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from .binary import encode_bin, decode_bin
class BitStreamReader(object):
__slots__ = ["substream", "buffer", "total_size"]
def __init__(self, substream):
self.substream = substream
self.total_size = 0
self.buffer = ""
def close(self):
if self.total_size % 8 != 0:
raise ValueError("total size of read data must be a multiple of 8",
self.total_size)
def tell(self):
return self.substream.tell()
def seek(self, pos, whence = 0):
self.buffer = ""
self.total_size = 0
self.substream.seek(pos, whence)
def read(self, count):
if count < 0:
raise ValueError("count cannot be negative")
l = len(self.buffer)
if count == 0:
data = ""
elif count <= l:
data = self.buffer[:count]
self.buffer = self.buffer[count:]
else:
data = self.buffer
count -= l
bytes = count // 8
if count & 7:
bytes += 1
buf = encode_bin(self.substream.read(bytes))
data += buf[:count]
self.buffer = buf[count:]
self.total_size += len(data)
return data
class BitStreamWriter(object):
__slots__ = ["substream", "buffer", "pos"]
def __init__(self, substream):
self.substream = substream
self.buffer = []
self.pos = 0
def close(self):
self.flush()
def flush(self):
bytes = decode_bin("".join(self.buffer))
self.substream.write(bytes)
self.buffer = []
self.pos = 0
def tell(self):
return self.substream.tell() + self.pos // 8
def seek(self, pos, whence = 0):
self.flush()
self.substream.seek(pos, whence)
def write(self, data):
if not data:
return
if type(data) is not str:
raise TypeError("data must be a string, not %r" % (type(data),))
self.buffer.append(data)