diff options
| author | cinap_lenrek <cinap_lenrek@felloff.net> | 2022-09-18 10:40:46 +0000 |
|---|---|---|
| committer | cinap_lenrek <cinap_lenrek@felloff.net> | 2022-09-18 10:40:46 +0000 |
| commit | ada1920a0e4787d46402dcdc3e9f3ad3ddae7f0e (patch) | |
| tree | 2294759dfcc2dd71a9b6c68299df4b48f3194e97 /sys/src/9/ip | |
| parent | 892008af7ca37124d61f3833f800675f6aa77f6b (diff) | |
devip: less stupid hnputs_csum()
Diffstat (limited to 'sys/src/9/ip')
| -rw-r--r-- | sys/src/9/ip/ipaux.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/sys/src/9/ip/ipaux.c b/sys/src/9/ip/ipaux.c index 9f413ca0e..731176782 100644 --- a/sys/src/9/ip/ipaux.c +++ b/sys/src/9/ip/ipaux.c @@ -556,16 +556,17 @@ void hnputs_csum(void *p, ushort v, uchar *pcsum) { ulong csum; + ushort o; + csum = nhgets(pcsum)^0xFFFF; + o = nhgets(p); + hnputs(p, v); if(((uchar*)p - pcsum) & 1){ - hnputs_csum((uchar*)p-1, (nhgets((uchar*)p-1) & 0xFF00) | v>>8, pcsum); - hnputs_csum((uchar*)p+1, (nhgets((uchar*)p+1) & 0x00FF) | v<<8, pcsum); - return; + o = o << 8 | o >> 8; + v = v << 8 | v >> 8; } - csum = nhgets(pcsum)^0xFFFF; - csum += nhgets(p)^0xFFFF; + csum += o ^ 0xFFFF; csum += v; - hnputs(p, v); while(v = csum >> 16) csum = (csum & 0xFFFF) + v; hnputs(pcsum, csum^0xFFFF); |