Function isBinary

plugins/plugin-print/src/load-bitmap-font.ts:18–31

(buf: Buffer | string)

const HEADER = Buffer.from([66, 77, 70, 3]);

function isBinary(buf: Buffer | string) {
  if (typeof buf === "string") {
    return buf.substring(0, 3) === "BMF";
  }

  const startOfHeader = buf.slice(0, 4);

  return (
    buf.length > 4 &&
    startOfHeader[0] === HEADER[0] &&
    startOfHeader[1] === HEADER[1] &&
    startOfHeader[2] === HEADER[2]
  );
}

export interface LoadedFont {
  chars: BmCharacter[];