public byte[] GetChecksum(string fileName, Guid md5HashGuid)
{
byte[] hashData = null;
if (HostFileManager != null)
{
object docData = HostFileManager.GetFileDocData(fileName);
IPersistFileCheckSum fileChecksummer = docData as IPersistFileCheckSum;
if (fileChecksummer != null)
{
byte[] tempBytes = new byte[1024];
int actualSize;
fileChecksummer.CalculateCheckSum(md5HashGuid, tempBytes.Length, tempBytes, out actualSize);
hashData = new byte[actualSize];
for (int i = 0; i < actualSize; i++)
{
hashData[i] = tempBytes[i];
}
}
}
if (hashData == null)
{
HashAlgorithm MD5cryptoProvider = new MD5CryptoServiceProvider();
using (Stream fileStream = File.OpenRead(fileName))
{
hashData = MD5cryptoProvider.ComputeHash(fileStream);
}
}
return(hashData);
}
public byte[] GetChecksum(string fileName, Guid hashGuid)
{
byte[] hashData = null;
if (HostFileManager != null)
{
object docData = HostFileManager.GetFileDocData(fileName);
IPersistFileCheckSum fileChecksummer = docData as IPersistFileCheckSum;
if (fileChecksummer != null)
{
byte[] tempBytes = new byte[1024];
int actualSize;
fileChecksummer.CalculateCheckSum(hashGuid, tempBytes.Length, tempBytes, out actualSize);
hashData = new byte[actualSize];
for (int i = 0; i < actualSize; i++)
{
hashData[i] = tempBytes[i];
}
}
}
if (hashData == null)
{
HashAlgorithm hashAlgorithm;
if (hashGuid == s_hashSHA256Guid)
{
hashAlgorithm = SHA256.Create();
}
else if (hashGuid == s_hashSHA1Guid)
{
hashAlgorithm = SHA1.Create();
}
else if (hashGuid == s_hashMD5Guid)
{
hashAlgorithm = MD5.Create();
}
else
{
hashAlgorithm = null;
}
if (hashAlgorithm != null)
{
using (Stream fileStream = File.OpenRead(fileName))
{
hashData = hashAlgorithm.ComputeHash(fileStream);
}
}
}
return(hashData);
}
