decompile util

1 files changed, 87 insertions, 0 deletions

diff --git a/src/util.c b/src/util.c
new file mode 100644
index 0000000..0c9c2dd
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,87 @@
+#include "global.h"
+#include "util.h"
+
+void ReverseString(u8 *s, s32 len)
+{
+    u8 *l = s;
+    s32 right = len - 1;
+    u8 *r = s + right;
+    s32 left = 0;
+
+    while (left < right)
+    {
+        u8 temp = *l;
+        *l++ = *r;
+        *r-- = temp;
+        left++;
+        right--;
+    }
+}
+
+s32 ConvertToDecimal(s32 *decimal, s32 n, s32 len)
+{
+    s32 sign;
+    s32 i;
+
+    if (n > 0)
+    {
+        sign = 1;
+    }
+    else
+    {
+        n = -n;
+        sign = -1;
+    }
+
+    for (i = 0; i < len; i++)
+    {
+        decimal[i] = n % 10;
+        n /= 10;
+    }
+
+    return sign;
+}
+
+s32 ConvertFromDecimal(s32 *decimal, s32 sign, s32 len)
+{
+    s32 i;
+    s32 powerOfTen;
+    s32 n = *decimal++;
+
+    for (i = 1, powerOfTen = 10; i < len; i++, powerOfTen *= 10)
+    {
+        n += *decimal++ * powerOfTen;
+    }
+
+    return (sign < 0) ? -n : n;
+}
+
+s32 ConvertFromBCD(s32 bcd)
+{
+    s32 powerOfTen = 1;
+    s32 n = 0;
+
+    while (bcd > 0)
+    {
+        n += (bcd & 0xF) * powerOfTen;
+        powerOfTen *= 10;
+        bcd >>= 4;
+    }
+
+    return n;
+}
+
+s32 ConvertToBCD(s32 n)
+{
+    s32 shift = 0;
+    s32 bcd = 0;
+
+    while (n > 0)
+    {
+        bcd += (n % 10) << shift;
+        shift += 4;
+        n /= 10;
+    }
+
+    return bcd;
+}