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LICENSE.txt Executable file
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Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.kamranzafar</groupId>
<artifactId>jtar</artifactId>
<name>JTar</name>
<version>2.0</version>
<description>Java Tar API</description>
<parent>
<groupId>org.sonatype.oss</groupId>
<artifactId>oss-parent</artifactId>
<version>5</version>
</parent>
<developers>
<developer>
<id>xeus.man</id>
<name>Kamran Zafar</name>
<email>xeus.man@gmail.com
</email>
<roles>
<role>developer</role>
</roles>
</developer>
</developers>
<licenses>
<license>
<name>Apache Software License</name>
<url>${basedir}/LICENSE.txt
</url>
<distribution>repo</distribution>
</license>
</licenses>
<organization>
<name>Kamran Zafar</name>
<url>http://kamranzafar.org</url>
</organization>
<scm>
<connection>
scm:svn:https://jtar.googlecode.com/svn/trunk/jtar
</connection>
<developerConnection>
scm:svn:https://jtar.googlecode.com/svn/trunk/jtar
</developerConnection>
<url>https://jtar.googlecode.com/svn/trunk/jtar
</url>
</scm>
<build>
<sourceDirectory>${basedir}/src/main/java
</sourceDirectory>
<testSourceDirectory>${basedir}/src/test/java
</testSourceDirectory>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.5</source>
<target>1.5</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<executions>
<execution>
<id>attach-sources</id>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<executions>
<execution>
<id>attach-javadocs</id>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-gpg-plugin</artifactId>
<executions>
<execution>
<id>sign-artifacts</id>
<phase>verify</phase>
<goals>
<goal>sign</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>

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src/main/java/org/kamranzafar/jtar/Octal.java Executable file
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/**
* 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.kamranzafar.jtar;
/**
* @author Kamran Zafar
*
*/
public class Octal {
/**
* Parse an octal string from a header buffer. This is used for the file
* permission mode value.
*
* @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 long value of the octal string.
*/
public static long parseOctal(byte[] header, int offset, int length) {
long result = 0;
boolean stillPadding = true;
int end = offset + length;
for (int i = offset; i < end; ++i) {
if (header[i] == 0)
break;
if (header[i] == (byte) ' ' || header[i] == '0') {
if (stillPadding)
continue;
if (header[i] == (byte) ' ')
break;
}
stillPadding = false;
result = ( result << 3 ) + ( header[i] - '0' );
}
return result;
}
/**
* Parse an octal integer from a header buffer.
*
* @param value
* @param buf
* 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 integer value of the octal bytes.
*/
public static int getOctalBytes(long value, byte[] buf, int offset, int length) {
int idx = length - 1;
buf[offset + idx] = 0;
--idx;
buf[offset + idx] = (byte) ' ';
--idx;
if (value == 0) {
buf[offset + idx] = (byte) '0';
--idx;
} else {
for (long val = value; idx >= 0 && val > 0; --idx) {
buf[offset + idx] = (byte) ( (byte) '0' + (byte) ( val & 7 ) );
val = val >> 3;
}
}
for (; idx >= 0; --idx) {
buf[offset + idx] = (byte) ' ';
}
return offset + length;
}
/**
* Parse the checksum octal integer from a header buffer.
*
* @param value
* @param buf
* 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 integer value of the entry's checksum.
*/
public static int getCheckSumOctalBytes(long value, byte[] buf, int offset, int length) {
getOctalBytes( value, buf, offset, length );
buf[offset + length - 1] = (byte) ' ';
buf[offset + length - 2] = 0;
return offset + length;
}
/**
* Parse an octal long integer from a header buffer.
*
* @param value
* @param buf
* 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 long value of the octal bytes.
*/
public static int getLongOctalBytes(long value, byte[] buf, int offset, int length) {
byte[] temp = new byte[length + 1];
getOctalBytes( value, temp, 0, length + 1 );
System.arraycopy( temp, 0, buf, offset, length );
return offset + length;
}
}

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src/main/java/org/kamranzafar/jtar/TarConstants.java Executable file
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/**
* 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.kamranzafar.jtar;
/**
* @author Kamran Zafar
*
*/
public class TarConstants {
public static final int EOF_BLOCK = 1024;
public static final int DATA_BLOCK = 512;
public static final int HEADER_BLOCK = 512;
}

