29 lines
652 B
Lua
29 lines
652 B
Lua
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function struct(tbl)
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local pat = tbl.endian or "="
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local args = {}
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for i=1, do
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local a, b = pairs(tbl[i])
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local k, v = a(b)
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args[i] = k
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pat = pat .. v
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end
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return setmetatable({}, {__call=function(_, arg)
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checkArg(1, arg, "string", "table")
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if (type(arg) == "string") then
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local sval = {string.unpack(pat, arg)}
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local rtn = {}
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for i=1, #args do
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rtn[args[i]] = sval[i]
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end
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return rtn, sval[#sval]
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elseif (type(arg) == "table") then
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local sval = {}
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for i=1, #args do
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sval[i] = arg[args[i]]
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end
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return string.pack(pat, unpack(sval))
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end
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end, __len=function()
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return string.packsize(pat)
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end})
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end
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