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Revision 42 - (show annotations) (download)
Fri Oct 14 01:50:00 2016 UTC (7 years, 4 months ago) by dashley
File MIME type: text/plain
File size: 49150 byte(s)
Move shared source code to commonize.
1 /* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/c_datd/crchashfuncs.c,v 1.3 2001/07/26 21:41:21 dtashley Exp $ */
2 //--------------------------------------------------------------------------------
3 //Copyright 2001 David T. Ashley
4 //-------------------------------------------------------------------------------------------------
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678 //may consider it more useful to permit linking proprietary applications with
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680 //Public License instead of this License. But first, please read
681 //<http://www.gnu.org/philosophy/why-not-lgpl.html>.
682 //-------------------------------------------------------------------------------------------------
683 //--------------------------------------------------------------------------------
684 #define MODULE_CRCHASHFUNCS
685
686 #include <assert.h>
687 #include <stdio.h>
688 #include <string.h>
689
690 #include "crchashfuncs.h"
691
692
693 //This is the data table used to generate CRC-32 values. The code to
694 //generate these values isn't reproduced here (it was discarded after
695 //the values were generated), but this code originally came from a
696 //web page by Richard A. Ellingson. I do not at this time understand
697 //the math behind the generation or usage of this table.
698 static const unsigned CRCHASHFUNCS_crc32tab[256] =
699 {
700 /* [000] */ 0x00000000,
701 /* [001] */ 0x77073096,
702 /* [002] */ 0xEE0E612C,
703 /* [003] */ 0x990951BA,
704 /* [004] */ 0x076DC419,
705 /* [005] */ 0x706AF48F,
706 /* [006] */ 0xE963A535,
707 /* [007] */ 0x9E6495A3,
708 /* [008] */ 0x0EDB8832,
709 /* [009] */ 0x79DCB8A4,
710 /* [010] */ 0xE0D5E91E,
711 /* [011] */ 0x97D2D988,
712 /* [012] */ 0x09B64C2B,
713 /* [013] */ 0x7EB17CBD,
714 /* [014] */ 0xE7B82D07,
715 /* [015] */ 0x90BF1D91,
716 /* [016] */ 0x1DB71064,
717 /* [017] */ 0x6AB020F2,
718 /* [018] */ 0xF3B97148,
719 /* [019] */ 0x84BE41DE,
720 /* [020] */ 0x1ADAD47D,
721 /* [021] */ 0x6DDDE4EB,
722 /* [022] */ 0xF4D4B551,
723 /* [023] */ 0x83D385C7,
724 /* [024] */ 0x136C9856,
725 /* [025] */ 0x646BA8C0,
726 /* [026] */ 0xFD62F97A,
727 /* [027] */ 0x8A65C9EC,
728 /* [028] */ 0x14015C4F,
729 /* [029] */ 0x63066CD9,
730 /* [030] */ 0xFA0F3D63,
731 /* [031] */ 0x8D080DF5,
732 /* [032] */ 0x3B6E20C8,
733 /* [033] */ 0x4C69105E,
734 /* [034] */ 0xD56041E4,
735 /* [035] */ 0xA2677172,
736 /* [036] */ 0x3C03E4D1,
737 /* [037] */ 0x4B04D447,
738 /* [038] */ 0xD20D85FD,
739 /* [039] */ 0xA50AB56B,
740 /* [040] */ 0x35B5A8FA,
741 /* [041] */ 0x42B2986C,
742 /* [042] */ 0xDBBBC9D6,
743 /* [043] */ 0xACBCF940,
744 /* [044] */ 0x32D86CE3,
745 /* [045] */ 0x45DF5C75,
746 /* [046] */ 0xDCD60DCF,
747 /* [047] */ 0xABD13D59,
