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Fix binary.write_float

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This commit is contained in:
Lars Mueller 2022-06-08 10:16:47 +02:00
parent c823ca9533
commit c0b2957c67
1 changed files with 4 additions and 0 deletions
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binary.lua
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@ -104,10 +104,14 @@ function write_float(write_byte, number, on_write, double)
end end
local mantissa, exponent = math_frexp(number) local mantissa, exponent = math_frexp(number)
exponent = exponent + 127 exponent = exponent + 127
if number == 0 then exponent = 0 end -- zero must be written as a subnormal number
if exponent > 1 then if exponent > 1 then
-- TODO ensure this deals properly with subnormal numbers -- TODO ensure this deals properly with subnormal numbers
mantissa = mantissa * 2 - 1 mantissa = mantissa * 2 - 1
exponent = exponent - 1 exponent = exponent - 1
elseif exponent < 0 then -- number is currently sub-subnormal, subnormalize
mantissa = mantissa * 2^(exponent-1)
exponent = 0
end end
local sign_byte = sign + math_floor(exponent / 2) local sign_byte = sign + math_floor(exponent / 2)
if double == nil then if double == nil then