Function create_buffer

arrow-array/src/ffi.rs:257–268

returns a new buffer corresponding to the index `i` of the FFI array. It may not exist (null pointer). `bits` is the number of bits that the native type of this buffer has. The size of the buffer will be `ceil(self.length * bits, 8)`. # Panic This function panics if `i` is larger or equal to `n_buffers`. # Safety This function assumes that `ceil(self.length * bits, 8)` is the size of the buffer

(
    owner: Arc<FFI_ArrowArray>,
    array: &FFI_ArrowArray,
    index: usize,
    len: usize,
)

/// # Safety
/// This function assumes that `ceil(self.length * bits, 8)` is the size of the buffer
unsafe fn create_buffer(
    owner: Arc<FFI_ArrowArray>,
    array: &FFI_ArrowArray,
    index: usize,
    len: usize,
) -> Option<Buffer> {
    if array.num_buffers() == 0 {
        return None;
    }
    NonNull::new(array.buffer(index) as _)
        .map(|ptr| unsafe { Buffer::from_custom_allocation(ptr, len, owner) })
}

/// Export to the C Data Interface
pub fn to_ffi(data: &ArrayData) -> Result<(FFI_ArrowArray, FFI_ArrowSchema)> {