move 3rd-party librarys into libs/ and add built-in honeysuckle

1 files changed, 808 insertions, 0 deletions

diff --git a/libs/assimp/code/AssetLib/Blender/BlenderDNA.h b/libs/assimp/code/AssetLib/Blender/BlenderDNA.h
new file mode 100644
index 0000000..b2158f2
--- /dev/null
+++ b/libs/assimp/code/AssetLib/Blender/BlenderDNA.h
@@ -0,0 +1,808 @@
+/*
+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  BlenderDNA.h
+ *  @brief Blender `DNA` (file format specification embedded in
+ *    blend file itself) loader.
+ */
+#ifndef INCLUDED_AI_BLEND_DNA_H
+#define INCLUDED_AI_BLEND_DNA_H
+
+#include <assimp/BaseImporter.h>
+#include <assimp/StreamReader.h>
+#include <stdint.h>
+#include <assimp/DefaultLogger.hpp>
+#include <map>
+#include <memory>
+
+// enable verbose log output. really verbose, so be careful.
+#ifdef ASSIMP_BUILD_DEBUG
+#define ASSIMP_BUILD_BLENDER_DEBUG
+#endif
+
+// set this to non-zero to dump BlenderDNA stuff to dna.txt.
+// you could set it on the assimp build command line too without touching it here.
+// !!! please make sure this is set to 0 in the repo !!!
+#ifndef ASSIMP_BUILD_BLENDER_DEBUG_DNA
+#define ASSIMP_BUILD_BLENDER_DEBUG_DNA 0
+#endif
+
+// #define ASSIMP_BUILD_BLENDER_NO_STATS
+
+namespace Assimp {
+
+template <bool, bool>
+class StreamReader;
+typedef StreamReader<true, true> StreamReaderAny;
+
+namespace Blender {
+
+class FileDatabase;
+struct FileBlockHead;
+
+template <template <typename> class TOUT>
+class ObjectCache;
+
+// -------------------------------------------------------------------------------
+/** Exception class used by the blender loader to selectively catch exceptions
+ *  thrown in its own code (DeadlyImportErrors thrown in general utility
+ *  functions are untouched then). If such an exception is not caught by
+ *  the loader itself, it will still be caught by Assimp due to its
+ *  ancestry. */
+// -------------------------------------------------------------------------------
+struct Error : DeadlyImportError {
+    template <typename... T>
+    explicit Error(T &&...args) :
+            DeadlyImportError(args...) {
+    }
+};
+
+// -------------------------------------------------------------------------------
+/** The only purpose of this structure is to feed a virtual dtor into its
+ *  descendents. It serves as base class for all data structure fields. */
+// -------------------------------------------------------------------------------
+struct ElemBase {
+    ElemBase() :
+            dna_type(nullptr) {
+        // empty
+    }
+
+    virtual ~ElemBase() {
+        // empty
+    }
+
+    /** Type name of the element. The type
+     * string points is the `c_str` of the `name` attribute of the
+     * corresponding `Structure`, that is, it is only valid as long
+     * as the DNA is not modified. The dna_type is only set if the
+     * data type is not static, i.e. a std::shared_ptr<ElemBase>
+     * in the scene description would have its type resolved
+     * at runtime, so this member is always set. */
+    const char *dna_type;
+};
+
+// -------------------------------------------------------------------------------
+/** Represents a generic pointer to a memory location, which can be either 32
+ *  or 64 bits. These pointers are loaded from the BLEND file and finally
+ *  fixed to point to the real, converted representation of the objects
+ *  they used to point to.*/
+// -------------------------------------------------------------------------------
+struct Pointer {
+    Pointer() :
+            val() {
+        // empty
+    }
+    uint64_t val;
+};
+
+// -------------------------------------------------------------------------------
+/** Represents a generic offset within a BLEND file */
+// -------------------------------------------------------------------------------
+struct FileOffset {
+    FileOffset() :
+            val() {
+        // empty
+    }
+    uint64_t val;
+};
+
+// -------------------------------------------------------------------------------
+/** Dummy derivate of std::vector to be able to use it in templates simultaenously
+ *  with std::shared_ptr, which takes only one template argument
+ *  while std::vector takes three. Also we need to provide some special member
+ *  functions of shared_ptr */
+// -------------------------------------------------------------------------------
+template <typename T>
+class vector : public std::vector<T> {
+public:
+    using std::vector<T>::resize;
+    using std::vector<T>::empty;
+
+    void reset() {
+        resize(0);
+    }
+
+    operator bool() const {
+        return !empty();
+    }
+};
+
+// -------------------------------------------------------------------------------
+/** Mixed flags for use in #Field */
+// -------------------------------------------------------------------------------
+enum FieldFlags {
