encodingDecodingUtils.h

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/*********************************************************************
** Copyright (c) 2025 MAK Technologies, Inc.
** All rights reserved.
*********************************************************************/
 

#pragma once

#include <string>
#include <vlutil/vlNetTypes.h>

enum class DtPaddingTo
{
   Dt8  = 1,
   Dt16 = 2,
   Dt32 = 4,
   Dt64 = 8
};

inline unsigned DtPaddingNeeded(unsigned size, DtPaddingTo padTo)
{ 
   unsigned padding = 0;
   while ((size + padding) % (unsigned)padTo != 0)
   {
      ++padding;
   }

   return padding;
}

inline unsigned DtNetSizeOfWString(const std::wstring& str)
{
   unsigned netSize = sizeof(DtNetU32)   // array size field
      + str.size() * sizeof(DtNetInt16); // size for the string

   return netSize;
}

inline char* DtEncodeWString(char* buffer, const std::wstring& str)
{
   DtNetU32* sizePtr = reinterpret_cast<DtNetU32*>(buffer);
   *sizePtr = str.size();

   buffer += sizeof(DtNetU32);

   DtNetInt16 temp;
   for (int index = 0; index < str.size(); index++)
   {
      temp = (DtNetInt16)str[index];
      memcpy(buffer, &temp, sizeof(DtNetInt16));
      buffer += sizeof(DtNetInt16);
   }

   return buffer;
}

inline char* DtDecodeWString(char* buffer, std::wstring& str)
{
   DtNetU32* sizePtr = reinterpret_cast<DtNetU32*>(buffer);
   buffer += sizeof(DtNetU32);

   wchar_t* outBuffer = new wchar_t[*sizePtr];
   DtNetInt16* in = reinterpret_cast<DtNetInt16*>(buffer);
   wchar_t* out = outBuffer;

   for (unsigned index = 0; index < *sizePtr; ++index, out++, in++)
   {
      *out = *in;
   }

   str = std::wstring(outBuffer, *sizePtr);
   delete outBuffer;

   buffer += sizeof(DtNetInt16) * *sizePtr;

   return buffer;
}