cpp/poppler-embedded-file.cpp   |   13 ++-
 cpp/poppler-private.cpp         |    4 -
 cpp/poppler-private.h           |    3 
 cpp/poppler-toc-private.h       |    4 -
 cpp/poppler-toc.cpp             |    9 +-
 glib/poppler-action.cc          |   50 +++++++-------
 glib/poppler-document.cc        |    8 +-
 glib/poppler-layer.cc           |    2 
 glib/poppler-media.cc           |    4 -
 glib/poppler-movie.cc           |    2 
 glib/poppler-private.h          |    6 -
 goo/GooList.cc                  |   16 ++++
 goo/GooList.h                   |    8 +-
 poppler/FileSpec.cc             |   10 +-
 poppler/FileSpec.h              |   26 +++----
 poppler/Function.h              |    2 
 poppler/Link.cc                 |   26 +++----
 poppler/Link.h                  |  138 ++++++++++++++++++++--------------------
 poppler/Movie.cc                |   12 +--
 poppler/Movie.h                 |   26 +++----
 poppler/OptionalContent.cc      |    8 +-
 poppler/OptionalContent.h       |   14 ++--
 poppler/Outline.cc              |   10 +-
 poppler/Outline.h               |   20 ++---
 poppler/Rendition.cc            |    4 -
 poppler/Rendition.h             |   18 ++---
 poppler/Sound.cc                |    6 -
 poppler/Sound.h                 |   18 ++---
 qt5/src/poppler-document.cc     |    4 -
 qt5/src/poppler-embeddedfile.cc |   10 +-
 qt5/src/poppler-link.cc         |    4 -
 qt5/src/poppler-media.cc        |    2 
 qt5/src/poppler-movie.cc        |    4 -
 qt5/src/poppler-optcontent.cc   |    4 -
 qt5/src/poppler-private.cc      |   24 +++---
 qt5/src/poppler-private.h       |    8 +-
 qt5/src/poppler-sound.cc        |    2 
 utils/HtmlFonts.cc              |    4 -
 utils/HtmlFonts.h               |    2 
 utils/HtmlOutputDev.cc          |   12 +--
 utils/HtmlOutputDev.h           |    4 -
 utils/pdfdetach.cc              |    2 
 42 files changed, 285 insertions(+), 268 deletions(-)

New commits:
commit b4127fb1c45fe5dcabe3751f0b40029405224f49
Author: Albert Astals Cid <aa...@kde.org>
Date:   Fri Apr 6 23:08:15 2018 +0200

    Add some more const
    
    const is always good :)

diff --git a/cpp/poppler-embedded-file.cpp b/cpp/poppler-embedded-file.cpp
index 0ed5a6be..bf7ab4d7 100644
--- a/cpp/poppler-embedded-file.cpp
+++ b/cpp/poppler-embedded-file.cpp
@@ -1,6 +1,7 @@
 /*
  * Copyright (C) 2009-2011, Pino Toscano <p...@kde.org>
  * Copyright (C) 2016 Jakub Alba <jakuba...@gmail.com>
+ * Copyright (C) 2018 Albert Astals Cid <aa...@kde.org>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -78,7 +79,7 @@ bool embedded_file::is_valid() const
  */
 std::string embedded_file::name() const
 {
-    GooString *goo = d->file_spec->getFileName();
+    const GooString *goo = d->file_spec->getFileName();
     return goo ? std::string(goo->getCString()) : std::string();
 }
 
@@ -87,7 +88,7 @@ std::string embedded_file::name() const
  */
 ustring embedded_file::description() const
 {
-    GooString *goo = d->file_spec->getDescription();
+    const GooString *goo = d->file_spec->getDescription();
     return goo ? detail::unicode_GooString_to_ustring(goo) : ustring();
 }
 
@@ -108,7 +109,7 @@ int embedded_file::size() const
  */
 time_type embedded_file::modification_date() const
 {
-    GooString *goo = d->file_spec->getEmbeddedFile()->modDate();
+    const GooString *goo = d->file_spec->getEmbeddedFile()->modDate();
     return goo ? dateStringToTime(goo) : time_type(-1);
 }
 
@@ -118,7 +119,7 @@ time_type embedded_file::modification_date() const
  */
 time_type embedded_file::creation_date() const
 {
-    GooString *goo = d->file_spec->getEmbeddedFile()->createDate();
+    const GooString *goo = d->file_spec->getEmbeddedFile()->createDate();
     return goo ? dateStringToTime(goo) : time_type(-1);
 }
 
@@ -127,7 +128,7 @@ time_type embedded_file::creation_date() const
  */
 byte_array embedded_file::checksum() const
 {
-    GooString *cs = d->file_spec->getEmbeddedFile()->checksum();
+    const GooString *cs = d->file_spec->getEmbeddedFile()->checksum();
     if (!cs) {
         return byte_array();
     }
@@ -144,7 +145,7 @@ byte_array embedded_file::checksum() const
  */
 std::string embedded_file::mime_type() const
 {
-    GooString *goo = d->file_spec->getEmbeddedFile()->mimeType();
+    const GooString *goo = d->file_spec->getEmbeddedFile()->mimeType();
     return goo ? std::string(goo->getCString()) : std::string();
 }
 
diff --git a/cpp/poppler-private.cpp b/cpp/poppler-private.cpp
index d326d1b3..4de2256b 100644
--- a/cpp/poppler-private.cpp
+++ b/cpp/poppler-private.cpp
@@ -3,7 +3,7 @@
  * Copyright (C) 2013 Adrian Johnson <ajohn...@redneon.com>
  * Copyright (C) 2014, Hans-Peter Deifel <hpdei...@gmx.de>
  * Copyright (C) 2016 Jakub Alba <jakuba...@gmail.com>
- * Copyright (C) 2017 Albert Astals Cid <aa...@kde.org>
+ * Copyright (C) 2017, 2018 Albert Astals Cid <aa...@kde.org>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -56,7 +56,7 @@ rectf detail::pdfrectangle_to_rectf(const PDFRectangle 
&pdfrect)
     return rectf(pdfrect.x1, pdfrect.y1, pdfrect.x2 - pdfrect.x1, pdfrect.y2 - 
pdfrect.y1);
 }
 
-ustring detail::unicode_GooString_to_ustring(GooString *str)
+ustring detail::unicode_GooString_to_ustring(const GooString *str)
 {
     const char *data = str->getCString();
     const int len = str->getLength();
diff --git a/cpp/poppler-private.h b/cpp/poppler-private.h
index d954bdb2..501c4fc4 100644
--- a/cpp/poppler-private.h
+++ b/cpp/poppler-private.h
@@ -5,6 +5,7 @@
  * Copyright (C) 2016 Jakub Alba <jakuba...@gmail.com>
  * Copyright (C) 2018, Suzuki Toshiya <mpsuz...@hiroshima-u.ac.jp>
  * Copyright (C) 2018, Adam Reichold <adam.reich...@t-online.de>
+ * Copyright (C) 2018 Albert Astals Cid <aa...@kde.org>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -49,7 +50,7 @@ void error_function(void *data, ErrorCategory category, 
Goffset pos, char *msg);
 
 rectf pdfrectangle_to_rectf(const PDFRectangle &pdfrect);
 
-ustring unicode_GooString_to_ustring(GooString *str);
+ustring unicode_GooString_to_ustring(const GooString *str);
 ustring unicode_to_ustring(const Unicode *u, int length);
 GooString* ustring_to_unicode_GooString(const ustring &str);
 
diff --git a/cpp/poppler-toc-private.h b/cpp/poppler-toc-private.h
index 29d439e5..a8ea8630 100644
--- a/cpp/poppler-toc-private.h
+++ b/cpp/poppler-toc-private.h
@@ -53,8 +53,8 @@ public:
     toc_item_private(const toc_item_private &) = delete;
     toc_item_private& operator=(const toc_item_private &) = delete;
 
-    void load(OutlineItem *item);
-    void load_children(GooList *items);
+    void load(const OutlineItem *item);
+    void load_children(const GooList *items);
 
     std::vector<toc_item*> children;
     ustring title;
diff --git a/cpp/poppler-toc.cpp b/cpp/poppler-toc.cpp
index a2f74ccd..01402370 100644
--- a/cpp/poppler-toc.cpp
+++ b/cpp/poppler-toc.cpp
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2009-2010, Pino Toscano <p...@kde.org>
+ * Copyright (C) 2018, Albert Astals Cid <aa...@kde.org>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -40,7 +41,7 @@ toc* toc_private::load_from_outline(Outline *outline)
         return nullptr;
     }
 
-    GooList *items = outline->getItems();
+    const GooList *items = outline->getItems();
     if (!items || items->getLength() < 1) {
         return nullptr;
     }
@@ -62,7 +63,7 @@ toc_item_private::~toc_item_private()
     delete_all(children);
 }
 
-void toc_item_private::load(OutlineItem *item)
+void toc_item_private::load(const OutlineItem *item)
 {
     const Unicode *title_unicode = item->getTitle();
     const int title_length = item->getTitleLength();
@@ -70,7 +71,7 @@ void toc_item_private::load(OutlineItem *item)
     is_open = item->isOpen();
 }
 
-void toc_item_private::load_children(GooList *items)
+void toc_item_private::load_children(const GooList *items)
 {
     const int num_items = items->getLength();
     children.resize(num_items);
@@ -82,7 +83,7 @@ void toc_item_private::load_children(GooList *items)
         children[i] = new_item;
 
         item->open();
-        GooList *item_children = item->getKids();
+        const GooList *item_children = item->getKids();
         if (item_children) {
             new_item->d->load_children(item_children);
         }
diff --git a/glib/poppler-action.cc b/glib/poppler-action.cc
index 03a63c23..3fbd3984 100644
--- a/glib/poppler-action.cc
+++ b/glib/poppler-action.cc
@@ -232,7 +232,7 @@ poppler_action_copy (PopplerAction *action)
 static
 PopplerDest *
 dest_new_goto (PopplerDocument *document,
-              LinkDest        *link_dest)
+              const LinkDest        *link_dest)
 {
        PopplerDest *dest;
 
