$byte =[io.file]::ReadAllBytes($Args[0])

$d=[Text.DecoderReplacementFallback]::new('?')
$e=[Text.EncoderReplacementFallback]::new('?')
$cgbk=[text.encoding]::GetEncoding(936,$e,$d)
$cutf8=[text.encoding]::GetEncoding(65001,$e,$d)

$StrEncode='ANSI'

if($byte.length -le 512){$l=$byte.length} else{$l=512}
echo "test $l bytes"

if ($byte[0] -eq 0xEF -and $byte[1] -eq 0xBB){
$StrEncode='UTF-8BOM'
} else{
$b=$cgbk.GetBytes($cgbk.GetString($byte,0,$l))
if($l -eq 512){$l-=16}
for($i=0;$i -lt $l;$i++){
if($b[$i] -ne $byte[$i] ){$StrEncode='UTF-8';break}
}
}

echo "maybe $StrEncode"

if($StrEncode -eq 'UTF-8BOM'){
echo "convert $StrEncode to ANSI"
[io.file]::WriteAllText($Args[1],$cutf8.GetString($byte,3,$byte.length-3),$cgbk)
}
if($StrEncode -eq 'UTF-8'){
echo "convert $StrEncode to ANSI"
[io.file]::WriteAllText($Args[1],$cutf8.GetString($byte,0,$byte.length),$cgbk)
}
if($StrEncode -eq 'ANSI'){}
echo "`r`n"
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@echo off
cd /d "%~dp0"
set "FolderStageU=TempUTF8BOM"
set "FolderOutA=FinalANSI"
md "%FolderStageU%" 2>nul
md "%FolderOutA%" 2>nul
for /f "delims=" %%a in ('dir /b /a-d *.txt') do (
echo %%a
powershell -ExecutionPolicy bypass -f ChangeCoding.ps1 "%%~fa" "%~dp0%FolderOutA%\%%a"
)
pause
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