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src/main/java/org/kamranzafar/jtar/TarEntry.java Executable file
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/**
* 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.kamranzafar.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.mode = 0100644;
header.linkFlag = TarHeader.LF_NORMAL;
}
header.size = file.length();
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);
}
}

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src/main/java/org/kamranzafar/jtar/TarHeader.java Executable file
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/**
* 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.kamranzafar.jtar;
/**
* 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", "" );
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;
for (i = 0; i < length && i < name.length(); ++i) {
buf[offset + i] = (byte) name.charAt( i );
}
for (; i < length; ++i) {
buf[offset + i] = 0;
}
return offset + length;
}
}

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/**
* 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.kamranzafar.jtar;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* @author Kamran Zafar
*
*/
public class TarInputStream extends FilterInputStream {
private static final int SKIP_BUFFER_SIZE = 2048;
private TarEntry currentEntry;
private long currentFileSize;
private long bytesRead;
private boolean defaultSkip = false;
public TarInputStream(InputStream in) {
super(in);
currentFileSize = 0;
bytesRead = 0;
}
@Override
public boolean markSupported() {
return false;
}
/**
* Not supported
*
*/
@Override
public synchronized void mark(int readlimit) {
}
/**
* Not supported
*
*/
@Override
public synchronized void reset() throws IOException {
throw new IOException("mark/reset not supported");
}
/**
* Read a byte
*
* @see java.io.FilterInputStream#read()
*/
@Override
public int read() throws IOException {
byte[] buf = new byte[1];
int res = this.read(buf, 0, 1);
if (res != -1) {
return buf[0];
}
return res;
}
/**
* Checks if the bytes being read exceed the entry size and adjusts the byte
* array length. Updates the byte counters
*
*
* @see java.io.FilterInputStream#read(byte[], int, int)
*/
@Override
public int read(byte[] b, int off, int len) throws IOException {
if (currentEntry != null) {
if (currentFileSize == currentEntry.getSize()) {
return -1;
} else if ((currentEntry.getSize() - currentFileSize) < len) {
len = (int) (currentEntry.getSize() - currentFileSize);
}
}
int br = super.read(b, off, len);
if (br != -1) {
if (currentEntry != null) {
currentFileSize += br;
}
bytesRead += br;
}
return br;
}
/**
* Returns the next entry in the tar file
*
* @return TarEntry
* @throws IOException
*/
public TarEntry getNextEntry() throws IOException {
closeCurrentEntry();
byte[] header = new byte[TarConstants.HEADER_BLOCK];
byte[] theader = new byte[TarConstants.HEADER_BLOCK];
int tr = 0;
// Read full header
while (tr < TarConstants.HEADER_BLOCK) {
int res = read(theader, 0, TarConstants.HEADER_BLOCK - tr);
if (res < 0) {
break;
}
System.arraycopy(theader, 0, header, tr, res);
tr += res;
}
// Check if record is null
boolean eof = true;
for (byte b : header) {
if (b != 0) {
eof = false;
break;
}
}
if (!eof) {
bytesRead += header.length;
currentEntry = new TarEntry(header);
}
return currentEntry;
}
/**
* Closes the current tar entry
*
* @throws IOException
*/
protected void closeCurrentEntry() throws IOException {
if (currentEntry != null) {
if (currentEntry.getSize() > currentFileSize) {
// Not fully read, skip rest of the bytes
long bs = 0;
while (bs < currentEntry.getSize() - currentFileSize) {
long res = skip(currentEntry.getSize() - currentFileSize
- bs);
if (res == 0
&& currentEntry.getSize() - currentFileSize > 0) {
// I suspect file corruption
throw new IOException("Possible tar file corruption");
}
bs += res;
}
}
currentEntry = null;
currentFileSize = 0L;
skipPad();
}
}
/**
* Skips the pad at the end of each tar entry file content
*
* @throws IOException
*/
protected void skipPad() throws IOException {
if (bytesRead > 0) {
int extra = (int) (bytesRead % TarConstants.DATA_BLOCK);
if (extra > 0) {
long bs = 0;
while (bs < TarConstants.DATA_BLOCK - extra) {
long res = skip(TarConstants.DATA_BLOCK - extra - bs);
bs += res;
}
}
}
}
/**
* Skips 'n' bytes on the InputStream<br>
* Overrides default implementation of skip
*
*/
@Override
public long skip(long n) throws IOException {
if (defaultSkip) {
// use skip method of parent stream
// may not work if skip not implemented by parent
return super.skip(n);
}
if (n <= 0) {
return 0;
}
long left = n;
byte[] sBuff = new byte[SKIP_BUFFER_SIZE];
while (left > 0) {
int res = read(sBuff, 0, (int) (left < SKIP_BUFFER_SIZE ? left
: SKIP_BUFFER_SIZE));
if (res < 0) {
break;
}
left -= res;
}
return n - left;
}
public boolean isDefaultSkip() {
return defaultSkip;
}
public void setDefaultSkip(boolean defaultSkip) {
this.defaultSkip = defaultSkip;
}
}

