//========================================================================
//
// HtmlOutputDev.cc
//
// Copyright 1997-2002 Glyph & Cog, LLC
//
// Changed 1999-2000 by G.Ovtcharov
//
// Changed 2002 by Mikhail Kruk
//
//========================================================================

//========================================================================
//
// Modified under the Poppler project - http://poppler.freedesktop.org
//
// All changes made under the Poppler project to this file are licensed
// under GPL version 2 or later
//
// Copyright (C) 2005-2013, 2016-2019 Albert Astals Cid <aacid@kde.org>
// Copyright (C) 2008 Kjartan Maraas <kmaraas@gnome.org>
// Copyright (C) 2008 Boris Toloknov <tlknv@yandex.ru>
// Copyright (C) 2008 Haruyuki Kawabe <Haruyuki.Kawabe@unisys.co.jp>
// Copyright (C) 2008 Tomas Are Haavet <tomasare@gmail.com>
// Copyright (C) 2009 Warren Toomey <wkt@tuhs.org>
// Copyright (C) 2009, 2011 Carlos Garcia Campos <carlosgc@gnome.org>
// Copyright (C) 2009 Reece Dunn <msclrhd@gmail.com>
// Copyright (C) 2010, 2012, 2013 Adrian Johnson <ajohnson@redneon.com>
// Copyright (C) 2010 Hib Eris <hib@hiberis.nl>
// Copyright (C) 2010 OSSD CDAC Mumbai by Leena Chourey (leenac@cdacmumbai.in) and Onkar Potdar (onkar@cdacmumbai.in)
// Copyright (C) 2011 Joshua Richardson <jric@chegg.com>
// Copyright (C) 2011 Stephen Reichling <sreichling@chegg.com>
// Copyright (C) 2011, 2012 Igor Slepchin <igor.slepchin@gmail.com>
// Copyright (C) 2012 Ihar Filipau <thephilips@gmail.com>
// Copyright (C) 2012 Gerald Schmidt <solahcin@gmail.com>
// Copyright (C) 2012 Pino Toscano <pino@kde.org>
// Copyright (C) 2013 Thomas Freitag <Thomas.Freitag@alfa.de>
// Copyright (C) 2013 Julien Nabet <serval2412@yahoo.fr>
// Copyright (C) 2013 Johannes Brandstätter <jbrandstaetter@gmail.com>
// Copyright (C) 2014 Fabio D'Urso <fabiodurso@hotmail.it>
// Copyright (C) 2016 Vincent Le Garrec <legarrec.vincent@gmail.com>
// Copyright (C) 2017 Caolán McNamara <caolanm@redhat.com>
// Copyright (C) 2018 Klarälvdalens Datakonsult AB, a KDAB Group company, <info@kdab.com>. Work sponsored by the LiMux project of the city of Munich
// Copyright (C) 2018 Thibaut Brard <thibaut.brard@gmail.com>
// Copyright (C) 2018, 2019 Adam Reichold <adam.reichold@t-online.de>
// Copyright (C) 2019 Oliver Sander <oliver.sander@tu-dresden.de>
//
// To see a description of the changes please see the Changelog file that
// came with your tarball or type make ChangeLog if you are building from git
//
//========================================================================

#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stddef.h>
#include <ctype.h>
#include <math.h>
#include <iostream>
#include "goo/GooString.h"
#include "goo/gbasename.h"
#include "goo/gbase64.h"
#include "goo/gbasename.h"
#include "UnicodeMap.h"
#include "goo/gmem.h"
#include "Error.h"
#include "GfxState.h"
#include "Page.h"
#include "Annot.h"
#include "PNGWriter.h"
#include "GlobalParams.h"
#include "HtmlOutputDev.h"
#include "HtmlFonts.h"
#include "HtmlUtils.h"
#include "InMemoryFile.h"
#include "Outline.h"
#include "PDFDoc.h"

#ifdef ENABLE_LIBPNG
#include <png.h>
#endif

#define DEBUG __FILE__ << ": " << __LINE__ << ": DEBUG: "

class HtmlImage
{
public:
    HtmlImage(GooString *_fName, GfxState *state)
      : fName(_fName) {
    state->transform(0, 0, &xMin, &yMax);
    state->transform(1, 1, &xMax, &yMin);
  }
 ~HtmlImage() { delete fName; }
  HtmlImage(const HtmlImage &) = delete;
  HtmlImage& operator=(const HtmlImage &) = delete;

  double xMin, xMax;		// image x coordinates
  double yMin, yMax;		// image y coordinates
  GooString  *fName;		// image file name
};

// returns true if x is closer to y than x is to z
static inline bool IS_CLOSER(float x, float y, float z) { return fabs((x)-(y)) < fabs((x)-(z)); }

extern bool complexMode;
extern bool singleHtml;
extern bool dataUrls;
extern bool ignore;
extern bool printCommands;
extern bool printHtml;
extern bool noframes;
extern bool stout;
extern bool xml;
extern bool noRoundedCoordinates;
extern bool showHidden;
extern bool noMerge;

extern double wordBreakThreshold;

static bool debug = false;
static GooString *gstr_buff0 = nullptr; // a workspace in which I format strings

#if 0
static GooString* Dirname(GooString* str){
  
  char *p=str->c_str();
  int len=str->getLength();
  for (int i=len-1;i>=0;i--)
    if (*(p+i)==SLASH) 
      return new GooString(p,i+1);
  return new GooString();
} 
#endif

static const char *print_matrix(const double *mat) {
  delete gstr_buff0;

  gstr_buff0 =  GooString::format("[{0:g} {1:g} {2:g} {3:g} {4:g} {5:g}]",
                                  *mat, mat[1], mat[2], mat[3], mat[4], mat[5]);
  return gstr_buff0->c_str();
}

static const char *print_uni_str(const Unicode *u, const unsigned uLen) {
  GooString *gstr_buff1 = nullptr;

  delete gstr_buff0;

  if (!uLen) return "";
  gstr_buff0 = GooString::format("{0:c}", (*u < 0x7F ? *u & 0xFF : '?'));
  for (unsigned i = 1; i < uLen; i++) {
    if (u[i] < 0x7F) {
      gstr_buff1 = gstr_buff0->append(u[i] < 0x7F ? static_cast<char>(u[i]) & 0xFF : '?');
      delete gstr_buff0;
      gstr_buff0 = gstr_buff1;
    }
  }

  return gstr_buff0->c_str();
}

//------------------------------------------------------------------------
// HtmlString
//------------------------------------------------------------------------

HtmlString::HtmlString(GfxState *state, double fontSize, HtmlFontAccu* _fonts) : fonts(_fonts) {
  GfxFont *font;
  double x, y;

  state->transform(state->getCurX(), state->getCurY(), &x, &y);
  if ((font = state->getFont())) {
    double ascent = font->getAscent();
    double descent = font->getDescent();
    if( ascent > 1.05 ){
        //printf( "ascent=%.15g is too high, descent=%.15g\n", ascent, descent );
        ascent = 1.05;
    }
    if( descent < -0.4 ){
        //printf( "descent %.15g is too low, ascent=%.15g\n", descent, ascent );
        descent = -0.4;
    }
    yMin = y - ascent * fontSize;
    yMax = y - descent * fontSize;
    GfxRGB rgb;
    state->getFillRGB(&rgb);
    HtmlFont hfont=HtmlFont(font, static_cast<int>(fontSize-1), rgb);
    if (isMatRotOrSkew(state->getTextMat())) {
      double normalizedMatrix[4];
      memcpy(normalizedMatrix, state->getTextMat(), sizeof(normalizedMatrix));
      // browser rotates the opposite way
      // so flip the sign of the angle -> sin() components change sign
      if (debug)
        std::cerr << DEBUG << "before transform: " << print_matrix(normalizedMatrix) << std::endl;
      normalizedMatrix[1] *= -1;
      normalizedMatrix[2] *= -1;
      if (debug)
        std::cerr << DEBUG << "after reflecting angle: " << print_matrix(normalizedMatrix) << std::endl;
      normalizeRotMat(normalizedMatrix);
      if (debug)
        std::cerr << DEBUG << "after norm: " << print_matrix(normalizedMatrix) << std::endl;
      hfont.setRotMat(normalizedMatrix);
    }
    fontpos = fonts->AddFont(hfont);
  } else {
    // this means that the PDF file draws text without a current font,
    // which should never happen
    yMin = y - 0.95 * fontSize;
    yMax = y + 0.35 * fontSize;
    fontpos=0;
  }
  if (yMin == yMax) {
    // this is a sanity check for a case that shouldn't happen -- but
    // if it does happen, we want to avoid dividing by zero later
    yMin = y;
    yMax = y + 1;
  }
  col = 0;
  text = nullptr;
  xRight = nullptr;
  link = nullptr;
  len = size = 0;
  yxNext = nullptr;
  xyNext = nullptr;
  htext=new GooString();
  dir = textDirUnknown;
}


