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diff --git a/src/mesh/assimp-master/include/assimp/IOStreamBuffer.h b/src/mesh/assimp-master/include/assimp/IOStreamBuffer.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.
+
+----------------------------------------------------------------------
+*/
+
+#pragma once
+#ifndef AI_IOSTREAMBUFFER_H_INC
+#define AI_IOSTREAMBUFFER_H_INC
+
+#ifdef __GNUC__
+#pragma GCC system_header
+#endif
+
+#include <assimp/ParsingUtils.h>
+#include <assimp/types.h>
+#include <assimp/IOStream.hpp>
+
+#include <vector>
+
+namespace Assimp {
+
+// ---------------------------------------------------------------------------
+/**
+ *  Implementation of a cached stream buffer.
+ */
+template <class T>
+class IOStreamBuffer {
+public:
+    /// @brief  The class constructor.
+    IOStreamBuffer(size_t cache = 4096 * 4096);
+
+    /// @brief  The class destructor.
+    ~IOStreamBuffer();
+
+    /// @brief  Will open the cached access for a given stream.
+    /// @param  stream      The stream to cache.
+    /// @return true if successful.
+    bool open(IOStream *stream);
+
+    /// @brief  Will close the cached access.
+    /// @return true if successful.
+    bool close();
+
+    /// @brief  Returns the file-size.
+    /// @return The file-size.
+    size_t size() const;
+
+    /// @brief  Returns the cache size.
+    /// @return The cache size.
+    size_t cacheSize() const;
+
+    /// @brief  Will read the next block.
+    /// @return true if successful.
+    bool readNextBlock();
+
+    /// @brief  Returns the number of blocks to read.
+    /// @return The number of blocks.
+    size_t getNumBlocks() const;
+
+    /// @brief  Returns the current block index.
+    /// @return The current block index.
+    size_t getCurrentBlockIndex() const;
+
+    /// @brief  Returns the current file pos.
+    /// @return The current file pos.
+    size_t getFilePos() const;
+
+    /// @brief  Will read the next line.
+    /// @param  buffer      The buffer for the next line.
+    /// @return true if successful.
+    bool getNextDataLine(std::vector<T> &buffer, T continuationToken);
+
+    /// @brief  Will read the next line ascii or binary end line char.
+    /// @param  buffer      The buffer for the next line.
+    /// @return true if successful.
+    bool getNextLine(std::vector<T> &buffer);
+
+    /// @brief  Will read the next block.
+    /// @param  buffer      The buffer for the next block.
+    /// @return true if successful.
+    bool getNextBlock(std::vector<T> &buffer);
+
+private:
+    IOStream *m_stream;
+    size_t m_filesize;
+    size_t m_cacheSize;
+    size_t m_numBlocks;
+    size_t m_blockIdx;
+    std::vector<T> m_cache;
+    size_t m_cachePos;
+    size_t m_filePos;
+};
+
+template <class T>
+AI_FORCE_INLINE IOStreamBuffer<T>::IOStreamBuffer(size_t cache) :
+        m_stream(nullptr),
+        m_filesize(0),
+        m_cacheSize(cache),
+        m_numBlocks(0),
+        m_blockIdx(0),
+        m_cachePos(0),
+        m_filePos(0) {
+    m_cache.resize(cache);
+    std::fill(m_cache.begin(), m_cache.end(), '\n');
+}
+
+template <class T>
+AI_FORCE_INLINE IOStreamBuffer<T>::~IOStreamBuffer() {
+    // empty
+}
+
+template <class T>
+AI_FORCE_INLINE bool IOStreamBuffer<T>::open(IOStream *stream) {
+    //  file still opened!
