Visible to Intel only — GUID: GUID-28F34EA8-6DC4-4F43-9881-C58B94A12394
Visible to Intel only — GUID: GUID-28F34EA8-6DC4-4F43-9881-C58B94A12394
CRC24a, CRC24b, CRC24c
Computes the CRC24 checksum for the source data buffer.
Syntax
IppStatus ippsCRC24a_8u(Ipp8u* pSrc, int len, Ipp32u* pCRC24);
IppStatus ippsCRC24b_8u(Ipp8u* pSrc, int len, Ipp32u* pCRC24);
IppStatus ippsCRC24c_8u(Ipp8u* pSrc, int len, Ipp32u* pCRC24);
IppStatus ippsCRC24a_1u(Ipp8u* pSrc, int srcBitOffset, Ipp8u* pDst, int dstBitOffset, int bitLen);
IppStatus ippsCRC24b_1u(Ipp8u* pSrc, int srcBitOffset, Ipp8u* pDst, int dstBitOffset, int bitLen);
IppStatus ippsCRC24c_1u(Ipp8u* pSrc, int srcBitOffset, Ipp8u* pDst, int dstBitOffset, int bitLen);
Include Files
ippe.h
Domain Dependencies
ippcore.h
Libraries
ippe.lib
Parameters
pSrc |
Pointer to the source data buffer. |
srcBitOffset |
Offset in bits from the source data buffer. |
pDst |
Pointer to the destination data buffer. |
dstBitOffset |
Offset in bits from the destination data buffer. |
len |
Number of elements in the source data buffer. |
pCRC24 |
Pointer to the checksum value. |
bitLen |
Length of the input source vector, in bits. |
Description
These functions compute the checksum for srcLen elements of the source data buffer pSrc using different polynomials and store it in the pCRC24 respectively. The following polynomial representations are used:
- ippsCRC24a
-
X24 + X23 + X18 + X17 + X14 + X11 + X10 + X7 + X6 + X5 + X4 + X3 + X + 1
- ippsCRC24b
-
X24 + X23 + X6 + X5 + X + 1
- ippsCRC24c
-
X24 + X23 + X21 + X20 + X17 + X15 + X13 + X12 + X8 + X4 + X2 + X + 1
These functions can be used to compute the accumulated value of the checksum for multiple buffers in the data stream by specifying as an input parameter the checksum value obtained in the preceding function call.
ippsCRC24{a|b|c}_1u. These function flavors compute the checksum of vectors that have a 8u data type. It means that each byte consists of eight consecutive elements of the vector (1 bit per element). You need to specify the offsets from the source and destination vectors in the srcBitOffset and dstBitOffset parameters, respectively.
Return Values
ippStsNoErr |
Indicates no error. |
ippStsNullPtrErr |
Indicates an error if the pSrc pointer is NULL. |
ippStsSizeErr |
Indicates an error if the length of the source vector is less than or equal to 0. |