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//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, Version 2. 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
//C- distributed by Lizardtech Software. On July 19th 2002, Lizardtech
//C- Software authorized us to replace the original DjVu(r) Reference
//C- Library notice by the following text (see doc/lizard2002.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, Version 2. 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- +------------------------------------------------------------------
//
// $Id: DjVuInfo.cpp,v 1.9 2003/11/07 22:08:21 leonb Exp $
// $Name: release_3_5_15 $
#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), compressable(false), orientation(GRect::BULRNR)
{
}
void
DjVuInfo::decode(ByteStream &bs)
{
// Set to default values
width = 0;
height = 0;
version = DJVUVERSION;
dpi = 300;
gamma = 2.2;
compressable=false;
orientation=GRect::BULRNR;
// 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;
if(flags&COMPRESSABLE_FLAG)
compressable=true;
if(version>=DJVUVERSION_ORIENTATION)
{
orientation=(GRect::Orientations)(flags&((int)GRect::BOTTOM_UP|(int)GRect::MIRROR|(int)GRect::ROTATE90_CW));
}
}
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=orientation;
if(compressable)
{
flags|=COMPRESSABLE_FLAG;
}
bs.write8(flags);
}
unsigned int
DjVuInfo::get_memory_usage() const
{
return sizeof(DjVuInfo);
}
GUTF8String
DjVuInfo::get_paramtags(void) const
{
const int angle=GRect::findangle(orientation);
GUTF8String retval;
if(angle)
{
retval+="<PARAM name=\"ROTATE\" value=\""+GUTF8String(angle)+"\" />\n";
}
if(orientation == GRect::rotate(angle,GRect::TDLRNR))
{
retval+="<PARAM name=\"VFLIP\" value=\"true\" />\n";
}
if(dpi)
{
retval+="<PARAM name=\"DPI\" value=\""+GUTF8String(dpi)+"\" />\n";
}
if(gamma)
{
retval+="<PARAM name=\"GAMMA\" value=\""+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
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