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206 lines
5.9 KiB
206 lines
5.9 KiB
//C- -*- C++ -*-
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//C- -------------------------------------------------------------------
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//C- DjVuLibre-3.5
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//C- Copyright (c) 2002 Leon Bottou and Yann Le Cun.
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//C- Copyright (c) 2001 AT&T
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//C-
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//C- This software is subject to, and may be distributed under, the
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//C- GNU General Public License, Version 2. The license should have
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//C- accompanied the software or you may obtain a copy of the license
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//C- from the Free Software Foundation at http://www.fsf.org .
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//C-
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//C- This program is distributed in the hope that it will be useful,
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//C- but WITHOUT ANY WARRANTY; without even the implied warranty of
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//C- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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//C- GNU General Public License for more details.
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//C-
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//C- DjVuLibre-3.5 is derived from the DjVu(r) Reference Library
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//C- distributed by Lizardtech Software. On July 19th 2002, Lizardtech
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//C- Software authorized us to replace the original DjVu(r) Reference
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//C- Library notice by the following text (see doc/lizard2002.djvu):
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//C-
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//C- ------------------------------------------------------------------
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//C- | DjVu (r) Reference Library (v. 3.5)
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//C- | Copyright (c) 1999-2001 LizardTech, Inc. All Rights Reserved.
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//C- | The DjVu Reference Library is protected by U.S. Pat. No.
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//C- | 6,058,214 and patents pending.
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//C- |
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//C- | This software is subject to, and may be distributed under, the
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//C- | GNU General Public License, Version 2. The license should have
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//C- | accompanied the software or you may obtain a copy of the license
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//C- | from the Free Software Foundation at http://www.fsf.org .
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//C- |
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//C- | The computer code originally released by LizardTech under this
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//C- | license and unmodified by other parties is deemed "the LIZARDTECH
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//C- | ORIGINAL CODE." Subject to any third party intellectual property
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//C- | claims, LizardTech grants recipient a worldwide, royalty-free,
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//C- | non-exclusive license to make, use, sell, or otherwise dispose of
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//C- | the LIZARDTECH ORIGINAL CODE or of programs derived from the
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//C- | LIZARDTECH ORIGINAL CODE in compliance with the terms of the GNU
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//C- | General Public License. This grant only confers the right to
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//C- | infringe patent claims underlying the LIZARDTECH ORIGINAL CODE to
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//C- | the extent such infringement is reasonably necessary to enable
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//C- | recipient to make, have made, practice, sell, or otherwise dispose
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//C- | of the LIZARDTECH ORIGINAL CODE (or portions thereof) and not to
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//C- | any greater extent that may be necessary to utilize further
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//C- | modifications or combinations.
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//C- |
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//C- | The LIZARDTECH ORIGINAL CODE is provided "AS IS" WITHOUT WARRANTY
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//C- | OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
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//C- | TO ANY WARRANTY OF NON-INFRINGEMENT, OR ANY IMPLIED WARRANTY OF
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//C- | MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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//C- +------------------------------------------------------------------
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//
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// $Id: DjVuInfo.cpp,v 1.9 2003/11/07 22:08:21 leonb Exp $
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// $Name: release_3_5_15 $
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#if NEED_GNUG_PRAGMAS
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# pragma implementation
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#endif
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#include "DjVuInfo.h"
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#include "GException.h"
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#include "ByteStream.h"
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#include "GString.h"
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#ifdef HAVE_NAMESPACES
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namespace DJVU {
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# ifdef NOT_DEFINED // Just to fool emacs c++ mode
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}
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#endif
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#endif
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// ----------------------------------------
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// CLASS DJVUINFO
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#define STRINGIFY(x) STRINGIFY_(x)
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#define STRINGIFY_(x) #x
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DjVuInfo::DjVuInfo()
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: width(0), height(0),
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#ifdef DJVUVERSION_FOR_OUTPUT
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version(DJVUVERSION_FOR_OUTPUT),
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#else
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version(DJVUVERSION),
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#endif
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dpi(300), gamma(2.2), compressable(false), orientation(GRect::BULRNR)
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{
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}
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void
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DjVuInfo::decode(ByteStream &bs)
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{
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// Set to default values
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width = 0;
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height = 0;
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version = DJVUVERSION;
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dpi = 300;
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gamma = 2.2;
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compressable=false;
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orientation=GRect::BULRNR;
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// Read data
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unsigned char buffer[10];
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int size = bs.readall((void*)buffer, sizeof(buffer));
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if (size == 0)
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G_THROW( ByteStream::EndOfFile );
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if (size < 5)
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G_THROW( ERR_MSG("DjVuInfo.corrupt_file") );
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// Analyze data with backward compatibility in mind!
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if (size>=2)
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width = (buffer[0]<<8) + buffer[1];
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if (size>=4)
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height = (buffer[2]<<8) + buffer[3];
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if (size>=5)
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version = buffer[4];
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if (size>=6 && buffer[5]!=0xff)
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version = (buffer[5]<<8) + buffer[4];
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if (size>=8 && buffer[7]!=0xff)
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dpi = (buffer[7]<<8) + buffer[6];
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if (size>=9)
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gamma = 0.1 * buffer[8];
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int flags=0;
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if (size>=10)
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flags = buffer[9];
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// Fixup
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if (gamma<0.3)
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gamma=0.3;
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if (gamma>5.0)
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gamma=5.0;
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if (dpi < 25 || dpi > 6000)
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dpi = 300;
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if(flags&COMPRESSABLE_FLAG)
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compressable=true;
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if(version>=DJVUVERSION_ORIENTATION)
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{
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orientation=(GRect::Orientations)(flags&((int)GRect::BOTTOM_UP|(int)GRect::MIRROR|(int)GRect::ROTATE90_CW));
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}
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}
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void
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DjVuInfo::encode(ByteStream &bs)
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{
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bs.write16(width);
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bs.write16(height);
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bs.write8(version & 0xff);
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bs.write8(version >> 8);
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bs.write8(dpi & 0xff);
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bs.write8(dpi >> 8);
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bs.write8((int)(10.0*gamma+0.5) );
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unsigned char flags=orientation;
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if(compressable)
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{
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flags|=COMPRESSABLE_FLAG;
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}
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bs.write8(flags);
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}
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unsigned int
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DjVuInfo::get_memory_usage() const
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{
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return sizeof(DjVuInfo);
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}
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GUTF8String
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DjVuInfo::get_paramtags(void) const
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{
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const int angle=GRect::findangle(orientation);
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GUTF8String retval;
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if(angle)
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{
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retval+="<PARAM name=\"ROTATE\" value=\""+GUTF8String(angle)+"\" />\n";
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}
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if(orientation == GRect::rotate(angle,GRect::TDLRNR))
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{
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retval+="<PARAM name=\"VFLIP\" value=\"true\" />\n";
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}
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if(dpi)
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{
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retval+="<PARAM name=\"DPI\" value=\""+GUTF8String(dpi)+"\" />\n";
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}
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if(gamma)
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{
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retval+="<PARAM name=\"GAMMA\" value=\""+GUTF8String(gamma)+"\" />\n";
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}
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return retval;
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}
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void
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DjVuInfo::writeParam(ByteStream &str_out) const
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{
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str_out.writestring(get_paramtags());
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}
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#ifdef HAVE_NAMESPACES
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}
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# ifndef NOT_USING_DJVU_NAMESPACE
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using namespace DJVU;
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# endif
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#endif
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