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diff --git a/src/mesh/assimp-master/code/AssetLib/FBX/FBXUtil.h b/src/mesh/assimp-master/code/AssetLib/FBX/FBXUtil.h
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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  FBXUtil.h
+ *  @brief FBX utility functions for internal use
+ */
+#ifndef INCLUDED_AI_FBX_UTIL_H
+#define INCLUDED_AI_FBX_UTIL_H
+
+#include "FBXCompileConfig.h"
+#include "FBXTokenizer.h"
+#include <stdint.h>
+
+namespace Assimp {
+namespace FBX {
+
+
+namespace Util {
+
+
+/** helper for std::for_each to delete all heap-allocated items in a container */
+template<typename T>
+struct delete_fun
+{
+    void operator()(const volatile T* del) {
+        delete del;
+    }
+};
+
+/** Get a string representation for a #TokenType. */
+const char* TokenTypeString(TokenType t);
+
+
+
+/** Format log/error messages using a given offset in the source binary file
+ *
+ *  @param offset offset within the file
+ *  @return A string of the following format: " (offset 0x{offset}) "*/
+std::string GetOffsetText(size_t offset);
+
+
+/** Format log/error messages using a given line location in the source file.
+ *
+ *  @param line Line index, 1-based
+ *  @param column Column index, 1-based
+ *  @return A string of the following format: " (line {line}, col {column}) "*/
+std::string GetLineAndColumnText(unsigned int line, unsigned int column);
+
+
+/** Format log/error messages using a given cursor token.
+ *
+ *  @param tok Token where parsing/processing stopped
+ *  @return A string of the following format: " ({token-type}, line {line}, col {column}) "*/
+std::string GetTokenText(const Token* tok);
+
+/** Decode a single Base64-encoded character.
+*
+*  @param ch Character to decode (from base64 to binary).
+*  @return decoded byte value*/
+uint8_t DecodeBase64(char ch);
+
+/** Compute decoded size of a Base64-encoded string
+*
+*  @param in Characters to decode.
+*  @param inLength Number of characters to decode.
+*  @return size of the decoded data (number of bytes)*/
+size_t ComputeDecodedSizeBase64(const char* in, size_t inLength);
+
+/** Decode a Base64-encoded string
+*
+*  @param in Characters to decode.
+*  @param inLength Number of characters to decode.
+*  @param out Pointer where we will store the decoded data.
+*  @param maxOutLength Size of output buffer.
+*  @return size of the decoded data (number of bytes)*/
+size_t DecodeBase64(const char* in, size_t inLength, uint8_t* out, size_t maxOutLength);
+
+char EncodeBase64(char byte);
+
+/** Encode bytes in base64-encoding
+*
+*  @param data Binary data to encode.
+*  @param inLength Number of bytes to encode.
+*  @return base64-encoded string*/
+std::string EncodeBase64(const char* data, size_t length);
+
+}
+}
+}
+
+#endif // ! INCLUDED_AI_FBX_UTIL_H