ReadOnlyMemoryStream.h

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/*
 * Copyright (c) 2020 pongasoft
 *
 * Licensed under the Apache License, Version 2.0 or the MIT license,
 * at your option. You may not use this file except in compliance with
 * one of these licenses. You may obtain copies of the licenses at:
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 * https://opensource.org/licenses/MIT
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 *
 * @author Yan Pujante
 */
 
#ifndef JAMBA_READONLYMEMORYSTREAM_H
#define JAMBA_READONLYMEMORYSTREAM_H
 
#include <pluginterfaces/base/ibstream.h>
 
namespace pongasoft::VST::VstUtils {
 
using namespace Steinberg;
 
class ReadOnlyMemoryStream : public IBStream
{
public:
  ReadOnlyMemoryStream(char const *iMemory, TSize iMemorySize);
 
  virtual ~ReadOnlyMemoryStream() = default;
 
  //---IBStream---------------------------------------
  virtual tresult PLUGIN_API read(void *buffer, int32 numBytes, int32 *numBytesRead) SMTG_OVERRIDE;
  virtual tresult PLUGIN_API write(void *buffer, int32 numBytes, int32 *numBytesWritten) SMTG_OVERRIDE;
  virtual tresult PLUGIN_API seek(int64 pos, int32 mode, int64 *result) SMTG_OVERRIDE;
  virtual tresult PLUGIN_API tell(int64 *pos) SMTG_OVERRIDE;
 
  TSize getSize() const { return fMemorySize - fPos; };    
  inline char const* getData() const { return fMemory; }
  TSize getMemorySize() const { return fMemorySize; };    
  inline int64 pos() const { return fPos; }
 
  //------------------------------------------------------------------------
DECLARE_FUNKNOWN_METHODS
 
protected:
  char const *fMemory;        // memory block
  TSize fMemorySize;    // size of the memory block
  int64 fPos;           // stream pointer
};
 
}
 
#endif //JAMBA_READONLYMEMORYSTREAM_H