HtmlString::~HtmlString() {
  gfree(text);
  delete htext;
  gfree(xRight);
}

void HtmlString::addChar(GfxState *state, double x, double y,
			 double dx, double dy, Unicode u) {
  if (dir == textDirUnknown) {
    //dir = UnicodeMap::getDirection(u);
    dir = textDirLeftRight;
  } 

  if (len == size) {
    size += 16;
    text = (Unicode *)grealloc(text, size * sizeof(Unicode));
    xRight = (double *)grealloc(xRight, size * sizeof(double));
  }
  text[len] = u;
  if (len == 0) {
    xMin = x;
  }
  xMax = xRight[len] = x + dx;
//printf("added char: %f %f xright = %f\n", x, dx, x+dx);
  ++len;
}

void HtmlString::endString()
{
  if( dir == textDirRightLeft && len > 1 )
  {
    //printf("will reverse!\n");
    for (int i = 0; i < len / 2; i++)
    {
      Unicode ch = text[i];
      text[i] = text[len - i - 1];
      text[len - i - 1] = ch;
    }
  }
}

//------------------------------------------------------------------------
// HtmlPage
//------------------------------------------------------------------------

HtmlPage::HtmlPage(bool rawOrder) {
  this->rawOrder = rawOrder;
  curStr = nullptr;
  yxStrings = nullptr;
  xyStrings = nullptr;
  yxCur1 = yxCur2 = nullptr;
  fonts=new HtmlFontAccu();
  links=new HtmlLinks();
  imgList=new std::vector<HtmlImage*>();
  pageWidth=0;
  pageHeight=0;
  fontsPageMarker = 0;
  DocName=nullptr;
  firstPage = -1;
}

HtmlPage::~HtmlPage() {
  clear();
  delete DocName;
  delete fonts;
  delete links;
  for (auto entry : *imgList) {
    delete entry;
  }
  delete imgList;
}

void HtmlPage::updateFont(GfxState *state) {
  GfxFont *font;
  const char *name;
  int code;
  double w;
  
  // adjust the font size
  fontSize = state->getTransformedFontSize();
  if ((font = state->getFont()) && font->getType() == fontType3) {
    // This is a hack which makes it possible to deal with some Type 3
    // fonts.  The problem is that it's impossible to know what the
    // base coordinate system used in the font is without actually
    // rendering the font.  This code tries to guess by looking at the
    // width of the character 'm' (which breaks if the font is a
    // subset that doesn't contain 'm').
    for (code = 0; code < 256; ++code) {
      if ((name = ((Gfx8BitFont *)font)->getCharName(code)) &&
	  name[0] == 'm' && name[1] == '\0') {
	break;
      }
    }
    if (code < 256) {
      w = ((Gfx8BitFont *)font)->getWidth(code);
      if (w != 0) {
	// 600 is a generic average 'm' width -- yes, this is a hack
	fontSize *= w / 0.6;
      }
    }
    const double *fm = font->getFontMatrix();
    if (fm[0] != 0) {
      fontSize *= fabs(fm[3] / fm[0]);
    }
  }
}

void HtmlPage::beginString(GfxState *state, const GooString *s) {
  curStr = new HtmlString(state, fontSize, fonts);
}


void HtmlPage::conv(){
  for(HtmlString *tmp=yxStrings;tmp;tmp=tmp->yxNext){
     delete tmp->htext;
     tmp->htext=HtmlFont::HtmlFilter(tmp->text,tmp->len);

     int linkIndex = 0;
     if (links->inLink(tmp->xMin,tmp->yMin,tmp->xMax,tmp->yMax, linkIndex)){
       tmp->link = links->getLink(linkIndex);
     }
  }
}


void HtmlPage::addChar(GfxState *state, double x, double y,
		       double dx, double dy, 
			double ox, double oy, Unicode *u, int uLen) {
  double x1, y1, w1, h1, dx2, dy2;
  int n, i;
  state->transform(x, y, &x1, &y1);
  n = curStr->len;
 
  // check that new character is in the same direction as current string
  // and is not too far away from it before adding 
  //if ((UnicodeMap::getDirection(u[0]) != curStr->dir) || 
  // XXX
  if (debug) {
    const double *text_mat = state->getTextMat();
    // rotation is (cos q, sin q, -sin q, cos q, 0, 0)
    // sin q is zero iff there is no rotation, or 180 deg. rotation;
    // for 180 rotation, cos q will be negative
    if (text_mat[0] < 0 || !is_within(text_mat[1], .1, 0)) {
      std::cerr << DEBUG << "rotation matrix for \"" << print_uni_str(u, uLen) << '"' << std::endl;
      std::cerr << "text " << print_matrix(state->getTextMat());
    }
  }
  if (n > 0 && // don't start a new string, unless there is already a string
      // TODO: the following line assumes that text is flowing left to
      // right, which will not necessarily be the case, e.g. if rotated;
      // It assesses whether or not two characters are close enough to
      // be part of the same string
      fabs(x1 - curStr->xRight[n-1]) > wordBreakThreshold * (curStr->yMax - curStr->yMin) &&
      // rotation is (cos q, sin q, -sin q, cos q, 0, 0)
      // sin q is zero iff there is no rotation, or 180 deg. rotation;
      // for 180 rotation, cos q will be negative
      !rot_matrices_equal(curStr->getFont().getRotMat(), state->getTextMat()))
  {
    endString();
    beginString(state, nullptr);
  }
  state->textTransformDelta(state->getCharSpace() * state->getHorizScaling(),
			    0, &dx2, &dy2);
  dx -= dx2;
  dy -= dy2;
  state->transformDelta(dx, dy, &w1, &h1);
  if (uLen != 0) {
    w1 /= uLen;
    h1 /= uLen;
  }
  for (i = 0; i < uLen; ++i) {
    curStr->addChar(state, x1 + i*w1, y1 + i*h1, w1, h1, u[i]);
  }
}

void HtmlPage::endString() {
  HtmlString *p1, *p2;
  double h, y1, y2;

  // throw away zero-length strings -- they don't have valid xMin/xMax
  // values, and they're useless anyway
  if (curStr->len == 0) {
    delete curStr;
    curStr = nullptr;
    return;
  }

  curStr->endString();

#if 0 //~tmp
  if (curStr->yMax - curStr->yMin > 20) {
    delete curStr;
    curStr = NULL;
    return;
  }
#endif

