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org.xeustechnologies.jtar.TarEntry Maven / Gradle / Ivy
/**
* Copyright 2012 Kamran Zafar
*
* 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 org.xeustechnologies.jtar;
import java.io.File;
import java.util.Date;
/**
* @author Kamran Zafar
*
*/
public class TarEntry {
protected File file;
protected TarHeader header;
private TarEntry() {
this.file = null;
this.header = new TarHeader();
}
public TarEntry(File file, String entryName) {
this();
this.file = file;
this.extractTarHeader( entryName );
}
public TarEntry(byte[] headerBuf) {
this();
this.parseTarHeader( headerBuf );
}
public boolean equals(TarEntry it) {
return this.header.name.toString().equals( it.header.name.toString() );
}
public boolean isDescendent(TarEntry desc) {
return desc.header.name.toString().startsWith( this.header.name.toString() );
}
public TarHeader getHeader() {
return this.header;
}
public String getName() {
return this.header.name.toString();
}
public void setName(String name) {
this.header.name = new StringBuffer( name );
}
public int getUserId() {
return this.header.userId;
}
public void setUserId(int userId) {
this.header.userId = userId;
}
public int getGroupId() {
return this.header.groupId;
}
public void setGroupId(int groupId) {
this.header.groupId = groupId;
}
public String getUserName() {
return this.header.userName.toString();
}
public void setUserName(String userName) {
this.header.userName = new StringBuffer( userName );
}
public String getGroupName() {
return this.header.groupName.toString();
}
public void setGroupName(String groupName) {
this.header.groupName = new StringBuffer( groupName );
}
public void setIds(int userId, int groupId) {
this.setUserId( userId );
this.setGroupId( groupId );
}
public void setModTime(long time) {
this.header.modTime = time / 1000;
}
public void setModTime(Date time) {
this.header.modTime = time.getTime() / 1000;
}
public Date getModTime() {
return new Date( this.header.modTime * 1000 );
}
public File getFile() {
return this.file;
}
public long getSize() {
return this.header.size;
}
public void setSize(long size) {
this.header.size = size;
}
/**
* Checks if the org.xeustechnologies.jtar entry is a directory
*
* @return
*/
public boolean isDirectory() {
if (this.file != null)
return this.file.isDirectory();
if (this.header != null) {
if (this.header.linkFlag == TarHeader.LF_DIR)
return true;
if (this.header.name.toString().endsWith( "/" ))
return true;
}
return false;
}
/**
* Extract header from File
*
* @param entryName
*/
public void extractTarHeader(String entryName) {
String name = entryName;
name = name.replace( File.separatorChar, '/' );
if (name.startsWith( "/" ))
name = name.substring( 1 );
header.linkName = new StringBuffer( "" );
header.name = new StringBuffer( name );
if (file.isDirectory()) {
header.mode = 040755;
header.linkFlag = TarHeader.LF_DIR;
if (header.name.charAt( header.name.length() - 1 ) != '/') {
header.name.append( "/" );
}
header.size = 0;
} else {
header.size = file.length();
header.mode = 0100644;
header.linkFlag = TarHeader.LF_NORMAL;
}
header.modTime = file.lastModified() / 1000;
header.checkSum = 0;
header.devMajor = 0;
header.devMinor = 0;
}
/**
* Calculate checksum
*
* @param buf
* @return
*/
public long computeCheckSum(byte[] buf) {
long sum = 0;
for (int i = 0; i < buf.length; ++i) {
sum += 255 & buf[i];
}
return sum;
}
/**
* Writes the header to the byte buffer
*
* @param outbuf
*/
public void writeEntryHeader(byte[] outbuf) {
int offset = 0;
offset = TarHeader.getNameBytes( this.header.name, outbuf, offset, TarHeader.NAMELEN );
offset = Octal.getOctalBytes( this.header.mode, outbuf, offset, TarHeader.MODELEN );
offset = Octal.getOctalBytes( this.header.userId, outbuf, offset, TarHeader.UIDLEN );
offset = Octal.getOctalBytes( this.header.groupId, outbuf, offset, TarHeader.GIDLEN );
long size = this.header.size;
offset = Octal.getLongOctalBytes( size, outbuf, offset, TarHeader.SIZELEN );
offset = Octal.getLongOctalBytes( this.header.modTime, outbuf, offset, TarHeader.MODTIMELEN );
int csOffset = offset;
for (int c = 0; c < TarHeader.CHKSUMLEN; ++c)
outbuf[offset++] = (byte) ' ';
outbuf[offset++] = this.header.linkFlag;
offset = TarHeader.getNameBytes( this.header.linkName, outbuf, offset, TarHeader.NAMELEN );
offset = TarHeader.getNameBytes( this.header.magic, outbuf, offset, TarHeader.MAGICLEN );
offset = TarHeader.getNameBytes( this.header.userName, outbuf, offset, TarHeader.UNAMELEN );
offset = TarHeader.getNameBytes( this.header.groupName, outbuf, offset, TarHeader.GNAMELEN );
offset = Octal.getOctalBytes( this.header.devMajor, outbuf, offset, TarHeader.DEVLEN );
offset = Octal.getOctalBytes( this.header.devMinor, outbuf, offset, TarHeader.DEVLEN );
for (; offset < outbuf.length;)
outbuf[offset++] = 0;
long checkSum = this.computeCheckSum( outbuf );
Octal.getCheckSumOctalBytes( checkSum, outbuf, csOffset, TarHeader.CHKSUMLEN );
}
/**
* Parses the tar header to the byte buffer
*
* @param header
* @param bh
*/
public void parseTarHeader(byte[] bh) {
int offset = 0;
header.name = TarHeader.parseName( bh, offset, TarHeader.NAMELEN );
offset += TarHeader.NAMELEN;
header.mode = (int) Octal.parseOctal( bh, offset, TarHeader.MODELEN );
offset += TarHeader.MODELEN;
header.userId = (int) Octal.parseOctal( bh, offset, TarHeader.UIDLEN );
offset += TarHeader.UIDLEN;
header.groupId = (int) Octal.parseOctal( bh, offset, TarHeader.GIDLEN );
offset += TarHeader.GIDLEN;
header.size = Octal.parseOctal( bh, offset, TarHeader.SIZELEN );
offset += TarHeader.SIZELEN;
header.modTime = Octal.parseOctal( bh, offset, TarHeader.MODTIMELEN );
offset += TarHeader.MODTIMELEN;
header.checkSum = (int) Octal.parseOctal( bh, offset, TarHeader.CHKSUMLEN );
offset += TarHeader.CHKSUMLEN;
header.linkFlag = bh[offset++];
header.linkName = TarHeader.parseName( bh, offset, TarHeader.NAMELEN );
offset += TarHeader.NAMELEN;
header.magic = TarHeader.parseName( bh, offset, TarHeader.MAGICLEN );
offset += TarHeader.MAGICLEN;
header.userName = TarHeader.parseName( bh, offset, TarHeader.UNAMELEN );
offset += TarHeader.UNAMELEN;
header.groupName = TarHeader.parseName( bh, offset, TarHeader.GNAMELEN );
offset += TarHeader.GNAMELEN;
header.devMajor = (int) Octal.parseOctal( bh, offset, TarHeader.DEVLEN );
offset += TarHeader.DEVLEN;
header.devMinor = (int) Octal.parseOctal( bh, offset, TarHeader.DEVLEN );
}
}
