public static long Recreate(IStorage fragmentMeta, FileStream writer, IFileSystem newBaseFolderFs)
{
var Segments = new List<DeltaFragmentSegment>();
if (fragmentMeta.GetSize() < 0x40)
{
throw new InvalidDataException("Delta file is too small.");
}
var magic = new byte[4];
fragmentMeta.Read(magic, 0, 4, 0);
var reader = new FileReader(new StorageFile(fragmentMeta, OpenMode.Read));
if (Utils.ArraysEqual(magic, DeltaTools.LCA3Macic))
{
reader.Position = DeltaTools.LCA3Macic.Length;
var linkedNcaFilenameSize = reader.ReadUInt8();
var linkedNcafilename =
Encoding.ASCII.GetString(reader.ReadBytes(DeltaTools.LCA3Macic.Length + 1, linkedNcaFilenameSize,
true));
var newLinkedFile = newBaseFolderFs.OpenFile(linkedNcafilename, OpenMode.Read).AsStream();
newLinkedFile.CopyStream(writer, newLinkedFile.Length);
return reader.Position;
}
var Header = new DeltaFragmentHeader(new StorageFile(fragmentMeta, OpenMode.Read));
reader.Position = 0;
if (Header.Magic == DeltaTools.Tdv0Magic)
{
var headerData = reader.ReadBytes(0, (int) Header.FragmentHeaderSize, true);
headerData[0] = 0x4E; //N (TDV0 to NDV0)
writer.Write(headerData, 0, (int) Header.FragmentHeaderSize);
}
else if (Header.Magic == DeltaTools.Cdv0Magic)
{
reader.Position = 4;
}
else
{
throw new InvalidDataException("TDV0/CDV0 magic value is missing.");
}
var pos = reader.Position;
var baseNcaFilenameSize = reader.ReadUInt8();
var filenameOffset =
Encoding.ASCII.GetString(reader.ReadBytes(pos + 1, baseNcaFilenameSize, true)).Split(':');
var newBaseFile = newBaseFolderFs.OpenFile(filenameOffset[0], OpenMode.Read).AsStream();
long offset = 0;
var endOffset = Header.NewSize;
if (filenameOffset.Length > 2)
{
offset = long.Parse(filenameOffset[1], NumberStyles.HexNumber);
endOffset = long.Parse(filenameOffset[2], NumberStyles.HexNumber);
}
const int maxBS = 10485760; //10 MB
int bs;
var FragmentBlock = new byte[maxBS];
while (offset < endOffset)
{
Console.WriteLine($"ReadSegmentHeader on {offset}");
ReadSegmentHeader(reader, writer, out var size, out var seek);
Console.WriteLine($"size: {size}, seek: {seek}, readerPos: {reader.Position}, writerPos: {writer.Position}");
if (seek > 0)
{
var segment = new DeltaFragmentSegment
{
SourceOffset = offset,
Size = seek,
IsInOriginal = true
};
Segments.Add(segment);
offset += seek;
}
if (size > 0)
{
var segment = new DeltaFragmentSegment
{
SourceOffset = reader.Position,
Size = size,
IsInOriginal = false
};
newBaseFile.Position = offset;
var fragmentOffsetEnd = offset + segment.Size;
while (newBaseFile.Position < fragmentOffsetEnd)
{
bs = (int) Math.Min(fragmentOffsetEnd - newBaseFile.Position, maxBS);
newBaseFile.Read(FragmentBlock, 0, bs);
writer.Write(FragmentBlock, 0, bs);
}
Segments.Add(segment);
offset += size;
}
}
newBaseFile.Dispose();
return reader.Position;
}
public static long Save(IStorage delta, FileStream writer, string foundBaseNCA)
{
var filenameOffset = foundBaseNCA.Split(':');
if (delta.GetSize() < 0x40)
{
throw new InvalidDataException("Delta file is too small.");
}
if (foundBaseNCA.Length > 255)
{
throw new IndexOutOfRangeException("Base NCA filename isn't allowed to be longer then 255 characters");
}
var Header = new DeltaFragmentHeader(new StorageFile(delta, OpenMode.Read));
var reader = new FileReader(new StorageFile(delta, OpenMode.Read));
reader.Position = 0;
if (filenameOffset.Length == 1 && Header.Magic != DeltaTools.Ndv0Magic)
{
writer.Write(DeltaTools.LCA3Macic, 0, DeltaTools.LCA3Macic.Length);
writer.WriteByte((byte)foundBaseNCA.Length);
writer.Write(Encoding.ASCII.GetBytes(foundBaseNCA), 0, foundBaseNCA.Length);
return(0);
}
if (Header.Magic == DeltaTools.Ndv0Magic)
{
var fragmentSize = Header.FragmentHeaderSize + Header.FragmentBodySize;
//if (!isSplitNdv0 && delta.Length < fragmentSize)
//{
// throw new InvalidDataException(
// $"Delta file is smaller than the header indicates. (0x{fragmentSize} bytes)");
//}
var headerData = reader.ReadBytes((int)Header.FragmentHeaderSize);
headerData[0] = 0x54; //T (NDV0 to TDV0)
writer.Write(headerData, 0, (int)Header.FragmentHeaderSize);
}
else
{
writer.Write(Encoding.ASCII.GetBytes(DeltaTools.Cdv0Magic), 0, DeltaTools.Cdv0Magic.Length);
}
writer.WriteByte((byte)foundBaseNCA.Length);
writer.Write(Encoding.ASCII.GetBytes(foundBaseNCA), 0, foundBaseNCA.Length);
var foundBaseNCAEndOffsetPos = foundBaseNCA.LastIndexOf(':') + 1;
var foundBaseNCAEndOffsetLen = foundBaseNCA.Length - foundBaseNCAEndOffsetPos;
var SplitNdv0EndOffsetPos = writer.Position - foundBaseNCAEndOffsetLen;
long offset = 0;
long deltaSize = delta.GetSize();
Console.WriteLine($"reader={reader.Position} writer={writer.Position}");
while (reader.Position < deltaSize)
{
ReadSegmentHeader(reader, writer, out var size, out var seek);
if (seek > 0)
{
offset += seek;
}
if (size > 0)
{
offset += size;
}
reader.Position += size;
}
if (reader.Position == deltaSize)
{
if (filenameOffset.Length > 2)
{
var startOffset = long.Parse(filenameOffset[1], NumberStyles.HexNumber);
var endOffset = startOffset + offset;
var realEndOffset = endOffset.ToString($"X{foundBaseNCAEndOffsetLen}");
var posReal = writer.Position;
writer.Position = SplitNdv0EndOffsetPos;
writer.Write(Encoding.ASCII.GetBytes(realEndOffset), 0, realEndOffset.Length);
writer.Position = posReal;
}
//Size of data untimmed in this function call
return(offset);
}
throw new InvalidDataException("Fragment file seems to be corrupted!");
}
