private void MakeRomFSData(RomfsFile[] RomFiles, MemoryStream metadata)
{
TempFile = Path.GetRandomFileName();
Console.WriteLine("Computing IVFC Header Data...");
IVFCInfo ivfc = new IVFCInfo();
ivfc.Levels = new IVFCLevel[3];
for (int i = 0; i < ivfc.Levels.Length; i++)
{
ivfc.Levels[i] = new IVFCLevel();
ivfc.Levels[i].BlockSize = 0x1000;
}
ivfc.Levels[2].DataLength = RomfsFile.GetDataBlockLength(RomFiles, (ulong)metadata.Length);
ivfc.Levels[1].DataLength = (Align(ivfc.Levels[2].DataLength, ivfc.Levels[2].BlockSize) / ivfc.Levels[2].BlockSize) * 0x20; //0x20 per SHA256 hash
ivfc.Levels[0].DataLength = (Align(ivfc.Levels[1].DataLength, ivfc.Levels[1].BlockSize) / ivfc.Levels[1].BlockSize) * 0x20; //0x20 per SHA256 hash
ulong MasterHashLen = (Align(ivfc.Levels[0].DataLength, ivfc.Levels[0].BlockSize) / ivfc.Levels[0].BlockSize) * 0x20;
ulong lofs = 0;
for (int i = 0; i < ivfc.Levels.Length; i++)
{
ivfc.Levels[i].HashOffset = lofs;
lofs += Align(ivfc.Levels[i].DataLength, ivfc.Levels[i].BlockSize);
}
uint IVFC_MAGIC = 0x43465649; //IVFC
uint RESERVED = 0x0;
uint HeaderLen = 0x5C;
uint MEDIA_UNIT_SIZE = 0x200;
byte[] SuperBlockHash = new byte[0x20];
FileStream OutFileStream = new FileStream(TempFile, FileMode.Create, FileAccess.ReadWrite);
try
{
OutFileStream.Seek(0, SeekOrigin.Begin);
OutFileStream.Write(BitConverter.GetBytes(IVFC_MAGIC), 0, 0x4);
OutFileStream.Write(BitConverter.GetBytes(0x10000), 0, 0x4);
OutFileStream.Write(BitConverter.GetBytes(MasterHashLen), 0, 0x4);
for (int i = 0; i < ivfc.Levels.Length; i++)
{
OutFileStream.Write(BitConverter.GetBytes(ivfc.Levels[i].HashOffset), 0, 0x8);
OutFileStream.Write(BitConverter.GetBytes(ivfc.Levels[i].DataLength), 0, 0x8);
OutFileStream.Write(BitConverter.GetBytes((int)(Math.Log(ivfc.Levels[i].BlockSize, 2))), 0, 0x4);
OutFileStream.Write(BitConverter.GetBytes(RESERVED), 0, 0x4);
}
OutFileStream.Write(BitConverter.GetBytes(HeaderLen), 0, 0x4);
//IVFC Header is Written.
OutFileStream.Seek((long)Align(MasterHashLen + 0x60, ivfc.Levels[0].BlockSize), SeekOrigin.Begin);
byte[] metadataArray = metadata.ToArray();
OutFileStream.Write(metadataArray, 0, metadataArray.Length);
long baseOfs = OutFileStream.Position;
Console.WriteLine("Writing Level 2 Data...");
for (int i = 0; i < RomFiles.Length; i++)
{
OutFileStream.Seek((long)(baseOfs + (long)RomFiles[i].Offset), SeekOrigin.Begin);
using (FileStream inStream = new FileStream(RomFiles[i].FullName, FileMode.Open, FileAccess.Read))
{
while (inStream.Position < inStream.Length)
{
byte[] buffer = new byte[inStream.Length - inStream.Position > 0x100000 ? 0x100000 : inStream.Length - inStream.Position];
inStream.Read(buffer, 0, buffer.Length);
OutFileStream.Write(buffer, 0, buffer.Length);
}
}
}
long hashBaseOfs = (long)Align((ulong)OutFileStream.Position, ivfc.Levels[2].BlockSize);
long hOfs = (long)Align(MasterHashLen, ivfc.Levels[0].BlockSize);
long cOfs = hashBaseOfs + (long)ivfc.Levels[1].HashOffset;
SHA256Managed sha = new SHA256Managed();
for (int i = ivfc.Levels.Length - 1; i >= 0; i--)
{
Console.WriteLine("Computing Level " + i + " Hashes...");
byte[] buffer = new byte[(int)ivfc.Levels[i].BlockSize];
for (long ofs = 0; ofs < (long)ivfc.Levels[i].DataLength; ofs += ivfc.Levels[i].BlockSize)
{
OutFileStream.Seek(hOfs, SeekOrigin.Begin);
OutFileStream.Read(buffer, 0, (int)ivfc.Levels[i].BlockSize);
hOfs = OutFileStream.Position;
byte[] hash = sha.ComputeHash(buffer);
OutFileStream.Seek(cOfs, SeekOrigin.Begin);
OutFileStream.Write(hash, 0, hash.Length);
cOfs = OutFileStream.Position;
}
if (i == 2)
{
long len = OutFileStream.Position;
if (len % 0x1000 != 0)
{
len = (long)Align((ulong)len, 0x1000);
byte[] buf = new byte[len - OutFileStream.Position];
