From 6d88e3bee20e44c0ba39889e47c17cd5681a5421 Mon Sep 17 00:00:00 2001
From: Imanol-Mikel Barba Sabariego <imanol@imanolbarba.net>
Date: Sat, 25 Jul 2020 19:54:32 +0100
Subject: [PATCH] Adding waypoint stuff, and a some sanity checks (need a lot more)

---
 d2waypoints.c | 20 ++++++++++++++++++++
 d2waypoints.h | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 90 insertions(+), 0 deletions(-)
 create mode 100644 d2waypoints.c
 create mode 100644 d2waypoints.h

diff --git a/d2waypoints.c b/d2waypoints.c
new file mode 100644
index 0000000..e7322ab
--- /dev/null
+++ b/d2waypoints.c
@@ -0,0 +1,20 @@
+#include "d2waypoints.h"
+
+int isWaypointActivated(D2WaypointsData* d, unsigned int waypoint, unsigned int difficulty) {
+    if(waypoint > D2S_WAYPOINTSDATA_NUMWAYPOINTS) {
+        return -1;
+    }
+    unsigned int byte = waypoint / 8;
+    unsigned int offset = waypoint % 8;
+    return (d->waypoints[difficulty].waypointData[byte] & (1 << offset)) >> offset;
+}
+
+// TODO: Return success
+void setWaypointActivated(D2WaypointsData* d, unsigned int waypoint, unsigned int difficulty, int activated) {
+    if(waypoint > D2S_WAYPOINTSDATA_NUMWAYPOINTS) {
+        return;
+    }
+    unsigned int byte = waypoint / 8;
+    unsigned int offset = waypoint % 8;
+    d->waypoints[difficulty].waypointData[byte] |= (1 << offset);
+}
\ No newline at end of file
diff --git a/d2waypoints.h b/d2waypoints.h
new file mode 100644
index 0000000..c5172ee
--- /dev/null
+++ b/d2waypoints.h
@@ -0,0 +1,70 @@
+#ifndef D2WAYPOINTS_H
+#define D2WAYPOINTS_H
+
+#include <stdint.h>
+
+#include "d2strings.h"
+
+#define D2S_WAYPOINTSDATA_HEADER_LENGTH 2
+#define D2S_WAYPOINTSDATA_LENGTH 5
+#define D2S_WAYPOINTSDATA_NUMWAYPOINTS 39
+
+const char* const waypoints[] = {
+    D2S_WAYPOINT_0,
+    D2S_WAYPOINT_1,
+    D2S_WAYPOINT_2,
+    D2S_WAYPOINT_3,
+    D2S_WAYPOINT_4,
+    D2S_WAYPOINT_5,
+    D2S_WAYPOINT_6,
+    D2S_WAYPOINT_7,
+    D2S_WAYPOINT_8,
+    D2S_WAYPOINT_9,
+    D2S_WAYPOINT_10,
+    D2S_WAYPOINT_11,
+    D2S_WAYPOINT_12,
+    D2S_WAYPOINT_13,
+    D2S_WAYPOINT_14,
+    D2S_WAYPOINT_15,
+    D2S_WAYPOINT_16,
+    D2S_WAYPOINT_17,
+    D2S_WAYPOINT_18,
+    D2S_WAYPOINT_19,
+    D2S_WAYPOINT_20,
+    D2S_WAYPOINT_21,
+    D2S_WAYPOINT_22,
+    D2S_WAYPOINT_23,
+    D2S_WAYPOINT_24,
+    D2S_WAYPOINT_25,
+    D2S_WAYPOINT_26,
+    D2S_WAYPOINT_27,
+    D2S_WAYPOINT_28,
+    D2S_WAYPOINT_29,
+    D2S_WAYPOINT_30,
+    D2S_WAYPOINT_31,
+    D2S_WAYPOINT_32,
+    D2S_WAYPOINT_33,
+    D2S_WAYPOINT_34,
+    D2S_WAYPOINT_35,
+    D2S_WAYPOINT_36,
+    D2S_WAYPOINT_37,
+    D2S_WAYPOINT_38
+};
+
+typedef struct __attribute__((packed)) {
+    uint16_t unknown1; // Apparently, always 0x0201
+    uint8_t waypointData[D2S_WAYPOINTSDATA_LENGTH];
+    uint8_t unknown2[17];
+} D2Waypoints;
+
+typedef struct __attribute__((packed)) {
+    const char* header[D2S_WAYPOINTSDATA_HEADER_LENGTH]; // WS
+    uint32_t unknown1; // This is likely version data
+    uint16_t size; // in bytes
+    D2Waypoints waypoints[3]; // 1 set for each difficulty
+} D2WaypointsData;
+
+int isWaypointActivated(D2WaypointsData* d, unsigned int waypoint, unsigned int difficulty);
+void setWaypointActivated(D2WaypointsData* d, unsigned int waypoint, unsigned int difficulty, int activated);
+
+#endif
\ No newline at end of file
--
libgit2 0.22.2