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Revision 42 - (show annotations) (download)
Fri Oct 14 01:50:00 2016 UTC (6 years, 5 months ago) by dashley
Original Path: projs/trunk/shared_source/tclxtens/crchashextns.c
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Move shared source code to commonize.
1 /* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/tclxtens/crchashextns.c,v 1.2 2001/07/26 23:18:07 dtashley Exp $ */
2
3 //--------------------------------------------------------------------------------
4 //Copyright 2001 David T. Ashley
5 //-------------------------------------------------------------------------------------------------
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8 //-------------------------------------------------------------------------------------------------
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630 //
631 // How to Apply These Terms to Your New Programs
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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
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636 //
637 // To do so, attach the following notices to the program. It is safest
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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 //
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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
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649 //
650 // This program is distributed in the hope that it will be useful,
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670 //might be different; for a GUI interface, you would use an "about box".
671 //
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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 /* IJS_SM_FILE_PUBLIC */
686
687 #define MODULE_CRCHASHEXTNS
688
689 #include <string.h>
690
691 #include "tcl.h"
692 #include "tcldecls.h"
693
694 #include "crchashextns.h"
695 #include "crchashfuncs.h"
696
697 #include "strfuncs.h"
698 #include "tclalloc.h"
699
700
701 //Procedure called when the "crc32" command is encountered in a Tcl script.
702 //
703 int CRCHASHEXTNS_Crc32extnCommand(ClientData dummy,
704 Tcl_Interp *interp,
705 int objc,
706 Tcl_Obj *objv[])
707 {
708 Tcl_Obj *rv;
709 //Value that will be returned.
710 Tcl_Obj *block_obj;
711 //Used for file reads.
712 char buffer[11];
713 //Space for "0x" followed by 8 hex chars and terminator.
714 struct CRCHASHFUNCS_Crc32StateStruct crc_state;
715 //CRC state structure, internals nominally known and accessible to another
716 //another software module.
717 unsigned long crc;
718 //Calculated CRC.
719 unsigned long bytearraysize;
720 //Size of block allocated or portion used.
721 char *bytearrayptr;
722 //Pointer to array of bytes.
723 char *fname;
724 //File name specified.
725 char *blockbuf;
726 //Pointer to array of bytes.
727 Tcl_Channel chan;
728 //Channel opened using the Tcl libraries.
729 int return_code, return_code_b;
730 //Return codes from Tcl library functions.
731 int loop_exit_flag;
732 //Looping exit flag.
733 int chars_read;
734 //Number of characters read (i.e. for short read).
735 int block_obj_n;
736
737
738 if (objc < 2 || objc > 3)
739 {
740 Tcl_WrongNumArgs(interp,
741 1,
742 objv,
743 "?-string? filename_or_string_value");
744
745 return TCL_ERROR;
746 }
747 else if (objc == 2)
748 {
749 //Be sure that the internal crc table has been built. This function
750 //also returns a table correctness code. Error out severely if the
751 //CRC module believes its internal data has been corrupted.
752 if (!CRCHASHFUNCS_Crc32TableCheck())
753 {
754 //Serious internal error. Error out.
755
756 //Create the return object.
757 rv = Tcl_NewStringObj("CRCHASHEXTNS.C: Serious internal error: CRC-32 lookup table corrupted.", -1);
758
759 //Set the return value to be the error message.
760 Tcl_SetObjResult(interp, rv);
761
762 //Error return.
763 return TCL_ERROR;
764 }
765
766 //We need to open a channel, run it through the CRC algorithm, and
767 //return results.
768
769 //Get the string representation of the object.
770 fname = Tcl_GetString(objv[1]);
771
772 //Attempt to open a file channel. The error information, if any,
773 //will be placed in the interpreter's state.
774 chan = Tcl_OpenFileChannel(interp, fname, "r", 0);
775
776 //There is the possibility that the channel could not be opened
777 //successfully. If there was an error, error out.
778 if (!chan)
779 {
780 //Create the return object.
781 rv = Tcl_NewStringObj("crc32: Tcl_OpenFileChannel() failure on file name: ", -1);
782
783 //Tack on the offensive argument.
784 Tcl_AppendToObj(rv, fname, -1);
785
786 //Set the return value to be the error message.
787 Tcl_SetObjResult(interp, rv);
788
789 //Error return.
790 return TCL_ERROR;
791 }
792
793 //Try to set the channel encoding to binary and record the return code.
794 return_code = Tcl_SetChannelOption(interp, chan, "-encoding", "binary");
795
796 //Try to set the channel translation mode to binary and record the return
797 //code.