748 /* [048] */ 0x26D930AC,
749 /* [049] */ 0x51DE003A,
750 /* [050] */ 0xC8D75180,
751 /* [051] */ 0xBFD06116,
752 /* [052] */ 0x21B4F4B5,
753 /* [053] */ 0x56B3C423,
754 /* [054] */ 0xCFBA9599,
755 /* [055] */ 0xB8BDA50F,
756 /* [056] */ 0x2802B89E,
757 /* [057] */ 0x5F058808,
758 /* [058] */ 0xC60CD9B2,
759 /* [059] */ 0xB10BE924,
760 /* [060] */ 0x2F6F7C87,
761 /* [061] */ 0x58684C11,
762 /* [062] */ 0xC1611DAB,
763 /* [063] */ 0xB6662D3D,
764 /* [064] */ 0x76DC4190,
765 /* [065] */ 0x01DB7106,
766 /* [066] */ 0x98D220BC,
767 /* [067] */ 0xEFD5102A,
768 /* [068] */ 0x71B18589,
769 /* [069] */ 0x06B6B51F,
770 /* [070] */ 0x9FBFE4A5,
771 /* [071] */ 0xE8B8D433,
772 /* [072] */ 0x7807C9A2,
773 /* [073] */ 0x0F00F934,
774 /* [074] */ 0x9609A88E,
775 /* [075] */ 0xE10E9818,
776 /* [076] */ 0x7F6A0DBB,
777 /* [077] */ 0x086D3D2D,
778 /* [078] */ 0x91646C97,
779 /* [079] */ 0xE6635C01,
780 /* [080] */ 0x6B6B51F4,
781 /* [081] */ 0x1C6C6162,
782 /* [082] */ 0x856530D8,
783 /* [083] */ 0xF262004E,
784 /* [084] */ 0x6C0695ED,
785 /* [085] */ 0x1B01A57B,
786 /* [086] */ 0x8208F4C1,
787 /* [087] */ 0xF50FC457,
788 /* [088] */ 0x65B0D9C6,
789 /* [089] */ 0x12B7E950,
790 /* [090] */ 0x8BBEB8EA,
791 /* [091] */ 0xFCB9887C,
792 /* [092] */ 0x62DD1DDF,
793 /* [093] */ 0x15DA2D49,
794 /* [094] */ 0x8CD37CF3,
795 /* [095] */ 0xFBD44C65,
796 /* [096] */ 0x4DB26158,
797 /* [097] */ 0x3AB551CE,
798 /* [098] */ 0xA3BC0074,
799 /* [099] */ 0xD4BB30E2,
800 /* [100] */ 0x4ADFA541,
801 /* [101] */ 0x3DD895D7,
802 /* [102] */ 0xA4D1C46D,
803 /* [103] */ 0xD3D6F4FB,
804 /* [104] */ 0x4369E96A,
805 /* [105] */ 0x346ED9FC,
806 /* [106] */ 0xAD678846,
807 /* [107] */ 0xDA60B8D0,
808 /* [108] */ 0x44042D73,
809 /* [109] */ 0x33031DE5,
810 /* [110] */ 0xAA0A4C5F,
811 /* [111] */ 0xDD0D7CC9,
812 /* [112] */ 0x5005713C,
813 /* [113] */ 0x270241AA,
814 /* [114] */ 0xBE0B1010,
815 /* [115] */ 0xC90C2086,
816 /* [116] */ 0x5768B525,
817 /* [117] */ 0x206F85B3,
818 /* [118] */ 0xB966D409,
819 /* [119] */ 0xCE61E49F,
820 /* [120] */ 0x5EDEF90E,
821 /* [121] */ 0x29D9C998,
822 /* [122] */ 0xB0D09822,
823 /* [123] */ 0xC7D7A8B4,
824 /* [124] */ 0x59B33D17,
825 /* [125] */ 0x2EB40D81,
826 /* [126] */ 0xB7BD5C3B,
827 /* [127] */ 0xC0BA6CAD,
828 /* [128] */ 0xEDB88320,
829 /* [129] */ 0x9ABFB3B6,
830 /* [130] */ 0x03B6E20C,
831 /* [131] */ 0x74B1D29A,
832 /* [132] */ 0xEAD54739,
833 /* [133] */ 0x9DD277AF,
834 /* [134] */ 0x04DB2615,
835 /* [135] */ 0x73DC1683,
836 /* [136] */ 0xE3630B12,
837 /* [137] */ 0x94643B84,
838 /* [138] */ 0x0D6D6A3E,
839 /* [139] */ 0x7A6A5AA8,
840 /* [140] */ 0xE40ECF0B,
841 /* [141] */ 0x9309FF9D,
842 /* [142] */ 0x0A00AE27,
843 /* [143] */ 0x7D079EB1,
844 /* [144] */ 0xF00F9344,
845 /* [145] */ 0x8708A3D2,
846 /* [146] */ 0x1E01F268,
847 /* [147] */ 0x6906C2FE,
848 /* [148] */ 0xF762575D,
849 /* [149] */ 0x806567CB,
850 /* [150] */ 0x196C3671,
851 /* [151] */ 0x6E6B06E7,
852 /* [152] */ 0xFED41B76,
853 /* [153] */ 0x89D32BE0,
854 /* [154] */ 0x10DA7A5A,