  // insert string in y-major list
  h = curStr->yMax - curStr->yMin;
  y1 = curStr->yMin + 0.5 * h;
  y2 = curStr->yMin + 0.8 * h;
  if (rawOrder) {
    p1 = yxCur1;
    p2 = nullptr;
  } else if ((!yxCur1 ||
              (y1 >= yxCur1->yMin &&
               (y2 >= yxCur1->yMax || curStr->xMax >= yxCur1->xMin))) &&
             (!yxCur2 ||
              (y1 < yxCur2->yMin ||
               (y2 < yxCur2->yMax && curStr->xMax < yxCur2->xMin)))) {
    p1 = yxCur1;
    p2 = yxCur2;
  } else {
    for (p1 = nullptr, p2 = yxStrings; p2; p1 = p2, p2 = p2->yxNext) {
      if (y1 < p2->yMin || (y2 < p2->yMax && curStr->xMax < p2->xMin))
        break;
    }
    yxCur2 = p2;
  }
  yxCur1 = curStr;
  if (p1)
    p1->yxNext = curStr;
  else
    yxStrings = curStr;
  curStr->yxNext = p2;
  curStr = nullptr;
}

static const char *strrstr( const char *s, const char *ss )
{
  const char *p = strstr( s, ss );
  for( const char *pp = p; pp != nullptr; pp = strstr( p+1, ss ) ){
    p = pp;
  }
  return p;
}

static void CloseTags( GooString *htext, bool &finish_a, bool &finish_italic, bool &finish_bold )
{
  const char *last_italic = finish_italic && ( finish_bold   || finish_a    ) ? strrstr( htext->c_str(), "<i>" ) : nullptr;
  const char *last_bold   = finish_bold   && ( finish_italic || finish_a    ) ? strrstr( htext->c_str(), "<b>" ) : nullptr;
  const char *last_a      = finish_a      && ( finish_italic || finish_bold ) ? strrstr( htext->c_str(), "<a " ) : nullptr;
  if( finish_a && ( finish_italic || finish_bold ) && last_a > ( last_italic > last_bold ? last_italic : last_bold ) ){
    htext->append("</a>", 4);
    finish_a = false;
  }
  if( finish_italic && finish_bold && last_italic > last_bold ){
    htext->append("</i>", 4);
    finish_italic = false;
  }
  if( finish_bold )
    htext->append("</b>", 4);
  if( finish_italic )
    htext->append("</i>", 4);
  if( finish_a )
    htext->append("</a>");
}

// Strings are lines of text;
// This function aims to combine strings into lines and paragraphs if !noMerge
// It may also strip out duplicate strings (if they are on top of each other); sometimes they are to create a font effect
void HtmlPage::coalesce() {
  HtmlString *str1, *str2;
  HtmlFont *hfont1, *hfont2;
  double space, horSpace, vertSpace, vertOverlap;
  bool addSpace, addLineBreak;
  int n, i;
  double curX, curY;

#if 0 //~ for debugging
  for (str1 = yxStrings; str1; str1 = str1->yxNext) {
    printf("x=%f..%f  y=%f..%f  size=%2d '",
	   str1->xMin, str1->xMax, str1->yMin, str1->yMax,
	   (int)(str1->yMax - str1->yMin));
    for (i = 0; i < str1->len; ++i) {
      fputc(str1->text[i] & 0xff, stdout);
    }
    printf("'\n");
  }
  printf("\n------------------------------------------------------------\n\n");
#endif
  str1 = yxStrings;

  if( !str1 ) return;

  //----- discard duplicated text (fake boldface, drop shadows)
  if( !complexMode )
  {	/* if not in complex mode get rid of duplicate strings */
	HtmlString *str3;
	bool found;
  	while (str1)
	{
		double size = str1->yMax - str1->yMin;
		double xLimit = str1->xMin + size * 0.2;
		found = false;
		for (str2 = str1, str3 = str1->yxNext;
			str3 && str3->xMin < xLimit;
			str2 = str3, str3 = str2->yxNext)
		{
			if (str3->len == str1->len &&
				!memcmp(str3->text, str1->text, str1->len * sizeof(Unicode)) &&
				fabs(str3->yMin - str1->yMin) < size * 0.2 &&
				fabs(str3->yMax - str1->yMax) < size * 0.2 &&
				fabs(str3->xMax - str1->xMax) < size * 0.2)
			{
				found = true;
				//printf("found duplicate!\n");
				break;
			}
		}
		if (found)
		{
			str2->xyNext = str3->xyNext;
			str2->yxNext = str3->yxNext;
			delete str3;
		}
		else
		{
			str1 = str1->yxNext;
		}
	}		
  }	/*- !complexMode */
  
  str1 = yxStrings;
  
  hfont1 = getFont(str1);
  if( hfont1->isBold() )
    str1->htext->insert(0,"<b>",3);
  if( hfont1->isItalic() )
    str1->htext->insert(0,"<i>",3);
  if( str1->getLink() != nullptr ) {
    GooString *ls = str1->getLink()->getLinkStart();
    str1->htext->insert(0, ls);
    delete ls;
  }
  curX = str1->xMin; curY = str1->yMin;

  while (str1 && (str2 = str1->yxNext)) {
    hfont2 = getFont(str2);
    space = str1->yMax - str1->yMin; // the height of the font's bounding box
    horSpace = str2->xMin - str1->xMax;
    // if strings line up on left-hand side AND they are on subsequent lines, we need a line break
    addLineBreak = !noMerge && (fabs(str1->xMin - str2->xMin) < 0.4) && IS_CLOSER(str2->yMax, str1->yMax + space, str1->yMax);
    vertSpace = str2->yMin - str1->yMax;

//printf("coalesce %d %d %f? ", str1->dir, str2->dir, d);

    if (str2->yMin >= str1->yMin && str2->yMin <= str1->yMax)
    {
	vertOverlap = str1->yMax - str2->yMin;
    } else
    if (str2->yMax >= str1->yMin && str2->yMax <= str1->yMax)
    {
	vertOverlap = str2->yMax - str1->yMin;
    } else
    {
    	vertOverlap = 0;
    } 
    
    // Combine strings if:
    //  They appear to be the same font (complex mode only) && going in the same direction AND at least one of the following:
    //  1.  They appear to be part of the same line of text
    //  2.  They appear to be subsequent lines of a paragraph
    //  We assume (1) or (2) above, respectively, based on:
    //  (1)  strings overlap vertically AND
    //       horizontal space between end of str1 and start of str2 is consistent with a single space or less;
    //       when rawOrder, the strings have to overlap vertically by at least 50%
    //  (2)  Strings flow down the page, but the space between them is not too great, and they are lined up on the left
    if (
	(
	 (
	  (
	   (rawOrder && vertOverlap > 0.5 * space) 
	   ||
	   (!rawOrder && str2->yMin < str1->yMax)
	  ) &&
	  (horSpace > -0.5 * space && horSpace < space)
	 ) ||
       	 (vertSpace >= 0 && vertSpace < 0.5 * space && addLineBreak)
	) &&
	(!complexMode || (hfont1->isEqualIgnoreBold(*hfont2))) && // in complex mode fonts must be the same, in other modes fonts do not metter
	str1->dir == str2->dir // text direction the same
       ) 
    {
//      printf("yes\n");
      n = str1->len + str2->len;
      if ((addSpace = horSpace > wordBreakThreshold * space)) {
        ++n;
      }
      if (addLineBreak) {
        ++n;
      }
  
      str1->size = (n + 15) & ~15;
      str1->text = (Unicode *)grealloc(str1->text,
				       str1->size * sizeof(Unicode));
      str1->xRight = (double *)grealloc(str1->xRight,
					str1->size * sizeof(double));
      if (addSpace) {
		  str1->text[str1->len] = 0x20;
		  str1->htext->append(xml?" ":"&#160;");
		  str1->xRight[str1->len] = str2->xMin;
		  ++str1->len;
      }
      if (addLineBreak) {
	  str1->text[str1->len] = '\n';
	  str1->htext->append("<br/>");
	  str1->xRight[str1->len] = str2->xMin;
	  ++str1->len;
	  str1->yMin = str2->yMin;
	  str1->yMax = str2->yMax;
	  str1->xMax = str2->xMax;
	  int fontLineSize = hfont1->getLineSize();
	  int curLineSize = (int)(vertSpace + space); 
	  if( curLineSize != fontLineSize )
	  {
	      HtmlFont *newfnt = new HtmlFont(*hfont1);
	      newfnt->setLineSize(curLineSize);
	      str1->fontpos = fonts->AddFont(*newfnt);
	      delete newfnt;
	      hfont1 = getFont(str1);
	      // we have to reget hfont2 because it's location could have
	      // changed on resize
	      hfont2 = getFont(str2); 
	  }
      }
      for (i = 0; i < str2->len; ++i) {
	str1->text[str1->len] = str2->text[i];
	str1->xRight[str1->len] = str2->xRight[i];
	++str1->len;
      }

