Function cups_fill

cups/file.c:2265–2665

 */

static ssize_t				/* O - Number of bytes or -1 */
cups_fill(cups_file_t *fp)		/* I - CUPS file */
{
  ssize_t		bytes;		/* Number of bytes read */
#ifdef HAVE_LIBZ
  int			status;		/* Decompression status */
  const unsigned char	*ptr,		/* Pointer into buffer */
			*end;		/* End of buffer */
#endif /* HAVE_LIBZ */


  DEBUG_printf(("7cups_fill(fp=%p)", (void *)fp));
  DEBUG_printf(("9cups_fill: fp->ptr=%p, fp->end=%p, fp->buf=%p, fp->bufpos=" CUPS_LLFMT ", fp->eof=%d", (void *)fp->ptr, (void *)fp->end, (void *)fp->buf, CUPS_LLCAST fp->bufpos, fp->eof));

  if (fp->ptr && fp->end)
    fp->bufpos += fp->end - fp->buf;

#ifdef HAVE_LIBZ
  DEBUG_printf(("9cups_fill: fp->compressed=%d", fp->compressed));

  while (!fp->ptr || fp->compressed)
  {
   /*
    * Check to see if we have read any data yet; if not, see if we have a
    * compressed file...
    */

    if (!fp->ptr)
    {
     /*
      * Reset the file position in case we are seeking...
      */

      fp->compressed = 0;

     /*
      * Read the first bytes in the file to determine if we have a gzip'd
      * file...
      */

      if ((bytes = cups_read(fp, (char *)fp->buf, sizeof(fp->buf))) < 0)
      {
       /*
	* Can't read from file!
	*/

        DEBUG_printf(("9cups_fill: cups_read() returned " CUPS_LLFMT,
	              CUPS_LLCAST bytes));

        fp->eof = 1;

	return (-1);
      }

      if (bytes < 10 || fp->buf[0] != 0x1f ||
          (fp->buf[1] & 255) != 0x8b ||
          fp->buf[2] != 8 || (fp->buf[3] & 0xe0) != 0)
      {