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Applies to: ~>1.0
TPJMD5 uses a buffer when reading data from a stream or a file. By default the buffer has the size specified by the TPJMD5.DefReadBufferSize constant. You can change the buffer size by setting the TPJMD5.ReadBufferSize property.
Here’s an example function that gets the MD5 hash of a file using a specified buffer size:
function MD5OfFile(const FileName: string; const BufSize: Integer): TPJMD5Digest; var MD5: TPJMD5; begin MD5 := TPJMD5.Create; try MD5.ReadBufferSize := BufSize; MD5.ProcessFile(FileName); Result := MD5.Digest; finally MD5.Free; end; end;
And here’s a similar function that uses one of the TStream overloads of TPJMD5.Process to get the MD5 hash of the whole of a stream using a given buffer size:
function MD5OfStream(const Stm: TStream; const BufSize: Integer): TPJMD5Digest; var MD5: TPJMD5; begin MD5 := TPJMD5.Create; try MD5.ReadBufferSize := BufSize; Stm.Position := 0; MD5.Process(Stm); Result := MD5.Digest; finally MD5.Free; end; end;
Because you need a TPJMD5 instance in order to access the TPJMD5.ReadBufferSize property you can’t change the buffer size when using the TPJMD5.CalculateFile class method or the TStream overload of TPJMD5.Calculate.