public static async ValueTask <IBSAReader> OpenRead(AbsolutePath filename)
{
return(await BSASignatures.MatchesAsync(filename) switch
{
Definitions.FileType.TES3 => await TES3Reader.Load(new NativeFileStreamFactory(filename)),
Definitions.FileType.BSA => await BSAReader.LoadAsync(new NativeFileStreamFactory(filename)),
Definitions.FileType.BA2 => await BA2Reader.Load(new NativeFileStreamFactory(filename)),
_ => throw new InvalidDataException("Filename is not a .bsa or .ba2")
});
public static async ValueTask <TES3Reader> Load(IStreamFactory factory)
{
await using var fs = await factory.GetStream();
using var br = new BinaryReader(fs);
var rdr = new TES3Reader
{
_streamFactory = factory,
_versionNumber = br.ReadUInt32(),
_hashTableOffset = br.ReadUInt32(),
_fileCount = br.ReadUInt32()
};
rdr._files = new TES3FileEntry[rdr._fileCount];
for (int i = 0; i < rdr._fileCount; i++)
{
var file = new TES3FileEntry {
Index = i,
Archive = rdr,
Size = br.ReadUInt32(),
Offset = br.ReadUInt32()
};
rdr._files[i] = file;
}
for (int i = 0; i < rdr._fileCount; i++)
{
rdr._files[i].NameOffset = br.ReadUInt32();
}
var origPos = br.BaseStream.Position;
for (int i = 0; i < rdr._fileCount; i++)
{
br.BaseStream.Position = origPos + rdr._files[i].NameOffset;
rdr._files[i].Path = new RelativePath(br.ReadStringTerm(VersionType.TES3));
}
br.BaseStream.Position = rdr._hashTableOffset + 12;
for (int i = 0; i < rdr._fileCount; i++)
{
rdr._files[i].Hash1 = br.ReadUInt32();
rdr._files[i].Hash2 = br.ReadUInt32();
}
rdr._dataOffset = br.BaseStream.Position;
return(rdr);
}
public static async ValueTask <IBSAReader> OpenRead(AbsolutePath filename)
{
var fourcc = "";
using (var file = await filename.OpenRead())
{
fourcc = Encoding.ASCII.GetString(new BinaryReader(file).ReadBytes(4));
}
if (fourcc == TES3Reader.TES3_MAGIC)
{
return(await TES3Reader.Load(filename));
}
if (fourcc == "BSA\0")
{
return(await BSAReader.Load(filename));
}
if (fourcc == "BTDX")
{
return(await BA2Reader.Load(filename));
}
throw new InvalidDataException("Filename is not a .bsa or .ba2, magic " + fourcc);
}