Native Go text extractor from the legacy MS PPT (Microsoft PowerPoint) binary files.
f, err := os.Open("testdata/simplepres.ppt")
if err != nil {
handleErr(err)
}
text, err := goppt.ExtractText(f)
if err != nil {
handleErr(err)
}
fmt.Println(text)
A lot of thanks to https://github.com/richardlehane/mscfb and its author Richard Lehane. It helped a lot with parsing Microsoft old binary format.
Also I am grateful to Alex Rembish with PHP text extraction implementation.