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diff --git a/core/fxcrt/fxcrt_posix.h b/core/fxcrt/fxcrt_posix.h
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+// Copyright 2014 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef CORE_FXCRT_FXCRT_POSIX_H_
+#define CORE_FXCRT_FXCRT_POSIX_H_
+
+#include "core/fxcrt/extension.h"
+
+#if _FXM_PLATFORM_ == _FXM_PLATFORM_LINUX_ || \
+ _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_ || \
+ _FXM_PLATFORM_ == _FXM_PLATFORM_ANDROID_
+class CFXCRT_FileAccess_Posix : public IFXCRT_FileAccess {
+ public:
+ CFXCRT_FileAccess_Posix();
+ ~CFXCRT_FileAccess_Posix() override;
+
+ // IFXCRT_FileAccess
+ FX_BOOL Open(const CFX_ByteStringC& fileName, FX_DWORD dwMode) override;
+ FX_BOOL Open(const CFX_WideStringC& fileName, FX_DWORD dwMode) override;
+ void Close() override;
+ void Release() override;
+ FX_FILESIZE GetSize() const override;
+ FX_FILESIZE GetPosition() const override;
+ FX_FILESIZE SetPosition(FX_FILESIZE pos) override;
+ size_t Read(void* pBuffer, size_t szBuffer) override;
+ size_t Write(const void* pBuffer, size_t szBuffer) override;
+ size_t ReadPos(void* pBuffer, size_t szBuffer, FX_FILESIZE pos) override;
+ size_t WritePos(const void* pBuffer,
+ size_t szBuffer,
+ FX_FILESIZE pos) override;
+ FX_BOOL Flush() override;
+ FX_BOOL Truncate(FX_FILESIZE szFile) override;
+
+ protected:
+ int32_t m_nFD;
+};
+#endif
+
+#endif // CORE_FXCRT_FXCRT_POSIX_H_