      /* fix <i>, <b> if str1 and str2 differ and handle switch of links */
      HtmlLink *hlink1 = str1->getLink();
      HtmlLink *hlink2 = str2->getLink();
      bool switch_links = !hlink1 || !hlink2 || !hlink1->isEqualDest(*hlink2);
      bool finish_a = switch_links && hlink1 != nullptr;
      bool finish_italic = hfont1->isItalic() && ( !hfont2->isItalic() || finish_a );
      bool finish_bold   = hfont1->isBold()   && ( !hfont2->isBold()   || finish_a || finish_italic );
      CloseTags( str1->htext, finish_a, finish_italic, finish_bold );
      if( switch_links && hlink2 != nullptr ) {
        GooString *ls = hlink2->getLinkStart();
        str1->htext->append(ls);
        delete ls;
      }
      if( ( !hfont1->isItalic() || finish_italic ) && hfont2->isItalic() )
	    str1->htext->append("<i>", 3);
      if( ( !hfont1->isBold() || finish_bold ) && hfont2->isBold() )
	    str1->htext->append("<b>", 3);


      str1->htext->append(str2->htext);
      // str1 now contains href for link of str2 (if it is defined)
      str1->link = str2->link; 
      hfont1 = hfont2;
      if (str2->xMax > str1->xMax) {
	str1->xMax = str2->xMax;
      }
      if (str2->yMax > str1->yMax) {
	str1->yMax = str2->yMax;
      }
      str1->yxNext = str2->yxNext;
      delete str2;
    } else { // keep strings separate
//      printf("no\n"); 
      bool finish_a = str1->getLink() != nullptr;
      bool finish_bold   = hfont1->isBold();
      bool finish_italic = hfont1->isItalic();
      CloseTags( str1->htext, finish_a, finish_italic, finish_bold );
     
      str1->xMin = curX; str1->yMin = curY; 
      str1 = str2;
      curX = str1->xMin; curY = str1->yMin;
      hfont1 = hfont2;
      if( hfont1->isBold() )
	str1->htext->insert(0,"<b>",3);
      if( hfont1->isItalic() )
	str1->htext->insert(0,"<i>",3);
      if( str1->getLink() != nullptr ) {
	GooString *ls = str1->getLink()->getLinkStart();
	str1->htext->insert(0, ls);
	delete ls;
      }
    }
  }
  str1->xMin = curX; str1->yMin = curY;

  bool finish_bold   = hfont1->isBold();
  bool finish_italic = hfont1->isItalic();
  bool finish_a = str1->getLink() != nullptr;
  CloseTags( str1->htext, finish_a, finish_italic, finish_bold );

#if 0 //~ for debugging
  for (str1 = yxStrings; str1; str1 = str1->yxNext) {
    printf("x=%3d..%3d  y=%3d..%3d  size=%2d ",
	   (int)str1->xMin, (int)str1->xMax, (int)str1->yMin, (int)str1->yMax,
	   (int)(str1->yMax - str1->yMin));
    printf("'%s'\n", str1->htext->c_str());  
  }
  printf("\n------------------------------------------------------------\n\n");
#endif

}

void HtmlPage::dumpAsXML(FILE* f,int page){  
  fprintf(f, "<page number=\"%d\" position=\"absolute\"", page);
  fprintf(f," top=\"0\" left=\"0\" height=\"%d\" width=\"%d\">\n", pageHeight,pageWidth);
    
  for(int i=fontsPageMarker;i < fonts->size();i++) {
    GooString *fontCSStyle = fonts->CSStyle(i);
    fprintf(f,"\t%s\n",fontCSStyle->c_str());
    delete fontCSStyle;
  }

  for (auto ptr : *imgList) {
    auto img = static_cast<HtmlImage *>(ptr);
    if (!noRoundedCoordinates) {
      fprintf(f, "<image top=\"%d\" left=\"%d\" ", xoutRound(img->yMin), xoutRound(img->xMin));
      fprintf(f, "width=\"%d\" height=\"%d\" ", xoutRound(img->xMax - img->xMin), xoutRound(img->yMax - img->yMin));
    }
    else {
      fprintf(f, "<image top=\"%f\" left=\"%f\" ", img->yMin, img->xMin);
      fprintf(f, "width=\"%f\" height=\"%f\" ", img->xMax - img->xMin, img->yMax - img->yMin);
    }
    fprintf(f,"src=\"%s\"/>\n",img->fName->c_str());
    delete img;
  }
  imgList->clear();

  for(HtmlString *tmp=yxStrings;tmp;tmp=tmp->yxNext){
    if (tmp->htext){
      if (!noRoundedCoordinates) {
        fprintf(f, "<text top=\"%d\" left=\"%d\" ", xoutRound(tmp->yMin), xoutRound(tmp->xMin));
        fprintf(f, "width=\"%d\" height=\"%d\" ", xoutRound(tmp->xMax - tmp->xMin), xoutRound(tmp->yMax - tmp->yMin));
      }
      else {
        fprintf(f, "<text top=\"%f\" left=\"%f\" ", tmp->yMin, tmp->xMin);
        fprintf(f, "width=\"%f\" height=\"%f\" ", tmp->xMax - tmp->xMin, tmp->yMax - tmp->yMin);
      }
      fprintf(f,"font=\"%d\">", tmp->fontpos);
      fputs(tmp->htext->c_str(),f);
      fputs("</text>\n",f);
    }
  }
  fputs("</page>\n",f);
}

static void printCSS(FILE *f)
{
  // Image flip/flop CSS
  // Source:
  // http://stackoverflow.com/questions/1309055/cross-browser-way-to-flip-html-image-via-javascript-css
  // tested in Chrome, Fx (Linux) and IE9 (W7)
  static const char css[] = 
    "<style type=\"text/css\">" "\n"
    "<!--" "\n"
    ".xflip {" "\n"
    "    -moz-transform: scaleX(-1);" "\n"
    "    -webkit-transform: scaleX(-1);" "\n"
    "    -o-transform: scaleX(-1);" "\n"
    "    transform: scaleX(-1);" "\n"
    "    filter: fliph;" "\n"
    "}" "\n"
    ".yflip {" "\n"
    "    -moz-transform: scaleY(-1);" "\n"
    "    -webkit-transform: scaleY(-1);" "\n"
    "    -o-transform: scaleY(-1);" "\n"
    "    transform: scaleY(-1);" "\n"
    "    filter: flipv;" "\n"
    "}" "\n"
    ".xyflip {" "\n"
    "    -moz-transform: scaleX(-1) scaleY(-1);" "\n"
    "    -webkit-transform: scaleX(-1) scaleY(-1);" "\n"
    "    -o-transform: scaleX(-1) scaleY(-1);" "\n"
    "    transform: scaleX(-1) scaleY(-1);" "\n"
    "    filter: fliph + flipv;" "\n"
    "}" "\n"
    "-->" "\n"
    "</style>" "\n";

  fwrite( css, sizeof(css)-1, 1, f );
}

int HtmlPage::dumpComplexHeaders(FILE * const file, FILE *& pageFile, int page) {
  GooString* tmp;

  if( !noframes )
  {
      GooString* pgNum=GooString::fromInt(page);
      tmp = new GooString(DocName);
      if (!singleHtml){
            tmp->append('-')->append(pgNum)->append(".html");
            pageFile = fopen(tmp->c_str(), "w");
      } else {
            tmp->append("-html")->append(".html");
            pageFile = fopen(tmp->c_str(), "a");
      }
      delete pgNum;
      if (!pageFile) {
	  error(errIO, -1, "Couldn't open html file '{0:t}'", tmp);
	  delete tmp;
	  return 1;
      } 

      if (!singleHtml)
        fprintf(pageFile,"%s\n<html xmlns=\"http://www.w3.org/1999/xhtml\" lang=\"\" xml:lang=\"\">\n<head>\n<title>Page %d</title>\n\n", DOCTYPE, page);
      else
        fprintf(pageFile,"%s\n<html xmlns=\"http://www.w3.org/1999/xhtml\" lang=\"\" xml:lang=\"\">\n<head>\n<title>%s</title>\n\n", DOCTYPE, tmp->c_str());

      delete tmp;

