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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program 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.
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
/*
* This code is based on Broken Sword 2.5 engine
*
* Copyright (c) Malte Thiesen, Daniel Queteschiner and Michael Elsdoerfer
*
* Licensed under GNU GPL v2
*
*/
// -----------------------------------------------------------------------------
// Includes
// -----------------------------------------------------------------------------
#include "sword25/gfx/image/b25sloader.h"
#include "sword25/gfx/image/pngloader.h"
namespace Sword25 {
#define BS_LOG_PREFIX "B25SLOADER"
// -----------------------------------------------------------------------------
namespace {
static Common::String LoadString(Common::ReadStream &In, uint MaxSize = 999) {
Common::String Result;
while (!In.eos() && (Result.size() < MaxSize)) {
char ch = (char)In.readByte();
if ((ch == '\0') || (ch == ' '))
break;
Result += ch;
}
return Result;
}
uint FindEmbeddedPNG(const byte *FileDataPtr, uint FileSize) {
assert(FileSize >= 100);
if (memcmp(FileDataPtr, "BS25SAVEGAME", 12))
return 0;
// Read in the header
Common::MemoryReadStream stream(FileDataPtr, FileSize);
stream.seek(0, SEEK_SET);
// Headerinformationen der Spielstandes einlesen.
uint compressedGamedataSize;
LoadString(stream);
LoadString(stream);
Common::String gameSize = LoadString(stream);
compressedGamedataSize = atoi(gameSize.c_str());
LoadString(stream);
// Return the offset of where the thumbnail starts
return static_cast<uint>(stream.pos() + compressedGamedataSize);
}
}
// -----------------------------------------------------------------------------
bool B25SLoader::IsCorrectImageFormat(const byte *FileDataPtr, uint FileSize) {
// PNG innerhalb des Spielstandes finden und den Methodenaufruf zu BS_PNGLoader weiterreichen.
uint PNGOffset = FindEmbeddedPNG(FileDataPtr, FileSize);
if (PNGOffset > 0) {
return PNGLoader::DoIsCorrectImageFormat(FileDataPtr + PNGOffset, FileSize - PNGOffset);
}
return false;
}
// -----------------------------------------------------------------------------
bool B25SLoader::DecodeImage(const byte *FileDataPtr, uint FileSize, GraphicEngine::COLOR_FORMATS ColorFormat, byte *&UncompressedDataPtr,
int &Width, int &Height, int &Pitch) {
// PNG innerhalb des Spielstandes finden und den Methodenaufruf zu BS_PNGLoader weiterreichen.
uint PNGOffset = FindEmbeddedPNG(FileDataPtr, FileSize);
if (PNGOffset > 0) {
return PNGLoader::DoDecodeImage(FileDataPtr + PNGOffset, FileSize - PNGOffset, ColorFormat, UncompressedDataPtr, Width, Height, Pitch);
}
return false;
}
// -----------------------------------------------------------------------------
bool B25SLoader::ImageProperties(const byte *FileDataPtr, uint FileSize, GraphicEngine::COLOR_FORMATS &ColorFormat, int &Width, int &Height) {
// PNG innerhalb des Spielstandes finden und den Methodenaufruf zu BS_PNGLoader weiterreichen.
uint PNGOffset = FindEmbeddedPNG(FileDataPtr, FileSize);
if (PNGOffset > 0) {
return PNGLoader::DoImageProperties(FileDataPtr + PNGOffset, FileSize - PNGOffset, ColorFormat, Width, Height);
}
return false;
}
} // End of namespace Sword25
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