/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */

/* libwpg

 * Version: MPL 2.0 / LGPLv2.1+

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 * Major Contributor(s):

 * Copyright (C) 2006 Ariya Hidayat (ariya@kde.org)

 * Copyright (C) 2004 Marc Oude Kotte (marc@solcon.nl)

 *

 * For minor contributions see the git repository.

 *

 * Alternatively, the contents of this file may be used under the terms

 * of the GNU Lesser General Public License Version 2.1 or later

 * (LGPLv2.1+), in which case the provisions of the LGPLv2.1+ are

 * applicable instead of those above.

 *

 * For further information visit http://libwpg.sourceforge.net

 */

/* "This product is not manufactured, approved, or supported by

 * Corel Corporation or Corel Corporation Limited."

 */

#include "WPGHeader.h"

#include "libwpg_utils.h"

namespace

{

static inline unsigned short readU16(const void *p)

{

	const unsigned char *ptr = (const unsigned char *) p;

	return (unsigned short)(ptr[0]+(ptr[1]<<8));

}

static inline unsigned long readU32(const void *p)

{

	const unsigned char *ptr = (const unsigned char *) p;

	return (unsigned long)(unsigned)(ptr[0]+(ptr[1]<<8)+(ptr[2]<<16)+(ptr[3]<<24));

}

}

WPGHeader::WPGHeader() :

	m_identifier(),

	m_startOfDocument(0L),

	m_productType(0x01),

	m_fileType(0x16),

	m_majorVersion(0x02),

	m_minorVersion(0x00),

	m_encryptionKey(0x00),

	m_startOfPacketData(0)

{

	m_identifier[0] = 0xff;

	m_identifier[1] = 'W';

	m_identifier[2] = 'P';

	m_identifier[3] = 'C';

}

bool WPGHeader::load(librevenge::RVNGInputStream *input)

{

//	input->seek(0, librevenge::RVNG_SEEK_SET);

	unsigned long n = 0;

	unsigned char const *prefix = input->read(26, n);

	if (n < 26)

		return false;

	m_identifier[0] = prefix[0];

	m_identifier[1] = prefix[1];

	m_identifier[2] = prefix[2];

	m_identifier[3] = prefix[3];

	m_startOfDocument = readU32(prefix+4);

	m_productType = prefix[8];

	m_fileType = prefix[9];

	m_majorVersion = prefix[10];

	m_minorVersion = prefix[11];

	m_encryptionKey = readU16(prefix+12);

	m_startOfPacketData = readU16(prefix+14);

	WPG_DEBUG_MSG(("Header Identifier  = %c%c%c\n", m_identifier[1],

	               m_identifier[2], m_identifier[3]));

	WPG_DEBUG_MSG(("Product type       = 0x%x\n",  m_productType));

	WPG_DEBUG_MSG(("File type          = 0x%x\n",  m_fileType));

	WPG_DEBUG_MSG(("Major version      = 0x%x\n",  m_majorVersion));

	WPG_DEBUG_MSG(("Minor version      = 0x%x\n",  m_minorVersion));

	WPG_DEBUG_MSG(("Encryption key     = 0x%x\n",  m_encryptionKey));

	return true;

}

bool WPGHeader::isSupported() const

{

	return (

	           (m_identifier[0] == 0xFF) &&

	           (m_identifier[1] == 'W') &&

	           (m_identifier[2] == 'P') &&

	           (m_identifier[3] == 'C') &&

	           (m_productType == 0x01) &&

	           (m_fileType == 0x16) &&

	           (m_encryptionKey == 0x00) &&     // we don't support encryption

	           ((m_majorVersion == 0x02) || (m_majorVersion == 0x01)) &&

	           (m_minorVersion == 0x00)

	       );

}

unsigned long WPGHeader::startOfDocument() const

{

	return m_startOfDocument;

}

int WPGHeader::majorVersion() const

{

	return m_majorVersion;

}

/* vim:set shiftwidth=4 softtabstop=4 noexpandtab: */