From bb056ee4d3b41a695600292aede1b6121062b005 Mon Sep 17 00:00:00 2001
From: Justin Scofield <47263509+scawful@users.noreply.github.com>
Date: Tue, 12 Jul 2022 08:03:53 -0400
Subject: [PATCH] Added HexToDec routine from hmagic

---
 src/app/core/common.cc | 35 +++++++++++++++++++++++++++++++++++
 src/app/core/common.h  |  1 +
 2 files changed, 36 insertions(+)

diff --git a/src/app/core/common.cc b/src/app/core/common.cc
index d1bbb0f2..98a48e25 100644
--- a/src/app/core/common.cc
+++ b/src/app/core/common.cc
@@ -18,6 +18,41 @@ int AddressFromBytes(uint8_t addr1, uint8_t addr2, uint8_t addr3) {
   return (addr1 << 16) | (addr2 << 8) | addr3;
 }
 
+//hextodec has been imported from SNESDisasm to parse hex numbers
+int HexToDec(char *input, int length)
+{
+    int result = 0;
+    int value;
+    int ceiling = length - 1;
+    int power16 = 16;
+
+    int j = ceiling;
+
+    for( ;  j >= 0; j--)
+    {
+        if(input[j] >= 'A' && input[j] <= 'F')
+        {
+            value = input[j] - 'F';
+            value += 15;
+        }
+        else
+        {
+            value = input[j] - '9';
+            value += 9;
+        }
+
+        if(j == ceiling)
+        {
+            result += value;
+            continue;
+        }
+
+        result += (value * power16);
+        power16 *= 16;
+    }
+    
+    return result;
+}
 
 }  // namespace core
 }  // namespace app
diff --git a/src/app/core/common.h b/src/app/core/common.h
index 60c1396c..5217f66f 100644
--- a/src/app/core/common.h
+++ b/src/app/core/common.h
@@ -9,6 +9,7 @@ namespace core {
 
 unsigned int SnesToPc(unsigned int addr);
 int AddressFromBytes(uint8_t addr1, uint8_t addr2, uint8_t addr3);
+int HexToDec(char *input, int length);
 
 }  // namespace core
 }  // namespace app