@@ -337,9 +337,9 @@ dest_new_named (const GooString *named_dest)
 static void
 build_goto_dest (PopplerDocument *document,
                 PopplerAction   *action,
-                LinkGoTo        *link)
+                const LinkGoTo        *link)
 {
-       LinkDest *link_dest;
+       const LinkDest *link_dest;
        const GooString *named_dest;
 
        /* Return if it isn't OK */
@@ -362,9 +362,9 @@ build_goto_dest (PopplerDocument *document,
 
 static void
 build_goto_remote (PopplerAction *action,
-                  LinkGoToR     *link)
+                  const LinkGoToR     *link)
 {
-       LinkDest *link_dest;
+       const LinkDest *link_dest;
        const GooString *named_dest;
        
        /* Return if it isn't OK */
@@ -389,7 +389,7 @@ build_goto_remote (PopplerAction *action,
 
 static void
 build_launch (PopplerAction *action,
-             LinkLaunch    *link)
+             const LinkLaunch    *link)
 {
        if (link->getFileName()) {
                action->launch.file_name = g_strdup 
(link->getFileName()->getCString ());
@@ -401,7 +401,7 @@ build_launch (PopplerAction *action,
 
 static void
 build_uri (PopplerAction *action,
-          LinkURI       *link)
+          const LinkURI       *link)
 {
        const gchar *uri;
 
@@ -412,7 +412,7 @@ build_uri (PopplerAction *action,
 
 static void
 build_named (PopplerAction *action,
-            LinkNamed     *link)
+            const LinkNamed     *link)
 {
        const gchar *name;
 
@@ -423,14 +423,14 @@ build_named (PopplerAction *action,
 
 static AnnotMovie *
 find_annot_movie_for_action (PopplerDocument *document,
-                            LinkMovie       *link)
+                            const LinkMovie       *link)
 {
   AnnotMovie *annot = nullptr;
   XRef *xref = document->doc->getXRef ();
   Object annotObj;
 
   if (link->hasAnnotRef ()) {
-    Ref *ref = link->getAnnotRef ();
+    const Ref *ref = link->getAnnotRef ();
 
     annotObj = xref->fetch (ref->num, ref->gen);
   } else if (link->hasAnnotTitle ()) {
@@ -490,7 +490,7 @@ find_annot_movie_for_action (PopplerDocument *document,
 static void
 build_movie (PopplerDocument *document,
             PopplerAction   *action,
-            LinkMovie       *link)
+            const LinkMovie       *link)
 {
        AnnotMovie *annot;
 
@@ -519,7 +519,7 @@ build_movie (PopplerDocument *document,
 
 static void
 build_javascript (PopplerAction *action,
-                 LinkJavaScript *link)
+                 const LinkJavaScript *link)
 {
        const GooString *script;
 
@@ -531,7 +531,7 @@ build_javascript (PopplerAction *action,
 
 static void
 build_rendition (PopplerAction *action,
-                LinkRendition *link)
+                const LinkRendition *link)
 {
        action->rendition.op = link->getOperation();
        if (link->hasRenditionObject())
@@ -575,9 +575,9 @@ get_layer_for_ref (PopplerDocument *document,
 static void
 build_ocg_state (PopplerDocument *document,
                 PopplerAction   *action,
-                LinkOCGState    *ocg_state)
+                const LinkOCGState    *ocg_state)
 {
-       GooList *st_list = ocg_state->getStateList();
+       const GooList *st_list = ocg_state->getStateList();
        GBool    preserve_rb = ocg_state->getPreserveRB();
        gint     i, j;
        GList   *layer_state = nullptr;
@@ -618,7 +618,7 @@ build_ocg_state (PopplerDocument *document,
 
 PopplerAction *
 _poppler_action_new (PopplerDocument *document,
-                    LinkAction      *link,
+                    const LinkAction      *link,
                     const gchar     *title)
 {
        PopplerAction *action;
@@ -636,39 +636,39 @@ _poppler_action_new (PopplerDocument *document,
        switch (link->getKind ()) {
        case actionGoTo:
                action->type = POPPLER_ACTION_GOTO_DEST;
-               build_goto_dest (document, action, dynamic_cast <LinkGoTo *> 
(link));
+               build_goto_dest (document, action, dynamic_cast <const LinkGoTo 
*> (link));
                break;
        case actionGoToR:
                action->type = POPPLER_ACTION_GOTO_REMOTE;
-               build_goto_remote (action, dynamic_cast <LinkGoToR *> (link));
+               build_goto_remote (action, dynamic_cast <const LinkGoToR *> 
(link));
                break;
        case actionLaunch:
                action->type = POPPLER_ACTION_LAUNCH;
-               build_launch (action, dynamic_cast <LinkLaunch *> (link));
+               build_launch (action, dynamic_cast <const LinkLaunch *> (link));
                break;
        case actionURI:
                action->type = POPPLER_ACTION_URI;
-               build_uri (action, dynamic_cast <LinkURI *> (link));
+               build_uri (action, dynamic_cast <const LinkURI *> (link));
                break;
        case actionNamed:
                action->type = POPPLER_ACTION_NAMED;
-               build_named (action, dynamic_cast <LinkNamed *> (link));
+               build_named (action, dynamic_cast <const LinkNamed *> (link));
                break;
        case actionMovie:
                action->type = POPPLER_ACTION_MOVIE;
-               build_movie (document, action, dynamic_cast<LinkMovie*> (link));
+               build_movie (document, action, dynamic_cast<const LinkMovie*> 
(link));
                break;
        case actionRendition:
                action->type = POPPLER_ACTION_RENDITION;
-               build_rendition (action, dynamic_cast<LinkRendition*> (link));
+               build_rendition (action, dynamic_cast<const LinkRendition*> 
(link));
                break;
        case actionOCGState:
                action->type = POPPLER_ACTION_OCG_STATE;
-               build_ocg_state (document, action, dynamic_cast<LinkOCGState*> 
(link));
+               build_ocg_state (document, action, dynamic_cast<const 
LinkOCGState*> (link));
                break;
        case actionJavaScript:
                action->type = POPPLER_ACTION_JAVASCRIPT;
-               build_javascript (action, dynamic_cast<LinkJavaScript*> (link));
+               build_javascript (action, dynamic_cast<const LinkJavaScript*> 
(link));
                break;
        case actionUnknown:
        default:
diff --git a/glib/poppler-document.cc b/glib/poppler-document.cc
index 98fa10e9..b343eb90 100644
--- a/glib/poppler-document.cc
+++ b/glib/poppler-document.cc
@@ -1735,7 +1735,7 @@ poppler_document_init (PopplerDocument *document)
 struct _PopplerIndexIter
 {
        PopplerDocument *document;
-       GooList *items;
+       const GooList *items;
        int index;
 };
 
@@ -1810,7 +1810,7 @@ poppler_index_iter_new (PopplerDocument *document)
 {
        PopplerIndexIter *iter;
        Outline *outline;
-       GooList *items;
+       const GooList *items;
 
        outline = document->doc->getOutline();
        if (outline == nullptr)
@@ -1860,7 +1860,7 @@ poppler_index_iter_get_child (PopplerIndexIter *parent)
 }
 
 static gchar *
-unicode_to_char (Unicode *unicode,
+unicode_to_char (const Unicode *unicode,
                 int      len)
 {
        static UnicodeMap *uMap = nullptr;
@@ -1916,7 +1916,7 @@ PopplerAction *
 poppler_index_iter_get_action (PopplerIndexIter  *iter)
 {
        OutlineItem *item;
-       LinkAction *link_action;
+       const LinkAction *link_action;
        PopplerAction *action;
        gchar *title;
 
diff --git a/glib/poppler-layer.cc b/glib/poppler-layer.cc
index f97b8b61..c7fec2e7 100644
--- a/glib/poppler-layer.cc
+++ b/glib/poppler-layer.cc
@@ -75,7 +75,7 @@ _poppler_layer_new (PopplerDocument *document,
                    GList           *rbgroup)
 {
   PopplerLayer *poppler_layer;
-  GooString    *layer_name;
+  const GooString    *layer_name;
 
   g_return_val_if_fail (POPPLER_IS_DOCUMENT (document), NULL);
   g_return_val_if_fail (layer != nullptr, NULL);
diff --git a/glib/poppler-media.cc b/glib/poppler-media.cc
index 309c0d46..b7afa9ab 100644
--- a/glib/poppler-media.cc
+++ b/glib/poppler-media.cc
@@ -84,7 +84,7 @@ poppler_media_init (PopplerMedia *media)
 }
 
 PopplerMedia *
-_poppler_media_new (MediaRendition *poppler_media)
+_poppler_media_new (const MediaRendition *poppler_media)
 {
   PopplerMedia *media;
 
@@ -93,7 +93,7 @@ _poppler_media_new (MediaRendition *poppler_media)
   media = POPPLER_MEDIA (g_object_new (POPPLER_TYPE_MEDIA, nullptr));
 
   if (poppler_media->getIsEmbedded()) {
-    GooString* mime_type;
+    const GooString* mime_type;
 
     media->stream = poppler_media->getEmbbededStreamObject()->copy();
     mime_type = poppler_media->getContentType();
diff --git a/glib/poppler-movie.cc b/glib/poppler-movie.cc
index 894ae182..3bbc2298 100644
--- a/glib/poppler-movie.cc
+++ b/glib/poppler-movie.cc
@@ -74,7 +74,7 @@ poppler_movie_init (PopplerMovie *movie)
 }
 
