new stuff

assimp/code/CApi/CInterfaceIOWrapper.h

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+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, 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 aiFileIO -> IOSystem wrapper*/
+
+#ifndef AI_CIOSYSTEM_H_INCLUDED
+#define AI_CIOSYSTEM_H_INCLUDED
+
+#include <assimp/cfileio.h>
+#include <assimp/IOStream.hpp>
+#include <assimp/IOSystem.hpp>
+#include <assimp/ai_assert.h>
+
+namespace Assimp {
+
+class CIOSystemWrapper;
+
+// ------------------------------------------------------------------------------------------------
+/// @brief Custom IOStream implementation for the C-API-
+// ------------------------------------------------------------------------------------------------
+class CIOStreamWrapper final : public IOStream {
+public:
+    explicit CIOStreamWrapper(aiFile *pFile, CIOSystemWrapper *io);
+    ~CIOStreamWrapper() override;
+    size_t Read(void *pvBuffer, size_t pSize, size_t pCount) override;
+    size_t Write(const void *pvBuffer, size_t pSize, size_t pCount) override;
+    aiReturn Seek(size_t pOffset, aiOrigin pOrigin) override;
+    size_t Tell(void) const override;
+    size_t FileSize() const override;
+    void Flush() override;
+
+private:
+    aiFile *mFile;
+    CIOSystemWrapper *mIO;
+};
+
+inline CIOStreamWrapper::CIOStreamWrapper(aiFile *pFile, CIOSystemWrapper *io) :
+        mFile(pFile),
+        mIO(io) {
+    ai_assert(io != nullptr);
+}
+
+// ------------------------------------------------------------------------------------------------
+/// @brief Custom IO-System wrapper implementation for the C-API.
+// ------------------------------------------------------------------------------------------------
+class CIOSystemWrapper final : public IOSystem {
+    friend class CIOStreamWrapper;
+
+public:
+    explicit CIOSystemWrapper(aiFileIO *pFile);
+    ~CIOSystemWrapper() override = default;
+    bool Exists(const char *pFile) const override;
+    char getOsSeparator() const override;
+    IOStream *Open(const char *pFile, const char *pMode = "rb") override;
+    void Close(IOStream *pFile) override;
+
+private:
+    aiFileIO *mFileSystem;
+};
+
+inline CIOSystemWrapper::CIOSystemWrapper(aiFileIO *pFile) : mFileSystem(pFile) {
+    ai_assert(pFile != nullptr);
+}
+
+} // namespace Assimp
+
+#endif // AI_CIOSYSTEM_H_INCLUDED