blob: 3c1ae57ae4b78c3872af1bbeac7c8dc92a697036 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
#include "lzp.h"
void initTable16(unsigned short* table) {
int i, j;
unsigned short crc, c;
for (i=0; i<256; i++) {
crc = 0;
c = (unsigned short) i;
for (j=0; j<8; j++) {
if ( (crc ^ c) & 0x0001 )
crc = ( crc >> 1 ) ^ 0xA001;
else
crc = crc >> 1;
c = c >> 1;
}
table[i] = crc;
}
}
void initTable32(unsigned int* table) {
int i,j;
unsigned int crcVal;
for(i=0; i<256; i++) {
crcVal = i;
for(j=0; j<8; j++) {
if (crcVal&0x00000001L)
crcVal = (crcVal>>1)^0xEDB88320L;
else
crcVal = crcVal>>1;
}
table[i] = crcVal;
}
}
unsigned short lzCRC16(const void* buff, int bytes, unsigned short crc) {
int i;
unsigned short tmp, short_c;
unsigned short crcTable[256];
initTable16(crcTable);
for(i=0; i<bytes; i++) {
short_c = 0x00ff & (unsigned short)((const unsigned char*)buff)[i];
tmp = crc ^ short_c;
crc = (crc >> 8) ^ crcTable[tmp&0xff];
}
return(crc);
}
unsigned int lzCRC32(const void* buff, int bytes, unsigned int crc) {
int i;
const unsigned char* byteBuff = (const unsigned char*)buff;
unsigned int byte;
unsigned int crcTable[256];
initTable32(crcTable);
for(i=0; i<bytes; i++) {
byte = 0x000000ffL&(unsigned int)byteBuff[i];
crc = (crc>>8)^crcTable[(crc^byte)&0xff];
}
return(crc^0xFFFFFFFF);
}
|
