93 lines
2.6 KiB
Java
93 lines
2.6 KiB
Java
/**
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* Copyright (C) 2014 Open Whisper Systems
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.whispersystems.textsecure.internal.util;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.security.NoSuchAlgorithmException;
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import java.security.SecureRandom;
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public class Util {
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public static byte[][] split(byte[] input, int firstLength, int secondLength) {
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byte[][] parts = new byte[2][];
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parts[0] = new byte[firstLength];
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System.arraycopy(input, 0, parts[0], 0, firstLength);
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parts[1] = new byte[secondLength];
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System.arraycopy(input, firstLength, parts[1], 0, secondLength);
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return parts;
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}
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public static boolean isEmpty(String value) {
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return value == null || value.trim().length() == 0;
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}
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public static byte[] getSecretBytes(int size) {
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try {
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byte[] secret = new byte[size];
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SecureRandom.getInstance("SHA1PRNG").nextBytes(secret);
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return secret;
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} catch (NoSuchAlgorithmException e) {
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throw new AssertionError(e);
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}
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}
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public static String readFully(InputStream in) throws IOException {
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ByteArrayOutputStream bout = new ByteArrayOutputStream();
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byte[] buffer = new byte[4096];
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int read;
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while ((read = in.read(buffer)) != -1) {
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bout.write(buffer, 0, read);
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}
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in.close();
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return new String(bout.toByteArray());
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}
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public static void readFully(InputStream in, byte[] buffer) throws IOException {
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int offset = 0;
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for (;;) {
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int read = in.read(buffer, offset, buffer.length - offset);
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if (read + offset < buffer.length) offset += read;
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else return;
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}
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}
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public static void copy(InputStream in, OutputStream out) throws IOException {
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byte[] buffer = new byte[4096];
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int read;
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while ((read = in.read(buffer)) != -1) {
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out.write(buffer, 0, read);
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}
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in.close();
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out.close();
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}
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}
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