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.

Binaries

Compressed binaries are available for Linux (64-bit), OSX (64-bit), and Windows (32-bit and 64-bit), from the releases page.
The Linux binary has been built using the manylinux1 (CentOS 5.11) Docker image, and is widely compatible.
Both Linux and OSX binaries have been built with rpath support.

License

MIT