CCR code: Change to sample structure

1) All the variables in the sample structures are strongly typed
2) Two additional types were declared in units.h:
     o2pressure_t
     bearing_t
3) The following variables were added:
     diluentpressure
     o2setpoint
     o2sensor[3]
4) Changes to a number of files were made to chanf
     sample->po2 to sample->po2.mbar
     bearing to bearring.degrees

Signed-off-by: Willem Ferguson <willemferguson@zoology.up.ac.za>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

11 files changed, 64 insertions, 51 deletions

diff --git a/dive.c b/dive.c
index 52a95ef80..fe2b408ea 100644
--- a/dive.c
+++ b/dive.c
@@ -1105,7 +1105,7 @@ static void merge_samples(struct divecomputer *res, struct divecomputer *a, stru
 			sample.sensor = as->sensor;
 		if (as->cns)
 			sample.cns = as->cns;
-		if (as->po2)
+		if (as->po2.mbar)
 			sample.po2 = as->po2;
 		if (as->ndl.seconds)
 			sample.ndl = as->ndl;
diff --git a/dive.h b/dive.h
index cdef2cd40..7a1c26d13 100644
--- a/dive.h
+++ b/dive.h
@@ -141,21 +141,25 @@ static inline depth_t gas_mod(struct gasmix *mix, pressure_t po2_limit) {
 void get_gas_string(const struct gasmix *gasmix, char *text, int len);
 const char *gasname(const struct gasmix *gasmix);
 
-struct sample {
-	duration_t time;
-	depth_t depth;
-	temperature_t temperature;
-	pressure_t cylinderpressure;
-	int sensor; /* Cylinder pressure sensor index */
-	duration_t ndl;
-	duration_t stoptime;
-	depth_t stopdepth;
-	bool in_deco;
-	int cns;
-	int po2;
-	int heartbeat;
-	int bearing;
-};
+struct sample                         // BASE TYPE BYTES  UNITS    RANGE      DESCRIPTION
+{                                     // --------- -----  -----    -----      -----------
+        duration_t time;               // uint32_t   4  seconds  (0-68 yrs)   elapsed dive time up to this sample
+        duration_t stoptime;           // uint32_t   4  seconds  (0-18 h)     time duration of next deco stop
+        duration_t ndl;                // uint32_t   4  seconds  (0-18 h)     time duration before no-deco limit
+        depth_t depth;                 // int32_t    4    mm     (0-2000 km)  dive depth of this sample
+        depth_t stopdepth;             // int32_t    4    mm     (0-2000 km)  depth of next deco stop
+        temperature_t temperature;     // int32_t    4  mdegrK   (0-2 MdegK)  ambient temperature
+        pressure_t cylinderpressure;   // int32_t    4    mbar   (0-2 Mbar)   main cylinder pressure
+        pressure_t diluentpressure;    // int32_t    4    mbar   (0-2 Mbar)   CCR diluent pressure (rebreather)
+        o2pressure_t po2;              // uint16_t    2    mbar  (0-65 bar)   O2 partial pressure
+        o2pressure_t o2setpoint;       // uint16_t    2    mbar  (0-65 bar)   CCR O2 setpoint (rebreather)
+        o2pressure_t o2sensor[3];      // uint16_t    6    mbar  (0-65 bar)   Up to 3 PO2 sensor values (rebreather)
+        bearing_t bearing;             // int16_t    2  degrees  (-32k to 32k deg) compass bearing
+        uint8_t sensor;                // uint8_t    1  sensorID (0-255)      ID of cylinder pressure sensor
+        uint8_t cns;                   // uint8_t    1     %     (0-255 %)    cns% accumulated
+        uint8_t heartbeat;             // uint8_t    1  beats/m  (0-255)      heart rate measurement
+        bool    in_deco;               // bool       1    y/n      y/n        this sample is part of deco
+};                      // Total size of structure: 48 bytes, excluding padding at end
 
