custom hex_encode/decode impl

mostly for Java 11 compat, but also this is more efficient than the original, albeit lacking some error checks
DenizenScript · Feb 7, 2021 · 67f2940 · 67f2940
1 parent 99a668c
commit 67f2940
Show file tree

Hide file tree

Showing 3 changed files with 41 additions and 4 deletions.
diff --git a/pom.xml b/pom.xml
@@ -109,8 +109,9 @@
                 </executions>
             </plugin>
             <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>2.3.2</version>
+                <version>3.8.0</version>
                 <configuration>
                     <source>1.8</source>
                     <target>1.8</target>

diff --git a/src/main/java/com/denizenscript/denizencore/objects/core/ElementTag.java b/src/main/java/com/denizenscript/denizencore/objects/core/ElementTag.java
@@ -11,7 +11,6 @@
 import com.denizenscript.denizencore.utilities.debugging.Debug;
 import com.denizenscript.denizencore.tags.core.EscapeTagBase;
 
-import javax.xml.bind.DatatypeConverter;
 import java.math.BigDecimal;
 import java.math.BigInteger;
 import java.math.RoundingMode;
@@ -2220,7 +2219,7 @@ else if (CoreUtilities.toLowerCase(element).contains(CoreUtilities.toLowerCase(c
         // Encodes the element using hexadecimal encoding.
         // -->
         registerTag("hex_encode", (attribute, object) -> {
-            String encoded = DatatypeConverter.printHexBinary(object.element.getBytes());
+            String encoded = CoreUtilities.hexEncode(object.element.getBytes());
             return new ElementTag(encoded);
         });
 
@@ -2232,7 +2231,7 @@ else if (CoreUtilities.toLowerCase(element).contains(CoreUtilities.toLowerCase(c
         // Decodes the element using hexadecimal encoding. Must be valid hexadecimal input.
         // -->
         registerTag("hex_decode", (attribute, object) -> {
-            String decoded = new String(DatatypeConverter.parseHexBinary(object.element));
+            String decoded = new String(CoreUtilities.hexDecode(object.element));
             return new ElementTag(decoded);
         });
 

diff --git a/src/main/java/com/denizenscript/denizencore/utilities/CoreUtilities.java b/src/main/java/com/denizenscript/denizencore/utilities/CoreUtilities.java
@@ -715,4 +715,41 @@ else if (m == 0) {
         // actually has the most recent cost counts
         return p[n];
     }
+
+    private static byte[] valueOfHex = new byte[256];
+
+    public static char[] charForByte = "0123456789abcdef".toCharArray();
+
+    static {
+        for (byte i = 0; i < 10; i++) {
+            valueOfHex['0' + i] = i;
+        }
+        for (byte i = 0; i < 6; i++) {
+            valueOfHex['a' + i] = (byte) (i + 10);
+            valueOfHex['A' + i] = (byte) (i + 10);
+        }
+    }
+
+    public static byte[] hexDecode(String str) {
+        byte[] output = new byte[str.length() >> 1];
+        for (int i = 0; i < output.length; i++) {
+            char a = str.charAt(i << 1);
+            char b = str.charAt((i << 1) + 1);
+            byte valA = (byte) (valueOfHex[a] << 4);
+            byte valB = valueOfHex[b];
+            output[i] = (byte) (valA + valB);
+        }
+        return output;
+    }
+
+    public static String hexEncode(byte[] value) {
+        char[] output = new char[value.length * 2];
+        for (int i = 0; i < value.length; i++) {
+            byte valA = (byte) ((value[i] & 0xF0) >> 4);
+            byte valB = (byte) (value[i] & 0x0F);
+            output[i << 1] = charForByte[valA];
+            output[(i << 1) + 1] = charForByte[valB];
+        }
+        return new String(output);
+    }
 }