gnu: cgal: Update to 5.2 [security fixes].

* gnu/packages/patches/cgal-security-pr-5371.patch: New patch. Downloaded from
<https://patch-diff.githubusercontent.com/raw/CGAL/cgal/pull/5371.patch>, with
hunks on files matching pattern "*Convex_decomposition_3*" removed because
they don't exist in cgal's released sources.
* gnu/local.mk (dist_patch_DATA): Register it.
* gnu/packages/graphics.scm (cgal): Update to 5.2.
[source]: Apply patch.

1 files changed, 1611 insertions, 0 deletions

diff --git a/gnu/packages/patches/cgal-security-pr-5371.patch b/gnu/packages/patches/cgal-security-pr-5371.patch
new file mode 100644
index 0000000000..dea53dceaf
--- /dev/null
+++ b/gnu/packages/patches/cgal-security-pr-5371.patch
@@ -0,0 +1,1611 @@
+From 618b409b0fbcef7cb536a4134ae3a424ef5aae45 Mon Sep 17 00:00:00 2001
+From: Maxime Gimeno <maxime.gimeno@gmail.com>
+Date: Mon, 18 Jan 2021 15:40:40 +0100
+Subject: [PATCH 1/8] Fix Nef_2 and Nef_S2 IO
+
+---
+ Nef_2/include/CGAL/Nef_2/PM_io_parser.h   |  74 ++++++++++++---
+ Nef_2/include/CGAL/Nef_polyhedron_2.h     |   2 +
+ Nef_S2/include/CGAL/Nef_S2/SM_io_parser.h | 106 ++++++++++++++++------
+ 3 files changed, 142 insertions(+), 40 deletions(-)
+
+diff --git a/Nef_2/include/CGAL/Nef_2/PM_io_parser.h b/Nef_2/include/CGAL/Nef_2/PM_io_parser.h
+index 85295f3d85a..9b84dd37fbe 100644
+--- a/Nef_2/include/CGAL/Nef_2/PM_io_parser.h
++++ b/Nef_2/include/CGAL/Nef_2/PM_io_parser.h
+@@ -200,6 +200,11 @@ bool PM_io_parser<PMDEC>::read_vertex(Vertex_handle v)
+        !(in >> p) ||
+        !check_sep("}") ) return false;
+ 
++  if(!(f >= 0 && ((iso && f < fn) || (!iso && f < en))))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   if (iso) v->set_face(Face_of[f]);
+   else     v->set_halfedge(Halfedge_of[f]);
+   mark(v) = m; point(v) = p;
+@@ -229,10 +234,14 @@ bool PM_io_parser<PMDEC>::read_hedge(Halfedge_handle e)
+        !(in >> f) || !check_sep(",") ||
+        !(in >> m) || !check_sep("}") )
+     return false;
+-  CGAL_assertion_msg
+-     (eo >= 0 || (std::size_t) eo < en || epr >= 0 || (std::size_t) epr < en || ene >= 0 || (std::size_t) ene < en ||
+-      v >= 0 || (std::size_t) v < vn || f >= 0 || (std::size_t) f < fn ,
+-      "wrong index in read_hedge");
++
++  if(!(eo >= 0 && (std::size_t) eo < en && epr >= 0 && (std::size_t) epr < en && ene >= 0 && (std::size_t) ene < en &&
++       v >= 0 && (std::size_t) v < vn && f >= 0 && (std::size_t) f < fn ))
++  {
++    in.clear(std::ios_base::badbit);
++    std::cerr<<"wrong index in read_hedge"<<std::endl;
++    return false;
++  }
+ 
+   // precond: objects exist!
+   CGAL_assertion(EI[e->opposite()]);
+@@ -267,14 +276,32 @@ bool PM_io_parser<PMDEC>::read_face(Face_handle f)
+   int n, ei, vi; Mark m;
+   if ( !(in >> n) || !check_sep("{") ) return false;
+   if ( !(in >> ei) || !check_sep(",") ) return false;
+-  if (ei >= 0) f->set_halfedge(Halfedge_of[ei]);
++  if (ei >= 0 && ei < en)
++  {
++    f->set_halfedge(Halfedge_of[ei]);
++  }
++  else
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   while (in >> ei) {
+     CGAL_assertion_msg(ei >= 0 && (std::size_t) ei < en, "wrong index in face cycle list.");
++    if (!(ei >= 0 && ei < en))
++    {
++      in.clear(std::ios_base::badbit);
++      return false;
++    }
+     f->store_fc(Halfedge_of[ei]);
+   } in.clear();
+   if (!check_sep(",")) { return false; }
+   while (in >> vi) {
+     CGAL_assertion_msg(vi >= 0 && (std::size_t) vi < vn, "wrong index in iso vertex list.");
++    if (!(vi >= 0 && vi < vn))
++    {
++      in.clear(std::ios_base::badbit);
++      return false;
++    }
+     f->store_iv(Vertex_of[vi]);
+   } in.clear();
+   if (!check_sep(",") || !(in >> m) || !check_sep("}") )
+@@ -313,13 +340,26 @@ template <typename PMDEC>
+ void PM_io_parser<PMDEC>::read()
+ {
+   if ( !check_sep("Plane_map_2") )
+-    CGAL_error_msg("PM_io_parser::read: no embedded_PM header.");
++  {
++    std::cerr<<"PM_io_parser::read: no embedded_PM header."<<std::endl;
++    return;
++  }
+   if ( !(check_sep("vertices") && (in >> vn)) )
+-    CGAL_error_msg("PM_io_parser::read: wrong node line.");
++  {
++    std::cerr<<"PM_io_parser::read: wrong node line."<<std::endl;
++    return;
++  }
++
+   if ( !(check_sep("halfedges") && (in >> en) && (en%2==0)) )
+-    CGAL_error_msg("PM_io_parser::read: wrong edge line.");
++  {
++    std::cerr<<"PM_io_parser::read: wrong edge line."<<std::endl;
++    return;
++  }
+   if ( !(check_sep("faces") && (in >> fn)) )
+-    CGAL_error_msg("PM_io_parser::read: wrong face line.");
++  {
++    std::cerr<<"PM_io_parser::read: wrong face line."<<std::endl;
++    return;
++  }
+ 
+   Vertex_of.resize(vn);
+   Halfedge_of.resize(en);
+@@ -333,16 +373,24 @@ void PM_io_parser<PMDEC>::read()
+ 
+   for(i=0; i<vn; i++) {
+     if (!read_vertex(Vertex_of[i]))
+-      CGAL_error_msg("PM_io_parser::read: error in node line");
++    {
++      std::cerr<<"PM_io_parser::read: error in node line"<<std::endl;
++      return;
++    }
+   }
+   for(i=0; i<en; i++) {
+     if (!read_hedge(Halfedge_of[i]))
+-      CGAL_error_msg("PM_io_parser::read: error in halfedge\
+-      line");
++    {
++      std::cerr<<"PM_io_parser::read: error in halfedge line"<<std::endl;
++      return;
++    }
+   }
+   for(i=0; i<fn; i++) {
+     if (!read_face(Face_of[i]))
+-      CGAL_error_msg("PM_io_parser::read: error in face line");
++    {
++      std::cerr<<"PM_io_parser::read: error in face line"<<std::endl;
++      return;
++    }
+   }
+ }
+ 
+diff --git a/Nef_2/include/CGAL/Nef_polyhedron_2.h b/Nef_2/include/CGAL/Nef_polyhedron_2.h
+index 92c54593386..62aad3e5649 100644
+--- a/Nef_2/include/CGAL/Nef_polyhedron_2.h
++++ b/Nef_2/include/CGAL/Nef_polyhedron_2.h
+@@ -1112,6 +1112,8 @@ std::istream& operator>>
+     std::cerr << "Nef_polyhedron_2 input corrupted." << std::endl;
+     NP = Nef_polyhedron_2<T,Items,Mark>();
+   }
++  if(!is)
++    return is;
+   typename Nef_polyhedron_2<T,Items,Mark>::Topological_explorer D(NP.explorer());
+   D.check_integrity_and_topological_planarity();
+   return is;
+diff --git a/Nef_S2/include/CGAL/Nef_S2/SM_io_parser.h b/Nef_S2/include/CGAL/Nef_S2/SM_io_parser.h
+index 7bddd3036d5..631c63dc5dc 100644
+--- a/Nef_S2/include/CGAL/Nef_S2/SM_io_parser.h
++++ b/Nef_S2/include/CGAL/Nef_S2/SM_io_parser.h
+@@ -203,8 +203,14 @@ bool SM_io_parser<Decorator_>::read_vertex(SVertex_handle v)
+        !(in >> p) ||
+        !check_sep("}") ) return false;
+ 
+-  if (iso) set_face(v,SFace_of[f]);
+-  else     set_first_out_edge(v,Edge_of[f]);
++  if(f<0 || (iso && f > fn) || (!iso && f > en))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
++
++  if (iso) this->set_face(v,SFace_of[f]);
++  else     this->set_first_out_edge(v,Edge_of[f]);
+   v->mark() = m; v->point() = p;
+   return true;
+ }
+@@ -235,17 +241,21 @@ bool SM_io_parser<Decorator_>::read_edge(SHalfedge_handle e)
+        !(in >> m) || !check_sep(",") ||
+        !(in >> k) || !check_sep("}") )
+     return false;
+-  CGAL_assertion_msg
++  if (!