+    FieldFlag_Pointer = 0x1,
+    FieldFlag_Array = 0x2
+};
+
+// -------------------------------------------------------------------------------
+/** Represents a single member of a data structure in a BLEND file */
+// -------------------------------------------------------------------------------
+struct Field {
+    std::string name;
+    std::string type;
+
+    size_t size;
+    size_t offset;
+
+    /** Size of each array dimension. For flat arrays,
+     *  the second dimension is set to 1. */
+    size_t array_sizes[2];
+
+    /** Any of the #FieldFlags enumerated values */
+    unsigned int flags;
+};
+
+// -------------------------------------------------------------------------------
+/** Range of possible behaviors for fields absence in the input file. Some are
+ *  mission critical so we need them, while others can silently be default
+ *  initialized and no animations are harmed. */
+// -------------------------------------------------------------------------------
+enum ErrorPolicy {
+    /** Substitute default value and ignore */
+    ErrorPolicy_Igno,
+    /** Substitute default value and write to log */
+    ErrorPolicy_Warn,
+    /** Substitute a massive error message and crash the whole matrix. Its time for another zion */
+    ErrorPolicy_Fail
+};
+
+#ifdef ASSIMP_BUILD_BLENDER_DEBUG
+#define ErrorPolicy_Igno ErrorPolicy_Warn
+#endif
+
+// -------------------------------------------------------------------------------
+/** Represents a data structure in a BLEND file. A Structure defines n fields
+ *  and their locations and encodings the input stream. Usually, every
+ *  Structure instance pertains to one equally-named data structure in the
+ *  BlenderScene.h header. This class defines various utilities to map a
+ *  binary `blob` read from the file to such a structure instance with
+ *  meaningful contents. */
+// -------------------------------------------------------------------------------
+class Structure {
+    template <template <typename> class>
+    friend class ObjectCache;
+
+public:
+    Structure() :
+            cache_idx(static_cast<size_t>(-1)) {
+        // empty
+    }
+
+    // publicly accessible members
+    std::string name;
+    vector<Field> fields;
+    std::map<std::string, size_t> indices;
+
+    size_t size;
+
+    // --------------------------------------------------------
+    /** Access a field of the structure by its canonical name. The pointer version
+     *  returns nullptr on failure while the reference version raises an import error. */
+    inline const Field &operator[](const std::string &ss) const;
+    inline const Field *Get(const std::string &ss) const;
+
+    // --------------------------------------------------------
+    /** Access a field of the structure by its index */
+    inline const Field &operator[](const size_t i) const;
+
+    // --------------------------------------------------------
+    inline bool operator==(const Structure &other) const {
+        return name == other.name; // name is meant to be an unique identifier
+    }
+
+    // --------------------------------------------------------
+    inline bool operator!=(const Structure &other) const {
+        return name != other.name;
+    }
+
+    // --------------------------------------------------------
+    /** Try to read an instance of the structure from the stream
+     *  and attempt to convert to `T`. This is done by
+     *  an appropriate specialization. If none is available,
+     *  a compiler complain is the result.
+     *  @param dest Destination value to be written
+     *  @param db File database, including input stream. */
+    template <typename T>
+    void Convert(T &dest, const FileDatabase &db) const;
+
+    // --------------------------------------------------------
+    // generic converter
+    template <typename T>
+    void Convert(std::shared_ptr<ElemBase> in, const FileDatabase &db) const;
+
+    // --------------------------------------------------------
+    // generic allocator
+    template <typename T>
+    std::shared_ptr<ElemBase> Allocate() const;
+
+    // --------------------------------------------------------
+    // field parsing for 1d arrays
+    template <int error_policy, typename T, size_t M>
+    void ReadFieldArray(T (&out)[M], const char *name,
+            const FileDatabase &db) const;
+
+    // --------------------------------------------------------
+    // field parsing for 2d arrays
+    template <int error_policy, typename T, size_t M, size_t N>
+    void ReadFieldArray2(T (&out)[M][N], const char *name,
+            const FileDatabase &db) const;
+
+    // --------------------------------------------------------
+    // field parsing for pointer or dynamic array types
+    // (std::shared_ptr)
+    // The return value indicates whether the data was already cached.
