protected override byte[] HashFinal()
{
h1 ^= length;
h2 ^= length;
h1 += h2;
h2 += h1;
h1 = Murmur3a.MixFinal(h1);
h2 = Murmur3a.MixFinal(h2);
h1 += h2;
h2 += h1;
var hash = new byte[Murmur3a.READ_SIZE];
Array.Copy(BitConverter.GetBytes(h1), 0, hash, 0, 8);
Array.Copy(BitConverter.GetBytes(h2), 0, hash, 8, 8);
return(hash);
}
/// <summary>
/// Populates the OutputColumn class with all the required information to generate Hash's.
/// </summary>
/// <param name="bufferManager">The buffermanager that is affected by this</param>
/// <param name="output">The output to find the column in</param>
/// <param name="input">The input where all the data comes from</param>
/// <param name="outputColumnIndex">The Column Index of the output column.</param>
public void AddColumnInformation(IDTSBufferManager bufferManager, IDTSOutput output, IDTSInput input, int outputColumnIndex)
{
if (bufferManager == null)
{
throw new ArgumentNullException("bufferManager");
}
if (input == null)
{
throw new ArgumentNullException("input");
}
if (output == null)
{
throw new ArgumentNullException("output");
}
IDTSOutputColumn outputColumn = output.OutputColumnCollection[outputColumnIndex];
string[] inputLineageIDList;
inputLineageIDList = outputColumn.CustomPropertyCollection[Utility.InputColumnLineagePropName].Value.ToString().Split(',');
this.outputHashType = (MultipleHash.HashTypeEnumerator)outputColumn.CustomPropertyCollection[Utility.HashTypePropName].Value;
this.outputDataType = (MultipleHash.OutputTypeEnumerator)outputColumn.CustomPropertyCollection[Utility.OutputColumnOutputTypePropName].Value;
switch (this.outputHashType)
{
case MultipleHash.HashTypeEnumerator.None:
break;
case MultipleHash.HashTypeEnumerator.MD5:
this.hashMD5 = MD5.Create();
break;
case MultipleHash.HashTypeEnumerator.RipeMD160:
this.hashRipeMD160 = RIPEMD160.Create();
break;
case MultipleHash.HashTypeEnumerator.SHA1:
this.hashSHA1 = SHA1.Create();
break;
case MultipleHash.HashTypeEnumerator.SHA256:
this.hashSHA256 = SHA256.Create();
break;
case MultipleHash.HashTypeEnumerator.SHA384:
this.hashSHA384 = SHA384.Create();
break;
case MultipleHash.HashTypeEnumerator.SHA512:
this.hashSHA512 = SHA512.Create();
break;
case MultipleHash.HashTypeEnumerator.CRC32:
this.hashCRC32 = CRC32.Create();
break;
case MultipleHash.HashTypeEnumerator.CRC32C:
this.hashCRC32C = CRC32C.Create();
break;
case MultipleHash.HashTypeEnumerator.FNV1a32:
this.hashFNV1a32 = FNV1a32.Create();
break;
case MultipleHash.HashTypeEnumerator.FNV1a64:
this.hashFNV1a64 = FNV1a64.Create();
break;
case MultipleHash.HashTypeEnumerator.MurmurHash3a:
//ToDo: Call the MurmurHash
this.hashMurmur3a = Murmur3a.Create();
break;
case MultipleHash.HashTypeEnumerator.xxHash:
// todo: call the xxHash
this.hashxxHash = xxHash.Create();
break;
default:
break;
}
// Store all the input column ID's for the column's to be Hashed
int inputColumnLineageID;
foreach (string inputLineageID in inputLineageIDList)
{
int columnId = System.Convert.ToInt32(inputLineageID.Substring(1));
Microsoft.SqlServer.Dts.Pipeline.Wrapper.DTP_BUFFCOL columnData = new Microsoft.SqlServer.Dts.Pipeline.Wrapper.DTP_BUFFCOL();
inputColumnLineageID = bufferManager.FindColumnByLineageID(input.Buffer, columnId); // Strip the # from the ID
bufferManager.GetColumnInfo(input.Buffer, inputColumnLineageID, ref columnData);
MHashColumnInformation inputColumn = new MHashColumnInformation(inputColumnLineageID, columnData.DataType);
this.inputColumnDetails.Add(inputColumn);
}
// Store the Column ID for the Output Column
this.outputColumnID = bufferManager.FindColumnByLineageID(input.Buffer, outputColumn.LineageID);
}