Use CIDToGIDMap when the font is a type 2 with an OpenType font

It fixes #18062.

Author: calixteman

src/core/cff_parser.js

@@ -255,6 +255,8 @@ class CFFParser {
     const charStringOffset = topDict.getByName("CharStrings");
     const charStringIndex = this.parseIndex(charStringOffset).obj;
 
+    cff.charStringCount = charStringIndex.count;
+
     const fontMatrix = topDict.getByName("FontMatrix");
     if (fontMatrix) {
       properties.fontMatrix = fontMatrix;
@@ -1005,6 +1007,7 @@ class CFF {
     this.fdSelect = null;
 
     this.isCIDFont = false;
+    this.charStringCount = 0;
   }
 
   duplicateFirstGlyph() {

src/core/fonts.js

@@ -60,7 +60,6 @@ import { CFFFont } from "./cff_font.js";
 import { FontRendererFactory } from "./font_renderer.js";
 import { getFontBasicMetrics } from "./metrics.js";
 import { GlyfTable } from "./glyf.js";
-import { IdentityCMap } from "./cmap.js";
 import { OpenTypeFileBuilder } from "./opentype_file_builder.js";
 import { readUint32 } from "./core_utils.js";
 import { Stream } from "./stream.js";
@@ -2638,27 +2637,23 @@ class Font {
       header = readOpenTypeHeader(font);
       tables = readTables(font, header.numTables);
     }
-    let cff, cffFile;
 
     const isTrueType = !tables["CFF "];
     if (!isTrueType) {
-      const isComposite =
-        properties.composite &&
-        (properties.cidToGidMap?.length > 0 ||
-          !(properties.cMap instanceof IdentityCMap));
       // OpenType font (skip composite fonts with non-default glyph mapping).
       if (
-        (header.version === "OTTO" && !isComposite) ||
+        (header.version === "OTTO" && !properties.composite) ||
         !tables.head ||
         !tables.hhea ||
         !tables.maxp ||
         !tables.post
       ) {
         // No major tables: throwing everything at `CFFFont`.
-        cffFile = new Stream(tables["CFF "].data);
-        cff = new CFFFont(cffFile, properties);
-
-        return this.convert(name, cff, properties);
+        return this.convert(
+          name,
+          new CFFFont(new Stream(tables["CFF "].data), properties),
+          properties
+        );
       }
 
       delete tables.glyf;
@@ -2686,9 +2681,32 @@ class Font {
       throw new FormatError('Required "maxp" table is not found');
     }
 
+    let numGlyphsFromCFF;
+    if (!isTrueType) {
+      try {
+        // Trying to repair CFF file
+        const parser = new CFFParser(
+          new Stream(tables["CFF "].data),
+          properties,
+          SEAC_ANALYSIS_ENABLED
+        );
+        const cff = parser.parse();
+        cff.duplicateFirstGlyph();
+        const compiler = new CFFCompiler(cff);
+        tables["CFF "].data = compiler.compile();
+        numGlyphsFromCFF = cff.charStringCount;
+      } catch {
+        warn("Failed to compile font " + properties.loadedName);
+      }
+    }
+
     font.pos = (font.start || 0) + tables.maxp.offset;
     let version = font.getInt32();
-    const numGlyphs = font.getUint16();
+    const numGlyphs = numGlyphsFromCFF ?? font.getUint16();
+    if (version === 0x00005000 && tables.maxp.length !== 6) {
+      tables.maxp.data = tables.maxp.data.subarray(0, 6);
+      tables.maxp.length = 6;
+    }
 
     if (version !== 0x00010000 && version !== 0x00005000) {
       // https://learn.microsoft.com/en-us/typography/opentype/spec/maxp
@@ -3099,24 +3117,6 @@ class Font {
       }
     }
 
-    if (!isTrueType) {
-      try {
-        // Trying to repair CFF file
-        cffFile = new Stream(tables["CFF "].data);
-        const parser = new CFFParser(
-          cffFile,
-          properties,
-          SEAC_ANALYSIS_ENABLED
-        );
-        cff = parser.parse();
-        cff.duplicateFirstGlyph();
-        const compiler = new CFFCompiler(cff);
-        tables["CFF "].data = compiler.compile();
-      } catch {
-        warn("Failed to compile font " + properties.loadedName);
-      }
-    }
-
     // Re-creating 'name' table
     if (!tables.name) {
       tables.name = {

test/pdfs/issue18062.pdf.link

@@ -0,0 +1 @@
+https://github.com/mozilla/pdf.js/files/15274065/1.pdf

test/test_manifest.json

@@ -13123,5 +13123,13 @@
     "rounds": 1,
     "link": true,
     "type": "eq"
+  },
+  {
+    "id": "issue18062",
+    "file": "pdfs/issue18062.pdf",
+    "md5": "b8fb6d5622f0a2f45be8e26da7de969c",
+    "rounds": 1,
+    "link": true,
+    "type": "eq"
   }
 ]