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1 // $Header: /cvsroot/esrg/sfesrg/esrgpcpj/crc32/c_main.c,v 1.5 2002/05/23 01:32:22 dtashley Exp $
3 //--------------------------------------------------------------------------------
4 //Copyright 2001 David T. Ashley
5 //-------------------------------------------------------------------------------------------------
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575 //be similar in spirit to the present version, but may differ in detail to
576 //address new problems or concerns.
577 //
578 // Each version is given a distinguishing version number. If the
579 //Program specifies that a certain numbered version of the GNU General
580 //Public License "or any later version" applies to it, you have the
581 //option of following the terms and conditions either of that numbered
582 //version or of any later version published by the Free Software
583 //Foundation. If the Program does not specify a version number of the
584 //GNU General Public License, you may choose any version ever published
585 //by the Free Software Foundation.
586 //
587 // If the Program specifies that a proxy can decide which future
588 //versions of the GNU General Public License can be used, that proxy's
589 //public statement of acceptance of a version permanently authorizes you
590 //to choose that version for the Program.
591 //
592 // Later license versions may give you additional or different
593 //permissions. However, no additional obligations are imposed on any
594 //author or copyright holder as a result of your choosing to follow a
595 //later version.
596 //
597 // 15. Disclaimer of Warranty.
598 //
607 //
608 // 16. Limitation of Liability.
609 //
619 //
620 // 17. Interpretation of Sections 15 and 16.
621 //
622 // If the disclaimer of warranty and limitation of liability provided
623 //above cannot be given local legal effect according to their terms,
624 //reviewing courts shall apply local law that most closely approximates
625 //an absolute waiver of all civil liability in connection with the
626 //Program, unless a warranty or assumption of liability accompanies a
627 //copy of the Program in return for a fee.
628 //
630 //
631 // How to Apply These Terms to Your New Programs
632 //
633 // If you develop a new program, and you want it to be of the greatest
634 //possible use to the public, the best way to achieve this is to make it
635 //free software which everyone can redistribute and change under these terms.
636 //
637 // To do so, attach the following notices to the program. It is safest
638 //to attach them to the start of each source file to most effectively
639 //state the exclusion of warranty; and each file should have at least
640 //the "copyright" line and a pointer to where the full notice is found.
641 //
642 // <one line to give the program's name and a brief idea of what it does.>
643 // Copyright (C) <year> <name of author>
644 //
645 // This program is free software: you can redistribute it and/or modify
646 // it under the terms of the GNU General Public License as published by
647 // the Free Software Foundation, either version 3 of the License, or
648 // (at your option) any later version.
649 //
650 // This program is distributed in the hope that it will be useful,
651 // but WITHOUT ANY WARRANTY; without even the implied warranty of
653 // GNU General Public License for more details.
654 //
655 // You should have received a copy of the GNU General Public License
656 // along with this program. If not, see <http://www.gnu.org/licenses/>.
657 //
658 //Also add information on how to contact you by electronic and paper mail.
659 //
660 // If the program does terminal interaction, make it output a short
661 //notice like this when it starts in an interactive mode:
662 //
663 // <program> Copyright (C) <year> <name of author>
664 // This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
665 // This is free software, and you are welcome to redistribute it
666 // under certain conditions; type `show c' for details.
667 //
668 //The hypothetical commands `show w' and `show c' should show the appropriate
669 //parts of the General Public License. Of course, your program's commands
670 //might be different; for a GUI interface, you would use an "about box".
671 //
672 // You should also get your employer (if you work as a programmer) or school,
673 //if any, to sign a "copyright disclaimer" for the program, if necessary.
674 //For more information on this, and how to apply and follow the GNU GPL, see
675 //<http://www.gnu.org/licenses/>.
676 //
677 // The GNU General Public License does not permit incorporating your program
678 //into proprietary programs. If your program is a subroutine library, you
679 //may consider it more useful to permit linking proprietary applications with
680 //the library. If this is what you want to do, use the GNU Lesser General
681 //Public License instead of this License. But first, please read
682 //<http://www.gnu.org/philosophy/why-not-lgpl.html>.
