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vere: parse packet header only once

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Instead of picking out the protocol version separately from building
the u3_head struct, parse into that struct once, and then use that going
forward.
This commit is contained in:
Fang 2020-07-27 17:24:33 +02:00
parent 231ea7715d
commit 176ed23c85
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GPG Key ID: EB035760C1BBA972
1 changed files with 19 additions and 22 deletions
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41
pkg/urbit/vere/io/ames.c
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@ -679,20 +679,36 @@ _ames_recv_cb(uv_udp_t* wax_u,
unsigned flg_i)
{
u3_ames* sam_u = wax_u->data;
c3_o pas_o = c3y;
c3_o pas_o = c3y;
c3_y* byt_y = (c3_y*)buf_u->base;
c3_y* bod_y = byt_y + 4;
u3_head hed_u;
// ensure a sane message size
//
if (4 >= nrd_i) {
pas_o = c3n;
}
// unpack the packet header
//
else {
c3_w hed_w = (byt_y[0] << 0)
| (byt_y[1] << 8)
| (byt_y[2] << 16)
| (byt_y[3] << 24);
hed_u.ver_y = hed_w & 0x7;
hed_u.mug_l = (hed_w >> 3) & ((1 << 20) - 1);
hed_u.sac_y = (hed_w >> 23) & 0x3;
hed_u.rac_y = (hed_w >> 25) & 0x3;
hed_u.enc_o = (hed_w >> 27) & 0x1;
}
// ensure the protocol version matches ours
//
if ( c3y == pas_o
&& (c3y == sam_u->fit_o)
&& (sam_u->ver_y != (0x7 & *((c3_w*)buf_u->base))) )
&& (sam_u->ver_y != hed_u.ver_y) )
{
pas_o = c3n;
@ -703,25 +719,6 @@ _ames_recv_cb(uv_udp_t* wax_u,
}
if (c3y == pas_o) {
c3_y* byt_y = (c3_y*)buf_u->base;
c3_y* bod_y = byt_y + 4;
u3_head hed_u;
// unpack the packet header
//
{
c3_w hed_w = (byt_y[0] << 0)
| (byt_y[1] << 8)
| (byt_y[2] << 16)
| (byt_y[3] << 24);
hed_u.ver_y = hed_w & 0x7;
hed_u.mug_l = (hed_w >> 3) & ((1 << 20) - 1);
hed_u.sac_y = (hed_w >> 23) & 0x3;
hed_u.rac_y = (hed_w >> 25) & 0x3;
hed_u.enc_o = (hed_w >> 27) & 0x1;
}
// ensure the mug is valid
//
if ( hed_u.mug_l != _ca_mug_body(nrd_i - 4, bod_y) ) {