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1 dashley 25 /* $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
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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.

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