From 184b3a166217ba5c0ea3eddd3e01798d8e752417 Mon Sep 17 00:00:00 2001
From: Thierry Crozat
Date: Sat, 30 Sep 2017 23:26:06 +0100
Subject: SUPERNOVA: Load strings from the supernova.dat file

---
 engines/supernova/supernova.cpp | 65 +++++++++++++++++++++++++++++++++++++++++
 engines/supernova/supernova.h   |  9 ++++++
 2 files changed, 74 insertions(+)

diff --git a/engines/supernova/supernova.cpp b/engines/supernova/supernova.cpp
index 7fb95c507c..67c6fdd96c 100644
--- a/engines/supernova/supernova.cpp
+++ b/engines/supernova/supernova.cpp
@@ -33,6 +33,7 @@
 #include "common/savefile.h"
 #include "common/str.h"
 #include "common/system.h"
+#include "common/translation.h"
 #include "engines/util.h"
 #include "graphics/cursorman.h"
 #include "graphics/surface.h"
@@ -138,6 +139,11 @@ SupernovaEngine::~SupernovaEngine() {
 
 Common::Error SupernovaEngine::run() {
 	initGraphics(_screenWidth, _screenHeight);
+
+	Common::Error status = loadGameStrings();
+	if (status.getCode() != Common::kNoError)
+		return status;
+
 	_gm = new GameManager(this);
 	_console = new Console(this, _gm);
 
@@ -243,6 +249,65 @@ void SupernovaEngine::pauseTimer(bool pause) {
 	}
 }
 
+Common::Error SupernovaEngine::loadGameStrings() {
+	Common::String cur_lang = ConfMan.get("language");
+	Common::String string_id("TEXT");
+
+	// Note: we don't print any warning or errors here if we cannot find the file
+	// or the format is not as expected. We will get those warning when reading the
+	// strings anyway (actually the engine will even refuse to start).
+	Common::File f;
+	if (!f.open(SUPERNOVA_DAT)) {
+		Common::String msg = Common::String::format(_("Unable to locate the '%s' engine data file."), SUPERNOVA_DAT);
+		GUIErrorMessage(msg);
+		return Common::kReadingFailed;
+	}
+
+	// Validate the data file header
+	char id[5], lang[5];
+	id[4] = lang[4] = '\0';
+	f.read(id, 3);
+	if (strncmp(id, "MSN", 3) != 0) {
+		Common::String msg = Common::String::format(_("The '%s' engine data file is corrupt."), SUPERNOVA_DAT);
+		GUIErrorMessage(msg);
+		return Common::kReadingFailed;
+	}
+		
+	int version = f.readByte();
+	if (version != SUPERNOVA_DAT_VERSION) {
+		Common::String msg = Common::String::format(
+			_("Incorrect version of the '%s' engine data file found. Expected %d but got %d."),
+			SUPERNOVA_DAT, SUPERNOVA_DAT_VERSION, version);
+		GUIErrorMessage(msg);
+		return Common::kReadingFailed;
+	}
+
+	while (!f.eos()) {
+		f.read(id, 4);
+		f.read(lang, 4);
+		uint32 size = f.readUint32LE();
+		if (f.eos())
+			break;
+		if (string_id == id && cur_lang == lang) {
+			while (size > 0) {
+				Common::String s;
+				char ch;
+				while ((ch = (char)f.readByte()) != '\0')
+					s += ch;
+				_gameStrings.push_back(s);
+				size -= s.size() + 1;
+			}
+			return Common::kNoError;
+		} else
+			f.skip(size);
+	}
+
+	Common::Language l = Common::parseLanguage(cur_lang);
+	Common::String msg = Common::String::format(_("Unable to locate the text for %s language in '%s' engine data file."), Common::getLanguageDescription(l), SUPERNOVA_DAT);
+	GUIErrorMessage(msg);
+	return Common::kReadingFailed;
+}
+
 void SupernovaEngine::initData() {
 	// Images
 	for (int i = 0; i < 44; ++i)
diff --git a/engines/supernova/supernova.h b/engines/supernova/supernova.h
index a1a682d02f..356cfe482c 100644
--- a/engines/supernova/supernova.h
+++ b/engines/supernova/supernova.h
@@ -104,6 +104,8 @@ public:
 	int _screenHeight;
 	bool _allowLoadGame;
 	bool _allowSaveGame;
+	Common::StringArray _gameStrings;
+	Common::String _nullString;
 
 	byte _imageIndex;
 	byte _sectionIndex;
@@ -120,6 +122,7 @@ public:
 	void pauseTimer(bool pause);
 	int  textWidth(const char *text);
 	int  textWidth(const uint16 key);
+	Common::Error loadGameStrings();
 	void initData();
 	void initPalette();
 	void paletteFadeIn();
@@ -146,6 +149,12 @@ public:
 	bool loadGame(int slot);
 	bool saveGame(int slot, const Common::String &description);
 
+	const Common::String &getGameString(int idx) const {
+		if (idx < 0 || idx >= _gameStrings.size())
+			return _nullString;
+		return _gameStrings[idx];
+	}
+
 	Common::MemoryReadStream *convertToMod(const char *filename, int version = 1);
 
 	virtual Common::Error loadGameState(int slot);
-- 
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