Fix portable mode on macOS.

include/zelda_support.h

@@ -12,7 +12,8 @@ namespace zelda64 {
 // Apple specific methods that usually require Objective-C. Implemented in support_apple.mm.
 #ifdef __APPLE__
     void dispatch_on_ui_thread(std::function<void()> func);
-    const char* get_bundle_resource_directory();
+    std::filesystem::path get_bundle_resource_directory();
+    std::filesystem::path get_bundle_directory();
 #endif
 }
 

src/game/config.cpp

@@ -2,6 +2,7 @@
 #include "recomp_input.h"
 #include "zelda_sound.h"
 #include "zelda_render.h"
+#include "zelda_support.h"
 #include "ultramodern/config.hpp"
 #include "librecomp/files.hpp"
 #include <filesystem>
@@ -136,6 +137,14 @@ std::filesystem::path zelda64::get_app_folder_path() {
        return std::filesystem::current_path();
    }
 
+#if defined(__APPLE__)
+   // Check for portable file in the directory containing the app bundle.
+   const auto app_bundle_path = zelda64::get_bundle_directory().parent_path();
+   if (std::filesystem::exists(app_bundle_path / "portable.txt")) {
+       return app_bundle_path;
+   }
+#endif
+
    std::filesystem::path recomp_dir{};
 
 #if defined(_WIN32)

src/main/support.cpp

@@ -25,9 +25,7 @@ namespace zelda64 {
     std::filesystem::path get_asset_path(const char* asset) {
         std::filesystem::path base_path = "";
 #if defined(__APPLE__)
-        const char* resource_dir = get_bundle_resource_directory();
-        base_path = resource_dir;
-        free((void*)resource_dir);
+        base_path = get_bundle_resource_directory();
 #endif
 
         return base_path / "assets" / asset;

src/main/support_apple.mm

@@ -1,4 +1,5 @@
 #include "zelda_support.h"
+#include <dlfcn.h>
 #import <Foundation/Foundation.h>
 #import <objc/runtime.h>
 #import <objc/message.h>
@@ -12,9 +13,41 @@ namespace zelda64 {
         });
     }
 
-    const char* get_bundle_resource_directory() {
+    std::filesystem::path get_bundle_resource_directory() {
         NSString *bundlePath = [[NSBundle mainBundle] resourcePath];
-        return strdup([bundlePath UTF8String]);
+        return std::filesystem::path([bundlePath UTF8String]);
+    }
+
+    std::filesystem::path get_bundle_directory() {
+        NSURL *bundleUrl = [[NSBundle mainBundle] bundleURL];
+
+        // The OS may relocate the app elsewhere for security reasons if, for example,
+        // it was downloaded and opened from the Downloads folder. In this case, we need
+        // to untranslocate the path to find out where the actual app bundle is.
+        if (void* securityHandle = dlopen("/System/Library/Frameworks/Security.framework/Security", RTLD_LAZY)) {
+            using IsTranslocatedURLFunc = Boolean (*)(CFURLRef path, bool* isTranslocated,
+                                                      CFErrorRef* __nullable error);
+            using CreateOriginalPathForURLFunc = CFURLRef __nullable (*)(CFURLRef translocatedPath,
+                                                                         CFErrorRef* __nullable error);
+
+            const auto IsTranslocatedURL = reinterpret_cast<IsTranslocatedURLFunc>(
+                dlsym(securityHandle, "SecTranslocateIsTranslocatedURL"));
+            const auto CreateOriginalPathForURL = reinterpret_cast<CreateOriginalPathForURLFunc>(
+                dlsym(securityHandle, "SecTranslocateCreateOriginalPathForURL"));
+
+            bool translocated = false;
+            if (IsTranslocatedURL && CreateOriginalPathForURL &&
+                IsTranslocatedURL((__bridge CFURLRef) bundleUrl, &translocated, nullptr) && translocated) {
+                CFURLRef untranslocated = CreateOriginalPathForURL((__bridge CFURLRef) bundleUrl, nullptr);
+                if (untranslocated) {
+                    bundleUrl = (NSURL*) untranslocated;
+                }
+            }
+
+            dlclose(securityHandle);
+        }
+
+        return std::filesystem::path([bundleUrl fileSystemRepresentation]);
     }
 }