Correctly parse the braindamaged tank size information from uemis

[ext/subsurface.git] / uemis.c

diff --git a/uemis.c b/uemis.c
index 980c1827c86847cd6d5ba85253b515a33fef63cf..8dfc5a373f384d28c581d0464f1b36b7e05821c0 100644 (file)
--- a/uemis.c
+++ b/uemis.c
@@ -186,9 +186,30 @@ static void parse_divelog_binary(char *base64, struct dive **divep) {
        uint8_t *data;
        struct sample *sample;
        struct dive *dive = *divep;
+       int template, gasoffset;
 
        datalen = uemis_convert_base64(base64, &data);
 
+       /* dive template in use:
+          0 = air
+          1 = nitrox (B)
+          2 = nitrox (B+D)
+          3 = nitrox (B+T+D)
+          uemis cylinder data is insane - it stores seven tank settings in a block
+          and the template tells us which of the four groups of tanks we need to look at
+        */
+       gasoffset = template = *(uint8_t *)(data+115);
+       if (template == 3)
+               gasoffset = 4;
+       for (i = 0; i < template; i++) {
+               float volume = *(float *)(data+116+25*(gasoffset + i)) * 1000.0;
+               /* uemis always assumes a working pressure of 3000psi / 206bar - even though that's wrong */
+               /* I also think that the unit that it stores (cuft for me) might change with SDA settings */
+               // dive->cylinder[i].type.size.mliter = volume * 206.84 / 28.317;
+               dive->cylinder[i].type.size.mliter = volume * 200 / 28.317;
+               dive->cylinder[i].gasmix.o2.permille = *(uint8_t *)(data+120+25*(gasoffset + i)) * 10 + 0.5;
+               dive->cylinder[i].gasmix.he.permille = 0;
+       }
        /* first byte of divelog data is at offset 0x123 */
        i = 0x123;
        while ((i < datalen) && (*(uint16_t *)(data+i))) {