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diff --git a/libs/assimp/code/AssetLib/MD4/MD4FileData.h b/libs/assimp/code/AssetLib/MD4/MD4FileData.h
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+/*
+Open Asset Import Library (ASSIMP)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2020, ASSIMP Development Team
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the
+following conditions are met:
+
+* Redistributions of source code must retain the above
+ copyright notice, this list of conditions and the
+ following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+ copyright notice, this list of conditions and the
+ following disclaimer in the documentation and/or other
+ materials provided with the distribution.
+
+* Neither the name of the ASSIMP team, nor the names of its
+ contributors may be used to endorse or promote products
+ derived from this software without specific prior
+ written permission of the ASSIMP Development Team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+----------------------------------------------------------------------
+*/
+
+/** @file Defines the helper data structures for importing MD4 files */
+#ifndef AI_MD4FILEHELPER_H_INC
+#define AI_MD4FILEHELPER_H_INC
+
+#include <string>
+#include <vector>
+#include <sstream>
+
+#include <assimp/types.h>
+#include <assimp/mesh.h>
+#include <assimp/anim.h>
+
+#if defined(_MSC_VER) || defined(__BORLANDC__) || defined (__BCPLUSPLUS__)
+# pragma pack(push,1)
+# define PACK_STRUCT
+#elif defined( __GNUC__ )
+# define PACK_STRUCT __attribute__((packed))
+#else
+# error Compiler not supported
+#endif
+
+
+namespace Assimp
+{
+// http://gongo.quakedev.com/md4.html
+namespace MD4
+{
+
+#define AI_MD4_MAGIC_NUMBER_BE 'IDP4'
+#define AI_MD4_MAGIC_NUMBER_LE '4PDI'
+
+// common limitations
+#define AI_MD4_VERSION 4
+#define AI_MD4_MAXQPATH 64
+#define AI_MD4_MAX_FRAMES 2028
+#define AI_MD4_MAX_SURFACES 32
+#define AI_MD4_MAX_BONES 256
+#define AI_MD4_MAX_VERTS 4096
+#define AI_MD4_MAX_TRIANGLES 8192
+
+// ---------------------------------------------------------------------------
+/** \brief Data structure for the MD4 main header
+ */
+// ---------------------------------------------------------------------------
+struct Header
+{
+ //! magic number
+ int32_t magic;
+
+ //! file format version
+ int32_t version;
+
+ //! original name in .pak archive
+ unsigned char name[ AI_MD4_MAXQPATH ];
+
+ //! number of frames in the file
+ int32_t NUM_FRAMES;
+
+ //! number of bones in the file
+ int32_t NUM_BONES;
+
+ //! number of surfaces in the file
+ int32_t NUM_SURFACES;
+
+ //! offset of the first frame
+ int32_t OFS_FRAMES;
+
+ //! offset of the first bone
+ int32_t OFS_BONES;
+
+ //! offset of the first surface
+ int32_t OFS_SURFACES;
+
+ //! end of file
+ int32_t OFS_EOF;
+} PACK_STRUCT;
+
+// ---------------------------------------------------------------------------
+/** \brief Stores the local transformation matrix of a bone
+ */
+// ---------------------------------------------------------------------------
+struct BoneFrame
+{
+ float matrix[3][4];
+} PACK_STRUCT;
+
+// ---------------------------------------------------------------------------
+/** \brief Stores the name / parent index / flag of a node
+ */
+// ---------------------------------------------------------------------------
+struct BoneName
+{
+ char name[32] ;
+ int parent ;
+ int flags ;
+} PACK_STRUCT;
+
+// ---------------------------------------------------------------------------
+/** \brief Data structure for a surface in a MD4 file
+ */
+// ---------------------------------------------------------------------------
+struct Surface
+{
+ int32_t ident;
+ char name[64];
+ char shader[64];
+ int32_t shaderIndex;
+ int32_t lodBias;
+ int32_t minLod;
+ int32_t ofsHeader;
+ int32_t numVerts;
+ int32_t ofsVerts;
+ int32_t numTris;
+ int32_t ofsTris;
+ int32_t numBoneRefs;
+ int32_t ofsBoneRefs;
+ int32_t ofsCollapseMap;
+ int32_t ofsEnd;
+} PACK_STRUCT;
+
+
+// ---------------------------------------------------------------------------
+/** \brief Data structure for a MD4 vertex' weight
+ */
+// ---------------------------------------------------------------------------
+struct Weight
+{
+ int32_t boneIndex;
+ float boneWeight;
+ float offset[3];
+} PACK_STRUCT;
+
+// ---------------------------------------------------------------------------
+/** \brief Data structure for a vertex in a MD4 file
+ */
+// ---------------------------------------------------------------------------
+struct Vertex
+{
+ float vertex[3];
+ float normal[3];
+ float texCoords[2];
+ int32_t numWeights;
+ Weight weights[1];
+} PACK_STRUCT;
+
+// ---------------------------------------------------------------------------
+/** \brief Data structure for a triangle in a MD4 file
+ */
+// ---------------------------------------------------------------------------
+struct Triangle
+{
+ int32_t indexes[3];
+} PACK_STRUCT;
+
+// ---------------------------------------------------------------------------
+/** \brief Data structure for a MD4 frame
+ */
+// ---------------------------------------------------------------------------
+struct Frame
+{
+ float bounds[3][2];
+ float localOrigin[3];
+ float radius;
+ BoneFrame bones[1];
+} PACK_STRUCT;
+
+
+// reset packing to the original value
+#if defined(_MSC_VER) || defined(__BORLANDC__) || defined (__BCPLUSPLUS__)
+# pragma pack( pop )
+#endif
+#undef PACK_STRUCT
+
+
+};
+};
+
+#endif // !! AI_MD4FILEHELPER_H_INC