90 lines
1.7 KiB
Lua
90 lines
1.7 KiB
Lua
local mtar = {}
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-- detect OS hopefully
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if _OSVERSION then
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if _OSVERSION:sub(1,8) == "OpenOS" then
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OPENOS = true
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elseif _OSVERSION:sub(1,9) == "PsychOS" then
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PSYCHOS = true
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end
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else
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LINUX = true
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end
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local function mkdir(dir)
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if OPENOS or LINUX then
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os.execute("mkdir "..dest.."/"..dir.." &> /dev/null")
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elseif PSYCHOS then
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-- todo: write PsychOS support
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end
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end
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local function toint(s)
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s=s or ""
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local n = 0
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local i = 1
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while true do
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local p = s:sub(i,i)
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if p == "" then break end
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local b = string.byte(p)
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n = n << 8
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n = n | b
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i=i+1
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end
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return n
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end
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local function cint(n,l)
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local t={}
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for i = 0, 7 do
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t[i+1] = (n >> (i * 8)) & 0xFF
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end
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return string.reverse(string.char(table.unpack(t)):sub(1,l))
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end
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local function cleanPath(path)
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local pt = {}
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for segment in path:gmatch("[^/]+") do
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if segment == ".." then
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pt[#pt] = nil
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elseif segment ~= "." then
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pt[#pt+1] = segment
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end
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end
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return table.concat(pt,"/")
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end
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function mtar.genHeader(fname,len) -- generate a header for file *fname* when provided with file length *len*
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return string.format("%s%s%s",cint(fname:len(),2),fname,cint(len,2))
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end
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function mtar.unarchive(stream,dest)
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dest = dest or "."
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mkdir(dest)
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while true do
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local nlen = toint(stream:read(2))
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if nlen == 0 then
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break
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end
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local name = cleanPath(stream:read(nlen))
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local fsize = toint(stream:read(2))
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print(name,fsize)
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local dir = name:match("(.+)/.*%.?.+")
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if (dir) then
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mkdir(dir)
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end
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local f = io.open(dest.."/"..name,"wb")
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local rsize,buf = fsize, ""
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if f then
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repeat
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buf = stream:read(math.min(rsize,1024))
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f:write(buf)
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rsize = rsize - buf:len()
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until rsize <= 1
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f:close()
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end
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end
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end
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return mtar
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