2 /* maintains the internal dive list structure */
8 void add_event(struct dive *dive, int time, int type, int flags, int value, const char *name)
10 struct event *ev, **p;
11 unsigned int size, len = strlen(name);
13 size = sizeof(*ev) + len + 1;
18 memcpy(ev->name, name, len);
19 ev->time.seconds = time;
31 double get_depth_units(unsigned int mm, int *frac, const char **units)
37 switch (output_units.length) {
56 struct dive *alloc_dive(void)
58 const int initial_samples = 5;
62 size = dive_size(initial_samples);
66 memset(dive, 0, size);
67 dive->alloc_samples = initial_samples;
71 struct sample *prepare_sample(struct dive **divep)
73 struct dive *dive = *divep;
75 int nr = dive->samples;
76 int alloc_samples = dive->alloc_samples;
77 struct sample *sample;
78 if (nr >= alloc_samples) {
81 alloc_samples = (alloc_samples * 3)/2 + 10;
82 size = dive_size(alloc_samples);
83 dive = realloc(dive, size);
86 dive->alloc_samples = alloc_samples;
89 sample = dive->sample + nr;
90 memset(sample, 0, sizeof(*sample));
96 void finish_sample(struct dive *dive, struct sample *sample)
102 * So when we re-calculate maxdepth and meandepth, we will
103 * not override the old numbers if they are close to the
106 * Why? Because a dive computer may well actually track the
107 * max depth and mean depth at finer granularity than the
108 * samples it stores. So it's possible that the max and mean
109 * have been reported more correctly originally.
111 * Only if the values calculated from the samples are clearly
112 * different do we override the normal depth values.
114 * This considers 1m to be "clearly different". That's
115 * a totally random number.
117 static void update_depth(depth_t *depth, int new)
122 if (abs(old - new) > 1000)
127 static void update_duration(duration_t *duration, int new)
130 duration->seconds = new;
133 static void update_temperature(temperature_t *temperature, int new)
136 int old = temperature->mkelvin;
138 if (abs(old - new) > 1000)
139 temperature->mkelvin = new;
143 static void fixup_pressure(struct dive *dive, struct sample *sample)
145 unsigned int pressure, index;
148 pressure = sample->cylinderpressure.mbar;
151 index = sample->cylinderindex;
152 if (index >= MAX_CYLINDERS)
154 cyl = dive->cylinder + index;
155 if (!cyl->start.mbar)
156 cyl->start.mbar = pressure;
157 /* we need to handle the user entering beginning and end tank pressures
158 * - maybe even IF we have samples. But for now if we have air pressure
159 * data in the samples, we use that instead of the minimum
160 * if (!cyl->end.mbar || pressure < cyl->end.mbar)
162 cyl->end.mbar = pressure;
165 struct dive *fixup_dive(struct dive *dive)
168 double depthtime = 0;
170 int start = -1, end = -1;
171 int maxdepth = 0, mintemp = 0;
175 for (i = 0; i < dive->samples; i++) {
176 struct sample *sample = dive->sample + i;
177 int time = sample->time.seconds;
178 int depth = sample->depth.mm;
179 int temp = sample->temperature.mkelvin;
187 if (depth > maxdepth)
191 fixup_pressure(dive, sample);
195 * If we have consecutive identical
196 * temperature readings, throw away
197 * the redundant ones.
