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#if !defined(AFX_MEMORYCOMPARE__H__INCLUDED_)
#define AFX_MEMORYCOMPARE__H__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// If the string pointed to by lpString1 is less than the string pointed
// to by lpString2, the return value is negative.
// If the string pointed to by lpString1 is greater than the string pointed
// to by lpString2, the return value is positive.
// If the strings are equal, the return value is zero.
//
// lpString1<lpString2 >> ret=1=CSTR_LESS_THAN
// lpString1=lpString2 >> ret=2=CSTR_EQUAL
// lpString1>lpString2 >> ret=3=CSTR_GREATER_THAN
/*__inline DWORD MemoryCompare(LPCVOID lpcSource1,SIZE_T dwSource1Size,LPCVOID lpcSource2,SIZE_T dwSource2Size)
{
DWORD dwRet;
__asm
{
mov ecx,dwSource1Size //; ecx = Source string 1 Size
cmp ecx,dwSource2Size //; ñâåðÿåì äëèííû ó÷àñòêîâ ïàìÿòè
jg short greater_than
jl short less_than
test ecx,ecx
jz short equal //; NULL=NULL
mov esi,lpcSource1 //; edi = Source string 1
mov edi,lpcSource2 //; esi = Source string 2
cmp edi,esi //; ñâåðÿåì óêàçàòåëè íà ó÷àñòêè ïàìÿòè
je short equal //; ýòî îäèí è òîòæå ó÷àñòîê, îíè åñòåñòâåííî ðàâíû
test esi,esi //; lpcSource1=NULL, lpcSource1<lpcSource2
jz short less_than //; CSTR_LESS_THAN
test edi,edi //; lpcSource2=NULL, lpcSource1>lpcSource2
jz short greater_than //; CSTR_GREATER_THAN
//cld //; ñêàíèðóÿ â ïðÿìîì íàïðàâëåíèè
repe cmpsb //; öèêë ñðàâíåíèÿ.
cmp_loop:
//sub ecx,4
//jz short equal
//inc esi
//inc edi
//mov al,byte ptr [esi]
//cmpsd
//cmp al,byte ptr [edi]
//je short cmp_loop
jg short greater_than
jl short less_than
equal: //; åñëè ìû ïîïàëè ñþäà, çíà÷èò, îíè
mov dwRet,CSTR_EQUAL //; ñîâïàäàþò (match)
jmp end_func
less_than: //; íå ñîâïàäàþò
mov dwRet,CSTR_LESS_THAN
jmp end_func
greater_than:
mov dwRet,CSTR_GREATER_THAN
end_func:
}
return(dwRet);
}//*/
__inline DWORD MemoryCompare(LPCVOID lpcSource1,SIZE_T dwSource1Size,LPCVOID lpcSource2,SIZE_T dwSource2Size)
{
DWORD dwRet;
if (dwSource1Size==dwSource2Size)
{
if (lpcSource1==lpcSource2)
{
dwRet=CSTR_EQUAL;
}else{
if (lpcSource1 && lpcSource2)
{
#ifdef _INC_MEMORY
dwRet=(2+memcmp(lpcSource1,lpcSource2,dwSource1Size));
#else
SIZE_T dwDiffPosition;
//dwDiffPosition=RtlCompareMemory(lpcSource1,lpcSource2,dwSource1Size);
for(dwDiffPosition=0; (dwDiffPosition<dwSource1Size) && (((const BYTE*)lpcSource1)[dwDiffPosition]==((const BYTE*)lpcSource2)[dwDiffPosition]); dwDiffPosition++);
if (dwDiffPosition==dwSource1Size)
{
dwRet=CSTR_EQUAL;
}else{
if ((*((BYTE*)(((SIZE_T)lpcSource1)+dwDiffPosition)))>(*((BYTE*)(((SIZE_T)lpcSource2)+dwDiffPosition))))
{
dwRet=CSTR_GREATER_THAN;
}else{
dwRet=CSTR_LESS_THAN;
}
}
#endif
}else{
if (lpcSource1)
{//lpcSource2==NULL
dwRet=CSTR_GREATER_THAN;
}else{//lpcSource1==NULL
dwRet=CSTR_LESS_THAN;
}
}
}
}else{
if (dwSource1Size<dwSource2Size)
{
dwRet=CSTR_LESS_THAN;
}else{
dwRet=CSTR_GREATER_THAN;
}
}
return(dwRet);
}//*/
/*
__inline DWORD MemoryCompareEx(LPCVOID lpcSource1,SIZE_T dwSource1Size,LPCVOID lpcSource2,SIZE_T dwSource2Size,SIZE_T *pdwDiffPosition)
{
DWORD dwRet;
if (dwSource1Size==dwSource2Size)
{
if (lpcSource1==lpcSource2)
{
dwRet=CSTR_EQUAL;
}else{
if (lpcSource1 && lpcSource2)
{
SIZE_T dwDiffPosition;
dwDiffPosition=RtlCompareMemory(lpcSource1,lpcSource2,dwSource1Size);
if (dwDiffPosition==dwSource1Size)
{
dwRet=CSTR_EQUAL;
}else{
if ((*((BYTE*)(((SIZE_T)lpcSource1)+dwDiffPosition)))>(*((BYTE*)(((SIZE_T)lpcSource2)+dwDiffPosition))))
{
dwRet=CSTR_GREATER_THAN;
}else{
dwRet=CSTR_LESS_THAN;
}
}
if (pdwDiffPosition) (*pdwDiffPosition)=dwDiffPosition;
}else{
if (lpcSource1)
{//lpcSource2==NULL
dwRet=CSTR_GREATER_THAN;
}else{//lpcSource1==NULL
dwRet=CSTR_LESS_THAN;
}
}
}
}else{
if (dwSource1Size<dwSource2Size)
{
dwRet=CSTR_LESS_THAN;
}else{
dwRet=CSTR_GREATER_THAN;
}
}
return(dwRet);
}
*/
#endif // !defined(AFX_MEMORYCOMPARE__H__INCLUDED_)
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