/* Native port of GVVPatch.cs (Jon Lech Johansen <jon@nanocrew.net>) by Paul Tenny <pwtenny@gmail.com> */
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>

int main (int argc, char *argv[])
{
	FILE *dll;
	unsigned char target[] = {0xBF,0x40,0x65,0x00,0x10,0xE9,0x36,0xFC,0xFF,0xFF}, *file_contents, the90[] = {0x90,0x90,0x90,0x90,0x90,0x90,0x90,0x90,0x90,0x90};
	const unsigned char file_location[512];
	HKEY Key;
	LONG l = 512, file_size = 0;
	
	RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\GoogleVideoViewer\\VLC", 0, KEY_QUERY_VALUE, &Key);
	RegQueryValueEx(Key, "InstallDir", NULL, NULL, (LPBYTE) file_location, &l);
	RegCloseKey(Key);
	snprintf(&file_location[l - 1], 512 - l, "\\plugins\\libaccess_http_plugin.dll");

	dll = fopen(file_location, "r+");
	fseek(dll, 0, SEEK_END);
	file_size = ftell(dll) + 1;
	file_contents = (char *) malloc (file_size);
	fseek(dll, 0, SEEK_SET);
	fread(file_contents, 1, file_size - 1, dll);
	
	unsigned int pos = 0;
	for(pos = 0; pos < file_size; pos++)
	{
		if (file_contents[pos] == target[0])
		{
			int found = 0;
			for (found = 0; found <= 9, (file_contents[pos + found] == target[found]); found++) {}
			if (found == 10) break;
		}
	}

	printf("%s: 0x%04x (%d)\n", file_location, pos, pos);
	fseek(dll, pos + 1, SEEK_SET);
	fwrite(&the90, 1, sizeof(the90), dll);
	fflush(dll);
	fclose(dll);
}