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diff --git a/src/mesh/assimp-master/include/assimp/IOStream.hpp b/src/mesh/assimp-master/include/assimp/IOStream.hpp
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+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2022, assimp 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 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 IOStream.hpp
+ *  @brief File I/O wrappers for C++.
+ */
+
+#pragma once
+#ifndef AI_IOSTREAM_H_INC
+#define AI_IOSTREAM_H_INC
+
+#ifdef __GNUC__
+#   pragma GCC system_header
+#endif
+
+#include <assimp/types.h>
+
+#ifndef __cplusplus
+#   error This header requires C++ to be used. aiFileIO.h is the \
+    corresponding C interface.
+#endif
+
+namespace Assimp {
+
+// ----------------------------------------------------------------------------------
+/** @brief CPP-API: Class to handle file I/O for C++
+ *
+ *  Derive an own implementation from this interface to provide custom IO handling
+ *  to the Importer. If you implement this interface, be sure to also provide an
+ *  implementation for IOSystem that creates instances of your custom IO class.
+*/
+class ASSIMP_API IOStream
+#ifndef SWIG
+    : public Intern::AllocateFromAssimpHeap
+#endif
+{
+protected:
+    /** Constructor protected, use IOSystem::Open() to create an instance. */
+    IOStream() AI_NO_EXCEPT;
+
+public:
+    // -------------------------------------------------------------------
+    /** @brief Destructor. Deleting the object closes the underlying file,
+     * alternatively you may use IOSystem::Close() to release the file.
+     */
+    virtual ~IOStream();
+
+    // -------------------------------------------------------------------
+    /** @brief Read from the file
+     *
+     * See fread() for more details
+     * This fails for write-only files */
+    virtual size_t Read(void* pvBuffer,
+        size_t pSize,
+        size_t pCount) = 0;
+
+    // -------------------------------------------------------------------
+    /** @brief Write to the file
+    *
+    * See fwrite() for more details
+    * This fails for read-only files */
+    virtual size_t Write(const void* pvBuffer,
+        size_t pSize,
+        size_t pCount) = 0;
+
+    // -------------------------------------------------------------------
+    /** @brief Set the read/write cursor of the file
+     *
+     * Note that the offset is _negative_ for aiOrigin_END.
+     * See fseek() for more details */
+    virtual aiReturn Seek(size_t pOffset,
+        aiOrigin pOrigin) = 0;
+
+    // -------------------------------------------------------------------
+    /** @brief Get the current position of the read/write cursor
+     *
+     * See ftell() for more details */
+    virtual size_t Tell() const = 0;
+
+    // -------------------------------------------------------------------
+    /** @brief Returns filesize
+     *  Returns the filesize. */
+    virtual size_t FileSize() const = 0;
+
+    // -------------------------------------------------------------------
+    /** @brief Flush the contents of the file buffer (for writers)
+     *  See fflush() for more details.
+     */
+    virtual void Flush() = 0;
+}; //! class IOStream
+
+// ----------------------------------------------------------------------------------
+AI_FORCE_INLINE
+IOStream::IOStream() AI_NO_EXCEPT {
+    // empty
+}
+
+// ----------------------------------------------------------------------------------
+AI_FORCE_INLINE
+IOStream::~IOStream() {
+    // empty
+}
+// ----------------------------------------------------------------------------------
+
+} //!namespace Assimp
+
+#endif //!!AI_IOSTREAM_H_INC