def test_read():
buffer = Buffer()
buffer.add(b"spam")
assert buffer.read(2) == b"sp"
assert buffer.read(2) == b"am"
buffer.add(b"eggs")
assert buffer.read() == b"eggs"
with pytest.raises(BufferUnderrun):
buffer.read(1)
def load_chunk(self, chunk_x, chunk_z):
"""
Loads the chunk at the given co-ordinates from the region file.
The co-ordinates should range from 0 to 31. Returns a ``TagRoot``.
"""
buff = Buffer()
# Read extent header
self.fd.seek(4 * (32 * chunk_z + chunk_x))
buff.add(self.fd.read(4))
entry = buff.unpack('I')
chunk_offset, chunk_length = entry >> 8, entry & 0xFF
if chunk_offset == 0:
raise ValueError((chunk_x, chunk_z))
# Read chunk
self.fd.seek(4096 * chunk_offset)
buff.add(self.fd.read(4096 * chunk_length))
chunk = buff.read(buff.unpack('IB')[0])
chunk = zlib.decompress(chunk)
chunk = TagRoot.from_bytes(chunk)
return chunk
def test_add():
buffer = Buffer()
buffer.add(b"spam")
assert len(buffer) == 4
assert buffer.read() == b"spam"