Support Type1 font files with incomplete /CharStrings definitions (issue 14462)

Please refer to https://www.pdfa.org/norm-refs/Type1Fonts.pdf#page=15 for the expected format for the /CharStrings entries.
In the referenced PDF document the /CharStrings are missing the expected end-token, which causes us to swallow the start of the next glyph name.

src/core/type1_parser.js

@@ -512,6 +512,11 @@ const Type1Parser = (function Type1ParserClosure() {
       return (this.currentChar = this.stream.getByte());
     }
 
+    prevChar() {
+      this.stream.skip(-2);
+      return (this.currentChar = this.stream.getByte());
+    }
+
     getToken() {
       // Eat whitespace and comments.
       let comment = false;
@@ -604,6 +609,10 @@ const Type1Parser = (function Type1ParserClosure() {
               token = this.getToken(); // read in 'ND' or '|-'
               if (token === "noaccess") {
                 this.getToken(); // read in 'def'
+              } else if (token === "/") {
+                // The expected 'ND' or '|-' token is missing, avoid swallowing
+                // the start of the next glyph (fixes issue14462_reduced.pdf).
+                this.prevChar();
               }
               charstrings.push({
                 glyph,

test/pdfs/.gitignore

@@ -483,6 +483,7 @@
 !tiling-pattern-box.pdf
 !tiling-pattern-large-steps.pdf
 !issue13201.pdf
+!issue14462_reduced.pdf
 !issue11555.pdf
 !issue12337.pdf
 !pr12564.pdf

test/test_manifest.json

@@ -3699,6 +3699,12 @@
        "link": true,
        "type": "eq"
     },
+    {  "id": "issue14462",
+       "file": "pdfs/issue14462_reduced.pdf",
+       "md5": "afe38169322f8e124eaeae00f94ea596",
+       "rounds": 1,
+       "type": "eq"
+    },
     {  "id": "preistabelle",
       "file": "pdfs/preistabelle.pdf",
       "md5": "d2f0b2086160d4f3d325c79a5dc1fb4d",