ProgmemBytes_Esp8266_FromOrToFile.ps1

#from HEX to FIle
$z = "0x1F, 0x8B, 0x08, 0x08"
$y = $z -replace " |,|0x|`n|`r", ""
Convert-HexToByteArray($y) |  Set-Content template_default.html.gz -Encoding Byte


#from file to HEX
$y = Get-Content template_default.html.gz -Encoding Byte
Convert-ByteArrayToHex($y)
$y.Length

#https://www.reddit.com/r/PowerShell/comments/5rhjsy/hex_to_byte_array_and_back/

Function Convert-HexToByteArray {
    [cmdletbinding()]
    param(
        [parameter(Mandatory=$true)]
        [String]
        $HexString
    )

    $Bytes = [byte[]]::new($HexString.Length / 2)

    For($i=0; $i -lt $HexString.Length; $i+=2){
        $Bytes[$i/2] = [convert]::ToByte($HexString.Substring($i, 2), 16)
    }

    $Bytes
}

Function Convert-ByteArrayToHex {
    [cmdletbinding()]
    param(
        [parameter(Mandatory=$true)]
        [Byte[]]
        $Bytes
    )

    $HexString = [System.Text.StringBuilder]::new();
	
	$i=0;
    ForEach($byte in $Bytes){
        $HexString.AppendFormat("0x{0:x2}, ", $byte) | Out-Null
		$i++;
		if($i -eq 15){
			$i=0;
			$HexString.Append("`r`n")  | Out-Null
		}
    }

    $HexString.ToString()
}