HeaderBufferInfo.h

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/*
 * SWC-DB© Copyright since 2019 Alex Kashirin <kashirin.alex@gmail.com>
 * License details at <https://github.com/kashirin-alex/swc-db/#license>
 */
 
#ifndef swcdb_core_comm_HeaderBufferInfo_h
#define swcdb_core_comm_HeaderBufferInfo_h
 
 
#include "swcdb/core/Compat.h"
#include "swcdb/core/Encoder.h"
#include "swcdb/core/Serialization.h"
#include "swcdb/core/Checksum.h"
 
 
namespace SWC { namespace Comm {
 
 
struct BufferInfo final {
 
  SWC_CAN_INLINE
  BufferInfo()  noexcept
    : size(0),
      size_plain(0),
      chksum(0),
      encoder(Core::Encoder::Type::PLAIN) {
  }
 
  SWC_CAN_INLINE
  void reset() noexcept {
    size = size_plain = chksum = 0;
    encoder = Core::Encoder::Type::PLAIN;
  }
 
  SWC_CAN_INLINE
  uint8_t encoded_length() const noexcept {
    uint8_t sz = Serialization::encoded_length_vi32(size) + 5;
    if(encoder != Core::Encoder::Type::PLAIN)
      sz += Serialization::encoded_length_vi32(size_plain);
    return sz;
  }
 
  SWC_CAN_INLINE
  void encode(uint8_t** bufp) const {
    Serialization::encode_vi32(bufp, size);
    Serialization::encode_i8(bufp, uint8_t(encoder));
    if(encoder != Core::Encoder::Type::PLAIN)
      Serialization::encode_vi32(bufp, size_plain);
    Serialization::encode_i32(bufp, chksum);
  }
 
  SWC_CAN_INLINE
  void decode(const uint8_t** bufp, size_t* remainp) {
    size = Serialization::decode_vi32(bufp, remainp);
    encoder = Core::Encoder::Type(Serialization::decode_i8(bufp, remainp));
    if(encoder != Core::Encoder::Type::PLAIN)
      size_plain = Serialization::decode_vi32(bufp, remainp);
    chksum = Serialization::decode_i32(bufp, remainp);
  }
 
  void encode(Core::Encoder::Type encoder, StaticBuffer& data);
 
  void decode(int& err, StaticBuffer& data) const;
 
  void print(std::ostream& out) const;
 
  uint32_t            size;        
  uint32_t            size_plain;  
  uint32_t            chksum;      
  Core::Encoder::Type encoder;     
 
} __attribute__((packed));
 
 
}}
 
 
 
#ifdef SWC_IMPL_SOURCE
#include "swcdb/core/comm/HeaderBufferInfo.cc"
#endif
 
#endif // swcdb_core_comm_HeaderBufferInfo_h