683 //-------------------------------------------------------------------------------------------------
684 //--------------------------------------------------------------------------------
685 #include <assert.h>
686 #include <process.h>
687 #include <stdio.h>
688 #include <stdlib.h>
689 #include <string.h>
690 #include <time.h>
693 #include "ccmalloc.h"
694 #include "crchashfuncs.h"
695 #include "cu_msgs.h"
696 #include "fcmiof.h"
699 #define PNAME "crc32"
700 #define PNAMEUC "CRC32"
703 const char *C_MAIN_cvcinfo(void)
704 {
705 return("$Header: /cvsroot/esrg/sfesrg/esrgpcpj/crc32/c_main.c,v 1.5 2002/05/23 01:32:22 dtashley Exp $");
706 }
709 //This is a NULL-terminated table of pointers to functions
710 //which return version control strings for all of the files
711 //which make up the INTFAC program. This information would
712 //be helpful for debugging.
713 static const char *(*C_MAIN_vcinfoptrs[])(void) =
714 {
715 //This is the main module, should come first.
716 C_MAIN_cvcinfo,
718 //And now the others, in alphabetical order.
719 CRCHASHFUNCS_hvcinfo,
720 CRCHASHFUNCS_cvcinfo,
721 CU_MSGS_hvcinfo,
722 CU_MSGS_cvcinfo,
723 FCMIOF_hvcinfo,
724 FCMIOF_cvcinfo,
725 NULL
726 };
730 #define CRC32CMAIN_BUFSIZE (131072)
731 //This value is the size of the buffer that is used when
732 //reading from a file and computing CRC. At the time of
733 //this writing (2001) a typical cluster size is 32K (not
734 //that I know what a cluster is). I suspect that this
735 //is a fairly efficient value. In any case, I believe the
736 //value should be a power of two, because any lower power
737 //of two will fill it evenly with no leftover.
739 static unsigned char CRC32MAIN_buf[CRC32CMAIN_BUFSIZE];
740 //I suspect that allocating the buffer so it is ready at
741 //load time is quicker than doing a dynamic allocation.
742 //This is the buffer used for reading file blocks.
745 //Dumps the filesize to stdout. This has a small amount of
746 //complexity.
747 void CRC32MAIN_dump_filesize(unsigned _int64 filesize, int commas)
748 {
749 char buf[100];
750 int len, i;
752 _ui64toa(filesize, buf, 10);
753 len = strlen(buf);
755 for (i=0; i<len; i++)
756 {
757 printf("%c", buf[i]);
758 if (commas && (i!=len-1) && ((len-i) % 3 == 1))
759 printf(",");
760 }
761 }
764 int c_main(int argc, char* argv[])
765 {
766 int rv=0;
767 //Function return value.
768 int i;
769 //Iteration variable.
770 FILE *fptr = NULL;
771 //Pointer to open stream.
772 size_t bytes_read;
773 //Bytes read from fread() call.
774 struct CRCHASHFUNCS_Crc32StateStruct crcgen;
775 //State vector for CRC generation.
776 unsigned crc;
777 //The actual CRC.
778 unsigned _int64 filesize = 0;
779 //The file size, calculated by adding up the numbers of characters read.
780 CU_MSGS_std_cmd_line_par_results_struct argblock;
781 //Used to hold results of what is found on command-line.
783 if (argc < 2)
784 {
785 CU_MSGS_too_few_args_msg(stdout, PNAME);
786 rv = 4;
787 goto ret_pt;
788 }
789 else if (argc==2 && !strcmp(argv[1], "-help"))
790 {
791 FCMIOF_hline();
792 printf("DESCRIPTION\n");
793 printf(" This program calculates the CRC-32 and file size (in bytes) of a file.\n");
794 printf(" The CRC-32 is calculated using code obtained from a website maintained by\n");
795 printf(" Richard A. Ellingson. The file size is calculated using the sum of the\n");
796 printf(" sizes of file reads used to obtain data in order to calculate the CRC-32.\n");
797 printf(" In all cases this file size should be the same as the size maintained by\n");
798 printf(" the operating system. The CRC-32 is provided in hexadecimal, and the\n");
799 printf(" file size is provided in base-10.\n");
800 printf("\n");
801 printf(" The CRC-32 is especially useful for digitally \"signaturing\" files. If the\n");
802 printf(" CRC-32 and file size of two files are the same, the probability is probably\n");
803 printf(" greater than 1-pow(2,-32) (>0.9999999997) that the two files have the same\n");
804 printf(" contents.\n");
805 printf("\n");
806 printf("USAGE\n");
807 printf(" crc32 fname [options]\n");
808 printf(" crc32 -help\n");
809 printf("\n");
810 printf("OPTIONS\n");
811 CU_MSGS_std_options(stdout, PNAME);
812 FCMIOF_hline();
813 CU_MSGS_toolset_info_msg(stdout, PNAME);
814 FCMIOF_hline();
815 }
816 else
817 {
818 //Analyze the remainder of the parameters on the command line. These must be
819 //"standard" parameters.
