| 17 | raise NotImplementedError() |
| 18 | |
| 19 | def read(self, size=None): |
| 20 | if size is not None and not isinstance(size, int): |
| 21 | raise TypeError("size parameter must be an int or long.") |
| 22 | |
| 23 | if size is not None: |
| 24 | if size == 0: |
| 25 | return b"" |
| 26 | if size < 0: |
| 27 | size = None |
| 28 | |
| 29 | self.buf.seek(0, os.SEEK_END) |
| 30 | |
| 31 | if size is None and self.buf.tell(): |
| 32 | ret = self.buf.getvalue() |
| 33 | self.buf = io.BytesIO() |
| 34 | return ret |
| 35 | if size is None: |
| 36 | d = self.chunk() |
| 37 | return d |
| 38 | |
| 39 | while self.buf.tell() < size: |
| 40 | chunk = self.chunk() |
| 41 | if not chunk: |
| 42 | ret = self.buf.getvalue() |
| 43 | self.buf = io.BytesIO() |
| 44 | return ret |
| 45 | self.buf.write(chunk) |
| 46 | data = self.buf.getvalue() |
| 47 | self.buf = io.BytesIO() |
| 48 | self.buf.write(data[size:]) |
| 49 | return data[:size] |
| 50 | |
| 51 | def unread(self, data): |
| 52 | rest = self.buf.getvalue() |