--[[

Copyright 2017 YANG Huan (sy.yanghuan@gmail.com).

Licensed under the Apache License, Version 2.0 (the "License");

you may not use this file except in compliance with the License.

You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software

distributed under the License is distributed on an "AS IS" BASIS,

WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

See the License for the specific language governing permissions and

limitations under the License.

--]]

local System = System

local throw = System.throw

local cast = System.cast

local as = System.as

local trunc = System.trunc

local define = System.define

local band = System.band

local bor = System.bor

local sl = System.sl

local sr = System.sr

local div = System.div

local identityFn = System.identityFn

local IConvertible = System.IConvertible

local systemToString = System.toString

local checkIndex = System.checkIndexAndCount

local OverflowException = System.OverflowException

local FormatException = System.FormatException

local ArgumentException = System.ArgumentException

local ArgumentNullException = System.ArgumentNullException

local InvalidCastException = System.InvalidCastException

local SByte = System.SByte

local Byte = System.Byte

local Int16 = System.Int16

local UInt16 = System.UInt16

local Int32 = System.Int32

local UInt32 = System.UInt32

local Int64 = System.Int64

local UInt64 = System.UInt64

local Single = System.Single

local Double = System.Double

local Boolean = System.Boolean

local Char = System.Char

local DateTime = System.DateTime

local String = System.String

local Object = System.Object

local ParseSByte = SByte.Parse

local ParseByte = Byte.Parse

local ParseInt16 = Int16.Parse

local ParseUInt16 = UInt16.Parse

local ParseInt32 = Int32.Parse

local ParseUInt32 = UInt32.Parse

local ParseInt64 = Int64.Parse

local ParseUInt64 = UInt64.Parse

local ParseSingle = Single.Parse

local ParseDouble = Double.Parse

local ParseBoolean = Boolean.Parse

local type = type

local string = string

local sbyte = string.byte

local math = math

local floor = math.floor

local tconcat = table.concat

local getmetatable = getmetatable

local tonumber = tonumber

local select = select

local function toBoolean(value)

if value == nil then return false end

local typename = type(value)

if typename == "number" then

return value ~= 0

elseif typename == "string" then

return ParseBoolean(value)

elseif typename == "boolean" then

return value

else

return cast(IConvertible, value):ToBoolean()

end

end

local function toChar(value)

if value == nil then return 0 end

local typename = type(value)

if typename == "number" then

if value ~= floor(value) or value > 9223372036854775807 or value < (-9223372036854775807 - 1) then

throw(InvalidCastException("InvalidCast_FromTo_Char"))

end

if value < 0 or value > 65535 then

throw(OverflowException("Overflow_Char"))

end

return value

elseif typename == "string" then

if #value ~= 1 then

throw(FormatException("Format_NeedSingleChar"))

end

return sbyte(value)

else

return cast(IConvertible, value):ToChar()

end

end

local function parseBits(s, p, n)

local i, j, v = s:find(p)

if not i then

throw(FormatException())

end

v = tonumber(v)

for i = j + 1, #s do

local ch = sbyte(s, i)

local b = ch - 48

if b < 0 or b >= n then

if not s:find("^%s*$", i) then

throw(FormatException())

end

break

end

v = v * n + b

end

return v

end

local function parseNumberFromBase(value, fromBase, min, max)

if fromBase == 2 then

value = parseBits(value, "^%s*([01])", fromBase)

elseif fromBase == 8 then

value = parseBits(value, "^%s*([0-7])", fromBase)

elseif fromBase == 16 then

local _, _, v = value:find("^%s*(%w+)%s*$")

if not v then

throw(ArgumentException("String cannot contain a minus sign if the base is not 10."))

