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#if !defined(AFX_MEMORYFIND__H__INCLUDED_)
#define AFX_MEMORYFIND__H__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
__inline LPVOID MemoryFind(SIZE_T dwFrom,LPCVOID lpcSource,SIZE_T dwSourceSize,LPCVOID lpcWhatFind,SIZE_T dwWhatFindSize)
{
LPVOID lpRet=NULL;
__asm
{
push ebx // ñîõðàíÿåì ðåãèñòð
push edi // ñîõðàíÿåì ðåãèñòð
push esi // ñîõðàíÿåì ðåãèñòð
mov ecx,dwSourceSize //; ecx = Source string Size
test ecx,ecx // is size unknown?
jz short end_func
mov edx,dwWhatFindSize //; edx = WhatFind string Size
test edx,edx // is size unknown?
jz short end_func
mov ebx,dwFrom // ebx - start pos in Source string
mov edi,lpcSource //; edi = Source string
mov esi,lpcWhatFind //; esi = WhatFind string
cmp ebx,ecx // ïðîâåðêà ecx(=len)=>ulFrom
jae short end_func
add edi,ebx // ñäâèãàåì íà÷àëî íà ulFrom(íà÷ ñìåùåí)
sub ecx,ebx // óìåíüøàåì äëèííó SourceSize íà ulFrom(íà÷ ñìåùåí)
cmp ecx,edx // ïðîâåðêà NEWSourceSize ??? ulWhatFindSize
je short begin_memorycompare // NEWulSourceSize==ulWhatFindSize, Source ??? WhatFind
jl short end_func // NEWulSourceSize<ulWhatFindSize, => Source!=WhatFind
sub ecx,edx // óìåíüøàåì äëèííó SourceSize íà ulWhatFindSize
inc ecx
mov al,[esi] //; al=search byte
dec edi
cld //; ñêàíèðóÿ â ïðÿìîì íàïðàâëåíèè
find_loop:
test ecx,ecx
jz short end_func
inc edi
repne scasb //; find that byte
dec 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
begin_memorycompare:
push esi
push edi
push ecx
mov ecx,edx //; ulWhatFindSize áàéòîâ (CX èñïîëüçóåòñÿ â REPE),
repe cmpsb //; ñðàâíèâàåì èõ.
pop ecx
pop edi
pop esi
jne short find_loop //; ïðèçíàê ZF = 0, åñëè ñðàâíèâàåìûå
//; ñòðîêè íå ñîâïàäàþò (mismatch) match:
//; åñëè ìû ïîïàëè ñþäà, çíà÷èò, îíè
//; ñîâïàäàþò (match)
mov lpRet,edi //; ax=pointer to byte
end_func:
pop esi // âîññòàíàâëèâàåì ñîäåðæèìîå ðåãèñòðà
pop edi // âîññòàíàâëèâàåì ñîäåðæèìîå ðåãèñòðà
pop ebx // âîññòàíàâëèâàåì ñîäåðæèìîå ðåãèñòðà
}
return(lpRet);
}
#endif // !defined(AFX_MEMORYFIND__H__INCLUDED_)
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