Get-FileEncoding.ps1
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function Get-FileEncoding { [CmdletBinding()] param ( [Parameter(Mandatory)] [string]$path ) if (!(Test-Path $path -PathType Leaf)) { Write-Error "File not found: $path" } if (!(Get-Content $path)) { return "UTF8" } if ($PSVersionTable.PSVersion.Major -le 5) { [byte[]]$byte = Get-Content -Encoding Byte -ReadCount 4 -TotalCount 4 -Path $path } else { [byte[]]$byte = Get-Content -AsByteStream -ReadCount 4 -TotalCount 4 -Path $path } # EF BB BF (UTF8) if ( $byte[0] -eq 0xef -and $byte[1] -eq 0xbb -and $byte[2] -eq 0xbf ) { return "UTF8" } # FE FF (UTF-16 Big-Endian) elseif ($byte[0] -eq 0xfe -and $byte[1] -eq 0xff) { return "Unicode UTF-16 Big-Endian" } # FF FE (UTF-16 Little-Endian) elseif ($byte[0] -eq 0xff -and $byte[1] -eq 0xfe) { return "Unicode UTF-16 Little-Endian" } # 00 00 FE FF (UTF32 Big-Endian) elseif ($byte[0] -eq 0 -and $byte[1] -eq 0 -and $byte[2] -eq 0xfe -and $byte[3] -eq 0xff) { return "UTF32 Big-Endian" } # FE FF 00 00 (UTF32 Little-Endian) elseif ($byte[0] -eq 0xfe -and $byte[1] -eq 0xff -and $byte[2] -eq 0 -and $byte[3] -eq 0) { return "UTF32 Little-Endian" } # 2B 2F 76 (38 | 38 | 2B | 2F) elseif ($byte[0] -eq 0x2b -and $byte[1] -eq 0x2f -and $byte[2] -eq 0x76 -and ($byte[3] -eq 0x38 -or $byte[3] -eq 0x39 -or $byte[3] -eq 0x2b -or $byte[3] -eq 0x2f) ) { return "UTF7" } # F7 64 4C (UTF-1) elseif ( $byte[0] -eq 0xf7 -and $byte[1] -eq 0x64 -and $byte[2] -eq 0x4c ) { return "UTF-1" } # DD 73 66 73 (UTF-EBCDIC) elseif ($byte[0] -eq 0xdd -and $byte[1] -eq 0x73 -and $byte[2] -eq 0x66 -and $byte[3] -eq 0x73) { return "UTF-EBCDIC" } # 0E FE FF (SCSU) elseif ( $byte[0] -eq 0x0e -and $byte[1] -eq 0xfe -and $byte[2] -eq 0xff ) { return "SCSU" } # FB EE 28 (BOCU-1) elseif ( $byte[0] -eq 0xfb -and $byte[1] -eq 0xee -and $byte[2] -eq 0x28 ) { return "BOCU-1" } # 84 31 95 33 (GB-18030) elseif ($byte[0] -eq 0x84 -and $byte[1] -eq 0x31 -and $byte[2] -eq 0x95 -and $byte[3] -eq 0x33) { return "GB-18030" } else { return "UTF8" } } |