199 if (lasttemp == temp)
200 sample->temperature.mkelvin = 0;
204 if (!mintemp || temp < mintemp)
207 depthtime += (time - lasttime) * (lastdepth + depth) / 2;
214 update_duration(&dive->duration, end - start);
216 depthtime /= (end - start);
218 update_depth(&dive->meandepth, depthtime);
219 update_temperature(&dive->watertemp, mintemp);
220 update_depth(&dive->maxdepth, maxdepth);
225 /* Don't pick a zero for MERGE_MIN() */
226 #define MERGE_MAX(res, a, b, n) res->n = MAX(a->n, b->n)
227 #define MERGE_MIN(res, a, b, n) res->n = (a->n)?(b->n)?MIN(a->n, b->n):(a->n):(b->n)
228 #define MERGE_TXT(res, a, b, n) res->n = merge_text(a->n, b->n)
229 #define MERGE_NONZERO(res, a, b, n) res->n = a->n ? a->n : b->n
231 static struct dive *add_sample(struct sample *sample, int time, struct dive *dive)
233 struct sample *p = prepare_sample(&dive);
238 p->time.seconds = time;
239 finish_sample(dive, p);
244 * Merge samples. Dive 'a' is "offset" seconds before Dive 'b'
246 static struct dive *merge_samples(struct dive *res, struct dive *a, struct dive *b, int offset)
248 int asamples = a->samples;
249 int bsamples = b->samples;
250 struct sample *as = a->sample;
251 struct sample *bs = b->sample;
255 struct sample sample;
260 at = asamples ? as->time.seconds : -1;
261 bt = bsamples ? bs->time.seconds + offset : -1;
263 /* No samples? All done! */
264 if (at < 0 && bt < 0)
265 return fixup_dive(res);
267 /* Only samples from a? */
270 res = add_sample(as, at, res);
276 /* Only samples from b? */
279 res = add_sample(bs, bt, res);
290 /* same-time sample: add a merged sample. Take the non-zero ones */
293 sample.depth = as->depth;
294 if (as->temperature.mkelvin)
295 sample.temperature = as->temperature;
296 if (as->cylinderpressure.mbar)
297 sample.cylinderpressure = as->cylinderpressure;
298 if (as->cylinderindex)
299 sample.cylinderindex = as->cylinderindex;
301 res = add_sample(&sample, at, res);
310 static char *merge_text(const char *a, const char *b)
320 res = malloc(strlen(a) + strlen(b) + 9);
323 sprintf(res, "(%s) or (%s)", a, b);
327 #define SORT(a,b,field) \
328 if (a->field != b->field) return a->field < b->field ? -1 : 1
330 static int sort_event(struct event *a, struct event *b)
332 SORT(a,b,time.seconds);
336 return strcmp(a->name, b->name);
339 static void merge_events(struct dive *res, struct dive *src1, struct dive *src2, int offset)
342 struct event **p = &res->events;
347 b->time.seconds += offset;
362 s = sort_event(a, b);
370 /* Pick 'a' or neither */
380 /* Pick whichever has any info (if either). Prefer 'a' */
381 static void merge_cylinder_type(cylinder_type_t *res, cylinder_type_t *a, cylinder_type_t *b)
388 static void merge_cylinder_mix(struct gasmix *res, struct gasmix *a, struct gasmix *b)
395 static void merge_cylinder_info(cylinder_t *res, cylinder_t *a, cylinder_t *b)
397 merge_cylinder_type(&res->type, &a->type, &b->type);
398 merge_cylinder_mix(&res->gasmix, &a->gasmix, &b->gasmix);
399 MERGE_MAX(res, a, b, start.mbar);
400 MERGE_MIN(res, a, b, end.mbar);
404 * This could do a lot more merging. Right now it really only
405 * merges almost exact duplicates - something that happens easily
406 * with overlapping dive downloads.
408 struct dive *try_to_merge(struct dive *a, struct dive *b)
413 if (a->when != b->when)
419 MERGE_NONZERO(res, a, b, latitude);
420 MERGE_NONZERO(res, a, b, longitude);
421 MERGE_TXT(res, a, b, location);
422 MERGE_TXT(res, a, b, notes);
423 MERGE_TXT(res, a, b, buddy);
424 MERGE_TXT(res, a, b, divemaster);
425 MERGE_MAX(res, a, b, number);
426 MERGE_MAX(res, a, b, maxdepth.mm);
427 res->meandepth.mm = 0;
428 MERGE_MAX(res, a, b, duration.seconds);
429 MERGE_MAX(res, a, b, surfacetime.seconds);
430 MERGE_MAX(res, a, b, airtemp.mkelvin);
431 MERGE_MIN(res, a, b, watertemp.mkelvin);
432 for (i = 0; i < MAX_CYLINDERS; i++)
433 merge_cylinder_info(res->cylinder+i, a->cylinder + i, b->cylinder + i);
434 merge_events(res, a, b, 0);
435 return merge_samples(res, a, b, 0);