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}. |