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1 <?php
2 //$Header: /home/dashley/cvsrep/e3ft_gpl01/e3ft_gpl01/webprojs/fboprime/sw/phplib/sguid.inc,v 1.4 2006/04/10 22:48:02 dashley Exp $
3 //********************************************************************************
4 //Copyright (C) 2006 David T. Ashley
5 //********************************************************************************
6 //This program or source file is free software; you can redistribute it and/or
7 //modify it under the terms of the GNU General Public License as published by
8 //the Free Software Foundation; either version 2 of the License, or (at your
9 //option) any later version.
10 //
11 //This program or source file is distributed in the hope that it will
12 //be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
14 //GNU General Public License for more details.
15 //
16 //You may have received a copy of the GNU General Public License
17 //along with this program; if not, write to the Free Software
18 //Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 //********************************************************************************
20 //Dave Ashley, 04/06
21 //-------------------------------------------------------------------------------------------------
22 //Copyright 2006 David T. Ashley
23 //-------------------------------------------------------------------------------------------------
24 //This source code and any program in which it is compiled/used is provided under the GNU GENERAL
25 //PUBLIC LICENSE, Version 3, full license text below.
26 //-------------------------------------------------------------------------------------------------
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573 //not convey it at all. For example, if you agree to terms that obligate you
574 //to collect a royalty for further conveying from those to whom you convey
575 //the Program, the only way you could satisfy both those terms and this
576 //License would be to refrain entirely from conveying the Program.
577 //
578 // 13. Use with the GNU Affero General Public License.
579 //
580 // Notwithstanding any other provision of this License, you have
581 //permission to link or combine any covered work with a work licensed
582 //under version 3 of the GNU Affero General Public License into a single
583 //combined work, and to convey the resulting work. The terms of this
584 //License will continue to apply to the part which is the covered work,
585 //but the special requirements of the GNU Affero General Public License,
586 //section 13, concerning interaction through a network will apply to the
587 //combination as such.
588 //
589 // 14. Revised Versions of this License.
590 //
591 // The Free Software Foundation may publish revised and/or new versions of
592 //the GNU General Public License from time to time. Such new versions will
593 //be similar in spirit to the present version, but may differ in detail to
594 //address new problems or concerns.
595 //
596 // Each version is given a distinguishing version number. If the
597 //Program specifies that a certain numbered version of the GNU General
598 //Public License "or any later version" applies to it, you have the
599 //option of following the terms and conditions either of that numbered
600 //version or of any later version published by the Free Software
601 //Foundation. If the Program does not specify a version number of the
602 //GNU General Public License, you may choose any version ever published
603 //by the Free Software Foundation.
604 //
605 // If the Program specifies that a proxy can decide which future
606 //versions of the GNU General Public License can be used, that proxy's
607 //public statement of acceptance of a version permanently authorizes you
608 //to choose that version for the Program.
609 //
610 // Later license versions may give you additional or different
611 //permissions. However, no additional obligations are imposed on any
612 //author or copyright holder as a result of your choosing to follow a
613 //later version.
614 //
615 // 15. Disclaimer of Warranty.
616 //
625 //
626 // 16. Limitation of Liability.
627 //
637 //
638 // 17. Interpretation of Sections 15 and 16.
639 //
640 // If the disclaimer of warranty and limitation of liability provided
641 //above cannot be given local legal effect according to their terms,
642 //reviewing courts shall apply local law that most closely approximates
643 //an absolute waiver of all civil liability in connection with the
644 //Program, unless a warranty or assumption of liability accompanies a
645 //copy of the Program in return for a fee.
646 //
648 //
649 // How to Apply These Terms to Your New Programs
650 //
651 // If you develop a new program, and you want it to be of the greatest
652 //possible use to the public, the best way to achieve this is to make it
653 //free software which everyone can redistribute and change under these terms.
654 //
655 // To do so, attach the following notices to the program. It is safest
656 //to attach them to the start of each source file to most effectively
657 //state the exclusion of warranty; and each file should have at least
658 //the "copyright" line and a pointer to where the full notice is found.
659 //
660 // <one line to give the program's name and a brief idea of what it does.>
661 // Copyright (C) <year> <name of author>
662 //
663 // This program is free software: you can redistribute it and/or modify
664 // it under the terms of the GNU General Public License as published by
665 // the Free Software Foundation, either version 3 of the License, or
666 // (at your option) any later version.
667 //
668 // This program is distributed in the hope that it will be useful,
669 // but WITHOUT ANY WARRANTY; without even the implied warranty of
671 // GNU General Public License for more details.
672 //
673 // You should have received a copy of the GNU General Public License
674 // along with this program. If not, see <http://www.gnu.org/licenses/>.