 struct divetag {
 	/*
diff --git a/divelist.c b/divelist.c
index 489982465..c018bbdc7 100644
--- a/divelist.c
+++ b/divelist.c
@@ -178,8 +178,8 @@ static int calculate_otu(struct dive *dive)
 		struct sample *sample = dc->sample + i;
 		struct sample *psample = sample - 1;
 		t = sample->time.seconds - psample->time.seconds;
-		if (sample->po2) {
-			po2 = sample->po2;
+		if (sample->po2.mbar) {
+			po2 = sample->po2.mbar;
 		} else {
 			int o2 = active_o2(dive, dc, sample->time);
 			po2 = o2 * depth_to_atm(sample->depth.mm, dive);
@@ -242,8 +242,8 @@ static int calculate_cns(struct dive *dive)
 		struct sample *sample = dc->sample + i;
 		struct sample *psample = sample - 1;
 		t = sample->time.seconds - psample->time.seconds;
-		if (sample->po2) {
-			po2 = sample->po2;
+		if (sample->po2.mbar) {
+			po2 = sample->po2.mbar;
 		} else {
 			int o2 = active_o2(dive, dc, sample->time);
 			po2 = o2 / depth_to_atm(sample->depth.mm, dive);
@@ -326,7 +326,7 @@ static void add_dive_to_deco(struct dive *dive)
 		for (j = t0; j < t1; j++) {
 			int depth = interpolate(psample->depth.mm, sample->depth.mm, j - t0, t1 - t0);
 			(void)add_segment(depth_to_mbar(depth, dive) / 1000.0,
-					  &dive->cylinder[sample->sensor].gasmix, 1, sample->po2, dive);
+					  &dive->cylinder[sample->sensor].gasmix, 1, sample->po2.mbar, dive);
 		}
 	}
 }
diff --git a/libdivecomputer.c b/libdivecomputer.c
index d6f2d60b1..e8a033848 100644
--- a/libdivecomputer.c
+++ b/libdivecomputer.c
@@ -198,7 +198,7 @@ sample_cb(dc_sample_type_t type, dc_sample_value_t value, void *userdata)
 			sample->ndl.seconds = ndl;
 			sample->stoptime.seconds = stoptime;
 			sample->stopdepth.mm = stopdepth;
-			sample->po2 = po2;
+			sample->po2.mbar = po2;
 			sample->cns = cns;
 		}
 		sample = prepare_sample(dc);
@@ -225,7 +225,7 @@ sample_cb(dc_sample_type_t type, dc_sample_value_t value, void *userdata)
 		sample->heartbeat = value.heartbeat;
 		break;
 	case DC_SAMPLE_BEARING:
-		sample->bearing = value.bearing;
+		sample->bearing.degrees = value.bearing;
 		break;
 	case DC_SAMPLE_VENDOR:
 		printf("   <vendor time='%u:%02u' type=\"%u\" size=\"%u\">", FRACTION(sample->time.seconds, 60),
@@ -237,10 +237,10 @@ sample_cb(dc_sample_type_t type, dc_sample_value_t value, void *userdata)
 #if DC_VERSION_CHECK(0, 3, 0)
 	case DC_SAMPLE_SETPOINT:
 		/* for us a setpoint means constant pO2 from here */
-		sample->po2 = po2 = rint(value.setpoint * 1000);
+		sample->po2.mbar = po2 = rint(value.setpoint * 1000);
 		break;
 	case DC_SAMPLE_PPO2:
-		sample->po2 = po2 = rint(value.ppo2 * 1000);
+		sample->po2.mbar = po2 = rint(value.ppo2 * 1000);
 		break;
 	case DC_SAMPLE_CNS:
 		sample->cns = cns = rint(value.cns * 100);
diff --git a/load-git.c b/load-git.c
index acfdd2527..f50b067cf 100644
--- a/load-git.c
+++ b/load-git.c
@@ -375,8 +375,7 @@ static void parse_sample_keyvalue(void *_sample, const char *key, const char *va
 	}
 	if (!strcmp(key, "po2")) {
 		pressure_t p = get_pressure(value);
-		// Ugh, typeless.
-		sample->po2 = p.mbar;
+		sample->po2.mbar = p.mbar;
 		return;
 	}
 	if (!strcmp(key, "heartbeat")) {
@@ -384,7 +383,7 @@ static void parse_sample_keyvalue(void *_sample, const char *key, const char *va
 		return;
 	}
 	if (!strcmp(key, "bearing")) {
-		sample->bearing = atoi(value);
+		sample->bearing.degrees = atoi(value);
 		return;
 	}
 	report_error("Unexpected sample key/value pair (%s/%s)", key, value);
diff --git a/parse-xml.c b/parse-xml.c
index cef5221db..d1985657d 100644
--- a/parse-xml.c
+++ b/parse-xml.c
@@ -1327,7 +1327,7 @@ static void sample_start(void)
 	cur_sample->stoptime.seconds = laststoptime;
 	cur_sample->stopdepth.mm = laststopdepth;
 	cur_sample->cns = lastcns;
-	cur_sample->po2 = lastpo2;
+	cur_sample->po2.mbar = lastpo2;
 	cur_sample->sensor = lastsensor;
 }
 
