home / code / erlang-x-plane-data.git / blame
| Commit | Line | Data |
|---|---|---|
| cfe4f77b SK |
1 | -module(x_plane_data). |
| 2 | ||
| 3 | -include("x_plane_datum_defaults.hrl"). | |
| 4 | ||
| 5 | -export_type( | |
| 6 | [ t/0 | |
| 7 | ]). | |
| 8 | ||
| 9 | -export( | |
| 10 | [ of_bin/1 | |
| 11 | ]). | |
| 12 | ||
| 13 | -type parsing_error() :: | |
| 14 | packet_unrecognized | |
| 15 | | packet_length_invalid | |
| 16 | | x_plane_datum:parsing_error() | |
| 17 | . | |
| 18 | ||
| 19 | -type t() :: | |
| 20 | [x_plane_datum:t()]. | |
| 21 | ||
| 22 | -define(BYTE_SIZE_OF_EACH_BLOCK, 36). | |
| 23 | ||
| 24 | -spec of_bin(binary()) -> | |
| 25 | hope_result:t(t(), parsing_error()). | |
| 26 | of_bin(<<Packet/binary>>) -> | |
| 27 | of_bin(Packet, ?DEFAULT_MAX_INDEX). | |
| 28 | ||
| 29 | -spec of_bin(binary(), non_neg_integer()) -> | |
| 30 | hope_result:t(t(), parsing_error()). | |
| 31 | of_bin(<<"DATA", _PacketIndexByte:1/bytes, ContiguousBlocks/binary>>, MaxIndex) -> | |
| 0e7a4f60 | 32 | % Packet index byte seems to be changing from X-Plane version to version. |
| cfe4f77b SK |
33 | % What is it's meaning? |
| 34 | if byte_size(ContiguousBlocks) rem ?BYTE_SIZE_OF_EACH_BLOCK =:= 0 -> | |
| 35 | Blocks = blocks_split(ContiguousBlocks), | |
| 36 | ParseBlock = fun (B) -> x_plane_datum:of_bin(B, MaxIndex) end, | |
| 37 | hope_list:map_result(Blocks, ParseBlock) | |
| 38 | ; true -> | |
| 39 | {error, packet_length_invalid} | |
| 40 | end; | |
| 41 | of_bin(<<_/binary>>, _) -> | |
| 42 | {error, packet_unrecognized}. | |
| 43 | ||
| 44 | -spec blocks_split(binary()) -> | |
| 45 | [binary()]. | |
| 46 | blocks_split(<<>>) -> | |
| 47 | []; | |
| 48 | blocks_split(<<Block:?BYTE_SIZE_OF_EACH_BLOCK/bytes, Blocks/binary>>) -> | |
| 49 | [Block | blocks_split(Blocks)]. |