Bug 94333 [Import/Export] Problems with reading long file names in tar files
The code which performs a read() on a LongLink name in TarInputStream does not check if it has read the entire name. This causes errors when importing tar files with long names.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/TarInputStream.java
* @param entry skips to this entry in the file
	 * @throws TarException
	 * @throws IOException
	 */
	TarInputStream(InputStream in, TarEntry entry) throws TarException, IOException {
		super(in);
		skipToEntry(entry);
	}
	/**
	 *  The checksum of a tar file header is simply the sum of the bytes in
	 *  the header.
	 * 
	 * @param header
	 * @return checksum
	 */
	private long headerChecksum(byte[] header) {
		long sum = 0;
		for(int i = 0; i < 512; i++) {
			sum += header[i] & 0xff;
		}
		return sum;
	}
	/**
	 * Skips ahead to the position of the given entry in the file.
	 * 
	 * @param entry
	 * @returns false if the entry has already been passed
	 * @throws TarException
	 * @throws IOException
	 */