def uncompress(cls, input_stream, file_size, mem_size):
output_stream = BytesIO()
br = StreamReader(input_stream)
end = input_stream.tell() + file_size
data = br.bytes(2)
data_len = (4 if ((data[0] & 0x80) != 0) else 3) * (2 if (
(data[0] & 0x01) != 0) else 1)
data = br.bytes(data_len)
real_size = 0
for i in range(data_len):
real_size = (real_size << 8) + data[i]
assert real_size == mem_size
while input_stream.tell() < end:
copy_size = 0
copy_offset = 0
packing = br.u8()
if packing < 0x80:
data = br.bytes(1)
data_len = packing & 0x03
copy_size = ((packing >> 2) & 0x07) + 3
copy_offset = (((packing << 3) & 0x300) | data[0]) + 1
elif packing < 0xC0:
data = br.bytes(2)
data_len = (data[0] >> 6) & 0x03
copy_size = (packing & 0x3F) + 4
copy_offset = (((data[0] << 8) & 0x3F00) | data[1]) + 1
elif packing < 0xE0:
data = br.bytes(3)
data_len = packing & 0x03
copy_size = (((packing << 6) & 0x300) | data[2]) + 5
copy_offset = (((packing << 12) & 0x10000) | data[0] << 8
| data[1]) + 1
elif packing < 0xFC:
data_len = (((packing & 0x1F) + 1) << 2)
else:
data_len = packing & 0x03
if data_len > 0:
output_stream.write(input_stream.read(data_len))
if copy_size < copy_offset > 8:
cls.copy_a(output_stream, copy_offset, copy_size)
else:
cls.copy_b(output_stream, copy_offset, copy_size)
output_stream.seek(0, SEEK_SET)
return output_stream
def uncompress(cls,input_stream, file_size, mem_size):
output_stream = BytesIO()
br = StreamReader(input_stream)
end = input_stream.tell() + file_size
data = br.bytes(2)
data_len = (4 if ((data[0] & 0x80) != 0) else 3 ) * ( 2 if ((data[0] & 0x01) != 0) else 1 )
data = br.bytes(data_len)
real_size = 0
for i in range(data_len): real_size = (real_size << 8) + data[i]
assert real_size == mem_size
while input_stream.tell() < end:
copy_size = 0
copy_offset = 0
packing = br.u8()
if packing < 0x80:
data = br.bytes(1)
data_len = packing & 0x03
copy_size = ((packing >> 2) & 0x07) + 3
copy_offset = (((packing << 3) & 0x300) | data[0]) + 1
elif packing < 0xC0:
data = br.bytes(2)
data_len = (data[0] >> 6) & 0x03
copy_size = (packing & 0x3F) + 4
copy_offset = (((data[0] << 8) & 0x3F00) | data[1]) + 1
elif packing < 0xE0:
data = br.bytes(3)
data_len = packing & 0x03
copy_size = (((packing << 6) & 0x300) | data[2]) + 5
copy_offset = (((packing << 12) & 0x10000) | data[0] << 8 | data[1]) + 1
elif packing < 0xFC:
data_len = (((packing & 0x1F) + 1) << 2)
else:
data_len = packing & 0x03
if data_len > 0:
output_stream.write(input_stream.read(data_len))
if copy_size < copy_offset > 8:
cls.copy_a(output_stream, copy_offset, copy_size)
else:
cls.copy_b(output_stream, copy_offset, copy_size)
output_stream.seek(0, SEEK_SET)
return output_stream
