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#include "common.h"
#include "patcher.h"
#include <algorithm>
#include <vector>
#include <windows.h>
StaticPatcher *StaticPatcher::ms_head;
StaticPatcher::StaticPatcher(Patcher func)
: m_func(func)
{
m_next = ms_head;
ms_head = this;
}
void
StaticPatcher::Apply()
{
StaticPatcher *current = ms_head;
while(current){
current->Run();
current = current->m_next;
}
ms_head = nil;
}
std::vector<uint32> usedAddresses;
static DWORD protect[2];
static uint32 protect_address;
static uint32 protect_size;
void
Protect_internal(uint32 address, uint32 size)
{
protect_address = address;
protect_size = size;
VirtualProtect((void*)address, size, PAGE_EXECUTE_READWRITE, &protect[0]);
}
void
Unprotect_internal(void)
{
VirtualProtect((void*)protect_address, protect_size, protect[0], &protect[1]);
}
void
InjectHook_internal(uint32 address, uint32 hook, int type)
{
if(std::any_of(usedAddresses.begin(), usedAddresses.end(),
[address](uint32 value) { return value == address; })) {
debug("Used address %#06x twice when injecting hook\n", address);
}
usedAddresses.push_back(address);
switch(type){
case PATCH_JUMP:
VirtualProtect((void*)address, 5, PAGE_EXECUTE_READWRITE, &protect[0]);
*(uint8*)address = 0xE9;
break;
case PATCH_CALL:
VirtualProtect((void*)address, 5, PAGE_EXECUTE_READWRITE, &protect[0]);
*(uint8*)address = 0xE8;
break;
default:
VirtualProtect((void*)(address + 1), 4, PAGE_EXECUTE_READWRITE, &protect[0]);
break;
}
*(ptrdiff_t*)(address + 1) = hook - address - 5;
if(type == PATCH_NOTHING)
VirtualProtect((void*)(address + 1), 4, protect[0], &protect[1]);
else
VirtualProtect((void*)address, 5, protect[0], &protect[1]);
}
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