Fix FileUtils on macOS (#1863)

* Fix FileUtils::getFileSize() not returning -1 when file is not found

* Fix FileUtils::fullPathForDirectory() not appending a trailing slash

* Fix `not` and `and` keyword usage

* Fix FileUtils::getDefaultResourceRootPath() returning nothing on macOS

* Fix FileUtils::isFileExist() returning true for directories on macOS

core/platform/FileUtils.cpp

@@ -715,48 +715,58 @@ std::string FileUtils::fullPathForDirectory(std::string_view dir) const
 {
     DECLARE_GUARD;
 
+    auto result = std::string();
+
     if (dir.empty())
     {
-        return "";
+        // result is ""
     }
-
-    if (isAbsolutePath(dir))
+    else if (isAbsolutePath(dir))
     {
-        return std::string{dir};
+        result = dir;
     }
-
-    // Already Cached ?
-    auto cacheIter = _fullPathCacheDir.find(dir);
-    if (cacheIter != _fullPathCacheDir.end())
+    else
     {
-        return cacheIter->second;
-    }
-    std::string longdir{dir};
-    std::string fullpath;
-
-    if (longdir[longdir.length() - 1] != '/')
-    {
-        longdir += "/";
-    }
-
-    for (const auto& searchIt : _searchPathArray)
-    {
-        fullpath = this->getPathForDirectory(longdir, searchIt);
-        if (!fullpath.empty() && isDirectoryExistInternal(fullpath))
+        // Already Cached ?
+        auto cacheIter = _fullPathCacheDir.find(dir);
+        if (cacheIter != _fullPathCacheDir.end())
         {
-            // Using the filename passed in as key.
-            _fullPathCacheDir.emplace(dir, fullpath);
-            return fullpath;
+            result = cacheIter->second;
+        }
+        else
+        {
+            std::string longdir{dir};
+
+            if (longdir[longdir.length() - 1] != '/')
+            {
+                longdir += "/";
+            }
+
+            for (const auto& searchIt : _searchPathArray)
+            {
+                auto fullpath = this->getPathForDirectory(longdir, searchIt);
+                if (!fullpath.empty() && isDirectoryExistInternal(fullpath))
+                {
+                    // Using the filename passed in as key.
+                    _fullPathCacheDir.emplace(dir, fullpath);
+                    result = fullpath;
+                    break;
+                }
+            }
+
+            if (result.empty() && isPopupNotify())
+            {
+                AXLOG("axmol: fullPathForDirectory: No directory found at %s. Possible missing directory.", dir.data());
+            }
         }
     }
 
-    if (isPopupNotify())
+    if (!result.empty() && result.back() != '/')
     {
-        AXLOG("axmol: fullPathForDirectory: No directory found at %s. Possible missing directory.", dir.data());
+        result += '/';
     }
 
-    // The file wasn't found, return empty string.
-    return "";
+    return result;
 }
 
 std::string FileUtils::fullPathFromRelativeFile(std::string_view filename, std::string_view relativeFile) const
@@ -1330,7 +1340,7 @@ int64_t FileUtils::getFileSize(std::string_view filepath) const
     {
         fullpath = fullPathForFilename(filepath);
         if (fullpath.empty())
-            return 0;
+            return -1;
         path = fullpath;
     }
     else

core/platform/apple/FileUtils-apple.h

@@ -48,7 +48,9 @@ class AX_DLL FileUtilsApple : public FileUtils
 public:
     FileUtilsApple();
     virtual ~FileUtilsApple();
-    /* override functions */
+
+    virtual bool init() override;
+
     virtual std::string getWritablePath() const override;
     virtual std::string getNativeWritableAbsolutePath() const override;
     virtual std::string getFullPathForFilenameWithinDirectory(std::string_view directory,

core/platform/apple/FileUtils-apple.mm

@@ -51,10 +51,26 @@ private:
     NSBundle* bundle_;
 };
 