OutFileStream.Write(buf, 0, buf.Length);
}
}
if (i > 0)
{
hOfs = hashBaseOfs + (long)ivfc.Levels[i - 1].HashOffset;
if (i > 1)
{
cOfs = hashBaseOfs + (long)ivfc.Levels[i - 2].HashOffset;
}
else
{
cOfs = (long)Align(HeaderLen, PADDING_ALIGN);
}
}
}
OutFileStream.Seek(0, SeekOrigin.Begin);
uint SuperBlockLen = (uint)Align(MasterHashLen + 0x60, MEDIA_UNIT_SIZE);
byte[] MasterHashes = new byte[SuperBlockLen];
OutFileStream.Read(MasterHashes, 0, (int)SuperBlockLen);
SuperBlockHash = sha.ComputeHash(MasterHashes);
}
finally
{
if (OutFileStream != null)
OutFileStream.Dispose();
}
Console.WriteLine("RomFS Super Block Hash: " + ByteArrayToString(SuperBlockHash));
Console.WriteLine("Writing Binary to " + this.FileName + "...");
WriteBinary(TempFile, this.FileName);
}
public void Build()
{
FileNameTable fnt = new FileNameTable(this.RomFSDirectory);
RomfsFile[] romFiles = new RomfsFile[fnt.NumFiles];
LayoutManager.Input[] In = new LayoutManager.Input[fnt.NumFiles];
Console.WriteLine("\nCreating layout...");
for (int i = 0; i < fnt.NumFiles; i++)
{
In[i] = new LayoutManager.Input();
In[i].FilePath = fnt.NameEntryTable[i].FullName;
In[i].AlignmentSize = 0x10;
}
LayoutManager.Output[] Out = LayoutManager.Create(In);
for (int i = 0; i < Out.Length; i++)
{
romFiles[i] = new RomfsFile();
romFiles[i].Offset = Out[i].Offset;
romFiles[i].PathName = Out[i].FilePath.Replace(Path.GetFullPath(this.RomFSDirectory), "").Replace("\\", "/");
romFiles[i].FullName = Out[i].FilePath;
romFiles[i].Size = Out[i].Size;
}
using (MemoryStream memoryStream = new MemoryStream())
{
Console.WriteLine("Creating RomFS MetaData...");
MetaDataBuilder mdb = new MetaDataBuilder();
mdb.BuildRomFSHeader(memoryStream, romFiles, this.RomFSDirectory);
MakeRomFSData(romFiles, memoryStream);
}
}
public static ulong GetDataBlockLength(RomfsFile[] files, ulong PreData)
{
return (files.Length == 0) ? PreData : PreData + files[files.Length - 1].Offset + files[files.Length - 1].Size;
}
private void PopulateRomfs(Romfs_MetaData MetaData, RomfsFile[] Entries)
{
//Recursively Add All Directories to DirectoryTable
AddDir(MetaData, new DirectoryInfo(ROOT_DIR), 0, ROMFS_UNUSED_ENTRY);
//Iteratively Add All Files to FileTable
AddFiles(MetaData, Entries);
//Set HashKeyPointers, Build HashTables
PopulateHashTables(MetaData);
//Thats it.
}
private void AddFiles(Romfs_MetaData MetaData, RomfsFile[] Entries)
{
string PrevDirPath = "";
for (int i = 0; i < Entries.Length; i++)
{
FileInfo file = new FileInfo(Entries[i].FullName);
Romfs_FileEntry Entry = new Romfs_FileEntry();
string DirPath = Path.GetDirectoryName(Entries[i].FullName);
int ParentIndex = GetRomfsDirEntry(MetaData, DirPath);
Entry.FullName = Entries[i].FullName;
Entry.Offset = MetaData.FileTableLen;
Entry.ParentDirOffset = MetaData.DirTable.DirectoryTable[ParentIndex].Offset;
Entry.SiblingOffset = ROMFS_UNUSED_ENTRY;
if (DirPath == PrevDirPath)
{
MetaData.FileTable.FileTable[i - 1].SiblingOffset = Entry.Offset;
}
if (MetaData.DirTable.DirectoryTable[ParentIndex].FileOffset == ROMFS_UNUSED_ENTRY)
{
MetaData.DirTable.DirectoryTable[ParentIndex].FileOffset = Entry.Offset;
}
Entry.HashKeyPointer = ROMFS_UNUSED_ENTRY;
Entry.NameSize = (uint)file.Name.Length * 2;
Entry.Name = file.Name;
Entry.DataOffset = Entries[i].Offset;
Entry.DataSize = Entries[i].Size;
MetaData.FileTable.FileTable.Add(Entry);
MetaData.FileTableLen += 0x20 + (uint)Align((ulong)file.Name.Length * 2, 4);
PrevDirPath = DirPath;
}
}
public void BuildRomFSHeader(MemoryStream romfs_stream, RomfsFile[] Entries, string DIR)
{
ROOT_DIR = DIR;
Romfs_MetaData MetaData = new Romfs_MetaData();
InitializeMetaData(MetaData);
CalcRomfsSize(MetaData);
PopulateRomfs(MetaData, Entries);
WriteMetaDataToStream(MetaData, romfs_stream);
}
