PDFBOX-5902: replace Map with List

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1922540 13f79535-47bb-0310-9956-ffa450edef68

fontbox/src/main/java/org/apache/fontbox/cmap/CMapStrings.java

@@ -18,17 +18,17 @@
 package org.apache.fontbox.cmap;
 
 import java.nio.charset.StandardCharsets;
-import java.util.HashMap;
-import java.util.Map;
+import java.util.ArrayList;
+import java.util.List;
 
 /**
  * Many CMaps are using the same values for the mapped strings. This class provides all common one- and two-byte
  * mappings to avoid duplicate strings.
  */
 public class CMapStrings
 {
-    private static final Map<Integer, String> twoByteMappings = new HashMap<>();
-    private static final Map<Integer, String> oneByteMappings = new HashMap<>();
+    private static final List<String> twoByteMappings = new ArrayList<>(256 * 256);
+    private static final List<String> oneByteMappings = new ArrayList<>(256);
 
     static
     {
@@ -47,14 +47,13 @@ private static void fillMappings()
             for (int j = 0; j < 256; j++)
             {
                 byte[] bytes = { (byte) i, (byte) j };
-                twoByteMappings.put(CMap.toInt(bytes),
-                        new String(bytes, StandardCharsets.UTF_16BE));
+                twoByteMappings.add(new String(bytes, StandardCharsets.UTF_16BE));
             }
         }
         for (int i = 0; i < 256; i++)
         {
             byte[] bytes = { (byte) i };
-            oneByteMappings.put(i, new String(bytes, StandardCharsets.ISO_8859_1));
+            oneByteMappings.add(new String(bytes, StandardCharsets.ISO_8859_1));
         }
     }