Function from_encoding_name 

pub fn from_encoding_name(name: &Name, diags: &mut Diagnostics) -> CMap

Resolve a font’s /Encoding name to a CMap, failures included.

Never fails. A name that resolves to nothing produces a CMap that decodes fixed two-byte codes and maps every code to itself, and records a diagnostic — that is what the oracle does, and a file with /Encoding /Nonsense renders because of it.

use pdfrum_cmap::{CharCode, Cid, CidSet, CodingScheme, from_encoding_name};
use pdfrum_common::Diagnostics;
use pdfrum_object::Name;

let mut diags = Diagnostics::default();
let cmap = from_encoding_name(&Name::from("Nonsense"), &mut diags);

assert!(!cmap.is_loaded());
assert_eq!(cmap.charset(), CidSet::Unknown);
assert_eq!(cmap.coding_scheme(), CodingScheme::TwoBytes);
assert_eq!(cmap.cid(CharCode(0x1234)), Cid(0x1234));  // identity fallback
assert_eq!(diags.len(), 1);