@@ -1342,7 +1342,7 @@ static void sample_end(void)
 	laststoptime = cur_sample->stoptime.seconds;
 	laststopdepth = cur_sample->stopdepth.mm;
 	lastcns = cur_sample->cns;
-	lastpo2 = cur_sample->po2;
+	lastpo2 = cur_sample->po2.mbar;
 	cur_sample = NULL;
 }
 
@@ -1929,7 +1929,7 @@ extern int shearwater_profile_sample(void *handle, int columns, char **data, cha
 	if (data[2])
 		cur_sample->temperature.mkelvin = metric ? C_to_mkelvin(atof(data[2])) : F_to_mkelvin(atof(data[2]));
 	if (data[3])
-		cur_sample->po2 = atof(data[3]) * 1000;
+		cur_sample->po2.mbar = atof(data[3]) * 1000;
 	if (data[4])
 		cur_sample->ndl.seconds = atoi(data[4]) * 60;
 	if (data[5])
diff --git a/planner.c b/planner.c
index 445d375c5..32411b950 100644
--- a/planner.c
+++ b/planner.c
@@ -159,7 +159,7 @@ double tissue_at_end(struct dive *dive, char **cached_datap)
 		}
 		if (i > 0)
 			lastdepth = psample->depth.mm;
-		tissue_tolerance = interpolate_transition(dive, t0, t1, lastdepth, sample->depth.mm, &dive->cylinder[gasidx].gasmix, sample->po2);
+		tissue_tolerance = interpolate_transition(dive, t0, t1, lastdepth, sample->depth.mm, &dive->cylinder[gasidx].gasmix, sample->po2.mbar);
 		psample = sample;
 		t0 = t1;
 	}
@@ -263,7 +263,7 @@ static struct dive *create_dive_from_plan(struct diveplan *diveplan, struct dive
 	cyl = &master_dive->cylinder[0];
 	oldgasmix = cyl->gasmix;
 	sample = prepare_sample(dc);
-	sample->po2 = dp->po2;
+	sample->po2.mbar = dp->po2;
 	finish_sample(dc);
 	while (dp) {
 		struct gasmix gasmix = dp->gasmix;
@@ -300,7 +300,7 @@ static struct dive *create_dive_from_plan(struct diveplan *diveplan, struct dive
 			/* need to insert a first sample for the new gas */
 			add_gas_switch_event(dive, dc, lasttime + 1, idx);
 			sample = prepare_sample(dc);
-			sample[-1].po2 = po2;
+			sample[-1].po2.mbar = po2;
 			sample->time.seconds = lasttime + 1;
 			sample->depth.mm = lastdepth;
 			finish_sample(dc);
@@ -311,8 +311,8 @@ static struct dive *create_dive_from_plan(struct diveplan *diveplan, struct dive
 		sample = prepare_sample(dc);
 		/* set po2 at beginning of this segment */
 		/* and keep it valid for last sample - where it likely doesn't matter */
-		sample[-1].po2 = po2;
-		sample->po2 = po2;
+		sample[-1].po2.mbar = po2;
+		sample->po2.mbar = po2;
 		sample->time.seconds = lasttime = time;
 		sample->depth.mm = lastdepth = depth;
 		update_cylinder_pressure(dive, sample[-1].depth.mm, depth, time - sample[-1].time.seconds,
@@ -703,7 +703,7 @@ void plan(struct diveplan *diveplan, char **cached_datap, struct dive **divep, s
 	/* we start with gas 0, then check if that was changed */
 	gas = dive->cylinder[0].gasmix;
 	get_gas_from_events(&dive->dc, sample->time.seconds, &gas);
-	po2 = dive->dc.sample[dive->dc.samples - 1].po2;
+	po2 = dive->dc.sample[dive->dc.samples - 1].po2.mbar;
 	if ((current_cylinder = get_gasidx(dive, &gas)) == -1) {
 		report_error(translate("gettextFromC", "Can't find gas %s"), gasname(&gas));
 		current_cylinder = 0;
diff --git a/profile.c b/profile.c
index d3934e308..67948f22b 100644
--- a/profile.c
+++ b/profile.c
@@ -834,7 +834,7 @@ struct plot_data *populate_plot_entries(struct dive *dive, struct divecomputer *
 		pi->has_ndl |= sample->ndl.seconds;
 		entry->in_deco = sample->in_deco;
 		entry->cns = sample->cns;
-		entry->po2 = sample->po2 / 1000.0;
+		entry->po2 = sample->po2.mbar / 1000.0;
 		/* FIXME! sensor index -> cylinder index translation! */
 		entry->cylinderindex = sample->sensor;
 		SENSOR_PRESSURE(entry) = sample->cylinderpressure.mbar;
@@ -843,7 +843,7 @@ struct plot_data *populate_plot_entries(struct dive *dive, struct divecomputer *
 		else
 			entry->temperature = lasttemp;
 		entry->heartbeat = sample->heartbeat;
-		entry->bearing = sample->bearing;
+		entry->bearing = sample->bearing.degrees;
 
