cef/include/wrapper/cef_byte_read_handler.h

// Copyright (c) 2012 Marshall A. Greenblatt. All rights reserved.
//
// Redistribution and use 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 Google Inc. nor the name Chromium Embedded
// Framework nor the names of its contributors may be used to endorse
// or promote products derived from this software without specific prior
// written permission.
//
// 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.
//
// ---------------------------------------------------------------------------
//
// The contents of this file are only available to applications that link
// against the libcef_dll_wrapper target.
//

#ifndef CEF_INCLUDE_WRAPPER_CEF_BYTE_READ_HANDLER_H_
#define CEF_INCLUDE_WRAPPER_CEF_BYTE_READ_HANDLER_H_
#pragma once

#include "include/base/cef_lock.h"
#include "include/cef_base.h"
#include "include/cef_stream.h"

///
// Thread safe implementation of the CefReadHandler class for reading an
// in-memory array of bytes.
///
class CefByteReadHandler : public CefReadHandler {
 public:
  ///
  // Create a new object for reading an array of bytes. An optional |source|
  // reference can be kept to keep the underlying data source from being
  // released while the reader exists.
  ///
  CefByteReadHandler(const unsigned char* bytes,
                     size_t size,
                     CefRefPtr<CefBaseRefCounted> source);

  CefByteReadHandler(const CefByteReadHandler&) = delete;
  CefByteReadHandler& operator=(const CefByteReadHandler&) = delete;

  // CefReadHandler methods.
  virtual size_t Read(void* ptr, size_t size, size_t n) override;
  virtual int Seek(int64 offset, int whence) override;
  virtual int64 Tell() override;
  virtual int Eof() override;
  virtual bool MayBlock() override { return false; }

 private:
  const unsigned char* bytes_;
  int64 size_;
  int64 offset_;
  CefRefPtr<CefBaseRefCounted> source_;

  base::Lock lock_;

  IMPLEMENT_REFCOUNTING(CefByteReadHandler);
};

#endif  // CEF_INCLUDE_WRAPPER_CEF_BYTE_READ_HANDLER_H_