I am looking for a macro package for QR codes applicable in plain TeX. The QR code should be calculated from string at TeX macro level like in qrcode.sty, but this package is usable only for LaTeX.
I have found only solutions based on PostScript language or Lua language. But the same is doable using only TeX macro language as we seen in qrcode.sty.
Knows somebody about such macro package?