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diff --git a/src/mesh/assimp-master/code/AssetLib/FBX/FBXTokenizer.h b/src/mesh/assimp-master/code/AssetLib/FBX/FBXTokenizer.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  FBXTokenizer.h
+ *  @brief FBX lexer
+ */
+#ifndef INCLUDED_AI_FBX_TOKENIZER_H
+#define INCLUDED_AI_FBX_TOKENIZER_H
+
+#include "FBXCompileConfig.h"
+#include <assimp/ai_assert.h>
+#include <assimp/defs.h>
+#include <vector>
+#include <string>
+
+namespace Assimp {
+namespace FBX {
+
+/** Rough classification for text FBX tokens used for constructing the
+ *  basic scope hierarchy. */
+enum TokenType
+{
+    // {
+    TokenType_OPEN_BRACKET = 0,
+
+    // }
+    TokenType_CLOSE_BRACKET,
+
+    // '"blablubb"', '2', '*14' - very general token class,
+    // further processing happens at a later stage.
+    TokenType_DATA,
+
+    //
+    TokenType_BINARY_DATA,
+
+    // ,
+    TokenType_COMMA,
+
+    // blubb:
+    TokenType_KEY
+};
+
+
+/** Represents a single token in a FBX file. Tokens are
+ *  classified by the #TokenType enumerated types.
+ *
+ *  Offers iterator protocol. Tokens are immutable. */
+class Token
+{
+private:
+    static const unsigned int BINARY_MARKER = static_cast<unsigned int>(-1);
+
+public:
+    /** construct a textual token */
+    Token(const char* sbegin, const char* send, TokenType type, unsigned int line, unsigned int column);
+
+    /** construct a binary token */
+    Token(const char* sbegin, const char* send, TokenType type, size_t offset);
+
+    ~Token();
+
+public:
+    std::string StringContents() const {
+        return std::string(begin(),end());
+    }
+
+    bool IsBinary() const {
+        return column == BINARY_MARKER;
+    }
+
+    const char* begin() const {
+        return sbegin;
+    }
+
+    const char* end() const {
+        return send;
+    }
+
+    TokenType Type() const {
+        return type;
+    }
+
+    size_t Offset() const {
+        ai_assert(IsBinary());
+        return offset;
+    }
+
+    unsigned int Line() const {
+        ai_assert(!IsBinary());
+        return static_cast<unsigned int>(line);
+    }
+
+    unsigned int Column() const {
+        ai_assert(!IsBinary());
+        return column;
+    }
+
+private:
+
+#ifdef DEBUG
+    // full string copy for the sole purpose that it nicely appears
+    // in msvc's debugger window.
+    const std::string contents;
+#endif
+
+
+    const char* const sbegin;
+    const char* const send;
+    const TokenType type;
+
+    union {
+        size_t line;
+        size_t offset;
+    };
+    const unsigned int column;
+};
+
+// XXX should use C++11's unique_ptr - but assimp's need to keep working with 03
+typedef const Token* TokenPtr;
+typedef std::vector< TokenPtr > TokenList;
+
+#define new_Token new Token
+
+
+/** Main FBX tokenizer function. Transform input buffer into a list of preprocessed tokens.
+ *
+ *  Skips over comments and generates line and column numbers.
+ *
+ * @param output_tokens Receives a list of all tokens in the input data.
+ * @param input_buffer Textual input buffer to be processed, 0-terminated.
+ * @throw DeadlyImportError if something goes wrong */
+void Tokenize(TokenList& output_tokens, const char* input);
+
+
+/** Tokenizer function for binary FBX files.
+ *
+ *  Emits a token list suitable for direct parsing.
+ *
+ * @param output_tokens Receives a list of all tokens in the input data.
+ * @param input_buffer Binary input buffer to be processed.
+ * @param length Length of input buffer, in bytes. There is no 0-terminal.
+ * @throw DeadlyImportError if something goes wrong */
+void TokenizeBinary(TokenList& output_tokens, const char* input, size_t length);
+
+
+} // ! FBX
+} // ! Assimp
+
+#endif // ! INCLUDED_AI_FBX_PARSER_H