PWG Raster Format

import magic
# Note: Due to its specialized use in IPP print spools, libmagic may just identify it generically as a CUPS raster file
print(magic.from_file('print_job.pwg', mime=True)) # May output 'application/vnd.cups-raster'

const fs = require('fs');
// Manually detecting the 'RaS2' magic string used by PWG Raster
const buffer = Buffer.alloc(4);
const fd = fs.openSync('print_job.pwg', 'r');
fs.readSync(fd, buffer, 0, 4, 0);
fs.closeSync(fd);
const isPWGRaster = buffer.toString('ascii') === 'RaS2';
console.log(isPWGRaster);

import "net/http"
// http.DetectContentType will not recognize this format. You must sniff the byte prefix directly.
// isPWG := bytes.HasPrefix(buf, []byte("RaS2"))

// Standard web environments rarely encounter this format. It is primarily passed via HTTP POST requests to an IPP printer URI (e.g., /ipp/print).