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/**
* 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.kamranzafar.jtar;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* @author Kamran Zafar
*
*/
public class TarOutputStream extends FilterOutputStream {
private long bytesWritten;
private long currentFileSize;
private TarEntry currentEntry;
public TarOutputStream(OutputStream out) {
super( out );
bytesWritten = 0;
currentFileSize = 0;
}
/**
* Appends the EOF record and closes the stream
*
* @see java.io.FilterOutputStream#close()
*/
@Override
public void close() throws IOException {
closeCurrentEntry();
write( new byte[TarConstants.EOF_BLOCK] );
super.close();
}
/**
* Writes a byte to the stream and updates byte counters
*
* @see java.io.FilterOutputStream#write(int)
*/
@Override
public void write(int b) throws IOException {
super.write( b );
bytesWritten += 1;
if (currentEntry != null) {
currentFileSize += 1;
}
}
/**
* Checks if the bytes being written exceed the current entry size.
*
* @see java.io.FilterOutputStream#write(byte[], int, int)
*/
@Override
public void write(byte[] b, int off, int len) throws IOException {
if (currentEntry != null && !currentEntry.isDirectory()) {
if (currentEntry.getSize() < currentFileSize + len) {
throw new IOException( "The current entry[" + currentEntry.getName() + "] size["
+ currentEntry.getSize() + "] is smaller than the bytes[" + ( currentFileSize + len )
+ "] being written." );
}
}
super.write( b, off, len );
}
/**
* Writes the next tar entry header on the stream
*
* @param entry
* @throws IOException
*/
public void putNextEntry(TarEntry entry) throws IOException {
closeCurrentEntry();
byte[] header = new byte[TarConstants.HEADER_BLOCK];
entry.writeEntryHeader( header );
write( header );
currentEntry = entry;
}
/**
* Closes the current tar entry
*
* @throws IOException
*/
protected void closeCurrentEntry() throws IOException {
if (currentEntry != null) {
if (currentEntry.getSize() > currentFileSize) {
throw new IOException( "The current entry[" + currentEntry.getName() + "] of size["
+ currentEntry.getSize() + "] has not been fully written." );
}
currentEntry = null;
currentFileSize = 0;
pad();
}
}
/**
* Pads the last content block
*
* @throws IOException
*/
protected void pad() throws IOException {
if (bytesWritten > 0) {
int extra = (int) ( bytesWritten % TarConstants.DATA_BLOCK );
if (extra > 0) {
write( new byte[TarConstants.DATA_BLOCK - extra] );
}
}
}
}

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/**
* 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.kamranzafar.jtar;
import java.io.File;
/**
* @author Kamran
*
*/
public class TarUtils {
/**
* Determines the tar file size of the given folder/file path
*
* @param path
* @return
*/
public static long calculateTarSize(File path) {
return tarSize( path ) + TarConstants.EOF_BLOCK;
}
private static long tarSize(File dir) {
long size = 0;
if (dir.isFile()) {
return entrySize( dir.length() );
} else {
File[] subFiles = dir.listFiles();
if (subFiles != null && subFiles.length > 0) {
for (File file : subFiles) {
if (file.isFile()) {
size += entrySize( file.length() );
} else {
size += tarSize( file );
}
}
} else {
// Empty folder header
return TarConstants.HEADER_BLOCK;
}
}
return size;
}
private static long entrySize(long fileSize) {
long size = 0;
size += TarConstants.HEADER_BLOCK; // Header
size += fileSize; // File size
long extra = size % TarConstants.DATA_BLOCK;
if (extra > 0) {
size += ( TarConstants.DATA_BLOCK - extra ); // pad
}
return size;
}
}

