/* 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
 *
 */

// -----------------------------------------------------------------------------
// Logging
// -----------------------------------------------------------------------------

#define BS_LOG_PREFIX "MOVIEFILE"

// -----------------------------------------------------------------------------
// Includes
// -----------------------------------------------------------------------------

#include "sword25/kernel/kernel.h"
#include "sword25/package/packagemanager.h"
#include "sword25/fmv/oggtheora/oggstate.h"
#include "sword25/fmv/oggtheora/moviefile.h"

namespace Sword25 {

// -----------------------------------------------------------------------------

MovieFile::MovieFile(const Common::String &Filename, unsigned int ReadBlockSize, bool &Success) :
	m_Data(0), m_Size(0), m_ReadPos(0), m_ReadBlockSize(ReadBlockSize) {
	m_Data = reinterpret_cast<char *>(Kernel::GetInstance()->GetPackage()->GetFile(Filename, &m_Size));
	if (!m_Data) {
		BS_LOG_ERRORLN("Could not load movie file \"%s\".", Filename.c_str());
		Success = false;
	} else
		Success = true;
}

// -----------------------------------------------------------------------------

MovieFile::~MovieFile() {
	if (m_Data) delete [] m_Data;
}

// -----------------------------------------------------------------------------

int MovieFile::BufferData(OggState &OggState) {
	if (!m_Data || !m_Size || m_ReadPos >= m_Size) {
		BS_LOG_ERRORLN("Tried to read past the movie buffer's end.");
		return 0;
	}

	// just grab some more compressed bitstream and sync it for page extraction 
	char *Buffer = OggState.SyncBuffer(m_ReadBlockSize);
	if (!Buffer) {
		BS_LOG_ERRORLN("ogg_sync_buffer() failed.");
		return 0;
	}

	// Feststellen wie viele Bytes kopiert werden sollen, maximal READ_BLOCK_SIZE, weniger falls das Ende der Daten erreicht ist.
	int Bytes = (m_Size - m_ReadPos) > m_ReadBlockSize ? m_ReadBlockSize : m_Size - m_ReadPos;
	memcpy(Buffer, &m_Data[m_ReadPos], Bytes);
	m_ReadPos += Bytes;

	OggState.SyncWrote(Bytes);

	return Bytes;
}

// -----------------------------------------------------------------------------

bool MovieFile::IsEOF() const {
	return m_ReadPos >= m_Size;
}

} // End of namespace Sword25