Bug 115672 [Import/Export] Spaces in a tar file checksum confuse the tar importer
3.2M3 The spacebar character is special in tar header files, and should generally be ignored. Space characters at the beginning the checksum field can confuse the current tar code, causing otherwise valid tar files to fail.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/TarInputStream.java
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
	 */
	boolean skipToEntry(TarEntry entry) throws TarException, IOException {
		int bytestoskip = entry.filepos - bytesread;
		if(bytestoskip < 0) return false;
		while(bytestoskip > 0) {
			long ret = in.skip(bytestoskip);