+      (eo >= 0 && eo < en && epr >= 0 && epr < en && ene >= 0 && ene < en &&
+-      v >= 0 && v < vn && f >= 0 && f < fn ,
+-      "wrong index in read_edge");
++      v >= 0 && v < vn && f >= 0 && f < fn ))
++  {
++    std::cerr<<"wrong index in read_edge"<<std::endl;
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+ 
+   // precond: features exist!
+   CGAL_assertion(EI[e->twin()]);
+-  set_prev(e,Edge_of[epr]);
+-  set_next(e,Edge_of[ene]);
+-  set_source(e,SVertex_of[v]);
+-  set_face(e,SFace_of[f]);
++  this->set_prev(e,Edge_of[epr]);
++  this->set_next(e,Edge_of[ene]);
++  this->set_source(e,SVertex_of[v]);
++  this->set_face(e,SFace_of[f]);
+   e->mark() = m;
+   e->circle() = k;
+   return true;
+@@ -274,7 +284,7 @@ bool SM_io_parser<Decorator_>::read_loop(SHalfloop_handle l)
+   CGAL_assertion_msg(
+     (lo >= 0 && lo < 2 && f >= 0 && f < fn),"wrong index in read_edge");
+ 
+-  set_face(l,SFace_of[f]);
++  this->set_face(l,SFace_of[f]);
+   l->mark() = m;
+   l->circle() = k;
+   return true;
+@@ -303,21 +313,33 @@ bool SM_io_parser<Decorator_>::read_face(SFace_handle f)
+   int n, ei, vi, li; Mark m;
+   if ( !(in >> n) || !check_sep("{") ) return false;
+   while (in >> ei) {
+-    CGAL_assertion_msg(ei >= 0 && ei < en,
+-                           "wrong index in face cycle list.");
+-    store_sm_boundary_object(Edge_of[ei],f);
++    if(!(ei >= 0 && ei < en))
++    {
++      std::cerr<<"wrong index in face cycle list."<<std::endl;
++      in.clear(std::ios_base::badbit);
++      return false;
++    }
++    this->store_sm_boundary_object(Edge_of[ei],f);
+   } in.clear();
+   if (!check_sep(",")) { return false; }
+   while (in >> vi) {
+-    CGAL_assertion_msg(vi >= 0 && vi < vn,
+-                           "wrong index in iso vertex list.");
+-    store_sm_boundary_object(SVertex_of[vi],f);
++    if(!(vi >= 0 && vi < vn))
++    {
++      std::cerr<<"wrong index in iso vertex list."<<std::endl;
++      in.clear(std::ios_base::badbit);
++      return false;
++    }
++    this->store_sm_boundary_object(SVertex_of[vi],f);
+   } in.clear();
+   if (!check_sep(",")) { return false; }
+   while (in >> li) {
+-    CGAL_assertion_msg(li >= 0 && li < 2,
+-                           "wrong index in iso vertex list.");
+-    store_sm_boundary_object(Loop_of[li],f);
++    if(!(li >= 0 && li < 2))
++    {
++      std::cerr<<"wrong index in iso vertex list."<<std::endl;
++      in.clear(std::ios_base::badbit);
++      return false;
++    }
++    this->store_sm_boundary_object(Loop_of[li],f);
+   } in.clear();
+   if (!check_sep(",") || !(in >> m) || !check_sep("}") )
+     return false;
+@@ -357,16 +379,36 @@ void SM_io_parser<Decorator_>::print() const
+ template <typename Decorator_>
+ void SM_io_parser<Decorator_>::read()
+ {
++  if ( !check_sep("Nef_polyhedron_S2") )
++  {
++   std::cerr<<"Missing line in header"<<std::endl;
++   return;
++  }
+   if ( !check_sep("Sphere_map_2") )
+-    CGAL_error_msg("SM_io_parser::read: no embedded_PM header.");
++  {
++   std::cerr<<"SM_io_parser::read: no embedded_PM header."<<std::endl;
++   return;
++  }
+   if ( !(check_sep("vertices") && (in >> vn)) )
+-    CGAL_error_msg("SM_io_parser::read: wrong vertex line.");
++  {
++   std::cerr<<"SM_io_parser::read: wrong vertex line."<<std::endl;
++   return;
++  }
+   if ( !(check_sep("edges") && (in >> en) && (en%2==0)) )
+-    CGAL_error_msg("SM_io_parser::read: wrong edge line.");
++  {
++   std::cerr<<"SM_io_parser::read: wrong edge line."<<std::endl;
++   return;
++  }
+   if ( !(check_sep("loops") && (in >> ln)) )
+-    CGAL_error_msg("SM_io_parser::read: wrong loop line.");
++  {
++   std::cerr<<"SM_io_parser::read: wrong loop line."<<std::endl;
++   return;
++  }
+   if ( !(check_sep("faces") && (in >> fn)) )
+-    CGAL_error_msg("SM_io_parser::read: wrong face line.");
++  {
++   std::cerr<<"SM_io_parser::read: wrong face line."<<std::endl;
++   return;
++  }
+ 
+   SVertex_of.resize(vn);
+   Edge_of.resize(en);
+@@ -383,18 +425,28 @@ void SM_io_parser<Decorator_>::read()
+ 
+   for(i=0; i<vn; i++) {
+     if (!read_vertex(SVertex_of[i]))
+-      CGAL_error_msg("SM_io_parser::read: error in node line");
++    {
++     std::cerr<<"SM_io_parser::read: error in node line"<<std::endl;
++     return;
++    }
+   }
+   for(i=0; i<en; i++) {
+     if (!read_edge(Edge_of[i]))
+-      CGAL_error_msg("SM_io_parser::read: error in edge line");
++    {
++     std::cerr<<"SM_io_parser::read: error in edge line"<<std::endl;
++     return;
++    }
++
+   }
+   if ( ln == 2 ) {
+     read_loop(Loop_of[0]); read_loop(Loop_of[1]);
+   }
+   for(i=0; i<fn; i++) {
+     if (!read_face(SFace_of[i]))
+-      CGAL_error_msg("SM_io_parser::read: error in face line");
++    {
++     std::cerr<<"SM_io_parser::read: error in face line"<<std::endl;
++     return;
++    }
+   }
+ }
+ 
+
+From 5a1ab45058112f8647c14c02f58905ecc597ec76 Mon Sep 17 00:00:00 2001
+From: Maxime Gimeno <maxime.gimeno@gmail.com>
+Date: Tue, 19 Jan 2021 12:24:08 +0100
+Subject: [PATCH 2/8] Fix Nef_3
+
+---
+ Nef_3/include/CGAL/Nef_3/SNC_io_parser.h | 195 ++++++++++++++++++++++-
+ 1 file changed, 188 insertions(+), 7 deletions(-)
+
+diff --git a/Nef_3/include/CGAL/Nef_3/SNC_io_parser.h b/Nef_3/include/CGAL/Nef_3/SNC_io_parser.h
+index 5eee7528ee7..04d9d0ac8e8 100644
+--- a/Nef_3/include/CGAL/Nef_3/SNC_io_parser.h
++++ b/Nef_3/include/CGAL/Nef_3/SNC_io_parser.h
+@@ -1444,40 +1444,61 @@ void SNC_io_parser<EW>::read_items(int plus01) {
+   typename std::vector<Vertex_iterator>::iterator vi;
+   for(vi=Vertex_of.begin(); vi!=Vertex_of.end(); ++vi) {
+     if (!read_vertex<K>(*vi))
+-      CGAL_error_msg("SNC_io_parser::read: error in node line");
++    {
++      std::cerr<<"SNC_io_parser::read: error in node line"<<std::endl;
++      return;
++    }
+   }
+ 
+   typename std::vector<Halfedge_iterator>::iterator ei;
+   for(ei=Edge_of.begin(); ei!=Edge_of.end(); ++ei) {
+     if (!read_edge<K>(*ei))
+-      CGAL_error_msg("SNC_io_parser::read: error in edge line");
++    {
++      std::cerr<<"SNC_io_parser::read: error in edge line"<<std::endl;
++      return;
++    }
+   }
+ 
+   typedef typename std::vector<Halffacet_iterator>::iterator vhf_iterator;
+   vhf_iterator fi;
+   for(fi=Halffacet_of.begin(); fi!=Halffacet_of.end(); ++fi) {
+     if (!read_facet<K>(*fi))
+-      CGAL_error_msg("SNC_io_parser::read: error in facet line");