 PopplerMovie *
-_poppler_movie_new (Movie *poppler_movie)
+_poppler_movie_new (const Movie *poppler_movie)
 {
   PopplerMovie *movie;
 
diff --git a/glib/poppler-private.h b/glib/poppler-private.h
index 7a0225d7..f2080472 100644
--- a/glib/poppler-private.h
+++ b/glib/poppler-private.h
@@ -112,7 +112,7 @@ PopplerPage   *_poppler_page_new   (PopplerDocument 
*document,
                                    Page            *page,
                                    int              index);
 PopplerAction *_poppler_action_new (PopplerDocument *document,
-                                   LinkAction      *link,
+                                   const LinkAction      *link,
                                    const gchar     *title);
 PopplerLayer  *_poppler_layer_new (PopplerDocument  *document,
                                   Layer            *layer,
@@ -122,8 +122,8 @@ PopplerDest   *_poppler_dest_new_goto (PopplerDocument 
*document,
 PopplerFormField *_poppler_form_field_new (PopplerDocument *document,
                                           FormWidget      *field);
 PopplerAttachment *_poppler_attachment_new (FileSpec *file);
-PopplerMovie      *_poppler_movie_new (Movie *movie);
-PopplerMedia      *_poppler_media_new (MediaRendition *media);
+PopplerMovie      *_poppler_movie_new (const Movie *movie);
+PopplerMedia      *_poppler_media_new (const MediaRendition *media);
 PopplerAnnot      *_poppler_annot_new           (Annot *annot);
 PopplerAnnot      *_poppler_annot_text_new      (Annot *annot);
 PopplerAnnot      *_poppler_annot_free_text_new (Annot *annot);
diff --git a/goo/GooList.cc b/goo/GooList.cc
index 6ce4952d..e0e4875b 100644
--- a/goo/GooList.cc
+++ b/goo/GooList.cc
@@ -6,6 +6,20 @@
 //
 //========================================================================
 
+//========================================================================
+//
+// 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) 2018 Albert Astals Cid <aa...@kde.org>
+//
+// 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>
 
 #ifdef USE_GCC_PRAGMAS
@@ -39,7 +53,7 @@ GooList::~GooList() {
   gfree(data);
 }
 
-GooList *GooList::copy() {
+GooList *GooList::copy() const {
   GooList *ret;
 
   ret = new GooList(length);
diff --git a/goo/GooList.h b/goo/GooList.h
index c83a0e36..a0bc525d 100644
--- a/goo/GooList.h
+++ b/goo/GooList.h
@@ -13,7 +13,7 @@
 // All changes made under the Poppler project to this file are licensed
 // under GPL version 2 or later
 //
-// Copyright (C) 2012 Albert Astals Cid <aa...@kde.org>
+// Copyright (C) 2012, 2018 Albert Astals Cid <aa...@kde.org>
 //
 // 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
@@ -48,16 +48,16 @@ public:
   //----- general
 
   // Get the number of elements.
-  int getLength() { return length; }
+  int getLength() const { return length; }
 
   // Returns a (shallow) copy of this list.
-  GooList *copy();
+  GooList *copy() const;
 
   //----- ordered list support
 
   // Return the <i>th element.
   // Assumes 0 <= i < length.
-  void *get(int i) { return data[i]; }
+  void *get(int i) const { return data[i]; }
 
   // Replace the <i>th element.
   // Assumes 0 <= i < length.
diff --git a/poppler/FileSpec.cc b/poppler/FileSpec.cc
index a5cb947a..2628c363 100644
--- a/poppler/FileSpec.cc
+++ b/poppler/FileSpec.cc
@@ -7,7 +7,7 @@
 //
 // Copyright (C) 2008-2009 Carlos Garcia Campos <carlo...@gnome.org>
 // Copyright (C) 2009 Kovid Goyal <ko...@kovidgoyal.net>
-// Copyright (C) 2012, 2017 Albert Astals Cid <aa...@kde.org>
+// Copyright (C) 2012, 2017, 2018 Albert Astals Cid <aa...@kde.org>
 // Copyright (C) 2012 Hib Eris <h...@hiberis.nl>
 // Copyright (C) 2018 Klarälvdalens Datakonsult AB, a KDAB Group company, 
<i...@kdab.com>. Work sponsored by the LiMux project of the city of Munich
 //
@@ -28,7 +28,7 @@
 
 #include "FileSpec.h"
 
-EmbFile::EmbFile(Object *efStream)
+EmbFile::EmbFile(const Object *efStream)
 {
   m_size = -1;
   m_createDate = nullptr;
@@ -100,7 +100,7 @@ GBool EmbFile::save2(FILE *f) {
   return gTrue;
 }
 
-FileSpec::FileSpec(Object *fileSpecA)
+FileSpec::FileSpec(const Object *fileSpecA)
 {
   ok = gTrue;
   fileName = nullptr;
@@ -172,7 +172,7 @@ GooString *FileSpec::getFileNameForPlatform()
   return platformFileName;
 }
 
-Object getFileSpecName (Object *fileSpec)
+Object getFileSpecName (const Object *fileSpec)
 {
   if (fileSpec->isString()) {
     return fileSpec->copy();
@@ -203,7 +203,7 @@ Object getFileSpecName (Object *fileSpec)
   return Object();
 }
 
-Object getFileSpecNameForPlatform (Object *fileSpec)
+Object getFileSpecNameForPlatform (const Object *fileSpec)
 {
   if (fileSpec->isString()) {
     return fileSpec->copy();
diff --git a/poppler/FileSpec.h b/poppler/FileSpec.h
index 28394650..f40f7705 100644
--- a/poppler/FileSpec.h
+++ b/poppler/FileSpec.h
@@ -24,20 +24,20 @@
 
 class EmbFile {
 public:
-  EmbFile(Object *efStream);
+  EmbFile(const Object *efStream);
   ~EmbFile();
 
   EmbFile(const EmbFile &) = delete;
   EmbFile& operator=(const EmbFile &) = delete;
 
-  int size() { return m_size; }
-  GooString *modDate() { return m_modDate; }
-  GooString *createDate() { return m_createDate; }
-  GooString *checksum() { return m_checksum; }
-  GooString *mimeType() { return m_mimetype; }
+  int size() const { return m_size; }
+  const GooString *modDate() const { return m_modDate; }
+  const GooString *createDate() const { return m_createDate; }
+  const GooString *checksum() const { return m_checksum; }
+  const GooString *mimeType() const { return m_mimetype; }
   Object *streamObject() { return &m_objStr; }
   Stream *stream() { return isOk() ? m_objStr.getStream() : NULL; }
-  GBool isOk() { return m_objStr.isStream(); }
+  GBool isOk() const { return m_objStr.isStream(); }
   GBool save(const char *path);
 
 private:
@@ -53,17 +53,17 @@ private:
 
 class FileSpec {
 public:
-  FileSpec(Object *fileSpec);
+  FileSpec(const Object *fileSpec);
   ~FileSpec();
 
   FileSpec(const FileSpec &) = delete;
   FileSpec& operator=(const FileSpec &) = delete;
 
-  GBool isOk() { return ok; }
+  GBool isOk() const { return ok; }
 
-  GooString *getFileName() const { return fileName; }
+  const GooString *getFileName() const { return fileName; }
   GooString *getFileNameForPlatform();
-  GooString *getDescription() const { return desc; }
+  const GooString *getDescription() const { return desc; }
   EmbFile *getEmbeddedFile();
 
 private:
@@ -78,7 +78,7 @@ private:
   GooString *desc;             // Desc
 };
 
-Object getFileSpecName (Object *fileSpec);
-Object getFileSpecNameForPlatform (Object *fileSpec);
+Object getFileSpecName (const Object *fileSpec);
+Object getFileSpecNameForPlatform (const Object *fileSpec);
 
 #endif /* FILE_SPEC_H */
diff --git a/poppler/Function.h b/poppler/Function.h
index 65b53251..10adf705 100644
--- a/poppler/Function.h
+++ b/poppler/Function.h
@@ -240,7 +240,7 @@ public:
   void transform(double *in, double *out) override;
   GBool isOk() override { return ok; }
 
-  GooString *getCodeString() { return codeString; }
+  const GooString *getCodeString() const { return codeString; }
 
 private:
 
diff --git a/poppler/Link.cc b/poppler/Link.cc
index 1abaea2f..9be6a8c1 100644
--- a/poppler/Link.cc
+++ b/poppler/Link.cc
@@ -16,7 +16,7 @@
 // Copyright (C) 2006, 2008 Pino Toscano <p...@kde.org>
 // Copyright (C) 2007, 2010, 2011 Carlos Garcia Campos <carlo...@gnome.org>
 // Copyright (C) 2008 Hugo Mercier <hmercie...@gmail.com>
-// Copyright (C) 2008-2010, 2012-2014, 2016, 2017 Albert Astals Cid 
<aa...@kde.org>
+// Copyright (C) 2008-2010, 2012-2014, 2016-2018 Albert Astals Cid 
<aa...@kde.org>
 // Copyright (C) 2009 Kovid Goyal <ko...@kovidgoyal.net>
 // Copyright (C) 2009 Ilya Gorenbein <igorenb...@finjan.com>
 // Copyright (C) 2012 Tobias Koening <tobias.koe...@kdab.com>
@@ -52,7 +52,7 @@
 // LinkAction
 //------------------------------------------------------------------------
 
-LinkAction *LinkAction::parseDest(Object *obj) {
+LinkAction *LinkAction::parseDest(const Object *obj) {
   LinkAction *action;
 
   action = new LinkGoTo(obj);
@@ -63,7 +63,7 @@ LinkAction *LinkAction::parseDest(Object *obj) {
   return action;
 }
 
-LinkAction *LinkAction::parseAction(Object *obj, GooString *baseURI) {
+LinkAction *LinkAction::parseAction(const Object *obj, const GooString 
*baseURI) {
   LinkAction *action;
 
   if (!obj->isDict()) {
@@ -142,7 +142,7 @@ LinkAction *LinkAction::parseAction(Object *obj, GooString 
*baseURI) {
 // LinkDest
 //------------------------------------------------------------------------
 
-LinkDest::LinkDest(Array *a) {
+LinkDest::LinkDest(const Array *a) {
   // initialize fields
   left = bottom = right = top = zoom = 0;
   changeLeft = changeTop = changeZoom = gFalse;
@@ -340,7 +340,7 @@ LinkDest::LinkDest(Array *a) {
   return;
 }
 
-LinkDest::LinkDest(LinkDest *dest) {
+LinkDest::LinkDest(const LinkDest *dest) {
   kind = dest->kind;
   pageIsRef = dest->pageIsRef;
   if (pageIsRef)
@@ -362,7 +362,7 @@ LinkDest::LinkDest(LinkDest *dest) {
 // LinkGoTo
 //------------------------------------------------------------------------
 
