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| # Copyright DataStax, Inc. | |
| # | |
| # Licensed under the Apache License, Version 2.0 (the "License"); | |
| # you may not use this file except in compliance with the License. | |
| # You may obtain a copy of the License at | |
| # | |
| # http://www.apache.org/licenses/LICENSE-2.0 | |
| # | |
| # Unless required by applicable law or agreed to in writing, software | |
| # distributed under the License is distributed on an "AS IS" BASIS, | |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| # See the License for the specific language governing permissions and | |
| # limitations under the License. | |
| include 'cython_marshal.pyx' | |
| from cassandra.buffer cimport Buffer, from_ptr_and_size | |
| from libc.stdint cimport int32_t | |
| from cassandra.bytesio cimport BytesIOReader | |
| cdef inline int get_buf(BytesIOReader reader, Buffer *buf_out) except -1: | |
| """ | |
| Get a pointer into the buffer provided by BytesIOReader for the | |
| next data item in the stream of values. | |
| BEWARE: | |
| If the next item has a zero negative size, the pointer will be set to NULL. | |
| A negative size happens when the value is NULL in the database, whereas a | |
| zero size may happen either for legacy reasons, or for data types such as | |
| strings (which may be empty). | |
| """ | |
| cdef Py_ssize_t raw_val_size = read_int(reader) | |
| cdef char *ptr | |
| if raw_val_size <= 0: | |
| ptr = NULL | |
| else: | |
| ptr = reader.read(raw_val_size) | |
| from_ptr_and_size(ptr, raw_val_size, buf_out) | |
| return 0 | |
| cdef inline int32_t read_int(BytesIOReader reader) except ?0xDEAD: | |
| cdef Buffer buf | |
| buf.ptr = reader.read(4) | |
| buf.size = 4 | |
| return unpack_num[int32_t](&buf) | |