Read data into *buf* with at most one system call.
(self, buf, read1)
| 1150 | # similar to the io implementation (which implements the methods for |
| 1151 | # performance reasons). |
| 1152 | def _readinto(self, buf, read1): |
| 1153 | """Read data into *buf* with at most one system call.""" |
| 1154 | |
| 1155 | self._checkClosed("readinto of closed file") |
| 1156 | |
| 1157 | # Need to create a memoryview object of type 'b', otherwise |
| 1158 | # we may not be able to assign bytes to it, and slicing it |
| 1159 | # would create a new object. |
| 1160 | if not isinstance(buf, memoryview): |
| 1161 | buf = memoryview(buf) |
| 1162 | if buf.nbytes == 0: |
| 1163 | return 0 |
| 1164 | buf = buf.cast('B') |
| 1165 | |
| 1166 | written = 0 |
| 1167 | with self._read_lock: |
| 1168 | while written < len(buf): |
| 1169 | |
| 1170 | # First try to read from internal buffer |
| 1171 | avail = min(len(self._read_buf) - self._read_pos, len(buf)) |
| 1172 | if avail: |
| 1173 | buf[written:written+avail] = \ |
| 1174 | self._read_buf[self._read_pos:self._read_pos+avail] |
| 1175 | self._read_pos += avail |
| 1176 | written += avail |
| 1177 | if written == len(buf): |
| 1178 | break |
| 1179 | |
| 1180 | # If remaining space in callers buffer is larger than |
| 1181 | # internal buffer, read directly into callers buffer |
| 1182 | if len(buf) - written > self.buffer_size: |
| 1183 | n = self.raw.readinto(buf[written:]) |
| 1184 | if not n: |
| 1185 | break # eof |
| 1186 | written += n |
| 1187 | |
| 1188 | # Otherwise refill internal buffer - unless we're |
| 1189 | # in read1 mode and already got some data |
| 1190 | elif not (read1 and written): |
| 1191 | if not self._peek_unlocked(1): |
| 1192 | break # eof |
| 1193 | |
| 1194 | # In readinto1 mode, return as soon as we have some data |
| 1195 | if read1 and written: |
| 1196 | break |
| 1197 | |
| 1198 | return written |
| 1199 | |
| 1200 | def tell(self): |
| 1201 | # GH-95782: Keep return value non-negative |
nothing calls this directly
no test coverage detected