mirror of
https://github.com/WerWolv/ImHex-Patterns.git
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76 lines
2.3 KiB
Rust
76 lines
2.3 KiB
Rust
// Wintec TES file
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//
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// Wintec produced small GPS-Loggers that created TES files. Each file
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// is a series of timestamps and coordinates. The format is exceedingly
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// simple. The same 16 byte struct is repeated from start to finish.
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//
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// This would be a valid line:
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// 01 00 31 F9 DE 60 A0 B1 9C 16 A0 AD 45 0E 88 00
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// ----- ----------- ----------- ----------- -----
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// flags timestamp latitude longitude altitude
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//
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// The line decodes to:
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// flag 0x01 -> split mark (start of a new file)
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// timestamp 2024-03-15 15:36:49
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// latitude 37.936784°
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// longitude 23.944746°
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// altitude 136m
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//
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// Made with help from a (since deleted) GPSBabel definition
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// https://github.com/GPSBabel/gpsbabel/blob/gpsbabel_1_8_0/wintec_tes.cc
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#include "std/mem.pat"
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#include "std/string.pat"
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using WBTTimestamp;
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// helper to format latitude and longitude in a human-readable form
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// values are stored in an s32, but are actually scaled 1e-7 degrees.
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fn decimalDegrees(s32 input) {
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return double(input)/10000000;
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};
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// same as above, but outputs a string for readability
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fn stringDegrees(s32 input) {
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return std::format("{:f}°", double(input)/10000000);
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};
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// create the standard iso8601 format from any timestamp
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fn iso8601(WBTTimestamp input) {
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return std::format("20{:02d}-{:02d}-{:02d}T{:02d}:{:02d}:{:02d}Z",input.year, input.month, input.day, input.hours, input.minutes, input.seconds);
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};
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// This 16 bit field is barely used. Only these two are known.
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bitfield WBTFlags {
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split: 1 [[comment("start of a new file")]];
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waypoint: 1 [[comment("waypoint button pressed")]];
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padding: 14;
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};
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// The files store the timestamp in a somewhat uncommon 32 bit format
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bitfield WBTTimestamp {
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seconds: 6;
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minutes: 6;
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hours: 5;
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day: 5;
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month: 4;
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year: 6;
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} [[format("iso8601")]];
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// This is what parses each line of the file. From the very beginning to the very end,
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// all data is made up of this 16 byte struct.
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struct WBTLine {
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WBTFlags flags;
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WBTTimestamp timestamp [[color("ff0000")]];
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s32 lat [[color("007FFF"), format("stringDegrees")]];
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s32 lon [[color("7F00FF"), format("stringDegrees")]];
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s16 alt [[color("0000FF")]];
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} [[hex::visualize("coordinates", decimalDegrees(lat), decimalDegrees(lon))]];
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// parsing that whole file start to finish:
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WBTLine lines[while(!std::mem::eof())] @ 0x00;
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