home / code / erlang-x-plane-data.git / blame
| Commit | Line | Data |
|---|---|---|
| 07ba60a5 SK |
1 | -module(x_plane_data_raw). |
| 2 | ||
| 3 | -export_type( | |
| 4 | [ t/0 | |
| 5 | , index/0 | |
| 6 | , group_index/0 | |
| 7 | , group_values/0 | |
| 8 | , group/0 | |
| 9 | , groups/0 | |
| 10 | ]). | |
| 11 | ||
| 12 | -export( | |
| 13 | [ of_bin/1 | |
| 14 | ]). | |
| 15 | ||
| 16 | -type parsing_error() :: | |
| 17 | packet_bad_header | |
| 18 | | packet_bad_length | |
| 19 | . | |
| 20 | ||
| 21 | -type group_index() :: | |
| 22 | non_neg_integer(). | |
| 23 | ||
| 24 | -type group_values() :: | |
| 25 | { float() | |
| 26 | , float() | |
| 27 | , float() | |
| 28 | , float() | |
| 29 | , float() | |
| 30 | , float() | |
| 31 | , float() | |
| 32 | , float() | |
| 33 | }. | |
| 34 | ||
| 35 | -type group() :: | |
| 36 | {group_index(), group_values()}. | |
| 37 | ||
| 38 | % Packet index byte. Essentially a schema version. | |
| 39 | -type index() :: | |
| 40 | integer(). | |
| 41 | ||
| 42 | -type groups() :: | |
| 43 | [group()]. | |
| 44 | ||
| 45 | -type t() :: | |
| 46 | {index(), groups()}. | |
| 47 | ||
| 48 | -define(BYTE_SIZE_OF_EACH_BLOCK, 36). | |
| 49 | -define(PACKET_HEADER, "DATA"). | |
| 50 | ||
| 51 | -spec of_bin(binary()) -> | |
| 52 | {ok, t()} | |
| 53 | | {error, parsing_error()} | |
| 54 | . | |
| 55 | of_bin(<<?PACKET_HEADER, _:8/integer, ContiguousBlocks/binary>>) | |
| 56 | when byte_size(ContiguousBlocks) rem ?BYTE_SIZE_OF_EACH_BLOCK =/= 0 -> | |
| 57 | {error, packet_bad_length}; | |
| 58 | of_bin(<<?PACKET_HEADER, Index:8/integer, ContiguousBlocks/binary>>) -> | |
| 59 | Groups = [group_of_bin(B) || B <- blocks_split(ContiguousBlocks)], | |
| 60 | {ok, {Index, Groups}}; | |
| 61 | of_bin(<<_/binary>>) -> | |
| 62 | {error, packet_bad_header}. | |
| 63 | ||
| 64 | -spec blocks_split(binary()) -> | |
| 65 | [binary()]. | |
| 66 | blocks_split(<<>>) -> | |
| 67 | []; | |
| 68 | blocks_split(<<Block:?BYTE_SIZE_OF_EACH_BLOCK/bytes, Blocks/binary>>) -> | |
| 69 | [Block | blocks_split(Blocks)]. | |
| 70 | ||
| 71 | -spec group_of_bin(binary()) -> | |
| 72 | group(). | |
| 73 | group_of_bin( | |
| 74 | << Index:32/little-integer | |
| 75 | , V1:32/little-float | |
| 76 | , V2:32/little-float | |
| 77 | , V3:32/little-float | |
| 78 | , V4:32/little-float | |
| 79 | , V5:32/little-float | |
| 80 | , V6:32/little-float | |
| 81 | , V7:32/little-float | |
| 82 | , V8:32/little-float | |
| 83 | >> | |
| 84 | ) -> | |
| 85 | Values = {V1, V2, V3, V4, V5, V6, V7, V8}, | |
| 86 | {Index, Values}. |