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using System;
using System.Collections.Generic;
using System.Text;
namespace com.clusterrr.hakchi_gui
{
public static class GameGeniePatcherNes
{
public static byte[] Patch(byte[] data, string code)
{
code = code.ToUpper().Trim();
if (string.IsNullOrEmpty(code)) return data;
var result = (byte[])data.Clone();
var binaryCode = new StringBuilder(code);
foreach (var l in letterValues.Keys)
binaryCode.Replace(l.ToString(), letterValues[l]);
byte value, compare;
UInt16 address;
if (binaryCode.Length == 24)
{
if (binaryCode[8] != '0') throw new GameGenieFormatException(code);
try
{
value = Convert.ToByte(new string(new char[] { binaryCode[0], binaryCode[5], binaryCode[6], binaryCode[7], binaryCode[20], binaryCode[1], binaryCode[2], binaryCode[3] }), 2);
address = Convert.ToUInt16(new string(new char[] { binaryCode[13], binaryCode[14], binaryCode[15], binaryCode[16], binaryCode[21], binaryCode[22], binaryCode[23], binaryCode[4], binaryCode[9], binaryCode[10], binaryCode[11], binaryCode[12], binaryCode[17], binaryCode[18], binaryCode[19] }), 2);
}
catch
{
throw new GameGenieFormatException(code);
}
if (result.Length <= 0x8000)
{
result[address % result.Length] = value;
}
else
{
int pos = address % 0x2000;
while (pos < result.Length)
{
result[pos] = value;
pos += 0x2000;
}
}
}
else if (binaryCode.Length == 32)
{
if (binaryCode[8] != '1') throw new GameGenieFormatException(code);
try
{
value = Convert.ToByte(new string(new char[] { binaryCode[0], binaryCode[5], binaryCode[6], binaryCode[7], binaryCode[28], binaryCode[1], binaryCode[2], binaryCode[3] }), 2);
address = Convert.ToUInt16(new string(new char[] { binaryCode[13], binaryCode[14], binaryCode[15], binaryCode[16], binaryCode[21], binaryCode[22], binaryCode[23], binaryCode[4], binaryCode[9], binaryCode[10], binaryCode[11], binaryCode[12], binaryCode[17], binaryCode[18], binaryCode[19] }), 2);
compare = Convert.ToByte(new string(new char[] { binaryCode[24], binaryCode[29], binaryCode[30], binaryCode[31], binaryCode[20], binaryCode[25], binaryCode[26], binaryCode[27] }), 2);
}
catch
{
throw new GameGenieFormatException(code);
}
bool replaced = false;
int pos = address % 0x2000;
while (pos < result.Length)
{
if (result[pos] == compare)
{
result[pos] = value;
replaced = true;
}
pos += 0x2000;
}
if (!replaced) throw new GameGenieNotFoundException(code);
}
else throw new GameGenieFormatException(code);
return result;
}
static Dictionary<char, string> letterValues = new Dictionary<char, string>()
{
{ 'A', "0000" },
{ 'P', "0001" },
{ 'Z', "0010" },
{ 'L', "0011" },
{ 'G', "0100" },
{ 'I', "0101" },
{ 'T', "0110" },
{ 'Y', "0111" },
{ 'E', "1000" },
{ 'O', "1001" },
{ 'X', "1010" },
{ 'U', "1011" },
{ 'K', "1100" },
{ 'S', "1101" },
{ 'V', "1110" },
{ 'N', "1111" }
};
}
}
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