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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)
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