404 Not Found

import { isPdfBuffer } from "../pdfUtils"; describe("isPdfBuffer", () => { it("detects a standard PDF-1.4 header", () => { const buf = Buffer.from("%PDF-1.4 rest of file..."); expect(isPdfBuffer(buf)).toBe(true); }); it("detects a PDF-2.0 header", () => { const buf = Buffer.from("%PDF-2.0\n"); expect(isPdfBuffer(buf)).toBe(true); }); it("detects %PDF with a UTF-8 BOM prefix", () => { const bom = Buffer.from([0xef, 0xbb, 0xbf]); const pdf = Buffer.from("%PDF-1.7"); expect(isPdfBuffer(Buffer.concat([bom, pdf]))).toBe(true); }); it("detects %PDF preceded by whitespace/newlines", () => { const buf = Buffer.from(" \n\r\n%PDF-1.5 data..."); expect(isPdfBuffer(buf)).toBe(true); }); it("detects %PDF preceded by junk bytes within 1KB", () => { const junk = Buffer.alloc(500, 0x00); const pdf = Buffer.from("%PDF-1.4 rest..."); expect(isPdfBuffer(Buffer.concat([junk, pdf]))).toBe(true); }); it("rejects %PDF that appears after the 1KB window", () => { const padding = Buffer.alloc(1024, 0x20); // 1024 spaces const pdf = Buffer.from("%PDF-1.4"); expect(isPdfBuffer(Buffer.concat([padding, pdf]))).toBe(false); }); it("rejects HTML content", () => { const buf = Buffer.from( "Not a PDF", ); expect(isPdfBuffer(buf)).toBe(false); }); it("rejects plain text", () => { const buf = Buffer.from("Hello, this is just a text file."); expect(isPdfBuffer(buf)).toBe(false); }); it("rejects an empty buffer", () => { expect(isPdfBuffer(Buffer.alloc(0))).toBe(false); }); it("rejects a buffer shorter than the magic bytes", () => { const buf = Buffer.from("%PD"); expect(isPdfBuffer(buf)).toBe(false); }); it("rejects a buffer containing only part of the magic", () => { const buf = Buffer.from("%PD\x00\x00\x00"); expect(isPdfBuffer(buf)).toBe(false); }); it("rejects a 404 HTML error page", () => { const buf = Buffer.from( "404 Not FoundNot Found", ); expect(isPdfBuffer(buf)).toBe(false); }); it("rejects JSON response", () => { const buf = Buffer.from('{"error": "not found"}'); expect(isPdfBuffer(buf)).toBe(false); }); it("handles exactly 4-byte %PDF buffer", () => { const buf = Buffer.from("%PDF"); expect(isPdfBuffer(buf)).toBe(true); }); it("detects %PDF at the boundary of the 1KB window", () => { // Place %PDF so it ends exactly at byte 1024 const padding = Buffer.alloc(1020, 0x41); // 1020 'A's const pdf = Buffer.from("%PDF"); expect(isPdfBuffer(Buffer.concat([padding, pdf]))).toBe(true); }); });