798 if (return_code == TCL_OK)
799 return_code_b = Tcl_SetChannelOption(interp, chan, "-translation", "binary");
800
801 //If the attempt to set the channel encoding or translation
802 //didn't go well, error out. Must also try to chose the channel because
803 //it was successfully opened.
804 if ((return_code != TCL_OK) || (return_code_b != TCL_OK))
805 {
806 //Try to close the channel. "interp" not supplied so as not
807 //to overwrite error info.
808 Tcl_Close(NULL, chan);
809
810 //Create the return object.
811 rv = Tcl_NewStringObj("crc32: Tcl_SetChannelOption() failure.", -1);
812
813 //Set the return value to be the error message.
814 Tcl_SetObjResult(interp, rv);
815
816 //Error return.
817 return TCL_ERROR;
818 }
819
820 //Allocate the object to hold the block buffer. I've examined the
821 //function, and cannot do it with with a NULL pointer. Must instead
822 //allocate SOMETHING, although it will be destroyed immediately on
823 //the first read. This will have reference count zero.
824 block_obj = Tcl_NewByteArrayObj("Trash", 5);
825
826 //Calculate the CRC. The essential process is to keep reading
827 //and adding to the CRC until end of file.
828 //Open and initialize the necessary structure.
829 CRCHASHFUNCS_Crc32StateStructOpen(&crc_state);
830
831 loop_exit_flag = 0;
832
833 do
834 {
835 //Grab as many chars as possible, up to 65536 of them.
836 //65536 was chosen because this is large enough for great
837 //performance, but small enough that it won't make a significant
838 //virtual memory impact.
839 chars_read = Tcl_ReadChars(chan, block_obj, 65536, 0);
840
841 //If the characters read shows as <0, this is an error
842 //condition. Trap.
843 if (chars_read < 0)
844 {
845 //Try to close the channel. "interp" not supplied so as not
846 //to overwrite error info.
847 Tcl_Close(NULL, chan);
848
849 //Deallocate the buffer used to accept block file reads. Because the
850 //creation process set the reference count to zero, a single
851 //decrement will destroy the object.
852 Tcl_DecrRefCount(block_obj);
853
854 //Create the return object.
855 rv = Tcl_NewStringObj("crc32: Tcl_ReadChars() failure.", -1);
856
857 //Set the return value to be the error message.
858 Tcl_SetObjResult(interp, rv);
859
860 //Error return.
861 return TCL_ERROR;
862 }
863
864 //Obtain a pointer to the binary block that was read.
865 blockbuf = Tcl_GetByteArrayFromObj(block_obj, &block_obj_n);
866
867 //Add to the CRC for those chars read. Skip the zero case.
868 if (block_obj_n > 0)
869 {
870 CRCHASHFUNCS_Crc32StateStructAddData(&crc_state,
871 blockbuf,
872 block_obj_n);
873 }
874
875 //We want to exit if EOF is true. A short read would
876 //also be an indication, but short read should imply
877 //EOF, so should not test both.
878 return_code = Tcl_Eof(chan);
879 loop_exit_flag = (return_code != 0);
880 } while(!loop_exit_flag);
881
882 //Extract the CRC.
883 crc = CRCHASHFUNCS_Crc32Extract(&crc_state);
884
885 //Postprocess the structure.
886 CRCHASHFUNCS_Crc32StateStructClose(&crc_state);
887
888 //Close the channel.
889 return_code = Tcl_Close(interp, chan);
890
891 //If there was an error closing the channel, error out.
892 if (return_code != TCL_OK)
893 {
894 //Create the return object.
895 rv = Tcl_NewStringObj("crc32: Tcl_Close() failure.", -1);
896
897 //Set the return value to be the error message.
898 Tcl_SetObjResult(interp, rv);
899
900 //Error return.
901 return TCL_ERROR;
902 }
903
904 //Deallocate the buffer used to accept block file reads. Because the
905 //creation process set the reference count to zero, a single
906 //decrement will destroy the object.
907 Tcl_DecrRefCount(block_obj);
908
909 //Return the CRC to the caller. No detectable errors
910 //are possible at this point.
911
912 //Convert the long integer to a hexadecimal representation.
913 Strfuncs_UlToHexString(crc, buffer+2, 1);
914
915 //Stuff the leading characters of the hexadecimal representation.
916 buffer[0] = '0';
917 buffer[1] = 'x';
918
919 //Stuff the string terminator.
