Description
The CalculateChecksum method computes an Adler-32
or CRC
checksum on a block of data. If you are dealing with streaming
data, this method can also be used to compute a running checksum. It is provided as a convenience feature for developers that need to calculate a checksum on data without compressing it at all.
Parameters
| Parameter |
Description |
| vaData |
The data to compute a checksum for. |
| ChecksumType |
Selects the type of checksum. Specify cctCRC32 to have the library compute a CRC-32 checksum. Specify cctAdler32 for an Adler-32 checksum. |
| lPreviousChecksum |
Specify 0 if this is the first (or the only) block of data you want to compute a checksum for. If you are dealing with streaming data and have already computed the checksum for previous data, specify the previously returned checksum so that it can be updated. |
Return value
Returns the computed checksum.
| Declaration (DXceedStreamingCompression) |
 Copy Code |
HRESULT CalculateChecksum
(
[in] VARIANT* vaData,
[in] EXCChecksumType ChecksumType,
[in] long lPreviousChecksum,
[out, retval] long* lNewChecksum
) |
| Declaration (IXceedStreamingCompression) |
Copy Code |
HRESULT CalculateChecksum
(
[in, size_is(dwDataSize)] BYTE* pcData,
[in] DWORD dwDataSize,
[in] EXCChecksumType,
[in] DWORD dwPreviousCRC,
[out] DWORD* pdwNewCRC
) |