protect against bad tree data

plugins/autochop.cpp

@@ -327,17 +327,24 @@ static bool is_protected(const df::plant * plant, PersistentDataItem &c) {
 }
 
 static int32_t estimate_logs(const df::plant *plant) {
+    if (!plant->tree_info)
+        return 0;
+
     //adapted from code by aljohnston112 @ github
     df::plant_tree_tile** tiles = plant->tree_info->body;
-    df::plant_tree_tile* tilesRow;
 
-    int trunks = 0;
+    if (!tiles)
+        return 0;
+
+    int32_t trunks = 0;
+    const int32_t area = plant->tree_info->dim_y * plant->tree_info->dim_x;
     for (int i = 0; i < plant->tree_info->body_height; i++) {
-        tilesRow = tiles[i];
-        for (int j = 0; j < plant->tree_info->dim_y*plant->tree_info->dim_x; j++) {
+        df::plant_tree_tile* tilesRow = tiles[i];
+        if (!tilesRow)
+            return 0; // tree data is corrupt; let's not touch it
+        for (int j = 0; j < area; j++)
             trunks += tilesRow[j].bits.trunk;
     }
-    }
 
     return trunks;
 }
@@ -386,41 +393,19 @@ static void bucket_watched_burrows(color_ostream & out,
 
 typedef multimap<int, df::plant *, std::greater<int>> TreesBySize;
 
-// returns the number of trees that were newly marked
-static int32_t scan_trees(color_ostream & out, int32_t *expected_yield,
+static int32_t scan_tree(color_ostream & out, df::plant *plant, int32_t *expected_yield,
         TreesBySize *designatable_trees_by_size, bool designate_clearcut,
-        const vector<df::unit *> &citizens, int32_t *accessible_trees = NULL,
-        int32_t *inaccessible_trees = NULL, int32_t *designated_trees = NULL,
-        int32_t *accessible_yield = NULL,
-        map<int32_t, int32_t> *tree_counts = NULL,
-        map<int32_t, int32_t> *designated_tree_counts = NULL) {
-    TRACE(cycle,out).print("scanning trees\n");
-    int32_t newly_marked = 0;
-
-    if (accessible_trees)
-        *accessible_trees = 0;
-    if (inaccessible_trees)
-        *inaccessible_trees = 0;
-    if (designated_trees)
-        *designated_trees = 0;
-    if (expected_yield)
-        *expected_yield = 0;
-    if (accessible_yield)
-        *accessible_yield = 0;
-    if (tree_counts)
-        tree_counts->clear();
-    if (designated_tree_counts)
-        designated_tree_counts->clear();
-
-    map<int, PersistentDataItem *> clearcut_burrows, chop_burrows;
-    bucket_watched_burrows(out, clearcut_burrows, chop_burrows);
-
-    for (auto plant : world->plants.all) {
+        const vector<df::unit *> &citizens, int32_t *accessible_trees,
+        int32_t *inaccessible_trees, int32_t *designated_trees, int32_t *accessible_yield,
+        map<int32_t, int32_t> *tree_counts,
+        map<int32_t, int32_t> *designated_tree_counts,
+        map<int, PersistentDataItem *> &clearcut_burrows,
+        map<int, PersistentDataItem *> &chop_burrows) {
     TRACE(cycle,out).print("  scanning tree at %d,%d,%d\n",
                             plant->pos.x, plant->pos.y, plant->pos.z);
 
     if (!is_valid_tree(plant))
-            continue;
+        return 0;
 
     bool accessible = is_accessible_tree(plant->pos, citizens);
     int32_t yield = estimate_logs(plant);
@@ -441,9 +426,10 @@ static int32_t scan_trees(color_ostream & out, int32_t *expected_yield,
     bucket_tree(plant, designate_clearcut, &designated, &can_chop, tree_counts,
             designated_tree_counts, clearcut_burrows, chop_burrows);
 
+    int32_t ret = 0;
     if (designated) {
         if (!was_designated)
-                ++newly_marked;
+            ret = 1;
         if (designated_trees)
             ++*designated_trees;
         if (expected_yield)
@@ -452,7 +438,51 @@ static int32_t scan_trees(color_ostream & out, int32_t *expected_yield,
         if (designatable_trees_by_size)
             designatable_trees_by_size->emplace(yield, plant);
     }
-    }
+
+    return ret;
+}
+
+// returns the number of trees that were newly marked
+static int32_t scan_trees(color_ostream & out, int32_t *expected_yield,
+        TreesBySize *designatable_trees_by_size, bool designate_clearcut,
+        const vector<df::unit *> &citizens, int32_t *accessible_trees = NULL,
+        int32_t *inaccessible_trees = NULL, int32_t *designated_trees = NULL,
+        int32_t *accessible_yield = NULL,
+        map<int32_t, int32_t> *tree_counts = NULL,
+        map<int32_t, int32_t> *designated_tree_counts = NULL) {
+    TRACE(cycle,out).print("scanning trees\n");
+    int32_t newly_marked = 0;
+
+    if (accessible_trees)
+        *accessible_trees = 0;
+    if (inaccessible_trees)
+        *inaccessible_trees = 0;
+    if (designated_trees)
+        *designated_trees = 0;
+    if (expected_yield)
+        *expected_yield = 0;
+    if (accessible_yield)
+        *accessible_yield = 0;
+    if (tree_counts)
+        tree_counts->clear();
+    if (designated_tree_counts)
+        designated_tree_counts->clear();
+
+    map<int, PersistentDataItem *> clearcut_burrows, chop_burrows;
+    bucket_watched_burrows(out, clearcut_burrows, chop_burrows);
+
+    for (auto plant : world->plants.tree_dry)
+        newly_marked += scan_tree(out, plant, expected_yield, designatable_trees_by_size,
+                                  designate_clearcut, citizens, accessible_trees,
+                                  inaccessible_trees, designated_trees, accessible_yield,
+                                  tree_counts, designated_tree_counts,
+                                  clearcut_burrows, chop_burrows);
+    for (auto plant : world->plants.tree_wet)
+        newly_marked += scan_tree(out, plant, expected_yield, designatable_trees_by_size,
+                                  designate_clearcut, citizens, accessible_trees,
+                                  inaccessible_trees, designated_trees, accessible_yield,
+                                  tree_counts, designated_tree_counts,
+                                  clearcut_burrows, chop_burrows);
 
     return newly_marked;
 }