void ReadMetadata()
{
// Open
Magic = _r.ReadUInt32();
if (Magic == F4_BSAHEADER_FILEID)
{
Version = _r.ReadUInt32();
if (Version != F4_BSAHEADER_VERSION)
{
throw new InvalidOperationException("BAD MAGIC");
}
// Read the header
var header_Type = _r.ReadASCIIString(4); // 08 GNRL=General, DX10=Textures
var header_NumFiles = _r.ReadUInt32(); // 0C
var header_NameTableOffset = _r.ReadUInt64(); // 10 - relative to start of file
// Create file metadatas
_r.Position = (long)header_NameTableOffset;
_files = new FileMetadata[header_NumFiles];
for (var i = 0; i < header_NumFiles; i++)
{
var length = _r.ReadUInt16();
var path = _r.ReadASCIIString(length).Replace('\\', '/');
_files[i] = new FileMetadata
{
Path = path,
PathHash = Tes4HashFilePath(path),
};
}
if (header_Type == "GNRL") // General BA2 Format
{
_r.Position = 16 + 8; // sizeof(header) + 8
for (var i = 0; i < header_NumFiles; i++)
{
var info_NameHash = _r.ReadUInt32(); // 00
var info_Ext = _r.ReadASCIIString(4); // 04 - extension
var info_DirHash = _r.ReadUInt32(); // 08
var info_Unk0C = _r.ReadUInt32(); // 0C - flags? 00100100
var info_Offset = _r.ReadUInt64(); // 10 - relative to start of file
var info_PackedSize = _r.ReadUInt32(); // 18 - packed length (zlib)
var info_UnpackedSize = _r.ReadUInt32(); // 1C - unpacked length
var info_Unk20 = _r.ReadUInt32(); // 20 - BAADF00D
_files[i].PackedSize = info_PackedSize;
_files[i].UnpackedSize = info_UnpackedSize;
_files[i].Offset = (long)info_Offset;
}
}
else if (header_Type == "DX10") // Texture BA2 Format
{
_r.Position = 16 + 8; // sizeof(header) + 8
for (var i = 0; i < header_NumFiles; i++)
{
var fileMetadata = _files[i];
var info_NameHash = _r.ReadUInt32(); // 00
var info_Ext = _r.ReadASCIIString(4); // 04
var info_DirHash = _r.ReadUInt32(); // 08
var info_Unk0C = _r.ReadByte(); // 0C
var info_NumChunks = _r.ReadByte(); // 0D
var info_ChunkHeaderSize = _r.ReadUInt16(); // 0E - size of one chunk header
var info_Height = _r.ReadUInt16(); // 10
var info_Width = _r.ReadUInt16(); // 12
var info_NumMips = _r.ReadByte(); // 14
var info_Format = _r.ReadByte(); // 15 - DXGI_FORMAT
var info_Unk16 = _r.ReadUInt16(); // 16 - 0800
// read tex-chunks
var texChunks = new F4TexChunk[info_NumChunks];
for (var j = 0; j < info_NumChunks; j++)
{
texChunks[j] = new F4TexChunk
{
Offset = _r.ReadUInt64(), // 00
PackedSize = _r.ReadUInt32(), // 08
UnpackedSize = _r.ReadUInt32(), // 0C
StartMip = _r.ReadUInt16(), // 10
EndMip = _r.ReadUInt16(), // 12
Unk14 = _r.ReadUInt32(), // 14 - BAADFOOD
}
}
;
var firstChunk = texChunks[0];
_files[i].PackedSize = firstChunk.PackedSize;
_files[i].UnpackedSize = firstChunk.UnpackedSize;
_files[i].Offset = (long)firstChunk.Offset;
fileMetadata.Tex = new F4Tex
{
Height = info_Height,
Width = info_Width,
NumMips = info_NumMips,
Format = (DXGIFormat)info_Format,
Unk16 = info_Unk16,
Chunks = texChunks,
};
}
}
}
else if (Magic == OB_BSAHEADER_FILEID)
{
Version = _r.ReadUInt32();
if (Version != OB_BSAHEADER_VERSION && Version != F3_BSAHEADER_VERSION && Version != SSE_BSAHEADER_VERSION)
{
throw new InvalidOperationException("BAD MAGIC");
}
// Read the header
var header_FolderRecordOffset = _r.ReadUInt32(); // Offset of beginning of folder records
var header_ArchiveFlags = _r.ReadUInt32(); // Archive flags
var header_FolderCount = _r.ReadUInt32(); // Total number of folder records (OBBSAFolderInfo)
var header_FileCount = _r.ReadUInt32(); // Total number of file records (OBBSAFileInfo)
var header_FolderNameLength = _r.ReadUInt32(); // Total length of folder names
var header_FileNameLength = _r.ReadUInt32(); // Total length of file names
var header_FileFlags = _r.ReadUInt32(); // File flags
// Calculate some useful values
if ((header_ArchiveFlags & OB_BSAARCHIVE_PATHNAMES) == 0 || (header_ArchiveFlags & OB_BSAARCHIVE_FILENAMES) == 0)
{
throw new InvalidOperationException("HEADER FLAGS");
}
_compressToggle = (header_ArchiveFlags & OB_BSAARCHIVE_COMPRESSFILES) != 0;
