BLADERUNNER: Preliminary saving & loading support

Saving and loading is accessible via ScummVM dialogs.
No in-game UI support yet.

It is possible to load saves from original game via debugger console.
ScummVM saves have additional header and are incompatibile with original
game.

1 files changed, 96 insertions, 13 deletions

diff --git a/engines/bladerunner/detection.cpp b/engines/bladerunner/detection.cpp
index 934eea7759..8cd4288a0d 100644
--- a/engines/bladerunner/detection.cpp
+++ b/engines/bladerunner/detection.cpp
@@ -20,12 +20,17 @@
  *
  */
 
-#include "base/plugins.h"
-
-#include "engines/advancedDetector.h"
 
 #include "bladerunner/bladerunner.h"
 #include "bladerunner/detection_tables.h"
+#include "bladerunner/savefile.h"
+
+#include "common/config-manager.h"
+#include "common/system.h"
+#include "common/savefile.h"
+#include "common/serializer.h"
+
+#include "engines/advancedDetector.h"
 
 namespace BladeRunner {
 
@@ -38,19 +43,32 @@ static const PlainGameDescriptor bladeRunnerGames[] = {
 
 class BladeRunnerMetaEngine : public AdvancedMetaEngine {
 public:
-	BladeRunnerMetaEngine() : AdvancedMetaEngine(BladeRunner::gameDescriptions, sizeof(BladeRunner::gameDescriptions[0]), BladeRunner::bladeRunnerGames) {
-	}
+	BladeRunnerMetaEngine();
 
-	virtual const char *getName() const {
-		return "Blade Runner Engine";
-	}
+	const char *getName() const override;
+	const char *getOriginalCopyright() const override;
+	bool createInstance(OSystem *syst, Engine **engine, const ADGameDescription *desc) const override;
+	bool hasFeature(MetaEngineFeature f) const override;
+	SaveStateList listSaves(const char *target) const override;
+	int getMaximumSaveSlot() const override;
+	void removeSaveState(const char *target, int slot) const override;
+	SaveStateDescriptor querySaveMetaInfos(const char *target, int slot) const override;
+};
 
-	virtual const char *getOriginalCopyright() const {
-		return "Blade Runner (C) Westwood Studios.";
-	}
+BladeRunnerMetaEngine::BladeRunnerMetaEngine()
+	: AdvancedMetaEngine(
+		BladeRunner::gameDescriptions,
+		sizeof(BladeRunner::gameDescriptions[0]),
+		BladeRunner::bladeRunnerGames) {}
 
-	virtual bool createInstance(OSystem *syst, Engine **engine, const ADGameDescription *desc) const;
-};
+
+const char *BladeRunnerMetaEngine::getName() const {
+	return "Blade Runner Engine";
+}
+
+const char *BladeRunnerMetaEngine::getOriginalCopyright() const {
+	return "Blade Runner (C) 1997 Westwood Studios";
+}
 
 bool BladeRunnerMetaEngine::createInstance(OSystem *syst, Engine **engine, const ADGameDescription *desc) const {
 	*engine = new BladeRunner::BladeRunnerEngine(syst, desc);
@@ -58,6 +76,71 @@ bool BladeRunnerMetaEngine::createInstance(OSystem *syst, Engine **engine, const
 	return true;
 }
 
+bool BladeRunnerMetaEngine::hasFeature(MetaEngineFeature f) const {
+	return
+		f == kSupportsListSaves ||
+		f == kSupportsLoadingDuringStartup ||
+		f == kSupportsDeleteSave ||
+		f == kSavesSupportMetaInfo ||
+		f == kSavesSupportThumbnail ||
+		f == kSimpleSavesNames;
+}
+
+SaveStateList BladeRunnerMetaEngine::listSaves(const char *target) const {
+	Common::SaveFileManager *saveFileMan = g_system->getSavefileManager();
+	Common::StringArray files = saveFileMan->listSavefiles(Common::String::format("%s.###", target));
+
+	SaveStateList saveList;
+	for (Common::StringArray::const_iterator fileName = files.begin(); fileName != files.end(); ++fileName) {
+		Common::InSaveFile *saveFile = saveFileMan->openForLoading(*fileName);
+		if (saveFile == nullptr || saveFile->err()) {
+			warning("Cannot open save file '%s'", fileName->c_str());
+			continue;
+		}
+
+		BladeRunner::SaveFileHeader header;
+		BladeRunner::SaveFile::readHeader(*saveFile, header);
+
+		int slotNum = atoi(fileName->c_str() + fileName->size() - 3);
+		saveList.push_back(SaveStateDescriptor(slotNum, header._name));
+	}
+
+	// Sort saves based on slot number.
+	Common::sort(saveList.begin(), saveList.end(), SaveStateDescriptorSlotComparator());
+	return saveList;
+}
+
+int BladeRunnerMetaEngine::getMaximumSaveSlot() const {
+	return 999;
+}
+
+void BladeRunnerMetaEngine::removeSaveState(const char *target, int slot) const {
+	Common::String filename = Common::String::format("%s.%03d", target, slot);
+	g_system->getSavefileManager()->removeSavefile(filename);
+}
+
+SaveStateDescriptor BladeRunnerMetaEngine::querySaveMetaInfos(const char *target, int slot) const {
+	Common::String filename = Common::String::format("%s.%03d", target, slot);
+	Common::InSaveFile *saveFile = g_system->getSavefileManager()->openForLoading(filename);
+
+	if (saveFile == nullptr || saveFile->err()) {
+		return SaveStateDescriptor();
+	}
+
+	BladeRunner::SaveFileHeader header;
+	if (!BladeRunner::SaveFile::readHeader(*saveFile, header, false)) {
+		delete saveFile;
+		return SaveStateDescriptor();
+	}
+	delete saveFile;
+
+	SaveStateDescriptor desc(slot, header._name);
+	desc.setThumbnail(header._thumbnail);
+	desc.setSaveDate(header._year, header._month, header._day);
+	desc.setSaveTime(header._hour, header._minute);
+	return desc;
+}
+
 #if PLUGIN_ENABLED_DYNAMIC(BLADERUNNER)
 	REGISTER_PLUGIN_DYNAMIC(BLADERUNNER, PLUGIN_TYPE_ENGINE, BladeRunnerMetaEngine);
 #else