MADS: Implemented savegame header read/writes

5 files changed, 164 insertions, 15 deletions

diff --git a/engines/mads/detection.cpp b/engines/mads/detection.cpp
index 015859f827..b8e75b4393 100644
--- a/engines/mads/detection.cpp
+++ b/engines/mads/detection.cpp
@@ -31,6 +31,7 @@
 #include "common/system.h"
 #include "graphics/colormasks.h"
 #include "graphics/surface.h"
+#include "mads/game.h"
 
 #define MAX_SAVES 99
 
@@ -124,6 +125,7 @@ SaveStateList MADSMetaEngine::listSaves(const char *target) const {
 	Common::StringArray filenames;
 	Common::String saveDesc;
 	Common::String pattern = Common::String::format("%s.0??", target);
+	MADS::MADSSavegameHeader header;
 
 	filenames = saveFileMan->listSavefiles(pattern);
 	sort(filenames.begin(), filenames.end());   // Sort to get the files in numerical order
@@ -137,6 +139,11 @@ SaveStateList MADSMetaEngine::listSaves(const char *target) const {
 			Common::InSaveFile *in = g_system->getSavefileManager()->openForLoading(*file);
 
 			if (in) {
+				MADS::Game::readSavegameHeader(in, header);
+				saveList.push_back(SaveStateDescriptor(slot, header._saveName));
+
+				header._thumbnail->free();
+				delete header._thumbnail;
 				delete in;
 			}
 		}
diff --git a/engines/mads/game.cpp b/engines/mads/game.cpp
index 9c124aa6a6..50c3ccd916 100644
--- a/engines/mads/game.cpp
+++ b/engines/mads/game.cpp
@@ -21,8 +21,12 @@
  */
 
 #include "common/scummsys.h"
+#include "common/config-manager.h"
 #include "common/memstream.h"
 #include "common/serializer.h"
+#include "graphics/palette.h"
+#include "graphics/scaler.h"
+#include "graphics/thumbnail.h"
 #include "mads/mads.h"
 #include "mads/compression.h"
 #include "mads/game.h"
@@ -46,6 +50,7 @@ Game::Game(MADSEngine *vm): _vm(vm), _surface(nullptr), _objects(vm),
 		_scene(vm), _screenObjects(vm), _player(vm) {
 	_sectionNumber = _priorSectionNumber = 0;
 	_difficulty = DIFFICULTY_HARD;
+	_loadGameSlot = -1;
 	_serializer = nullptr;
 	_statusFlag = 0;
 	_sectionHandler = nullptr;
@@ -81,22 +86,33 @@ Game::~Game() {
 void Game::run() {
 	initialiseGlobals();
 
+	// If requested, load a savegame instead of showing the intro
+	if (ConfMan.hasKey("save_slot")) {
+		int saveSlot = ConfMan.getInt("save_slot");
+		if (saveSlot >= 0 && saveSlot <= 999)
+			_loadGameSlot = saveSlot;
+	}
+
 	_statusFlag = true;
-	int protectionResult = checkCopyProtection();
-	switch (protectionResult) {
-	case PROTECTION_FAIL:
-		// Copy protection failed
-		_scene._nextSceneId = 804;
-		break;
-	case PROTECTION_ESCAPE:
-		// User escaped out of copy protection dialog
-		_vm->quitGame();
-		break;
-	default:
-		// Copy protection check succeeded
-		_scene._nextSceneId = 103;
-		_scene._priorSceneId = 102;
-		break;
+	int protectionResult = -1;
+	
+	if (_loadGameSlot == -1) {
+		protectionResult = checkCopyProtection();
+		switch (protectionResult) {
+		case PROTECTION_FAIL:
+			// Copy protection failed
+			_scene._nextSceneId = 804;
+			break;
+		case PROTECTION_ESCAPE:
+			// User escaped out of copy protection dialog
+			_vm->quitGame();
+			break;
+		default:
+			// Copy protection check succeeded
+			_scene._nextSceneId = 103;
+			_scene._priorSceneId = 102;
+			break;
+		}
 	}
 
 	// Get the initial starting time for the first scene
@@ -422,4 +438,80 @@ void Game::synchronize(Common::Serializer &s, bool phase1) {
 	}
 }
 
