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/*
* 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;
}
}
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