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OC-Copper/oc/ecomponents/relib

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-- I, 20kdc, release this into the public domain.
-- No warranty is provided, implied or otherwise.
-- 'Copper' networking implementation
-- for EEPROM usage. Filters to hostname and broadcast for ease of use.
-- Expects 'base'.
-- Variables:
-- R1 to R4: Tuning parameters in the order in the "big" version.
-- RT: timers
-- RA: weAcked
-- RN: needsAck, but no success callback, so just the timer.
-- Functions:
-- RU: Current time.
-- RP: Add timer.
-- RK: Kill timer.
-- RC: Message receive raw.
-- RF: Refresh system.
-- R: math.random
-- RS: Send message.
R1,R2,R3,R4=0x40,60,12,2.5
-- It is shorter to have this (R) than not have it or localize it. *sigh*
RT,RA,RN,RU,R,X={},{},{},computer.uptime,math.random,255
-- Add timer. Kill timer.
-- Refresh function to clean up & execute timers.
RP,RK,RF=function(f,x)
if#RT<R1 then
local t={f,RU()+x}
table.insert(RT,t)
return t
end
end,function(t)
for i=1,#RT do
if t==RT[i]then
table.remove(RT,i)
end
end
end,function()
local i,t=1,RU()
while#RT>i do
if t>RT[i][2]then
table.remove(RT,i)[1]()
else
i=i+1
end
end
end
function RC(r,f,t,d)
if d and#d>=7then
-- Keep in mind the ID used by tables is (originalPacketToName..GID)
-- ',k' unspecified value "trick"
local p,b,g,k=d:byte(2)+(d:byte(1)*X),d:byte(7),d:sub(1,5)
if b==0x01or b==0x00then
k=t..g
if not RA[k] then
r(f,t,p,d:sub(8))
else
RK(RA[k])
end
RA[k]=RP(function()RA[k]=nil end,R2)
-- Only ACK under certain conditions.
if not(b~=0x01or t~=TH)then
TS(f,d:sub(1,6).."\x02")
end
end
k=f..g
if b==0x02 and RN[k]then
RK(RN[k])
RN[k]=nil
end
end
end
function RS(t,p,d)
-- j,x unspecified. x is used in j.
local g,a,j,x=S.char(p>>8,p%X,R(X)-1,R(X)-1,R(X)-1),-1
j=function()
a=a+1
x=nil
if a~=R3 then
TS(t,g..S.char(a,1)..d)
x=RP(j,R4)
end
RN[t..g]=x
end j()
end