public static int ByteswapROM(string filename)
{
using (BinaryReader ROM = new BinaryReader(File.OpenRead(filename)))
{
if (ROM.BaseStream.Length % 4 != 0)
{
return(-1);
}
byte[] buffer = new byte[4];
ROM.Read(buffer, 0, 4);
// very hacky
ROM.BaseStream.Seek(0, 0);
if (buffer[0] == 0x80)
{
return(1);
}
else if (buffer[1] == 0x80)
{
using (BinaryWriter newROM = new BinaryWriter(File.Open(filename + ".z64", FileMode.Create)))
{
while (ROM.BaseStream.Position < ROM.BaseStream.Length)
{
newROM.Write(ReadWriteUtils.Byteswap16(ReadWriteUtils.ReadU16(ROM)));
}
}
return(0);
}
else if (buffer[3] == 0x80)
{
using (BinaryWriter newROM = new BinaryWriter(File.Open(filename + ".z64", FileMode.Create)))
{
while (ROM.BaseStream.Position < ROM.BaseStream.Length)
{
newROM.Write(ReadWriteUtils.Byteswap32(ReadWriteUtils.ReadU32(ROM)));
}
}
return(0);
}
}
return(-1);
}
public static byte[] CreatePatch(string filename, List <MMFile> originalMMFiles)
{
var hashAlg = new SHA256Managed();
using (var outStream = filename != null ? (Stream)File.Open(Path.ChangeExtension(filename, "mmr"), FileMode.Create) : new MemoryStream())
using (var cryptoStream = new CryptoStream(outStream, hashAlg, CryptoStreamMode.Write))
{
using (var compressStream = new GZipStream(cryptoStream, CompressionMode.Compress))
using (var writer = new BinaryWriter(compressStream))
{
writer.Write(ReadWriteUtils.Byteswap32(PatchUtils.PATCH_MAGIC));
writer.Write(ReadWriteUtils.Byteswap32((uint)PatchUtils.PATCH_VERSION));
for (var fileIndex = 0; fileIndex < RomData.MMFileList.Count; fileIndex++)
{
var file = RomData.MMFileList[fileIndex];
var fileIsStatic = file.IsStatic ? 1 : 0;
if (file.Data == null || (file.IsCompressed && !file.WasEdited))
{
continue;
}
if (fileIndex >= originalMMFiles.Count)
{
writer.Write(ReadWriteUtils.Byteswap32((uint)fileIndex));
writer.Write(ReadWriteUtils.Byteswap32((uint)file.Addr));
writer.Write(ReadWriteUtils.Byteswap32((uint)0));
writer.Write(ReadWriteUtils.Byteswap32((uint)fileIsStatic));
writer.Write(ReadWriteUtils.Byteswap32((uint)file.Data.Length));
writer.Write(file.Data);
continue;
}
CheckCompressed(fileIndex, originalMMFiles);
var originalFile = originalMMFiles[fileIndex];
if (file.Data.Length != originalFile.Data.Length)
{
writer.Write(ReadWriteUtils.Byteswap32((uint)fileIndex));
writer.Write(ReadWriteUtils.Byteswap32((uint)file.Addr));
writer.Write(-1);
writer.Write(ReadWriteUtils.Byteswap32((uint)fileIsStatic));
writer.Write(ReadWriteUtils.Byteswap32((uint)file.Data.Length));
writer.Write(file.Data);
continue;
}
int?modifiedIndex = null;
var modifiedBuffer = new List <byte>();
for (var i = 0; i <= file.Data.Length; i++)
{
if (i == file.Data.Length || file.Data[i] == originalFile.Data[i])
{
if (modifiedBuffer.Any())
{
writer.Write(ReadWriteUtils.Byteswap32((uint)fileIndex));
writer.Write(ReadWriteUtils.Byteswap32((uint)file.Addr));
writer.Write(ReadWriteUtils.Byteswap32((uint)modifiedIndex.Value));
writer.Write(ReadWriteUtils.Byteswap32((uint)fileIsStatic));
writer.Write(ReadWriteUtils.Byteswap32((uint)modifiedBuffer.Count));
writer.Write(modifiedBuffer.ToArray());
modifiedBuffer.Clear();
modifiedIndex = null;
continue;
}
}
else
{
if (!modifiedIndex.HasValue)
{
modifiedIndex = i;
}
modifiedBuffer.Add(file.Data[i]);
}
}
}
}
return(hashAlg.Hash);
}
}