-LinkGoTo::LinkGoTo(Object *destObj) {
+LinkGoTo::LinkGoTo(const Object *destObj) {
   dest = nullptr;
   namedDest = nullptr;
 
@@ -442,7 +442,7 @@ LinkGoToR::~LinkGoToR() {
 // LinkLaunch
 //------------------------------------------------------------------------
 
-LinkLaunch::LinkLaunch(Object *actionObj) {
+LinkLaunch::LinkLaunch(const Object *actionObj) {
 
   fileName = nullptr;
   params = nullptr;
@@ -490,7 +490,7 @@ LinkLaunch::~LinkLaunch() {
 // LinkURI
 //------------------------------------------------------------------------
 
-LinkURI::LinkURI(Object *uriObj, GooString *baseURI) {
+LinkURI::LinkURI(const Object *uriObj, const GooString *baseURI) {
   const GooString *uri2;
   int n;
   char c;
@@ -539,7 +539,7 @@ LinkURI::~LinkURI() {
 // LinkNamed
 //------------------------------------------------------------------------
 
-LinkNamed::LinkNamed(Object *nameObj) {
+LinkNamed::LinkNamed(const Object *nameObj) {
   name = nullptr;
   if (nameObj->isName()) {
     name = new GooString(nameObj->getName());
@@ -556,7 +556,7 @@ LinkNamed::~LinkNamed() {
 // LinkMovie
 //------------------------------------------------------------------------
 
-LinkMovie::LinkMovie(Object *obj) {
+LinkMovie::LinkMovie(const Object *obj) {
   annotRef.num = -1;
   annotTitle = nullptr;
 
@@ -604,7 +604,7 @@ LinkMovie::~LinkMovie() {
 // LinkSound
 //------------------------------------------------------------------------
 
-LinkSound::LinkSound(Object *soundObj) {
+LinkSound::LinkSound(const Object *soundObj) {
   volume = 1.0;
   sync = gFalse;
   repeat = gFalse;
@@ -646,7 +646,7 @@ LinkSound::~LinkSound() {
 // LinkRendition
 //------------------------------------------------------------------------
 
-LinkRendition::LinkRendition(Object *obj) {
+LinkRendition::LinkRendition(const Object *obj) {
   operation = NoRendition;
   media = nullptr;
   js = nullptr;
@@ -743,7 +743,7 @@ LinkJavaScript::~LinkJavaScript() {
 //------------------------------------------------------------------------
 // LinkOCGState
 //------------------------------------------------------------------------
-LinkOCGState::LinkOCGState(Object *obj) {
+LinkOCGState::LinkOCGState(const Object *obj) {
   stateList = new GooList();
   preserveRB = gTrue;
 
diff --git a/poppler/Link.h b/poppler/Link.h
index d6d1f988..90496c42 100644
--- a/poppler/Link.h
+++ b/poppler/Link.h
@@ -72,16 +72,16 @@ public:
   virtual ~LinkAction() {}
 
   // Was the LinkAction created successfully?
-  virtual GBool isOk() = 0;
+  virtual GBool isOk() const = 0;
 
   // Check link action type.
-  virtual LinkActionKind getKind() = 0;
+  virtual LinkActionKind getKind() const = 0;
 
   // Parse a destination (old-style action) name, string, or array.
-  static LinkAction *parseDest(Object *obj);
+  static LinkAction *parseDest(const Object *obj);
 
   // Parse an action dictionary.
-  static LinkAction *parseAction(Object *obj, GooString *baseURI = NULL);
+  static LinkAction *parseAction(const Object *obj, const GooString *baseURI = 
NULL);
 };
 
 //------------------------------------------------------------------------
@@ -103,27 +103,27 @@ class LinkDest {
 public:
 
   // Build a LinkDest from the array.
-  LinkDest(Array *a);
+  LinkDest(const Array *a);
 
   // Copy a LinkDest.
-  LinkDest *copy() { return new LinkDest(this); }
+  LinkDest *copy() const { return new LinkDest(this); }
 
   // Was the LinkDest created successfully?
-  GBool isOk() { return ok; }
+  GBool isOk() const { return ok; }
 
   // Accessors.
-  LinkDestKind getKind() { return kind; }
-  GBool isPageRef() { return pageIsRef; }
-  int getPageNum() { return pageNum; }
-  Ref getPageRef() { return pageRef; }
-  double getLeft() { return left; }
-  double getBottom() { return bottom; }
-  double getRight() { return right; }
-  double getTop() { return top; }
-  double getZoom() { return zoom; }
-  GBool getChangeLeft() { return changeLeft; }
-  GBool getChangeTop() { return changeTop; }
-  GBool getChangeZoom() { return changeZoom; }
+  LinkDestKind getKind() const { return kind; }
+  GBool isPageRef() const { return pageIsRef; }
+  int getPageNum() const { return pageNum; }
+  Ref getPageRef() const { return pageRef; }
+  double getLeft() const { return left; }
+  double getBottom() const { return bottom; }
+  double getRight() const { return right; }
+  double getTop() const { return top; }
+  double getZoom() const { return zoom; }
+  GBool getChangeLeft() const { return changeLeft; }
+  GBool getChangeTop() const { return changeTop; }
+  GBool getChangeZoom() const { return changeZoom; }
 
 private:
 
@@ -142,7 +142,7 @@ private:
                                //   destFitV/BV use changeLeft
   GBool ok;                    // set if created successfully
 
-  LinkDest(LinkDest *dest);
+  LinkDest(const LinkDest *dest);
 };
 
 //------------------------------------------------------------------------
@@ -153,17 +153,17 @@ class LinkGoTo: public LinkAction {
 public:
 
   // Build a LinkGoTo from a destination (dictionary, name, or string).
-  LinkGoTo(Object *destObj);
+  LinkGoTo(const Object *destObj);
 
   // Destructor.
   ~LinkGoTo();
 
   // Was the LinkGoTo created successfully?
-  GBool isOk() override { return dest || namedDest; }
+  GBool isOk() const override { return dest || namedDest; }
 
   // Accessors.
-  LinkActionKind getKind() override { return actionGoTo; }
-  LinkDest *getDest() { return dest; }
+  LinkActionKind getKind() const override { return actionGoTo; }
+  const LinkDest *getDest() const { return dest; }
   const GooString *getNamedDest() const { return namedDest; }
 
 private:
@@ -189,12 +189,12 @@ public:
   ~LinkGoToR();
 
   // Was the LinkGoToR created successfully?
-  GBool isOk() override { return fileName && (dest || namedDest); }
+  GBool isOk() const override { return fileName && (dest || namedDest); }
 
   // Accessors.
-  LinkActionKind getKind() override { return actionGoToR; }
+  LinkActionKind getKind() const override { return actionGoToR; }
   const GooString *getFileName() const { return fileName; }
-  LinkDest *getDest() { return dest; }
+  const LinkDest *getDest() const { return dest; }
   const GooString *getNamedDest() const { return namedDest; }
 
 private:
@@ -214,16 +214,16 @@ class LinkLaunch: public LinkAction {
 public:
 
   // Build a LinkLaunch from an action dictionary.
-  LinkLaunch(Object *actionObj);
+  LinkLaunch(const Object *actionObj);
 
   // Destructor.
   ~LinkLaunch();
 
   // Was the LinkLaunch created successfully?
-  GBool isOk() override { return fileName != NULL; }
+  GBool isOk() const override { return fileName != NULL; }
 
   // Accessors.
-  LinkActionKind getKind() override { return actionLaunch; }
+  LinkActionKind getKind() const override { return actionLaunch; }
   const GooString *getFileName() const { return fileName; }
   const GooString *getParams() const { return params; }
 
@@ -241,16 +241,16 @@ class LinkURI: public LinkAction {
 public:
 
   // Build a LinkURI given the URI (string) and base URI.
-  LinkURI(Object *uriObj, GooString *baseURI);
+  LinkURI(const Object *uriObj, const GooString *baseURI);
 
   // Destructor.
   ~LinkURI();
 
   // Was the LinkURI created successfully?
-  GBool isOk() override { return uri != NULL; }
+  GBool isOk() const override { return uri != NULL; }
 
   // Accessors.
-  LinkActionKind getKind() override { return actionURI; }
+  LinkActionKind getKind() const override { return actionURI; }
   const GooString *getURI() const { return uri; }
 
 private:
@@ -266,13 +266,13 @@ class LinkNamed: public LinkAction {
 public:
 
   // Build a LinkNamed given the action name.
-  LinkNamed(Object *nameObj);
+  LinkNamed(const Object *nameObj);
 
   ~LinkNamed();
 
-  GBool isOk() override { return name != NULL; }
+  GBool isOk() const override { return name != NULL; }
 
-  LinkActionKind getKind() override { return actionNamed; }
+  LinkActionKind getKind() const override { return actionNamed; }
   const GooString *getName() const { return name; }
 
 private:
@@ -295,21 +295,21 @@ public:
     operationTypeStop
   };
 
-  LinkMovie(Object *obj);
+  LinkMovie(const Object *obj);
   ~LinkMovie();
 
-  GBool isOk() override { return annotRef.num >= 0 || annotTitle != NULL; }
-  LinkActionKind getKind() override { return actionMovie; }
+  GBool isOk() const override { return annotRef.num >= 0 || annotTitle != 
NULL; }
+  LinkActionKind getKind() const override { return actionMovie; }
 
   // a movie action stores either an indirect reference to a movie annotation
   // or the movie annotation title
 
-  GBool hasAnnotRef() { return annotRef.num >= 0; }
-  GBool hasAnnotTitle() { return annotTitle != NULL; }
-  Ref *getAnnotRef() { return &annotRef; }
+  GBool hasAnnotRef() const { return annotRef.num >= 0; }
+  GBool hasAnnotTitle() const { return annotTitle != NULL; }
+  const Ref *getAnnotRef() const { return &annotRef; }
   const GooString *getAnnotTitle() const { return annotTitle; }
 
-  OperationType getOperation() { return operation; }
+  OperationType getOperation() const { return operation; }
 
 private:
 
@@ -337,23 +337,23 @@ public:
     ResumeRendition
   };
 
