public static void SetFileInfo(
this MountPathFile source,
FileInfo file,
long maxStreamLength = MaxStreamLength,
int maxSegmentLength = MaxSegmentLength)
{
using (var stream = file.Open(FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
using (var keystream = new MemoryStream())
using (var hash = SHA512.Create())
{
source.FileName = file.Name;
source.FilePath = file.DirectoryName;
source.Size = file.Length;
if (stream.Length <= maxStreamLength)
{
source.Hash = hash.ComputeHash(stream);
return;
}
var buffer = new byte[maxSegmentLength];
// Read the first segment of bytes and write to key stream.
stream.Read(buffer, 0, maxSegmentLength);
keystream.Write(buffer, 0, maxSegmentLength);
// Read the last segment of bytes and write to key stream.
var position = Math.Abs(stream.Length - maxSegmentLength);
stream.Position = position;
stream.Read(buffer, 0, maxSegmentLength);
keystream.Write(buffer, 0, maxSegmentLength);
source.Hash = hash.ComputeHash(keystream.Rewind());
}
}
public static MountPathFile CreateMountPathFile(this FileInfo fileinfo, Guid mountPathId)
{
var mountfile = new MountPathFile
{
MountPathId = mountPathId,
};
mountfile.SetFileInfo(fileinfo);
return(mountfile);
}