++    {
++      std::cerr<<"SNC_io_parser::read: error in facet line"<<std::endl;
++      return;
++    }
+   }
+   typename std::vector<Volume_iterator>::iterator ci;
+   for(ci=Volume_of.begin()+plus01; ci!=Volume_of.end(); ++ci) {
+     if (!read_volume(*ci))
+-      CGAL_error_msg("SNC_io_parser::read: error in volume line");
++    {
++      std::cerr<<"SNC_io_parser::read: error in volume line"<<std::endl;
++      return;
++    }
+   }
+   typename std::vector<SHalfedge_iterator>::iterator sei;
+   for(sei=SEdge_of.begin(); sei!=SEdge_of.end(); ++sei) {
+     if (!read_sedge<K>(*sei))
+-      CGAL_error_msg("SNC_io_parser::read: error in sedge line");
++    {
++      std::cerr<<"SNC_io_parser::read: error in sedge line"<<std::endl;
++      return;
++    }
+   }
+   typename std::vector<SHalfloop_iterator>::iterator sli;
+   for(sli=SLoop_of.begin(); sli!=SLoop_of.end(); ++sli) {
+     if (!read_sloop<K>(*sli))
+-      CGAL_error_msg("SNC_io_parser::read: error in sloop line");
++    {
++      std::cerr<<"SNC_io_parser::read: error in sloop line"<<std::endl;
++      return;
++    }
+   }
+   typename std::vector<SFace_iterator>::iterator sfi;
+   for(sfi=SFace_of.begin(); sfi!=SFace_of.end(); ++sfi) {
+     if (!read_sface(*sfi))
+-      CGAL_error_msg("SNC_io_parser::read: error in sface line");
++    {
++      std::cerr<<"SNC_io_parser::read: error in sface line"<<std::endl;
++      return;
++    }
+   }
+ 
+   SNC_constructor C(*this->sncp());
+@@ -1535,21 +1556,56 @@ read_vertex(Vertex_handle vh) {
+   vh->sncp() = this->sncp();
+ 
+   in >> index;
++  if(index >= int(en))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   vh->svertices_begin() = (index >= 0 ? Edge_of[index] : this->svertices_end());
+   in >> index;
++  if(index >= int(en))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   vh->svertices_last()  = index >= 0 ? Edge_of[index] : this->svertices_end();
+   OK = OK && test_string(",");
+   in >> index;
++  if(index >= int(sen))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   vh->shalfedges_begin() = index >= 0 ? SEdge_of[index] : this->shalfedges_end();
+   in >> index;
++  if(index >= int(sen))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   vh->shalfedges_last()  = index >= 0 ? SEdge_of[index] : this->shalfedges_end();
+   OK = OK && test_string(",");
+   in >> index;
++  if(index >= int(sfn))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   vh->sfaces_begin() = index >= 0 ? SFace_of[index] : this->sfaces_end();
+   in >> index;
++  if(index >= int(sfn))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   vh->sfaces_last()  = index >= 0 ? SFace_of[index] : this->sfaces_end();
+   OK = OK && test_string(",");
+   in >> index;
++  if(index >= int(sln))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   vh->shalfloop() = index >= 0 ? SLoop_of[index] : this->shalfloops_end();
+   OK = OK && test_string("|");
+ #ifdef CGAL_NEF_NATURAL_COORDINATE_INPUT
+@@ -1604,17 +1660,37 @@ read_edge(Halfedge_handle eh) {
+   OK = OK && test_string("{");
+ 
+   in >> index;
++  if(index < 0 || index >= int(en))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   eh->twin() = Edge_of[index];
+   OK = OK && test_string(",");
+   in >> index;
++  if(index < 0 || index >= int(vn))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   eh->center_vertex() = Vertex_of[index];
+   OK = OK && test_string(",");
+   in >> index;
+   if(index == 0) {
+     in >> index;
++    if(index < 0 || index >= int(sen))
++    {
++      in.clear(std::ios_base::badbit);
++      return false;
++    }
+     eh->out_sedge() = SEdge_of[index];
+   } else {
+     in >> index;
++    if(index < 0 || index >= int(sfn))
++    {
++      in.clear(std::ios_base::badbit);
++      return false;
++    }
+     eh->incident_sface() = SFace_of[index];
+   }
+   OK = OK && test_string("|");
+@@ -1669,6 +1745,11 @@ read_facet(Halffacet_handle fh) {
+   OK = OK && test_string("{");
+ 
+   in >> index;
++  if(index < 0 || index >= int(fn))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   fh->twin() = Halffacet_of[index];
+   OK = OK && test_string(",");
+ 
+@@ -1676,6 +1757,11 @@ read_facet(Halffacet_handle fh) {
+   while(isdigit(cc)) {
+     in.putback(cc);
+     in >> index;
++    if(index < 0 || index >= int(sen))
++    {
++      in.clear(std::ios_base::badbit);
++      return false;
++    }
+     fh->boundary_entry_objects().push_back(make_object(SEdge_of[index]));
+     in >> cc;
+   }
+@@ -1684,11 +1770,21 @@ read_facet(Halffacet_handle fh) {
+   while(isdigit(cc)) {
+     in.putback(cc);
+     in >> index;
++    if(index < 0 || index >= int(sln))
++    {
++      in.clear(std::ios_base::badbit);
++      return false;
++    }
+     fh->boundary_entry_objects().push_back(make_object(SLoop_of[index]));
+     in >> cc;
+   }
+ 
+   in >> index;
++  if(index < 0  || index >= int(vn))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   fh->incident_volume() = Volume_of[index+addInfiBox];
+   OK = OK && test_string("|");
+ #ifdef CGAL_NEF_NATURAL_COORDINATE_INPUT
+@@ -1731,6 +1827,11 @@ read_volume(Volume_handle ch) {
+   while(isdigit(cc)) {
+     in.putback(cc);
+     in >> index;
++    if(index < 0 || index >= int(sfn))
++    {
++      in.clear(std::ios_base::badbit);
++      return false;
++    }
+     ch->shell_entry_objects().push_back(make_object(SFace_of[index]));
+     in >> cc;
+   }
+@@ -1781,27 +1882,67 @@ read_sedge(SHalfedge_handle seh) {
+   OK = OK && test_string("{");
+ 
+   in >> index;
++  if(index < 0 || index >= int(sen))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   seh->twin() = SEdge_of[index];
+   OK = OK && test_string(",");
+   in >> index;
++  if(index < 0 || index >= int(sen))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   seh->sprev() = SEdge_of[index];
+   OK = OK && test_string(",");
+   in >> index;
++  if(index < 0 || index >= int(sen))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   seh->snext() = SEdge_of[index];
+   OK = OK && test_string(",");
+   in >> index;
++  if(index < 0 || index >= int(en))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   seh->source() = Edge_of[index];
+   OK = OK && test_string(",");
+   in >> index;
++  if(index < 0 || index >= int(sfn))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   seh->incident_sface() = SFace_of[index];
