Read up to n bytes with at most one read() system call.
(self, n)
| 983 | raise BadZipFile("Bad CRC-32 for file %r" % self.name) |
| 984 | |
| 985 | def read1(self, n): |
| 986 | """Read up to n bytes with at most one read() system call.""" |
| 987 | |
| 988 | if n is None or n < 0: |
| 989 | buf = self._readbuffer[self._offset:] |
| 990 | self._readbuffer = b'' |
| 991 | self._offset = 0 |
| 992 | while not self._eof: |
| 993 | data = self._read1(self.MAX_N) |
| 994 | if data: |
| 995 | buf += data |
| 996 | break |
| 997 | return buf |
| 998 | |
| 999 | end = n + self._offset |
| 1000 | if end < len(self._readbuffer): |
| 1001 | buf = self._readbuffer[self._offset:end] |
| 1002 | self._offset = end |
| 1003 | return buf |
| 1004 | |
| 1005 | n = end - len(self._readbuffer) |
| 1006 | buf = self._readbuffer[self._offset:] |
| 1007 | self._readbuffer = b'' |
| 1008 | self._offset = 0 |
| 1009 | if n > 0: |
| 1010 | while not self._eof: |
| 1011 | data = self._read1(n) |
| 1012 | if n < len(data): |
| 1013 | self._readbuffer = data |
| 1014 | self._offset = n |
| 1015 | buf += data[:n] |
| 1016 | break |
| 1017 | if data: |
| 1018 | buf += data |
| 1019 | break |
| 1020 | return buf |
| 1021 | |
| 1022 | def _read1(self, n): |
| 1023 | # Read up to n compressed bytes with at most one read() system call, |