feat: add postscript mimetype (#55)

Co-authored-by: Lars Kölpin-Freese <LarsKoelpin@users.noreply.github.com>

src/index.spec.ts

@@ -245,10 +245,24 @@ describe("Tests the public API", () => {
     expect(result).toContain("image/jpeg");
   });
 
+  it("detects pdf (Libreoffice export)", () => {
+    // File created using libreoffice writter export to pdf
+    const file = getBytes("a.pdf");
+    const result = filetypemime(file);
+    expect(result).toContain("application/pdf");
+  });
+
+  it("detects poscript (pdf2ps)", () => {
+    // File created using pdf2ps from https://www.ghostscript.com
+    const file = getBytes("a.ps");
+    const result = filetypemime(file);
+    expect(result).toContain("application/postscript");
+
   it("detects svg", () => {
     // File created using https://png2jpg.com
     const file = getBytes("a.svg");
     const result = filetypemime(file);
     expect(result).toContain("image/svg+xml");
+
   });
 });

src/model/pattern-tree.ts

@@ -576,7 +576,11 @@ add("class", ["0xFF", "0xFE"]);
 add("class", ["0xFF", "0xFE"]);
 add("class", ["0xFF", "0xFE", "0x00", "0x00"]);
 
-add("ps", ["0x25", "0x21", "0x50", "0x53"]);
+add("ps", ["0x25", "0x21", "0x50", "0x53"], {
+    mime: "application/postscript",
+    extension: ".ps"
+  }
+);
 add("pdf", ["0x25", "0x50", "0x44", "0x46"], {
   mime: "application/pdf",
   extension: "pdf",