rtEncoder.c

/* Copyright [2017] [Comcast, Corp.]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include "rtEncoder.h"
#include <arpa/inet.h>
#include <string.h>
#include <stdio.h>

rtError
rtEncoder_EncodeInt32(uint8_t** itr, int32_t n)
{
  int32_t net = htonl(n);
  memcpy(*itr, &net, 4);
  *itr += 4;
  return RT_OK;
}

rtError
rtEncoder_DecodeInt32(uint8_t const** itr, int32_t* n)
{
  int32_t host = 0;
  memcpy(&host, *itr, 4);
  host = ntohl(host);
  *n = host;
  *itr += 4;
  return RT_OK;
}

rtError
rtEncoder_EncodeString(uint8_t** itr, char const* s, uint32_t* n)
{
  uint32_t len = 0;
  if (n)
    len = *n;
  else
    len = strlen(s);
  rtEncoder_EncodeInt32(itr, (int32_t) len);
  memcpy(*itr, s, len);
  *itr += len;
  return RT_OK;
}

rtError
rtEncoder_DecodeString(uint8_t const** itr, char* s, uint32_t* n)
{
  uint32_t len = 0;
  rtEncoder_DecodeInt32(itr, (int32_t *) &len);
  memcpy(s, *itr, len);
  *n = len;
  *itr += len;
  return RT_OK;
}

rtError
rtEncoder_EncodeUInt16(uint8_t** itr, uint16_t n)
{
  uint16_t net = htons(n);
  memcpy(*itr, &net, 2);
  *itr += 2;
  return RT_OK;
}

rtError
rtEncoder_DecodeUInt16(uint8_t const** itr, uint16_t* n)
{
  uint16_t host = 0;
  memcpy(&host, *itr, 2);
  host = ntohs(host);
  *n = host;
  *itr += 2;
  return RT_OK;
}

rtError
rtEncoder_EncodeUInt32(uint8_t** itr, uint32_t n)
{
  return rtEncoder_EncodeInt32(itr, (int32_t) n);
}

rtError
rtEncoder_DecodeUInt32(uint8_t const** itr, uint32_t* n)
{
  return rtEncoder_DecodeInt32(itr, (int32_t *)n);
}