Function _httpTLSWrite

cups/tls-sspi.c:1126–1225

 */

int					/* O - Bytes written */
_httpTLSWrite(http_t     *http,		/* I - HTTP connection */
	      const char *buf,		/* I - Buffer holding data */
	      int        len)		/* I - Length of buffer */
{
  _http_sspi_t	*sspi = http->tls;	/* SSPI data */
  SecBufferDesc	message;		/* Array of SecBuffer struct */
  SecBuffer	buffers[4] = { 0 };	/* Security package buffer */
  int		bufferLen;		/* Buffer length */
  int		bytesLeft;		/* Bytes left to write */
  const char	*bufptr;		/* Pointer into buffer */
  int		num = 0;		/* Return value */


  bufferLen = sspi->streamSizes.cbMaximumMessage + sspi->streamSizes.cbHeader + sspi->streamSizes.cbTrailer;

  if (bufferLen > sspi->writeBufferLength)
  {
    BYTE *temp;				/* New buffer pointer */

    if ((temp = (BYTE *)realloc(sspi->writeBuffer, bufferLen)) == NULL)
    {
      _cupsSetHTTPError(HTTP_STATUS_ERROR);
      DEBUG_printf(("5_httpTLSWrite: Unable to allocate buffer of %d bytes.", bufferLen));
      WSASetLastError(E_OUTOFMEMORY);
      return (-1);
    }

    sspi->writeBuffer       = temp;
    sspi->writeBufferLength = bufferLen;
  }

  bytesLeft = len;
  bufptr    = buf;

  while (bytesLeft)
  {
    int chunk = min((int)sspi->streamSizes.cbMaximumMessage, bytesLeft);
					/* Size of data to write */
    SECURITY_STATUS scRet;		/* SSPI status */

   /*
    * Copy user data into the buffer, starting just past the header...
    */

    memcpy(sspi->writeBuffer + sspi->streamSizes.cbHeader, bufptr, chunk);

   /*
    * Setup the SSPI buffers
    */

    message.ulVersion = SECBUFFER_VERSION;
    message.cBuffers  = 4;
    message.pBuffers  = buffers;

    buffers[0].pvBuffer   = sspi->writeBuffer;
    buffers[0].cbBuffer   = sspi->streamSizes.cbHeader;
    buffers[0].BufferType = SECBUFFER_STREAM_HEADER;