34 lines
1.0 KiB
Cython
34 lines
1.0 KiB
Cython
include 'cython_marshal.pyx'
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from cassandra.buffer cimport Buffer, from_ptr_and_size
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from libc.stdint cimport int32_t
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from cassandra.bytesio cimport BytesIOReader
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cdef inline int get_buf(BytesIOReader reader, Buffer *buf_out) except -1:
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"""
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Get a pointer into the buffer provided by BytesIOReader for the
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next data item in the stream of values.
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BEWARE:
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If the next item has a zero negative size, the pointer will be set to NULL.
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A negative size happens when the value is NULL in the database, whereas a
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zero size may happen either for legacy reasons, or for data types such as
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strings (which may be empty).
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"""
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cdef Py_ssize_t raw_val_size = read_int(reader)
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cdef char *ptr
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if raw_val_size <= 0:
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ptr = NULL
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else:
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ptr = reader.read(raw_val_size)
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from_ptr_and_size(ptr, raw_val_size, buf_out)
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return 0
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cdef inline int32_t read_int(BytesIOReader reader) except ?0xDEAD:
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cdef Buffer buf
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buf.ptr = reader.read(4)
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buf.size = 4
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return int32_unpack(&buf)
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