+   OK = OK && test_string(",");
+   in >> index;
++  if(index < 0 || index >= int(sen))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   seh->prev() = SEdge_of[index];
+   OK = OK && test_string(",");
+   in >> index;
++  if(index < 0 || index >= int(sen))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   seh->next() = SEdge_of[index];
+   OK = OK && test_string(",");
+   in >> index;
++  if(index < 0 || index >= int(fn))
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   seh->facet() = Halffacet_of[index];
+   OK = OK && test_string("|");
+ #ifdef CGAL_NEF_NATURAL_COORDINATE_INPUT
+@@ -1852,12 +1993,27 @@ read_sloop(SHalfloop_handle slh) {
+   OK = OK && test_string("{");
+ 
+   in >> index;
++  if(index < 0 || index >= sln)
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   slh->twin() = SLoop_of[index];
+   OK = OK && test_string(",");
+   in >> index;
++  if(index < 0 || index >= sfn)
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   slh->incident_sface() = SFace_of[index];
+   OK = OK && test_string(",");
+   in >> index;
++  if(index < 0 || index >= fn)
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   slh->facet() = Halffacet_of[index];
+   OK = OK && test_string("|");
+ #ifdef CGAL_NEF_NATURAL_COORDINATE_INPUT
+@@ -1904,6 +2060,11 @@ read_sface(SFace_handle sfh) {
+   OK = OK && test_string("{");
+ 
+   in >> index;
++  if(index < 0 || index >= vn)
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   sfh->center_vertex() = Vertex_of[index];
+   OK = OK && test_string(",");
+ 
+@@ -1913,6 +2074,11 @@ read_sface(SFace_handle sfh) {
+     in >> index;
+     //    sfh->boundary_entry_objects().push_back(SEdge_of[index]);
+     SM_decorator SD(&*sfh->center_vertex());
++    if(index < 0 || index >= sen)
++    {
++      in.clear(std::ios_base::badbit);
++      return false;
++    }
+     SD.link_as_face_cycle(SEdge_of[index],sfh);
+     in >> cc;
+   }
+@@ -1921,6 +2087,11 @@ read_sface(SFace_handle sfh) {
+   while(isdigit(cc)) {
+     in.putback(cc);
+     in >> index;
++    if(index < 0 || index >= en)
++    {
++      in.clear(std::ios_base::badbit);
++      return false;
++    }
+     sfh->boundary_entry_objects().push_back(make_object(Edge_of[index]));
+     this->sncp()->store_sm_boundary_item(Edge_of[index], --(sfh->sface_cycles_end()));
+     in >> cc;
+@@ -1930,12 +2101,22 @@ read_sface(SFace_handle sfh) {
+   while(isdigit(cc)) {
+     in.putback(cc);
+     in >> index;
++    if(index < 0 || index >= sln)
++    {
++      in.clear(std::ios_base::badbit);
++      return false;
++    }
+     sfh->boundary_entry_objects().push_back(make_object(SLoop_of[index]));
+     this->sncp()->store_sm_boundary_item(SLoop_of[index], --(sfh->sface_cycles_end()));
+     in >> cc;
+   }
+ 
+   in >> index;
++  if(index < 0 || index >= vn)
++  {
++    in.clear(std::ios_base::badbit);
++    return false;
++  }
+   sfh->volume() = Volume_of[index+addInfiBox];
+   OK = OK && test_string("}");
+   in >> sfh->mark();
+
+From 9e291e6bbfe23137fb2dd3a0f8d6461229ca2376 Mon Sep 17 00:00:00 2001
+From: Maxime Gimeno <maxime.gimeno@gmail.com>
+Date: Tue, 19 Jan 2021 14:04:54 +0100
+Subject: [PATCH 3/8] replace cerr by CGAL_warning_msg
+
+---
+ Nef_2/include/CGAL/Nef_2/PM_io_parser.h   | 14 +++---
+ Nef_3/include/CGAL/Nef_3/SNC_io_parser.h  | 53 ++++++++++++++++-------
+ Nef_S2/include/CGAL/Nef_S2/SM_io_parser.h | 18 ++++----
+ 3 files changed, 54 insertions(+), 31 deletions(-)
+
+diff --git a/Nef_2/include/CGAL/Nef_2/PM_io_parser.h b/Nef_2/include/CGAL/Nef_2/PM_io_parser.h
+index 9b84dd37fbe..52bc830e115 100644
+--- a/Nef_2/include/CGAL/Nef_2/PM_io_parser.h
++++ b/Nef_2/include/CGAL/Nef_2/PM_io_parser.h
+@@ -341,23 +341,23 @@ void PM_io_parser<PMDEC>::read()
+ {
+   if ( !check_sep("Plane_map_2") )
+   {
+-    std::cerr<<"PM_io_parser::read: no embedded_PM header."<<std::endl;
++    CGAL_warning_msg(false, "PM_io_parser::read: no embedded_PM header.");
+     return;
+   }
+   if ( !(check_sep("vertices") && (in >> vn)) )
+   {
+-    std::cerr<<"PM_io_parser::read: wrong node line."<<std::endl;
++    CGAL_warning_msg(false, "PM_io_parser::read: wrong node line.");
+     return;
+   }
+ 
+   if ( !(check_sep("halfedges") && (in >> en) && (en%2==0)) )
+   {
+-    std::cerr<<"PM_io_parser::read: wrong edge line."<<std::endl;
++    CGAL_warning_msg(false, "PM_io_parser::read: wrong edge line.");
+     return;
+   }
+   if ( !(check_sep("faces") && (in >> fn)) )
+   {
+-    std::cerr<<"PM_io_parser::read: wrong face line."<<std::endl;
++    CGAL_warning_msg(false, "PM_io_parser::read: wrong face line.");
+     return;
+   }
+ 
+@@ -374,21 +374,21 @@ void PM_io_parser<PMDEC>::read()
+   for(i=0; i<vn; i++) {
+     if (!read_vertex(Vertex_of[i]))
+     {
+-      std::cerr<<"PM_io_parser::read: error in node line"<<std::endl;
++      CGAL_warning_msg(false, "PM_io_parser::read: error in node line");
+       return;
+     }
+   }
+   for(i=0; i<en; i++) {
+     if (!read_hedge(Halfedge_of[i]))
+     {
+-      std::cerr<<"PM_io_parser::read: error in halfedge line"<<std::endl;
++      CGAL_warning_msg(false, "PM_io_parser::read: error in halfedge line");
+       return;
+     }
+   }
+   for(i=0; i<fn; i++) {
+     if (!read_face(Face_of[i]))
+     {
+-      std::cerr<<"PM_io_parser::read: error in face line"<<std::endl;
++      CGAL_warning_msg(false, "PM_io_parser::read: error in face line");
+       return;
+     }
+   }
+diff --git a/Nef_3/include/CGAL/Nef_3/SNC_io_parser.h b/Nef_3/include/CGAL/Nef_3/SNC_io_parser.h
+index 04d9d0ac8e8..21c54dd4133 100644
+--- a/Nef_3/include/CGAL/Nef_3/SNC_io_parser.h
++++ b/Nef_3/include/CGAL/Nef_3/SNC_io_parser.h
+@@ -1400,24 +1400,47 @@ template <typename EW>
+ void SNC_io_parser<EW>::read()
+ {
+   if ( !check_sep("Selective Nef Complex") )
+-    CGAL_error_msg("SNC_io_parser::read: no SNC header.");
++  {
++    CGAL_warning_msg(false, "SNC_io_parser::read: no SNC header.");
++    returnl
++  }
+   std::string kernel_type;
+   in >> kernel_type;
+   CGAL_assertion(kernel_type == "standard" || kernel_type == "extended");
+   if ( !(check_sep("vertices") && (in >> vn)) )
+-    CGAL_error_msg("SNC_io_parser::read: wrong vertex line.");
++  {
++    CGAL_warning_msg(false, "SNC_io_parser::read: wrong vertex line.");
++    return;
++  }
+   if ( !(check_sep("halfedges") && (in >> en) && (en%2==0)) )