      GooString *htmlEncoding = HtmlOutputDev::mapEncodingToHtml(globalParams->getTextEncodingName());
      if (!singleHtml)
        fprintf(pageFile, "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=%s\"/>\n", htmlEncoding->c_str());
      else
        fprintf(pageFile, "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=%s\"/>\n <br/>\n", htmlEncoding->c_str());
      delete htmlEncoding;
  }
  else 
  {
      pageFile = file;
      fprintf(pageFile,"<!-- Page %d -->\n", page);
      fprintf(pageFile,"<a name=\"%d\"></a>\n", page);
  } 
  
  return 0;
}

void HtmlPage::dumpComplex(FILE *file, int page, const std::vector<std::string>& backgroundImages) {
  FILE* pageFile;

  if( firstPage == -1 ) firstPage = page; 
  
  if (dumpComplexHeaders(file, pageFile, page)) { error(errIO, -1, "Couldn't write headers."); return; }
   
  fputs("<style type=\"text/css\">\n<!--\n",pageFile);
  fputs("\tp {margin: 0; padding: 0;}",pageFile);
  for(int i=fontsPageMarker;i!=fonts->size();i++) {
    GooString *fontCSStyle;
    if (!singleHtml)
         fontCSStyle = fonts->CSStyle(i);
    else
         fontCSStyle = fonts->CSStyle(i,page);
    fprintf(pageFile,"\t%s\n",fontCSStyle->c_str());
    delete fontCSStyle;
  }
 
  fputs("-->\n</style>\n",pageFile);
  
  if( !noframes )
  {  
      fputs("</head>\n<body bgcolor=\"#A0A0A0\" vlink=\"blue\" link=\"blue\">\n",pageFile); 
  }
  
  fprintf(pageFile,"<div id=\"page%d-div\" style=\"position:relative;width:%dpx;height:%dpx;\">\n",
      page, pageWidth, pageHeight);

  if(!ignore && (size_t) (page - firstPage) < backgroundImages.size())
  {
    fprintf(pageFile,
      "<img width=\"%d\" height=\"%d\" src=\"%s\" alt=\"background image\"/>\n",
      pageWidth, pageHeight, backgroundImages[page - firstPage].c_str());
  }
  
  for(HtmlString *tmp1=yxStrings;tmp1;tmp1=tmp1->yxNext){
    if (tmp1->htext){
      fprintf(pageFile,
	      "<p style=\"position:absolute;top:%dpx;left:%dpx;white-space:nowrap\" class=\"ft",
	      xoutRound(tmp1->yMin),
	      xoutRound(tmp1->xMin));
      if (!singleHtml) {
          fputc('0', pageFile);
      } else {
          fprintf(pageFile, "%d", page);
      }
      fprintf(pageFile,"%d\">", tmp1->fontpos);
      fputs(tmp1->htext->c_str(), pageFile);
      fputs("</p>\n", pageFile);
    }
  }

  fputs("</div>\n", pageFile);
  
  if( !noframes )
  {
      fputs("</body>\n</html>\n",pageFile);
      fclose(pageFile);
  }
}


void HtmlPage::dump(FILE *f, int pageNum, const std::vector<std::string>& backgroundImages)
{
  if (complexMode || singleHtml)
  {
    if (xml) dumpAsXML(f, pageNum);
    if (!xml) dumpComplex(f, pageNum, backgroundImages);
  }
  else
  {
    fprintf(f,"<a name=%d></a>",pageNum);
    // Loop over the list of image names on this page
    for (auto ptr : *imgList) {
      auto img = static_cast<HtmlImage *>(ptr);

      // see printCSS() for class names
      const char *styles[4] = { "", " class=\"xflip\"", " class=\"yflip\"", " class=\"xyflip\"" };
      int style_index=0;
      if (img->xMin > img->xMax) style_index += 1; // xFlip
      if (img->yMin > img->yMax) style_index += 2; // yFlip

      fprintf(f,"<img%s src=\"%s\"/><br/>\n",styles[style_index],img->fName->c_str());
      delete img;
    }
    imgList->clear();

    GooString* str;
    for(HtmlString *tmp=yxStrings;tmp;tmp=tmp->yxNext){
      if (tmp->htext){
		str=new GooString(tmp->htext); 
		fputs(str->c_str(),f);
		delete str;      
		fputs("<br/>\n",f);
      }
    }
	fputs("<hr/>\n",f);  
  }
}


void HtmlPage::clear() {
  HtmlString *p1, *p2;

  if (curStr) {
    delete curStr;
    curStr = nullptr;
  }
  for (p1 = yxStrings; p1; p1 = p2) {
    p2 = p1->yxNext;
    delete p1;
  }
  yxStrings = nullptr;
  xyStrings = nullptr;
  yxCur1 = yxCur2 = nullptr;

  if( !noframes )
  {
      delete fonts;
      fonts=new HtmlFontAccu();
      fontsPageMarker = 0;
  }
  else
  {
      fontsPageMarker = fonts->size();
  }

  delete links;
  links=new HtmlLinks();
 

}

void HtmlPage::setDocName(const char *fname){
  DocName=new GooString(fname);
}

void HtmlPage::addImage(GooString *fname, GfxState *state) {
  HtmlImage *img = new HtmlImage(fname, state);
  imgList->push_back(img);
}

//------------------------------------------------------------------------
// HtmlMetaVar
//------------------------------------------------------------------------

HtmlMetaVar::HtmlMetaVar(const char *_name, const char *_content)
{
    name = new GooString(_name);
    content = new GooString(_content);
}

HtmlMetaVar::~HtmlMetaVar()
{
   delete name;
   delete content;
} 
    
GooString* HtmlMetaVar::toString()	
{
    GooString *result = new GooString("<meta name=\"");
    result->append(name);
    result->append("\" content=\"");
    result->append(content);
    result->append("\"/>");
    return result;
}

//------------------------------------------------------------------------
// HtmlOutputDev
//------------------------------------------------------------------------

static const char* HtmlEncodings[][2] = {
    {"Latin1", "ISO-8859-1"},
    {nullptr, nullptr}
};

GooString* HtmlOutputDev::mapEncodingToHtml(GooString* encoding)
{
  GooString* enc = encoding;
  for(int i = 0; HtmlEncodings[i][0] != nullptr; i++)
  {
    if( enc->cmp(HtmlEncodings[i][0]) == 0 )
    {
      delete enc;
      return new GooString(HtmlEncodings[i][1]);
    }
  }
  return enc; 
}

void HtmlOutputDev::doFrame(int firstPage){
  GooString* fName=new GooString(Docname);
  GooString* htmlEncoding;
  fName->append(".html");

  if (!(fContentsFrame = fopen(fName->c_str(), "w"))){
    error(errIO, -1, "Couldn't open html file '{0:t}'", fName);
    delete fName;
    return;
  }
  
  delete fName;
    
  const std::string baseName = gbasename(Docname->c_str());
  fputs(DOCTYPE, fContentsFrame);
  fputs("\n<html>",fContentsFrame);
  fputs("\n<head>",fContentsFrame);
  fprintf(fContentsFrame,"\n<title>%s</title>",docTitle->c_str());
  htmlEncoding = mapEncodingToHtml(globalParams->getTextEncodingName());
  fprintf(fContentsFrame, "\n<meta http-equiv=\"Content-Type\" content=\"text/html; charset=%s\"/>\n", htmlEncoding->c_str());
  dumpMetaVars(fContentsFrame);
  fprintf(fContentsFrame, "</head>\n");
  fputs("<frameset cols=\"100,*\">\n",fContentsFrame);
  fprintf(fContentsFrame,"<frame name=\"links\" src=\"%s_ind.html\"/>\n", baseName.c_str());
  fputs("<frame name=\"contents\" src=",fContentsFrame); 
  if (complexMode) 
      fprintf(fContentsFrame,"\"%s-%d.html\"", baseName.c_str(), firstPage);
  else
      fprintf(fContentsFrame,"\"%ss.html\"", baseName.c_str());
  
  fputs("/>\n</frameset>\n</html>\n",fContentsFrame);
 
