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#if !defined(AFX_MEMORYFINDBYTE__H__INCLUDED_)
#define AFX_MEMORYFINDBYTE__H__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
__inline LPVOID MemoryFindByte(SIZE_T dwFrom,LPCVOID lpcSource,SIZE_T dwSourceSize,unsigned char chWhatFind)
{
LPVOID lpRet=NULL;
if (lpcSource && dwSourceSize)
{
if (dwFrom<dwSourceSize)
{
lpRet=(LPVOID)memchr((LPCVOID)(((SIZE_T)lpcSource)+dwFrom),chWhatFind,(dwSourceSize-dwFrom));
}
}
return(lpRet);
}
__inline LPVOID MemoryFindByteReverse(SIZE_T dwFrom,LPCVOID lpcSource,SIZE_T dwSourceSize,unsigned char chWhatFind)
{
LPVOID lpRet=NULL;
__asm
{
push ebx // ñîõðàíÿåì ðåãèñòð
push edi // ñîõðàíÿåì ðåãèñòð
push esi // ñîõðàíÿåì ðåãèñòð
mov ecx,dwSourceSize
test ecx,ecx //; ïðîâåðêà âõîäíîãî ïàðàìåòðà, îí !=0
je short end_func
mov edi,lpcSource //; di = string
test edi,edi //; ïðîâåðêà âõîäíîãî ïàðàìåòðà, îí !=0
jz short end_func
mov eax,dwFrom
/////////////////////////////////////////////
cmp eax,ecx //; ïðîâåðêà ecx(=len)=>dwFrom
jae short end_func
std //; count 'up' on string this time
sub ecx,eax //; óìåíüøàåì äëèííó íà dwFrom(íà÷ ñìåùåí)
add edi,ecx //; ñäâèãàåì íà÷àëî íà dwSourceSize(íà êîíåö)
mov al,chWhatFind //; al=search byte
repne scasb //; find that byte
inc edi //; di points to byte which stopped scan
cmp [edi],al //; see if we have a hit
jne short end_func //; yes, point to byte
mov lpRet,edi //; ax=pointer to byte
end_func:
cld
pop esi // âîññòàíàâëèâàåì ñîäåðæèìîå ðåãèñòðà
pop edi // âîññòàíàâëèâàåì ñîäåðæèìîå ðåãèñòðà
pop ebx // âîññòàíàâëèâàåì ñîäåðæèìîå ðåãèñòðà
}
return(lpRet);
}
#endif // !defined(AFX_MEMORYFINDBYTE__H__INCLUDED_)
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