-  LinkRendition(Object *Obj);
+  LinkRendition(const Object *Obj);
 
   ~LinkRendition();
 
-  GBool isOk() override { return true; }
+  GBool isOk() const override { return true; }
 
-  LinkActionKind getKind() override { return actionRendition; }
+  LinkActionKind getKind() const override { return actionRendition; }
 
-  GBool hasRenditionObject() { return renditionObj.isDict(); }
-  Object* getRenditionObject() { return &renditionObj; }
+  GBool hasRenditionObject() const { return renditionObj.isDict(); }
+  const Object* getRenditionObject() const { return &renditionObj; }
 
-  GBool hasScreenAnnot() { return screenRef.isRef(); }
-  Ref getScreenAnnot() { return screenRef.getRef(); }
+  GBool hasScreenAnnot() const { return screenRef.isRef(); }
+  Ref getScreenAnnot() const { return screenRef.getRef(); }
 
-  RenditionOperation getOperation() { return operation; }
+  RenditionOperation getOperation() const { return operation; }
 
-  MediaRendition* getMedia() { return media; }
+  const MediaRendition* getMedia() const { return media; }
 
   const GooString *getScript() const { return js; }
 
@@ -375,19 +375,19 @@ private:
 class LinkSound: public LinkAction {
 public:
 
-  LinkSound(Object *soundObj);
+  LinkSound(const Object *soundObj);
 
   ~LinkSound();
 
-  GBool isOk() override { return sound != NULL; }
+  GBool isOk() const override { return sound != NULL; }
 
-  LinkActionKind getKind() override { return actionSound; }
+  LinkActionKind getKind() const override { return actionSound; }
 
-  double getVolume() { return volume; }
-  GBool getSynchronous() { return sync; }
-  GBool getRepeat() { return repeat; }
-  GBool getMix() { return mix; }
-  Sound *getSound() { return sound; }
+  double getVolume() const { return volume; }
+  GBool getSynchronous() const { return sync; }
+  GBool getRepeat() const { return repeat; }
+  GBool getMix() const { return mix; }
+  Sound *getSound() const { return sound; }
 
 private:
 
@@ -410,9 +410,9 @@ public:
 
   ~LinkJavaScript();
 
-  GBool isOk() override { return js != NULL; }
+  GBool isOk() const override { return js != NULL; }
 
-  LinkActionKind getKind() override { return actionJavaScript; }
+  LinkActionKind getKind() const override { return actionJavaScript; }
   const GooString *getScript() const { return js; }
 
 private:
@@ -425,13 +425,13 @@ private:
 //------------------------------------------------------------------------
 class LinkOCGState: public LinkAction {
 public:
-  LinkOCGState(Object *obj);
+  LinkOCGState(const Object *obj);
 
   ~LinkOCGState();
 
-  GBool isOk() override { return stateList != NULL; }
+  GBool isOk() const override { return stateList != NULL; }
 
-  LinkActionKind getKind() override { return actionOCGState; }
+  LinkActionKind getKind() const override { return actionOCGState; }
 
   enum State { On, Off, Toggle};
   struct StateList {
@@ -443,8 +443,8 @@ public:
     GooList *list;
   };
 
-  GooList *getStateList() { return stateList; }
-  GBool getPreserveRB() { return preserveRB; }
+  const GooList *getStateList() const { return stateList; }
+  GBool getPreserveRB() const { return preserveRB; }
 
 private:
   GooList *stateList;
@@ -465,10 +465,10 @@ public:
   ~LinkUnknown();
 
   // Was the LinkUnknown create successfully?
-  GBool isOk() override { return action != NULL; }
+  GBool isOk() const override { return action != NULL; }
 
   // Accessors.
-  LinkActionKind getKind() override { return actionUnknown; }
+  LinkActionKind getKind() const override { return actionUnknown; }
   const GooString *getAction() const { return action; }
 
 private:
diff --git a/poppler/Movie.cc b/poppler/Movie.cc
index 3cc922ff..2fe05da3 100644
--- a/poppler/Movie.cc
+++ b/poppler/Movie.cc
@@ -6,7 +6,7 @@
 // Hugo Mercier <hmercier31[at]gmail.com> (c) 2008
 // Pino Toscano <p...@kde.org> (c) 2008
 // Carlos Garcia Campos <carlo...@gnome.org> (c) 2010
-// Albert Astals Cid <aa...@kde.org> (c) 2010, 2017
+// Albert Astals Cid <aa...@kde.org> (c) 2010, 2017, 2018
 //
 // This program is free software; you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -46,7 +46,7 @@ MovieActivationParameters::MovieActivationParameters() {
 MovieActivationParameters::~MovieActivationParameters() {
 }
 
-void MovieActivationParameters::parseMovieActivation(Object* aDict) {
+void MovieActivationParameters::parseMovieActivation(const Object* aDict) {
   Object obj1 = aDict->dictLookup("Start");
   if (obj1.isNull()) {
     if (obj1.isInt()) {
@@ -172,7 +172,7 @@ void 
MovieActivationParameters::parseMovieActivation(Object* aDict) {
   }
 }
 
-void Movie::parseMovie (Object *movieDict) {
+void Movie::parseMovie (const Object *movieDict) {
   fileName = nullptr;
   rotationAngle = 0;
   width = -1;
@@ -230,7 +230,7 @@ Movie::~Movie() {
   delete fileName;
 }
 
-Movie::Movie(Object *movieDict) {
+Movie::Movie(const Object *movieDict) {
   ok = gTrue;
 
   if (movieDict->isDict())
@@ -239,7 +239,7 @@ Movie::Movie(Object *movieDict) {
     ok = gFalse;
 }
 
-Movie::Movie(Object *movieDict, Object *aDict) {
+Movie::Movie(const Object *movieDict, const Object *aDict) {
   ok = gTrue;
 
   if (movieDict->isDict()) {
@@ -274,6 +274,6 @@ void Movie::getFloatingWindowSize(int *widthA, int *heightA)
   *heightA = int(height * double(MA.znum) / MA.zdenum);
 }
 
-Movie* Movie::copy() {
+Movie* Movie::copy() const {
   return new Movie(*this);
 }
diff --git a/poppler/Movie.h b/poppler/Movie.h
index 65379167..5c7f7913 100644
--- a/poppler/Movie.h
+++ b/poppler/Movie.h
@@ -33,7 +33,7 @@ struct MovieActivationParameters {
   ~MovieActivationParameters();
 
   // parse from a "Movie Activation" dictionary
-  void parseMovieActivation(Object* actObj);
+  void parseMovieActivation(const Object* actObj);
 
   enum MovieRepeatMode {
     repeatModeOnce,
@@ -70,30 +70,30 @@ struct MovieActivationParameters {
 
 class Movie {
  public:
-  Movie(Object *objMovie, Object *objAct);
-  Movie(Object *objMovie);
+  Movie(const Object *objMovie, const Object *objAct);
+  Movie(const Object *objMovie);
   Movie(const Movie &movie);
   ~Movie();
   Movie& operator=(const Movie &) = delete;
 
-  GBool isOk() { return ok; }
-  MovieActivationParameters* getActivationParameters() { return &MA; }
+  GBool isOk() const { return ok; }
+  const MovieActivationParameters* getActivationParameters() const { return 
&MA; }
 
-  GooString* getFileName() { return fileName; }
+  const GooString* getFileName() const { return fileName; }
 
-  Gushort getRotationAngle() { return rotationAngle; }
-  void getAspect (int *widthA, int *heightA) { *widthA = width; *heightA = 
height; }
+  Gushort getRotationAngle() const { return rotationAngle; }
+  void getAspect (int *widthA, int *heightA) const { *widthA = width; *heightA 
= height; }
 
-  Object getPoster() { return poster.copy(); }
-  GBool getShowPoster() { return showPoster; }
+  Object getPoster() const { return poster.copy(); }
+  GBool getShowPoster() const { return showPoster; }
 
-  GBool getUseFloatingWindow() { return MA.floatingWindow; }
+  GBool getUseFloatingWindow() const { return MA.floatingWindow; }
   void  getFloatingWindowSize(int *width, int *height);
 
-  Movie* copy();
+  Movie* copy() const ;
 
  private:
-  void parseMovie (Object *movieDict);
+  void parseMovie (const Object *movieDict);
 
   GBool ok;
 
diff --git a/poppler/OptionalContent.cc b/poppler/OptionalContent.cc
index 8bd6baa4..8376a0e4 100644
--- a/poppler/OptionalContent.cc
+++ b/poppler/OptionalContent.cc
@@ -133,7 +133,7 @@ OCGs::~OCGs()
 }
 
 
-bool OCGs::hasOCGs()
+bool OCGs::hasOCGs() const
 {
   return ( optionalContentGroups->getLength() > 0 );
 }
@@ -374,7 +374,7 @@ OptionalContentGroup::OptionalContentGroup(GooString *label)
   m_state = On;
 }
 
-GooString* OptionalContentGroup::getName() const
+const GooString* OptionalContentGroup::getName() const
 {
   return m_name;
 }
@@ -489,13 +489,13 @@ OCDisplayNode::~OCDisplayNode() {
   }
 }
 
-int OCDisplayNode::getNumChildren() {
+int OCDisplayNode::getNumChildren() const {
   if (!children) {
     return 0;
   }
   return children->getLength();
 }
 
-OCDisplayNode *OCDisplayNode::getChild(int idx) {
+OCDisplayNode *OCDisplayNode::getChild(int idx) const {
   return (OCDisplayNode *)children->get(idx);
 }
diff --git a/poppler/OptionalContent.h b/poppler/OptionalContent.h
index a67171df..ea5618e4 100644
--- a/poppler/OptionalContent.h
+++ b/poppler/OptionalContent.h
@@ -39,9 +39,9 @@ public:
   OCGs& operator=(const OCGs &) = delete;
 
   // Is OCGS valid?
-  GBool isOk() { return ok; }
+  GBool isOk() const { return ok; }
   
-  bool hasOCGs();
+  bool hasOCGs() const;
   GooList *getOCGs() const { return optionalContentGroups; }
 
