1 files changed, 35 insertions, 0 deletions
diff --git a/subsurface-core/gaspressures.h b/subsurface-core/gaspressures.h
new file mode 100644
index 000000000..420c117a2
--- /dev/null
+++ b/subsurface-core/gaspressures.h
@@ -0,0 +1,35 @@
+#ifndef GASPRESSURES_H
+#define GASPRESSURES_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * simple structure to track the beginning and end tank pressure as
+ * well as the integral of depth over time spent while we have no
+ * pressure reading from the tank */
+typedef struct pr_track_struct pr_track_t;
+struct pr_track_struct {
+	int start;
+	int end;
+	int t_start;
+	int t_end;
+	int pressure_time;
+	pr_track_t *next;
+};
+
+typedef struct pr_interpolate_struct pr_interpolate_t;
+struct pr_interpolate_struct {
+	int start;
+	int end;
+	int pressure_time;
+	int acc_pressure_time;
+};
+
+enum interpolation_strategy {SAC, TIME, CONSTANT};
+
+#ifdef __cplusplus
+}
+#endif
+#endif // GASPRESSURES_H