//C-  -*- C++ -*-

//C- -------------------------------------------------------------------

//C- DjVuLibre-3.5

//C- Copyright (c) 2002  Leon Bottou and Yann Le Cun.

//C- Copyright (c) 2001  AT&T

//C-

//C- This software is subject to, and may be distributed under, the

//C- GNU General Public License, either Version 2 of the license,

//C- or (at your option) any later version. The license should have

//C- accompanied the software or you may obtain a copy of the license

//C- from the Free Software Foundation at http://www.fsf.org .

//C-

//C- This program is distributed in the hope that it will be useful,

//C- but WITHOUT ANY WARRANTY; without even the implied warranty of

//C- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

//C- GNU General Public License for more details.

//C- 

//C- DjVuLibre-3.5 is derived from the DjVu(r) Reference Library from

//C- Lizardtech Software.  Lizardtech Software has authorized us to

//C- replace the original DjVu(r) Reference Library notice by the following

//C- text (see doc/lizard2002.djvu and doc/lizardtech2007.djvu):

//C-

//C-  ------------------------------------------------------------------

//C- | DjVu (r) Reference Library (v. 3.5)

//C- | Copyright (c) 1999-2001 LizardTech, Inc. All Rights Reserved.

//C- | The DjVu Reference Library is protected by U.S. Pat. No.

//C- | 6,058,214 and patents pending.

//C- |

//C- | This software is subject to, and may be distributed under, the

//C- | GNU General Public License, either Version 2 of the license,

//C- | or (at your option) any later version. The license should have

//C- | accompanied the software or you may obtain a copy of the license

//C- | from the Free Software Foundation at http://www.fsf.org .

//C- |

//C- | The computer code originally released by LizardTech under this

//C- | license and unmodified by other parties is deemed "the LIZARDTECH

//C- | ORIGINAL CODE."  Subject to any third party intellectual property

//C- | claims, LizardTech grants recipient a worldwide, royalty-free, 

//C- | non-exclusive license to make, use, sell, or otherwise dispose of 

//C- | the LIZARDTECH ORIGINAL CODE or of programs derived from the 

//C- | LIZARDTECH ORIGINAL CODE in compliance with the terms of the GNU 

//C- | General Public License.   This grant only confers the right to 

//C- | infringe patent claims underlying the LIZARDTECH ORIGINAL CODE to 

//C- | the extent such infringement is reasonably necessary to enable 

//C- | recipient to make, have made, practice, sell, or otherwise dispose 

//C- | of the LIZARDTECH ORIGINAL CODE (or portions thereof) and not to 

//C- | any greater extent that may be necessary to utilize further 

//C- | modifications or combinations.

//C- |

//C- | The LIZARDTECH ORIGINAL CODE is provided "AS IS" WITHOUT WARRANTY

//C- | OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED

//C- | TO ANY WARRANTY OF NON-INFRINGEMENT, OR ANY IMPLIED WARRANTY OF

//C- | MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

//C- +------------------------------------------------------------------

#ifdef HAVE_CONFIG_H

# include "config.h"

#endif

#if NEED_GNUG_PRAGMAS

# pragma implementation

#endif

#include "DjVuInfo.h"

#include "GException.h"

#include "ByteStream.h"

#include "GString.h"

#ifdef HAVE_NAMESPACES

namespace DJVU {

# ifdef NOT_DEFINED // Just to fool emacs c++ mode

}

#endif

#endif

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

// CLASS DJVUINFO

#define STRINGIFY(x) STRINGIFY_(x)

#define STRINGIFY_(x) #x

DjVuInfo::DjVuInfo()

  : width(0), height(0), 

#ifdef DJVUVERSION_FOR_OUTPUT

    version(DJVUVERSION_FOR_OUTPUT),

#else

    version(DJVUVERSION),

#endif

    dpi(300), gamma(2.2), orientation(0)

{

}

void 

DjVuInfo::decode(ByteStream &bs)

{

  // Set to default values

  width = 0;

  height = 0;

  version = DJVUVERSION;

  dpi = 300;

  gamma = 2.2;

  orientation=0;

  // Read data

  unsigned char buffer[10];

  int  size = bs.readall((void*)buffer, sizeof(buffer));

  if (size == 0)

    G_THROW( ByteStream::EndOfFile );

  if (size < 5)

    G_THROW( ERR_MSG("DjVuInfo.corrupt_file") );

  // Analyze data with backward compatibility in mind!

  if (size>=2)

    width = (buffer[0]<<8) + buffer[1];

  if (size>=4)

    height = (buffer[2]<<8) + buffer[3];

  if (size>=5)

    version = buffer[4];

  if (size>=6 && buffer[5]!=0xff)

    version = (buffer[5]<<8) + buffer[4];

  if (size>=8 && buffer[7]!=0xff)

    dpi = (buffer[7]<<8) + buffer[6];

  if (size>=9)

    gamma = 0.1 * buffer[8];

  int flags=0;

  if (size>=10)

    flags = buffer[9];

  // Fixup

  if (gamma<0.3)

    gamma=0.3;

  if (gamma>5.0)

    gamma=5.0;

  if (dpi < 25 || dpi > 6000)

    dpi = 300;

  switch (flags & 0x7)

    {

    case 6:  orientation=1; break; 

    case 2:  orientation=2; break; 

    case 5:  orientation=3; break;

    default: orientation=0; break;

    }

}

void 

DjVuInfo::encode(ByteStream &bs)

{

  bs.write16(width);

  bs.write16(height);

  bs.write8(version & 0xff);

  bs.write8(version >> 8);

  bs.write8(dpi & 0xff);

  bs.write8(dpi >> 8);

  bs.write8((int)(10.0*gamma+0.5) );

  unsigned char flags;

  switch (orientation) 

    {

    default: flags=1; break;

    case 1:  flags=6; break;

    case 2:  flags=2; break;

    case 3:  flags=5; break;

    }

  bs.write8(flags);

}

unsigned int 

DjVuInfo::get_memory_usage() const

{

  return sizeof(DjVuInfo);

}

GUTF8String

DjVuInfo::get_paramtags(void) const

{

  GUTF8String retval;

  if(orientation)

    retval+="

      +GUTF8String(((4-orientation)%4)*90)+"\" />\n";

  if(dpi)

    retval+="

      +GUTF8String(dpi)+"\" />\n";

  if(gamma)

    retval+="

      +GUTF8String(gamma)+"\" />\n";

  return retval;

}

void

DjVuInfo::writeParam(ByteStream &str_out) const

{

  str_out.writestring(get_paramtags());

}

#ifdef HAVE_NAMESPACES

}

# ifndef NOT_USING_DJVU_NAMESPACE

using namespace DJVU;

# endif

#endif