com.codename1.io.tar.TarOutputStream 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.
*
*/
/**
* The original source has been modified by Paul Williams.
*/
package com.codename1.io.tar;
import java.io.IOException;
import java.io.OutputStream;
import com.codename1.io.BufferedOutputStream;
/**
* @author Kamran Zafar
*
*/
public class TarOutputStream extends BufferedOutputStream {
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." );
} else {
currentFileSize += len;
}
}
bytesWritten += len;
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] );
}
}
}
}