Function http_read_chunk

cups/http.c:4302–4360

 */

static ssize_t				/* O - Number of bytes read or -1 on error */
http_read_chunk(http_t *http,		/* I - HTTP connection */
		char   *buffer,		/* I - Buffer */
		size_t length)		/* I - Maximum bytes to read */
{
  DEBUG_printf(("7http_read_chunk(http=%p, buffer=%p, length=" CUPS_LLFMT ")", (void *)http, (void *)buffer, CUPS_LLCAST length));

  if (http->data_remaining <= 0)
  {
    char	len[32];		/* Length string */

    if (!httpGets(len, sizeof(len), http))
    {
      DEBUG_puts("8http_read_chunk: Could not get chunk length.");
      return (0);
    }

    if (!len[0])
    {
      DEBUG_puts("8http_read_chunk: Blank chunk length, trying again...");
      if (!httpGets(len, sizeof(len), http))
      {
	DEBUG_puts("8http_read_chunk: Could not get chunk length.");
	return (0);
      }
    }

    http->data_remaining = strtoll(len, NULL, 16);

    if (http->data_remaining < 0)
    {
      DEBUG_printf(("8http_read_chunk: Negative chunk length \"%s\" ("
                    CUPS_LLFMT ")", len, CUPS_LLCAST http->data_remaining));
      return (0);
    }

    DEBUG_printf(("8http_read_chunk: Got chunk length \"%s\" (" CUPS_LLFMT ")",
                  len, CUPS_LLCAST http->data_remaining));

    if (http->data_remaining == 0)
    {
     /*
      * 0-length chunk, grab trailing blank line...
      */

      httpGets(len, sizeof(len), http);
    }
  }

  DEBUG_printf(("8http_read_chunk: data_remaining=" CUPS_LLFMT,
                CUPS_LLCAST http->data_remaining));

  if (http->data_remaining <= 0)
    return (0);
  else if (length > (size_t)http->data_remaining)
    length = (size_t)http->data_remaining;

  return (http_read_buffered(http, buffer, length));