private void WriteFileTable(Stream output, IList <IArchiveFileInfo> files)
{
var crc16 = Crc16.X25;
var fileEntries = new List <GfsaFileEntry>();
var fileOffset = 0;
foreach (var fileGroup in OrderFiles(files).Cast <GfsaArchiveFileInfo>().GroupBy(x => x.FilePath.GetDirectory().ToRelative() + "/"))
{
var localGroup = fileGroup.Select(file =>
{
var entry = new GfsaFileEntry
{
hash = BinaryPrimitives.ReadUInt16BigEndian(crc16.Compute(Encoding.ASCII.GetBytes(file.FilePath.GetName()))),
Offset = fileOffset,
Size = (int)file.CompressedSize
};
fileOffset += (int)((file.CompressedSize + 3) & ~3);
return(entry);
});
fileEntries.AddRange(localGroup.OrderBy(x => x.hash));
}
XfsaSupport.WriteCompressedTableEntries(output, fileEntries);
while (output.Position % 4 > 0)
{
output.WriteByte(0);
}
}
private void WriteDirectoryTable(Stream output, IList <IArchiveFileInfo> files)
{
var crc16 = Crc16.X25;
var directoryEntries = new List <GfsaDirectoryEntry>();
var fileIndex = 0;
foreach (var group in OrderFiles(files).GroupBy(x => x.FilePath.GetDirectory().ToRelative() + "/"))
{
directoryEntries.Add(new GfsaDirectoryEntry
{
hash = BinaryPrimitives.ReadUInt16BigEndian(crc16.Compute(Encoding.ASCII.GetBytes(group.Key))),
fileIndex = fileIndex,
fileCount = (short)group.Count()
});
fileIndex += directoryEntries.Last().fileCount;
}
XfsaSupport.WriteCompressedTableEntries(output, directoryEntries.OrderBy(x => x.hash));
while (output.Position % 4 > 0)
{
output.WriteByte(0);
}
}
public void Save(Stream output, IList <IArchiveFileInfo> files, IProgressContext progress)
{
// Group files by directory
var castedFiles = files.Cast <XfsaArchiveFileInfo <Xfsa2FileEntry> >();
// Build directory, file, and name tables
BuildTables(castedFiles, out var directoryEntries, out var directoryHashes, out var fileEntries, out var nameStream);
// -- Write file --
using var bw = new BinaryWriterX(output);
bw.BaseStream.Position = _headerSize;
// Write directory entries
_header.directoryEntriesCount = (short)directoryEntries.Count;
_header.directoryEntriesOffset = _headerSize;
XfsaSupport.WriteCompressedTableEntries(bw.BaseStream, directoryEntries);
bw.WriteAlignment(4);
// Write directory hashes
_header.directoryHashCount = (short)directoryHashes.Count;
_header.directoryHashOffset = (int)bw.BaseStream.Position;
XfsaSupport.WriteCompressedTableEntries(bw.BaseStream, directoryHashes);
bw.WriteAlignment(4);
// Write file entry hashes
_header.fileEntriesCount = fileEntries.Count;
_header.fileEntriesOffset = (int)bw.BaseStream.Position;
XfsaSupport.WriteCompressedTableEntries(bw.BaseStream, fileEntries.Select(x => x.Entry));
bw.WriteAlignment(4);
// Write name table
_header.nameOffset = (int)bw.BaseStream.Position;
var nameStreamComp = new MemoryStream();
XfsaSupport.Compress(nameStream, nameStreamComp, Level5CompressionMethod.Lz10);
nameStreamComp.CopyTo(bw.BaseStream);
bw.WriteAlignment(4);
// Write file data
_header.dataOffset = (int)bw.BaseStream.Position;
foreach (var fileEntry in fileEntries)
{
bw.BaseStream.Position = _header.dataOffset + fileEntry.Entry.FileOffset;
fileEntry.SaveFileData(bw.BaseStream, null);
}
// Write header
bw.BaseStream.Position = 0;
bw.WriteType(_header);
}