add file existence check

Author: tc-mb

tools/mtmd/ane/ane.mm

@@ -15,6 +15,22 @@
     }
 
     NSString *pathString = [NSString stringWithUTF8String:model_path];
+    
+    // Check if file exists
+    NSFileManager *fileManager = [NSFileManager defaultManager];
+    if (![fileManager fileExistsAtPath:pathString]) {
+        NSLog(@"Error: ANE model file does not exist at path: %@", pathString);
+        return nullptr;
+    }
+    
+    // Check if it's a directory (for .mlmodelc packages)
+    BOOL isDirectory;
+    if ([fileManager fileExistsAtPath:pathString isDirectory:&isDirectory]) {
+        if (!isDirectory && ![pathString hasSuffix:@".mlmodelc"]) {
+            NSLog(@"Warning: ANE model path should typically be a .mlmodelc directory: %@", pathString);
+        }
+    }
+    
     NSURL *modelURL = [NSURL fileURLWithPath:pathString];
 
     NSLog(@"Loading ANE model from: %@", modelURL.absoluteString);
@@ -32,6 +48,7 @@
         return nullptr;
     }
 
+    NSLog(@"Successfully loaded ANE model from: %@", pathString);
     return model;
 }
 

tools/mtmd/mtmd.cpp

@@ -10,6 +10,7 @@
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
+#include <fstream>
 #include <limits>
 #include <vector>
 
@@ -159,7 +160,15 @@ struct mtmd_context {
 
         // Set ANE model path for iOS
         if (ctx_params.ane_model_path && ctx_v) {
+            // Check if ANE model file exists
+            std::ifstream ane_file(ctx_params.ane_model_path);
+            if (!ane_file.good()) {
+                throw std::runtime_error(string_format("ANE model file does not exist: %s", ctx_params.ane_model_path));
+            }
+            ane_file.close();
+            
             clip_set_ane_model_path(ctx_v, ctx_params.ane_model_path);
+            LOG_INF("ANE model path set to: %s\n", ctx_params.ane_model_path);
         }
         if (!ctx_v && !ctx_a) {
             throw std::runtime_error(string_format("Failed to load CLIP model from %s\n", mmproj_fname));