hex-encode.cpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#include "hex-encode.hpp"

namespace ndn {
namespace security {
namespace transform {

static const char H2CL[16] = {
  '0', '1', '2', '3', '4', '5', '6', '7',
  '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};

static const char H2CU[16] = {
  '0', '1', '2', '3', '4', '5', '6', '7',
  '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
};

HexEncode::HexEncode(bool useUpperCase)
  : m_useUpperCase(useUpperCase)
{
}

size_t
HexEncode::convert(const uint8_t* data, size_t dataLen)
{
  setOutputBuffer(toHex(data, dataLen));
  return dataLen;
}

unique_ptr<Transform::OBuffer>
HexEncode::toHex(const uint8_t* data, size_t dataLen)
{
  const char* encodePad = (m_useUpperCase) ? H2CU : H2CL;

  auto encoded = make_unique<OBuffer>(dataLen * 2);
  uint8_t* buf = &encoded->front();
  for (size_t i = 0; i < dataLen; i++) {
    buf[0] = encodePad[((data[i] >> 4) & 0x0F)];
    buf++;
    buf[0] = encodePad[(data[i] & 0x0F)];
    buf++;
  }
  return encoded;
}



unique_ptr<Transform>
hexEncode(bool useUpperCase)
{
  return make_unique<HexEncode>(useUpperCase);
}

} // namespace transform
} // namespace security
} // namespace ndn