zip4j--Java操作zip压缩文件接口

/* * Copyright 2010 Srikanth Reddy Lingala * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package net.lingala.zip4j.core; import java.io.IOException; import java.io.RandomAccessFile; import java.util.ArrayList; import net.lingala.zip4j.exception.ZipException; import net.lingala.zip4j.exception.ZipExceptionConstants; import net.lingala.zip4j.model.AESExtraDataRecord; import net.lingala.zip4j.model.CentralDirectory; import net.lingala.zip4j.model.DigitalSignature; import net.lingala.zip4j.model.EndCentralDirRecord; import net.lingala.zip4j.model.ExtraDataRecord; import net.lingala.zip4j.model.FileHeader; import net.lingala.zip4j.model.LocalFileHeader; import net.lingala.zip4j.model.Zip64EndCentralDirLocator; import net.lingala.zip4j.model.Zip64EndCentralDirRecord; import net.lingala.zip4j.model.Zip64ExtendedInfo; import net.lingala.zip4j.model.ZipModel; import net.lingala.zip4j.util.InternalZipConstants; import net.lingala.zip4j.util.Raw; import net.lingala.zip4j.util.Zip4jConstants; import net.lingala.zip4j.util.Zip4jUtil; /** * Helper class to read header information for the zip file * */ public class HeaderReader { private RandomAccessFile zip4jRaf = null; private ZipModel zipModel; /** * Creates a new HeaderReader object with the given input stream * @param zip4jRaf */ public HeaderReader(RandomAccessFile zip4jRaf) { this.zip4jRaf = zip4jRaf; } /** * Reads all the header information for the zip file. * <br><br><b>Note:</b> This method does not read local file header information * @return {@link ZipModel} * @throws ZipException */ public ZipModel readAllHeaders() throws ZipException { return readAllHeaders(null); } /** * Reads all the header information for the zip file. File names are read with * input charset name. If this parameter is null, default system charset is used. * <br><br><b>Note:</b> This method does not read local file header information * @return {@link ZipModel} * @throws ZipException */ public ZipModel readAllHeaders(String fileNameCharset) throws ZipException { zipModel = new ZipModel(); zipModel.setFileNameCharset(fileNameCharset); zipModel.setEndCentralDirRecord(readEndOfCentralDirectoryRecord()); // If file is Zip64 format, then Zip64 headers have to be read before // reading central directory zipModel.setZip64EndCentralDirLocator(readZip64EndCentralDirLocator()); if (zipModel.isZip64Format()) { zipModel.setZip64EndCentralDirRecord(readZip64EndCentralDirRec()); if(zipModel.getZip64EndCentralDirRecord() != null && zipModel.getZip64EndCentralDirRecord().getNoOfThisDisk() > 0){ zipModel.setSplitArchive(true); } else { zipModel.setSplitArchive(false); } } zipModel.setCentralDirectory(readCentralDirectory()); //zipModel.setLocalFileHeaderList(readLocalFileHeaders()); //Donot read local headers now. return zipModel; } /** * Reads end of central directory record * @return {@link EndCentralDirRecord} * @throws ZipException */ private EndCentralDirRecord readEndOfCentralDirectoryRecord() throws ZipException { if (zip4jRaf == null) { throw new ZipException("random access file was null", ZipExceptionConstants.randomAccessFileNull); } try { byte[] ebs = new byte[4]; long pos = zip4jRaf.length() - InternalZipConstants.ENDHDR; EndCentralDirRecord endCentralDirRecord = new EndCentralDirRecord(); int counter = 0; do { zip4jRaf.seek(pos--); counter++; } while ((Raw.readLeInt(zip4jRaf, ebs) != InternalZipConstants.ENDSIG) && counter <= 3000); if ((Raw.readIntLittleEndian(ebs, 0) != InternalZipConstants.ENDSIG)) { throw new ZipException("zip headers not found. probably not a zip file"); } byte[] intBuff = new byte[4]; byte[] shortBuff = new byte[2]; //End of central record signature endCentralDirRecord.setSignature(InternalZipConstants.ENDSIG); //number of this disk readIntoBuff(zip4jRaf, shortBuff); endCentralDirRecord.setNoOfThisDisk(Raw.readShortLittleEndian(shortBuff, 0)); //number of the disk with the start of the central directory readIntoBuff(zip4jRaf, shortBuff); endCentralDirRecord.setNoOfThisDiskStartOfCentralDir(Raw.readShortLittleEndian(shortBuff, 0)); //total number of entries in the central directory on this disk readIntoBuff(zip4jRaf, shortBuff); endCentralDirRecord.setTotNoOfEntriesInCentralDirOnThisDisk(Raw.readShortLittleEndian(shortBuff, 0)); //total number of entries in the central directory readIntoBuff(zip4jRaf, shortBuff); endCentralDirRecord.setTotNoOfEntriesInCentralDir(Raw.readShortLittleEndian(shortBuff, 0)); //size of the central directory readIntoBuff(zip4jRaf, intBuff); endCentralDirRecord.setSizeOfCentralDir(Raw.readIntLittleEndian(intBuff, 0)); //offset of start of central directory with respect to the starting disk number readIntoBuff(zip4jRaf, intBuff); byte[] longBuff = getLongByteFromIntByte(intBuff); endCentralDirRecord.setOffsetOfStartOfCentralDir(Raw.readLongLittleEndian(longBuff, 0)); //.ZIP file comment length readIntoBuff(zip4jRaf, shortBuff); int commentLength = Raw.readShortLittleEndian(shortBuff, 0); endCentralDirRecord.setCommentLength(commentLength); //.ZIP file comment if (commentLength > 0) { byte[] commentBuf = new byte[commentLength]; readIntoBuff(zip4jRaf, commentBuf); endCentralDirRecord.setComment(new String(commentBuf)); endCentralDirRecord.setCommentBytes(commentBuf); } else { endCentralDirRecord.setComment(null); } int diskNumber = endCentralDirRecord.getNoOfThisDisk(); if (diskNumber > 0) { zipModel.setSplitArchive(true); } else { zipModel.setSplitArchive(false); } return endCentralDirRecord; } catch (IOException e) { throw new ZipException("Probably not a zip file or a corrupted zip file", e, ZipExceptionConstants.notZipFile); } } /** * Reads central directory information for the zip file * @return {@link CentralDirectory} * @throws ZipException */ private CentralDirectory readCentralDirectory() throws ZipException { if (zip4jRaf == null) { throw new ZipException("random access file was null", ZipExceptionConstants.randomAccessFileNull); } if (zipModel.getEndCentralDirRecord() == null) { throw new ZipException("EndCentralRecord was null, maybe a corrupt zip file"); } try { CentralDirectory centralDirectory = new CentralDirectory(); ArrayList fileHeaderList = new ArrayList(); EndCentralDirRecord endCentralDirRecord = zipModel.getEndCentralDirRecord(); long offSetStartCentralDir = endCentralDirRecord.getOffsetOfStartOfCentralDir(); int centralDirEntryCount = endCentralDirRecord.getTotNoOfEntriesInCentralDir(); if (zipModel.isZip64Format()) { offSetStartCentralDir = zipModel.getZip64EndCentralDirRecord().getOffsetStartCenDirWRTStartDiskNo(); centralDirEntryCount = (int)zipModel.getZip64EndCentralDirRecord().getTotNoOfEntriesInCentralDir(); } zip4jRaf.seek(offSetStartCentralDir); byte[] intBuff = new byte[4]; byte[] shortBuff = new byte[2]; byte[] longBuff = new byte[8]; for (int i = 0; i < centralDirEntry