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local lib = require"struct"
local unpack = unpack or table.unpack  

function fromhex(str)
return (str:gsub('..', function (cc)
return string.char(tonumber(cc, 16))
end))
end

local hBinaryOutput = assert(io.open("./test.scid", "wb"))
if (hBinaryOutput) then  
    
    header = fromhex("5343494438000000280000000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000")
    hBinaryOutput:write(header)
    
    local vol  = 5
    local price  = 250
    local dt  = 41822.125
    
    record = lib.pack("dffffLLLL", dt, price, price, price, price, vol, vol, vol, vol)
    
    hBinaryOutput:write(record)        
    hBinaryOutput:close()    
end