 		/* skip events that happened at this time */
 		while (ev && ev->time.seconds == time)
diff --git a/save-git.c b/save-git.c
index 6abba601a..af682820d 100644
--- a/save-git.c
+++ b/save-git.c
@@ -262,12 +262,12 @@ static void save_sample(struct membuffer *b, struct sample *sample, struct sampl
 		old->cns = sample->cns;
 	}
 
-	if (sample->po2 != old->po2) {
-		put_milli(b, " po2=", sample->po2, "bar");
+	if (sample->po2.mbar != old->po2.mbar) {
+		put_milli(b, " po2=", sample->po2.mbar, "bar");
 		old->po2 = sample->po2;
 	}
 	show_index(b, sample->heartbeat, "heartbeat=", "");
-	show_index(b, sample->bearing, "bearing=", "°");
+	show_index(b, sample->bearing.degrees, "bearing=", "°");
 	put_format(b, "\n");
 }
 
diff --git a/save-xml.c b/save-xml.c
index 5f61af77f..d48d0ef08 100644
--- a/save-xml.c
+++ b/save-xml.c
@@ -279,12 +279,12 @@ static void save_sample(struct membuffer *b, struct sample *sample, struct sampl
 		old->cns = sample->cns;
 	}
 
-	if (sample->po2 != old->po2) {
-		put_milli(b, " po2='", sample->po2, " bar'");
+	if (sample->po2.mbar != old->po2.mbar) {
+		put_milli(b, " po2='", sample->po2.mbar, " bar'");
 		old->po2 = sample->po2;
 	}
 	show_index(b, sample->heartbeat, "heartbeat='", "'");
-	show_index(b, sample->bearing, "bearing='", "'");
+	show_index(b, sample->bearing.degrees, "bearing='", "'");
 	put_format(b, " />\n");
 }
 
diff --git a/units.h b/units.h
index 0a9e44b79..4b32d5237 100644
--- a/units.h
+++ b/units.h
@@ -59,22 +59,32 @@ typedef int64_t timestamp_t;
 
 typedef struct
 {
-	int seconds;
+	uint32_t seconds; // durations up to 68 yrs
 } duration_t;
 
 typedef struct
 {
-	int mm;
-} depth_t;
+	int32_t mm;
+} depth_t; // depth to 2000 km
 
 typedef struct
 {
-	int mbar;
+	int32_t mbar; // pressure up to 2000 bar
 } pressure_t;
 
 typedef struct
 {
-	int mkelvin;
+	uint16_t mbar;
+} o2pressure_t; // pressure up to 65 bar
+
+typedef struct
+{
+	int16_t degrees;
+} bearing_t; // compass bearing
+
+typedef struct
+{
+	int32_t mkelvin; // up to 1750 degrees K
 } temperature_t;
 
 typedef struct
@@ -242,4 +252,4 @@ struct units {
 }
 #endif
 
-#endif
\ No newline at end of file
+#endif