   OptionalContentGroup* findOcgByRef( const Ref &ref);
@@ -96,7 +96,7 @@ public:
   OptionalContentGroup(const OptionalContentGroup &) = delete;
   OptionalContentGroup& operator=(const OptionalContentGroup &) = delete;
 
-  GooString* getName() const;
+  const GooString* getName() const;
 
   Ref getRef() const;
   void setRef(const Ref ref);
@@ -127,10 +127,10 @@ public:
   OCDisplayNode(const OCDisplayNode &) = delete;
   OCDisplayNode& operator=(const OCDisplayNode &) = delete;
 
-  GooString *getName() { return name; }
-  OptionalContentGroup *getOCG() { return ocg; }
-  int getNumChildren();
-  OCDisplayNode *getChild(int idx);
+  const GooString *getName() const { return name; }
+  const OptionalContentGroup *getOCG() const { return ocg; }
+  int getNumChildren() const;
+  OCDisplayNode *getChild(int idx) const;
 
 private:
 
diff --git a/poppler/Outline.cc b/poppler/Outline.cc
index f12d9022..c6b12dc0 100644
--- a/poppler/Outline.cc
+++ b/poppler/Outline.cc
@@ -14,7 +14,7 @@
 // under GPL version 2 or later
 //
 // Copyright (C) 2005 Marco Pesenti Gritti <m...@redhat.com>
-// Copyright (C) 2008, 2016, 2017 Albert Astals Cid <aa...@kde.org>
+// Copyright (C) 2008, 2016-2018 Albert Astals Cid <aa...@kde.org>
 // Copyright (C) 2009 Nick Jones <nick.jo...@network-box.com>
 // Copyright (C) 2016 Jason Crain <ja...@aquaticape.us>
 // Copyright (C) 2017 Adrian Johnson <ajohn...@redneon.com>
@@ -42,7 +42,7 @@
 
 //------------------------------------------------------------------------
 
-Outline::Outline(Object *outlineObj, XRef *xref) {
+Outline::Outline(const Object *outlineObj, XRef *xref) {
   items = nullptr;
   if (!outlineObj->isDict()) {
     return;
@@ -59,7 +59,7 @@ Outline::~Outline() {
 
 //------------------------------------------------------------------------
 
-OutlineItem::OutlineItem(Dict *dict, int refNumA, OutlineItem *parentA, XRef 
*xrefA) {
+OutlineItem::OutlineItem(const Dict *dict, int refNumA, OutlineItem *parentA, 
XRef *xrefA) {
   Object obj1;
 
   refNum = refNumA;
@@ -111,7 +111,7 @@ OutlineItem::~OutlineItem() {
   }
 }
 
-GooList *OutlineItem::readItemList(OutlineItem *parent, Object *firstItemRef, 
XRef *xrefA) {
+GooList *OutlineItem::readItemList(OutlineItem *parent, const Object 
*firstItemRef, XRef *xrefA) {
   GooList *items = new GooList();
 
   char* alreadyRead = (char *)gmalloc(xrefA->getNumObjects());
@@ -123,7 +123,7 @@ GooList *OutlineItem::readItemList(OutlineItem *parent, 
Object *firstItemRef, XR
     parentO = parentO->parent;
   }
 
-  Object *p = firstItemRef;
+  const Object *p = firstItemRef;
   while (p->isRef() && 
         (p->getRefNum() >= 0) && 
          (p->getRefNum() < xrefA->getNumObjects()) &&
diff --git a/poppler/Outline.h b/poppler/Outline.h
index 1584ddcb..a6e9e79a 100644
--- a/poppler/Outline.h
+++ b/poppler/Outline.h
@@ -41,13 +41,13 @@ class LinkAction;
 class Outline {
 public:
 
-  Outline(Object *outlineObj, XRef *xref);
+  Outline(const Object *outlineObj, XRef *xref);
   ~Outline();
 
   Outline(const Outline &) = delete;
   Outline& operator=(const Outline &) = delete;
 
-  GooList *getItems() { return items; }
+  const GooList *getItems() const { return items; }
 
 private:
 
@@ -60,23 +60,23 @@ private:
 class OutlineItem {
 public:
 
-  OutlineItem(Dict *dict, int refNumA, OutlineItem *parentA, XRef *xrefA);
+  OutlineItem(const Dict *dict, int refNumA, OutlineItem *parentA, XRef 
*xrefA);
   ~OutlineItem();
 
   OutlineItem(const OutlineItem &) = delete;
   OutlineItem& operator=(const OutlineItem &) = delete;
 
-  static GooList *readItemList(OutlineItem *parent, Object *firstItemRef, XRef 
*xrefA);
+  static GooList *readItemList(OutlineItem *parent, const Object 
*firstItemRef, XRef *xrefA);
 
   void open();
   void close();
 
-  Unicode *getTitle() { return title; }
-  int getTitleLength() { return titleLen; }
-  LinkAction *getAction() { return action; }
-  GBool isOpen() { return startsOpen; }
-  GBool hasKids() { return firstRef.isRef(); }
-  GooList *getKids() { return kids; }
+  const Unicode *getTitle() const { return title; }
+  int getTitleLength() const { return titleLen; }
+  const LinkAction *getAction() const { return action; }
+  GBool isOpen() const { return startsOpen; }
+  GBool hasKids() const { return firstRef.isRef(); }
+  const GooList *getKids() const { return kids; }
 
 private:
 
diff --git a/poppler/Rendition.cc b/poppler/Rendition.cc
index f090a99a..8d30fb06 100644
--- a/poppler/Rendition.cc
+++ b/poppler/Rendition.cc
@@ -7,7 +7,7 @@
 // Pino Toscano <p...@kde.org> (c) 2008
 // Carlos Garcia Campos <carlo...@gnome.org> (c) 2010
 // Tobias Koenig <tobias.koe...@kdab.com> (c) 2012
-// Albert Astals Cid <aa...@kde.org> (C) 2017
+// Albert Astals Cid <aa...@kde.org> (C) 2017, 2018
 //
 // This program is free software; you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -371,7 +371,7 @@ void MediaRendition::outputToFile(FILE* fp) {
   
 }
 
-MediaRendition* MediaRendition::copy()
+MediaRendition* MediaRendition::copy() const
 {
   return new MediaRendition(*this);
 }
diff --git a/poppler/Rendition.h b/poppler/Rendition.h
index d84505ff..cfe57170 100644
--- a/poppler/Rendition.h
+++ b/poppler/Rendition.h
@@ -123,21 +123,21 @@ class MediaRendition {
   ~MediaRendition();
   MediaRendition& operator=(const MediaRendition &) = delete;
 
-  GBool isOk () { return ok; }
+  GBool isOk () const { return ok; }
 
-  MediaParameters* getMHParameters() { return &MH; }
-  MediaParameters* getBEParameters() { return &BE; }
+  const MediaParameters* getMHParameters() const { return &MH; }
+  const MediaParameters* getBEParameters() const { return &BE; }
 
-  GooString* getContentType() { return contentType; }
-  GooString* getFileName() { return fileName; }
+  const GooString* getContentType() const { return contentType; }
+  const GooString* getFileName() const { return fileName; }
 
-  GBool getIsEmbedded() { return isEmbedded; }
-  Stream* getEmbbededStream() { return isEmbedded ? 
embeddedStreamObject.getStream() : nullptr; }
-  Object* getEmbbededStreamObject() { return isEmbedded ? 
&embeddedStreamObject : nullptr; }
+  GBool getIsEmbedded() const { return isEmbedded; }
+  Stream* getEmbbededStream() const { return isEmbedded ? 
embeddedStreamObject.getStream() : nullptr; }
+  const Object* getEmbbededStreamObject() const { return isEmbedded ? 
&embeddedStreamObject : nullptr; }
   // write embedded stream to file
   void outputToFile(FILE*);
 
-  MediaRendition* copy();
+  MediaRendition* copy() const;
 
  private:
   GBool ok;
diff --git a/poppler/Sound.cc b/poppler/Sound.cc
index 4a59d3fe..aa2ac8f2 100644
--- a/poppler/Sound.cc
+++ b/poppler/Sound.cc
@@ -1,6 +1,6 @@
 /* Sound.cc - an object that holds the sound structure
  * Copyright (C) 2006-2007, Pino Toscano <p...@kde.org>
- * Copyright (C) 2009, 2017, Albert Astals Cid <aa...@kde.org>
+ * Copyright (C) 2009, 2017, 2018, Albert Astals Cid <aa...@kde.org>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -47,7 +47,7 @@ Sound *Sound::parseSound(Object *obj)
   }
 }
 
-Sound::Sound(Object *obj, bool readAttrs)
+Sound::Sound(const Object *obj, bool readAttrs)
 {
   streamObj = obj->copy();
 
@@ -116,7 +116,7 @@ Stream *Sound::getStream()
   return streamObj.getStream();
 }
 
-Sound *Sound::copy()
+Sound *Sound::copy() const
 {
   Sound *newsound = new Sound(&streamObj, false);
 
diff --git a/poppler/Sound.h b/poppler/Sound.h
index e88de4d6..ae8d0cee 100644
--- a/poppler/Sound.h
+++ b/poppler/Sound.h
@@ -50,21 +50,21 @@ public:
   Sound(const Sound &) = delete;
   Sound& operator=(const Sound &) = delete;
 
-  Object *getObject() { return &streamObj; }
+  const Object *getObject() const { return &streamObj; }
   Stream *getStream();
 
-  SoundKind getSoundKind() { return kind; }
-  GooString *getFileName() { return fileName; }
-  double getSamplingRate() { return samplingRate; }
-  int getChannels() { return channels; }
-  int getBitsPerSample() { return bitsPerSample; }
-  SoundEncoding getEncoding() { return encoding; }
+  SoundKind getSoundKind() const { return kind; }
+  const GooString *getFileName() const { return fileName; }
+  double getSamplingRate() const { return samplingRate; }
+  int getChannels() const { return channels; }
+  int getBitsPerSample() const { return bitsPerSample; }
+  SoundEncoding getEncoding() const { return encoding; }
 
