81 lines
3.0 KiB
Java
81 lines
3.0 KiB
Java
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/*
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* Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* IOUtils: A collection of IO-related public static methods.
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*/
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package sun.misc;
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import java.io.EOFException;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.Arrays;
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public class IOUtils {
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/**
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* Read up to <code>length</code> of bytes from <code>in</code>
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* until EOF is detected.
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* @param in input stream, must not be null
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* @param length number of bytes to read, -1 or Integer.MAX_VALUE means
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* read as much as possible
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* @param readAll if true, an EOFException will be thrown if not enough
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* bytes are read. Ignored when length is -1 or Integer.MAX_VALUE
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* @return bytes read
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* @throws IOException Any IO error or a premature EOF is detected
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*/
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public static byte[] readFully(InputStream is, int length, boolean readAll)
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throws IOException {
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byte[] output = {};
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if (length == -1) length = Integer.MAX_VALUE;
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int pos = 0;
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while (pos < length) {
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int bytesToRead;
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if (pos >= output.length) { // Only expand when there's no room
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bytesToRead = Math.min(length - pos, output.length + 1024);
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if (output.length < pos + bytesToRead) {
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output = Arrays.copyOf(output, pos + bytesToRead);
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}
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} else {
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bytesToRead = output.length - pos;
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}
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int cc = is.read(output, pos, bytesToRead);
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if (cc < 0) {
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if (readAll && length != Integer.MAX_VALUE) {
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throw new EOFException("Detect premature EOF");
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} else {
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if (output.length != pos) {
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output = Arrays.copyOf(output, pos);
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}
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break;
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}
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}
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pos += cc;
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}
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return output;
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}
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}
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