home *** CD-ROM | disk | FTP | other *** search
- /*
- * cksum --- Calculate file checksums and sizes (version 0.9.1)
- *
- * A POSIX (P1003,2/D11.2, 4.9) conformed utility
- * written by Q. Frank Xia.
- */
-
- /**************************************************************************
- * (C) Copyright Q. Frank Xia, Oct. 1992. All rights reserved. *
- * *
- * Permission to use and redistribute this software is hereby granted *
- * provided that the following conditions are met: *
- * 1. Source code redistribution must retain this statement. *
- * 2. Binary redistribution must reproduce this statement in the *
- * documentation provided with the distribution. *
- * 3. This software is provided by author Q. Frank Xia "as is". There *
- * are absolutely no warranties at all. The author is not responsible *
- * for any possible damages caused by using this software. *
- **************************************************************************/
-
- /*
- * To compile this program, do
- *
- * gcc -O -o cksum cksum.c
- *
- * Usage:
- *
- * cksum [file ...]
- *
- * The code segment between "#ifdef CRCTAB" and "#else" is the code
- * which calculates the "crctab". It is included for those who want
- * verify the correctness of the "crctab". To recreate the "crctab",
- * do following:
- *
- * gcc -O -DCRCTAB -o crctab cksum.c
- * crctab > crctab.h
- *
- * I'd like to point out that the crctab in the sample C-code in 4.9.10
- * Rationale of P1003.2/D11.2 is not consistent with the Generating
- * Polynomial defined in 4.9.2 of P1003.2/D11.2. In fact, the crctab
- * given there is a dummy one.
- *
- * This software is neither compatible with System V nor BSD "sum" program.
- * It is supposed to be conformed to P1003.2/D11.2 except foreign language
- * interface (4.9.5.3 of P1003.2/D11.2) support. Any single inconsistency
- * with the standard except (4.9.5.3) is a bug. Please send bug report to
- *
- * qx@math.columbia.edu
- *
- * -Q. Frank Xia, Oct. 1992.
- *
- * History:
- * 9-24-92: Version 0.9 is created.
- * 9-28-92: Version 0.9.1. A C-implement dependent bug caused by
- * ">>" (shift right) is fixed. And additional care has
- * been taken to make sure it works on any machine with
- * long int having at least 32 bits.
- */
-
- #ifdef CRCTAB
-
- #include <stdio.h>
-
- #define BIT(x) ( (unsigned long)1 << (x) )
- #define LBIT ( (unsigned long)1 << 31 )
-
- /*
- * The generating polynomial is
- *
- * 32 26 23 22 16 12 11 10 8 7 5 4 2 1
- * G(X)=X + X + X + X + X + X + X + X + X + X + X + X + X + X + 1
- *
- * The i bit in GEN is set if X^i is a summand of G(X) except X^32.
- */
- #define GEN (BIT(26)|BIT(23)|BIT(22)|BIT(16)|BIT(12)|BIT(11)|BIT(10)\
- |BIT(8) |BIT(7) |BIT(5) |BIT(4) |BIT(2) |BIT(1) |BIT(0));
-
- unsigned long r[8];
-
- void fill_r()
