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Garmin: Handle file names in short format

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When downloading heart rate data from a chest strap the Descent MK2i
uses a more compact format, like C4ND0302.fit. If any such dives have
been downloaded then newer dives in long format won't be detected and
requires downloading all dives and picking the right ones.

Instead parse this short format and ensure that these dives end up in
the correct order.

Format information found here:
https://gist.github.com/waywardone/fa8cb01462790aa8a26fab97477b80e1

Signed-off-by: Michael Andreen <michael@andreen.dev>
This commit is contained in:
Michael Andreen 2022-04-24 23:20:04 +02:00
parent 77498afe5e
commit ea051578e6
1 changed files with 41 additions and 1 deletions
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42
src/garmin.c
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@ -141,13 +141,53 @@ struct file_list {
struct fit_file *array;
};
static int
char_to_int(char c)
{
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'a' && c <= 'z')
return c - 'a' + 10;
if (c >= 'A' && c <= 'Z')
return c - 'A' + 10;
return 0;
}
/* C4ND0302.fit -> 2022-04-23-13-03-02.fit */
static void
parse_short_name(const char *name, char *output)
{
sprintf(output, "%d-%02d-%02d-%02d-%02d-%02d.fit", char_to_int(name[0]) + 2010, // Year
char_to_int(name[1]), // Month
char_to_int(name[2]), // Day
char_to_int(name[3]), // Hour
char_to_int(name[4]) * 10 + char_to_int(name[5]), // Minute
char_to_int(name[6]) * 10 + char_to_int(name[7])); // Second
}
static int name_cmp(const void *_a, const void *_b)
{
const struct fit_file *a = _a;
const struct fit_file *b = _b;
const char *a_name = a->name;
const char *b_name = b->name;
char a_buffer[FIT_NAME_SIZE];
char b_buffer[FIT_NAME_SIZE];
if (strlen(a_name) == 12) {
parse_short_name(a_name, a_buffer);
a_name = a_buffer;
}
if (strlen(b_name) == 12) {
parse_short_name(b_name, b_buffer);
b_name = b_buffer;
}
// Sort reverse string ordering (newest first), so use 'b,a'
return strcmp(b->name, a->name);
return strcmp(b_name, a_name);
}
/*