-  Sound *copy();
+  Sound *copy() const;
 
 private:
   // Create a sound. The Object obj is ensured to be a Stream with a Dict
-  Sound(Object *obj, bool readAttrs = true);
+  Sound(const Object *obj, bool readAttrs = true);
 
   Object streamObj;
   SoundKind kind;
diff --git a/qt5/src/poppler-document.cc b/qt5/src/poppler-document.cc
index 2d971358..102bd820 100644
--- a/qt5/src/poppler-document.cc
+++ b/qt5/src/poppler-document.cc
@@ -1,7 +1,7 @@
 /* poppler-document.cc: qt interface to poppler
  * Copyright (C) 2005, Net Integration Technologies, Inc.
  * Copyright (C) 2005, 2008, Brad Hards <br...@frogmouth.net>
- * Copyright (C) 2005-2010, 2012, 2013, 2015, 2017, Albert Astals Cid 
<aa...@kde.org>
+ * Copyright (C) 2005-2010, 2012, 2013, 2015, 2017, 2018, Albert Astals Cid 
<aa...@kde.org>
  * Copyright (C) 2006-2010, Pino Toscano <p...@kde.org>
  * Copyright (C) 2010, 2011 Hib Eris <h...@hiberis.nl>
  * Copyright (C) 2012 Koji Otani <s...@bbr.jp>
@@ -584,7 +584,7 @@ namespace Poppler {
         if ( !outline )
             return nullptr;
 
-        GooList * items = outline->getItems();
+        const GooList * items = outline->getItems();
         if ( !items || items->getLength() < 1 )
             return nullptr;
 
diff --git a/qt5/src/poppler-embeddedfile.cc b/qt5/src/poppler-embeddedfile.cc
index 02058b75..620b1b1b 100644
--- a/qt5/src/poppler-embeddedfile.cc
+++ b/qt5/src/poppler-embeddedfile.cc
@@ -1,5 +1,5 @@
 /* poppler-document.cc: qt interface to poppler
- * Copyright (C) 2005, 2008, 2009, 2012, 2013, Albert Astals Cid 
<aa...@kde.org>
+ * Copyright (C) 2005, 2008, 2009, 2012, 2013, 2018, Albert Astals Cid 
<aa...@kde.org>
  * Copyright (C) 2005, Brad Hards <br...@frogmouth.net>
  * Copyright (C) 2008, 2011, Pino Toscano <p...@kde.org>
  * Copyright (C) 2018 Klarälvdalens Datakonsult AB, a KDAB Group company, 
<i...@kdab.com>. Work sponsored by the LiMux project of the city of Munich
@@ -69,13 +69,13 @@ EmbeddedFile::~EmbeddedFile()
 
 QString EmbeddedFile::name() const
 {
-       GooString *goo = m_embeddedFile->filespec->getFileName();
+       const GooString *goo = m_embeddedFile->filespec->getFileName();
        return goo ? UnicodeParsedString(goo) : QString();
 }
 
 QString EmbeddedFile::description() const
 {
-       GooString *goo = m_embeddedFile->filespec->getDescription();
+       const GooString *goo = m_embeddedFile->filespec->getDescription();
        return goo ? UnicodeParsedString(goo) : QString();
 }
 
@@ -98,13 +98,13 @@ QDateTime EmbeddedFile::createDate() const
 
 QByteArray EmbeddedFile::checksum() const
 {
-       GooString *goo = m_embeddedFile->embFile() ? 
m_embeddedFile->embFile()->checksum() : nullptr;
+       const GooString *goo = m_embeddedFile->embFile() ? 
m_embeddedFile->embFile()->checksum() : nullptr;
        return goo ? QByteArray::fromRawData(goo->getCString(), 
goo->getLength()) : QByteArray();
 }
 
 QString EmbeddedFile::mimeType() const
 {
-       GooString *goo = m_embeddedFile->embFile() ? 
m_embeddedFile->embFile()->mimeType() : nullptr;
+       const GooString *goo = m_embeddedFile->embFile() ? 
m_embeddedFile->embFile()->mimeType() : nullptr;
        return goo ? QString(goo->getCString()) : QString();
 }
 
diff --git a/qt5/src/poppler-link.cc b/qt5/src/poppler-link.cc
index 626040fb..ffa3e74d 100644
--- a/qt5/src/poppler-link.cc
+++ b/qt5/src/poppler-link.cc
@@ -1,5 +1,5 @@
 /* poppler-link.cc: qt interface to poppler
- * Copyright (C) 2006-2007, 2013, 2016, 2017, Albert Astals Cid
+ * Copyright (C) 2006-2007, 2013, 2016-2018, Albert Astals Cid
  * Copyright (C) 2007-2008, Pino Toscano <p...@kde.org>
  * Copyright (C) 2010 Hib Eris <h...@hiberis.nl>
  * Copyright (C) 2012, Tobias Koenig <to...@kdab.com>
@@ -232,7 +232,7 @@ class LinkMoviePrivate : public LinkPrivate
                : d( new LinkDestinationPrivate )
        {
                bool deleteDest = false;
-               LinkDest *ld = data.ld;
+               const LinkDest *ld = data.ld;
                
                if ( data.namedDest && !ld && !data.externalDest )
                {
diff --git a/qt5/src/poppler-media.cc b/qt5/src/poppler-media.cc
index 8059153d..53765764 100644
--- a/qt5/src/poppler-media.cc
+++ b/qt5/src/poppler-media.cc
@@ -154,7 +154,7 @@ QSize
 MediaRendition::size() const
 {
   Q_D( const MediaRendition );
-  MediaParameters *mp = nullptr;
+  const MediaParameters *mp = nullptr;
 
   if (d->rendition->getBEParameters())
     mp = d->rendition->getBEParameters();
diff --git a/qt5/src/poppler-movie.cc b/qt5/src/poppler-movie.cc
index cfa2182d..e37a5d6b 100644
--- a/qt5/src/poppler-movie.cc
+++ b/qt5/src/poppler-movie.cc
@@ -60,7 +60,7 @@ MovieObject::MovieObject( AnnotMovie *ann )
        m_movieData->m_movieObj = ann->getMovie()->copy();
        //TODO: copy poster image
 
-       MovieActivationParameters *mp = 
m_movieData->m_movieObj->getActivationParameters();
+       const MovieActivationParameters *mp = 
m_movieData->m_movieObj->getActivationParameters();
        int width, height;
        m_movieData->m_movieObj->getFloatingWindowSize(&width, &height);
        m_movieData->m_size = QSize(width, height);
@@ -76,7 +76,7 @@ MovieObject::~MovieObject()
 
 QString MovieObject::url() const
 {
-       GooString * goo = m_movieData->m_movieObj->getFileName();
+       const GooString * goo = m_movieData->m_movieObj->getFileName();
        return goo ? QString( goo->getCString() ) : QString();
 }
 
diff --git a/qt5/src/poppler-optcontent.cc b/qt5/src/poppler-optcontent.cc
index 36b7d6da..18997b6e 100644
--- a/qt5/src/poppler-optcontent.cc
+++ b/qt5/src/poppler-optcontent.cc
@@ -3,7 +3,7 @@
  * Copyright (C) 2007, Brad Hards <br...@kde.org>
  * Copyright (C) 2008, 2014, Pino Toscano <p...@kde.org>
  * Copyright (C) 2008, Carlos Garcia Campos <carlo...@gnome.org>
- * Copyright (C) 2015-2017, Albert Astals Cid <aa...@kde.org>
+ * Copyright (C) 2015-2018, Albert Astals Cid <aa...@kde.org>
  * Copyright (C) 2017, Hubert Figuière <h...@figuiere.net>
  * Copyright (C) 2018 Klarälvdalens Datakonsult AB, a KDAB Group company, 
<i...@kdab.com>. Work sponsored by the LiMux project of the city of Munich
  *
@@ -398,7 +398,7 @@ namespace Poppler
 
     QSet<OptContentItem *> changedItems;
 
-    GooList *statesList = popplerLinkOCGState->getStateList();
+    const GooList *statesList = popplerLinkOCGState->getStateList();
     for (int i = 0; i < statesList->getLength(); ++i) {
         ::LinkOCGState::StateList *stateList = 
(::LinkOCGState::StateList*)statesList->get(i);
 
diff --git a/qt5/src/poppler-private.cc b/qt5/src/poppler-private.cc
index 308343fe..78751f8e 100644
--- a/qt5/src/poppler-private.cc
+++ b/qt5/src/poppler-private.cc
@@ -1,6 +1,6 @@
 /* poppler-private.cc: qt interface to poppler
  * Copyright (C) 2005, Net Integration Technologies, Inc.
- * Copyright (C) 2006, 2011, 2015, 2017 by Albert Astals Cid <aa...@kde.org>
+ * Copyright (C) 2006, 2011, 2015, 2017, 2018 by Albert Astals Cid 
<aa...@kde.org>
  * Copyright (C) 2008, 2010, 2011, 2014 by Pino Toscano <p...@kde.org>
  * Copyright (C) 2013 by Thomas Freitag <thomas.frei...@alfa.de>
  * Copyright (C) 2013 Adrian Johnson <ajohn...@redneon.com>
@@ -74,7 +74,7 @@ namespace Debug {
         (*Debug::debugFunction)(emsg, Debug::debugClosure);
     }
 
-    QString unicodeToQString(Unicode* u, int len) {
+    QString unicodeToQString(const Unicode* u, int len) {
         if (!utf8Map)
         {
                 GooString enc("UTF-8");
@@ -163,7 +163,7 @@ namespace Debug {
         return 
QStringToUnicodeGooString(dt.toUTC().toString("yyyyMMddhhmmss+00'00'"));
     }
 
