protected DbIndexOutput(DbDirectory directory,
    String name,
    boolean create) throws IOException 
{
        super();
        this.directory = directory;
        file = new File(directory, name, create);
        block = new Block(file);
        length = file.getLength();
        seek(length);
        block.get(directory);
        directory.openFiles.add(this);
}

 public  void close() throws IOException 
{
        flush();
        file.modify(directory, length, System.currentTimeMillis());
        directory.openFiles.remove(this);
}

 public  void flush() throws IOException 
{
        if (length  > 0)
            block.put(directory);
}

 public long getFilePointer() 
{
        return position;
}

 public long length() throws IOException 
{
        return length;
}

 public  void seek(long pos) throws IOException 
{
        if (pos  > length)
            throw new IOException("seeking past end of file");
        if ((pos  > > > BLOCK_SHIFT) == (position  > > > BLOCK_SHIFT))
            position = pos;
        else
        {
            block.put(directory);
            block.seek(pos);
            block.get(directory);
            position = pos;
        }
}

 public  void writeByte(byte b) throws IOException 
{
        int blockPos = (int) (position++ & BLOCK_MASK);
        block.getData()[blockPos] = b;
        if (blockPos + 1 == BLOCK_LEN)
        {
            block.put(directory);
            block.seek(position);
            block.get(directory);
        }
        if (position  > length)
            length = position;
}

 public  void writeBytes(byte[] b,
    int offset,
    int len) throws IOException 
{
        int blockPos = (int) (position & BLOCK_MASK);
        while (blockPos + len  >= BLOCK_LEN) {
            int blockLen = BLOCK_LEN - blockPos;
            System.arraycopy(b, offset, block.getData(), blockPos, blockLen);
            block.put(directory);
            len -= blockLen;
            offset += blockLen;
            position += blockLen;
            block.seek(position);
            block.get(directory);
            blockPos = 0;
        }
        if (len  > 0)
        {
            System.arraycopy(b, offset, block.getData(), blockPos, len);
            position += len;
        }
        if (position  > length)
            length = position;
}