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Update function-buffer-varints.md

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bmcq-0 2024-01-30 16:54:58 -05:00 • committed by GitHub
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docs/function-buffer-varints.md
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@ -21,13 +21,21 @@ The following are implementations of ULEB-128 reading/writing in Luau:
```lua
local function writeuleb128(stream, offset, value)
local start = offset
local length = buffer.len(stream)
while value >= 0x80 do
buffer.writeu8(stream, offset, bit32.bor(bit32.band(value, 0x7f), 0x80))
value = bit32.rshift(value, 7)
offset = offset + 1
while true do
if offset >= length then
error("buffer access out of bounds")
end
if value >= 0x80 then
buffer.writeu8(stream, offset, bit32.bor(bit32.band(value, 0x7f), 0x80))
value = bit32.rshift(value, 7)
offset = offset + 1
else
buffer.writeu8(stream, offset, value)
break
end
end
buffer.writeu8(stream, offset, value)
return (offset - start) + 1
end
@ -40,9 +48,9 @@ local function readuleb128(stream, offset)
local start = offset
repeat
local byte = buffer.readu8(stream, offset)
result = bit32.bor(result, bit32.lshift(bit32.band(byte, 0x7f), shift))
shift, offset = shift + 7, offset + 1
local byte = buffer.readu8(stream, offset)
result = bit32.bor(result, bit32.lshift(bit32.band(byte, 0x7f), shift))
shift, offset = shift + 7, offset + 1
until byte < 0x80 or length <= offset
return result, offset - start