69 lines
1.6 KiB
Lua
69 lines
1.6 KiB
Lua
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function computer.getBootAddress()
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return component.invoke(component.list("eeprom")(),"getData")
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end
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function computer.setBootAddress(a)
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return component.invoke(component.list("eeprom")(),"setData",a)
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end
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return (function()
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local rv
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local function getProxy(addr)
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if type(addr) == "string" then
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return component.proxy(addr)
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end
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return addr
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end
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local eformat = "c20c4>I4>I4"
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function parsePartitions(s)
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local rt = {}
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for i = 1, s:len(), 32 do
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local n, t, start, length = string.unpack(eformat, s, i)
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n = n:gsub("\0", "")
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if n ~= "" then
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rt[#rt+1] = {n,t,start,length}
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end
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end
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return rt
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end
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function getPartitions(drive)
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return parsePartitions(drive.readSector(drive.getCapacity() / drive.getSectorSize()))
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end
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local function offsetSector(part,sector)
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if sector < 1 or sector > part[4] then error("invalid offset, not in a usable sector") end
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return (part[3] - 1) + sector
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end
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local function readSector(drive,part,sector)
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return drive.readSector(offsetSector(part,sector)):gsub("\0+$","")
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end
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local function readPart(drive,part)
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local rv = ""
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for i = 1, part[4] do
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rv=rv .. readSector(drive,part,i)
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end
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return rv
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end
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local candidates={computer.getBootAddress()}
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for a,_ in component.list("drive") do
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candidates[#candidates+1] = a
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end
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for i,a in ipairs(candidates) do
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computer.beep(("."):rep(i))
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local d = getProxy(a)
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if type(d) == "table" then
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for k,v in ipairs(getPartitions(d)) do
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if v[2] == "boot" then
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local rv = load(readPart(d,v))
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if rv then
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computer.beep("-")
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computer.setBootAddress(a)
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return rv
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end
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end
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end
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end
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end
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end)()()
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