Cheats: find the cheat file by CRC32.

cheats.cpp

@@ -49,8 +49,49 @@ struct CheatComp
 
 static char cheat_zip[1024] = {};
 
-void cheats_init(char *rom_path)
-{
+int find_by_crc(uint32_t romcrc)
+{
+	sprintf(cheat_zip, "%s/cheats/%s", getRootDir(), HomeDir);
+	DIR *d = opendir(cheat_zip);
+	if (!d)
+	{
+		printf("Couldn't open dir: %s\n", cheat_zip);
+		return 0;
+	}
+
+	struct dirent *de = 0;
+	while((de = readdir(d)))
+	{
+		if (de->d_type == DT_REG)
+		{
+			char *ext = strcasestr(de->d_name, ".zip");
+			if (ext && (ext - de->d_name) > 10)
+			{
+				ext -= 10;
+				if (ext[0] == '[' && ext[9] == ']')
+				{
+					uint32_t crc = 0;
+					if (sscanf(ext, "[%X].zip", &crc) == 1)
+					{
+						if (crc == romcrc)
+						{
+							strcat(cheat_zip, "/");
+							strcat(cheat_zip, de->d_name);
+							closedir(d);
+							return 1;
+						}
+					}
+				}
+			}
+		}
+	}
+
+	closedir(d);
+	return 0;
+}
+
+void cheats_init(char *rom_path, uint32_t romcrc)
+{
 	cheats.clear();
 	loaded = 0;
 	cheat_zip[0] = 0;
@@ -68,9 +109,9 @@ void cheats_init(char *rom_path)
 	{
 		memset(&_z, 0, sizeof(_z));
 
-		char *rom_name = strrchr(rom_path, '/');
-		if (!rom_name) return;
-
+		char *rom_name = strrchr(rom_path, '/');
+		if (!rom_name) return;
+
 		sprintf(cheat_zip, "%s/cheats/%s%s", getRootDir(), HomeDir, rom_name);
 		char *p = strrchr(cheat_zip, '.');
 		if (p) *p = 0;
@@ -78,11 +119,17 @@ void cheats_init(char *rom_path)
 
 		if (!mz_zip_reader_init_file(&_z, cheat_zip, 0))
 		{
-			printf("no cheat file %s\n", cheat_zip);
-			return;
+			memset(&_z, 0, sizeof(_z));
+			if (!find_by_crc(romcrc) || !mz_zip_reader_init_file(&_z, cheat_zip, 0))
+			{
+				printf("no cheat file found\n");
+				return;
+			}
 		}
 	}
 
+	printf("Using cheat file: %s\n", cheat_zip);
+
 	mz_zip_archive *z = new mz_zip_archive(_z);
 	for (size_t i = 0; i < mz_zip_reader_get_num_files(z); i++)
 	{
@@ -325,6 +372,6 @@ void cheats_toggle()
 }
 
 int cheats_loaded()
-{
+{
 	return loaded;
 }