820 //We have a valid integer.
821 //Take a peek at the command-line arguments.
822 CU_MSGS_cmd_line_par_results_struct_create(&argblock);
824 for (i=2; i<argc; i++)
825 {
826 int recognized;
828 CU_MSGS_cmd_line_par_results_struct_process_arg(&argblock,
829 argv[i],
830 &recognized);
831 if (!recognized)
832 {
833 printf("\"%s\" is not a recognized command-line parameter.\n", argv[i]);
834 rv = 4;
835 goto ret_pt;
836 }
837 else if (argblock.help)
838 {
839 printf("\"-help\" cannot appear in this position.\n");
840 rv = 4;
841 goto ret_pt;
842 }
843 }
845 //Clean up the interpretation of the command-line arguments.
846 CU_MSGS_cmd_line_par_results_struct_finalize(&argblock);
848 //If we are in debug mode, we want to output the version
849 //of all of the software components making up this program,
850 //except the calling .CPP file, which is trivial and
851 //could not cause a bug. The called function will not
852 //output any horizontal lines, so must handle those
853 //manually.
854 if (argblock.debug)
855 {
856 FCMIOF_hline();
857 CU_MSGS_emit_vcinfo_from_ptr_table(stdout,C_MAIN_vcinfoptrs,PNAMEUC);
858 FCMIOF_hline();
859 }
861 //Look at the CRC32 generation table. In debug mode, fail if it is not right.
862 i=CRCHASHFUNCS_Crc32TableCheck();
863 assert(i);
864 if (!i && argblock.debug)
865 {
866 printf("WARNING: CRC32 table corrupted.\n");
867 FCMIOF_hline();
868 }
870 //Initialize the CRC32 structure.
871 CRCHASHFUNCS_Crc32StateStructOpen(&crcgen);
873 //Try to open the file for reading in binary mode.
874 //Failure is, of course, fatal.
875 fptr = fopen(argv[1], "rb");
876 if (!fptr)
877 {
878 printf("fopen() failure. Most likely cause is file does not exist.\n");
879 rv = 4;
880 goto ret_pt;
881 }
883 //Loop through, filling the buffer, doing the CRC calculations,
884 //until end of file or error.
885 while(!feof(fptr))
886 {
887 bytes_read = fread(CRC32MAIN_buf, 1, CRC32CMAIN_BUFSIZE, fptr);
889 filesize += (unsigned _int64) bytes_read;
891 if (ferror(fptr))
892 {
893 printf("fread() error.\n");
894 rv = 4;
895 goto ret_pt;
896 }
898 CRCHASHFUNCS_Crc32StateStructAddData(&crcgen, CRC32MAIN_buf, bytes_read);
899 }
901 crc = CRCHASHFUNCS_Crc32Extract(&crcgen);
903 CRCHASHFUNCS_Crc32StateStructClose(&crcgen);
905 if (!argblock.noformat)
906 printf("0x");
907 printf("%08X", crc);
908 if (argblock.noformat)
909 printf("\n");
910 else
911 printf(" (");
913 CRC32MAIN_dump_filesize(filesize, !argblock.noformat);
915 if (!argblock.noformat)
916 printf(")");
917 printf("\n");
918 }
920 ret_pt:
921 if (fptr)
922 fclose(fptr);
923 return(rv);
924 }
927 //**************************************************************************
928 // $Log: c_main.c,v $
929 // Revision 1.5 2002/05/23 01:32:22 dtashley
930 // Missing fclose() corrected.
931 //
932 // Revision 1.4 2002/01/27 17:58:15 dtashley
933 // CRC32, other programs modified to work under new directory structure.
934 //
935 // Revision 1.3 2001/07/26 23:42:15 dtashley
936 // Minor documentation touchups.
937 //
938 // Revision 1.2 2001/07/26 21:41:20 dtashley
939 // Completion of CRC32 utility, and the CRCHASHFUNCS module.
940 //
941 // Revision 1.1 2001/07/26 04:55:48 dtashley
942 // Addition of CRC32 and MD5 command-line utilities. Addition of
943 // software module to support CRC and HASH functions.
944 //**************************************************************************
945 // End of C_MAIN.C.

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