source/libs/poppler/poppler-src/poppler/Outline.cc

   1 //========================================================================
   2 //
   3 // Outline.cc
   4 //
   5 // Copyright 2002-2003 Glyph & Cog, LLC
   6 //
   7 //========================================================================
   8
   9 //========================================================================
  10 //
  11 // Modified under the Poppler project - http://poppler.freedesktop.org
  12 //
  13 // All changes made under the Poppler project to this file are licensed
  14 // under GPL version 2 or later
  15 //
  16 // Copyright (C) 2005 Marco Pesenti Gritti <mpg@redhat.com>
  17 // Copyright (C) 2008, 2016 Albert Astals Cid <aacid@kde.org>
  18 // Copyright (C) 2009 Nick Jones <nick.jones@network-box.com>
  19 // Copyright (C) 2016 Jason Crain <jason@aquaticape.us>
  20 //
  21 // To see a description of the changes please see the Changelog file that
  22 // came with your tarball or type make ChangeLog if you are building from git
  23 //
  24 //========================================================================
  25
  26 #include <config.h>
  27
  28 #ifdef USE_GCC_PRAGMAS
  29 #pragma implementation
  30 #endif
  31
  32 #include "goo/gmem.h"
  33 #include "goo/GooString.h"
  34 #include "goo/GooList.h"
  35 #include "XRef.h"
  36 #include "Link.h"
  37 #include "PDFDocEncoding.h"
  38 #include "Outline.h"
  39 #include "UTF.h"
  40
  41 //------------------------------------------------------------------------
  42
  43 Outline::Outline(Object *outlineObj, XRef *xref) {
  44   Object first, last;
  45
  46   items = NULL;
  47   if (!outlineObj->isDict()) {
  48     return;
  49   }
  50   items = OutlineItem::readItemList(outlineObj->dictLookupNF("First", &first), xref);
  51   first.free();
  52   last.free();
  53 }
  54
  55 Outline::~Outline() {
  56   if (items) {
  57     deleteGooList(items, OutlineItem);
  58   }
  59 }
  60
  61 //------------------------------------------------------------------------
  62
  63 OutlineItem::OutlineItem(Dict *dict, XRef *xrefA) {
  64   Object obj1;
  65   GooString *s;
  66
  67   xref = xrefA;
  68   title = NULL;
  69   action = NULL;
  70   kids = NULL;
  71
  72   if (dict->lookup("Title", &obj1)->isString()) {
  73     s = obj1.getString();
  74     titleLen = TextStringToUCS4(s, &title);
  75   } else {
  76     titleLen = 0;
  77   }
  78   obj1.free();
  79
  80   if (!dict->lookup("Dest", &obj1)->isNull()) {
  81     action = LinkAction::parseDest(&obj1);
  82   } else {
  83       obj1.free();
  84     if (!dict->lookup("A", &obj1)->isNull()) {
  85         action = LinkAction::parseAction(&obj1);
  86   }
  87   }
  88   obj1.free();
  89
  90   dict->lookupNF("First", &firstRef);
  91   dict->lookupNF("Last", &lastRef);
  92   dict->lookupNF("Next", &nextRef);
  93
  94   startsOpen = gFalse;
  95   if (dict->lookup("Count", &obj1)->isInt()) {
  96     if (obj1.getInt() > 0) {
  97       startsOpen = gTrue;
  98     }
  99   }
 100   obj1.free();
 101 }
 102
 103 OutlineItem::~OutlineItem() {
 104   close();
 105   if (title) {
 106     gfree(title);
 107   }
 108   if (action) {
 109     delete action;
 110   }
 111   firstRef.free();
 112   lastRef.free();
 113   nextRef.free();
 114 }
 115
 116 GooList *OutlineItem::readItemList(Object *firstItemRef, XRef *xrefA) {
 117   GooList *items;
 118   char* alreadyRead;
 119   OutlineItem *item;
 120   Object obj;
 121   Object *p;
 122
 123   items = new GooList();
 124
 125   alreadyRead = (char *)gmalloc(xrefA->getNumObjects());
 126   memset(alreadyRead, 0, xrefA->getNumObjects());
 127
 128   p = firstItemRef;
 129   while (p->isRef() &&
 130          (p->getRefNum() >= 0) &&
 131          (p->getRefNum() < xrefA->getNumObjects()) &&
 132          !alreadyRead[p->getRefNum()]) {
 133     if (!p->fetch(xrefA, &obj)->isDict()) {
 134       obj.free();
 135       break;
 136     }
 137     alreadyRead[p->getRefNum()] = 1;
 138     item = new OutlineItem(obj.getDict(), xrefA);
 139     obj.free();
 140     items->append(item);
 141     p = &item->nextRef;
 142   }
 143
 144   gfree(alreadyRead);
 145
 146   if (!items->getLength()) {
 147     delete items;
 148     items = NULL;
 149   }
 150
 151   return items;
 152 }
 153
 154 void OutlineItem::open() {
 155   if (!kids) {
 156     kids = readItemList(&firstRef, xref);
 157   }
 158 }
 159
 160 void OutlineItem::close() {
 161   if (kids) {
 162     deleteGooList(kids, OutlineItem);
 163     kids = NULL;
 164   }
 165 }