FFI Bindings for the rust-polyline Crate

decode_polyline_ffi

Convert a Polyline into an array of coordinates.
Callers must pass two arguments:

• a pointer to a NUL-terminated character array (char*)
• an unsigned 32-bit int for precision (5 for Google Polylines, 6 for OSRM and Valhalla Polylines) Returns an Array struct with two fields:
• len, an integer of type size_t, denoting the array length
• data, a void pointer to a nested double-precision float array: [[1.0, 2.0], [3.0, 4.0]].

drop_float_array

Free memory pointed to by Array, which Rust has allocated across the FFI boundary.
Callers must pass the same Array struct that was received from decode_polyline_ffi.

encode_coordinates_ffi

Convert coordinates into a Polyline Callers must pass a struct, with two members:

• len, the array length
• data, a void pointer to a nested double-precision float array: [[1.0, 2.0], [3.0, 4.0]]
  The return type is a pointer to a C character array (char*).

drop_cstring

Free memory pointed to by char*, which Rust has allocated across the FFI boundary.
Callers must pass the same char* they receive from encode_coordinates_ffi.

License

MIT