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39 #include "sim/host.hh"
40 #include "base/crc.hh"
42 #define ETHER_CRC_POLY_LE 0xedb88320
43 #define ETHER_CRC_POLY_BE 0x04c11db6
47 * This is for reference. We have a table-driven version
48 * of the little-endian crc32 generator, which is faster
49 * than the double-loop.
52 crc32le(const uint8_t *buf
, size_t len
)
54 uint32_t c
, crc
, carry
;
57 crc
= 0xffffffffU
; /* initial value */
59 for (i
= 0; i
< len
; i
++) {
61 for (j
= 0; j
< 8; j
++) {
62 carry
= ((crc
& 0x01) ? 1 : 0) ^ (c
& 0x01);
66 crc
= (crc
^ ETHER_CRC_POLY_LE
);
74 crc32le(const uint8_t *buf
, size_t len
)
76 static const uint32_t crctab
[] = {
77 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
78 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
79 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
80 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
85 crc
= 0xffffffffU
; /* initial value */
87 for (i
= 0; i
< len
; i
++) {
89 crc
= (crc
>> 4) ^ crctab
[crc
& 0xf];
90 crc
= (crc
>> 4) ^ crctab
[crc
& 0xf];
98 crc32be(const uint8_t *buf
, size_t len
)
100 uint32_t c
, crc
, carry
;
103 crc
= 0xffffffffU
; /* initial value */
105 for (i
= 0; i
< len
; i
++) {
107 for (j
= 0; j
< 8; j
++) {
108 carry
= ((crc
& 0x80000000U
) ? 1 : 0) ^ (c
& 0x01);
112 crc
= (crc
^ ETHER_CRC_POLY_BE
) | carry
;