fix(pdf-cos): fix Rust test failures

- .gitignore: unblock assets/*.pdf so fixture PDFs are committed
  (tests need example.pdf, encrypted.pdf, Incremental.pdf, unicode.pdf,
  AnnotationDemo.pdf at compile time and integration test runtime)
- parser: accept bare \n in xref_eol (in addition to ' \r', ' \n',
  '\r\n') so that lenient/non-standard xref tables are parsed correctly;
  fixes big_generation_value test

Author: raphaelmansuy

crates/pdf-cos/.gitignore

@@ -1,7 +1,10 @@
 target
 Cargo.lock
+# Generated test output PDFs (created/modified by tests)
 test*.pdf
 *.pdf
+# Allow fixture PDFs in assets/ — needed by doc-tests and integration tests
+!assets/*.pdf
 .idea
 *log.txt
 specs

crates/pdf-cos/assets/AnnotationDemo.pdf

@@ -459,7 +459,7 @@ pub fn binary_mark(input: ParserInput) -> Option<Vec<u8>> {
 
 /// Decode CrossReferenceTable
 fn xref(input: ParserInput) -> NomResult<Xref> {
-    let xref_eol = map(alt((tag(&b" \r"[..]), tag(&b" \n"[..]), tag(&b"\r\n"[..]))), |_| ());
+    let xref_eol = map(alt((tag(&b" \r"[..]), tag(&b" \n"[..]), tag(&b"\r\n"[..]), tag(&b"\n"[..]))), |_| ());
     let xref_entry = pair(
         separated_pair(unsigned_int, tag(&b" "[..]), unsigned_int::<u32>),
         delimited(tag(&b" "[..]), map(one_of("nf"), |k| k == 'n'), xref_eol),