#include <libxml/parser.h>
#include <libxml/tree.h>
+/*
+ * Some silly typedefs to make our units very explicit.
+ *
+ * Also, the units are chosen so that values can be expressible as
+ * integers, so that we never have FP rounding issues. And they
+ * are small enough that converting to/from imperial units doesn't
+ * really matter.
+ *
+ * We also strive to make '0' a meaningless number saying "not
+ * initialized", since many values are things that may not have
+ * been reported (eg tank pressure or temperature from dive
+ * computers that don't support them). But sometimes -1 is an even
+ * more explicit way of saying "not there".
+ *
+ * Thus "millibar" for pressure, for example, or "millikelvin" for
+ * temperatures. Doing temperatures in celsius or fahrenheit would
+ * make for loss of precision when converting from one to the other,
+ * and using millikelvin is SI-like but also means that a temperature
+ * of '0' is clearly just a missing temperature or tank pressure.
+ *
+ * Also strive to use units that can not possibly be mistaken for a
+ * valid value in a "normal" system without conversion. If the max
+ * depth of a dive is '20000', you probably didn't convert from mm on
+ * output, or if the max depth gets reported as "0.2ft" it was either
+ * a really boring dive, or there was some missing input conversion,
+ * and a 60-ft dive got recorded as 60mm.
+ *
+ * Doing these as "structs containing value" means that we always
+ * have to explicitly write out those units in order to get at the
+ * actual value. So there is hopefully little fear of using a value
+ * in millikelvin as Fahrenheit by mistake.
+ *
+ * We don't actually use these all yet, so maybe they'll change, but
+ * I made a number of types as guidelines.
+ */
+typedef struct {
+ int seconds;
+} duration_t;
+
+typedef struct {
+ int mm;
+} depth_t;
+
+typedef struct {
+ int mbar;
+} pressure_t;
+
+typedef struct {
+ int mkelvin;
+} temperature_t;
+
+typedef struct {
+ int mliter;
+} volume_t;
+
+typedef struct {
+ int permille;
+} fraction_t;
+
+typedef struct {
+ int grams;
+} weight_t;
+
+typedef struct {
+ fraction_t o2;
+ fraction_t n2;
+ fraction_t he2;
+} gasmix_t;
+
+typedef struct {
+ volume_t size;
+ pressure_t pressure;
+} tank_type_t;
+
+struct sample {
+ duration_t time;
+ depth_t depth;
+ temperature_t temperature;
+ pressure_t tankpressure;
+ int tankindex;
+};
+
+struct dive {
+ time_t when;
+ depth_t maxdepth, meandepth;
+ duration_t duration, surfacetime;
+ depth_t visibility;
+ temperature_t airtemp, watertemp;
+ pressure_t beginning_pressure, end_pressure;
+ int samples;
+ struct sample sample[];
+};
+
+static void record_dive(struct dive *dive)
+{
+ static int nr;
+
+ printf("Recording dive %d with %d samples\n", ++nr, dive->samples);
+}
+
+static void nonmatch(const char *type, const char *fullname, const char *name, int size, const char *buffer)
+{
+ printf("Unable to match %s '(%.*s)%s' (%.*s)\n", type,
+ (int) (name - fullname), fullname, name,
+ size, buffer);
+}
+
+static const char *last_part(const char *name)
+{
+ const char *p = strrchr(name, '.');
+ return p ? p+1 : name;
+}
+
+/* We're in samples - try to convert the random xml value to something useful */
+static void try_to_fill_sample(struct sample *sample, const char *name, int size, const char *buffer)
+{
+ const char *last = last_part(name);
+ nonmatch("sample", name, last, size, buffer);
+}
+
+/* We're in the top-level dive xml. Try to convert whatever value to a dive value */
+static void try_to_fill_dive(struct dive *dive, const char *name, int size, const char *buffer)
+{
+ const char *last = last_part(name);
+ nonmatch("dive", name, last, size, buffer);
+}
+
+/*
+ * Dive info as it is being built up..
+ */
+static int alloc_samples;
+static struct dive *dive;
+static struct sample *sample;
+
+static unsigned int dive_size(int samples)
+{
+ return sizeof(struct dive) + samples*sizeof(struct sample);
+}
+
+/*
+ * File boundaries are dive boundaries. But sometimes there are
+ * multiple dives per file, so there can be other events too that
+ * trigger a "new dive" marker and you may get some nesting due
+ * to that. Just ignore nesting levels.
+ */
+static void dive_start(void)
+{
+ unsigned int size;
+
+ alloc_samples = 5;
+ size = dive_size(alloc_samples);
+ dive = malloc(size);
+ if (!dive)
+ exit(1);
+ memset(dive, 0, size);
+}
+
+static void dive_end(void)
+{
+ if (!dive)
+ return;
+ record_dive(dive);
+ dive = NULL;
+}
+
+static void sample_start(void)
+{
+ int nr;
+
+ if (!dive)
+ return;
+ nr = dive->samples;
+ if (nr >= alloc_samples) {
+ unsigned int size;
+
+ alloc_samples = (alloc_samples * 3)/2 + 10;
+ size = dive_size(alloc_samples);
+ dive = realloc(dive, size);
+ if (!dive)
+ return;
+ }
+ sample = dive->sample + nr;
+}
+
+static void sample_end(void)
+{
+ sample = NULL;
+ if (!dive)
+ return;
+ dive->samples++;
+}
+
+static void entry(const char *name, int size, const char *buffer)
+{
+ if (sample) {
+ try_to_fill_sample(sample, name, size, buffer);
+ return;
+ }
+ if (dive) {
+ try_to_fill_dive(dive, name, size, buffer);
+ return;
+ }
+}
+
static const char *nodename(xmlNode *node, char *buf, int len)
{
/* Don't print out the node name if it is "text" */
#define MAXNAME 64
-static void show_one_node(xmlNode *node)
+static void visit_one_node(xmlNode *node)
{
int len;
const unsigned char *content;
name = nodename(node, buffer, sizeof(buffer));
- printf("%s: %.*s\n", name, len, content);
+ entry(name, len, content);
}
-static void show(xmlNode *node)
+static void traverse(xmlNode *node)
{
xmlNode *n;
for (n = node; n; n = n->next) {
- show_one_node(n);
- show(n->children);
+ /* XML from libdivecomputer: 'dive' per new dive */
+ if (!strcmp(n->name, "dive")) {
+ dive_start();
+ traverse(n->children);
+ dive_end();
+ continue;
+ }
+
+ /*
+ * At least both libdivecomputer and Suunto
+ * agree on "sample".
+ *
+ * Well - almost. Ignore case.
+ */
+ if (!strcasecmp(n->name, "sample")) {
+ sample_start();
+ traverse(n->children);
+ sample_end();
+ continue;
+ }
+
+ /* Anything else - just visit it and recurse */
+ visit_one_node(n);
+ traverse(n->children);
}
}
return;
}
- show(xmlDocGetRootElement(doc));
+ dive_start();
+ traverse(xmlDocGetRootElement(doc));
+ dive_end();
xmlFreeDoc(doc);
xmlCleanupParser();
}
projects / ext / subsurface.git / blobdiff