Generate ToUnicodeMap bfrange in multiple ranges (#1498)

foliojs · Feb 24, 2024 · f4dd1a8 · f4dd1a8
1 parent 485b7e6
commit f4dd1a8
Showing 1 changed file with 10 additions and 1 deletion.
diff --git a/lib/font/embedded.js b/lib/font/embedded.js
@@ -252,6 +252,15 @@ class EmbeddedFont extends PDFFont {
       entries.push(`<${encoded.join(' ')}>`);
     }
 
+    const chunkSize = 256;
+    const chunks = Math.ceil(entries.length / chunkSize);
+    const ranges = [];
+    for (let i = 0; i < chunks; i++) {
+      const start = i * chunkSize;
+      const end = Math.min((i + 1) * chunkSize, entries.length);
+      ranges.push(`<${toHex(start)}> <${toHex(end - 1)}> [${entries.slice(start, end).join(' ')}]`);
+    }
+
     cmap.end(`\
 /CIDInit /ProcSet findresource begin
 12 dict begin
@@ -267,7 +276,7 @@ begincmap
 <0000><ffff>
 endcodespacerange
 1 beginbfrange
-<0000> <${toHex(entries.length - 1)}> [${entries.join(' ')}]
+${ranges.join('\n')}
 endbfrange
 endcmap
 CMapName currentdict /CMap defineresource pop