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chore(buffer): prevent unexpected crash due precomputes

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khtsly 2026-02-16 16:56:13 +07:00
parent 492da9e607
commit 4d958a91fb
1 changed files with 10 additions and 6 deletions
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16
src/Util/Buffer/init.luau
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@ -9,6 +9,7 @@ export type Writer = {
} }
local DEFAULT_CAPACITY: number = 64 local DEFAULT_CAPACITY: number = 64
local NaN_VALUE: number = 0/0
-- 0x00-0x7F: + fixint (0-127) - single byte -- 0x00-0x7F: + fixint (0-127) - single byte
-- 0x80-0x9F: - fixint (-32 to -1) - single byte -- 0x80-0x9F: - fixint (-32 to -1) - single byte
@ -65,13 +66,13 @@ local T_COLSEQ = 0xF2 -- ColorSequence
local T_NUMSEQ = 0xF3 -- NumberSequence local T_NUMSEQ = 0xF3 -- NumberSequence
local T_BOOL_ARR = 0xDD local T_BOOL_ARR = 0xDD
local F16_LOOKUP = table.create(65536) local F16_LOOKUP: { number } = table.create(65536, 0)
do -- precomputes for readf16 do -- precomputes for readf16
for raw = 0, 65535 do for raw = 0, 65535 do
local sign = bit32.btest(raw, 0x8000) and -1 or 1 local sign: number = bit32.btest(raw, 0x8000) and -1 or 1
local exponent = bit32.extract(raw, 10, 5) local exponent: number = bit32.extract(raw, 10, 5)
local mantissa = bit32.band(raw, 0x03FF) local mantissa: number = bit32.band(raw, 0x03FF)
local value local value: number
if exponent == 0 then if exponent == 0 then
if mantissa == 0 then if mantissa == 0 then
value = 0 * sign value = 0 * sign
@ -82,12 +83,15 @@ do -- precomputes for readf16
if mantissa == 0 then if mantissa == 0 then
value = sign * math.huge value = sign * math.huge
else else
value = 0/0 -- nan value = NaN_VALUE -- nan
end end
else else
value = sign * (1 + mantissa / 1024) * math.ldexp(1, exponent - 15) value = sign * (1 + mantissa / 1024) * math.ldexp(1, exponent - 15)
end end
F16_LOOKUP[raw + 1] = value F16_LOOKUP[raw + 1] = value
if raw % 500 == 0 then
task.wait()
end
end end
end end