/// <summary>
/// Retrieve the NeathCheckSum Definition of the File.
/// NeathCheckSum Compare the length and starting 1024 bytes
/// and lastest 1024 bytes as well.
/// </summary>
/// <param name="finfo"></param>
/// <returns></returns>
private static string NeathCheckSum(Alphaleonis.Win32.Filesystem.FileInfo finfo)
{
int bytesCount = 1024;
int totalBytes = bytesCount * 2;
byte[] buffer = new byte[bytesCount];
byte[] start = new byte[bytesCount];
byte[] end = new byte[bytesCount];
if (finfo.Length <= totalBytes)
{
using (FileStream fs = finfo.OpenRead())
{
fs.Read(buffer, 0, bytesCount);
return(BitConverter.ToString(buffer, 0));
}
}
else
{
using (FileStream fs = finfo.OpenRead())
{
fs.Read(start, 0, bytesCount);
fs.Position = finfo.Length - bytesCount;
fs.Read(end, 0, bytesCount);
return(BitConverter.ToString(start, 0) + BitConverter.ToString(end, 0));
}
}
}
public static string GetHash(this Alphaleonis.Win32.Filesystem.FileInfo file, HashAlgorithms algorithm)
{
byte[] hash = null;
using (var fileStream = file.OpenRead())
{
switch (algorithm)
{
case HashAlgorithms.MD5:
hash = System.Security.Cryptography.MD5.Create().ComputeHash(fileStream);
break;
case HashAlgorithms.SHA1:
hash = System.Security.Cryptography.SHA1.Create().ComputeHash(fileStream);
break;
case HashAlgorithms.SHA256:
hash = System.Security.Cryptography.SHA256.Create().ComputeHash(fileStream);
break;
case HashAlgorithms.SHA384:
hash = System.Security.Cryptography.SHA384.Create().ComputeHash(fileStream);
break;
case HashAlgorithms.SHA512:
hash = System.Security.Cryptography.SHA512.Create().ComputeHash(fileStream);
break;
case HashAlgorithms.MACTripleDES:
hash = System.Security.Cryptography.MACTripleDES.Create().ComputeHash(fileStream);
break;
case HashAlgorithms.RIPEMD160:
hash = System.Security.Cryptography.RIPEMD160.Create().ComputeHash(fileStream);
break;
}
fileStream.Close();
}
var sb = new StringBuilder(hash.Length);
for (var i = 0; i < hash.Length; i++)
{
sb.Append(hash[i].ToString("X2"));
}
return(sb.ToString());
}
public override Stream OpenRead()
{
return(instance.OpenRead());
}
