90 lines
1.7 KiB
Lua
90 lines
1.7 KiB
Lua
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local lz = require "lzss"
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local shell = pcall(require,shell)
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local tA, tO = {}, {}
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if shell then
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tA, tO = shell.parse(...)
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else
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tA, tO = {...}, {}
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end
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tO.bsize = tO.bsize or 16384
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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 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 cfile(fn)
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local fi = io.open(fn,"rb")
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if not fi then return false end
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local fo = io.open(fn..".lss","wb")
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if not fo then fi:close() return false end
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fo:write("lz16") -- write header
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while true do
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local rblock = fi:read(tO.bsize)
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if rblock == "" or not rblock then break end
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local cblock = lz.compress(rblock)
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fo:write(cint(cblock:len(),2)..cblock)
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end
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fi:close()
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fo:close()
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return true
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end
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local function xfile(fn)
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local fi = io.open(fn,"rb")
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if not fi then return false, "unable to open input file" end
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if fi:read(4) ~= "lz16" and not tO.f then
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return false, "not an lz16 archive"
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end
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local fo = io.open(fn:sub(1,-5),"wb")
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if not fo then fi:close() return false, "unable to open output file" end
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while true do
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local len = toint(fi:read(2) or "\0\0")
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if len < 1 then
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break
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end
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fo:write(lz.decompress(fi:read(len)))
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end
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fi:close()
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fo:close()
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return true
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end
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if tO.x then -- extract
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for k,v in pairs(tA) do
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io.write(v.."...")
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local s,r = xfile(v)
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if s then
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print(" done")
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else
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print(" failed: "..r)
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end
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end
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else -- create
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for k,v in pairs(tA) do
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io.write(v.."...")
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if cfile(v) then
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print(" done.")
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else
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print(" failed.")
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end
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end
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end
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