+-    CGAL_error_msg("SNC_io_parser::read: wrong edge line.");
++  {
++    CGAL_warning_msg(false, "SNC_io_parser::read: wrong edge line.");
++    return;
++  }
+   if ( !(check_sep("facets") && (in >> fn) && (fn%2==0)) )
+-    CGAL_error_msg("SNC_io_parser::read: wrong facet line.");
++  {
++    CGAL_warning_msg(false, "SNC_io_parser::read: wrong facet line.");
++  }
+   if ( !(check_sep("volumes") && (in >> cn)) )
+-    CGAL_error_msg("SNC_io_parser::read: wrong volume line.");
++  {
++    CGAL_warning_msg(false, "SNC_io_parser::read: wrong volume line.");
++    return;
++  }
+   if ( !(check_sep("shalfedges") && (in >> sen)) )
+-    CGAL_error_msg("SNC_io_parser::read: wrong sedge line.");
++  {
++   CGAL_warning_msg(false, "SNC_io_parser::read: wrong sedge line.");
++   return;
++  }
+   if ( !(check_sep("shalfloops") && (in >> sln)) )
+-    CGAL_error_msg("SNC_io_parser::read: wrong sloop line.");
++  {
++    CGAL_warning_msg(false, "SNC_io_parser::read: wrong sloop line.");
++    return;
++  }
+   if ( !(check_sep("sfaces") && (in >> sfn)) )
+-    CGAL_error_msg("SNC_io_parser::read: wrong sface line.");
++  {
++    CGAL_warning_msg(false, "SNC_io_parser::read: wrong sface line.");
++    return;
++  }
+ 
+   addInfiBox = (kernel_type == "standard" && Infi_box::extended_kernel());
+ 
+@@ -1445,7 +1468,7 @@ void SNC_io_parser<EW>::read_items(int plus01) {
+   for(vi=Vertex_of.begin(); vi!=Vertex_of.end(); ++vi) {
+     if (!read_vertex<K>(*vi))
+     {
+-      std::cerr<<"SNC_io_parser::read: error in node line"<<std::endl;
++      CGAL_warning_msg(false, "SNC_io_parser::read: error in node line");
+       return;
+     }
+   }
+@@ -1454,7 +1477,7 @@ void SNC_io_parser<EW>::read_items(int plus01) {
+   for(ei=Edge_of.begin(); ei!=Edge_of.end(); ++ei) {
+     if (!read_edge<K>(*ei))
+     {
+-      std::cerr<<"SNC_io_parser::read: error in edge line"<<std::endl;
++      CGAL_warning_msg(false, "SNC_io_parser::read: error in edge line");
+       return;
+     }
+   }
+@@ -1464,7 +1487,7 @@ void SNC_io_parser<EW>::read_items(int plus01) {
+   for(fi=Halffacet_of.begin(); fi!=Halffacet_of.end(); ++fi) {
+     if (!read_facet<K>(*fi))
+     {
+-      std::cerr<<"SNC_io_parser::read: error in facet line"<<std::endl;
++      CGAL_warning_msg(false, "SNC_io_parser::read: error in facet line");
+       return;
+     }
+   }
+@@ -1472,7 +1495,7 @@ void SNC_io_parser<EW>::read_items(int plus01) {
+   for(ci=Volume_of.begin()+plus01; ci!=Volume_of.end(); ++ci) {
+     if (!read_volume(*ci))
+     {
+-      std::cerr<<"SNC_io_parser::read: error in volume line"<<std::endl;
++      CGAL_warning_msg(false, "SNC_io_parser::read: error in volume line");
+       return;
+     }
+   }
+@@ -1480,7 +1503,7 @@ void SNC_io_parser<EW>::read_items(int plus01) {
+   for(sei=SEdge_of.begin(); sei!=SEdge_of.end(); ++sei) {
+     if (!read_sedge<K>(*sei))
+     {
+-      std::cerr<<"SNC_io_parser::read: error in sedge line"<<std::endl;
++      CGAL_warning_msg(false, "SNC_io_parser::read: error in sedge line");
+       return;
+     }
+   }
+@@ -1488,7 +1511,7 @@ void SNC_io_parser<EW>::read_items(int plus01) {
+   for(sli=SLoop_of.begin(); sli!=SLoop_of.end(); ++sli) {
+     if (!read_sloop<K>(*sli))
+     {
+-      std::cerr<<"SNC_io_parser::read: error in sloop line"<<std::endl;
++      CGAL_warning_msg(false, "SNC_io_parser::read: error in sloop line");
+       return;
+     }
+   }
+@@ -1496,7 +1519,7 @@ void SNC_io_parser<EW>::read_items(int plus01) {
+   for(sfi=SFace_of.begin(); sfi!=SFace_of.end(); ++sfi) {
+     if (!read_sface(*sfi))
+     {
+-      std::cerr<<"SNC_io_parser::read: error in sface line"<<std::endl;
++      CGAL_warning_msg(false, "SNC_io_parser::read: error in sface line");
+       return;
+     }
+   }
+diff --git a/Nef_S2/include/CGAL/Nef_S2/SM_io_parser.h b/Nef_S2/include/CGAL/Nef_S2/SM_io_parser.h
+index 631c63dc5dc..a9377719f93 100644
+--- a/Nef_S2/include/CGAL/Nef_S2/SM_io_parser.h
++++ b/Nef_S2/include/CGAL/Nef_S2/SM_io_parser.h
+@@ -381,32 +381,32 @@ void SM_io_parser<Decorator_>::read()
+ {
+   if ( !check_sep("Nef_polyhedron_S2") )
+   {
+-   std::cerr<<"Missing line in header"<<std::endl;
++   CGAL_warning_msg(false, "Missing line in header");
+    return;
+   }
+   if ( !check_sep("Sphere_map_2") )
+   {
+-   std::cerr<<"SM_io_parser::read: no embedded_PM header."<<std::endl;
++   CGAL_warning_msg(false, "SM_io_parser::read: no embedded_PM header.");
+    return;
+   }
+   if ( !(check_sep("vertices") && (in >> vn)) )
+   {
+-   std::cerr<<"SM_io_parser::read: wrong vertex line."<<std::endl;
++   CGAL_warning_msg(false, "SM_io_parser::read: wrong vertex line.");
+    return;
+   }
+   if ( !(check_sep("edges") && (in >> en) && (en%2==0)) )
+   {
+-   std::cerr<<"SM_io_parser::read: wrong edge line."<<std::endl;
++   CGAL_warning_msg(false, "SM_io_parser::read: wrong edge line.");
+    return;
+   }
+   if ( !(check_sep("loops") && (in >> ln)) )
+   {
+-   std::cerr<<"SM_io_parser::read: wrong loop line."<<std::endl;
++   CGAL_warning_msg(false, "SM_io_parser::read: wrong loop line.");
+    return;
+   }
+   if ( !(check_sep("faces") && (in >> fn)) )
+   {
+-   std::cerr<<"SM_io_parser::read: wrong face line."<<std::endl;
++   CGAL_warning_msg(false, "SM_io_parser::read: wrong face line.");
+    return;
+   }
+ 
+@@ -426,14 +426,14 @@ void SM_io_parser<Decorator_>::read()
+   for(i=0; i<vn; i++) {
+     if (!read_vertex(SVertex_of[i]))
+     {
+-     std::cerr<<"SM_io_parser::read: error in node line"<<std::endl;
++     CGAL_warning_msg(false, "SM_io_parser::read: error in node line");
+      return;
+     }
+   }
+   for(i=0; i<en; i++) {
+     if (!read_edge(Edge_of[i]))
+     {
+-     std::cerr<<"SM_io_parser::read: error in edge line"<<std::endl;
++     CGAL_warning_msg(false, "SM_io_parser::read: error in edge line");
+      return;
+     }
+ 
+@@ -444,7 +444,7 @@ void SM_io_parser<Decorator_>::read()
+   for(i=0; i<fn; i++) {
+     if (!read_face(SFace_of[i]))
+     {
+-     std::cerr<<"SM_io_parser::read: error in face line"<<std::endl;
++     CGAL_warning_msg(false, "SM_io_parser::read: error in face line");
+      return;
+     }
+   }
+
+From 2e592e0027b2d85680273425161581655f4677fd Mon Sep 17 00:00:00 2001
+From: Maxime Gimeno <maxime.gimeno@gmail.com>
+Date: Wed, 20 Jan 2021 08:38:33 +0100
