VirtualEngine.Build

1.0.78

Src/Public/Get-FileEncoding.ps1

                                function Get-FileEncoding {

<#

.SYNOPSIS

    Gets file encoding.

.DESCRIPTION

    The Get-FileEncoding function determines encoding by looking at Byte Order Mark (BOM).

    Based on port of C# code from http://www.west-wind.com/Weblog/posts/197245.aspx

.OUTPUTS

    System.Text.Encoding

.PARAMETER Path

    The Path of the file that we want to check.

.PARAMETER DefaultEncoding

    The Encoding to return if one cannot be inferred.

    You may prefer to use the System's default encoding:  [System.Text.Encoding]::Default

    List of available Encodings is available here: http://goo.gl/GDtzj7

.EXAMPLE

    # This command gets ps1 files in current directory where encoding is not ASCII

    Get-ChildItem  *.ps1 | select FullName, @{n='Encoding';e={Get-FileEncoding $_.FullName}} | where {[string]$_.Encoding -ne 'System.Text.ASCIIEncoding'}

.EXAMPLE

    # Same as previous example but fixes encoding using set-content

    Get-ChildItem  *.ps1 | select FullName, @{n='Encoding';e={Get-FileEncoding $_.FullName}} | where {[string]$_.Encoding -ne 'System.Text.ASCIIEncoding'} | foreach {(get-content $_.FullName) | set-content $_.FullName -Encoding ASCII}

.NOTES

    Version History

    v1.0   - 2010/08/10, Chad Miller - Initial release

    v1.1   - 2010/08/16, Jason Archer - Improved pipeline support and added detection of little endian BOMs. (http://poshcode.org/2075)

    v1.2   - 2015/02/03, VertigoRay - Adjusted to use .NET's [System.Text.Encoding Class](http://goo.gl/XQNeuc). (http://poshcode.org/5724)

.LINK

    https://vertigion.com/2015/02/04/powershell-get-fileencoding/

#>

    [CmdletBinding()]

    param (

        [Alias("PSPath")]

        [Parameter(Mandatory = $True, ValueFromPipelineByPropertyName = $True)]

        [String]$Path

        ,

        [Parameter(Mandatory = $False)]

        [System.Text.Encoding]$DefaultEncoding = [System.Text.Encoding]::ASCII

    )

    process {

        [Byte[]]$bom = Get-Content -Encoding Byte -ReadCount 4 -TotalCount 4 -Path $Path

        $encoding_found = $false

        foreach ($encoding in [System.Text.Encoding]::GetEncodings().GetEncoding()) {

            $preamble = $encoding.GetPreamble()

            if ($preamble) {

                foreach ($i in 0..$preamble.Length) {

                    if ($preamble[$i] -ne $bom[$i]) {

                        break

                    } elseif ($i -eq $preable.Length) {

                        $encoding_found = $encoding

                    }

                }

            }

        }

        if (!$encoding_found) {

            Write-Warning -Message ($localized.NoFileEncodingFoundWarning -f $Path);

            $encoding_found = $DefaultEncoding

        }

        $encoding_found

    } #process

} #function

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