// has to be the FIRST include !
#include "./../H/common.h"

#include "./H/mem.h"
/**
 * Join two memory areas into one.
 *
 * Allocates memmory and concatenates the two regions in it.
 *
 * @author  Pechy
 *
 * @param one first region of memory
 * @param oneLen its length
 * @param two second memory region
 * @param twoLe its lengthn
 *
 * @return allocated memory that contains copies of the two regions
 *
 * @see     MessageCreator, Cipherer, Translator
 */
int mixMemCat( char *one, int oneLen, char *two, int twoLen, 
               char **result)
{
  *result = new char[oneLen + twoLen];

  memcpy(*result, one, oneLen);
  memcpy(*result + oneLen, two, twoLen);

  return oneLen + twoLen;
}
/**
 * Encapsulates data in a siple way.
 *
 * Take the data and add a header indicating the lenght of data part,
 * the header is of type Size.
 *
 * @author  Pechy
 *
 * @param data data we want to act on 
 * @param dataLen lenght of data 
 *
 * @return allocated memory that contains the header and the data
 *
 * @see MessageCreator, Cipherer, Translator, 
 * ExtractDataFromSizeHeaderAnnotatedStream()
 *
 */
char *ExtractDataFromSizeHeaderAnnotatedStream(char *data, Size dataLen,
                                               Size *dataOutLen)
{
  Size tmpSize = *((Size *) data);
  if (tmpSize > (dataLen - sizeof(Size))) {
    return NULL;
  }

  char *tmpChar = new char [tmpSize];
  memcpy(tmpChar, data + sizeof(Size), tmpSize);
  (*dataOutLen) = tmpSize;

  return(tmpChar);
}
/**
 * Extracts data.
 *
 * Extracts data from the construct made by AddSizeHeaderAsDataSize()
 *
 * @author  Pechy
 *
 * @param dataIn data we want to extract something from
 * @param dataInLen lenght of dataIn
 * @param dataOutLen the len of returned data
 *
 * @return allocated memory that contains the data of header length
 *
 * @see MessageCreator, Cipherer, Translator, AddSizeHeaderAsDataSize()
 */
char *AddSizeHeaderAsDataSize(char *data, Size dataLen)
{
  char *tmpChar = new char [dataLen + sizeof(Size)];
  memcpy(tmpChar, &dataLen, sizeof(Size));
  memcpy(tmpChar + sizeof(Size), data, dataLen);

  return(tmpChar);
}