if (Version == F3_BSAHEADER_VERSION || Version == SSE_BSAHEADER_VERSION)
{
_hasNamePrefix = (header_ArchiveFlags & F3_BSAARCHIVE_PREFIXFULLFILENAMES) != 0;
}
var folderSize = Version != SSE_BSAHEADER_VERSION ? 16 : 24;
// Create file metadatas
_files = new FileMetadata[header_FileCount];
var filenamesSectionStartPos = _r.Position = header_FolderRecordOffset + header_FolderNameLength + header_FolderCount * (folderSize + 1) + header_FileCount * 16;
var buf = new List <byte>(64);
for (var i = 0; i < header_FileCount; i++)
{
buf.Clear();
byte curCharAsByte; while ((curCharAsByte = _r.ReadByte()) != 0)
{
buf.Add(curCharAsByte);
}
var path = Encoding.ASCII.GetString(buf.ToArray()).Replace('\\', '/');
_files[i] = new FileMetadata
{
Path = path,
};
}
if (_r.Position != filenamesSectionStartPos + header_FileNameLength)
{
throw new InvalidOperationException("HEADER FILENAMES");
}
// read-all folders
_r.Position = header_FolderRecordOffset;
var foldersFiles = new uint[header_FolderCount];
for (var i = 0; i < header_FolderCount; i++)
{
var folder_Hash = _r.ReadUInt64(); // Hash of the folder name
var folder_FileCount = _r.ReadUInt32(); // Number of files in folder
var folder_Unk = 0U; var folder_Offset = 0UL;
if (Version == SSE_BSAHEADER_VERSION)
{
folder_Unk = _r.ReadUInt32(); folder_Offset = _r.ReadUInt64();
}
else
{
folder_Offset = _r.ReadUInt32();
}
foldersFiles[i] = folder_FileCount;
}
// add file
var fileNameIndex = 0U;
for (var i = 0; i < header_FolderCount; i++)
{
var folder_name = _r.ReadASCIIString(_r.ReadByte(), ASCIIFormat.PossiblyNullTerminated).Replace('\\', '/'); // BSAReadSizedString
var folderFiles = foldersFiles[i];
for (var j = 0; j < folderFiles; j++)
{
var file_Hash = _r.ReadUInt64(); // Hash of the filename
var file_SizeFlags = _r.ReadUInt32(); // Size of the data, possibly with OB_BSAFILE_FLAG_COMPRESS set
var file_Offset = _r.ReadUInt32(); // Offset to raw file data
var fileMetadata = _files[fileNameIndex++];
fileMetadata.SizeFlags = file_SizeFlags;
fileMetadata.Offset = file_Offset;
fileMetadata.Path = folder_name + "/" + fileMetadata.Path;
fileMetadata.PathHash = Tes4HashFilePath(fileMetadata.Path);
}
}
}
else if (Magic == MW_BSAHEADER_FILEID)
{
// Read the header
var header_HashOffset = _r.ReadUInt32(); // Offset of hash table minus header size (12)
var header_FileCount = _r.ReadUInt32(); // Number of files in the archive
// Calculate some useful values
var headerSize = _r.Position;
var hashTablePosition = headerSize + header_HashOffset;
var fileDataSectionPostion = hashTablePosition + (8 * header_FileCount);
// Create file metadatas
_files = new FileMetadata[header_FileCount];
for (var i = 0; i < header_FileCount; i++)
{
_files[i] = new FileMetadata
{
// Read file sizes/offsets
SizeFlags = _r.ReadUInt32(),
Offset = fileDataSectionPostion + _r.ReadUInt32(),
}
}
;
// Read filename offsets
var filenameOffsets = new uint[header_FileCount]; // relative offset in filenames section
for (var i = 0; i < header_FileCount; i++)
{
filenameOffsets[i] = _r.ReadUInt32();
}
// Read filenames
var filenamesSectionStartPos = _r.Position;
var buf = new List <byte>(64);
for (var i = 0; i < header_FileCount; i++)
{
_r.Position = filenamesSectionStartPos + filenameOffsets[i];
buf.Clear();
byte curCharAsByte; while ((curCharAsByte = _r.ReadByte()) != 0)
{
buf.Add(curCharAsByte);
}
_files[i].Path = Encoding.ASCII.GetString(buf.ToArray()).Replace('\\', '/');
}
// Read filename hashes
_r.Position = hashTablePosition;
for (var i = 0; i < header_FileCount; i++)
{
//_files[i].PathHash = _r.ReadUInt64();
_files[i].PathHash = Tes3HashFilePath(_files[i].Path);
}
}
else
{
throw new InvalidOperationException("BAD MAGIC");
}
// Create the file metadata hash table
_filesByHash = _files.ToLookup(x => x.PathHash);
}
ulong HashFilePath(string filePath)
{
if (Magic == MW_BSAHEADER_FILEID)
{
return(Tes3HashFilePath(filePath));
}
else
{
return(Tes4HashFilePath(filePath));
}
}