+static std::string appendTrailingSlashToDir(std::string_view dir)
+{
+    auto result = std::string(dir);
+    if (not result.empty() and result.back() != '/')
+        result.push_back('/');
+    return result;
+}
+
 FileUtilsApple::FileUtilsApple() : pimpl_(new IMPL([NSBundle mainBundle])) {}
 
 FileUtilsApple::~FileUtilsApple() = default;
 
+bool FileUtilsApple::init()
+{
+    _defaultResRootPath = appendTrailingSlashToDir([[[NSBundle mainBundle] resourcePath] UTF8String]);
+
+    bool ret = FileUtils::init();
+    return ret;
+}
+
 #if AX_FILEUTILS_APPLE_ENABLE_OBJC
 void FileUtilsApple::setBundle(NSBundle* bundle)
 {
@@ -132,13 +148,18 @@ bool FileUtilsApple::isFileExistInternal(std::string_view filePath) const
                                                       inDirectory:[NSString stringWithUTF8String:path.c_str()]];
         if (fullpath != nil)
         {
-            ret = true;
+            BOOL isDir = NO;
+            if ([s_fileManager fileExistsAtPath:fullpath isDirectory:&isDir] && !isDir)
+            {
+                ret = true;
+            }
         }
     }
     else
     {
         // Search path is an absolute path.
-        if ([s_fileManager fileExistsAtPath:[NSString stringWithUTF8String:filePath.data()]])
+        BOOL isDir = NO;
+        if ([s_fileManager fileExistsAtPath:[NSString stringWithUTF8String:filePath.data()] isDirectory:&isDir] && !isDir)
         {
             ret = true;
         }
@@ -185,10 +206,10 @@ std::string FileUtilsApple::getPathForDirectory(std::string_view dir,
 
     if (path[0] == '/')
     {
-        BOOL isDir = false;
+        BOOL isDir = NO;
         if ([s_fileManager fileExistsAtPath:[NSString stringWithUTF8String:path.data()] isDirectory:&isDir])
         {
-            return isDir ? path : "";
+            return appendTrailingSlashToDir(isDir ? path : "");
         }
     }
     else
@@ -197,7 +218,7 @@ std::string FileUtilsApple::getPathForDirectory(std::string_view dir,
                                                            ofType:nil];
         if (fullpath != nil)
         {
-            return [fullpath UTF8String];
+            return appendTrailingSlashToDir([fullpath UTF8String]);
         }
     }
     return "";
@@ -206,27 +227,33 @@ std::string FileUtilsApple::getPathForDirectory(std::string_view dir,
 std::string FileUtilsApple::getFullPathForFilenameWithinDirectory(std::string_view directory,
                                                                   std::string_view filename) const
 {
+    auto fullPath = std::string();
+
+    // Build full path for the file
     if (directory[0] != '/')
     {
-        NSString* fullpath = [pimpl_->getBundle() pathForResource:[NSString stringWithUTF8String:filename.data()]
-                                                           ofType:nil
-                                                      inDirectory:[NSString stringWithUTF8String:directory.data()]];
-        if (fullpath != nil)
+        NSString* path = [pimpl_->getBundle() pathForResource:[NSString stringWithUTF8String:filename.data()]
+                                                       ofType:nil
+                                                  inDirectory:[NSString stringWithUTF8String:directory.data()]];
+        if (path != nil)
         {
-            return [fullpath UTF8String];
+            fullPath = [path UTF8String];
         }
     }
     else
     {
-        std::string fullPath{directory};
+        fullPath = directory;
         fullPath += filename;
-        // Search path is an absolute path.
-        if ([s_fileManager fileExistsAtPath:[NSString stringWithUTF8String:fullPath.c_str()]])
-        {
-            return fullPath;
-        }
     }
-    return "";
+
+    // Check if there's a file at path
+    BOOL isDir = NO;
+    if (![s_fileManager fileExistsAtPath:[NSString stringWithUTF8String:fullPath.c_str()] isDirectory:&isDir] || isDir)
+    {
+        fullPath.clear();
+    }
+
+    return fullPath;
 }
 
 bool FileUtilsApple::createDirectory(std::string_view path) const