[Color] ColorResourcesTableCreator: Fix length encoding for utf8 strings

Resolves #4710

GIT_ORIGIN_REV_ID=93cfc26eaac6aff2e6ec1e80123f4eb2d98b42b7
PiperOrigin-RevId: 750282052

Author: pubiqq

lib/java/com/google/android/material/color/ColorResourcesTableCreator.java

@@ -16,12 +16,13 @@
 
 package com.google.android.material.color;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import android.content.Context;
 import android.util.Pair;
 import androidx.annotation.ColorInt;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
-import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;
@@ -630,13 +631,36 @@ private static byte[] stringToByteArray(String value) {
     return bytes;
   }
 
-  private static byte[] stringToByteArrayUtf8(String value) {
-    byte[] rawBytes = value.getBytes(Charset.forName("UTF-8"));
-    byte stringLength = (byte) rawBytes.length;
-    byte[] bytes = new byte[rawBytes.length + 3];
-    System.arraycopy(rawBytes, 0, bytes, 2, stringLength);
-    bytes[0] = bytes[1] = stringLength;
-    bytes[bytes.length - 1] = 0; // EOS
-    return bytes;
+  private static byte[] stringToByteArrayUtf8(String str) {
+    byte[] strBytes = str.getBytes(UTF_8);
+    byte[] strLengthBytes = encodeLengthUtf8((short) str.length());
+    byte[] encStrLengthBytes = encodeLengthUtf8((short) strBytes.length);
+
+    return concat(
+        strLengthBytes,
+        encStrLengthBytes,
+        strBytes,
+        new byte[] { 0 }  // EOS
+    );
+  }
+
+  private static byte[] encodeLengthUtf8(short length) {
+    return length > 0x7F
+        ? new byte[] { (byte) (((length >> 8) & 0x7F) | 0x80), (byte) (length & 0xFF) }
+        : new byte[] { (byte) (length & 0xFF) };
+  }
+
+  private static byte[] concat(byte[]... arrays) {
+    int length = 0;
+    for (byte[] array : arrays) {
+      length += array.length;
+    }
+    byte[] result = new byte[length];
+    int pos = 0;
+    for (byte[] array : arrays) {
+      System.arraycopy(array, 0, result, pos, array.length);
+      pos += array.length;
+    }
+    return result;
   }
 }