CompositeMessageParser.hpp

//
// Copyright (c) 2010-2026 60East Technologies Inc., All Rights Reserved.
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#ifndef _AMPS_COMPOSITEMESSAGEPARSER_HPP_
#define _AMPS_COMPOSITEMESSAGEPARSER_HPP_
#include <amps/Field.hpp>
#include <vector>

namespace AMPS
{
  class CompositeMessageParser
  {
  public:
    CompositeMessageParser(void) = default;

    template <class T>
    size_t parse(const T& message_);

    size_t parse(const char* data_, size_t length_);

    size_t size(void) const;

    AMPS::Field getPart(size_t index_) const;
  private:
    typedef std::pair<const char*, size_t> PartLocator;
    typedef std::vector<PartLocator> PartVector;
    PartVector    _parts;
  };

  template <class T>
  inline size_t
  CompositeMessageParser::parse(const T& message_)
  {
    const char* data;
    size_t length;
    message_.getRawData(&data, &length);
    return parse(data, length);
  }

  inline size_t
  CompositeMessageParser::parse(const char* data_, size_t length_)
  {
    _parts.clear();
    const unsigned char* end = (const unsigned char*) data_ + length_;
    const unsigned char* p = (const unsigned char*) data_;
    while ((p + 4) <= end)
    {
      size_t partLength = p[0];
      partLength = partLength << 8 | p[1];
      partLength = partLength << 8 | p[2];
      partLength = partLength << 8 | p[3];

      p += 4;
      if (p + partLength <= end)
      {
        _parts.emplace_back(PartLocator((const char*)(p), partLength));
      }
      p += partLength;
    }
    return _parts.size();
  }
  inline size_t
  CompositeMessageParser::size(void) const
  {
    return _parts.size();
  }
  inline AMPS::Field
  CompositeMessageParser::getPart(size_t index_) const
  {
    if (index_ < _parts.size())
    {
      const PartLocator& part = _parts[index_];
      return AMPS::Field(part.first, part.second);
    }
    else
    {
      return AMPS::Field();
    }
  }
}
#endif