DirectBufferOutputStream fails with insufficient capacity exception

[terzerm]

Writing a byte array to DirectBufferOutputStream fails when attempting to make use of the full capacity of the buffer. The reason is a bug in the capacity check in

    public void write(final byte[] srcBytes, final int srcOffset, final int length)
    {
        final long resultingOffset = position + ((long)length);
        if (resultingOffset >= this.length)
        {
            throw new IllegalStateException("insufficient capacity in the buffer");
        }

        buffer.putBytes(offset + position, srcBytes, srcOffset, length);
        position += length;
    }

The second line should be

        if (resultingOffset > this.length)

The following unit test reproduces the problem:

    @Test
    public void shouldWriteByteArray() throws IOException
    {
        final byte[] data = new byte[2];
        final MutableDirectBuffer buffer = new UnsafeBuffer(data);
        final DirectBufferOutputStream outputStream = new DirectBufferOutputStream(buffer);

        final byte[] source = { 1, 2 };
        outputStream.write(source);

        assertArrayEquals(source, data);
    }