VGMStream: Fix .txtp with option fragments in the filename

Plugins/vgmstream/vgmstream/VGMContainer.m

@@ -31,13 +31,22 @@
 
 + (NSArray *)urlsForContainerURL:(NSURL *)url
 {
-    if ([url fragment]) {
-        // input url already has fragment defined - no need to expand further
-        return [NSMutableArray arrayWithObject:url];
-    }
-    
     NSString * path = [[url absoluteString] stringByRemovingPercentEncoding];
 
+    if ([url fragment]) {
+        // input url might be a TXTP with fragment parameters, in which case
+        // we need to parse that anyway
+        NSString * frag = [url fragment];
+        NSUInteger len = [frag length];
+        if (len < 5 || ![[frag substringFromIndex:len - 5] isEqualToString:@".txtp"]) {
+            // input url already has fragment defined - no need to expand further
+            return [NSMutableArray arrayWithObject:url];
+        }
+        
+        path = [path stringByAppendingFormat:@"%%23%@", frag];
+        url = [NSURL fileURLWithPath:[path stringByRemovingPercentEncoding]];
+    }
+    
     VGMSTREAM * stream = init_vgmstream_from_cogfile([path UTF8String], 0);
 	if (!stream)
 	{

Plugins/vgmstream/vgmstream/VGMInterface.m

@@ -96,6 +96,16 @@ STREAMFILE *cogsf_create_from_path(const char *path) {
     NSString * urlString = [NSString stringWithUTF8String:path];
     NSURL * url = [NSURL URLWithDataRepresentation:[urlString dataUsingEncoding:NSUTF8StringEncoding] relativeToURL:nil];
     
+    if ([url fragment]) {
+        // .TXTP fragments need an override here
+        NSString * frag = [url fragment];
+        NSUInteger len = [frag length];
+        if (len > 5 && [[frag substringFromIndex:len - 5] isEqualToString:@".txtp"]) {
+            urlString = [urlString stringByReplacingOccurrencesOfString:@"#" withString:@"%23"];
+            url = [NSURL URLWithDataRepresentation:[urlString dataUsingEncoding:NSUTF8StringEncoding] relativeToURL:nil];
+        }
+    }
+    
     return cogsf_create_from_url(url);
 }