// Encrypt/Decrypt functionality, called by pager.c
void sqlite3Codec(void *pArg, void *data, Pgno nPageNum, int nMode)
{
  LPCRYPTBLOCK pBlock = (LPCRYPTBLOCK)pArg;
  DWORD dwPageSize;
  LPVOID pvTemp;
  PgHdr *pageHeader;

  if (!pBlock) return;

  // Make sure the page size for the pager is still the same as the page size
  // for the cryptblock.  If the user changed it, we need to adjust!



  pageHeader = DATA_TO_PGHDR(data);
  if (pageHeader->pPager->pageSize != pBlock->dwPageSize)
  {
    // Update the cryptblock to reflect the new page size
    CreateCryptBlock(0, pageHeader->pPager, pBlock);

  }

  /* Block ciphers often need to write extra padding beyond the 
  data block.  We don't have that luxury for a given page of data so
  we must copy the page data to a buffer that IS large enough to hold
  the padding.  We then encrypt the block and write the buffer back to
  the page without the unnecessary padding.

// Encrypt/Decrypt functionality, called by pager.c
void sqlite3Codec(void *pArg, void *data, Pgno nPageNum, int nMode)
{
  LPCRYPTBLOCK pBlock = (LPCRYPTBLOCK)pArg;
  DWORD dwPageSize;
  LPVOID pvTemp;


  if (!pBlock) return;

  // Make sure the page size for the pager is still the same as the page size
  // for the cryptblock.  If the user changed it, we need to adjust!
  if (nMode != 2)
  {
    PgHdr *pageHeader;
    pageHeader = DATA_TO_PGHDR(data);
    if (pageHeader->pPager->pageSize != pBlock->dwPageSize)
    {
      // Update the cryptblock to reflect the new page size
      CreateCryptBlock(0, pageHeader->pPager, pBlock);
    }
  }

  /* Block ciphers often need to write extra padding beyond the 
  data block.  We don't have that luxury for a given page of data so
  we must copy the page data to a buffer that IS large enough to hold
  the padding.  We then encrypt the block and write the buffer back to
  the page without the unnecessary padding.