1e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal/* 2e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal * Copyright (C) 2016 The Android Open Source Project 3e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal * 4e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal * Licensed under the Apache License, Version 2.0 (the "License"); 5e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal * you may not use this file except in compliance with the License. 6e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal * You may obtain a copy of the License at 7e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal * 8e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal * http://www.apache.org/licenses/LICENSE-2.0 9e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal * 10e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal * Unless required by applicable law or agreed to in writing, software 11e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal * distributed under the License is distributed on an "AS IS" BASIS, 12e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal * See the License for the specific language governing permissions and 14e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal * limitations under the License. 15e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal */ 16e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal 17e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawalpackage com.android.server.wifi.util; 18e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal 19e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal/** Basic string utilities */ 20e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawalpublic class StringUtil { 21e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal static final byte ASCII_PRINTABLE_MIN = ' '; 22e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal static final byte ASCII_PRINTABLE_MAX = '~'; 23e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal 24e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal /** Returns true if-and-only-if |byteArray| can be safely printed as ASCII. */ 25e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal public static boolean isAsciiPrintable(byte[] byteArray) { 26e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal if (byteArray == null) { 27e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal return true; 28e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal } 29e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal 30e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal for (byte b : byteArray) { 31e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal switch (b) { 32e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal // Control characters which actually are printable. Fall-throughs are deliberate. 33e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal case 0x07: // bell ('\a' not recognized in Java) 34e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal case '\f': // form feed 35e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal case '\n': // new line 36e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal case '\t': // horizontal tab 37e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal case 0x0b: // vertical tab ('\v' not recognized in Java) 38e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal continue; 39e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal } 40e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal 41e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal if (b < ASCII_PRINTABLE_MIN || b > ASCII_PRINTABLE_MAX) { 42e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal return false; 43e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal } 44e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal } 45e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal 46e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal return true; 47e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal } 48e31290e1c2eebf70c5ab22091a9520c7a001161emukesh agrawal} 49