+    template <int error_policy, template <typename> class TOUT, typename T>
+    bool ReadFieldPtr(TOUT<T> &out, const char *name,
+            const FileDatabase &db,
+            bool non_recursive = false) const;
+
+    // --------------------------------------------------------
+    // field parsing for static arrays of pointer or dynamic
+    // array types (std::shared_ptr[])
+    // The return value indicates whether the data was already cached.
+    template <int error_policy, template <typename> class TOUT, typename T, size_t N>
+    bool ReadFieldPtr(TOUT<T> (&out)[N], const char *name,
+            const FileDatabase &db) const;
+
+    // --------------------------------------------------------
+    // field parsing for `normal` values
+    // The return value indicates whether the data was already cached.
+    template <int error_policy, typename T>
+    void ReadField(T &out, const char *name,
+            const FileDatabase &db) const;
+
+    // --------------------------------------------------------
+    /**
+    *   @brief  field parsing for dynamic vectors
+    *   @param[in]  out vector of struct to be filled
+    *   @param[in]  name of field
+    *   @param[in]  db to access the file, dna, ...
+    *   @return true when read was successful
+    */
+    template <int error_policy, template <typename> class TOUT, typename T>
+    bool ReadFieldPtrVector(vector<TOUT<T>> &out, const char *name, const FileDatabase &db) const;
+
+    /**
+    *   @brief  parses raw customdata
+    *   @param[in]  out shared_ptr to be filled
+    *   @param[in]  cdtype customdata type to read
+    *   @param[in]  name of field ptr
+    *   @param[in]  db to access the file, dna, ...
+    *   @return true when read was successful
+    */
+    template <int error_policy>
+    bool ReadCustomDataPtr(std::shared_ptr<ElemBase> &out, int cdtype, const char *name, const FileDatabase &db) const;
+
+private:
+    // --------------------------------------------------------
+    template <template <typename> class TOUT, typename T>
+    bool ResolvePointer(TOUT<T> &out, const Pointer &ptrval,
+            const FileDatabase &db, const Field &f,
+            bool non_recursive = false) const;
+
+    // --------------------------------------------------------
+    template <template <typename> class TOUT, typename T>
+    bool ResolvePointer(vector<TOUT<T>> &out, const Pointer &ptrval,
+            const FileDatabase &db, const Field &f, bool) const;
+
+    // --------------------------------------------------------
+    bool ResolvePointer(std::shared_ptr<FileOffset> &out, const Pointer &ptrval,
+            const FileDatabase &db, const Field &f, bool) const;
+
+    // --------------------------------------------------------
+    inline const FileBlockHead *LocateFileBlockForAddress(
+            const Pointer &ptrval,
+            const FileDatabase &db) const;
+
+private:
+    // ------------------------------------------------------------------------------
+    template <typename T>
+    T *_allocate(std::shared_ptr<T> &out, size_t &s) const {
+        out = std::shared_ptr<T>(new T());
+        s = 1;
+        return out.get();
+    }
+
+    template <typename T>
+    T *_allocate(vector<T> &out, size_t &s) const {
+        out.resize(s);
+        return s ? &out.front() : nullptr;
+    }
+
+    // --------------------------------------------------------
+    template <int error_policy>
+    struct _defaultInitializer {
+
+        template <typename T, unsigned int N>
+        void operator()(T (&out)[N], const char * = nullptr) {
+            for (unsigned int i = 0; i < N; ++i) {
+                out[i] = T();
+            }
+        }
+
+        template <typename T, unsigned int N, unsigned int M>
+        void operator()(T (&out)[N][M], const char * = nullptr) {
+            for (unsigned int i = 0; i < N; ++i) {
+                for (unsigned int j = 0; j < M; ++j) {
+                    out[i][j] = T();
+                }
+            }
+        }
+
+        template <typename T>
+        void operator()(T &out, const char * = nullptr) {
+            out = T();
+        }
+    };
+
+private:
+    mutable size_t cache_idx;
+};
+
+// --------------------------------------------------------
+template <>
+struct Structure::_defaultInitializer<ErrorPolicy_Warn> {
+
+    template <typename T>
+    void operator()(T &out, const char *reason = "<add reason>") {
+        ASSIMP_LOG_WARN(reason);
+
+        // ... and let the show go on
+        _defaultInitializer<0 /*ErrorPolicy_Igno*/>()(out);
+    }
+};
+
+template <>
+struct Structure::_defaultInitializer<ErrorPolicy_Fail> {
+
+    template <typename T>
+    void operator()(T & /*out*/, const char * = "") {
+        // obviously, it is crucial that _DefaultInitializer is used
+        // only from within a catch clause.
