1 files changed, 24 insertions, 0 deletions
diff --git a/pokemontools/pointers.py b/pokemontools/pointers.py
new file mode 100644
index 0000000..161a53e
--- /dev/null
+++ b/pokemontools/pointers.py
@@ -0,0 +1,24 @@
+# -*- coding: utf-8 -*-
+"""
+Various functions related to pointer and address math. Mostly to avoid
+depedency loops.
+"""
+
+def calculate_bank(address):
+    """you are too lazy to divide on your own?"""
+    if type(address) == str:
+        address = int(address, 16)
+    #if 0x4000 <= address <= 0x7FFF:
+    #    raise Exception, "bank 1 does not exist"
+    return int(address) / 0x4000
+
+def calculate_pointer(short_pointer, bank=None):
+    """calculates the full address given a 4-byte pointer and bank byte"""
+    short_pointer = int(short_pointer)
+    if 0x4000 <= short_pointer <= 0x7fff:
+        short_pointer -= 0x4000
+        bank = int(bank)
+    else:
+        bank = 0
+    pointer = short_pointer + (bank * 0x4000)
+    return pointer