Public/Get-ImageCodecInfo.ps1
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# Table of file signatures (aka "magic numbers") # https://www.garykessler.net/library/file_sigs.html function Get-ImageCodecInfo { [CmdletBinding()] param ( [Parameter(Mandatory = $true, Position = 0 )] $Image ) begin { Write-Verbose "Cmdlet Get-ImageCodecInfo - Begin" } process { Write-Verbose "Cmdlet Get-ImageCodecInfo - Process" $isByte = Test-ByteArrayType $Image $isStream = Test-StreamType $Image if (!$isByte -and !$isStream ) { throw [System.ArgumentException]::new("Invalid input. Accepted types are: [System.IO.Stream] and [System.Byte[]]") } if ($isStream) { $Image = $Image.ToArray() } [System.Drawing.Imaging.ImageCodecInfo]::GetImageEncoders() | ? { [byte[]]$pattern = $_.SignaturePatterns | Select-Object -First 1 [byte[]]$header = $Image | Select-Object -First $pattern.Length [System.Linq.Enumerable]::SequenceEqual([byte[]]$pattern, [byte[]]$header) } | Select-Object -First 1 } end { Write-Verbose "Cmdlet Get-ImageCodecInfo - End" } } |