end

local ch = sbyte(v, 2)

if ch == 120 or ch == 88 then

else

v = "0x" .. v

end

value = tonumber(v)

if value == nil then

throw(FormatException())

end

else

throw(ArgumentException("fromBase"))

end

if max == 127 and value <= 255 then

return System.toSByte(value)

end

if max == 32767 and value <= 65535 then

return System.toInt16(value)

end

if max == 2147483647 and value <= 4294967295 then

return System.toInt32(value)

end

if value < min or value > max then

throw(OverflowException())

end

return value

end

local function toNumber(value, min, max, parse, objectTo, sign)

if value == nil then return 0 end

local typename = type(value)

if typename == "number" then

if sign == false then

value = System.ToSingle(value * 1.0)

elseif sign == true then

value = value * 1.0

else

local i = value

value = trunc(value)

if value ~= i then

local dif = i - value

if value >= 0 then

if dif > 0.5 or (dif == 0.5 and value % 2 ~= 0) then

value = value + 1

end

else

if dif < -0.5 or (dif == -0.5 and value % 2 ~= 0) then

value = value - 1

end

end

end

if value < min or value > max then

throw(OverflowException())

end

end

return value

elseif typename == "string" then

if sign and sign ~= 10 and type(sign) == "number" then

return parseNumberFromBase(value, sign, min, max)

end

return parse(value)

elseif typename == "boolean" then

return value and 1 or 0

else

return objectTo(value)

end

end

local function objectToSByte(value)

return cast(IConvertible, value):ToSByte()

end

local function toSByte(value, fromBase)

return toNumber(value, -128, 127, ParseSByte, objectToSByte, fromBase)

end

local function objectToByte(value)

return cast(IConvertible, value):ToByte()

end

local function toByte(value, fromBase)

return toNumber(value, 0, 255, ParseByte, objectToByte, fromBase)

end

local function objectToInt16(value)

return cast(IConvertible, value):ToInt16()

end

local function toInt16(value, fromBase)

return toNumber(value, -32768, 32767, ParseInt16, objectToInt16, fromBase)

end

local function objectToUInt16(value)

return cast(IConvertible, value):ToUInt16()

end

local function toUInt16(value, fromBase)

return toNumber(value, 0, 65535, ParseUInt16, objectToUInt16, fromBase)

end

local function objectToInt32(value)

return cast(IConvertible, value):ToInt32()

end

local function toInt32(value, fromBase)

return toNumber(value, -2147483648, 2147483647, ParseInt32, objectToInt32, fromBase)

end

local function objectToUInt32(value)

return cast(IConvertible, value):ToUInt32()

end

local function toUInt32(value, fromBase)

return toNumber(value, 0, 4294967295, ParseUInt32, objectToUInt32, fromBase)

end

local function objectToInt64(value)

return cast(IConvertible, value):ToInt64()

end

local function toInt64(value, fromBase)

return toNumber(value, (-9223372036854775807 - 1), 9223372036854775807, ParseInt64, objectToInt64, fromBase)

end

local function objectToUInt64(value)

return cast(IConvertible, value):ToUInt64()

end

local function toUInt64(value, fromBase)

return toNumber(value, 0, 18446744073709551615.0, ParseUInt64, objectToUInt64, fromBase)

end

local function objectToSingle(value)

return cast(IConvertible, value):ToSingle()

end

local function toSingle(value)

return toNumber(value, nil, nil, ParseSingle, objectToSingle, false)

end

local function objectToDouble(value)

return cast(IConvertible, value):ToDouble()

end

local function toDouble(value)

return toNumber(value, nil, nil, ParseDouble, objectToDouble, true)

end

local function toDateTime(value)

if value == nil then return DateTime.MinValue end

if getmetatable(value) == DateTime then return value end

if type(value) == "string" then return DateTime.Parse(value) end

return cast(IConvertible, value):ToDateTime()

end

local function toBaseType(ic, targetType)

local cls = targetType[1]

if cls == Boolean then return ic:ToBoolean() end

if cls == Char then return ic:ToChar() end

if cls == SByte then return ic:ToSByte() end

if cls == Byte then return ic:ToByte() end

if cls == Int16 then return ic:ToInt16() end

if cls == UInt16 then return ic:ToUInt16() end

if cls == Int32 then return ic:ToInt32() end

if cls == UInt32 then return ic:ToUInt32() end

if cls == Int64 then return ic:ToInt64() end

if cls == UInt64 then return ic:ToUInt64() end

if cls == Single then return ic:ToSingle() end

if cls == Double then return ic:ToDouble() end

if cls == DateTime then return ic:ToDateTime() end

if cls == String then return ic:ToString() end

if cls == Object then return ic end

end

local function defaultToType(value, targetType)

