COMMON: Introduce SaveFileManager::exists

Checks if a savefile with given name exists.

Implement on all backends.

backends/platform/dc/vmsave.cpp

@@ -336,6 +336,10 @@ public:
 	}
 
 	Common::StringArray listSavefiles(const Common::String &pattern) override;
+
+	bool exists(const Common::String &filename) override {
+		return InVMSave().readSaveGame(filename.c_str());
+	}
 };
 
 void OutVMSave::finalize()

backends/platform/n64/framfs_save_manager.h

@@ -143,6 +143,10 @@ public:
 	}
 
 	Common::StringArray listSavefiles(const Common::String &pattern) override;
+
+	bool exists(const Common::String &filename) override {
+		return InFRAMSave().readSaveGame(filename.c_str());
+	}
 };
 
 

backends/platform/n64/pakfs_save_manager.h

@@ -145,6 +145,10 @@ public:
 	}
 
 	Common::StringArray listSavefiles(const Common::String &pattern) override;
+
+	bool exists(const Common::String &filename) override {
+		return InPAKSave().readSaveGame(filename.c_str());
+	}
 };
 
 

backends/saves/default/default-saves.cpp

@@ -222,6 +222,20 @@ bool DefaultSaveFileManager::removeSavefile(const Common::String &filename) {
 	}
 }
 
+bool DefaultSaveFileManager::exists(const Common::String &filename) {
+	// Assure the savefile name cache is up-to-date.
+	assureCached(getSavePath());
+	if (getError().getCode() != Common::kNoError)
+		return false;
+
+	for (Common::StringArray::const_iterator i = _lockedFiles.begin(), end = _lockedFiles.end(); i != end; ++i) {
+		if (filename == *i)
+			return true;
+	}
+
+	return _saveFileCache.contains(filename);
+}
+
 Common::String DefaultSaveFileManager::getSavePath() const {
 
 	Common::String dir;

backends/saves/default/default-saves.h

@@ -44,6 +44,7 @@ public:
 	Common::InSaveFile *openForLoading(const Common::String &filename) override;
 	Common::OutSaveFile *openForSaving(const Common::String &filename, bool compress = true) override;
 	bool removeSavefile(const Common::String &filename) override;
+	bool exists(const Common::String &filename) override;
 
 #ifdef USE_LIBCURL
 

common/savefile.h

@@ -268,6 +268,15 @@ public:
 	 * for saving or loading because they are being synced by CloudManager.
 	 */
 	virtual void updateSavefilesList(StringArray &lockedFiles) = 0;
+
+	/**
+	 * Checks if the savefile exists.
+	 *
+	 * @param name Name of the save file.
+	 *
+	 * @return true if the file exists. false otherwise.
+	 */
+	virtual bool exists(const String &name) = 0;
 };
 
 /** @} */