mirror of
https://github.com/luau-lang/luau.git
synced 2024-11-16 06:45:44 +08:00
81 lines
2.6 KiB
Lua
81 lines
2.6 KiB
Lua
local bench = script and require(script.Parent.bench_support) or require("bench_support")
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function test()
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local base64 = {}
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local extract = bit32.extract
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function base64.makeencoder( s62, s63, spad )
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local encoder = {}
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for b64code, char in pairs{[0]='A','B','C','D','E','F','G','H','I','J',
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'K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y',
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'Z','a','b','c','d','e','f','g','h','i','j','k','l','m','n',
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'o','p','q','r','s','t','u','v','w','x','y','z','0','1','2',
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'3','4','5','6','7','8','9',s62 or '+',s63 or'/',spad or'='} do
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encoder[b64code] = char:byte()
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end
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return encoder
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end
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function base64.makedecoder( s62, s63, spad )
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local decoder = {}
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for b64code, charcode in pairs( base64.makeencoder( s62, s63, spad )) do
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decoder[charcode] = b64code
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end
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return decoder
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end
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local DEFAULT_ENCODER = base64.makeencoder()
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local DEFAULT_DECODER = base64.makedecoder()
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local char, concat, byte = string.char, table.concat, string.byte
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function base64.decode( b64, decoder, usecaching )
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decoder = decoder or DEFAULT_DECODER
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local cache = usecaching and {}
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local t, k = {}, 1
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local n = #b64
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local padding = b64:sub(-2) == '==' and 2 or b64:sub(-1) == '=' and 1 or 0
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for i = 1, padding > 0 and n-4 or n, 4 do
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local a, b, c, d = byte( b64, i, i+3 )
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local s
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if usecaching then
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local v0 = a*0x1000000 + b*0x10000 + c*0x100 + d
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s = cache[v0]
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if not s then
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local v = decoder[a]*0x40000 + decoder[b]*0x1000 + decoder[c]*0x40 + decoder[d]
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s = char( extract(v,16,8), extract(v,8,8), extract(v,0,8))
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cache[v0] = s
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end
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else
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local v = decoder[a]*0x40000 + decoder[b]*0x1000 + decoder[c]*0x40 + decoder[d]
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s = char( extract(v,16,8), extract(v,8,8), extract(v,0,8))
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end
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t[k] = s
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k = k + 1
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end
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if padding == 1 then
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local a, b, c = byte( b64, n-3, n-1 )
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local v = decoder[a]*0x40000 + decoder[b]*0x1000 + decoder[c]*0x40
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t[k] = char( extract(v,16,8), extract(v,8,8))
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elseif padding == 2 then
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local a, b = byte( b64, n-3, n-2 )
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local v = decoder[a]*0x40000 + decoder[b]*0x1000
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t[k] = char( extract(v,16,8))
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end
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return concat( t )
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end
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local ts0 = os.clock()
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for i = 1, 2000 do
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base64.decode("TWFuIGlzIGRpc3Rpbmd1aXNoZWQsIG5vdCBvbmx5IGJ5IGhpcyByZWFzb24sIGJ1dCBieSB0aGlzIHNpbmd1bGFyIHBhc3Npb24gZnJvbSBvdGhlciBhbmltYWxzLCB3aGljaCBpcyBhIGx1c3Qgb2YgdGhlIG1pbmQsIHRoYXQgYnkgYSBwZXJzZXZlcmFuY2Ugb2YgZGVsaWdodCBpbiB0aGUgY29udGludWVkIGFuZCBpbmRlZmF0aWdhYmxlIGdlbmVyYXRpb24gb2Yga25vd2xlZGdlLCBleGNlZWRzIHRoZSBzaG9ydCB2ZWhlbWVuY2Ugb2YgYW55IGNhcm5hbCBwbGVhc3VyZS4=")
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end
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local ts1 = os.clock()
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return ts1 - ts0
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end
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bench.runCode(test, "base64") |