if targetType == nil then throw(ArgumentNullException("targetType")) end

if value:GetType() == targetType then return value end

local v = toBaseType(value, targetType)

if v ~= nil then

return v

end

throw(InvalidCastException())

end

local function changeType(value, conversionType)

if conversionType == nil then

throw(ArgumentNullException("conversionType"))

end

if value == nil then

if conversionType:getIsValueType() then

throw(InvalidCastException("InvalidCast_CannotCastNullToValueType"))

end

return nil

end

local ic = as(value, IConvertible)

if ic == nil then

if value:GetType() == conversionType then

return value

end

throw(InvalidCastException("InvalidCast_IConvertible"))

end

local v = toBaseType(ic, conversionType)

if v ~= nil then

return v

end

return ic.ToType(conversionType)

end

local rexp

if math.frexp then

rexp = function (x)

local _, v = math.frexp(x)

return v

end

else

local abs, log = math.abs, math.log

local log2 = log(2)

rexp = function (x)

return floor(log(abs(x)) / log2) + 1

end

end

local function toBits(num, bits)

-- returns a table of bits, most significant first.

bits = bits or math.max(1, rexp(num))

local t = {} -- will contain the bits

for b = bits, 1, -1 do

local i = num % 2

t[b] = i

num = div(num - i, 2)

end

if bits == 64 and t[1] == 0 then

return tconcat(t, nil, 2, bits)

end

return tconcat(t)

end

local function toString(value, toBaseOrProvider, cast)

if value == nil then

return ""

end

if toBaseOrProvider then

if type(toBaseOrProvider) == "number" then

if toBaseOrProvider ~= 10 then

if cast and value < 0 then

value = cast(value)

end

end

if toBaseOrProvider == 2 then

return toBits(value)

elseif toBaseOrProvider == 8 then

return ("%o"):format(value)

elseif toBaseOrProvider == 10 then

return value .. ""

elseif toBaseOrProvider == 16 then

return ("%x"):format(value)

else

throw(ArgumentException())

end

end

end

return systemToString(value)

end

local base64Table = {'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O',

'P','Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d',

'e','f','g','h','i','j','k','l','m','n','o','p','q','r','s',

't','u','v','w','x','y','z','0','1','2','3','4','5','6','7',

'8','9','+','/','=' };

local function toBase64String(t, ...)

if t == nil then throw(ArgumentNullException("inArray")) end

local n = select("#", ...)

local offset, length, options

if n == 0 then

offset, length, options = 0, #t, 0

elseif n == 1 then

offset, length, options = 0, #t, ...

elseif n == 2 then

options, offset, length = 0, ...

checkIndex(t, offset, length)

else

offset, length, options = ...

checkIndex(t, offset, length)

end

local insertLineBreaks, lengthmod3, outChars = options == 1, length % 3, {}

local calcLength, j, charcount = offset + (length - lengthmod3), 1, 0

local i = offset

while i < calcLength do

if insertLineBreaks then

if charcount == 76 then

outChars[j] = "\r\n"

j = j + 1

charcount = 0

end

charcount = charcount + 4

end

local a, b, c = t:get(i), t:get(i + 1), t:get(i + 2)

outChars[j] = base64Table[sr(band(a, 0xfc), 2) + 1]

outChars[j + 1] = base64Table[bor(sl(band(a, 0x03), 4), sr(band(b, 0xf0), 4)) + 1]

outChars[j + 2] = base64Table[bor(sl(band(b, 0x0f), 2), sr(band(c, 0xc0), 6)) + 1]

outChars[j + 3] = base64Table[band(c, 0x3f) + 1]

