3espacketreader.h

//
// author: Kazys Stepanas
//
#ifndef _3ESPACKETREADER_H_
#define _3ESPACKETREADER_H_

#include "3es-core.h"

#include "3espacketstream.h"

namespace tes
{
  class _3es_coreAPI PacketReader : public PacketStream<const PacketHeader>
  {
  public:
    PacketReader(const PacketHeader &packet);

    bool checkCrc();

    CrcType calculateCrc() const;

    uint16_t bytesAvailable() const;

    size_t readElement(uint8_t *bytes, size_t elementSize);

    size_t readArray(uint8_t *bytes, size_t elementSize, size_t elementCount);

    size_t readRaw(uint8_t *bytes, size_t byteCount);

    template <typename T>
    size_t readElement(T &element);

    template <typename T>
    size_t readArray(T *elements, size_t elementCount);

    template <typename T>
    PacketReader &operator >> (T &val);
  };

  inline uint16_t PacketReader::bytesAvailable() const
  {
    return _packet.payloadSize - _payloadPosition;
  }

  template <typename T>
  inline size_t PacketReader::readElement(T &element)
  {
    return readElement(reinterpret_cast<uint8_t *>(&element), sizeof(T));
  }

  template <typename T>
  inline size_t PacketReader::readArray(T *elements, size_t elementCount)
  {
    return readArray(reinterpret_cast<uint8_t *>(elements), sizeof(T), elementCount);
  }

  template <typename T>
  inline PacketReader &PacketReader::operator >> (T &val)
  {
    int read = readElement(val);
    _status |= !(read == sizeof(T)) * Fail;
    return *this;
  }
}

#endif // _3ESPACKETREADER_H_