- {
- int i;
-
- r[0]=GEN;
- for (i=1; i < 8; i++)
- r[i] = (r[i-1] & LBIT) ? (r[i-1] << 1) ^ r[0] : r[i-1] << 1;
- }
-
- unsigned long remainder(int m)
- {
- unsigned long rem=0;
- int i;
-
- for (i=0; i < 8; i++)
- if ( BIT(i) & m ) rem=rem ^ r[i];
-
- return (rem & 0xFFFFFFFF); /* make it run on 64-bit machine */
- }
-
- void main()
- {
- int i;
-
- fill_r();
- printf("unsigned long crctab[256] = {\n 0x0");
- for (i=0; i < 51; i++) {
- printf(",\n 0x%08X, 0x%08X, 0x%08X, 0x%08X, 0x%08X",
- remainder(i*5+1), remainder(i*5+2), remainder(i*5+3),
- remainder(i*5+4), remainder(i*5+5));
- }
- printf("\n};\n");
- exit(0);
- }
-
- #else /* CRCTAB */
-
- #include <stdio.h>
-
- #define BUFLEN (1 << 16)
- #define VERSION "version 0.9.1"
-
- unsigned long crctab[256] = {
- 0x0,
- 0x04C11DB7, 0x09823B6E, 0x0D4326D9, 0x130476DC, 0x17C56B6B,
- 0x1A864DB2, 0x1E475005, 0x2608EDB8, 0x22C9F00F, 0x2F8AD6D6,
- 0x2B4BCB61, 0x350C9B64, 0x31CD86D3, 0x3C8EA00A, 0x384FBDBD,
- 0x4C11DB70, 0x48D0C6C7, 0x4593E01E, 0x4152FDA9, 0x5F15ADAC,
- 0x5BD4B01B, 0x569796C2, 0x52568B75, 0x6A1936C8, 0x6ED82B7F,
- 0x639B0DA6, 0x675A1011, 0x791D4014, 0x7DDC5DA3, 0x709F7B7A,
- 0x745E66CD, 0x9823B6E0, 0x9CE2AB57, 0x91A18D8E, 0x95609039,
- 0x8B27C03C, 0x8FE6DD8B, 0x82A5FB52, 0x8664E6E5, 0xBE2B5B58,
- 0xBAEA46EF, 0xB7A96036, 0xB3687D81, 0xAD2F2D84, 0xA9EE3033,
- 0xA4AD16EA, 0xA06C0B5D, 0xD4326D90, 0xD0F37027, 0xDDB056FE,
- 0xD9714B49, 0xC7361B4C, 0xC3F706FB, 0xCEB42022, 0xCA753D95,
- 0xF23A8028, 0xF6FB9D9F, 0xFBB8BB46, 0xFF79A6F1, 0xE13EF6F4,
- 0xE5FFEB43, 0xE8BCCD9A, 0xEC7DD02D, 0x34867077, 0x30476DC0,
- 0x3D044B19, 0x39C556AE, 0x278206AB, 0x23431B1C, 0x2E003DC5,
- 0x2AC12072, 0x128E9DCF, 0x164F8078, 0x1B0CA6A1, 0x1FCDBB16,
- 0x018AEB13, 0x054BF6A4, 0x0808D07D, 0x0CC9CDCA, 0x7897AB07,
- 0x7C56B6B0, 0x71159069, 0x75D48DDE, 0x6B93DDDB, 0x6F52C06C,
- 0x6211E6B5, 0x66D0FB02, 0x5E9F46BF, 0x5A5E5B08, 0x571D7DD1,
- 0x53DC6066, 0x4D9B3063, 0x495A2DD4, 0x44190B0D, 0x40D816BA,
- 0xACA5C697, 0xA864DB20, 0xA527FDF9, 0xA1E6E04E, 0xBFA1B04B,
- 0xBB60ADFC, 0xB6238B25, 0xB2E29692, 0x8AAD2B2F, 0x8E6C3698,
- 0x832F1041, 0x87EE0DF6, 0x99A95DF3, 0x9D684044, 0x902B669D,
- 0x94EA7B2A, 0xE0B41DE7, 0xE4750050, 0xE9362689, 0xEDF73B3E,
- 0xF3B06B3B, 0xF771768C, 0xFA325055, 0xFEF34DE2, 0xC6BCF05F,
- 0xC27DEDE8, 0xCF3ECB31, 0xCBFFD686, 0xD5B88683, 0xD1799B34,
- 0xDC3ABDED, 0xD8FBA05A, 0x690CE0EE, 0x6DCDFD59, 0x608EDB80,
- 0x644FC637, 0x7A089632, 0x7EC98B85, 0x738AAD5C, 0x774BB0EB,
- 0x4F040D56, 0x4BC510E1, 0x46863638, 0x42472B8F, 0x5C007B8A,
- 0x58C1663D, 0x558240E4, 0x51435D53, 0x251D3B9E, 0x21DC2629,
- 0x2C9F00F0, 0x285E1D47, 0x36194D42, 0x32D850F5, 0x3F9B762C,
- 0x3B5A6B9B, 0x0315D626, 0x07D4CB91, 0x0A97ED48, 0x0E56F0FF,
- 0x1011A0FA, 0x14D0BD4D, 0x19939B94, 0x1D528623, 0xF12F560E,
