1 files changed, 32 insertions, 1 deletions

diff --git a/navit/maptool/itembin.c b/navit/maptool/itembin.c
index 6f1328355..3996d6f6a 100644
--- a/navit/maptool/itembin.c
+++ b/navit/maptool/itembin.c
@@ -1,4 +1,4 @@
-/**
+/*
  * Navit, a modular navigation system.
  * Copyright (C) 2005-2011 Navit Team
  *
@@ -226,6 +226,37 @@ void item_bin_add_attr_range(struct item_bin *ib, enum attr_type type, short min
     item_bin_add_attr(ib, &attr);
 }
 
+/**
+ * @brief add a "hole" to an item
+ *
+ * This function adds a "hole" (attr_poly_hole) to a map item. It adds the
+ * coordinates and the coordinate count to the existing item.
+ * WARNING: It does NOT allocate any memory, so the memory after the item
+ * must be already allocated for that purpose.
+ * @param[inout] ib item - to add hole to
+ * @param[in] coord - hole coordinate array
+ * @param[in] ccount - number of coordinates in coord
+ */
+void item_bin_add_hole(struct item_bin * ib, struct coord * coord, int ccount) {
+    /* get space for next attr in buffer */
+    int * buffer = ((int *) ib) + ib->len +1;
+    /* get the attr heder in binary file */
+    struct attr_bin * attr = (struct attr_bin *)buffer;
+    /* fill header */
+    attr->len = (ccount *2) + 2;
+    attr->type = attr_poly_hole;
+    /* get the first attr byte in buffer */
+    buffer = (int *)(attr +1);
+    /* for poly_hole, the first 4 bytes are the coordinate count */
+    *buffer = ccount;
+    /* coordinates are behind that */
+    buffer ++;
+    /* copy in the coordinates */
+    memcpy(buffer,coord, ccount * sizeof(struct coord));
+    /* add the hole to the total size */
+    ib->len += attr->len +1;
+}
+
 void item_bin_write(struct item_bin *ib, FILE *out) {
     dbg_assert(fwrite(ib, (ib->len+1)*4, 1, out)==1);
 }