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using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;
namespace com.clusterrr.hakchi_gui
{
public static class GameGeniePatcherSnes
{
public static byte[] Patch(byte[] data, string code)
{
code = code.ToUpper().Trim();
if (string.IsNullOrEmpty(code)) return data;
if (code.Length != 9 || code[4] != '-')
throw new GameGenieFormatException(code);
code = Regex.Replace(code, "[^0-9A-F]", "");
if (code.Length != 8)
throw new GameGenieFormatException(code);
byte value = Convert.ToByte(code.Substring(0, 2), 16);
code = code.Substring(2);
var binaryCode = new StringBuilder();
foreach (char c in code)
binaryCode.Append(letterValues[c]);
var decoded = new StringBuilder(new string(' ', binaryCode.Length));
for (int i = 0; i < binaryCode.Length; i++)
{
var c = codeSeq[i];
var pos = clearSeq.IndexOf(c);
decoded[pos] = binaryCode[i];
}
SnesGame.SnesRomType romType;
string gameTitle;
SnesGame.GetCorrectHeader(data, out romType, out gameTitle);
UInt32 address = (Convert.ToUInt32(decoded.ToString(), 2)) & 0x3FFFFF;
if (romType == SnesGame.SnesRomType.LoRom)
address = address & 0x3FFFF;
var result = (byte[])data.Clone();
if (address >= result.Length)
throw new GameGenieFormatException(code);
result[address] = value;
return result;
}
static Dictionary<char, string> letterValues = new Dictionary<char, string>()
{
{ 'D', "0000" },
{ 'F', "0001" },
{ '4', "0010" },
{ '7', "0011" },
{ '0', "0100" },
{ '9', "0101" },
{ '1', "0110" },
{ '5', "0111" },
{ '6', "1000" },
{ 'B', "1001" },
{ 'C', "1010" },
{ '8', "1011" },
{ 'A', "1100" },
{ '2', "1101" },
{ '3', "1110" },
{ 'E', "1111" }
};
const string codeSeq = "ijklqrstopabcduvwxefghmn";
const string clearSeq = "abcdefghijklmnopqrstuvwx";
}
}
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