public void WriteToFile(BinaryWriter bw)
{
bw.Write((byte)0);
using (var file = File.OpenRead(Filename))
{
bw.Write((int)file.Length);
bw.Write(CRC32.CalculateChecksumStream(file));
file.Position = 0;
file.CopyTo(bw.BaseStream);
}
}
public static void BuildPatchfile(string newDir, string oldDir, string outputFile, params IPatchedFile[] files)
{
using (var fs = File.Open(outputFile, FileMode.Create))
using (var totalFileInMem = new MemoryStream())
using (var bw = new BinaryWriter(totalFileInMem))
{
bw.Write(Encoding.ASCII.GetBytes("WzPatch\x1A")); // 8
bw.Write((int)2); // Version?, 12
var checksumOffset = bw.BaseStream.Position;
bw.Write((int)0); // Checksum, 16
using (var compressedSubBlob = new MemoryStream())
using (var ds = new ZOutputStream(compressedSubBlob, 6))
using (var bw_ms = new BinaryWriter(ds))
//using (var zs = new GZipStream(compressedSubBlob, CompressionLevel.Optimal))
//using (var bw_ms = new BinaryWriter(zs))
{
foreach (var filePatchLogic in files)
{
var fn = filePatchLogic.Filename.Replace(newDir, "").Replace(oldDir, "").Substring(1);
bw_ms.Write(fn.ToCharArray());
Console.WriteLine("Writing patch step of {0} ({1})", fn, filePatchLogic);
filePatchLogic.WriteToFile(bw_ms);
}
bw_ms.Flush();
//zs.Flush();
ds.Finish();
Console.WriteLine("Compressed data, flushing to main stream...");
compressedSubBlob.WriteTo(totalFileInMem);
}
Console.WriteLine("All done, just working on CRC...");
bw.BaseStream.Position = checksumOffset + 4;
var checksum = CRC32.CalculateChecksumStream(totalFileInMem);
bw.BaseStream.Position = checksumOffset;
bw.Write(checksum);
Console.WriteLine("Flushing to file...");
// Copy it over to the file
totalFileInMem.WriteTo(fs);
}
}