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BSD License For Conceal software Copyright (c) 2014, Facebook, Inc. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that...
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package com.facebook.crypto.streams; /* ww w . j a v a 2 s . co m*/ import java.io.ByteArrayOutputStream; import java.io.IOException; /** * A byte array stream which tries to avoid the double copy of * bytes when calling {@link java.io.ByteArrayOutputStream#toByteArray()}. * It enforces a particular size of bytes are written to it and throws * an exception if not. */ public class FixedSizeByteArrayOutputStream extends ByteArrayOutputStream { /** * @param size Size for the underlying byte array. You should pass in * the exact size of the array you need. */ public FixedSizeByteArrayOutputStream(int size) { super(size); } public byte[] getBytes() throws IOException { if (buf.length != count) { // This should not happen since we explicitly set the size // in such a way that the size will be perfect. throw new IOException("Size supplied is too small"); } return buf; } }