+Subject: [PATCH 4/8] Fix typo and use setstate
+
+---
+ Nef_2/include/CGAL/Nef_2/PM_io_parser.h   | 10 ++--
+ Nef_3/include/CGAL/Nef_3/SNC_io_parser.h  | 66 +++++++++++------------
+ Nef_S2/include/CGAL/Nef_S2/SM_io_parser.h | 10 ++--
+ 3 files changed, 43 insertions(+), 43 deletions(-)
+
+diff --git a/Nef_2/include/CGAL/Nef_2/PM_io_parser.h b/Nef_2/include/CGAL/Nef_2/PM_io_parser.h
+index 52bc830e115..64a3e94916e 100644
+--- a/Nef_2/include/CGAL/Nef_2/PM_io_parser.h
++++ b/Nef_2/include/CGAL/Nef_2/PM_io_parser.h
+@@ -202,7 +202,7 @@ bool PM_io_parser<PMDEC>::read_vertex(Vertex_handle v)
+ 
+   if(!(f >= 0 && ((iso && f < fn) || (!iso && f < en))))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   if (iso) v->set_face(Face_of[f]);
+@@ -238,7 +238,7 @@ bool PM_io_parser<PMDEC>::read_hedge(Halfedge_handle e)
+   if(!(eo >= 0 && (std::size_t) eo < en && epr >= 0 && (std::size_t) epr < en && ene >= 0 && (std::size_t) ene < en &&
+        v >= 0 && (std::size_t) v < vn && f >= 0 && (std::size_t) f < fn ))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     std::cerr<<"wrong index in read_hedge"<<std::endl;
+     return false;
+   }
+@@ -282,14 +282,14 @@ bool PM_io_parser<PMDEC>::read_face(Face_handle f)
+   }
+   else
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   while (in >> ei) {
+     CGAL_assertion_msg(ei >= 0 && (std::size_t) ei < en, "wrong index in face cycle list.");
+     if (!(ei >= 0 && ei < en))
+     {
+-      in.clear(std::ios_base::badbit);
++      in.setstate(std::ios_base::badbit);
+       return false;
+     }
+     f->store_fc(Halfedge_of[ei]);
+@@ -299,7 +299,7 @@ bool PM_io_parser<PMDEC>::read_face(Face_handle f)
+     CGAL_assertion_msg(vi >= 0 && (std::size_t) vi < vn, "wrong index in iso vertex list.");
+     if (!(vi >= 0 && vi < vn))
+     {
+-      in.clear(std::ios_base::badbit);
++      in.setstate(std::ios_base::badbit);
+       return false;
+     }
+     f->store_iv(Vertex_of[vi]);
+diff --git a/Nef_3/include/CGAL/Nef_3/SNC_io_parser.h b/Nef_3/include/CGAL/Nef_3/SNC_io_parser.h
+index 21c54dd4133..e5530445153 100644
+--- a/Nef_3/include/CGAL/Nef_3/SNC_io_parser.h
++++ b/Nef_3/include/CGAL/Nef_3/SNC_io_parser.h
+@@ -1402,7 +1402,7 @@ void SNC_io_parser<EW>::read()
+   if ( !check_sep("Selective Nef Complex") )
+   {
+     CGAL_warning_msg(false, "SNC_io_parser::read: no SNC header.");
+-    returnl
++    return;
+   }
+   std::string kernel_type;
+   in >> kernel_type;
+@@ -1581,14 +1581,14 @@ read_vertex(Vertex_handle vh) {
+   in >> index;
+   if(index >= int(en))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   vh->svertices_begin() = (index >= 0 ? Edge_of[index] : this->svertices_end());
+   in >> index;
+   if(index >= int(en))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   vh->svertices_last()  = index >= 0 ? Edge_of[index] : this->svertices_end();
+@@ -1596,14 +1596,14 @@ read_vertex(Vertex_handle vh) {
+   in >> index;
+   if(index >= int(sen))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   vh->shalfedges_begin() = index >= 0 ? SEdge_of[index] : this->shalfedges_end();
+   in >> index;
+   if(index >= int(sen))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   vh->shalfedges_last()  = index >= 0 ? SEdge_of[index] : this->shalfedges_end();
+@@ -1611,14 +1611,14 @@ read_vertex(Vertex_handle vh) {
+   in >> index;
+   if(index >= int(sfn))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   vh->sfaces_begin() = index >= 0 ? SFace_of[index] : this->sfaces_end();
+   in >> index;
+   if(index >= int(sfn))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   vh->sfaces_last()  = index >= 0 ? SFace_of[index] : this->sfaces_end();
+@@ -1626,7 +1626,7 @@ read_vertex(Vertex_handle vh) {
+   in >> index;
+   if(index >= int(sln))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   vh->shalfloop() = index >= 0 ? SLoop_of[index] : this->shalfloops_end();
+@@ -1685,7 +1685,7 @@ read_edge(Halfedge_handle eh) {
+   in >> index;
+   if(index < 0 || index >= int(en))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   eh->twin() = Edge_of[index];
+@@ -1693,7 +1693,7 @@ read_edge(Halfedge_handle eh) {
+   in >> index;
+   if(index < 0 || index >= int(vn))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   eh->center_vertex() = Vertex_of[index];
+@@ -1703,7 +1703,7 @@ read_edge(Halfedge_handle eh) {
+     in >> index;
+     if(index < 0 || index >= int(sen))
+     {
+-      in.clear(std::ios_base::badbit);
++      in.setstate(std::ios_base::badbit);
+       return false;
+     }
+     eh->out_sedge() = SEdge_of[index];
+@@ -1711,7 +1711,7 @@ read_edge(Halfedge_handle eh) {
+     in >> index;
+     if(index < 0 || index >= int(sfn))
+     {
+-      in.clear(std::ios_base::badbit);
++      in.setstate(std::ios_base::badbit);
+       return false;
+     }
+     eh->incident_sface() = SFace_of[index];
+@@ -1770,7 +1770,7 @@ read_facet(Halffacet_handle fh) {
+   in >> index;
+   if(index < 0 || index >= int(fn))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   fh->twin() = Halffacet_of[index];
+@@ -1782,7 +1782,7 @@ read_facet(Halffacet_handle fh) {
+     in >> index;
+     if(index < 0 || index >= int(sen))
+     {
+-      in.clear(std::ios_base::badbit);
++      in.setstate(std::ios_base::badbit);
+       return false;
+     }
+     fh->boundary_entry_objects().push_back(make_object(SEdge_of[index]));
+@@ -1795,7 +1795,7 @@ read_facet(Halffacet_handle fh) {
+     in >> index;
+     if(index < 0 || index >= int(sln))
+     {
+-      in.clear(std::ios_base::badbit);
++      in.setstate(std::ios_base::badbit);
+       return false;
+     }
+     fh->boundary_entry_objects().push_back(make_object(SLoop_of[index]));
+@@ -1805,7 +1805,7 @@ read_facet(Halffacet_handle fh) {
+   in >> index;
+   if(index < 0  || index >= int(vn))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   fh->incident_volume() = Volume_of[index+addInfiBox];
+@@ -1852,7 +1852,7 @@ read_volume(Volume_handle ch) {
+     in >> index;
+     if(index < 0 || index >= int(sfn))
+     {
+-      in.clear(std::ios_base::badbit);
++      in.setstate(std::ios_base::badbit);
+       return false;
+     }
+     ch->shell_entry_objects().push_back(make_object(SFace_of[index]));
+@@ -1907,7 +1907,7 @@ read_sedge(SHalfedge_handle seh) {
+   in >> index;
+   if(index < 0 || index >= int(sen))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   seh->twin() = SEdge_of[index];
