Android: Add content provider support to File::FileInfo

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/utils/ContentHandler.java

@@ -74,6 +74,31 @@ public class ContentHandler
     return false;
   }
 
+  /**
+   * @return -1 if not found, -2 if directory, file size otherwise
+   */
+  @Keep
+  public static long getSizeAndIsDirectory(String uri)
+  {
+    final String[] projection = new String[]{Document.COLUMN_MIME_TYPE, Document.COLUMN_SIZE};
+    try (Cursor cursor = getContentResolver().query(Uri.parse(uri), projection, null, null, null))
+    {
+      if (cursor != null && cursor.moveToFirst())
+      {
+        if (Document.MIME_TYPE_DIR.equals(cursor.getString(0)))
+          return -2;
+        else
+          return cursor.isNull(1) ? 0 : cursor.getLong(1);
+      }
+    }
+    catch (SecurityException e)
+    {
+      Log.error("Tried to get metadata for " + uri + " without permission");
+    }
+
+    return -1;
+  }
+
   @Nullable
   public static String getDisplayName(@NonNull Uri uri)
   {

Source/Android/jni/AndroidCommon/AndroidCommon.cpp

@@ -104,6 +104,14 @@ bool DeleteAndroidContent(const std::string& uri)
                                       IDCache::GetContentHandlerDelete(), ToJString(env, uri));
 }
 
+jlong GetAndroidContentSizeAndIsDirectory(const std::string& uri)
+{
+  JNIEnv* env = IDCache::GetEnvForThread();
+  return env->CallStaticLongMethod(IDCache::GetContentHandlerClass(),
+                                   IDCache::GetContentHandlerGetSizeAndIsDirectory(),
+                                   ToJString(env, uri));
+}
+
 int GetNetworkIpAddress()
 {
   JNIEnv* env = IDCache::GetEnvForThread();

Source/Android/jni/AndroidCommon/AndroidCommon.h

@@ -25,6 +25,9 @@ int OpenAndroidContent(const std::string& uri, const std::string& mode);
 
 // Deletes a given file.
 bool DeleteAndroidContent(const std::string& uri);
+// Returns -1 if not found, -2 if directory, file size otherwise.
+jlong GetAndroidContentSizeAndIsDirectory(const std::string& uri);
+
 int GetNetworkIpAddress();
 int GetNetworkPrefixLength();
 int GetNetworkGateway();

Source/Android/jni/AndroidCommon/IDCache.cpp

@@ -44,6 +44,7 @@ static jmethodID s_compress_cb_run;
 static jclass s_content_handler_class;
 static jmethodID s_content_handler_open_fd;
 static jmethodID s_content_handler_delete;
+static jmethodID s_content_handler_get_size_and_is_directory;
 
 static jclass s_network_helper_class;
 static jmethodID s_network_helper_get_network_ip_address;
@@ -210,6 +211,11 @@ jmethodID GetContentHandlerDelete()
   return s_content_handler_delete;
 }
 
+jmethodID GetContentHandlerGetSizeAndIsDirectory()
+{
+  return s_content_handler_get_size_and_is_directory;
+}
+
 jclass GetNetworkHelperClass()
 {
   return s_network_helper_class;
@@ -229,6 +235,7 @@ jmethodID GetNetworkHelperGetNetworkGateway()
 {
   return s_network_helper_get_network_gateway;
 }
+
 }  // namespace IDCache
 
 #ifdef __cplusplus
@@ -306,6 +313,8 @@ jint JNI_OnLoad(JavaVM* vm, void* reserved)
                                                      "(Ljava/lang/String;Ljava/lang/String;)I");
   s_content_handler_delete =
       env->GetStaticMethodID(s_content_handler_class, "delete", "(Ljava/lang/String;)Z");
+  s_content_handler_get_size_and_is_directory = env->GetStaticMethodID(
+      s_content_handler_class, "getSizeAndIsDirectory", "(Ljava/lang/String;)J");
 
   const jclass network_helper_class =
       env->FindClass("org/dolphinemu/dolphinemu/utils/NetworkHelper");

Source/Android/jni/AndroidCommon/IDCache.h

@@ -44,6 +44,7 @@ jmethodID GetCompressCallbackRun();
 jclass GetContentHandlerClass();
 jmethodID GetContentHandlerOpenFd();
 jmethodID GetContentHandlerDelete();
+jmethodID GetContentHandlerGetSizeAndIsDirectory();
 
 jclass GetNetworkHelperClass();
 jmethodID GetNetworkHelperGetNetworkIpAddress();

Source/Core/Common/FileUtil.cpp

@@ -78,19 +78,40 @@ FileInfo::FileInfo(const char* path) : FileInfo(std::string(path))
 #else
 FileInfo::FileInfo(const std::string& path) : FileInfo(path.c_str())
 {
+#ifdef ANDROID
+  if (IsPathAndroidContent(path))
+    AndroidContentInit(path);
+  else
+#endif
+    m_exists = stat(path.c_str(), &m_stat) == 0;
 }
 
 FileInfo::FileInfo(const char* path)
 {
-  m_exists = stat(path, &m_stat) == 0;
+#ifdef ANDROID
+  if (IsPathAndroidContent(path))
+    AndroidContentInit(path);
+  else
+#endif
+    m_exists = stat(path, &m_stat) == 0;
 }
 #endif
 
 FileInfo::FileInfo(int fd)
 {
-  m_exists = fstat(fd, &m_stat);
+  m_exists = fstat(fd, &m_stat) == 0;
 }
 
+#ifdef ANDROID
+void FileInfo::AndroidContentInit(const std::string& path)
+{
+  const jlong result = GetAndroidContentSizeAndIsDirectory(path);
+  m_exists = result != -1;
+  m_stat.st_mode = result == -2 ? S_IFDIR : S_IFREG;
+  m_stat.st_size = result >= 0 ? result : 0;
+}
+#endif
+
 bool FileInfo::Exists() const
 {
   return m_exists;

Source/Core/Common/FileUtil.h

@@ -113,6 +113,10 @@ public:
   u64 GetSize() const;
 
 private:
+#ifdef ANDROID
+  void AndroidContentInit(const std::string& path);
+#endif
+
   struct stat m_stat;
   bool m_exists;
 };