-    static void linkActionToTocItem( ::LinkAction * a, DocumentData * doc, 
QDomElement * e )
+    static void linkActionToTocItem( const ::LinkAction * a, DocumentData * 
doc, QDomElement * e )
     {
         if ( !a || !e )
             return;
@@ -173,8 +173,8 @@ namespace Debug {
             case actionGoTo:
             {
                 // page number is contained/referenced in a LinkGoTo
-                LinkGoTo * g = static_cast< LinkGoTo * >( a );
-                LinkDest * destination = g->getDest();
+                const LinkGoTo * g = static_cast< const LinkGoTo * >( a );
+                const LinkDest * destination = g->getDest();
                 if ( !destination && g->getNamedDest() )
                 {
                     // no 'destination' but an internal 'named reference'. we 
could
@@ -197,8 +197,8 @@ namespace Debug {
             case actionGoToR:
             {
                 // page number is contained/referenced in a LinkGoToR
-                LinkGoToR * g = static_cast< LinkGoToR * >( a );
-                LinkDest * destination = g->getDest();
+                const LinkGoToR * g = static_cast< const LinkGoToR * >( a );
+                const LinkDest * destination = g->getDest();
                 if ( !destination && g->getNamedDest() )
                 {
                     // no 'destination' but an internal 'named reference'. we 
could
@@ -221,7 +221,7 @@ namespace Debug {
             }
             case actionURI:
             {
-                LinkURI * u = static_cast< LinkURI * >( a );
+                const LinkURI * u = static_cast< const LinkURI * >( a );
                 e->setAttribute( QStringLiteral("DestinationURI"), 
u->getURI()->getCString() );
             }
             default: ;
@@ -259,7 +259,7 @@ namespace Debug {
     }
 
 
-    void DocumentData::addTocChildren( QDomDocument * docSyn, QDomNode * 
parent, GooList * items )
+    void DocumentData::addTocChildren( QDomDocument * docSyn, QDomNode * 
parent, const GooList * items )
     {
         int numItems = items->getLength();
         for ( int i = 0; i < numItems; ++i )
@@ -269,7 +269,7 @@ namespace Debug {
 
             // 1. create element using outlineItem's title as tagName
             QString name;
-            Unicode * uniChar = outlineItem->getTitle();
+            const Unicode * uniChar = outlineItem->getTitle();
             int titleLength = outlineItem->getTitleLength();
             name = unicodeToQString(uniChar, titleLength);
             if ( name.isEmpty() )
@@ -279,14 +279,14 @@ namespace Debug {
             parent->appendChild( item );
 
             // 2. find the page the link refers to
-            ::LinkAction * a = outlineItem->getAction();
+            const ::LinkAction * a = outlineItem->getAction();
             linkActionToTocItem( a, this, &item );
 
             item.setAttribute( QStringLiteral("Open"), QVariant( 
(bool)outlineItem->isOpen() ).toString() );
 
             // 3. recursively descend over children
             outlineItem->open();
-            GooList * children = outlineItem->getKids();
+            const GooList * children = outlineItem->getKids();
             if ( children )
                 addTocChildren( docSyn, &item, children );
         }
diff --git a/qt5/src/poppler-private.h b/qt5/src/poppler-private.h
index d37393a2..52715179 100644
--- a/qt5/src/poppler-private.h
+++ b/qt5/src/poppler-private.h
@@ -58,7 +58,7 @@ class FormWidget;
 namespace Poppler {
 
     /* borrowed from kpdf */
-    QString unicodeToQString(Unicode* u, int len);
+    QString unicodeToQString(const Unicode* u, int len);
 
     QString UnicodeParsedString(const GooString *s1);
 
@@ -73,12 +73,12 @@ namespace Poppler {
     class LinkDestinationData
     {
         public:
-            LinkDestinationData( LinkDest *l, const GooString *nd, 
Poppler::DocumentData *pdfdoc, bool external )
+            LinkDestinationData( const LinkDest *l, const GooString *nd, 
Poppler::DocumentData *pdfdoc, bool external )
              : ld(l), namedDest(nd), doc(pdfdoc), externalDest(external)
             {
             }
 
-            LinkDest *ld;
+            const LinkDest *ld;
             const GooString *namedDest;
             Poppler::DocumentData *doc;
             bool externalDest;
@@ -119,7 +119,7 @@ namespace Poppler {
        DocumentData(const DocumentData &) = delete;
        DocumentData& operator=(const DocumentData &) = delete;
        
-       void addTocChildren( QDomDocument * docSyn, QDomNode * parent, GooList 
* items );
+       void addTocChildren( QDomDocument * docSyn, QDomNode * parent, const 
GooList * items );
        
        void setPaperColor(const QColor &color)
        {
diff --git a/qt5/src/poppler-sound.cc b/qt5/src/poppler-sound.cc
index 5e4a0e59..2abdab22 100644
--- a/qt5/src/poppler-sound.cc
+++ b/qt5/src/poppler-sound.cc
@@ -78,7 +78,7 @@ QString SoundObject::url() const
        if ( m_soundData->m_type != SoundObject::External )
                return QString();
 
-       GooString * goo = m_soundData->m_soundObj->getFileName();
+       const GooString * goo = m_soundData->m_soundObj->getFileName();
        return goo ? QString( goo->getCString() ) : QString();
 }
 
diff --git a/utils/HtmlFonts.cc b/utils/HtmlFonts.cc
index efb584b5..250909b3 100644
--- a/utils/HtmlFonts.cc
+++ b/utils/HtmlFonts.cc
@@ -17,7 +17,7 @@
 // All changes made under the Poppler project to this file are licensed
 // under GPL version 2 or later
 //
-// Copyright (C) 2007, 2010, 2012 Albert Astals Cid <aa...@kde.org>
+// Copyright (C) 2007, 2010, 2012, 2018 Albert Astals Cid <aa...@kde.org>
 // Copyright (C) 2008 Boris Toloknov <tl...@yandex.ru>
 // Copyright (C) 2008 Tomas Are Haavet <tomas...@gmail.com>
 // Copyright (C) 2010 OSSD CDAC Mumbai by Leena Chourey (lee...@cdacmumbai.in) 
and Onkar Potdar (on...@cdacmumbai.in)
@@ -242,7 +242,7 @@ GooString* HtmlFont::getDefaultFont(){
 }
 
 // this method if plain wrong todo
-GooString* HtmlFont::HtmlFilter(Unicode* u, int uLen) {
+GooString* HtmlFont::HtmlFilter(const Unicode* u, int uLen) {
   GooString *tmp = new GooString();
   UnicodeMap *uMap;
   char buf[8];
diff --git a/utils/HtmlFonts.h b/utils/HtmlFonts.h
index 83fea95a..ba4f42ae 100644
--- a/utils/HtmlFonts.h
+++ b/utils/HtmlFonts.h
@@ -91,7 +91,7 @@ public:
    GooString* getFontName();
    static GooString* getDefaultFont();
    static void setDefaultFont(GooString* defaultFont);
-   static GooString* HtmlFilter(Unicode* u, int uLen); //char* s);
+   static GooString* HtmlFilter(const Unicode* u, int uLen); //char* s);
    GBool isEqual(const HtmlFont& x) const;
    GBool isEqualIgnoreBold(const HtmlFont& x) const;
    static GooString* simple(HtmlFont *font, Unicode *content, int uLen);
diff --git a/utils/HtmlOutputDev.cc b/utils/HtmlOutputDev.cc
index f4d17c65..ace303b3 100644
--- a/utils/HtmlOutputDev.cc
+++ b/utils/HtmlOutputDev.cc
@@ -1706,7 +1706,7 @@ GBool HtmlOutputDev::dumpDocOutline(PDFDoc* doc)
        if (!outline)
                return gFalse;
 
-       GooList *outlines = outline->getItems();
+       const GooList *outlines = outline->getItems();
        if (!outlines)
                return gFalse;
   
@@ -1764,7 +1764,7 @@ GBool HtmlOutputDev::dumpDocOutline(PDFDoc* doc)
 #endif
 }
 
-GBool HtmlOutputDev::newHtmlOutlineLevel(FILE *output, GooList *outlines, int 
level)
+GBool HtmlOutputDev::newHtmlOutlineLevel(FILE *output, const GooList 
*outlines, int level)
 {
 #ifdef DISABLE_OUTLINE
        return gFalse;
@@ -1836,7 +1836,7 @@ GBool HtmlOutputDev::newHtmlOutlineLevel(FILE *output, 
GooList *outlines, int le
 #endif
 }
 
-void HtmlOutputDev::newXmlOutlineLevel(FILE *output, GooList *outlines)
+void HtmlOutputDev::newXmlOutlineLevel(FILE *output, const GooList *outlines)
 {
 #ifndef DISABLE_OUTLINE
     fputs("<outline>\n", output);
@@ -1873,15 +1873,15 @@ void HtmlOutputDev::newXmlOutlineLevel(FILE *output, 
GooList *outlines)
 #ifndef DISABLE_OUTLINE
 int HtmlOutputDev::getOutlinePageNum(OutlineItem *item)
 {
-    LinkAction *action   = item->getAction();
-    LinkGoTo   *link     = nullptr;
+    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<LinkGoTo*>(action);
+    link = dynamic_cast<const LinkGoTo*>(action);
 
     if (!link || !link->isOk())
         return pagenum;
diff --git a/utils/HtmlOutputDev.h b/utils/HtmlOutputDev.h
index b47e40f9..ec552012 100644
--- a/utils/HtmlOutputDev.h
+++ b/utils/HtmlOutputDev.h
@@ -331,8 +331,8 @@ private:
   GooString* getLinkDest(AnnotLink *link);
   void dumpMetaVars(FILE *);
   void doFrame(int firstPage);
-  GBool newHtmlOutlineLevel(FILE *output, GooList *outlines, int level = 1);
-  void newXmlOutlineLevel(FILE *output, GooList *outlines);
+  GBool newHtmlOutlineLevel(FILE *output, const GooList *outlines, int level = 
1);
+  void newXmlOutlineLevel(FILE *output, const GooList *outlines);
 #ifndef DISABLE_OUTLINE
   int getOutlinePageNum(OutlineItem *item);
 #endif
diff --git a/utils/pdfdetach.cc b/utils/pdfdetach.cc
index 25fcaae2..bd20df2e 100644
--- a/utils/pdfdetach.cc
+++ b/utils/pdfdetach.cc
@@ -97,7 +97,7 @@ int main(int argc, char *argv[]) {
   Page *page;
   Annots *annots;
   Annot *annot;
-  GooString *s1;
+  const GooString *s1;
   Unicode u;
   GBool isUnicode;
 
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