/// <summary> /// Returns the original file contents without patching. /// </summary> /// <returns></returns> public virtual ByteSlice RetrieveOriginalData() { var fatEntry = RawFAT.Slice(EntryID * FATEntrySize, FATEntrySize); uint lowerBound = BitConverter.ToUInt32(fatEntry.Slice(0, sizeof(uint)).GetAsArrayCopy(), 0); uint upperBound = BitConverter.ToUInt32(fatEntry.Slice(sizeof(uint), sizeof(uint)).GetAsArrayCopy(), 0); return(Filesystem.ROM.Data.Slice((int)lowerBound, (int)(upperBound - lowerBound))); }
public static byte[] Decompress(ByteSlice inputData) { // LZ77 in Mario Party DS always starts with an unknown byte // Adapted from https://github.com/Dirbaio/NSMB-Editor/blob/master/NSMBe4/ROM.cs byte[] uncompressedLengthData = new byte[4]; Array.Copy(inputData.Slice(1, 3).GetAsArrayCopy(), uncompressedLengthData, 3); int uncompressedLength = BitConverter.ToInt32(uncompressedLengthData, 0); var input = new BinaryReader(new MemoryStream(inputData.GetAsArrayCopy())); input.BaseStream.Seek(4, SeekOrigin.Begin); var output = new byte[uncompressedLength]; int outputIndex = 0; while (outputIndex < uncompressedLength) { byte decisionByte = input.ReadByte(); for (int bit = 7; bit >= 0; bit--) { bool referencePastData = (decisionByte & (1 << bit)) != 0; if (referencePastData) { int pointerData = (input.ReadByte() << 8) | input.ReadByte(); int length = (pointerData >> 12) + 3; int offset = pointerData & 0xFFF; int windowOffset = outputIndex - offset - 1; for (int pointByte = 0; pointByte < length; pointByte++) { output[outputIndex++] = output[windowOffset++]; if (outputIndex == uncompressedLength) { return(output); } } } else { output[outputIndex++] = input.ReadByte(); if (outputIndex == uncompressedLength) { return(output); } } } } return(output); }
public void Initialize() { Dictionary <ushort, NDSDirectory> directories = new Dictionary <ushort, NDSDirectory>(); Dictionary <ushort, NDSFile> files = new Dictionary <ushort, NDSFile>(); // The maximum address we can access while reading metaentries. uint dirEntriesAddrLimit = BitConverter.ToUInt32(RawFNT.Slice(0, sizeof(uint)).GetAsArrayCopy(), startIndex: 0); // We create a dictionary for children before setting them because folders/files may be out of order // and parents may not exist before referencing them. var childrenStructure = new Dictionary <ushort, List <ushort> >(); // Everything before this entry in the FAT is an overlay file. ushort firstDataFileID = BitConverter.ToUInt16(RawFNT.Slice(sizeof(uint), sizeof(ushort)).GetAsArrayCopy(), startIndex: 0); // 0xFFFF is just a fictional ID used for convenience. RootOverlayDirectory = new NDSDirectory(this, 0xFFFF, "overlay"); for (ushort overlayID = 0; overlayID < firstDataFileID; overlayID++) { RootOverlayDirectory.ChildrenFiles.Add(new NDSFile(this, overlayID, $"overlay_{overlayID}") { Parent = RootOverlayDirectory }); } for (int currentRelativeAddress = 0; currentRelativeAddress < dirEntriesAddrLimit; currentRelativeAddress += DirectoryEntrySize) { ByteSlice dirEntry = RawFNT.Slice(currentRelativeAddress, DirectoryEntrySize); // The address of the first named entry inside of this directory. uint namedEntryAddress = BitConverter.ToUInt32(dirEntry.Slice(0, sizeof(uint)).GetAsArrayCopy(), startIndex: 0); // The ID of the first file in this directory. ushort firstFileID = BitConverter.ToUInt16(dirEntry.Slice(sizeof(uint), sizeof(ushort)).GetAsArrayCopy(), startIndex: 0); // The ID of the parent of this directory. If folder is root, this will not start with 0xF000. ushort parentDirID = BitConverter.ToUInt16(dirEntry.Slice(sizeof(uint) + sizeof(ushort), sizeof(ushort)).GetAsArrayCopy(), startIndex: 0); // The ID of the directory that all these files belong to. ushort containerDirID = (ushort)(currentRelativeAddress / DirectoryEntrySize + EntryDirectoryFlag); ByteSlice namedEntry = RawFNT.Slice((int)namedEntryAddress, RawFNT.Size); readNamedEntry(namedEntry, firstFileID); void readNamedEntry(ByteSlice namedEntry, ushort fileID) { if (namedEntry[0] == 0) { return; } bool isDirectory = (namedEntry[0] & 0b10000000) > 0; byte nameLength = (byte)(namedEntry[0] & 0b01111111); string name = Encoding.UTF8.GetString(namedEntry.Slice(1, nameLength).GetAsArrayCopy()); if (isDirectory) { ushort entryID = BitConverter.ToUInt16(namedEntry.Slice(1 + nameLength, sizeof(ushort)).GetAsArrayCopy(), startIndex: 