content: /*
   * Copyright (C) 2016 The Android Open Source Project
   *
   * 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.android.server.wifi.util;
  
  /** Basic string utilities */
  public class StringUtil {
      static final byte ASCII_PRINTABLE_MIN = ' ';
      static final byte ASCII_PRINTABLE_MAX = '~';
  
      /** Returns true if-and-only-if |byteArray| can be safely printed as ASCII. */
      public static boolean isAsciiPrintable(byte[] byteArray) {
          if (byteArray == null) {
              return true;
          }
  
          for (byte b : byteArray) {
              switch (b) {
                  // Control characters which actually are printable. Fall-throughs are deliberate.
                  case 0x07:      // bell ('\a' not recognized in Java)
                  case '\f':      // form feed
                  case '\n':      // new line
                  case '\t':      // horizontal tab
                  case 0x0b:      // vertical tab ('\v' not recognized in Java)
                      continue;
              }
  
              if (b < ASCII_PRINTABLE_MIN || b > ASCII_PRINTABLE_MAX) {
                  return false;
              }
          }
  
          return true;
      }
  }
  