| 121 | self.length = length |
| 122 | |
| 123 | def read(self, size): |
| 124 | if not isinstance(size, int): |
| 125 | raise TypeError("size must be an integral type") |
| 126 | |
| 127 | size = min(self.length, size) |
| 128 | if size < 0: |
| 129 | raise ValueError("Size must be positive.") |
| 130 | if size == 0: |
| 131 | return b"" |
| 132 | |
| 133 | buf = io.BytesIO() |
| 134 | data = self.unreader.read() |
| 135 | while data: |
| 136 | buf.write(data) |
| 137 | if buf.tell() >= size: |
| 138 | break |
| 139 | data = self.unreader.read() |
| 140 | |
| 141 | buf = buf.getvalue() |
| 142 | ret, rest = buf[:size], buf[size:] |
| 143 | self.unreader.unread(rest) |
| 144 | self.length -= size |
| 145 | return ret |
| 146 | |
| 147 | |
| 148 | class EOFReader: |