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FossilOrigin-Name: 33e1ed226e6651e85e45bdc2f54c9e0b616d51b13ec76d2df0e01c22ded791e6
This commit is contained in:
7u83@mail.ru
2014-08-25 05:56:14 +00:00
parent 06210cb4fa
commit c1ffe70955
13 changed files with 170 additions and 38 deletions
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13
src/capwap/lw_checksum.c
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@ -21,11 +21,16 @@
/**
* Calculate the 16-bit checksum for LWAPP image data message
* elements with opcode 3 - used by Cisco also in CAPWAP
* (But it's not always correct, the real algo might be another)
*/
uint16_t lw_checksum(uint8_t * d, int len)
{
int i;
uint32_t cs = 0xffff;
// uint32_t cs = 0xffff;
if (len==0)
return 0xffff;
uint32_t cs = 0;
for (i = 0; i < len; i += 2) {
uint16_t w = d[i] << 8;
@ -36,5 +41,9 @@ uint16_t lw_checksum(uint8_t * d, int len)
cs += cs >> 16;
cs &= 0xffff;
}
return (uint16_t) cs;
return (uint16_t) cs&0xffff;
}