j = j + 4

i = i + 3

end

i = calcLength

if insertLineBreaks and lengthmod3 ~= 0 and charcount == 76 then

outChars[j] = "\r\n"

j = j + 1

end

if lengthmod3 == 2 then

local a, b = t:get(i), t:get(i + 1)

outChars[j] = base64Table[sr(band(a, 0xfc), 2) + 1]

outChars[j + 1] = base64Table[bor(sl(band(a, 0x03), 4), sr(band(b, 0xf0), 4)) + 1]

outChars[j + 2] = base64Table[sl(band(b, 0x0f), 2) + 1]

outChars[j + 3] = '='

elseif lengthmod3 == 1 then

local a = t:get(i)

outChars[j] = base64Table[sr(band(a, 0xfc), 2) + 1]

outChars[j + 1] = base64Table[sl(band(a, 0x03), 4) + 1]

outChars[j + 2] = '='

outChars[j + 3] = '='

end

return tconcat(outChars)

end

local function fromBase64ComputeResultLength(s, i, n)

local usefulInputLength, padding = n, 0

n = i + n

while i < n do

local c = s:get(i)

i = i + 1

if c <= 32 then

usefulInputLength = usefulInputLength - 1

elseif c == 61 then

usefulInputLength = usefulInputLength - 1

padding = padding + 1

end

end

if padding ~= 0 then

if padding == 1 then

padding = 2

elseif padding == 2 then

padding = 1

else

throw(FormatException("Format_BadBase64Char"))

end

end

return div(usefulInputLength, 4) * 3 + padding

end

local function fromBase64Decode(s, offset, len, t, resultLength)

local i, j, codes, gotoEqualityCharEncountered = 0, 0, 0x000000ff, false

while true do

if i >= len then

break

end

local coroutine

local c = s:get(i + offset)

i = i + 1

if c >= 65 and c <= 90 then

c = c - 65

elseif c >= 97 and c <= 122 then

c = c - 71

elseif c >= 48 and c <= 57 then

c = c + 4

else

if c == 43 then

c = 62

elseif c == 47 then

c = 63

elseif c == 13 or c == 10 or c == 32 or c == 9 then

coroutine = true

elseif c == 61 then

gotoEqualityCharEncountered = true

break

else

throw(FormatException("Format_BadBase64Char"))

end

end

if not coroutine then

codes = bor(sl(codes, 6), c)

if (band(codes, 0x80000000)) ~= 0 then

if resultLength - j < 3 then

return - 1

end

t[j + 1] = band(sr(codes, 16), 0xff)

t[j + 2] = band(sr(codes, 8), 0xff)

t[j + 3] = band(codes, 0xff)

j = j + 3

codes = 0x000000ff

end

end

end

if gotoEqualityCharEncountered then

if i == len then

codes = sl(codes, 6)

if (band(codes, 0x80000000)) == 0 then

throw(FormatException("Format_BadBase64CharArrayLength"))

end

if resultLength - j < 2 then

return - 1

end

t[j + 1] = band(sr(codes, 16), 0xff)

t[j + 2] = band(sr(codes, 8), 0xff)

j = j + 2

codes = 0x000000ff

else

while i < len - 1 do

local c = s:get(i + offset)

if c ~= 32 and c ~= 10 and c ~= 13 and c ~= 9 then

break

end

i = i + 1

end

if i == len - 1 and s:get(i + offset) == 61 then

codes = sl(codes, 12)

if (band(codes, 0x80000000)) == 0 then

throw(FormatException(("Format_BadBase64CharArrayLength")))

end

if resultLength - j < 1 then

return - 1

end

t[j + 1] = band(sr(codes, 16), 0xff)

j = j + 1

codes = 0x000000ff

else

System.throw(System.FormatException(("Format_BadBase64Char")))

end

end

end

if codes ~= 0x000000ff then

throw(FormatException(("Format_BadBase64CharArrayLength")))

end

return j

end

local function fromBase64CharPtr(s, i, n)

while n > 0 do

local c = s:get(i + n - 1)

