Method FindPatternInFile

tools/gdc-psyfork/MemoryUtils.cpp:71–138

}

void *MemoryUtils::FindPatternInFile(int fd, const char *pattern, size_t len, int &matches, bool &atFuncStart)
{
	size_t size;
	size = lseek (fd , 0 , SEEK_END);
	
	matches = 0;
	// TODO: fix this
	atFuncStart = true;

	lseek(fd, 0, SEEK_SET);

	void *map;
	char *ptr, *start, *end;
	bool found = true;
	map = mmap(0, size, PROT_READ, MAP_SHARED, fd, 0);

	ptr = (char *)map;
	start = ptr;
	end = ptr + size;
	
	void *firstMatch = NULL;

	while (ptr < end)
	{
		found = true;
		for (register size_t i = 0; i < len; i++)
		{
			if (pattern[i] != '\x2A' && pattern[i] != ptr[i])
			{
				found = false;
				break;
			}
		}

		if (found)
		{
			if( !firstMatch )
			{
				firstMatch = ptr;
				if( ptr - start >= 1 )
				{
					unsigned char oneBack = *(unsigned char*)((intptr_t)ptr - 1);
					if( oneBack != 0xC3 && oneBack != 0xCB && oneBack != 0xCC )
					{
						if( ptr - start >= 3 )
						{
							unsigned char threeBack = *(unsigned char*)((intptr_t)ptr - 3);
							if( threeBack != 0xCA && threeBack != 0xC2 )
							{
								atFuncStart = false;
							}
						}
						else
						{
							atFuncStart = false;
						}
					}
				}