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src/test/java/org/kamranzafar/jtar/JTarTest.java Executable file
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/**
* 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.kamranzafar.jtar;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import org.kamranzafar.jtar.TarEntry;
import org.kamranzafar.jtar.TarInputStream;
import org.kamranzafar.jtar.TarOutputStream;
import org.kamranzafar.jtar.TarUtils;
@RunWith(JUnit4.class)
public class JTarTest {
static final int BUFFER = 2048;
/**
* Tar the given folder
*
* @throws IOException
*/
@Test
public void tar() throws IOException {
FileOutputStream dest = new FileOutputStream("c:/tmp/tartest/test.tar");
TarOutputStream out = new TarOutputStream(
new BufferedOutputStream(dest));
tarFolder(null, "c:/tmp/untartest", out);
out.close();
System.out.println("Calculated tar size: "
+ TarUtils.calculateTarSize(new File("c:/tmp/untartest")));
System.out.println("Actual tar size: "
+ new File("c:/tmp/tartest/test.tar").length());
}
/**
* Untar the tar file
*
* @throws IOException
*/
@Test
public void untarTarFile() throws IOException {
String destFolder = "c:/tmp/untartest";
File zf = new File("c:/tmp/tartest/test.tar");
TarInputStream tis = new TarInputStream(new BufferedInputStream(
new FileInputStream(zf)));
untar(tis, destFolder);
tis.close();
}
/**
* Untar the gzipped-tar file
*
* @throws IOException
*/
@Test
public void untarTGzFile() throws IOException {
String destFolder = "c:/tmp/untartest";
File zf = new File("c:/tmp/test.tar.gz");
TarInputStream tis = new TarInputStream(new BufferedInputStream(
new GZIPInputStream(new FileInputStream(zf))));
untar(tis, destFolder);
tis.close();
}
private void untar(TarInputStream tis, String destFolder)
throws IOException {
BufferedOutputStream dest = null;
TarEntry entry;
while ((entry = tis.getNextEntry()) != null) {
System.out.println("Extracting: " + entry.getName());
int count;
byte data[] = new byte[BUFFER];
if (entry.isDirectory()) {
new File(destFolder + "/" + entry.getName()).mkdirs();
continue;
} else {
int di = entry.getName().lastIndexOf('/');
if (di != -1) {
new File(destFolder + "/"
+ entry.getName().substring(0, di)).mkdirs();
}
}
FileOutputStream fos = new FileOutputStream(destFolder + "/"
+ entry.getName());
dest = new BufferedOutputStream(fos);
while ((count = tis.read(data)) != -1) {
dest.write(data, 0, count);
}
dest.flush();
dest.close();
}
}
public void tarFolder(String parent, String path, TarOutputStream out)
throws IOException {
BufferedInputStream origin = null;
File f = new File(path);
String files[] = f.list();
// is file
if (files == null) {
files = new String[1];
files[0] = f.getName();
}
parent = ((parent == null) ? (f.isFile()) ? "" : f.getName() + "/"
: parent + f.getName() + "/");
for (int i = 0; i < files.length; i++) {
System.out.println("Adding: " + files[i]);
File fe = f;
byte data[] = new byte[BUFFER];
if (f.isDirectory()) {
fe = new File(f, files[i]);
}
if (fe.isDirectory()) {
String[] fl = fe.list();
if (fl != null && fl.length != 0) {
tarFolder(parent, fe.getPath(), out);
} else {
TarEntry entry = new TarEntry(fe, parent + files[i] + "/");
out.putNextEntry(entry);
out.write(new byte[(int) entry.getSize()]);
}
continue;
}
FileInputStream fi = new FileInputStream(fe);
origin = new BufferedInputStream(fi);
TarEntry entry = new TarEntry(fe, parent + files[i]);
out.putNextEntry(entry);
int count;
int bc = 0;
while ((count = origin.read(data)) != -1) {
out.write(data, 0, count);
bc += count;
}
out.flush();
origin.close();
}
}
}