public void Append(string path, string vfsPath, bool compress, byte[] content)
{
if (_inputStream != null)
{
throw new Exception("Tried to add CRAF entry while still in read mode");
}
if (IndexOf(vfsPath) != -1)
{
throw new Exception("Tried to add file to CRAF with same path as existing file");
}
var entry = new CrafEntry();
entry.path = path;
entry.vfsPath = vfsPath;
entry.flags = compress ? (uint)2 : 0;
_files.Add(entry);
Replace(_files.Count - 1, content);
}
private void ReadMetadata()
{
if (_inputStream is null)
{
throw new Exception("Tried to read CRAF metadata after reader was closed");
}
using (BinaryReader bin = new BinaryReader(_inputStream, Encoding.Default, true))
{
_inputStream.Seek(4, SeekOrigin.Begin);
_versionMinor = bin.ReadUInt16();
_versionMajor = bin.ReadByte();
_metadataEncryption = bin.ReadByte();
var fileCount = bin.ReadInt32();
_files = new List <CrafEntry>(fileCount);
_unk0 = bin.ReadUInt32();
uint firstEntryOffset = bin.ReadUInt32();
_inputStream.Seek(0x20, SeekOrigin.Begin);
_flags = bin.ReadUInt32();
_unk1 = bin.ReadBytes(4);
_archiveKey = bin.ReadInt64();
_unk2 = bin.ReadBytes(16);
Int64 rollingKey = MasterArchiveKey ^ _archiveKey;
_inputStream.Seek(firstEntryOffset, SeekOrigin.Begin);
for (var i = 0; i < fileCount; i++)
{
var entry = new CrafEntry();
entry.entryKey = bin.ReadInt64();
entry.uncompressedSize = bin.ReadInt32();
entry.totalCompressedSize = bin.ReadInt32();
entry.flags = bin.ReadUInt32();
uint vfsPathOffset = bin.ReadUInt32();
entry.dataOffset = bin.ReadInt64();
uint pathOffset = bin.ReadUInt32();
entry.unk0 = bin.ReadUInt16();
entry.chunkKey = bin.ReadUInt16();
long entryEnd = _inputStream.Position;
_inputStream.Seek(vfsPathOffset, SeekOrigin.Begin);
entry.vfsPath = bin.ReadNullTerminatedString();
_inputStream.Seek(pathOffset, SeekOrigin.Begin);
entry.path = bin.ReadNullTerminatedString();
_inputStream.Seek(entryEnd, SeekOrigin.Begin);
_files.Add(entry);
if (MetadataEncrypted)
{
Int64 fileSizeKey = (rollingKey * MasterEntryKey) ^ entry.entryKey;
int uncompressedSizeKey = (int)(fileSizeKey >> 32);
int compressedSizeKey = (int)(fileSizeKey & 0xFFFFFFFF);
entry.uncompressedSize ^= uncompressedSizeKey;
entry.totalCompressedSize ^= compressedSizeKey;
Int64 dataOffsetKey = (fileSizeKey * MasterEntryKey) ^ ~(entry.entryKey);
entry.dataOffset ^= dataOffsetKey;
rollingKey = dataOffsetKey;
}
if (entry.UseDataEncryption)
{
var pos = _inputStream.Position;
_inputStream.Seek(entry.dataOffset + entry.totalCompressedSize - 0x21, SeekOrigin.Begin);
entry.IV = bin.ReadBytes(16);
_inputStream.Seek(pos, SeekOrigin.Begin);
}
}
}
}
