60 lines
1.2 KiB
Lua
60 lines
1.2 KiB
Lua
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function pack_u64_dyn(v)
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local out = {}
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for i = 1, 8 do
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local cur = v & 0x7f
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v = v >> 7
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if v ~= 0 then
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out[#out + 1] = string.char(cur | 0x80)
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else
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out[#out + 1] = string.char(cur)
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return table.concat(out)
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end
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end
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if v ~= 0 then
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out[#out + 1] = string.char(v)
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end
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return table.concat(out)
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end
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function unpack_u64_dyn(str)
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local v = 0
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local i = 1
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local bits = 0
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while true do
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local b = str:byte(i)
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i = i + 1
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local has_next = (bits < 56) and (b >> 7) ~= 0
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if has_next then
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b = b & 0x7f
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end
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v = v | (b << bits)
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if not has_next then
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break
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end
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bits = bits + 7
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end
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return v
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end
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function pack_i64_dyn(v)
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local neg = (v >> 63)
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if v < 0 then
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v = (v * -1) & ~(1 << 63)
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end
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return pack_u64_dyn((neg << 6) | ((v & ~0x3f) << 1) | (v & 0x3f))
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end
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function unpack_i64_dyn(str)
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local v = unpack_u64_dyn(str)
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local neg = ((v >> 6) & 1) ~= 0
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v = ((v >> 1) & ~0x3f) | (v & 0x3f)
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if neg then
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if v == 0 then
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v = 1 << 63
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else
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v = v * -1
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end
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end
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return v
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end
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