| |
| /* ==================================================================== |
| Licensed to the Apache Software Foundation (ASF) under one or more |
| contributor license agreements. See the NOTICE file distributed with |
| this work for additional information regarding copyright ownership. |
| The ASF licenses this file to You 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 org.apache.poi.util; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| public class IOUtils |
| { |
| private IOUtils() |
| { |
| } |
| |
| /** |
| * Reads all the data from the input stream, and returns |
| * the bytes read. |
| */ |
| public static byte[] toByteArray(InputStream stream) throws IOException { |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| |
| byte[] buffer = new byte[4096]; |
| int read = 0; |
| while(read != -1) { |
| read = stream.read(buffer); |
| if(read > 0) { |
| baos.write(buffer, 0, read); |
| } |
| } |
| |
| return baos.toByteArray(); |
| } |
| |
| /** |
| * Helper method, just calls <tt>readFully(in, b, 0, b.length)</tt> |
| */ |
| public static int readFully(InputStream in, byte[] b) |
| throws IOException |
| { |
| return readFully(in, b, 0, b.length); |
| } |
| |
| /** |
| * Same as the normal <tt>in.read(b, off, len)</tt>, but |
| * tries to ensure that the entire len number of bytes |
| * is read. |
| * <p> |
| * If the end of file is reached before any bytes |
| * are read, returns -1. |
| * If the end of the file is reached after some bytes are |
| * read, returns the number of bytes read. |
| * If the end of the file isn't reached before len |
| * bytes have been read, will return len bytes. |
| */ |
| public static int readFully(InputStream in, byte[] b, int off, int len) |
| throws IOException |
| { |
| int total = 0; |
| for (;;) { |
| int got = in.read(b, off + total, len - total); |
| if (got < 0) { |
| return (total == 0) ? -1 : total; |
| } else { |
| total += got; |
| if (total == len) |
| return total; |
| } |
| } |
| } |
| } |