+        throw DeadlyImportError("Constructing BlenderDNA Structure encountered an error");
+    }
+};
+
+// -------------------------------------------------------------------------------------------------------
+template <>
+inline bool Structure ::ResolvePointer<std::shared_ptr, ElemBase>(std::shared_ptr<ElemBase> &out,
+        const Pointer &ptrval,
+        const FileDatabase &db,
+        const Field &f,
+        bool) const;
+
+// -------------------------------------------------------------------------------
+/** Represents the full data structure information for a single BLEND file.
+ *  This data is extracted from the DNA1 chunk in the file.
+ *  #DNAParser does the reading and represents currently the only place where
+ *  DNA is altered.*/
+// -------------------------------------------------------------------------------
+class DNA {
+public:
+    typedef void (Structure::*ConvertProcPtr)(
+            std::shared_ptr<ElemBase> in,
+            const FileDatabase &) const;
+
+    typedef std::shared_ptr<ElemBase> (
+            Structure::*AllocProcPtr)() const;
+
+    typedef std::pair<AllocProcPtr, ConvertProcPtr> FactoryPair;
+
+public:
+    std::map<std::string, FactoryPair> converters;
+    vector<Structure> structures;
+    std::map<std::string, size_t> indices;
+
+public:
+    // --------------------------------------------------------
+    /** Access a structure by its canonical name, the pointer version returns nullptr on failure
+      * while the reference version raises an error. */
+    inline const Structure &operator[](const std::string &ss) const;
+    inline const Structure *Get(const std::string &ss) const;
+
+    // --------------------------------------------------------
+    /** Access a structure by its index */
+    inline const Structure &operator[](const size_t i) const;
+
+public:
+    // --------------------------------------------------------
+    /** Add structure definitions for all the primitive types,
+     *  i.e. integer, short, char, float */
+    void AddPrimitiveStructures();
+
+    // --------------------------------------------------------
+    /** Fill the @c converters member with converters for all
+     *  known data types. The implementation of this method is
+     *  in BlenderScene.cpp and is machine-generated.
+     *  Converters are used to quickly handle objects whose
+     *  exact data type is a runtime-property and not yet
+     *  known at compile time (consider Object::data).*/
+    void RegisterConverters();
+
+    // --------------------------------------------------------
+    /** Take an input blob from the stream, interpret it according to
+     *  a its structure name and convert it to the intermediate
+     *  representation.
+     *  @param structure Destination structure definition
+     *  @param db File database.
+     *  @return A null pointer if no appropriate converter is available.*/
+    std::shared_ptr<ElemBase> ConvertBlobToStructure(
+            const Structure &structure,
+            const FileDatabase &db) const;
+
+    // --------------------------------------------------------
+    /** Find a suitable conversion function for a given Structure.
+     *  Such a converter function takes a blob from the input
+     *  stream, reads as much as it needs, and builds up a
+     *  complete object in intermediate representation.
+     *  @param structure Destination structure definition
+     *  @param db File database.
+     *  @return A null pointer in .first if no appropriate converter is available.*/
+    FactoryPair GetBlobToStructureConverter(
+            const Structure &structure,
+            const FileDatabase &db) const;
+
+#if ASSIMP_BUILD_BLENDER_DEBUG_DNA
+    // --------------------------------------------------------
+    /** Dump the DNA to a text file. This is for debugging purposes.
+     *  The output file is `dna.txt` in the current working folder*/
+    void DumpToFile();
+#endif
+
+    // --------------------------------------------------------
+    /** Extract array dimensions from a C array declaration, such
+     *  as `...[4][6]`. Returned string would be `...[][]`.
+     *  @param out
+     *  @param array_sizes Receive maximally two array dimensions,
+     *    the second element is set to 1 if the array is flat.
+     *    Both are set to 1 if the input is not an array.
