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/*
* Copyright (c) 2003 Rozhuk Ivan <rozhuk.im@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#if !defined(AFX_MEMORYFINDBYTE__H__INCLUDED_)
#define AFX_MEMORYFINDBYTE__H__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
__inline void *MemoryFindByte(size_t dwFrom,const void *pBuff,size_t dwBuffSize,unsigned char chWhatFind)
{
void *pRet=NULL;
if (pBuff && dwBuffSize && dwFrom<dwBuffSize)
{
pRet=(void*)memchr((const void*)(((size_t)pBuff)+dwFrom),chWhatFind,(dwBuffSize-dwFrom));
}
return(pRet);
}
#ifndef _WIN64
__inline void *MemoryFindByteReverse(size_t dwFrom,const void *pBuff,size_t dwBuffSize,unsigned char chWhatFind)
{
void *pRet=NULL;
__asm
{
push ebx // ñîõðàíÿåì ðåãèñòð
push edi // ñîõðàíÿåì ðåãèñòð
push esi // ñîõðàíÿåì ðåãèñòð
mov ecx,dwBuffSize
test ecx,ecx //; ïðîâåðêà âõîäíîãî ïàðàìåòðà, îí !=0
je short end_func
mov edi,pBuff //; 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 pRet,edi //; ax=pointer to byte
end_func:
cld
pop esi // âîññòàíàâëèâàåì ñîäåðæèìîå ðåãèñòðà
pop edi // âîññòàíàâëèâàåì ñîäåðæèìîå ðåãèñòðà
pop ebx // âîññòàíàâëèâàåì ñîäåðæèìîå ðåãèñòðà
}
return(pRet);
}
#endif
#endif // !defined(AFX_MEMORYFINDBYTE__H__INCLUDED_)
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