DataStream.hpp

#pragma once
#include <QDataStream>
#include <QIODevice>
 
#include <pluginterfaces/base/ibstream.h>
 
namespace vst3
{
struct Vst3DataStream : public Steinberg::IBStream
{
public:
  QDataStream& stream;
  explicit Vst3DataStream(QDataStream& s)
      : stream{s}
  {
    s.setByteOrder(QDataStream::LittleEndian);
  }
  Steinberg::tresult queryInterface(const Steinberg::TUID _iid, void** obj) override
  {
    return Steinberg::kResultFalse;
  }
  Steinberg::uint32 addRef() override { return 1; }
  Steinberg::uint32 release() override { return 1; }
 
  Steinberg::tresult
  read(void* buffer, Steinberg::int32 numBytes, Steinberg::int32* numBytesRead) override
  {
    int count = stream.readRawData((char*)buffer, numBytes);
    if(numBytesRead)
      *numBytesRead = count;
    return Steinberg::kResultTrue;
  }
 
  Steinberg::tresult write(
      void* buffer, Steinberg::int32 numBytes,
      Steinberg::int32* numBytesWritten) override
  {
    int count = stream.writeRawData((char*)buffer, numBytes);
    if(numBytesWritten)
      *numBytesWritten = count;
 
    return Steinberg::kResultTrue;
  }
  Steinberg::tresult
  seek(Steinberg::int64 pos, Steinberg::int32 mode, Steinberg::int64* result) override
  {
    bool ok = stream.device()->seek(pos);
    if(result)
      *result = stream.device()->pos();
 
    return ok ? Steinberg::kResultTrue : Steinberg::kResultFalse;
  }
  Steinberg::tresult tell(Steinberg::int64* pos) override
  {
    if(pos)
      *pos = stream.device()->pos();
 
    return Steinberg::kResultTrue;
  }
};
}