/**
* 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.
*
*/
/**
* The original source has been modified by Paul Williams.
*/
package com.codename1.io.tar;
import com.codename1.io.FileSystemStorage;
/**
* Header
*
* <pre>
* Offset Size Field
* 0 100 File name
* 100 8 File mode
* 108 8 Owner's numeric user ID
* 116 8 Group's numeric user ID
* 124 12 File size in bytes
* 136 12 Last modification time in numeric Unix time format
* 148 8 Checksum for header block
* 156 1 Link indicator (file type)
* 157 100 Name of linked file
* </pre>
*
*
* File Types
*
* <pre>
* Value Meaning
* '0' Normal file
* (ASCII NUL) Normal file (now obsolete)
* '1' Hard link
* '2' Symbolic link
* '3' Character special
* '4' Block special
* '5' Directory
* '6' FIFO
* '7' Contigous
* </pre>
*
*
*
* Ustar header
*
* <pre>
* Offset Size Field
* 257 6 UStar indicator "ustar"
* 263 2 UStar version "00"
* 265 32 Owner user name
* 297 32 Owner group name
* 329 8 Device major number
* 337 8 Device minor number
* 345 155 Filename prefix
* </pre>
*/
public class TarHeader {
/*
* Header
*/
public static final int NAMELEN = 100;
public static final int MODELEN = 8;
public static final int UIDLEN = 8;
public static final int GIDLEN = 8;
public static final int SIZELEN = 12;
public static final int MODTIMELEN = 12;
public static final int CHKSUMLEN = 8;
public static final byte LF_OLDNORM = 0;
/*
* File Types
*/
public static final byte LF_NORMAL = (byte) '0';
public static final byte LF_LINK = (byte) '1';
public static final byte LF_SYMLINK = (byte) '2';
public static final byte LF_CHR = (byte) '3';
public static final byte LF_BLK = (byte) '4';
public static final byte LF_DIR = (byte) '5';
public static final byte LF_FIFO = (byte) '6';
public static final byte LF_CONTIG = (byte) '7';
/*
* Ustar header
*/
public static final int MAGICLEN = 8;
/**
* The magic tag representing a POSIX tar archive.
*/
public static final String TMAGIC = "ustar";
/**
* The magic tag representing a GNU tar archive.
*/
public static final String GNU_TMAGIC = "ustar ";
public static final int UNAMELEN = 32;
public static final int GNAMELEN = 32;
public static final int DEVLEN = 8;
// Header values
public StringBuffer name;
public int mode;
public int userId;
public int groupId;
public long size;
public long modTime;
public int checkSum;
public byte linkFlag;
public StringBuffer linkName;
public StringBuffer magic;
public StringBuffer userName;
public StringBuffer groupName;
public int devMajor;
public int devMinor;
public TarHeader() {
this.magic = new StringBuffer( TarHeader.TMAGIC );
this.name = new StringBuffer();
this.linkName = new StringBuffer();
//String user = System.getProperty( "user.name", "" );
String user = "";
if (user.length() > 31)
user = user.substring( 0, 31 );
this.userId = 0;
this.groupId = 0;
this.userName = new StringBuffer( user );
this.groupName = new StringBuffer( "" );
}
/**
* Parse an entry name from a header buffer.
*
* @param name
* @param header
* The header buffer from which to parse.
* @param offset
* The offset into the buffer from which to parse.
* @param length
* The number of header bytes to parse.
* @return The header's entry name.
*/
public static StringBuffer parseName(byte[] header, int offset, int length) {
StringBuffer result = new StringBuffer( length );
int end = offset + length;
for (int i = offset; i < end; ++i) {
if (header[i] == 0)
break;
result.append( (char) header[i] );
}
return result;
}
/**
* Determine the number of bytes in an entry name.
*
* @param name
* @param header
* The header buffer from which to parse.
* @param offset
* The offset into the buffer from which to parse.
* @param length
* The number of header bytes to parse.
* @return The number of bytes in a header's entry name.
*/
public static int getNameBytes(StringBuffer name, byte[] buf, int offset, int length) {
int i;
int nlen = name.length();
for (i = 0; i < length && i < nlen; ++i) {
buf[offset + i] = (byte) name.charAt( i );
}
for (; i < length; ++i) {
buf[offset + i] = 0;
}
return offset + length;
}
}