109 lines
3.8 KiB
Java
109 lines
3.8 KiB
Java
/*
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* Copyright (C) 2010 Ken Ellinwood
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package kellinwood.zipio;
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import java.io.IOException;
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import kellinwood.logging.LoggerInterface;
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import kellinwood.logging.LoggerManager;
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public class CentralEnd
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{
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public int signature = 0x06054b50; // end of central dir signature 4 bytes
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public short numberThisDisk = 0; // number of this disk 2 bytes
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public short centralStartDisk = 0; // number of the disk with the start of the central directory 2 bytes
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public short numCentralEntries; // total number of entries in the central directory on this disk 2 bytes
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public short totalCentralEntries; // total number of entries in the central directory 2 bytes
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public int centralDirectorySize; // size of the central directory 4 bytes
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public int centralStartOffset; // offset of start of central directory with respect to the starting disk number 4 bytes
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public String fileComment; // .ZIP file comment (variable size)
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private static LoggerInterface log;
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public static CentralEnd read(ZipInput input) throws IOException
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{
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int signature = input.readInt();
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if (signature != 0x06054b50) {
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// back up to the signature
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input.seek( input.getFilePointer() - 4);
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return null;
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}
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CentralEnd entry = new CentralEnd();
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entry.doRead( input);
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return entry;
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}
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public static LoggerInterface getLogger() {
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if (log == null) log = LoggerManager.getLogger( CentralEnd.class.getName());
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return log;
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}
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private void doRead( ZipInput input) throws IOException
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{
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boolean debug = getLogger().isDebugEnabled();
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numberThisDisk = input.readShort();
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if (debug) log.debug( String.format("This disk number: 0x%04x", numberThisDisk));
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centralStartDisk = input.readShort();
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if (debug) log.debug( String.format("Central dir start disk number: 0x%04x", centralStartDisk));
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numCentralEntries = input.readShort();
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if (debug) log.debug( String.format("Central entries on this disk: 0x%04x", numCentralEntries));
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totalCentralEntries = input.readShort();
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if (debug) log.debug( String.format("Total number of central entries: 0x%04x", totalCentralEntries));
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centralDirectorySize = input.readInt();
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if (debug) log.debug( String.format("Central directory size: 0x%08x", centralDirectorySize));
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centralStartOffset = input.readInt();
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if (debug) log.debug( String.format("Central directory offset: 0x%08x", centralStartOffset));
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short zipFileCommentLen = input.readShort();
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fileComment = input.readString(zipFileCommentLen);
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if (debug) log.debug( ".ZIP file comment: " + fileComment);
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}
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public void write( ZipOutput output) throws IOException
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{
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boolean debug = getLogger().isDebugEnabled();
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output.writeInt( signature);
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output.writeShort( numberThisDisk);
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output.writeShort( centralStartDisk);
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output.writeShort( numCentralEntries);
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output.writeShort( totalCentralEntries);
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output.writeInt( centralDirectorySize );
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output.writeInt( centralStartOffset );
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output.writeShort( (short)fileComment.length());
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output.writeString( fileComment);
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}
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}
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