920 buffer[10] = 0;
921
922 //Create the return object.
923 rv = Tcl_NewStringObj(buffer, -1);
924
925 //Set the return value to be the hexadecimal representation of the
926 //CRC.
927 Tcl_SetObjResult(interp, rv);
928
929 //Everything went well, return the OK code.
930 return TCL_OK;
931 }
932 else /* if (objc == 3) */
933 {
934 //The second parameter positively must be "-string" or a substring
935 //of that. At present, there are no competing option flags, so
936 //a simple substring lookup will handle it.
937 //Yank the string pointer.
938 bytearrayptr = Tcl_GetString(objv[1]);
939
940 //If not a substring, error out.
941 if ((strlen(bytearrayptr)<2) || !Strfuncs_IsSubstring(bytearrayptr, "-string"))
942 {
943 //Create the return object.
944 rv = Tcl_NewStringObj("crc32: Unrecognized switch: ", -1);
945
946 //Tack on the offensive argument.
947 Tcl_AppendToObj(rv, bytearrayptr, -1);
948
949 //Set the return value to be the error message.
950 Tcl_SetObjResult(interp, rv);
951
952 //Error return.
953 return TCL_ERROR;
954 }
955
956 //Convert the last parameter to its byte representation and get a
957 //pointer to this representation and the length. This was the
958 //library call that Ajuba recommended.
959 bytearrayptr = Tcl_GetByteArrayFromObj(objv[2], &bytearraysize);
960
961 //Be sure that the internal crc table has been built. This function
962 //also returns a table correctness code. Error out severely if the
963 //CRC module believes its internal data has been corrupted.
964 if (!CRCHASHFUNCS_Crc32TableCheck())
965 {
966 //Serious internal error. Error out.
967
968 //Create the return object.
969 rv = Tcl_NewStringObj("CRCHASHEXTNS.C: Serious internal error: CRC-32 lookup table corrupted.", -1);
970
971 //Set the return value to be the error message.
972 Tcl_SetObjResult(interp, rv);
973
974 //Error return.
975 return TCL_ERROR;
976 }
977
978 //Open and initialize the necessary structure.
979 CRCHASHFUNCS_Crc32StateStructOpen(&crc_state);
980
981 //Process the string.
982 CRCHASHFUNCS_Crc32StateStructAddData(&crc_state,
983 bytearrayptr,
984 bytearraysize);
985 //Extract the CRC.
986 crc = CRCHASHFUNCS_Crc32Extract(&crc_state);
987
988 //Postprocess the structure.
989 CRCHASHFUNCS_Crc32StateStructClose(&crc_state);
990
991 //Convert the long integer to a hexadecimal representation.
992 Strfuncs_UlToHexString(crc, buffer+2, 1);
993
994 //Stuff the leading characters of the hexadecimal representation.
995 buffer[0] = '0';
996 buffer[1] = 'x';
997
998 //Stuff the string terminator.
999 buffer[10] = 0;
1000
1001 //Create the return object.
1002 rv = Tcl_NewStringObj(buffer, -1);
1003
1004 //Set the return value to be the hexadecimal representation of the
1005 //CRC.
1006 Tcl_SetObjResult(interp, rv);
1007
1008 //Everything went well, return the OK code.
1009 return TCL_OK;
1010 }
1011 }
1012
1013
1014 //Performs initial registration to the hash table.
1015 //
1016 void CRCHASHEXTNS_Crc32extnInit(Tcl_Interp *interp)
1017 {
1018 //Register a command named "crc32".
1019 Tcl_CreateObjCommand(interp,
1020 "crc32",
1021 (Tcl_ObjCmdProc *)CRCHASHEXTNS_Crc32extnCommand,
1022 NULL,
1023 NULL);
1024 }
1025
1026
1027 //Returns version control string for file.
1028 //
1029 const char *CRCHASHEXTNS_cvcinfo(void)
1030 {
1031 return ("$Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/tclxtens/crchashextns.c,v 1.2 2001/07/26 23:18:07 dtashley Exp $");
1032 }
1033
1034
1035 //Returns version control string for associated .H file.
1036 //
1037 const char *CRCHASHEXTNS_hvcinfo(void)
1038 {
1039 return (CRCHASHEXTNS_H_VERSION);
1040 }
1041
1042
1043 // $Log: crchashextns.c,v $
1044 // Revision 1.2 2001/07/26 23:18:07 dtashley
1045 // Swap out of CRC modules and extensions.
1046 //
1047 //End of CRCHASHEXTNS.C

dashley@gmail.com
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