  delete htmlEncoding;
  fclose(fContentsFrame);  
}

HtmlOutputDev::HtmlOutputDev(Catalog *catalogA, const char *fileName, const char *title,
	const char *author, const char *keywords, const char *subject, const char *date,
	bool rawOrder, int firstPage, bool outline) 
{
  catalog = catalogA;
  fContentsFrame = nullptr;
  page = nullptr;
  docTitle = new GooString(title);
  pages = nullptr;
  dumpJPEG=true;
  //write = true;
  this->rawOrder = rawOrder;
  this->doOutline = outline;
  ok = false;
  //this->firstPage = firstPage;
  //pageNum=firstPage;
  // open file
  needClose = false;
  pages = new HtmlPage(rawOrder);
  
  glMetaVars = new std::vector<HtmlMetaVar*>();
  glMetaVars->push_back(new HtmlMetaVar("generator", "pdftohtml 0.36"));
  if( author ) glMetaVars->push_back(new HtmlMetaVar("author", author));
  if( keywords ) glMetaVars->push_back(new HtmlMetaVar("keywords", keywords));
  if( date ) glMetaVars->push_back(new HtmlMetaVar("date", date));
  if( subject ) glMetaVars->push_back(new HtmlMetaVar("subject", subject));

  maxPageWidth = 0;
  maxPageHeight = 0;

  pages->setDocName(fileName);
  Docname=new GooString (fileName);

  // for non-xml output (complex or simple) with frames generate the left frame
  if(!xml && !noframes)
  {
     if (!singleHtml)
     {
         GooString* left=new GooString(fileName);
         left->append("_ind.html");

         doFrame(firstPage);

         if (!(fContentsFrame = fopen(left->c_str(), "w")))
         {
             error(errIO, -1, "Couldn't open html file '{0:t}'", left);
             delete left;
             return;
         }
         delete left;
         fputs(DOCTYPE, fContentsFrame);
         fputs("<html xmlns=\"http://www.w3.org/1999/xhtml\" lang=\"\" xml:lang=\"\">\n<head>\n<title></title>\n</head>\n<body>\n", fContentsFrame);

         if (doOutline)
         {
             fprintf(fContentsFrame, "<a href=\"%s%s\" target=\"contents\">Outline</a><br/>",
                 gbasename(Docname->c_str()).c_str(),
                 complexMode ? "-outline.html" : "s.html#outline");
         }
     }
	if (!complexMode)
	{	/* not in complex mode */
		
       GooString* right=new GooString(fileName);
       right->append("s.html");

       if (!(page=fopen(right->c_str(),"w"))){
        error(errIO, -1, "Couldn't open html file '{0:t}'", right);
        delete right;
		return;
       }
       delete right;
       fputs(DOCTYPE, page);
       fputs("<html>\n<head>\n<title></title>\n",page);
       printCSS(page);
       fputs("</head>\n<body>\n",page);
     }
  }

  if (noframes) {
    if (stout) page=stdout;
    else {
      GooString* right=new GooString(fileName);
      if (!xml) right->append(".html");
      if (xml) right->append(".xml");
      if (!(page=fopen(right->c_str(),"w"))){
	error(errIO, -1, "Couldn't open html file '{0:t}'", right);
	delete right;
	return;
      }  
      delete right;
    }

    GooString *htmlEncoding = mapEncodingToHtml(globalParams->getTextEncodingName()); 
    if (xml) 
    {
      fprintf(page, "<?xml version=\"1.0\" encoding=\"%s\"?>\n", htmlEncoding->c_str());
      fputs("<!DOCTYPE pdf2xml SYSTEM \"pdf2xml.dtd\">\n\n", page);
      fprintf(page,"<pdf2xml producer=\"%s\" version=\"%s\">\n", PACKAGE_NAME, PACKAGE_VERSION);
    } 
    else 
    {
      fprintf(page,"%s\n<html xmlns=\"http://www.w3.org/1999/xhtml\" lang=\"\" xml:lang=\"\">\n<head>\n<title>%s</title>\n", DOCTYPE, docTitle->c_str());
      
      fprintf(page, "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=%s\"/>\n", htmlEncoding->c_str());
      
      dumpMetaVars(page);
      printCSS(page);
      fprintf(page,"</head>\n");
      fprintf(page,"<body bgcolor=\"#A0A0A0\" vlink=\"blue\" link=\"blue\">\n");
    }
    delete htmlEncoding;
  }
  ok = true; 
}

HtmlOutputDev::~HtmlOutputDev() {
    delete Docname;
    delete docTitle;

    for (auto entry : *glMetaVars) {
      delete entry;
    }
    delete glMetaVars;

    if (fContentsFrame){
      fputs("</body>\n</html>\n",fContentsFrame);  
      fclose(fContentsFrame);
    }
    if (page != nullptr) {
      if (xml) {
        fputs("</pdf2xml>\n",page);  
        fclose(page);
      } else
      if ( !complexMode || xml || noframes )
      { 
        fputs("</body>\n</html>\n",page);  
        fclose(page);
      }
    }
    if (pages)
      delete pages;
}

void HtmlOutputDev::startPage(int pageNum, GfxState *state, XRef *xref) {
#if 0
  if (mode&&!xml){
    if (write){
      write=false;
      GooString* fname=Dirname(Docname);
      fname->append("image.log");
      if((tin=fopen(getFileNameFromPath(fname->c_str(),fname->getLength()),"w"))==NULL){
	printf("Error : can not open %s",fname);
	exit(1);
      }
      delete fname;
    // if(state->getRotation()!=0) 
    //  fprintf(tin,"ROTATE=%d rotate %d neg %d neg translate\n",state->getRotation(),state->getX1(),-state->getY1());
    // else 
      fprintf(tin,"ROTATE=%d neg %d neg translate\n",state->getX1(),state->getY1());  
    }
  }
#endif

  this->pageNum = pageNum;
  const std::string str = gbasename(Docname->c_str());
  pages->clear(); 
  if(!noframes)
  {
    if (fContentsFrame)
	{
      if (complexMode)
		fprintf(fContentsFrame,"<a href=\"%s-%d.html\"", str.c_str(), pageNum);
      else 
		fprintf(fContentsFrame,"<a href=\"%ss.html#%d\"", str.c_str(), pageNum);
      fprintf(fContentsFrame," target=\"contents\" >Page %d</a><br/>\n",pageNum);
    }
  }

  pages->pageWidth=static_cast<int>(state->getPageWidth());
  pages->pageHeight=static_cast<int>(state->getPageHeight());
} 


void HtmlOutputDev::endPage() {
  Links *linksList = docPage->getLinks();
  for (int i = 0; i < linksList->getNumLinks(); ++i)
  {
      doProcessLink(linksList->getLink(i));
  }
  delete linksList;

  pages->conv();
  pages->coalesce();
  pages->dump(page, pageNum, backgroundImages);
  
  // I don't yet know what to do in the case when there are pages of different
  // sizes and we want complex output: running ghostscript many times 
  // seems very inefficient. So for now I'll just use last page's size
  maxPageWidth = pages->pageWidth;
  maxPageHeight = pages->pageHeight;
  
  //if(!noframes&&!xml) fputs("<br/>\n", fContentsFrame);
  if(!stout && !globalParams->getErrQuiet()) printf("Page-%d\n",(pageNum));
}

void HtmlOutputDev::addBackgroundImage(const std::string& img) {
  backgroundImages.push_back(img);
}

void HtmlOutputDev::updateFont(GfxState *state) {
  pages->updateFont(state);
}

void HtmlOutputDev::beginString(GfxState *state, const GooString *s) {
  pages->beginString(state, s);
}

void HtmlOutputDev::endString(GfxState *state) {
  pages->endString();
}

void HtmlOutputDev::drawChar(GfxState *state, double x, double y,
	      double dx, double dy,
	      double originX, double originY,
	      CharCode code, int /*nBytes*/, Unicode *u, int uLen) 
{
  if ( !showHidden && (state->getRender() & 3) == 3) {
    return;
  }
  pages->addChar(state, x, y, dx, dy, originX, originY, u, uLen);
}

void HtmlOutputDev::drawJpegImage(GfxState *state, Stream *str)
{
  InMemoryFile ims;
  FILE *f1 = nullptr;
  int c;