+    if (nullptr != m_stream) {
+        return false;
+    }
+
+    //  Invalid stream pointer
+    if (nullptr == stream) {
+        return false;
+    }
+
+    m_stream = stream;
+    m_filesize = m_stream->FileSize();
+    if (m_filesize == 0) {
+        return false;
+    }
+    if (m_filesize < m_cacheSize) {
+        m_cacheSize = m_filesize;
+    }
+
+    m_numBlocks = m_filesize / m_cacheSize;
+    if ((m_filesize % m_cacheSize) > 0) {
+        m_numBlocks++;
+    }
+
+    return true;
+}
+
+template <class T>
+AI_FORCE_INLINE bool IOStreamBuffer<T>::close() {
+    if (nullptr == m_stream) {
+        return false;
+    }
+
+    // init counters and state vars
+    m_stream = nullptr;
+    m_filesize = 0;
+    m_numBlocks = 0;
+    m_blockIdx = 0;
+    m_cachePos = 0;
+    m_filePos = 0;
+
+    return true;
+}
+
+template <class T>
+AI_FORCE_INLINE
+        size_t
+        IOStreamBuffer<T>::size() const {
+    return m_filesize;
+}
+
+template <class T>
+AI_FORCE_INLINE
+        size_t
+        IOStreamBuffer<T>::cacheSize() const {
+    return m_cacheSize;
+}
+
+template <class T>
+AI_FORCE_INLINE bool IOStreamBuffer<T>::readNextBlock() {
+    m_stream->Seek(m_filePos, aiOrigin_SET);
+    size_t readLen = m_stream->Read(&m_cache[0], sizeof(T), m_cacheSize);
+    if (readLen == 0) {
+        return false;
+    }
+    if (readLen < m_cacheSize) {
+        m_cacheSize = readLen;
+    }
+    m_filePos += m_cacheSize;
+    m_cachePos = 0;
+    m_blockIdx++;
+
+    return true;
+}
+
+template <class T>
+AI_FORCE_INLINE size_t IOStreamBuffer<T>::getNumBlocks() const {
+    return m_numBlocks;
+}
+
+template <class T>
+AI_FORCE_INLINE size_t IOStreamBuffer<T>::getCurrentBlockIndex() const {
+    return m_blockIdx;
+}
+
+template <class T>
+AI_FORCE_INLINE size_t IOStreamBuffer<T>::getFilePos() const {
+    return m_filePos;
+}
+
+template <class T>
+AI_FORCE_INLINE bool IOStreamBuffer<T>::getNextDataLine(std::vector<T> &buffer, T continuationToken) {
+    buffer.resize(m_cacheSize);
+    if (m_cachePos >= m_cacheSize || 0 == m_filePos) {
+        if (!readNextBlock()) {
+            return false;
+        }
+    }
+
+    size_t i = 0;
+    for (;;) {
+        if (continuationToken == m_cache[m_cachePos] && IsLineEnd(m_cache[m_cachePos + 1])) {
+            ++m_cachePos;
+            while (m_cache[m_cachePos] != '\n') {
+                ++m_cachePos;
+            }
+            ++m_cachePos;
+        } else if (IsLineEnd(m_cache[m_cachePos])) {
+            break;
+        }
+
+        buffer[i] = m_cache[m_cachePos];
+        ++m_cachePos;
+        ++i;
+
+        if(i == buffer.size()) {
+            buffer.resize(buffer.size() * 2);
+        }
+
+        if (m_cachePos >= size()) {
+            break;
+        }
+        if (m_cachePos >= m_cacheSize) {
+            if (!readNextBlock()) {
+                return false;
+            }
+        }
+    }
+
+    buffer[i] = '\n';
+    ++m_cachePos;
+
+    return true;
+}
+
+static AI_FORCE_INLINE bool isEndOfCache(size_t pos, size_t cacheSize) {
+    return (pos == cacheSize);
+}
+
+template <class T>
+AI_FORCE_INLINE bool IOStreamBuffer<T>::getNextLine(std::vector<T> &buffer) {
+    buffer.resize(m_cacheSize);
+    if (isEndOfCache(m_cachePos, m_cacheSize) || 0 == m_filePos) {
+        if (!readNextBlock()) {
+            return false;
+        }
+    }
+
+    if (IsLineEnd(m_cache[m_cachePos])) {
+        // skip line end
+        while (m_cache[m_cachePos] != '\n') {
+            ++m_cachePos;
+        }
+        ++m_cachePos;
+        if (isEndOfCache(m_cachePos, m_cacheSize)) {
+            if (!readNextBlock()) {
+                return false;
+            }
+        }
+    }
+
+    size_t i(0);
+    while (!IsLineEnd(m_cache[m_cachePos])) {
+        buffer[i] = m_cache[m_cachePos];
+        ++m_cachePos;
+        ++i;
+
+        if(i == buffer.size()) {
+            buffer.resize(buffer.size() * 2);
+        }
+
+        if (m_cachePos >= m_cacheSize) {
+            if (!readNextBlock()) {
+                return false;
+            }
+        }
+    }
+    buffer[i] = '\n';
+    ++m_cachePos;
+
+    return true;
+}
+
+template <class T>
+AI_FORCE_INLINE bool IOStreamBuffer<T>::getNextBlock(std::vector<T> &buffer) {
+    // Return the last block-value if getNextLine was used before
+    if (0 != m_cachePos) {
+        buffer = std::vector<T>(m_cache.begin() + m_cachePos, m_cache.end());
+        m_cachePos = 0;
+    } else {
+        if (!readNextBlock()) {
+            return false;
+        }
+
+        buffer = std::vector<T>(m_cache.begin(), m_cache.end());
+    }
+
+    return true;
+}
+
+} // namespace Assimp
+
+#endif // AI_IOSTREAMBUFFER_H_INC