+     *  @throw DeadlyImportError if more than 2 dimensions are
+     *    encountered. */
+    static void ExtractArraySize(
+            const std::string &out,
+            size_t array_sizes[2]);
+};
+
+// special converters for primitive types
+template <>
+inline void Structure ::Convert<int>(int &dest, const FileDatabase &db) const;
+template <>
+inline void Structure ::Convert<short>(short &dest, const FileDatabase &db) const;
+template <>
+inline void Structure ::Convert<char>(char &dest, const FileDatabase &db) const;
+template <>
+inline void Structure ::Convert<float>(float &dest, const FileDatabase &db) const;
+template <>
+inline void Structure ::Convert<double>(double &dest, const FileDatabase &db) const;
+template <>
+inline void Structure ::Convert<Pointer>(Pointer &dest, const FileDatabase &db) const;
+
+// -------------------------------------------------------------------------------
+/** Describes a master file block header. Each master file sections holds n
+ *  elements of a certain SDNA structure (or otherwise unspecified data). */
+// -------------------------------------------------------------------------------
+struct FileBlockHead {
+    // points right after the header of the file block
+    StreamReaderAny::pos start;
+
+    std::string id;
+    size_t size;
+
+    // original memory address of the data
+    Pointer address;
+
+    // index into DNA
+    unsigned int dna_index;
+
+    // number of structure instances to follow
+    size_t num;
+
+    // file blocks are sorted by address to quickly locate specific memory addresses
+    bool operator<(const FileBlockHead &o) const {
+        return address.val < o.address.val;
+    }
+
+    // for std::upper_bound
+    operator const Pointer &() const {
+        return address;
+    }
+};
+
+// for std::upper_bound
+inline bool operator<(const Pointer &a, const Pointer &b) {
+    return a.val < b.val;
+}
+
+// -------------------------------------------------------------------------------
+/** Utility to read all master file blocks in turn. */
+// -------------------------------------------------------------------------------
+class SectionParser {
+public:
+    // --------------------------------------------------------
+    /** @param stream Inout stream, must point to the
+     *  first section in the file. Call Next() once
+     *  to have it read.
+     *  @param ptr64 Pointer size in file is 64 bits? */
+    SectionParser(StreamReaderAny &stream, bool ptr64) :
+            stream(stream), ptr64(ptr64) {
+        current.size = current.start = 0;
+    }
+
+public:
+    // --------------------------------------------------------
+    const FileBlockHead &GetCurrent() const {
+        return current;
+    }
+
+public:
+    // --------------------------------------------------------
+    /** Advance to the next section.
+     *  @throw DeadlyImportError if the last chunk was passed. */
+    void Next();
+
+public:
+    FileBlockHead current;
+    StreamReaderAny &stream;
+    bool ptr64;
+};
+
+#ifndef ASSIMP_BUILD_BLENDER_NO_STATS
+// -------------------------------------------------------------------------------
+/** Import statistics, i.e. number of file blocks read*/
+// -------------------------------------------------------------------------------
+class Statistics {
+
+public:
+    Statistics() :
+            fields_read(), pointers_resolved(), cache_hits()
+            //      , blocks_read       ()
+            ,
+            cached_objects() {}
+
+public:
+    /** total number of fields we read */
+    unsigned int fields_read;
+
+    /** total number of resolved pointers */
+    unsigned int pointers_resolved;
+
+    /** number of pointers resolved from the cache */
+    unsigned int cache_hits;
+
+    /** number of blocks (from  FileDatabase::entries)
+      we did actually read from. */
+    // unsigned int blocks_read;
+
+    /** objects in FileData::cache */
+    unsigned int cached_objects;
+};
+#endif
+
+// -------------------------------------------------------------------------------
+/** The object cache - all objects addressed by pointers are added here. This
+ *  avoids circular references and avoids object duplication. */
+// -------------------------------------------------------------------------------
+template <template <typename> class TOUT>
+class ObjectCache {
+public:
+    typedef std::map<Pointer, TOUT<ElemBase>> StructureCache;
+
+public:
+    ObjectCache(const FileDatabase &db) :
+            db(db) {
+        // currently there are only ~400 structure records per blend file.
+        // we read only a small part of them and don't cache objects
+        // which we don't need, so this should suffice.
+        caches.reserve(64);
+    }
+
+public:
+    // --------------------------------------------------------
+    /** Check whether a specific item is in the cache.
+     *  @param s Data type of the item
+     *  @param out Output pointer. Unchanged if the
+     *   cache doesn't know the item yet.
