Intel® Integrated Performance Primitives (Intel® IPP) Developer Guide and Reference
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BWTInv
Performs the inverse BWT transform.
Syntax
IppStatus ippsBWTInv_8u(const Ipp8u* pSrc, Ipp8u* pDst, int len, int index, Ipp8u* pBWTInvBuff);
Include Files
ippdc.h
Domain Dependencies
Headers: ippcore.h, ippvm.h, ipps.h
Libraries: ippcore.lib, ippvm.lib, ipps.lib
Parameters
pSrc |
Pointer to the source vector. |
pDst |
Pointer to the destination vector. |
len |
Number of elements in the source and destination vectors. |
index |
Index of first position for the inverse BWT transform. |
pBWTInvBuff |
Pointer to the additional buffer. |
Description
This function performs the inverse BWT transform of len elements starting from pIndex element of the source vector pSrc and stores result in the vector pDst. The function uses the external buffer pBWTInvBuff. The size of this buffer must be computed by calling the function ippsBWTInvGetSize beforehand.
Return Values
ippStsNoErr |
Indicates no error. |
ippStsNullPtrErr |
Indicates an error if one of the specified pointers is NULL. |
ippStsSizeErr |
Indicates an error if len is less than or equal to 0. |
Example
The code example below shows how to use the function ippsBWTInv_8u.
void func_BWT() { int wndSize = 8; int pBWTFwdBuffSize; int pBWTInvBuffSize; Ipp8u pSrc[] = "baadeffg"; int len = 8; int pIndex; Ipp8u* pDst = ippsMalloc_8u(len); Ipp8u* pDstInv = ippsMalloc_8u(len); ippsBWTFwdGetSize_8u(wndSize, &pBWTFwdBuffSize); Ipp8u* pBWTFwdBuff = ippsMalloc_8u(pBWTFwdBuffSize); ippsBWTFwd_8u(pSrc, pDst, len, &pIndex, pBWTFwdBuff); ippsBWTInvGetSize_8u( wndSize, &pBWTInvBuffSize); Ipp8u* pBWTInvBuff = ippsMalloc_8u(pBWTInvBuffSize); ippsBWTInv_8u(pDst, pDstInv, len, pIndex, pBWTInvBuff); }
Result:
pDst -> "bagadeff" pDstInv -> "baadeffg"