  // open the image file
  GooString *fName = createImageFileName("jpg");
  f1 = dataUrls ? ims.open("wb") : fopen(fName->c_str(), "wb");
  if (!f1) {
    error(errIO, -1, "Couldn't open image file '{0:t}'", fName);
    delete fName;
    return;
  }

  // initialize stream
  str = str->getNextStream();
  str->reset();

  // copy the stream
  while ((c = str->getChar()) != EOF)
    fputc(c, f1);

  fclose(f1);

  if (dataUrls) {
    delete fName;
    fName = new GooString(std::string("data:image/jpeg;base64,") + gbase64Encode(ims.getBuffer()));
  }
  pages->addImage(fName, state);
}

void HtmlOutputDev::drawPngImage(GfxState *state, Stream *str, int width, int height,
                                 GfxImageColorMap *colorMap, bool isMask)
{
#ifdef ENABLE_LIBPNG
  FILE *f1;
  InMemoryFile ims;

  if (!colorMap && !isMask) {
    error(errInternal, -1, "Can't have color image without a color map");
    return;
  }

  // open the image file
  GooString *fName=createImageFileName("png");
  f1 = dataUrls ? ims.open("wb") : fopen(fName->c_str(), "wb");
  if (!f1) {
    error(errIO, -1, "Couldn't open image file '{0:t}'", fName);
    delete fName;
    return;
  }

  PNGWriter *writer = new PNGWriter( isMask ? PNGWriter::MONOCHROME : PNGWriter::RGB );
  // TODO can we calculate the resolution of the image?
  if (!writer->init(f1, width, height, 72, 72)) {
    error(errInternal, -1, "Can't init PNG for image '{0:t}'", fName);
    delete writer;
    fclose(f1);
    return;
  }

  if (!isMask) {
    unsigned char *p;
    GfxRGB rgb;
    png_byte *row = (png_byte *) gmalloc(3 * width);   // 3 bytes/pixel: RGB
    png_bytep *row_pointer= &row;

    // Initialize the image stream
    ImageStream *imgStr = new ImageStream(str, width,
                        colorMap->getNumPixelComps(), colorMap->getBits());
    imgStr->reset();

    // For each line...
    for (int y = 0; y < height; y++) {

      // Convert into a PNG row
      p = imgStr->getLine();
      if (!p) {
        error(errIO, -1, "Failed to read PNG. '{0:t}' will be incorrect", fName);
        delete fName;
        gfree(row);
        delete writer;
        delete imgStr;
        fclose(f1);
        return;
      }
      for (int x = 0; x < width; x++) {
        colorMap->getRGB(p, &rgb);
        // Write the RGB pixels into the row
        row[3*x]= colToByte(rgb.r);
        row[3*x+1]= colToByte(rgb.g);
        row[3*x+2]= colToByte(rgb.b);
        p += colorMap->getNumPixelComps();
      }

      if (!writer->writeRow(row_pointer)) {
        error(errIO, -1, "Failed to write into PNG '{0:t}'", fName);
        delete writer;
        delete imgStr;
        fclose(f1);
        return;
      }
    }
    gfree(row);
    imgStr->close();
    delete imgStr;
  }
  else { // isMask == true
    int size = (width + 7)/8;

    // PDF masks use 0 = draw current color, 1 = leave unchanged.
    // We invert this to provide the standard interpretation of alpha
    // (0 = transparent, 1 = opaque). If the colorMap already inverts
    // the mask we leave the data unchanged.
    int invert_bits = 0xff;
    if (colorMap) {
      GfxGray gray;
      unsigned char zero[gfxColorMaxComps];
      memset(zero, 0, sizeof(zero));
      colorMap->getGray(zero, &gray);
      if (colToByte(gray) == 0)
        invert_bits = 0x00;
    }

    str->reset();
    unsigned char *png_row = (unsigned char *)gmalloc(size);

    for (int ri = 0; ri < height; ++ri)
    {
      for(int i = 0; i < size; i++)
        png_row[i] = str->getChar() ^ invert_bits;

      if (!writer->writeRow( &png_row ))
      {
        error(errIO, -1, "Failed to write into PNG '{0:t}'", fName);
        delete writer;
        fclose(f1);
        gfree(png_row);
        return;
      }
    }
    str->close();
    gfree(png_row);
  }

  str->close();

  writer->close();
  delete writer;
  fclose(f1);

  if (dataUrls) {
    delete fName;
    fName = new GooString(std::string("data:image/png;base64,") + gbase64Encode(ims.getBuffer()));
  }
  pages->addImage(fName, state);
#else
  return;
#endif
}

GooString *HtmlOutputDev::createImageFileName(const char *ext)
{
  return GooString::format("{0:s}-{1:d}_{2:d}.{3:s}", Docname->c_str(), pageNum, pages->getNumImages() + 1, ext);
}

void HtmlOutputDev::drawImageMask(GfxState *state, Object *ref, Stream *str,
				  int width, int height, bool invert,
				  bool interpolate, bool inlineImg) {

  if (ignore||(complexMode && !xml)) {
    OutputDev::drawImageMask(state, ref, str, width, height, invert, interpolate, inlineImg);
    return;
  }
  
  // dump JPEG file
  if (dumpJPEG  && str->getKind() == strDCT) {
    drawJpegImage(state, str);
  }
  else {
#ifdef ENABLE_LIBPNG
    drawPngImage(state, str, width, height, nullptr, true);
#else
    OutputDev::drawImageMask(state, ref, str, width, height, invert, interpolate, inlineImg);
#endif
  }
}

void HtmlOutputDev::drawImage(GfxState *state, Object *ref, Stream *str,
			      int width, int height, GfxImageColorMap *colorMap,
			      bool interpolate, int *maskColors, bool inlineImg) {

  if (ignore||(complexMode && !xml)) {
    OutputDev::drawImage(state, ref, str, width, height, colorMap, interpolate,
			 maskColors, inlineImg);
    return;
  }
  
  /*if( !globalParams->getErrQuiet() )
    printf("image stream of kind %d\n", str->getKind());*/
  // dump JPEG file
  if (dumpJPEG && str->getKind() == strDCT && (colorMap->getNumPixelComps() == 1 ||
	  colorMap->getNumPixelComps() == 3) && !inlineImg) {
    drawJpegImage(state, str);
  }
  else {
#ifdef ENABLE_LIBPNG
    drawPngImage(state, str, width, height, colorMap );
#else
    OutputDev::drawImage(state, ref, str, width, height, colorMap, interpolate,
                         maskColors, inlineImg);
#endif
  }
}


void HtmlOutputDev::doProcessLink(AnnotLink* link){
  double _x1,_y1,_x2,_y2;
  int x1,y1,x2,y2;

  link->getRect(&_x1,&_y1,&_x2,&_y2);
  cvtUserToDev(_x1,_y1,&x1,&y1);
  
  cvtUserToDev(_x2,_y2,&x2,&y2); 


  GooString* _dest=getLinkDest(link);
  HtmlLink t((double) x1,(double) y2,(double) x2,(double) y1,_dest);
  pages->AddLink(t);
  delete _dest;
}

GooString* HtmlOutputDev::getLinkDest(AnnotLink *link){
  if (!link->getAction())
    return new GooString();
  switch(link->getAction()->getKind()) 
  {
      case actionGoTo:
	  {
	  GooString* file = new GooString(gbasename(Docname->c_str()));
	  int page=1;
	  LinkGoTo *ha=(LinkGoTo *)link->getAction();
	  LinkDest *dest=nullptr;
	  if (ha->getDest()!=nullptr)
	      dest=ha->getDest()->copy();
	  else if (ha->getNamedDest()!=nullptr)
	      dest=catalog->findDest(ha->getNamedDest());
	      
	  if (dest){ 
	      if (dest->isPageRef()){
		  const Ref pageref=dest->getPageRef();
		  page=catalog->findPage(pageref);
	      }
	      else {
		  page=dest->getPageNum();
	      }

	      delete dest;