+     *  @param ptr Item address to look for. */
+    template <typename T>
+    void get(
+            const Structure &s,
+            TOUT<T> &out,
+            const Pointer &ptr) const;
+
+    // --------------------------------------------------------
+    /** Add an item to the cache after the item has
+     * been fully read. Do not insert anything that
+     * may be faulty or might cause the loading
+     * to abort.
+     *  @param s Data type of the item
+     *  @param out Item to insert into the cache
+     *  @param ptr address (cache key) of the item. */
+    template <typename T>
+    void set(const Structure &s,
+            const TOUT<T> &out,
+            const Pointer &ptr);
+
+private:
+    mutable vector<StructureCache> caches;
+    const FileDatabase &db;
+};
+
+// -------------------------------------------------------------------------------
+// -------------------------------------------------------------------------------
+template <>
+class ObjectCache<Blender::vector> {
+public:
+    ObjectCache(const FileDatabase &) {}
+
+    template <typename T>
+    void get(const Structure &, vector<T> &, const Pointer &) {}
+    template <typename T>
+    void set(const Structure &, const vector<T> &, const Pointer &) {}
+};
+
+#ifdef _MSC_VER
+#pragma warning(disable : 4355)
+#endif
+
+// -------------------------------------------------------------------------------
+/** Memory representation of a full BLEND file and all its dependencies. The
+ *  output aiScene is constructed from an instance of this data structure. */
+// -------------------------------------------------------------------------------
+class FileDatabase {
+    template <template <typename> class TOUT>
+    friend class ObjectCache;
+
+public:
+    FileDatabase() :
+            _cacheArrays(*this), _cache(*this), next_cache_idx() {}
+
+public:
+    // publicly accessible fields
+    bool i64bit;
+    bool little;
+
+    DNA dna;
+    std::shared_ptr<StreamReaderAny> reader;
+    vector<FileBlockHead> entries;
+
+public:
+    Statistics &stats() const {
+        return _stats;
+    }
+
+    // For all our templates to work on both shared_ptr's and vector's
+    // using the same code, a dummy cache for arrays is provided. Actually,
+    // arrays of objects are never cached because we can't easily
+    // ensure their proper destruction.
+    template <typename T>
+    ObjectCache<std::shared_ptr> &cache(std::shared_ptr<T> & /*in*/) const {
+        return _cache;
+    }
+
+    template <typename T>
+    ObjectCache<vector> &cache(vector<T> & /*in*/) const {
+        return _cacheArrays;
+    }
+
+private:
+#ifndef ASSIMP_BUILD_BLENDER_NO_STATS
+    mutable Statistics _stats;
+#endif
+
+    mutable ObjectCache<vector> _cacheArrays;
+    mutable ObjectCache<std::shared_ptr> _cache;
+
+    mutable size_t next_cache_idx;
+};
+
+#ifdef _MSC_VER
+#pragma warning(default : 4355)
+#endif
+
+// -------------------------------------------------------------------------------
+/** Factory to extract a #DNA from the DNA1 file block in a BLEND file. */
+// -------------------------------------------------------------------------------
+class DNAParser {
+
+public:
+    /** Bind the parser to a empty DNA and an input stream */
+    DNAParser(FileDatabase &db) :
+            db(db) {}
+
+public:
+    // --------------------------------------------------------
+    /** Locate the DNA in the file and parse it. The input
+     *  stream is expected to point to the beginning of the DN1
+     *  chunk at the time this method is called and is
+     *  undefined afterwards.
+     *  @throw DeadlyImportError if the DNA cannot be read.
+     *  @note The position of the stream pointer is undefined
+     *    afterwards.*/
+    void Parse();
+
+public:
+    /** Obtain a reference to the extracted DNA information */
+    const Blender::DNA &GetDNA() const {
+        return db.dna;
+    }
+
+private:
+    FileDatabase &db;
+};
+
+/**
+*   @brief  read CustomData's data to ptr to mem
+*   @param[out] out memory ptr to set
+*   @param[in]  cdtype  to read
+*   @param[in]  cnt cnt of elements to read
+*   @param[in]  db to read elements from
+*   @return true when ok
+*/
+bool readCustomData(std::shared_ptr<ElemBase> &out, int cdtype, size_t cnt, const FileDatabase &db);
+
+} // namespace Blender
+} // namespace Assimp
+
+#include "BlenderDNA.inl"
+
+#endif