/// <summary>
/// Applies the given filename patch to the in-memory RomData
/// </summary>
/// <param name="filename"></param>
/// <returns>SHA256 hash of the patch.</returns>
public static byte[] ApplyPatch(string filename)
{
var hashAlg = new SHA256Managed();
using (var filestream = File.OpenRead(filename))
using (var cryptoStream = new CryptoStream(filestream, hashAlg, CryptoStreamMode.Read))
using (var decompressStream = new GZipStream(cryptoStream, CompressionMode.Decompress))
using (var memoryStream = new MemoryStream())
{
decompressStream.CopyTo(memoryStream);
memoryStream.Seek(0, SeekOrigin.Begin);
using (var reader = new BinaryReader(memoryStream))
{
var magic = ReadWriteUtils.ReadU32(reader);
var version = ReadWriteUtils.ReadU32(reader);
// Validate patch magic and version values
PatchUtils.Validate(magic, version);
while (reader.BaseStream.Position != reader.BaseStream.Length)
{
var fileIndex = ReadWriteUtils.ReadS32(reader);
var fileAddr = ReadWriteUtils.ReadS32(reader);
var index = ReadWriteUtils.ReadS32(reader);
var isStatic = ReadWriteUtils.ReadS32(reader) != 0 ? true : false;
var length = ReadWriteUtils.ReadS32(reader);
var data = reader.ReadBytes(length);
if (fileIndex >= RomData.MMFileList.Count)
{
var newFile = new MMFile
{
Addr = fileAddr,
IsCompressed = false,
Data = data,
End = fileAddr + data.Length,
IsStatic = isStatic,
};
RomUtils.AppendFile(newFile);
}
if (index == -1)
{
RomData.MMFileList[fileIndex].Data = data;
if (data.Length == 0)
{
RomData.MMFileList[fileIndex].Cmp_Addr = -1;
RomData.MMFileList[fileIndex].Cmp_End = -1;
}
}
else
{
CheckCompressed(fileIndex);
ReadWriteUtils.Arr_Insert(data, 0, data.Length, RomData.MMFileList[fileIndex].Data, index);
}
}
}
return(hashAlg.Hash);
}
}
public static void ReadFileTable(BinaryReader ROM)
{
RomData.MMFileList = new List <MMFile>();
ROM.BaseStream.Seek(FILE_TABLE, SeekOrigin.Begin);
while (true)
{
MMFile Current_File = new MMFile
{
Addr = ReadWriteUtils.ReadS32(ROM),
End = ReadWriteUtils.ReadS32(ROM),
Cmp_Addr = ReadWriteUtils.ReadS32(ROM),
Cmp_End = ReadWriteUtils.ReadS32(ROM)
};
Current_File.IsCompressed = Current_File.Cmp_End != 0;
if (Current_File.Addr == Current_File.End)
{
break;
}
RomData.MMFileList.Add(Current_File);
}
ExtractAll(ROM);
}