if c ~= 32 and c ~= 10 and c ~= 13 and c ~= 9 then

break

end

n = n - 1

end

local resultLength = fromBase64ComputeResultLength(s, i, n)

local t = {}

fromBase64Decode(s, i, n, t, resultLength)

return System.arrayFromTable(t, Byte)

end

local function fromBase64String(s)

if s == nil then throw(ArgumentNullException("s")) end

return fromBase64CharPtr(s, 0, #s)

end

local function fromBase64CharArray(inArray, offset, length)

checkIndex(inArray, offset, length)

if #inArray == 0 then

return System.Array.Empty(Byte)

end

return fromBase64CharPtr(inArray, offset, length)

end

define("System.Convert", {

ToBoolean = toBoolean,

ToChar = toChar,

ToSByte = toSByte,

ToByte = toByte,

ToInt16 = toInt16,

ToUInt16 = toUInt16,

ToInt32 = toInt32,

ToUInt32 = toUInt32,

ToInt64 = toInt64,

ToUInt64 = toUInt64,

ToSingle = toSingle,

ToDouble = toDouble,

ToDateTime = toDateTime,

ToBase64String = toBase64String,

FromBase64String = fromBase64String,

FromBase64CharArray = fromBase64CharArray,

ChangeType = changeType,

ToString = toString,

ToStringFromChar = string.char

})

String.ToBoolean = toBoolean

String.ToChar = toChar

String.ToSByte = toSByte

String.ToByte = toByte

String.ToInt16 = toInt16

String.ToUInt16 = toUInt16

String.ToInt32 = toInt32

String.ToUInt32 = toUInt32

String.ToInt64 = toInt64

String.ToUInt64 = toUInt64

String.ToSingle = identityFn

String.ToDouble = toDouble

String.ToDateTime = toDateTime

String.ToType = defaultToType

local function throwInvalidCastException()

throw(InvalidCastException())

end

local Number = System.Number

Number.ToBoolean = toBoolean

Number.ToChar = toChar

Number.ToSByte = toSByte

Number.ToByte = toByte

Number.ToInt16 = toInt16

Number.ToUInt16 = toUInt16

Number.ToInt32 = toInt32

Number.ToUInt32 = toUInt32

Number.ToInt64 = toInt64

Number.ToUInt64 = toUInt64

Number.ToSingle = toSingle

Number.ToDouble = toDouble

Number.ToDateTime = throwInvalidCastException

Number.ToType = defaultToType

Boolean.ToBoolean = identityFn

Boolean.ToChar = throwInvalidCastException

Boolean.ToSByte = toSByte

Boolean.ToByte = toByte

Boolean.ToInt16 = toInt16

Boolean.ToUInt16 = toUInt16

Boolean.ToInt32 = toInt32

Boolean.ToUInt32 = toUInt32

Boolean.ToInt64 = toInt64

Boolean.ToUInt64 = toUInt64

Boolean.ToSingle = toSingle

Boolean.ToDouble = toDouble

Boolean.ToDateTime = throwInvalidCastException

Boolean.ToType = defaultToType

DateTime.ToBoolean = throwInvalidCastException

DateTime.ToChar = throwInvalidCastException

DateTime.ToSByte = throwInvalidCastException

DateTime.ToByte = throwInvalidCastException

DateTime.ToInt16 = throwInvalidCastException

DateTime.ToUInt16 = throwInvalidCastException

DateTime.ToInt32 = throwInvalidCastException

DateTime.ToUInt32 = throwInvalidCastException

DateTime.ToInt64 = throwInvalidCastException

DateTime.ToUInt64 = throwInvalidCastException

DateTime.ToSingle = throwInvalidCastException

DateTime.ToDouble = throwInvalidCastException

DateTime.ToDateTime = identityFn

DateTime.ToType = defaultToType

-- BitConverter

local global = System.global

local systemToInt16 = System.toInt16

local systemToInt32 = System.toInt32

local systemToUInt64 = System.toUInt64

local arrayFromTable = System.arrayFromTable

local NotSupportedException = System.NotSupportedException

local assert = assert

local rawget = rawget

local unpack = table.unpack

local schar = string.char

-- https://github.com/ToxicFrog/vstruct/blob/master/io/endianness.lua#L30

local isLittleEndian = true

if rawget(global, "jit") then

if require("ffi").abi("be") then

isLittleEndian = false

end

else

local dump = string.dump

if dump and sbyte(dump(System.emptyFn), 7) == 0x00 then

isLittleEndian = false

end

end

local function bytes(t)

