#!/usr/sbin/nbdkit python
API_VERSION = 2

def open(readonly):
    return 1

def get_size(h):
    return 1024*1024

def pread(h, buf, offset, flags):
    buf[:] = bytearray(len(buf))

def typ(offset):
    if offset % 2:
        return 0 # data
    else:
        return 3 # zero + hole

def extents(h, count, offset, flags):
    e = [(i, 1, typ(i)) for i in range(offset, offset + count + 1)]
    return e