Add serial detection for Wii

tasks/task_database.c

@@ -75,6 +75,8 @@ int detect_ps1_game(const char *track_path, char *game_id);
 
 int detect_psp_game(const char *track_path, char *game_id);
 
+int detect_serial_ascii_game(const char *track_path, char *game_id);
+
 static void database_info_set_type(database_info_handle_t *handle, enum database_type type)
 {
    if (!handle)
@@ -139,10 +141,21 @@ static int iso_get_serial(database_state_handle_t *db_state,
       database_info_handle_t *db, const char *name, char* serial)
 {
    const char* system_name = NULL;
-   int                 rv  = detect_system(name, &system_name);
 
-   if (rv < 0)
+   // Check if the system was not auto-detected.
-      return rv;
+   if (detect_system(name, &system_name) < 0)
+   {
+      // Attempt to read an ASCII serial, like Wii.
+      if (detect_serial_ascii_game(name, serial))
+      {
+         // ASCII serial (Wii) was detected.
+         RARCH_LOG("%s '%s'\n", msg_hash_to_str(MSG_FOUND_DISK_LABEL), serial);
+         return 0;
+      }
+
+      // Any other non-system specific detection methods?
+      return 0;
+   }
 
    if (string_is_equal_fast(system_name, "psp", 3))
    {

tasks/task_database_cue.c

@@ -153,7 +153,7 @@ static int detect_ps1_game_sub(const char *track_path,
    uint8_t* boot_file;
    int skip, frame_size, is_mode1, cd_sector;
    uint8_t buffer[2048 * 2];
-   RFILE                *fp = 
+   RFILE                *fp =
       filestream_open(track_path, RFILE_MODE_READ, -1);
    if (!fp)
       return 0;
@@ -328,13 +328,65 @@ int detect_psp_game(const char *track_path, char *game_id)
    return rv;
 }
 
+/**
+ * Check for an ASCII serial in the first few bits of the ISO (Wii).
+ */
+int detect_serial_ascii_game(const char *track_path, char *game_id)
+{
+   unsigned pos;
+   int numberOfAscii = 0;
+   bool rv   = false;
+   RFILE *fd = filestream_open(track_path, RFILE_MODE_READ, -1);
+
+   // Attempt to load the file.
+   if (!fd)
+   {
+      RARCH_LOG("%s: %s\n",
+            msg_hash_to_str(MSG_COULD_NOT_OPEN_DATA_TRACK),
+            strerror(errno));
+      return -errno;
+   }
+
+   for (pos = 0; pos < 10000; pos++)
+   {
+      filestream_seek(fd, pos, SEEK_SET);
+      if (filestream_read(fd, game_id, 10000) > 0)
+      {
+         game_id[15] = '\0';
+         numberOfAscii = 0;
+
+         // Loop through until we run out of ASCII characters.
+         for (int i = 0; i < 15; i++) {
+            // Is the given character ASCII? A-Z, 0-9, -
+            if (game_id[i] == 45 || (game_id[i] >= 48 && game_id[i] <= 57) || (game_id[i] >= 65 && game_id[i] <= 90)) {
+               numberOfAscii++;
+            }
+            else {
+               break;
+            }
+         }
+
+         // If the length of the text is between 3 and 9 characters, it could be a serial.
+         if (numberOfAscii > 3 && numberOfAscii < 9) {
+            // Cut the string off, and return it as a valid serial.
+            game_id[numberOfAscii] = '\0';
+            rv = true;
+            break;
+         }
+      }
+   }
+
+   filestream_close(fd);
+   return rv;
+}
+
 int detect_system(const char *track_path, const char **system_name)
 {
    int rv;
    char magic[MAGIC_LEN];
    int i;
    RFILE *fd = filestream_open(track_path, RFILE_MODE_READ, -1);
-   
+
    if (!fd)
    {
       RARCH_LOG("Could not open data track of file '%s': %s\n",
@@ -390,7 +442,7 @@ int find_first_data_track(const char *cue_path,
 {
    int rv;
    char tmp_token[MAX_TOKEN_LEN];
-   RFILE *fd                     = 
+   RFILE *fd                     =
       filestream_open(cue_path, RFILE_MODE_READ, -1);
 
    if (!fd)