+void Game::loadGame(int slotNumber) {
+
+}
+
+void Game::saveGame(int slotNumber, const Common::String &saveName) {
+
+}
+
+const char *const SAVEGAME_STR = "MADS";
+#define SAVEGAME_STR_SIZE 4
+
+bool Game::readSavegameHeader(Common::InSaveFile *in, MADSSavegameHeader &header) {
+	char saveIdentBuffer[SAVEGAME_STR_SIZE + 1];
+	header._thumbnail = NULL;
+
+	// Validate the header Id
+	in->read(saveIdentBuffer, SAVEGAME_STR_SIZE + 1);
+	if (strncmp(saveIdentBuffer, SAVEGAME_STR, SAVEGAME_STR_SIZE))
+		return false;
+
+	header._version = in->readByte();
+	if (header._version > MADS_SAVEGAME_VERSION)
+		return false;
+
+	// Read in the string
+	header._saveName.clear();
+	char ch;
+	while ((ch = (char)in->readByte()) != '\0') header._saveName += ch;
+
+	// Get the thumbnail
+	header._thumbnail = Graphics::loadThumbnail(*in);
+	if (!header._thumbnail)
+		return false;
+
+	// Read in save date/time
+	header._year = in->readSint16LE();
+	header._month = in->readSint16LE();
+	header._day = in->readSint16LE();
+	header._hour = in->readSint16LE();
+	header._minute = in->readSint16LE();
+	header._totalFrames = in->readUint32LE();
+
+	return true;
+}
+
+void Game::writeSavegameHeader(Common::OutSaveFile *out, MADSSavegameHeader &header) {
+	// Write out a savegame header
+	out->write(SAVEGAME_STR, SAVEGAME_STR_SIZE + 1);
+
+	out->writeByte(MADS_SAVEGAME_VERSION);
+
+	// Write savegame name
+	out->write(header._saveName.c_str(), header._saveName.size() + 1);
+
+	// Get the active palette
+	uint8 thumbPalette[256 * 3];
+	g_system->getPaletteManager()->grabPalette(thumbPalette, 0, 256);
+
+	// Create a thumbnail and save it
+	Graphics::Surface *thumb = new Graphics::Surface();
+	::createThumbnail(thumb, _vm->_screen.getData(), MADS_SCREEN_WIDTH, MADS_SCREEN_HEIGHT, thumbPalette);
+	Graphics::saveThumbnail(*out, *thumb);
+	thumb->free();
+	delete thumb;
+
+	// Write out the save date/time
+	TimeDate td;
+	g_system->getTimeAndDate(td);
+	out->writeSint16LE(td.tm_year + 1900);
+	out->writeSint16LE(td.tm_mon + 1);
+	out->writeSint16LE(td.tm_mday);
+	out->writeSint16LE(td.tm_hour);
+	out->writeSint16LE(td.tm_min);
+	out->writeUint32LE(_vm->_events->getFrameCounter());
+}
+
 } // End of namespace MADS
diff --git a/engines/mads/game.h b/engines/mads/game.h
index ad40fbdcc0..8334d94256 100644
--- a/engines/mads/game.h
+++ b/engines/mads/game.h
@@ -24,6 +24,7 @@
 #define MADS_GAME_H
 
 #include "common/scummsys.h"
+#include "common/savefile.h"
 #include "common/str-array.h"
 #include "common/serializer.h"
 #include "mads/scene.h"
@@ -54,6 +55,17 @@ enum ProtectionResult {
 	PROTECTION_SUCCEED = 0, PROTECTION_FAIL = 1, PROTECTION_ESCAPE = 2
 };
 
+#define MADS_SAVEGAME_VERSION 1
+
+struct MADSSavegameHeader {
+	uint8 _version;
+	Common::String _saveName;
+	Graphics::Surface *_thumbnail;
+	int _year, _month, _day;
+	int _hour, _minute;
+	int _totalFrames;
+};
+
 class Game {
 private:
 	/**
@@ -78,6 +90,8 @@ protected:
 	bool _quoteEmergency;
 	bool _vocabEmergency;
 	bool _anyEmergency;
+	int _loadGameSlot;
+	Common::String _saveName;
 	Common::Serializer *_serializer;
 
 	/**
@@ -188,6 +202,28 @@ public:
 	* Handle a keyboard event
 	*/
 	void handleKeypress(const Common::Event &event);
+
+	/**
+	 * Starts a savegame loading.
+	 * @remarks	Due to the way the engine is implemented, loading is done in two
+	 * parts, the second part after the specific scene has been loaded
+	 */
+	void loadGame(int slotNumber);
+
+	/**
+	 * Save the current game
+	 */
+	void saveGame(int slotNumber, const Common::String &saveName);
+
+	/**
+	 * Write out a savegame header
+	 */
+	void writeSavegameHeader(Common::OutSaveFile *out, MADSSavegameHeader &header);
+
+	/**
+	 * Read in a savegame header
+	 */
+	static bool readSavegameHeader(Common::InSaveFile *in, MADSSavegameHeader &header);
 };
 
 } // End of namespace MADS
diff --git a/engines/mads/mads.cpp b/engines/mads/mads.cpp
index 6f57b1df60..1df41ad3fd 100644
--- a/engines/mads/mads.cpp
+++ b/engines/mads/mads.cpp
@@ -130,4 +130,12 @@ bool MADSEngine::canSaveGameStateCurrently() {
 		&& _dialogs->_pendingDialog == DIALOG_NONE;
 }
 
+/**
+* Support method that generates a savegame name
+* @param slot		Slot number
+*/
+Common::String MADSEngine::generateSaveName(int slot) {
+	return Common::String::format("%s.%03d", _targetName.c_str(), slot);
+}
+
 } // End of namespace MADS
diff --git a/engines/mads/mads.h b/engines/mads/mads.h
index f13b3b9008..8a4b7f64d1 100644
--- a/engines/mads/mads.h
+++ b/engines/mads/mads.h
@@ -129,6 +129,12 @@ public:
 	* Returns true if it is currently okay to save the game
 	*/
 	bool canSaveGameStateCurrently();
+
+	/**
+	* Support method that generates a savegame name
+	* @param slot		Slot number
+	*/
+	Common::String generateSaveName(int slot);
 };
 
 } // End of namespace MADS