- 0xF5EE4BB9, 0xF8AD6D60, 0xFC6C70D7, 0xE22B20D2, 0xE6EA3D65,
- 0xEBA91BBC, 0xEF68060B, 0xD727BBB6, 0xD3E6A601, 0xDEA580D8,
- 0xDA649D6F, 0xC423CD6A, 0xC0E2D0DD, 0xCDA1F604, 0xC960EBB3,
- 0xBD3E8D7E, 0xB9FF90C9, 0xB4BCB610, 0xB07DABA7, 0xAE3AFBA2,
- 0xAAFBE615, 0xA7B8C0CC, 0xA379DD7B, 0x9B3660C6, 0x9FF77D71,
- 0x92B45BA8, 0x9675461F, 0x8832161A, 0x8CF30BAD, 0x81B02D74,
- 0x857130C3, 0x5D8A9099, 0x594B8D2E, 0x5408ABF7, 0x50C9B640,
- 0x4E8EE645, 0x4A4FFBF2, 0x470CDD2B, 0x43CDC09C, 0x7B827D21,
- 0x7F436096, 0x7200464F, 0x76C15BF8, 0x68860BFD, 0x6C47164A,
- 0x61043093, 0x65C52D24, 0x119B4BE9, 0x155A565E, 0x18197087,
- 0x1CD86D30, 0x029F3D35, 0x065E2082, 0x0B1D065B, 0x0FDC1BEC,
- 0x3793A651, 0x3352BBE6, 0x3E119D3F, 0x3AD08088, 0x2497D08D,
- 0x2056CD3A, 0x2D15EBE3, 0x29D4F654, 0xC5A92679, 0xC1683BCE,
- 0xCC2B1D17, 0xC8EA00A0, 0xD6AD50A5, 0xD26C4D12, 0xDF2F6BCB,
- 0xDBEE767C, 0xE3A1CBC1, 0xE760D676, 0xEA23F0AF, 0xEEE2ED18,
- 0xF0A5BD1D, 0xF464A0AA, 0xF9278673, 0xFDE69BC4, 0x89B8FD09,
- 0x8D79E0BE, 0x803AC667, 0x84FBDBD0, 0x9ABC8BD5, 0x9E7D9662,
- 0x933EB0BB, 0x97FFAD0C, 0xAFB010B1, 0xAB710D06, 0xA6322BDF,
- 0xA2F33668, 0xBCB4666D, 0xB8757BDA, 0xB5365D03, 0xB1F740B4
- };
-
- char *pgm, *buf;
-
- unsigned long cksum(FILE *inf, long *len)
- {
- unsigned long crc = 0;
- long count, length = 0;
- int i, notdone = 1;
- char *cp;
-
- while (notdone) {
- count=fread(buf, 1, BUFLEN, inf);
- cp=buf;
- for (i = 0; i++ < count;)
- crc = (crc << 8) ^ crctab[((crc >> 24) ^ *(cp++)) & 0xFF];
- length += count;
- if ( count < BUFLEN) {
- if ( ferror(inf) ) {
- *len = -1;
- return (~crc & 0xFFFFFFFF);
- }
- notdone = 0;
- }
- }
- *len = length;
- while ( length > 0 ) {
- crc = (crc << 8) ^ crctab[((crc >> 24) ^ length) & 0xFF];
- length >>= 8;
- }
-
- return (~crc & 0xFFFFFFFF);
- }
-
- void main(int argc, char **argv)
- {
- unsigned long crc;
- FILE *infile;
- int error=0;
- long size;
-
- if ( argc > 1 && *(argv[1]) == '-') {
- fprintf(stderr, "cksum (%s). ", VERSION);
- fprintf(stderr, "(C) Copyright Q. Frank Xia, 1992. All right reserved.\n");
- fprintf(stderr, "usage: cksum [file ...]\n");
- exit(1);
- }
- pgm=argv[0];
- buf = (char *) malloc(BUFLEN);
- if (!buf) {
- fprintf(stderr, "%s: allocate memory error\n", pgm);
- exit(1);
- }
-
- if (argc==1) {
- crc=cksum(stdin, &size);
- printf("%10u %8d\n", crc, size);
- exit(0);
- }
-
- while (--argc > 0) {
- infile=fopen(*(++argv), "rb");
- if (!infile) {
- error=1;
- fprintf(stderr, "%s: open file \'%s\' error\n", pgm, *argv);
- }
- else {
- crc=cksum(infile, &size);
- if (size < 0) {
- error=1;
- fprintf(stderr, "%s; read file \'%s\' error\n", pgm, *argv);
- }
- else
- printf("%10u %8d %s\n", crc, size, *argv);
- fclose(infile);
- }
- }
-
- if (error)
- exit(1);
-
- exit(0);
- }
-
- #endif /* CRCTAB */
-
-
-
-
-