public void WriteToFile(string filePath)
{
using var fileStream = File.Open(filePath, FileMode.Create);
using var binaryWriter = new BinaryWriter(fileStream);
// Archive header
binaryWriter.Write(new[] { 'A', 'L', 'E', 'X' }); // Magic number
binaryWriter.Write(01); // Version maj
binaryWriter.Write(00); // Version min
for (int i = 0; i < 12; ++i)
{
binaryWriter.Write((byte)0);
}
// Archive directory
binaryWriter.Write(Files.Count);
List <long> fileLocOffsets = new List <long>();
foreach (var file in Files)
{
binaryWriter.Write(file.FileName); // Length-prefixed automatically
fileLocOffsets.Add(binaryWriter.BaseStream.Position);
binaryWriter.Write((long)00);
binaryWriter.Write((long)file.FileData.Length);
binaryWriter.Write((int)file.FileCompressionMethod);
for (int i = 0; i < 8; ++i)
{
binaryWriter.Write((byte)0);
}
}
// File data
for (int fileIndex = 0; fileIndex < Files.Count; fileIndex++)
{
FileArchiveFile file = Files[fileIndex];
var fileDataPos = binaryWriter.BaseStream.Position;
binaryWriter.BaseStream.Seek(fileLocOffsets[fileIndex], SeekOrigin.Begin);
binaryWriter.Write(fileDataPos);
binaryWriter.BaseStream.Seek(fileDataPos, SeekOrigin.Begin);;
for (int i = 0; i < 4; ++i)
{
binaryWriter.Write((byte)0);
}
if (file.FileCompressionMethod == CompressionMethod.None)
{
binaryWriter.Write(file.FileData);
}
else if (file.FileCompressionMethod == CompressionMethod.Zstd)
{
using var memoryStream = new MemoryStream();
using var compressStream = new ZstandardStream(memoryStream, System.IO.Compression.CompressionMode.Compress);
compressStream.CompressionLevel = 5;
compressStream.Write(file.FileData, 0, file.FileData.Length);
compressStream.Close();
var compressedData = memoryStream.ToArray();
binaryWriter.Write(compressedData);
}
for (int i = 0; i < 4; ++i)
{
binaryWriter.Write((byte)0);
}
}
}
public void AddFile(FileArchiveFile file)
{
throw new NotImplementedException();
}