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997 lines (909 loc) · 26.2 KB
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Copy pathConvert.lua
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997 lines (909 loc) · 26.2 KB
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--[[
Copyright 2017 YANG Huan ([email protected]).
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 ArgumentOutOfRangeException = System.ArgumentOutOfRangeException
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 setmetatable = setmetatable
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 value 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, len)
local usefulInputLength, padding = len, 0
for i = 1, len do
local c = sbyte(s, i)
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, len, t, resultLength)
local i, j, codes, c = 1, 0, 0x000000ff
while true do
if i > len then
goto AllInputConsumed
end
c = sbyte(s, i)
i = i + 1
if c >= 65 then
if c <= 90 then
c = c - 65
elseif c <= 122 then
c = c - 71
end
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
elseif c == 61 then
goto EqualityCharEncountered
else
throw(FormatException("Format_BadBase64Char"))
end
end
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
::EqualityCharEncountered::
if i > len then
codes = sl(codes, 6)
if (band(codes, 0x80000000)) == 0 then
throw(FormatException("Format_BadBase64CharArrayLength"))
end
if 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 do
c = sbyte(s, i)
if c ~= 32 and c ~= 10 and c ~= 13 and c ~= 9 then
break
end
i = i + 1
end
if i == len and sbyte(s, i) == 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
::AllInputConsumed::
if codes ~= 0x000000ff then
throw(FormatException(("Format_BadBase64CharArrayLength")))
end
return j
end
local function fromBase64String(s)
if s == nil then throw(ArgumentNullException("s")) end
local len = #s
while len > 0 do
local lastChar = sbyte(s, len)
if lastChar ~= 32 and lastChar ~= 10 and lastChar ~= 13 and lastChar ~= 9 then
break
end
len = len - 1
end
local resultLength = fromBase64ComputeResultLength(s, len)
local t = {}
FromBase64Decode(s, len, t, resultLength)
return System.arrayFromTable(t, Byte)
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,
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 function checkIndex(value, startIndex, count)
if value == nil then throw(ArgumentNullException("value")) end
local len = #value
if startIndex < 0 or startIndex >= len then
throw(ArgumentOutOfRangeException("startIndex"))
end
if startIndex > len - count then
throw(ArgumentException())
end
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
local 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
if startIndex < 0 or (startIndex >= len and startIndex > 0) then
throw(ArgumentOutOfRangeException("startIndex"))
end
if length < 0 then
throw(ArgumentOutOfRangeException("length"))
end
if startIndex + length > len then
throw(ArgumentException())
end
if length == 0 then
return ""
end
local t = {}
local 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
})