855 /* [155] */ 0x67DD4ACC,
856 /* [156] */ 0xF9B9DF6F,
857 /* [157] */ 0x8EBEEFF9,
858 /* [158] */ 0x17B7BE43,
859 /* [159] */ 0x60B08ED5,
860 /* [160] */ 0xD6D6A3E8,
861 /* [161] */ 0xA1D1937E,
862 /* [162] */ 0x38D8C2C4,
863 /* [163] */ 0x4FDFF252,
864 /* [164] */ 0xD1BB67F1,
865 /* [165] */ 0xA6BC5767,
866 /* [166] */ 0x3FB506DD,
867 /* [167] */ 0x48B2364B,
868 /* [168] */ 0xD80D2BDA,
869 /* [169] */ 0xAF0A1B4C,
870 /* [170] */ 0x36034AF6,
871 /* [171] */ 0x41047A60,
872 /* [172] */ 0xDF60EFC3,
873 /* [173] */ 0xA867DF55,
874 /* [174] */ 0x316E8EEF,
875 /* [175] */ 0x4669BE79,
876 /* [176] */ 0xCB61B38C,
877 /* [177] */ 0xBC66831A,
878 /* [178] */ 0x256FD2A0,
879 /* [179] */ 0x5268E236,
880 /* [180] */ 0xCC0C7795,
881 /* [181] */ 0xBB0B4703,
882 /* [182] */ 0x220216B9,
883 /* [183] */ 0x5505262F,
884 /* [184] */ 0xC5BA3BBE,
885 /* [185] */ 0xB2BD0B28,
886 /* [186] */ 0x2BB45A92,
887 /* [187] */ 0x5CB36A04,
888 /* [188] */ 0xC2D7FFA7,
889 /* [189] */ 0xB5D0CF31,
890 /* [190] */ 0x2CD99E8B,
891 /* [191] */ 0x5BDEAE1D,
892 /* [192] */ 0x9B64C2B0,
893 /* [193] */ 0xEC63F226,
894 /* [194] */ 0x756AA39C,
895 /* [195] */ 0x026D930A,
896 /* [196] */ 0x9C0906A9,
897 /* [197] */ 0xEB0E363F,
898 /* [198] */ 0x72076785,
899 /* [199] */ 0x05005713,
900 /* [200] */ 0x95BF4A82,
901 /* [201] */ 0xE2B87A14,
902 /* [202] */ 0x7BB12BAE,
903 /* [203] */ 0x0CB61B38,
904 /* [204] */ 0x92D28E9B,
905 /* [205] */ 0xE5D5BE0D,
906 /* [206] */ 0x7CDCEFB7,
907 /* [207] */ 0x0BDBDF21,
908 /* [208] */ 0x86D3D2D4,
909 /* [209] */ 0xF1D4E242,
910 /* [210] */ 0x68DDB3F8,
911 /* [211] */ 0x1FDA836E,
912 /* [212] */ 0x81BE16CD,
913 /* [213] */ 0xF6B9265B,
914 /* [214] */ 0x6FB077E1,
915 /* [215] */ 0x18B74777,
916 /* [216] */ 0x88085AE6,
917 /* [217] */ 0xFF0F6A70,
918 /* [218] */ 0x66063BCA,
919 /* [219] */ 0x11010B5C,
920 /* [220] */ 0x8F659EFF,
921 /* [221] */ 0xF862AE69,
922 /* [222] */ 0x616BFFD3,
923 /* [223] */ 0x166CCF45,
924 /* [224] */ 0xA00AE278,
925 /* [225] */ 0xD70DD2EE,
926 /* [226] */ 0x4E048354,
927 /* [227] */ 0x3903B3C2,
928 /* [228] */ 0xA7672661,
929 /* [229] */ 0xD06016F7,
930 /* [230] */ 0x4969474D,
931 /* [231] */ 0x3E6E77DB,
932 /* [232] */ 0xAED16A4A,
933 /* [233] */ 0xD9D65ADC,
934 /* [234] */ 0x40DF0B66,
935 /* [235] */ 0x37D83BF0,
936 /* [236] */ 0xA9BCAE53,
937 /* [237] */ 0xDEBB9EC5,
938 /* [238] */ 0x47B2CF7F,
939 /* [239] */ 0x30B5FFE9,
940 /* [240] */ 0xBDBDF21C,
941 /* [241] */ 0xCABAC28A,
942 /* [242] */ 0x53B39330,
943 /* [243] */ 0x24B4A3A6,
944 /* [244] */ 0xBAD03605,
945 /* [245] */ 0xCDD70693,
946 /* [246] */ 0x54DE5729,
947 /* [247] */ 0x23D967BF,
948 /* [248] */ 0xB3667A2E,
949 /* [249] */ 0xC4614AB8,
950 /* [250] */ 0x5D681B02,
951 /* [251] */ 0x2A6F2B94,
952 /* [252] */ 0xB40BBE37,
953 /* [253] */ 0xC30C8EA1,
954 /* [254] */ 0x5A05DF1B,
955 /* [255] */ 0x2D02EF8D
956 };
957
958 //It is known that the XOR of all of the table values above is 0,
959 //and that the sum is 0xFFFFFF80. This is used to check the table
960 //for corruption on demand.
