fix: Open with crashing on macOS

#1070

lib/libimhex/source/helpers/utils_macos.m

@@ -10,6 +10,8 @@
     #include <stdlib.h>
     #include <stdint.h>
 
+    #import <Cocoa/Cocoa.h>
+
     void openWebpageMacos(const char *url) {
         CFURLRef urlRef = CFURLCreateWithBytes(NULL, (uint8_t*)(url), strlen(url), kCFStringEncodingASCII, NULL);
         LSOpenCFURLRef(urlRef, NULL);
@@ -30,4 +32,20 @@
         return [[NSScreen mainScreen] backingScaleFactor];
     }
 
+    @interface HexDocument : NSDocument
+
+    @property (nonatomic, strong) NSData *fileData;
+
+    @end
+
+    @implementation HexDocument
+
+    - (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:(NSError **)outError {
+        // Set the file data to the given data
+        self.fileData = data;
+        return YES;
+    }
+
+    @end
+
 #endif

resources/dist/macos/Info.plist.in

@@ -20,7 +20,7 @@
             <key>CFBundleTypeRole</key>
             <string>Editor</string>
             <key>NSDocumentClass</key>
-            <string>NSDocument</string>
+            <string>HexDocument</string>
             <key>CFBundleTypeName</key>
             <string>All Files</string>
         </dict>