1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.net.wifi.aware; 18 19 /** 20 * Provides utilities for the Wifi Aware manager/service. 21 * 22 * @hide 23 */ 24 public class WifiAwareUtils { 25 /** 26 * Per spec: The Service Name is a UTF-8 encoded string from 1 to 255 bytes in length. The 27 * only acceptable single-byte UTF-8 symbols for a Service Name are alphanumeric values (A-Z, 28 * a-z, 0-9), the hyphen ('-'), and the period ('.'). All valid multi-byte UTF-8 characters 29 * are acceptable in a Service Name. 30 */ validateServiceName(byte[] serviceNameData)31 public static void validateServiceName(byte[] serviceNameData) throws IllegalArgumentException { 32 if (serviceNameData == null) { 33 throw new IllegalArgumentException("Invalid service name - null"); 34 } 35 36 if (serviceNameData.length < 1 || serviceNameData.length > 255) { 37 throw new IllegalArgumentException("Invalid service name length - must be between " 38 + "1 and 255 bytes (UTF-8 encoding)"); 39 } 40 41 int index = 0; 42 while (index < serviceNameData.length) { 43 byte b = serviceNameData[index]; 44 if ((b & 0x80) == 0x00) { 45 if (!((b >= '0' && b <= '9') || (b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z') 46 || b == '-' || b == '.')) { 47 throw new IllegalArgumentException("Invalid service name - illegal characters," 48 + " allowed = (0-9, a-z,A-Z, -, .)"); 49 } 50 } 51 ++index; 52 } 53 } 54 } 55