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

/* libwpd

 * 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) 2002 William Lachance (wrlach@gmail.com)

 * Copyright (C) 2002-2004 Marc Maurer (uwog@uwog.net)

 *

 * 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://libwpd.sourceforge.net

 */

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

 * Corel Corporation or Corel Corporation Limited."

 */

#include "WPXHeader.h"

#include "WP3Header.h"

#include "WP5Header.h"

#include "WP6Header.h"

#include "WP60Header.h"

#include "WP61Header.h"

#include "WPXFileStructure.h"

#include "libwpd_internal.h"

#include <string.h>

WPXHeader::WPXHeader(librevenge::RVNGInputStream * /* input */, WPXEncryption * /* encryption */, unsigned documentOffset, unsigned char productType,

                     unsigned char fileType, unsigned char majorVersion, unsigned char minorVersion, unsigned short documentEncryption) :

  m_documentOffset(documentOffset),

  m_productType(productType),

  m_fileType(fileType),

  m_majorVersion(majorVersion),

  m_minorVersion(minorVersion),

  m_documentEncryption(documentEncryption)

{

}

WPXHeader::~WPXHeader()

{

}

WPXHeader *WPXHeader::constructHeader(librevenge::RVNGInputStream *input, WPXEncryption *encryption)

{

  WPD_DEBUG_MSG(("WPXHeader::constructHeader()\n"));

  char fileMagic[4] = { 0, 0, 0, 0 };

  /* check the magic */

  input->seek(WPX_HEADER_MAGIC_OFFSET, librevenge::RVNG_SEEK_SET);

  for (int i=0; i<3 && !input->isEnd(); i++)

    fileMagic[i] = (char)readU8(input, encryption);

  if (strcmp(fileMagic, "WPC"))

  {

    WPD_DEBUG_MSG(("WordPerfect: File magic is not equal to \"WPC\"!\n"));

    return nullptr;

  }

  /* get the document pointer */

  input->seek(WPX_HEADER_DOCUMENT_POINTER_OFFSET, librevenge::RVNG_SEEK_SET);

  unsigned documentOffset = readU32(input, encryption);

  /* get information on product types, file types, versions */

  input->seek(WPX_HEADER_PRODUCT_TYPE_OFFSET, librevenge::RVNG_SEEK_SET);

  unsigned char productType = readU8(input, encryption);

  unsigned char fileType = readU8(input, encryption);

  unsigned char majorVersion = readU8(input, encryption);

  unsigned char minorVersion = readU8(input, encryption);

  input->seek(WPX_HEADER_ENCRYPTION_OFFSET, librevenge::RVNG_SEEK_SET);

  unsigned short documentEncryption = readU16(input, encryption);

  WPD_DEBUG_MSG(("WordPerfect: Document Offset = 0x%x \n",documentOffset));

  WPD_DEBUG_MSG(("WordPerfect: Product Type: %i File Type: %i Major Version: %i Minor Version: %i\n",

                 productType, fileType,

                 majorVersion, minorVersion));

  WPD_DEBUG_MSG(("WordPerfect: Document Encryption = 0x%x \n",(int)documentEncryption));

  switch (fileType)

  {

  case 0x0a:

    WPD_DEBUG_MSG(("WordPerfect: Supported file type: \"WordPerfect Document\"\n"));

    switch (majorVersion)

    {

    case 0x00: // WP5

      documentEncryption = (unsigned short)(((documentEncryption & 0xff00) >> 8) | ((documentEncryption & 0x00ff) << 8));

      return new WP5Header(input, encryption, documentOffset, productType, fileType,

                           majorVersion, minorVersion, documentEncryption);

    case 0x02: // WP6

      switch (minorVersion)

      {

      case 0x00:

        return new WP60Header(input, encryption, documentOffset, productType, fileType,

                              majorVersion, minorVersion, documentEncryption);

      default: // assume this header can be parsed by a WP61 header parser

        return new WP61Header(input, encryption, documentOffset, productType, fileType,

                              majorVersion, minorVersion, documentEncryption);

      }

    default:

      // unhandled file format

      WPD_DEBUG_MSG(("WordPerfect: Unsupported major number: %d\n", majorVersion));

      return nullptr;

    }

  case 0x2c:

    WPD_DEBUG_MSG(("WordPerfect: Supported file type: \"MAC WP 2.0 document\"\n"));

    switch (majorVersion)

    {

    case 0x02: // WP Mac 2.x

    case 0x03: // WP Mac 3.0-3.5

    case 0x04: // WP Mac 3.5e

      return new WP3Header(input, encryption, documentOffset, productType, fileType,

                           majorVersion, minorVersion, documentEncryption);

    default:

      // unhandled file format

      WPD_DEBUG_MSG(("WordPerfect: Unsupported major number: %d\n", majorVersion));

      return nullptr;

    }

  default:

    WPD_DEBUG_MSG(("WordPerfect: Unsupported file type: %d\n", fileType));

    return nullptr;

  }

}

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