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diff --git a/source/blender/io/collada/SkinInfo.h b/source/blender/io/collada/SkinInfo.h
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+++ b/source/blender/io/collada/SkinInfo.h
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+/*
+ * 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 the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+/** \file
+ * \ingroup collada
+ */
+
+#ifndef __SKININFO_H__
+#define __SKININFO_H__
+
+#include <map>
+#include <vector>
+
+#include "COLLADAFWUniqueId.h"
+#include "COLLADAFWTypes.h"
+#include "COLLADAFWNode.h"
+#include "COLLADAFWSkinController.h"
+#include "COLLADAFWSkinControllerData.h"
+
+#include "DNA_object_types.h"
+#include "BKE_context.h"
+
+#include "TransformReader.h"
+#include "collada_internal.h"
+
+// This is used to store data passed in write_controller_data.
+// Arrays from COLLADAFW::SkinControllerData lose ownership, so do this class members
+// so that arrays don't get freed until we free them explicitly.
+class SkinInfo {
+ private:
+  // to build armature bones from inverse bind matrices
+  struct JointData {
+    float inv_bind_mat[4][4];       // joint inverse bind matrix
+    COLLADAFW::UniqueId joint_uid;  // joint node UID
+    // Object *ob_arm;            // armature object
+  };
+
+  float bind_shape_matrix[4][4];
+
+  // data from COLLADAFW::SkinControllerData, each array should be freed
+  COLLADAFW::UIntValuesArray joints_per_vertex;
+  COLLADAFW::UIntValuesArray weight_indices;
+  COLLADAFW::IntValuesArray joint_indices;
+  // COLLADAFW::FloatOrDoubleArray weights;
+  std::vector<float> weights;
+
+  std::vector<JointData> joint_data;  // index to this vector is joint index
+
+  UnitConverter *unit_converter;
+
+  Object *ob_arm;
+  COLLADAFW::UniqueId controller_uid;
+  Object *parent;
+
+ public:
+  SkinInfo();
+  SkinInfo(const SkinInfo &skin);
+  SkinInfo(UnitConverter *conv);
+
+  // nobody owns the data after this, so it should be freed manually with releaseMemory
+  template<typename T> void transfer_array_data(T &src, T &dest);
+
+  // when src is const we cannot src.yieldOwnerShip, this is used by copy constructor
+  void transfer_int_array_data_const(const COLLADAFW::IntValuesArray &src,
+                                     COLLADAFW::IntValuesArray &dest);
+
+  void transfer_uint_array_data_const(const COLLADAFW::UIntValuesArray &src,
+                                      COLLADAFW::UIntValuesArray &dest);
+
+  void borrow_skin_controller_data(const COLLADAFW::SkinControllerData *skin);
+
+  void free();
+
+  // using inverse bind matrices to construct armature
+  // it is safe to invert them to get the original matrices
+  // because if they are inverse matrices, they can be inverted
+  void add_joint(const COLLADABU::Math::Matrix4 &matrix);
+
+  void set_controller(const COLLADAFW::SkinController *co);
+
+  // called from write_controller
+  Object *create_armature(Main *bmain, Scene *scene, ViewLayer *view_layer);
+
+  Object *set_armature(Object *ob_arm);
+
+  bool get_joint_inv_bind_matrix(float inv_bind_mat[4][4], COLLADAFW::Node *node);
+
+  Object *BKE_armature_from_object();
+
+  const COLLADAFW::UniqueId &get_controller_uid();
+
+  // check if this skin controller references a joint or any descendant of it
+  //
+  // some nodes may not be referenced by SkinController,
+  // in this case to determine if the node belongs to this armature,
+  // we need to search down the tree
+  bool uses_joint_or_descendant(COLLADAFW::Node *node);
+
+  void link_armature(bContext *C,
+                     Object *ob,
+                     std::map<COLLADAFW::UniqueId, COLLADAFW::Node *> &joint_by_uid,
+                     TransformReader *tm);
+
+  bPoseChannel *get_pose_channel_from_node(COLLADAFW::Node *node);
+
+  void set_parent(Object *_parent);
+
+  Object *get_parent();
+
+  void find_root_joints(const std::vector<COLLADAFW::Node *> &root_joints,
+                        std::map<COLLADAFW::UniqueId, COLLADAFW::Node *> &joint_by_uid,
+                        std::vector<COLLADAFW::Node *> &result);
+
+  bool find_node_in_tree(COLLADAFW::Node *node, COLLADAFW::Node *tree_root);
+};
+
+#endif