return arrayFromTable(t, Byte)

end

local spack, sunpack, getBytesFromInt64, toInt64

if System.luaVersion < 5.3 then

local struct = rawget(global, "struct")

if struct then

spack, sunpack = struct.pack, struct.unpack

end

if not spack then

spack = function ()

throw(NotSupportedException("not found struct"), 1)

end

sunpack = spack

end

getBytesFromInt64 = function (value)

if value <= -2147483647 or value >= 2147483647 then

local s = spack("i8", value)

return bytes({

sbyte(s, 1),

sbyte(s, 2),

sbyte(s, 3),

sbyte(s, 4),

sbyte(s, 5),

sbyte(s, 6),

sbyte(s, 7),

sbyte(s, 8)

})

end

return bytes({

band(value, 0xff),

band(sr(value, 8), 0xff),

band(sr(value, 16), 0xff),

band(sr(value, 24), 0xff),

0,

0,

0,

0

})

end

toInt64 = function (value, startIndex)

checkIndex(value, startIndex, 8)

if value <= -2147483647 or value >= 2147483647 then

throw(System.NotSupportedException())

end

if isLittleEndian then

local i = value[startIndex + 1]

i = bor(i, sl(value[startIndex + 2], 8))

i = bor(i, sl(value[startIndex + 3], 16))

i = bor(i, sl(value[startIndex + 4], 24))

return i

else

local i = value[startIndex + 8]

i = bor(i, sl(value[startIndex + 7], 8))

i = bor(i, sl(value[startIndex + 6], 16))

i = bor(i, sl(value[startIndex + 5], 24))

return i

end

end

else

spack, sunpack = string.pack, string.unpack

getBytesFromInt64 = function (value)

return bytes({

band(value, 0xff),

band(sr(value, 8), 0xff),

band(sr(value, 16), 0xff),

band(sr(value, 24), 0xff),

band(sr(value, 32), 0xff),

band(sr(value, 40), 0xff),

band(sr(value, 48), 0xff),

band(sr(value, 56), 0xff)

})

end

toInt64 = function (value, startIndex)

checkIndex(value, startIndex, 8)

if isLittleEndian then

local i = value[startIndex + 1]

i = bor(i, sl(value[startIndex + 2], 8))

i = bor(i, sl(value[startIndex + 3], 16))

i = bor(i, sl(value[startIndex + 4], 24))

i = bor(i, sl(value[startIndex + 5], 32))

i = bor(i, sl(value[startIndex + 6], 40))

i = bor(i, sl(value[startIndex + 7], 48))

i = bor(i, sl(value[startIndex + 8], 56))

return i

else

local i = value[startIndex + 8]

i = bor(i, sl(value[startIndex + 7], 8))

i = bor(i, sl(value[startIndex + 6], 16))

i = bor(i, sl(value[startIndex + 5], 24))

i = bor(i, sl(value[startIndex + 4], 32))

i = bor(i, sl(value[startIndex + 3], 40))

i = bor(i, sl(value[startIndex + 2], 48))

i = bor(i, sl(value[startIndex + 1], 56))

return i

end

end

end

local function getBytesFromBoolean(value)

return bytes({ value and 1 or 0 })

end

local function getBytesFromInt16(value)

return bytes({

band(value, 0xff),

band(sr(value, 8), 0xff),

})

end

local function getBytesFromInt32(value)

return bytes({

band(value, 0xff),

band(sr(value, 8), 0xff),

band(sr(value, 16), 0xff),

band(sr(value, 24), 0xff)