961 #define CRCHASHFUNCS_CRC32TABLE_XOR (0x00000000)
962 #define CRCHASHFUNCS_CRC32TABLE_SUM (0xFFFFFF80)
963
964
965 //Rotates an unsigned int left with wraparound.
966 static unsigned CRCHASHFUNCS_Crc32RotateLeftWithWrap(unsigned arg)
967 {
968 if (arg & 0x80000000)
969 {
970 arg <<= 1;
971 arg |= (unsigned)1;
972 }
973 else
974 {
975 arg <<= 1;
976 arg &= 0xFFFFFFFE;
977 }
978
979 return(arg);
980 }
981
982
983 //Appears to swap the bits in a data value, bit 0 for bit 7, bit 1
984 //for bit 6, etc. Obtained from the Internet (Richard A. Ellingson).
985 static unsigned CRCHASHFUNCS_Crc32Reflect(unsigned ref,
986 unsigned char ch)
987 {
988 unsigned i;
989 unsigned value;
990
991 value = 0;
992
993 for (i=1; i<((unsigned)(ch+1)); i++)
994 {
995 if (ref & 1)
996 {
997 value |= (1 << (ch-i));
998 }
999 ref >>= 1;
1000 }
1001
1002 return(value);
1003 }
1004
1005
1006 //Returns !=0 if the internal table is alright.
1007 int CRCHASHFUNCS_Crc32TableCheck(void)
1008 {
1009 int i;
1010 unsigned xor_val;
1011 unsigned sum_val;
1012
1013 xor_val = sum_val = 0;
1014
1015 for (i=0; i<256; i++)
1016 {
1017 xor_val ^= CRCHASHFUNCS_crc32tab[i];
1018 sum_val += CRCHASHFUNCS_crc32tab[i];
1019 }
1020
1021 return((xor_val == CRCHASHFUNCS_CRC32TABLE_XOR) &&
1022 (sum_val == CRCHASHFUNCS_CRC32TABLE_SUM));
1023 }
1024
1025
1026 //Initializes a CRC state struct. This will be added to, the CRC will be
1027 //extracted, and the data structure will finally be closed.
1028 void CRCHASHFUNCS_Crc32StateStructOpen(struct CRCHASHFUNCS_Crc32StateStruct *arg)
1029 {
1030 arg->crc = 0xFFFFFFFF;
1031 }
1032
1033
1034 //Adds data to the data structure.
1035 void CRCHASHFUNCS_Crc32StateStructAddData(struct CRCHASHFUNCS_Crc32StateStruct *arg,
1036 void *data,
1037 unsigned len)
1038 {
1039 assert(arg != NULL);
1040 assert(data != NULL);
1041
1042 while (len--)
1043 {
1044 arg->crc = (arg->crc >> 8) ^ CRCHASHFUNCS_crc32tab[((arg->crc & 0xFF) ^ *((unsigned char *)data)) & 0xFF];
1045 data = (unsigned char *)data + 1;
1046 }
1047 }
1048
1049
1050 unsigned CRCHASHFUNCS_Crc32Extract(struct CRCHASHFUNCS_Crc32StateStruct *arg)
1051 {
1052 assert(arg != NULL);
1053
1054 return(arg->crc ^ 0xFFFFFFFF);
1055 }
1056
1057
1058 void CRCHASHFUNCS_Crc32StateStructClose(struct CRCHASHFUNCS_Crc32StateStruct *arg)
1059 {
1060 assert(arg != NULL);
1061
1062 //Do nothing at this time.
1063 }
1064
1065
1066 //Returns version control string for file.
1067 //
1068 const char *CRCHASHFUNCS_cvcinfo(void)
1069 {
1070 return ("$Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/c_datd/crchashfuncs.c,v 1.3 2001/07/26 21:41:21 dtashley Exp $");
1071 }
1072
1073
1074 //Returns version control string for associated .H file.
1075 //
1076 const char *CRCHASHFUNCS_hvcinfo(void)
1077 {
1078 return (CRCHASHFUNCS_H_VERSION);
1079 }
1080
1081
1082 // $Log: crchashfuncs.c,v $
1083 // Revision 1.3 2001/07/26 21:41:21 dtashley
1084 // Completion of CRC32 utility, and the CRCHASHFUNCS module.
1085 //
1086 // Revision 1.2 2001/07/26 05:01:49 dtashley
1087 // Keyword expansion corrected.
1088 //
1089 // End of CRCHASHFUNCS.C.

dashley@gmail.com
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