public Container(byte[] data)
{
var reader = new SpanReader(data);
var compressionType = (CompressionType)reader.ReadByte();
var length = reader.ReadInt32BigEndian();
// TODO check if valid compression type
// TODO xtea decrypt
var uncompressedLength = compressionType == CompressionType.None ? length : reader.ReadInt32BigEndian();
Data = compressionType switch
{
CompressionType.None => reader.ReadSlice(length).ToArray(),
CompressionType.Bzip2 =>
CompressionHelper.DecompressBzip2(reader.ReadSlice(length), uncompressedLength),
CompressionType.Gzip => CompressionHelper.DecompressGzip(reader.ReadSlice(length), uncompressedLength),
_ => throw new ArgumentException($"Invalid compression type of {compressionType}.")
};
}
public static ReferenceTable Decode(byte[] data)
{
var reader = new SpanReader(data);
var format = reader.ReadByte();
if (format < FormatVersion || format > FormatVersionSmart)
{
throw new ArgumentException($"Unknown reference table format of {format} given.");
}
var version = format >= FormatVersion?reader.ReadInt32BigEndian() : 0;
var flags = reader.ReadByte();
var hasNames = (flags & FlagNameHashes) != 0;
var hasWhirlpool = (flags & FlagWhirlpool) != 0;
var hasUnknown4 = (flags & FlagUnknown4) != 0;
var hasUnknown8 = (flags & FlagUnknown8) != 0;
var entryCount = format >= FormatVersionSmart
? reader.ReadUIntSmartBigEndian()
: reader.ReadUInt16BigEndian();
var entries = new Archive[entryCount];
// create the Archive objects
var lastEntryId = 0;
for (var i = 0; i < entries.Length; i++)
{
var id = lastEntryId += format >= FormatVersionSmart
? reader.ReadUIntSmartBigEndian()
: reader.ReadUInt16BigEndian();
entries[i] = new Archive(id);
}
// if the reference table has identifiers, read them
if (hasNames)
{
for (var i = 0; i < entryCount; i++)
{
entries[i].NameHash = reader.ReadInt32BigEndian();
}
}
// read the checksums
for (var i = 0; i < entryCount; i++)
{
entries[i].Crc = reader.ReadInt32BigEndian();
}
// TODO identify this
if (hasUnknown8)
{
for (var i = 0; i < entryCount; i++)
{
reader.ReadInt32BigEndian();
}
}
// read the whirlpool digests
if (hasWhirlpool)
{
for (var i = 0; i < entryCount; i++)
{
var whirlpoolSlice = reader.ReadSlice(WhirlpoolDigestLength);
entries[i].WhirlpoolDigest = whirlpoolSlice.ToArray();
}
}
// TODO identify this
if (hasUnknown4)
{
for (var i = 0; i < entryCount; i++)
{
reader.ReadInt32BigEndian();
reader.ReadInt32BigEndian();
}
}
// read the entry versions
for (var i = 0; i < entryCount; i++)
{
entries[i].Version = reader.ReadInt32BigEndian();
}
// create our child entries
for (var i = 0; i < entryCount; i++)
{
var count = format >= FormatVersionSmart
? reader.ReadUIntSmartBigEndian()
: reader.ReadUInt16BigEndian();
var entry = entries[i];
entry.Files = new ArchiveFile[count];
}
// read the child entry ids
for (var i = 0; i < entryCount; i++)
{
var childEntries = entries[i].Files;
var childEntriesLength = childEntries.Length;
var lastChildEntryId = 0;
for (var j = 0; j < childEntriesLength; j++)
{
var id = lastChildEntryId += format >= FormatVersionSmart
? reader.ReadUIntSmartBigEndian()
: reader.ReadUInt16BigEndian();
var childEntry = childEntries[j];
childEntry.Id = id;
}
}
// if the child entries have identifiers, read them
if (hasNames)
{
for (var i = 0; i < entryCount; i++)
{
var childEntries = entries[i].Files;
var childEntriesLength = childEntries.Length;
for (var j = 0; j < childEntriesLength; j++)
{
var identifier = reader.ReadInt32BigEndian();
var childEntry = childEntries[j];
childEntry.NameHash = identifier;
}
}
}
return(new ReferenceTable(format, version, entries));
}
