Function _httpTLSRead

cups/tls-sspi.c:698–905

 */

int					/* O - Bytes read */
_httpTLSRead(http_t *http,		/* I - HTTP connection */
	     char   *buf,		/* I - Buffer to store data */
	     int    len)		/* I - Length of buffer */
{
  int		i;			/* Looping var */
  _http_sspi_t	*sspi = http->tls;	/* SSPI data */
  SecBufferDesc	message;		/* Array of SecBuffer struct */
  SecBuffer	buffers[4] = { 0 };	/* Security package buffer */
  int		num = 0;		/* Return value */
  PSecBuffer	pDataBuffer;		/* Data buffer */
  PSecBuffer	pExtraBuffer;		/* Excess data buffer */
  SECURITY_STATUS scRet;		/* SSPI status */


  DEBUG_printf(("4_httpTLSRead(http=%p, buf=%p, len=%d)", http, buf, len));

 /*
  * If there are bytes that have already been decrypted and have not yet been
  * read, return those...
  */

  if (sspi->readBufferUsed > 0)
  {
    int bytesToCopy = min(sspi->readBufferUsed, len);
					/* Number of bytes to copy */

    memcpy(buf, sspi->readBuffer, bytesToCopy);
    sspi->readBufferUsed -= bytesToCopy;

    if (sspi->readBufferUsed > 0)
      memmove(sspi->readBuffer, sspi->readBuffer + bytesToCopy, sspi->readBufferUsed);

    DEBUG_printf(("5_httpTLSRead: Returning %d bytes previously decrypted.", bytesToCopy));

    return (bytesToCopy);
  }

 /*
  * Initialize security buffer structs
  */

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

  do
  {
   /*
    * If there is not enough space in the buffer, then increase its size...
    */

    if (sspi->decryptBufferLength <= sspi->decryptBufferUsed)
    {
      BYTE *temp;			/* New buffer */

      if (sspi->decryptBufferLength >= 262144)
      {