+@@ -1915,7 +1915,7 @@ read_sedge(SHalfedge_handle seh) {
+   in >> index;
+   if(index < 0 || index >= int(sen))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   seh->sprev() = SEdge_of[index];
+@@ -1923,7 +1923,7 @@ read_sedge(SHalfedge_handle seh) {
+   in >> index;
+   if(index < 0 || index >= int(sen))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   seh->snext() = SEdge_of[index];
+@@ -1931,7 +1931,7 @@ read_sedge(SHalfedge_handle seh) {
+   in >> index;
+   if(index < 0 || index >= int(en))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   seh->source() = Edge_of[index];
+@@ -1939,7 +1939,7 @@ read_sedge(SHalfedge_handle seh) {
+   in >> index;
+   if(index < 0 || index >= int(sfn))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   seh->incident_sface() = SFace_of[index];
+@@ -1947,7 +1947,7 @@ read_sedge(SHalfedge_handle seh) {
+   in >> index;
+   if(index < 0 || index >= int(sen))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   seh->prev() = SEdge_of[index];
+@@ -1955,7 +1955,7 @@ read_sedge(SHalfedge_handle seh) {
+   in >> index;
+   if(index < 0 || index >= int(sen))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   seh->next() = SEdge_of[index];
+@@ -1963,7 +1963,7 @@ read_sedge(SHalfedge_handle seh) {
+   in >> index;
+   if(index < 0 || index >= int(fn))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   seh->facet() = Halffacet_of[index];
+@@ -2018,7 +2018,7 @@ read_sloop(SHalfloop_handle slh) {
+   in >> index;
+   if(index < 0 || index >= sln)
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   slh->twin() = SLoop_of[index];
+@@ -2026,7 +2026,7 @@ read_sloop(SHalfloop_handle slh) {
+   in >> index;
+   if(index < 0 || index >= sfn)
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   slh->incident_sface() = SFace_of[index];
+@@ -2034,7 +2034,7 @@ read_sloop(SHalfloop_handle slh) {
+   in >> index;
+   if(index < 0 || index >= fn)
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   slh->facet() = Halffacet_of[index];
+@@ -2085,7 +2085,7 @@ read_sface(SFace_handle sfh) {
+   in >> index;
+   if(index < 0 || index >= vn)
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   sfh->center_vertex() = Vertex_of[index];
+@@ -2099,7 +2099,7 @@ read_sface(SFace_handle sfh) {
+     SM_decorator SD(&*sfh->center_vertex());
+     if(index < 0 || index >= sen)
+     {
+-      in.clear(std::ios_base::badbit);
++      in.setstate(std::ios_base::badbit);
+       return false;
+     }
+     SD.link_as_face_cycle(SEdge_of[index],sfh);
+@@ -2112,7 +2112,7 @@ read_sface(SFace_handle sfh) {
+     in >> index;
+     if(index < 0 || index >= en)
+     {
+-      in.clear(std::ios_base::badbit);
++      in.setstate(std::ios_base::badbit);
+       return false;
+     }
+     sfh->boundary_entry_objects().push_back(make_object(Edge_of[index]));
+@@ -2126,7 +2126,7 @@ read_sface(SFace_handle sfh) {
+     in >> index;
+     if(index < 0 || index >= sln)
+     {
+-      in.clear(std::ios_base::badbit);
++      in.setstate(std::ios_base::badbit);
+       return false;
+     }
+     sfh->boundary_entry_objects().push_back(make_object(SLoop_of[index]));
+@@ -2137,7 +2137,7 @@ read_sface(SFace_handle sfh) {
+   in >> index;
+   if(index < 0 || index >= vn)
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+   sfh->volume() = Volume_of[index+addInfiBox];
+diff --git a/Nef_S2/include/CGAL/Nef_S2/SM_io_parser.h b/Nef_S2/include/CGAL/Nef_S2/SM_io_parser.h
+index a9377719f93..d58126bac9c 100644
+--- a/Nef_S2/include/CGAL/Nef_S2/SM_io_parser.h
++++ b/Nef_S2/include/CGAL/Nef_S2/SM_io_parser.h
+@@ -205,7 +205,7 @@ bool SM_io_parser<Decorator_>::read_vertex(SVertex_handle v)
+ 
+   if(f<0 || (iso && f > fn) || (!iso && f > en))
+   {
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+ 
+@@ -246,7 +246,7 @@ bool SM_io_parser<Decorator_>::read_edge(SHalfedge_handle e)
+       v >= 0 && v < vn && f >= 0 && f < fn ))
+   {
+     std::cerr<<"wrong index in read_edge"<<std::endl;
+-    in.clear(std::ios_base::badbit);
++    in.setstate(std::ios_base::badbit);
+     return false;
+   }
+ 
+@@ -316,7 +316,7 @@ bool SM_io_parser<Decorator_>::read_face(SFace_handle f)
+     if(!(ei >= 0 && ei < en))
+     {
+       std::cerr<<"wrong index in face cycle list."<<std::endl;
+-      in.clear(std::ios_base::badbit);
++      in.setstate(std::ios_base::badbit);
+       return false;
+     }
+     this->store_sm_boundary_object(Edge_of[ei],f);
+@@ -326,7 +326,7 @@ bool SM_io_parser<Decorator_>::read_face(SFace_handle f)
+     if(!(vi >= 0 && vi < vn))
+     {
+       std::cerr<<"wrong index in iso vertex list."<<std::endl;
+-      in.clear(std::ios_base::badbit);
++      in.setstate(std::ios_base::badbit);
+       return false;
+     }
+     this->store_sm_boundary_object(SVertex_of[vi],f);
+@@ -336,7 +336,7 @@ bool SM_io_parser<Decorator_>::read_face(SFace_handle f)
+     if(!(li >= 0 && li < 2))
+     {
+       std::cerr<<"wrong index in iso vertex list."<<std::endl;
+-      in.clear(std::ios_base::badbit);
++      in.setstate(std::ios_base::badbit);
+       return false;
+     }
+     this->store_sm_boundary_object(Loop_of[li],f);
+
+From ffa019712b0ad3b20e3d02edad4d731fda04a2ef Mon Sep 17 00:00:00 2001
+From: Maxime Gimeno <maxime.gimeno@gmail.com>
+Date: Mon, 25 Jan 2021 12:59:48 +0100
+Subject: [PATCH 5/8] First face may be -1, don't fail on it, just don't use it
+
+---
+ Nef_2/include/CGAL/Nef_2/PM_io_parser.h | 6 +-----
+ 1 file changed, 1 insertion(+), 5 deletions(-)
+
+diff --git a/Nef_2/include/CGAL/Nef_2/PM_io_parser.h b/Nef_2/include/CGAL/Nef_2/PM_io_parser.h
+index 64a3e94916e..d08b08180d6 100644
+--- a/Nef_2/include/CGAL/Nef_2/PM_io_parser.h
++++ b/Nef_2/include/CGAL/Nef_2/PM_io_parser.h
+@@ -280,11 +280,7 @@ bool PM_io_parser<PMDEC>::read_face(Face_handle f)
+   {
+     f->set_halfedge(Halfedge_of[ei]);
+   }
+-  else
+-  {
+-    in.setstate(std::ios_base::badbit);
+-    return false;
+-  }
++
+   while (in >> ei) {
+     CGAL_assertion_msg(ei >= 0 && (std::size_t) ei < en, "wrong index in face cycle list.");
+     if (!(ei >= 0 && ei < en))
+
+From d78842712cdfcbb3bdfc5f7cb252d3772fd6a16f Mon Sep 17 00:00:00 2001
+From: Maxime Gimeno <maxime.gimeno@gmail.com>
+Date: Tue, 26 Jan 2021 09:55:20 +0100
+Subject: [PATCH 6/8] Fix conversion warnigns
+
+---
