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checksum.c (190207) checksum.c (214478)
1/*
2 * Copyright (c) 1998-2006 The TCPDUMP project
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that: (1) source code
6 * distributions retain the above copyright notice and this paragraph
7 * in its entirety, and (2) distributions including binary code include
8 * the above copyright notice and this paragraph in its entirety in

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26#include "config.h"
27#endif
28
29#include <tcpdump-stdinc.h>
30
31#include <stdio.h>
32#include <stdlib.h>
33#include <string.h>
1/*
2 * Copyright (c) 1998-2006 The TCPDUMP project
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that: (1) source code
6 * distributions retain the above copyright notice and this paragraph
7 * in its entirety, and (2) distributions including binary code include
8 * the above copyright notice and this paragraph in its entirety in

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26#include "config.h"
27#endif
28
29#include <tcpdump-stdinc.h>
30
31#include <stdio.h>
32#include <stdlib.h>
33#include <string.h>
34#include <assert.h>
34
35#include "interface.h"
36
35
36#include "interface.h"
37
37#define CRC10_POLYNOMIAL 0x633
38static u_int16_t crc10_table[256];
38/*
39 * CRC-10 table generated using the following Python snippet:
39
40
41import sys
42
43crc_table = []
44for i in range(256):
45 accum = i << 2
46 for j in range(8):
47 accum <<= 1
48 if accum & 0x400:
49 accum ^= 0x633
50 crc_table.append(accum)
51
52for i in range(len(crc_table)/8):
53 for j in range(8):
54 sys.stdout.write("0x%04x, " % crc_table[i*8+j])
55 sys.stdout.write("\n")
56
57 */
58static const u_int16_t crc10_table[256] =
59{
60 0x0000, 0x0233, 0x0255, 0x0066, 0x0299, 0x00aa, 0x00cc, 0x02ff,
61 0x0301, 0x0132, 0x0154, 0x0367, 0x0198, 0x03ab, 0x03cd, 0x01fe,
62 0x0031, 0x0202, 0x0264, 0x0057, 0x02a8, 0x009b, 0x00fd, 0x02ce,
63 0x0330, 0x0103, 0x0165, 0x0356, 0x01a9, 0x039a, 0x03fc, 0x01cf,
64 0x0062, 0x0251, 0x0237, 0x0004, 0x02fb, 0x00c8, 0x00ae, 0x029d,
65 0x0363, 0x0150, 0x0136, 0x0305, 0x01fa, 0x03c9, 0x03af, 0x019c,
66 0x0053, 0x0260, 0x0206, 0x0035, 0x02ca, 0x00f9, 0x009f, 0x02ac,
67 0x0352, 0x0161, 0x0107, 0x0334, 0x01cb, 0x03f8, 0x039e, 0x01ad,
68 0x00c4, 0x02f7, 0x0291, 0x00a2, 0x025d, 0x006e, 0x0008, 0x023b,
69 0x03c5, 0x01f6, 0x0190, 0x03a3, 0x015c, 0x036f, 0x0309, 0x013a,
70 0x00f5, 0x02c6, 0x02a0, 0x0093, 0x026c, 0x005f, 0x0039, 0x020a,
71 0x03f4, 0x01c7, 0x01a1, 0x0392, 0x016d, 0x035e, 0x0338, 0x010b,
72 0x00a6, 0x0295, 0x02f3, 0x00c0, 0x023f, 0x000c, 0x006a, 0x0259,
73 0x03a7, 0x0194, 0x01f2, 0x03c1, 0x013e, 0x030d, 0x036b, 0x0158,
74 0x0097, 0x02a4, 0x02c2, 0x00f1, 0x020e, 0x003d, 0x005b, 0x0268,
75 0x0396, 0x01a5, 0x01c3, 0x03f0, 0x010f, 0x033c, 0x035a, 0x0169,
76 0x0188, 0x03bb, 0x03dd, 0x01ee, 0x0311, 0x0122, 0x0144, 0x0377,
77 0x0289, 0x00ba, 0x00dc, 0x02ef, 0x0010, 0x0223, 0x0245, 0x0076,
78 0x01b9, 0x038a, 0x03ec, 0x01df, 0x0320, 0x0113, 0x0175, 0x0346,
79 0x02b8, 0x008b, 0x00ed, 0x02de, 0x0021, 0x0212, 0x0274, 0x0047,
80 0x01ea, 0x03d9, 0x03bf, 0x018c, 0x0373, 0x0140, 0x0126, 0x0315,
81 0x02eb, 0x00d8, 0x00be, 0x028d, 0x0072, 0x0241, 0x0227, 0x0014,
82 0x01db, 0x03e8, 0x038e, 0x01bd, 0x0342, 0x0171, 0x0117, 0x0324,
83 0x02da, 0x00e9, 0x008f, 0x02bc, 0x0043, 0x0270, 0x0216, 0x0025,
84 0x014c, 0x037f, 0x0319, 0x012a, 0x03d5, 0x01e6, 0x0180, 0x03b3,
85 0x024d, 0x007e, 0x0018, 0x022b, 0x00d4, 0x02e7, 0x0281, 0x00b2,
86 0x017d, 0x034e, 0x0328, 0x011b, 0x03e4, 0x01d7, 0x01b1, 0x0382,
87 0x027c, 0x004f, 0x0029, 0x021a, 0x00e5, 0x02d6, 0x02b0, 0x0083,
88 0x012e, 0x031d, 0x037b, 0x0148, 0x03b7, 0x0184, 0x01e2, 0x03d1,
89 0x022f, 0x001c, 0x007a, 0x0249, 0x00b6, 0x0285, 0x02e3, 0x00d0,
90 0x011f, 0x032c, 0x034a, 0x0179, 0x0386, 0x01b5, 0x01d3, 0x03e0,
91 0x021e, 0x002d, 0x004b, 0x0278, 0x0087, 0x02b4, 0x02d2, 0x00e1
92};
93
40static void
41init_crc10_table(void)
42{
94static void
95init_crc10_table(void)
96{
97#define CRC10_POLYNOMIAL 0x633
43 register int i, j;
44 register u_int16_t accum;
98 register int i, j;
99 register u_int16_t accum;
100 u_int16_t verify_crc10_table[256];
45
46 for ( i = 0; i < 256; i++ )
47 {
48 accum = ((unsigned short) i << 2);
49 for ( j = 0; j < 8; j++ )
50 {
51 if ((accum <<= 1) & 0x400) accum ^= CRC10_POLYNOMIAL;
52 }
101
102 for ( i = 0; i < 256; i++ )
103 {
104 accum = ((unsigned short) i << 2);
105 for ( j = 0; j < 8; j++ )
106 {
107 if ((accum <<= 1) & 0x400) accum ^= CRC10_POLYNOMIAL;
108 }
53 crc10_table[i] = accum;
109 verify_crc10_table[i] = accum;
54 }
110 }
55 return;
111 assert(memcmp(verify_crc10_table,
112 crc10_table,
113 sizeof(verify_crc10_table)) == 0);
114#undef CRC10_POLYNOMIAL
56}
57
58u_int16_t
59verify_crc10_cksum(u_int16_t accum, const u_char *p, int length)
60{
61 register int i;
62
63 for ( i = 0; i < length; i++ )

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116
117u_int16_t
118verify_crc10_cksum(u_int16_t accum, const u_char *p, int length)
119{
120 register int i;
121
122 for ( i = 0; i < length; i++ )

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