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/** |
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$Id$ |
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Copyright (C) Authors contributing to this file. |
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This file is part of BASE - BioArray Software Environment. |
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Available at http://base.thep.lu.se/ |
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BASE is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License |
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as published by the Free Software Foundation; either version 3 |
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of the License, or (at your option) any later version. |
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|
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BASE is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with BASE. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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package net.sf.basedb.util.zip; |
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|
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import java.io.ByteArrayOutputStream; |
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import java.io.IOException; |
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|
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import net.sf.basedb.util.FileUtil; |
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|
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import com.ice.tar.TarEntry; |
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import com.ice.tar.TarInputStream; |
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import com.ice.tar.TarOutputStream; |
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|
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/** |
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Contains utility functions for TAR archives. Most importantly functions |
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for handling entries with too long file names to fit in the header section. |
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|
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@author nicklas |
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@version 2.5.1 |
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@base.modified $Date$ |
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*/ |
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public class TarUtil |
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{ |
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/** |
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TAR has a limit of 100 characters in file names. Names that are longer |
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store the actual filename in an entry with this name just before |
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the real file (which usually has a truncated name entry). |
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*/ |
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public static final String LONG_LINK_NAME = "././@LongLink"; |
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|
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/** |
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Maximum file name length. |
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@see #LONG_LINK_NAME |
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*/ |
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public static final int MAX_NAME_LENGTH = 100; |
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|
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/** |
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The TAR header flag that must be set for @LongLink entries. |
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*/ |
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private static byte LONG_LINK_FLAG = (byte)'L'; |
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|
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/** |
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Get the next entry from a TAR input stream. This method has support for |
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long filenames. After calling this method the actual file data can be |
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read from the stream. |
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@param tarStream The TAR stream to read from |
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@return The next entry or null if the end of stream has been reached |
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*/ |
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public static final TarEntry getNextEntry(TarInputStream tarStream) |
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throws IOException |
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{ |
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TarEntry entry = tarStream.getNextEntry(); |
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if (entry != null) |
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{ |
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if (LONG_LINK_NAME.equals(entry.getName())) |
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{ |
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ByteArrayOutputStream out = new ByteArrayOutputStream((int)entry.getSize()); |
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FileUtil.copy(tarStream, out); |
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byte[] temp = out.toByteArray(); |
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int usedBytes = temp[temp.length-1] == 0x00 ? temp.length-1 : temp.length; |
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String filename = new String(temp, 0, usedBytes); |
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entry = tarStream.getNextEntry(); |
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entry.setName(filename); |
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} |
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} |
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return entry; |
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} |
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|
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/** |
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Put the next entry to a TAR stream. This method has support for |
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long filenames and will automatically create all neccesary extra information |
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inside the TAR stream. After calling this method the actual file data |
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should be written to the stream. |
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|
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@param entry The next entry |
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@param tarStream The tar stream to write to |
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*/ |
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public static final void putNextEntry(TarEntry entry, TarOutputStream tarStream) |
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throws IOException |
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{ |
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String name = entry.getName(); |
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if (name.length() > MAX_NAME_LENGTH) |
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{ |
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TarEntry longLink = new TarEntry(LONG_LINK_NAME); |
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if (entry.getModTime() != null) longLink.setModTime(entry.getModTime()); |
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longLink.setSize(name.length()+1); |
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longLink.getHeader().linkFlag = LONG_LINK_FLAG; |
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tarStream.putNextEntry(longLink); |
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tarStream.write(name.getBytes()); |
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tarStream.write(0); |
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tarStream.closeEntry(); |
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entry.setName(name.substring(0, MAX_NAME_LENGTH)); |
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} |
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tarStream.putNextEntry(entry); |
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} |
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|
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} |