unknown string pool reference coder #18

src/main/java/com/reandroid/arsc/coder/CoderUnknownStringRef.java

@@ -0,0 +1,58 @@
+/*
+ *  Copyright (C) 2022 github.com/REAndroid
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.reandroid.arsc.coder;
+
+import com.reandroid.arsc.value.ValueType;
+import com.reandroid.utils.HexUtil;
+
+/**
+ * Handles when the string reference is not available on string pool
+ * */
+public class CoderUnknownStringRef extends Coder {
+
+    @Override
+    public EncodeResult encode(String text) {
+        if(text == null || text.length() != LENGTH){
+            return null;
+        }
+        String prefix = PREFIX;
+        if(!text.startsWith(prefix)){
+            return null;
+        }
+        Integer value = parseHex(text.substring(prefix.length() + 1));
+        if(value != null){
+            return new EncodeResult(ValueType.STRING, value);
+        }
+        return null;
+    }
+    @Override
+    public String decode(int data) {
+        return HexUtil.toHex8(PREFIX, data);
+    }
+    @Override
+    public ValueType getValueType() {
+        return ValueType.STRING;
+    }
+    @Override
+    boolean canStartWith(char first) {
+        return first == PREFIX_CHAR;
+    }
+    public static final CoderUnknownStringRef INS = new CoderUnknownStringRef();
+
+    private static final char PREFIX_CHAR = 's';
+    private static final String PREFIX = "string-reference@0x";
+    private static final int LENGTH = PREFIX.length() + 8;
+}