| /* |
| * 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; |
| } |
| } |