})

end

local function getBytesFromFloat(value)

local s = spack("f", value)

return bytes({

sbyte(s, 1),

sbyte(s, 2),

sbyte(s, 3),

sbyte(s, 4)

})

end

local function getBytesFromDouble(value)

local s = spack("d", value)

return bytes({

sbyte(s, 1),

sbyte(s, 2),

sbyte(s, 3),

sbyte(s, 4),

sbyte(s, 5),

sbyte(s, 6),

sbyte(s, 7),

sbyte(s, 8)

})

end

local function toBoolean(value, startIndex)

checkIndex(value, startIndex, 1)

return value[startIndex + 1] ~= 0 and true or false

end

local function toUInt16(value, startIndex)

checkIndex(value, startIndex, 2)

if isLittleEndian then

value = bor(value[startIndex + 1], sl(value[startIndex + 2], 8))

else

value = bor(sl(value[startIndex + 1], 8), value[startIndex + 2])

end

return value

end

local function toInt16(value, startIndex)

value = toUInt16(value, startIndex)

return systemToInt16(value)

end

local function toUInt32(value, startIndex)

checkIndex(value, startIndex, 4)

local i

if isLittleEndian then

i = value[startIndex + 1]

i = bor(i, sl(value[startIndex + 2], 8))

i = bor(i, sl(value[startIndex + 3], 16))

i = bor(i, sl(value[startIndex + 4], 24))

else

i = value[startIndex + 4]

i = bor(i, sl(value[startIndex + 3], 8))

i = bor(i, sl(value[startIndex + 2], 16))

i = bor(i, sl(value[startIndex + 1], 24))

end

return i

end

local function toInt32(value, startIndex)

value = toUInt32(value, startIndex)

return systemToInt32(value)

end

local function toUInt64(value, startIndex)

value = toInt64(value, startIndex)

return systemToUInt64(value)

end

local function toSingle(value, startIndex)

checkIndex(value, startIndex, 4)

return sunpack("f", schar(unpack(value, startIndex + 1)))

end

local function toDouble(value, startIndex)

checkIndex(value, startIndex, 8)

return sunpack("d", schar(unpack(value, startIndex + 1)))

end

local function getHexValue(i)

assert(i >= 0 and i < 16, "i is out of range.")

if i < 10 then

return i + 48

end

return i - 10 + 65

end

local function toString(value, startIndex, length)

if value == nil then throw(ArgumentNullException("value")) end

local len = #value

if not startIndex then

startIndex, length = 0, #value

elseif not length then

length = len - startIndex

end

checkIndex(value, startIndex, length)

if length == 0 then

return ""

end

local t = {}

len = 1

for i = startIndex + 1, startIndex + length do

local b = value[i]

t[len] = getHexValue(div(b, 16))

t[len + 1] = getHexValue(b % 16)

t[len + 2] = 45

len = len + 3

end

return schar(unpack(t, 1, len - 2))

end

local function doubleToInt64Bits(value)

local s = spack("d", value)

return (sunpack("i8", s))

end

local function int64BitsToDouble(value)

local s = spack("i8", value)

return (sunpack("d", s))

end

define("System.BitConverter", {

IsLittleEndian = isLittleEndian,

GetBytesFromBoolean = getBytesFromBoolean,

GetBytesFromInt16 = getBytesFromInt16,

GetBytesFromInt32 = getBytesFromInt32,

GetBytesFromInt64 = getBytesFromInt64,

GetBytesFromFloat = getBytesFromFloat,

GetBytesFromDouble = getBytesFromDouble,

ToBoolean = toBoolean,

ToChar = toUInt16,

ToInt16 = toInt16,

ToUInt16 = toUInt16,

ToInt32 = toInt32,

ToUInt32 = toUInt32,

ToInt64 = toInt64,

ToUInt64 = toUInt64,

ToSingle = toSingle,

ToDouble = toDouble,

ToString = toString,

DoubleToInt64Bits = doubleToInt64Bits,

Int64BitsToDouble = int64BitsToDouble

})