1 files changed, 101 insertions, 0 deletions
diff --git a/engines/sword25/gfx/image/b25sloader.cpp b/engines/sword25/gfx/image/b25sloader.cpp
new file mode 100755
index 0000000000..55aaf7a2c5
--- /dev/null
+++ b/engines/sword25/gfx/image/b25sloader.cpp
@@ -0,0 +1,101 @@
+// -----------------------------------------------------------------------------
+// This file is part of Broken Sword 2.5
+// Copyright (c) Malte Thiesen, Daniel Queteschiner and Michael Elsdörfer
+//
+// Broken Sword 2.5 is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// Broken Sword 2.5 is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Broken Sword 2.5; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+// -----------------------------------------------------------------------------
+
+// -----------------------------------------------------------------------------
+// Includes
+// -----------------------------------------------------------------------------
+
+#include <string>
+#include <sstream>
+#include <algorithm>
+using namespace std;
+
+#include "b25sloader.h"
+#include "pngloader.h"
+
+#define BS_LOG_PREFIX "B25SLOADER"
+
+// -----------------------------------------------------------------------------
+
+namespace
+{
+	unsigned int FindEmbeddedPNG(const char * FileDataPtr, unsigned int FileSize)
+	{
+		// Einen Stringstream mit dem Anfang der Datei intialisieren. 512 Byte sollten hierfür genügen.
+		istringstream StringStream(string(FileDataPtr, FileDataPtr + min(static_cast<unsigned int>(512), FileSize)));
+
+		// Headerinformationen der Spielstandes einlesen.
+		string Marker, VersionID;
+		unsigned int CompressedGamedataSize, UncompressedGamedataSize;
+		StringStream >> Marker >> VersionID >> CompressedGamedataSize >> UncompressedGamedataSize;
+		if (!StringStream.good()) return 0;
+
+		// Testen, ob wir tatsächlich einen Spielstand haben.
+		if (Marker == "BS25SAVEGAME")
+		{
+			// Offset zum PNG innerhalb des Spielstandes berechnen und zurückgeben.
+			return static_cast<unsigned int>(StringStream.tellg()) + CompressedGamedataSize + 1;
+		}
+
+		return 0;
+	}
+}
+
+// -----------------------------------------------------------------------------
+
+bool BS_B25SLoader::IsCorrectImageFormat(const char * FileDataPtr, unsigned int FileSize)
+{
+	// PNG innerhalb des Spielstandes finden und den Methodenaufruf zu BS_PNGLoader weiterreichen.
+	unsigned int PNGOffset = FindEmbeddedPNG(FileDataPtr, FileSize);
+	if (PNGOffset > 0)
+	{
+		return BS_PNGLoader::DoIsCorrectImageFormat(FileDataPtr + PNGOffset, FileSize - PNGOffset);
+	}
+
+	return false;
+}
+
+// -----------------------------------------------------------------------------
+
+bool BS_B25SLoader::DecodeImage(const char * FileDataPtr, unsigned int FileSize, BS_GraphicEngine::COLOR_FORMATS ColorFormat, char * & UncompressedDataPtr,
+								int & Width, int & Height, int & Pitch)
+{
+	// PNG innerhalb des Spielstandes finden und den Methodenaufruf zu BS_PNGLoader weiterreichen.
+	unsigned int PNGOffset = FindEmbeddedPNG(FileDataPtr, FileSize);
+	if (PNGOffset > 0)
+	{
+		return BS_PNGLoader::DoDecodeImage(FileDataPtr + PNGOffset, FileSize - PNGOffset, ColorFormat, UncompressedDataPtr, Width, Height, Pitch);
+	}
+
+	return false;
+}
+
+// -----------------------------------------------------------------------------
+
+bool BS_B25SLoader::ImageProperties(const char * FileDataPtr, unsigned int FileSize, BS_GraphicEngine::COLOR_FORMATS & ColorFormat, int & Width, int & Height)
+{
+	// PNG innerhalb des Spielstandes finden und den Methodenaufruf zu BS_PNGLoader weiterreichen.
+	unsigned int PNGOffset = FindEmbeddedPNG(FileDataPtr, FileSize);
+	if (PNGOffset > 0)
+	{
+		return BS_PNGLoader::DoImageProperties(FileDataPtr + PNGOffset, FileSize - PNGOffset, ColorFormat, Width, Height);
+	}
+
+	return false;
+}