Minecraft chunk file reader

read_chunk.py

from struct import unpack

tag_types = { 0 : 'End',
			  1 : 'Byte',
			  2 : 'Short',
			  3 : 'Int',
			  4 : 'Long',
			  5 : 'Float',
			  6 : 'Double',
			  7 : 'Byte array',
			  8 : 'String',
			  9 : 'List',
			  10 : 'Compound'}

# Read number and type of list items and print them
def read_list_payload(chunk):
	list_item_type = ord(chunk.read(1))
	list_length = unpack('>l', chunk.read(4))[0]

	print "%d items of type %s" % (list_length, tag_types[list_item_type])
	
def read_byte(chunk):
	return ord(chunk.read(1))

def read_short(chunk):
	return unpack('>h', chunk.read(2))[0]
	
def read_int(chunk):
	return unpack('>l', chunk.read(4))[0]
			
def read_long(chunk):
	return unpack('>q', chunk.read(8))[0]
			
def read_byte_array(chunk):
	length = read_int(chunk)
	print "Array length: %d" % length
	payload = chunk.read(length)
	return payload
	
def read_compound(chunk):
	payload = []
	tag = read_tag(chunk)
	payload.append(tag)
	tag_type = tag[0]
	while (tag_type > 0):
		tag = read_tag(chunk)
		payload.append(tag)
		tag_type = tag[0]
	
	print "Read %d elements in compound" % len(payload)

	return payload
	
def read_string(chunk):
	str_length = unpack('>h', chunk.read(2))[0]
	if (str_length > 0):
		str = chunk.read(str_length)
		#print "Name: %s" % name
	else:
		str = None
	return str
	
def read_tag(chunk):
	type = ord(chunk.read(1)) # Chunk starts with "10" byte
	print "Found tag type: %s" % (tag_types[type], )
	if (type > 0):
		name = read_string(chunk)
		if (name != None):
			print "Name: %s" % name
	else:
		name = ''
		
	payload = None
	# Read payload of each tag. "0" tag has no payload
	if (type == 1):
		payload = read_byte(chunk)
	elif (type == 2):
		payload = read_short(chunk)
	elif (type == 3):
		payload = read_int(chunk)
	elif (type == 4):
		payload = read_long(chunk)
	elif (type == 5): # no separate float for now
		payload = read_long(chunk)
	elif (type == 6): # no separate double for now
		payload = read_long(chunk)
	elif (type == 7):
		payload = read_byte_array(chunk)
	elif (type == 8):
		payload = read_string(chunk)
	elif (type == 9):
		payload = read_list_payload(chunk)
	elif (type == 10):
		payload = read_compound(chunk)
		
	return (type, name, payload)

chunk = open('c.-d.18', 'r')

output = read_tag(chunk)

Массив tag_types по большому счёту не нужен, я использовал его для вывода типов прочитанных тегов