader.setLength(ZipEntryHeader.HEADER_LENGTH + zipEntryHeader.getExtraLength() 88 + zipEntryHeader.getFileNameLength()); 89 zipEntryData.setLength(zipEntryHeader.getLength() + zipEntryData.getFileSize() 90 + (zipEntryData.getDataDescriptor() == null ? 0 : DataDescriptor.DES_LENGTH)); 91 } 92 getAlignmentNewExtra(int newLength, byte[] old)93 private byte[] getAlignmentNewExtra(int newLength, byte[] old) throws ZipException { 94 if (old == null) { 95 return new byte[newLength]; 96 } 97 if (newLength < old.length) { 98 throw new ZipException("can not align " + zipEntryData.getZipEntryHeader().getFileName()); 99 } 100 return Arrays.copyOf(old, newLength); 101 } 102 getZipEntryData()103 public ZipEntryData getZipEntryData() { 104 return zipEntryData; 105 } 106 setZipEntryData(ZipEntryData zipEntryData)107 public void setZipEntryData(ZipEntryData zipEntryData) { 108 this.zipEntryData = zipEntryData; 109 } 110 getCentralDirectory()111 public CentralDirectory getCentralDirectory() { 112 return fileEntryIncentralDirectory; 113 } 114 setCentralDirectory(CentralDirectory centralDirectory)115 public void setCentralDirectory(CentralDirectory centralDirectory) { 116 this.fileEntryIncentralDirectory = centralDirectory; 117 } 118 }