text: # Licensed to the Apache Software Foundation (ASF) under one
  # or more contributor license agreements.  See the NOTICE file
  # distributed with this work for additional information
  # regarding copyright ownership.  The ASF licenses this file
  # to you 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.
  
  from __future__ import absolute_import
  
  import cffi
  
  c_source = """
      struct ArrowSchema {
        // Array type description
        const char* format;
        const char* name;
        const char* metadata;
        int64_t flags;
        int64_t n_children;
        struct ArrowSchema** children;
        struct ArrowSchema* dictionary;
  
        // Release callback
        void (*release)(struct ArrowSchema*);
        // Opaque producer-specific data
        void* private_data;
      };
  
      struct ArrowArray {
        // Array data description
        int64_t length;
        int64_t null_count;
        int64_t offset;
        int64_t n_buffers;
        int64_t n_children;
        const void** buffers;
        struct ArrowArray** children;
        struct ArrowArray* dictionary;
  
        // Release callback
        void (*release)(struct ArrowArray*);
        // Opaque producer-specific data
        void* private_data;
      };
  
      struct ArrowArrayStream {
        int (*get_schema)(struct ArrowArrayStream*, struct ArrowSchema* out);
        int (*get_next)(struct ArrowArrayStream*, struct ArrowArray* out);
  
        const char* (*get_last_error)(struct ArrowArrayStream*);
  
        // Release callback
        void (*release)(struct ArrowArrayStream*);
        // Opaque producer-specific data
        void* private_data;
      };
      """
  
  # TODO use out-of-line mode for faster import and avoid C parsing
  ffi = cffi.FFI()
  ffi.cdef(c_source)
  