Memory-writing functions

[Novoc 1]

Just something I wrote up, handy.

 

Wrote it to simply write Jumps, use for w/e.

 

WriteMemory - write an byte-array to memory-address.

WriteJump - both arguments are addresses, where to jump from and where to jump to.

WriteNop - address and how many to write.

 

[hide_me]

//n! yo

#ifndef MEMUTILS_H
#define MEMUTILS_H

BOOL WriteMemory( DWORD dwAddress, const void* cpvPatch, DWORD dwSize )
{
DWORD dwProtect;

if( VirtualProtect( (void*)dwAddress, dwSize, PAGE_READWRITE, &dwProtect ) ) //Unprotect the memory
	memcpy( (void*)dwAddress, cpvPatch, dwSize ); //Write our patch
else
	return false; //Failed to unprotect, so return false..

return VirtualProtect( (void*)dwAddress, dwSize, dwProtect, new DWORD ); //Reprotect the memory
}

BOOL WriteJump( DWORD From, DWORD To )
{
if( To < From + 128 && To > From - 128 ) //Short jump
{
	BYTE bpJump[2] = { 0xEB, ( To - From ) - 2 }; //Calculate opcode

	return WriteMemory( From, bpJump, 2 );
}
else //Far jump
{
	BYTE bpJump[5] = { 0xE9, 0x00, 0x00, 0x00, 0x00 };
	*(DWORD*)&bpJump[1] = ( To - From ) - 5; //Calculate jump

	return WriteMemory( From, bpJump, 5 );
}

return false; //If we end up here, something went horribly wrong
}

BOOL WriteNop( DWORD dwAddress, DWORD dwAmount )
{
BYTE bpNops[100]; //100 just incase I wanna do some gigantic NOPing 
memset( bpNops, 0x90, 100 ); //Fill byte-array with NOPs

return WriteMemory( dwAddress, bpNops, dwAmount );
}

#endif

[/hide_me]

Edited January 21, 2009 by Novoc

[xxka1saxx 0]

wanna see

[Guest Hayley]

nice.. nice feature for checking the jump size, would save 3 bytes

 

i like your coding style

[pr0hax 0]

Wanna see ^^ Nice

[Sucrose 0]

Let's see these bad boys.

[asdq 0]

reply.

[ΣLΣXTrO 1]

thx

[Geek4Ever 0]

nice

[Guest Alexander]

tt

[uruguayo20 0]

nice

[a1fahrrad 0]

[TomTheBig 0]

Just something I wrote up, handy.

 

Wrote it to simply write Jumps, use for w/e.

 

WriteMemory - write an byte-array to memory-address.

WriteJump - both arguments are addresses, where to jump from and where to jump to.

WriteNop - address and how many to write.

 

[ Hidden part. View original post. ]

reply

[ntpkiller1 0]

thx

[GHB-Raider 0]

wow

[KuscheltierDompteur 0]

try =)

[SeXyDreaMz 1]

Look on it.

[akademiks 1]

rep

[Struktur 0]

rep

[valve 0]

rep

[Alpacino 0]

rep

[madazn 0]

Just something I wrote up, handy.

 

Wrote it to simply write Jumps, use for w/e.

 

WriteMemory - write an byte-array to memory-address.

WriteJump - both arguments are addresses, where to jump from and where to jump to.

WriteNop - address and how many to write.

 

[ Hidden part. View original post. ]

lemme see!!!

[Loller0 0]

wanna see

[yankeemay 0]

ty

[xXXiiBladeiiXXx 0]

reply

[lionheartpk1 0]

Just something I wrote up, handy.

 

Wrote it to simply write Jumps, use for w/e.

 

WriteMemory - write an byte-array to memory-address.

WriteJump - both arguments are addresses, where to jump from and where to jump to.

WriteNop - address and how many to write.

 

[ Hidden part. View original post. ]

nice work