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implement proper tape support, also speed up loading from tapes.

This commit is contained in:
Izaya 2023-08-05 10:19:07 +10:00
parent 2e959ebbbf
commit a144937e24
1 changed files with 22 additions and 17 deletions
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39
partition/driveboot.lua
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@ -1,10 +1,11 @@
return (function()
local component = component
function computer.getBootAddress()
return component.invoke(component.list("eeprom")(),"getData")
end
function computer.setBootAddress(a)
return component.invoke(component.list("eeprom")(),"setData",a)
end
return (function()
local rv
local function getProxy(addr)
if type(addr) == "string" then
@ -13,14 +14,22 @@ local function getProxy(addr)
return addr
end
local function aop(td,n,mn,...)
local rts = td.seek(-math.huge)
td.seek(n)
local rv = {td[mn](...)}
td.seek(-math.huge)
td.seek(rts)
local rv
if td.getPosition then
local rts = td.getPosition()
if rts ~= n then
td.seek(n - rts)
end
rv = {td[mn](...)}
else
local rts = td.seek(-math.huge)
td.seek(n)
rv = {td[mn](...)}
td.seek(-math.huge)
td.seek(rts)
end
return table.unpack(rv)
end
local eformat = "c20c4>I4>I4"
function parsePartitions(s)
local rt = {}
@ -33,7 +42,6 @@ function parsePartitions(s)
end
return rt
end
function getPartitions(drive)
local rv
if drive.type == "tape_drive" then
@ -45,7 +53,6 @@ function getPartitions(drive)
end
return rv[1][2] == "mtpt" and rv
end
local function offsetSector(part,sector)
if sector < 1 or sector > part[4] then error("invalid offset, not in a usable sector") end
return (part[3] - 1) + sector
@ -54,16 +61,16 @@ local function readSector(drive,part,sector)
return drive.readSector(offsetSector(part,sector)):gsub("\0+$","")
end
local function readPart(drive,part)
if drive.type == "tape_drive" then
return aop(drive, (part[3]-1)*512, "read", part[4] * 512)
end
local rv = ""
for i = 1, part[4] do
rv=rv .. readSector(drive,part,i)
if drive.type == "tape_drive" then
rv=rv .. aop(drive, ((part[3]-2) + i)*512, "read", 512):gsub("\0+$","")
else
rv=rv .. readSector(drive,part,i)
end
end
return rv
end
local pB = computer.getBootAddress()
local candidates={pB,[pB] = true}
if not component.type(pB) then candidates[1] = nil end
@ -71,11 +78,10 @@ for a,t in component.list() do
candidates[#candidates+1] = not candidates[a] and (t == "drive" or t == "filesystem" or t == "tape_drive") and a or nil
candidates[a] = true
end
local function wL()
return false
end
local cL = wL
local cL=wL
local ga, sa = component.list("gpu")(), component.list("screen")()
if ga and sa then
local g, cl = component.proxy(ga), 1
@ -110,7 +116,6 @@ if ga and sa then
end
until computer.uptime() >= to
end
for i,a in ipairs(candidates) do
computer.beep(("."):rep(i))
wL("Attempting to load from "..a)