+ Nef_2/include/CGAL/Nef_2/PM_io_parser.h  |  8 ++++----
+ Nef_3/include/CGAL/Nef_3/SNC_io_parser.h | 18 +++++++++---------
+ 2 files changed, 13 insertions(+), 13 deletions(-)
+
+diff --git a/Nef_2/include/CGAL/Nef_2/PM_io_parser.h b/Nef_2/include/CGAL/Nef_2/PM_io_parser.h
+index d08b08180d6..39b99b37d7c 100644
+--- a/Nef_2/include/CGAL/Nef_2/PM_io_parser.h
++++ b/Nef_2/include/CGAL/Nef_2/PM_io_parser.h
+@@ -200,7 +200,7 @@ bool PM_io_parser<PMDEC>::read_vertex(Vertex_handle v)
+        !(in >> p) ||
+        !check_sep("}") ) return false;
+ 
+-  if(!(f >= 0 && ((iso && f < fn) || (!iso && f < en))))
++  if(!(f >= 0 && ((iso && (std::size_t)f < fn) || (!iso && (std::size_t)f < en))))
+   {
+     in.setstate(std::ios_base::badbit);
+     return false;
+@@ -276,14 +276,14 @@ bool PM_io_parser<PMDEC>::read_face(Face_handle f)
+   int n, ei, vi; Mark m;
+   if ( !(in >> n) || !check_sep("{") ) return false;
+   if ( !(in >> ei) || !check_sep(",") ) return false;
+-  if (ei >= 0 && ei < en)
++  if (ei >= 0 && (std::size_t) ei < en)
+   {
+     f->set_halfedge(Halfedge_of[ei]);
+   }
+ 
+   while (in >> ei) {
+     CGAL_assertion_msg(ei >= 0 && (std::size_t) ei < en, "wrong index in face cycle list.");
+-    if (!(ei >= 0 && ei < en))
++    if (!(ei >= 0 && (std::size_t)ei < en))
+     {
+       in.setstate(std::ios_base::badbit);
+       return false;
+@@ -293,7 +293,7 @@ bool PM_io_parser<PMDEC>::read_face(Face_handle f)
+   if (!check_sep(",")) { return false; }
+   while (in >> vi) {
+     CGAL_assertion_msg(vi >= 0 && (std::size_t) vi < vn, "wrong index in iso vertex list.");
+-    if (!(vi >= 0 && vi < vn))
++    if (!(vi >= 0 && (std::size_t)vi < vn))
+     {
+       in.setstate(std::ios_base::badbit);
+       return false;
+diff --git a/Nef_3/include/CGAL/Nef_3/SNC_io_parser.h b/Nef_3/include/CGAL/Nef_3/SNC_io_parser.h
+index e5530445153..1dde7f8d0b3 100644
+--- a/Nef_3/include/CGAL/Nef_3/SNC_io_parser.h
++++ b/Nef_3/include/CGAL/Nef_3/SNC_io_parser.h
+@@ -1579,7 +1579,7 @@ read_vertex(Vertex_handle vh) {
+   vh->sncp() = this->sncp();
+ 
+   in >> index;
+-  if(index >= int(en))
++  if(index >= (int)en)
+   {
+     in.setstate(std::ios_base::badbit);
+     return false;
+@@ -2016,7 +2016,7 @@ read_sloop(SHalfloop_handle slh) {
+   OK = OK && test_string("{");
+ 
+   in >> index;
+-  if(index < 0 || index >= sln)
++  if(index < 0 || index >= (int)(sln))
+   {
+     in.setstate(std::ios_base::badbit);
+     return false;
+@@ -2024,7 +2024,7 @@ read_sloop(SHalfloop_handle slh) {
+   slh->twin() = SLoop_of[index];
+   OK = OK && test_string(",");
+   in >> index;
+-  if(index < 0 || index >= sfn)
++  if(index < 0 || index >= (int)(sfn))
+   {
+     in.setstate(std::ios_base::badbit);
+     return false;
+@@ -2032,7 +2032,7 @@ read_sloop(SHalfloop_handle slh) {
+   slh->incident_sface() = SFace_of[index];
+   OK = OK && test_string(",");
+   in >> index;
+-  if(index < 0 || index >= fn)
++  if(index < 0 || index >= (int)(fn))
+   {
+     in.setstate(std::ios_base::badbit);
+     return false;
+@@ -2083,7 +2083,7 @@ read_sface(SFace_handle sfh) {
+   OK = OK && test_string("{");
+ 
+   in >> index;
+-  if(index < 0 || index >= vn)
++  if(index < 0 || index >= (int)(sln))
+   {
+     in.setstate(std::ios_base::badbit);
+     return false;
+@@ -2097,7 +2097,7 @@ read_sface(SFace_handle sfh) {
+     in >> index;
+     //    sfh->boundary_entry_objects().push_back(SEdge_of[index]);
+     SM_decorator SD(&*sfh->center_vertex());
+-    if(index < 0 || index >= sen)
++    if(index < 0 || index >= (int)(sln))
+     {
+       in.setstate(std::ios_base::badbit);
+       return false;
+@@ -2110,7 +2110,7 @@ read_sface(SFace_handle sfh) {
+   while(isdigit(cc)) {
+     in.putback(cc);
+     in >> index;
+-    if(index < 0 || index >= en)
++    if(index < 0 || index >= (int)(sln))
+     {
+       in.setstate(std::ios_base::badbit);
+       return false;
+@@ -2124,7 +2124,7 @@ read_sface(SFace_handle sfh) {
+   while(isdigit(cc)) {
+     in.putback(cc);
+     in >> index;
+-    if(index < 0 || index >= sln)
++    if(index < 0 || index >= (int)(sln))
+     {
+       in.setstate(std::ios_base::badbit);
+       return false;
+@@ -2135,7 +2135,7 @@ read_sface(SFace_handle sfh) {
+   }
+ 
+   in >> index;
+-  if(index < 0 || index >= vn)
++  if(index < 0 || index >= (int)(sln))
+   {
+     in.setstate(std::ios_base::badbit);
+     return false;
+
+From 23cc6b0f4a2ac6061b01d86411d58b6da7ff5a34 Mon Sep 17 00:00:00 2001
+From: Maxime Gimeno <maxime.gimeno@gmail.com>
+Date: Wed, 27 Jan 2021 10:04:45 +0100
+Subject: [PATCH 7/8] Fix read_sface
+
+---
+ .../Convex_decomposition_3/check_decomposition.cpp     |  2 ++
+ Nef_3/include/CGAL/Nef_3/SNC_io_parser.h               | 10 +++++-----
+ 2 files changed, 7 insertions(+), 5 deletions(-)
+
+diff --git a/Nef_3/include/CGAL/Nef_3/SNC_io_parser.h b/Nef_3/include/CGAL/Nef_3/SNC_io_parser.h
+index 1dde7f8d0b3..a31a07c5d99 100644
+--- a/Nef_3/include/CGAL/Nef_3/SNC_io_parser.h
++++ b/Nef_3/include/CGAL/Nef_3/SNC_io_parser.h
+@@ -1803,7 +1803,7 @@ read_facet(Halffacet_handle fh) {
+   }
+ 
+   in >> index;
+-  if(index < 0  || index >= int(vn))
++  if(index < 0  || index >= int(cn))
+   {
+     in.setstate(std::ios_base::badbit);
+     return false;
+@@ -2083,7 +2083,7 @@ read_sface(SFace_handle sfh) {
+   OK = OK && test_string("{");
+ 
+   in >> index;
+-  if(index < 0 || index >= (int)(sln))
++  if(index < 0 || index >= (int)(vn))
+   {
+     in.setstate(std::ios_base::badbit);
+     return false;
+@@ -2097,7 +2097,7 @@ read_sface(SFace_handle sfh) {
+     in >> index;
+     //    sfh->boundary_entry_objects().push_back(SEdge_of[index]);
+     SM_decorator SD(&*sfh->center_vertex());
+-    if(index < 0 || index >= (int)(sln))
++    if(index < 0 || index >= (int)(sen))
+     {
+       in.setstate(std::ios_base::badbit);
+       return false;
+@@ -2110,7 +2110,7 @@ read_sface(SFace_handle sfh) {
+   while(isdigit(cc)) {
+     in.putback(cc);
+     in >> index;
+-    if(index < 0 || index >= (int)(sln))
++    if(index < 0 || index >= (int)(en))
+     {
+       in.setstate(std::ios_base::badbit);
+       return false;
+@@ -2135,7 +2135,7 @@ read_sface(SFace_handle sfh) {
+   }
+ 
+   in >> index;
+-  if(index < 0 || index >= (int)(sln))
++  if(index < 0 || index >= (int)(cn))
+   {
+     in.setstate(std::ios_base::badbit);
+     return false;
+