class Header(object):
def __init__(self, data):
self.is_compressed = data[0] == 'C'
self.version = ord(data[3])
self.file_size = unpack('<L', data[4:8])[0]
if self.is_compressed:
data = data[:8] + zlib.decompress(data[8:])
self.data = data
self.frame_size = Rect(islice(data, 8, None))
index = 8 + self.frame_size.tell()
self.frame_rate = unpack('<H', data[index:index + 2])[0] / 256.0
self.frame_count = unpack('<H', data[index + 2:index + 4])[0]
self.end = index + 4
@property
def decompressed_data(self):
return self.data
def tell(self):
"""ヘッダが占めるバイト数を返す"""
return self.end