0); namedEntry.SliceEnd = namedEntry.SliceStart + 1 + nameLength + sizeof(ushort); var directory = new NDSDirectory(this, entryID, name); directories.Add(entryID, directory); // If the parent is not a directory, then this entry represents the root directory (/data/) if ((parentDirID & EntryDirectoryFlag) == 0) { RootDataDirectory = directory; } else { childrenStructure.TryGetValue(containerDirID, out var parent); if (parent == null) { childrenStructure.Add(containerDirID, new List <ushort>() { entryID }); } else { parent.Add(entryID); } } } else { namedEntry.SliceEnd = namedEntry.SliceStart + 1 + nameLength; var file = new NDSFile(this, fileID, name); if (files.ContainsKey(fileID)) { files[fileID] = file; Console.WriteLine($"[NDSFilesystem.Initialize] The file {fileID} was repeated!"); } else { files.Add(fileID, file); } childrenStructure.TryGetValue(containerDirID, out var parent); if (parent == null) { childrenStructure.Add(containerDirID, new List <ushort>() { fileID }); } else { parent.Add(fileID); } } // Read next entry readNamedEntry(RawFNT.Slice(namedEntry.SliceEnd - RawFNT.SliceStart, RawFNT.Size), (ushort)(fileID + 1)); } } foreach (var parentRelations in childrenStructure) { directories.TryGetValue(parentRelations.Key, out var parent); if (parent == null) { Console.WriteLine($"[NDSFilesystem.Initialize] Parent 0x{parentRelations.Key:X} does not exist as a directory!! (First child: {files[parentRelations.Value.First()].Name})"); continue; } else { foreach (var child in parentRelations.Value) { if ((child & EntryDirectoryFlag) > 0) { parent.ChildrenDirectories.Add(directories[child]); directories[child].Parent = parent; } else { parent.ChildrenFiles.Add(files[child]); files[child].Parent = parent; } } } } }
// TODO: This is not the most elegant way to do this... /// <summary> /// Updates a byteslice with the same size as the ROM to reflect the filesystem's contents. This method will NOT change the header of the ROM, /// nor any sensitive data. For now, only updates the FAT & file data, not the FNT. /// </summary> public void PackTo(ByteSlice target) { ByteSlice targetRawFAT = target.Slice((int)ROM.Header.FATAddress, (int)ROM.Header.FATSize); ByteSlice targetHeader = ROM.Header.Data; targetHeader.Source = target.Source; ByteSlice targetRawFNT = RawFNT; targetRawFNT.Source = target.Source; const int fatEntrySize = 8; ByteSlice[] protectedMemoryRanges = new ByteSlice[] { targetHeader, targetRawFNT, targetRawFAT, target.Slice((int)ROM.Header.ARM9CodeAddress, (int)ROM.Header.ARM9CodeSize), target.Slice((int)ROM.Header.ARM7CodeAddress, (int)ROM.Header.ARM7CodeSize), target.Slice((int)ROM.Header.ARM9OverlayTableAddress, (int)ROM.Header.ARM9OverlayTableSize), target.Slice((int)ROM.Header.ARM7OverlayTableAddress, (int)ROM.Header.ARM7OverlayTableSize), target.Slice((int)ROM.Header.BannerAddress, (int)ROM.Header.BannerSize) }; uint lastFileSaveAddress = 0; void SaveFile(NDSFile file) { int filesize = file.LatestVersionSize; ByteSlice GetFileSlice() => target.Slice((int)lastFileSaveAddress, filesize); IEnumerable <ByteSlice> calculateRangesIntersecting() => from range in protectedMemoryRanges where range.Intersects(GetFileSlice()) select range; for (var rangesIntersecting = calculateRangesIntersecting(); rangesIntersecting.Any(); rangesIntersecting = calculateRangesIntersecting()) { lastFileSaveAddress = (uint)rangesIntersecting.First().SliceEnd; } Console.WriteLine($"Found space for file: {lastFileSaveAddress:X}"); if (lastFileSaveAddress + filesize > target.SliceEnd) { throw new Exception("No space in ROM to fit any more files!"); } GetFileSlice().ReplaceWith(new ByteSlice(file.RetrieveLatestVersionData())); Console.WriteLine($"Changed {filesize}B."); var fileROMBounds = target.Slice((int)lastFileSaveAddress, filesize); // Change FAT entry (lower and upper bound) targetRawFAT.Slice(file.EntryID * fatEntrySize, sizeof(uint)).ReplaceWith(new ByteSlice(BitConverter.GetBytes(fileROMBounds.SliceStart))); targetRawFAT.Slice(file.EntryID * fatEntrySize + sizeof(uint), sizeof(uint)).ReplaceWith(new ByteSlice(BitConverter.GetBytes(fileROMBounds.SliceEnd))); lastFileSaveAddress += (uint)filesize; } void SaveDir(NDSDirectory dir) { foreach (var child in dir.ChildrenDirectories) { SaveDir(child); } foreach (var child in dir.ChildrenFiles) { SaveFile(child); } } SaveDir(RootOverlayDirectory); SaveDir(RootDataDirectory); }