def read_vint(reader: ByteReader, raw: bool = False):
header_byte = ord(reader.read(1))
if header_byte == 0:
raise WrongFile("VINT with zero header byte")
tail_length = 0
mask = 0x80
while header_byte & mask == 0:
tail_length += 1
mask >>= 1
header_number_part = header_byte & ~mask if not raw else header_byte
return parse_big_endian_number(
bytes([header_number_part]) + reader.read(tail_length))
def __init__(self, reader: ByteReader):
self.offset = reader.position
size = parse_big_endian_number(reader.read(4))
kind = reader.read(4)
if size == 1:
size = parse_big_endian_number(reader.read(8))
elif size == 0:
size = reader.end - reader.position
if kind == b"uuid":
kind += reader.read(16)
content_offset = reader.position
content_size = size - (content_offset - self.offset)
self.kind = kind
self.full_size = size
self.reader = RegionByteReader(reader, content_offset, content_size)
reader.skip(content_size)
def read_uint(reader: ByteReader, default: int = 0) -> int:
if reader.ended:
return default
return parse_big_endian_number(reader.read())