	      GooString *str=GooString::fromInt(page);
	      /* 		complex 	simple
	       	frames		file-4.html	files.html#4
		noframes	file.html#4	file.html#4
	       */
	      if (noframes)
	      {
		  file->append(".html#");
		  file->append(str);
	      }
	      else
	      {
	      	if( complexMode ) 
		{
		    file->append("-");
		    file->append(str);
		    file->append(".html");
		}
		else
		{
		    file->append("s.html#");
		    file->append(str);
		}
	      }

	      if (printCommands) printf(" link to page %d ",page);
	      delete str;
	      return file;
	  }
	  else 
	  {
	      return new GooString();
	  }
	  }
      case actionGoToR:
	  {
	  LinkGoToR *ha=(LinkGoToR *) link->getAction();
	  LinkDest *dest=nullptr;
	  int page=1;
	  GooString *file=new GooString();
	  if (ha->getFileName()){
	      delete file;
	      file=new GooString(ha->getFileName()->c_str());
	  }
	  if (ha->getDest()!=nullptr)  dest=ha->getDest()->copy();
	  if (dest&&file){
	      if (!(dest->isPageRef()))  page=dest->getPageNum();
	      delete dest;

	      if (printCommands) printf(" link to page %d ",page);
	      if (printHtml){
		  const char *p=file->c_str()+file->getLength()-4;
		  if (!strcmp(p, ".pdf") || !strcmp(p, ".PDF")){
		      file->del(file->getLength()-4,4);
		      file->append(".html");
		  }
		  file->append('#');
		  GooString *pgNum = GooString::fromInt(page);
		  file->append(pgNum);
		  delete pgNum;
	      }
	  }
	  if (printCommands && file) printf("filename %s\n",file->c_str());
	  return file;
	  }
      case actionURI:
	  { 
	  LinkURI *ha=(LinkURI *) link->getAction();
	  GooString* file=new GooString(ha->getURI()->c_str());
	  // printf("uri : %s\n",file->c_str());
	  return file;
	  }
      case actionLaunch:
	  if (printHtml) {
	      LinkLaunch *ha=(LinkLaunch *) link->getAction();
	      GooString* file=new GooString(ha->getFileName()->c_str());
	      const char *p=file->c_str()+file->getLength()-4;
	      if (!strcmp(p, ".pdf") || !strcmp(p, ".PDF")){
		  file->del(file->getLength()-4,4);
		  file->append(".html");
	      }
	      if (printCommands) printf("filename %s",file->c_str());
    
	      return file;      
  
	  }
	  // fallthrough
      default:
	  return new GooString();
  }
}

void HtmlOutputDev::dumpMetaVars(FILE *file)
{
  GooString *var;

  for(std::size_t i = 0; i < glMetaVars->size(); i++)
  {
     HtmlMetaVar *t = (*glMetaVars)[i];
     var = t->toString(); 
     fprintf(file, "%s\n", var->c_str());
     delete var;
  }
}

bool HtmlOutputDev::dumpDocOutline(PDFDoc* doc)
{ 
	FILE * output = nullptr;
	bool bClose = false;

	if (!ok)
                return false;
  
	Outline *outline = doc->getOutline();
	if (!outline)
		return false;

	const std::vector<OutlineItem*> *outlines = outline->getItems();
	if (!outlines)
		return false;
  
	if (!complexMode || xml)
  	{
		output = page;
  	}
  	else if (complexMode && !xml)
	{
		if (noframes)
		{
			output = page; 
			fputs("<hr/>\n", output);
		}
		else
		{
			GooString *str = Docname->copy();
			str->append("-outline.html");
			output = fopen(str->c_str(), "w");
			delete str;
			if (output == nullptr)
				return false;
			bClose = true;

			GooString *htmlEncoding =
				HtmlOutputDev::mapEncodingToHtml(globalParams->getTextEncodingName());

			fprintf(output, "<html xmlns=\"http://www.w3.org/1999/xhtml\" " \
                                "lang=\"\" xml:lang=\"\">\n"            \
                                "<head>\n"                              \
                                "<title>Document Outline</title>\n"     \
                                "<meta http-equiv=\"Content-Type\" content=\"text/html; " \
                                "charset=%s\"/>\n"                      \
                                "</head>\n<body>\n", htmlEncoding->c_str());
			delete htmlEncoding;
		}
	}
 
	if (!xml)
	{
		bool done = newHtmlOutlineLevel(output, outlines);
		if (done && !complexMode)
			fputs("<hr/>\n", output);
	
		if (bClose)
		{
			fputs("</body>\n</html>\n", output);
			fclose(output);
		}
	}
	else
		newXmlOutlineLevel(output, outlines);

	return true;
}

bool HtmlOutputDev::newHtmlOutlineLevel(FILE *output, const std::vector<OutlineItem*> *outlines, int level)
{
	bool atLeastOne = false;

	if (level == 1)
	{
		fputs("<a name=\"outline\"></a>", output);
		fputs("<h1>Document Outline</h1>\n", output);
	}
	fputs("<ul>\n",output);

	for (std::size_t i = 0; i < outlines->size(); i++)
	{
		OutlineItem *item = (*outlines)[i];
		GooString *titleStr = HtmlFont::HtmlFilter(item->getTitle(),
							   item->getTitleLength());

		GooString *linkName = nullptr;;
        int page = getOutlinePageNum(item);
        if (page > 0)
        {
				/*		complex		simple
				frames		file-4.html	files.html#4
				noframes	file.html#4	file.html#4
				*/
				linkName = new GooString(gbasename(Docname->c_str()));
				GooString *str=GooString::fromInt(page);
				if (noframes) {
					linkName->append(".html#");
					linkName->append(str);
				} else {
					if( complexMode ) {
						linkName->append("-");
						linkName->append(str);
						linkName->append(".html");
					} else {
						linkName->append("s.html#");
						linkName->append(str);
					}
				}
				delete str;
		}

		fputs("<li>",output);
		if (linkName)
			fprintf(output,"<a href=\"%s\">", linkName->c_str());
		fputs(titleStr->c_str(),output);
		if (linkName) {
			fputs("</a>",output);
			delete linkName;
		}
		delete titleStr;
		atLeastOne = true;

		item->open();
		if (item->hasKids() && item->getKids())
		{
			fputs("\n",output);
			newHtmlOutlineLevel(output, item->getKids(), level+1);
		}
		item->close();
		fputs("</li>\n",output);
	}
	fputs("</ul>\n",output);

	return atLeastOne;
}

void HtmlOutputDev::newXmlOutlineLevel(FILE *output, const std::vector<OutlineItem*> *outlines)
{
    fputs("<outline>\n", output);

    for (std::size_t i = 0; i < outlines->size(); i++)
    {
        OutlineItem *item     = (*outlines)[i];
        GooString   *titleStr = HtmlFont::HtmlFilter(item->getTitle(),
                                                     item->getTitleLength());
        int page = getOutlinePageNum(item);
        if (page > 0)
        {
            fprintf(output, "<item page=\"%d\">%s</item>\n",
                    page, titleStr->c_str());
        }
        else
        {
            fprintf(output, "<item>%s</item>\n", titleStr->c_str());
        }
        delete titleStr;

        item->open();
        if (item->hasKids() && item->getKids())
        {
            newXmlOutlineLevel(output, item->getKids());
        }
        item->close();
    }    

    fputs("</outline>\n", output);
}

int HtmlOutputDev::getOutlinePageNum(OutlineItem *item)
{
    const LinkAction *action   = item->getAction();
    const LinkGoTo   *link     = nullptr;
    LinkDest   *linkdest = nullptr;
    int         pagenum  = -1;

    if (!action || action->getKind() != actionGoTo)
        return pagenum;

    link = dynamic_cast<const LinkGoTo*>(action);

    if (!link || !link->isOk())
        return pagenum;

    if (link->getDest())
        linkdest = link->getDest()->copy();
    else if (link->getNamedDest())
        linkdest = catalog->findDest(link->getNamedDest());

    if (!linkdest)
        return pagenum;

    if (linkdest->isPageRef()) {
        const Ref pageref = linkdest->getPageRef();
        pagenum = catalog->findPage(pageref);
    } else {
        pagenum = linkdest->getPageNum();
    }

    delete linkdest;
    return pagenum;
}