675 //
676 //Also add information on how to contact you by electronic and paper mail.
677 //
678 // If the program does terminal interaction, make it output a short
679 //notice like this when it starts in an interactive mode:
680 //
681 // <program> Copyright (C) <year> <name of author>
682 // This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
683 // This is free software, and you are welcome to redistribute it
684 // under certain conditions; type `show c' for details.
685 //
686 //The hypothetical commands `show w' and `show c' should show the appropriate
687 //parts of the General Public License. Of course, your program's commands
688 //might be different; for a GUI interface, you would use an "about box".
689 //
690 // You should also get your employer (if you work as a programmer) or school,
691 //if any, to sign a "copyright disclaimer" for the program, if necessary.
692 //For more information on this, and how to apply and follow the GNU GPL, see
693 //<http://www.gnu.org/licenses/>.
694 //
695 // The GNU General Public License does not permit incorporating your program
696 //into proprietary programs. If your program is a subroutine library, you
697 //may consider it more useful to permit linking proprietary applications with
698 //the library. If this is what you want to do, use the GNU Lesser General
699 //Public License instead of this License. But first, please read
700 //<http://www.gnu.org/philosophy/why-not-lgpl.html>.
701 //-------------------------------------------------------------------------------------------------
702 //
703 //This source file provides the code to create server globally-unique identifiers.
704 //The rationale is that since no process can have the same PID at the same
705 //time as another process, using the PID concatenated with a guaranteed
706 //unique time should provide an identifier that can never recur in the lifetime
707 //of the server.
708 //
709 //The format of the SGUID is documented in the FBO-Prime manual.
710 //
711 require_once("strfunc.inc"); //Necesssary for zero padding.
712 require_once("timeraw.inc"); //Necessary to get raw time.
713 //
714 //
715 //--------------------------------------------------------------------------------
716 //Returns the full generated SGUID as described in the documentation.
717 //
718 //Unit-tested 20060408.
719 //
720 function SGUID_sguid()
721 {
722 return("SG" . SGUID_sguid_raw());
723 }
724 //
725 //
726 //--------------------------------------------------------------------------------
727 //Returns the raw form of an SGUID (without the "SG" prefix).
728 //
729 //Unit-tested 20060408.
730 //
731 function SGUID_sguid_raw()
732 {
733 //Get the reference timestamp.
734 $reftime = TIMERAW_time_precision_mixed_array_2();
736 //Get the PID. This may also chew up some time and hopefully let the
737 //server time change.
738 $pid = getmypid();
740 //Form the SGUID proper. Hopefully this will also chew up more time.
741 $reftime_whole = $reftime[0];
742 $reftime_frac = sprintf("%d", $reftime[1]);
743 $pid_string = sprintf("%d", $pid );
744 $rv = STRFUNC_pad_left_zero($reftime_whole, 11)
745 . STRFUNC_pad_left_zero($reftime_frac, 9)
746 . STRFUNC_pad_left_zero($pid_string, 10);
748 //Spin-lock until the time has changed. With any luck, the statements
749 //above have done that for us. It is hard to judge without some data
750 //whether microsleep would make things more efficient ... let's just leave
751 //it as a pure spin-lock.
752 do
753 {
754 $comptime = TIMERAW_time_precision_mixed_array_2();
755 }
756 while (($reftime[1] == $comptime[1]) && ($reftime[0] == $comptime[0]));
758 //Return the value to the caller.
759 return($rv);
760 }
761 //
762 //
763 //--------------------------------------------------------------------------------
764 //Returns the length of a SGUID (in characters).
765 //
766 //Unit-tested 20060408.
767 //
768 function SGUID_sguid_len()
769 {
770 return(32);
771 }
772 //
773 //
774 //--------------------------------------------------------------------------------
775 //Returns 1 if the SGUID is syntactically valid or 0 otherwise.
776 //
777 //Unit-tested 20060408.
778 //
779 function SGUID_is_syntactically_valid($sguid_to_check)
780 {
781 //Must be a string data type.
782 if (! is_string($sguid_to_check))
783 return(0);
785 //Must be of appropriate length.
786 if (strlen($sguid_to_check) != 32)
787 return(0);
789 //First two characters must be "SG".
790 if (substr($sguid_to_check, 0, 2) !== "SG")
791 return(0);
793 //The remainder of the string must be digits only.
794 if (! STRFUNC_is_pure_digits(SubStr($sguid_to_check, 2, 30)))
795 return(0);
797 //If we're here, nothing obvious wrong with it.
798 return(1);
799 }
800 //--------------------------------------------------------------------------------
801 ?>

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