# encoding: ascii
# api: powershell
# title: docx2txt wi'out MSOffice
# description: Original post found at http://www.cyberforum.ru/post8436749.html
# version: 0.1
# type: function
# author: govnyakha
# license: CC0
# function: Convert-Docx2Text
# x-poshcode-id: 6131
# x-archived: 2016-03-18T21:47:08
# x-published: 2016-12-04T10:20:00
#
#
#requires -version 2
function Convert-Docx2Text {
<#
.SYNOPSIS
Converts DOCX to TXT file without MS Office.
.DESCRIPTION
Creates text file in the same directory where original document
is placed. This demo function does not use third party tools or
libraries.
.EXAMPLE
PS C:\Users\Admin\Documents> Convert-Docx2Text pecoff_v83.docx
#>
param(
[Parameter(Mandatory=$true)]
[ValidateScript({Test-Path $_})]
[String]$FileName
)
begin {
# MIME of DOCX is application/x-zip-compressed
$FindMimeFromData = {
[OutputType([String])]
param(
[Parameter(Mandatory=$true)]
[ValidateNotNullOrEmpty()]
[String]$FileName
)
Add-Type -AssemblyName ($$ = 'PresentationCore')
try {
$fs = [IO.File]::OpenRead($FileName)
if (($len = $fs.Length) -gt 4096) { $len = 4096 }
$buf = New-Object "Byte[]" $len
[void]$fs.Read($buf, 0, $buf.Length)
$gch = [Runtime.InteropServices.GCHandle]::Alloc($buf, 'Pinned')
$ptr = $gch.AddrOfPinnedObject()
if (([AppDomain]::CurrentDomain.GetAssemblies() | ? {
$_.ManifestModule.ScopeName.Equals("$$.dll")
}).GetType(
'MS.Win32.Compile.UnsafeNativeMethods'
).GetMethod(
'FindMimeFromData', [Reflection.BindingFlags]40
).Invoke($null, (
$$ = [Object[]]($null, $FileName, $ptr, [Int32]$len, $null, 0, $mime, 0)
)) -ne 0) {
throw New-Object Exception('Could not get MIME type.')
}
}
catch { $_.Exception }
finally {
if ($gch -ne $null) { $gch.Free() }
if ($fs -ne $null) { $fs.Close() }
}
$$[6] # MIME
}
$FileName = Convert-Path $FileName
}
process {
# check MIME and extension of input file
if (($ext = (Get-Item $FileName).Extension) -ne '.docx'-and
$FindMimeFromData.Invoke($FileName) -ne 'application/x-zip-compressed'
) {
Write-Warning 'unsupported file format.'
}
# locate word/document.xml deflated data
try {
$fs = [IO.File]::OpenRead($FileName)
$br = New-Object IO.BinaryReader($fs)
while ($true) {
if ($br.ReadUInt32() -ne 67324752) {break} # no more local headers
$fs.Position += 14
$csz = $br.ReadUInt32() # compressed size of data (can be skipped?)
$fs.Position += 4
$fnl = $br.ReadUInt16() # file name length
$efl = $br.ReadUInt16() # extra field length
if ((-join $br.ReadChars($fnl)) -eq 'word/document.xml') {
$fs.Position += $efl # skip extra field data
try { # extract compressed data (xml)
$ds = New-Object IO.Compression.DeflateStream($fs, 'Decompress')
$of = [IO.File]::Create(($$ = $FileName -replace $ext, '.txt'))
while ($true) {
$buf = New-Object "Byte[]" 100
$get = $ds.Read($buf, 0, $buf.Length)
$of.Write($buf, 0, $get)
if ($get -ne $buf.Length) {break}
}
}
catch { $_.Exception }
finally {
if ($of -ne $null) { $of.Close() }
if ($ds -ne $null) { $ds.Close() }
}
break
}
$fs.Position += $efl + $csz
}
}
catch { $_.Exception }
finally {
if ($br -ne $null) { $br.Close() }
if ($fs -ne $null) { $fs.Close() }
}
}
end {
if (Test-Path $$) { # convert xml to text
$xml = [xml](Get-Content $$)
Out-File $$ -InputObject $xml.document.InnerText -Encoding Default
}
}
}