100 lines
3.7 KiB
Java
100 lines
3.7 KiB
Java
|
|
/* ====================================================================
|
|
* The Apache Software License, Version 1.1
|
|
*
|
|
* Copyright (c) 2002 The Apache Software Foundation. All rights
|
|
* reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
*
|
|
* 3. The end-user documentation included with the redistribution,
|
|
* if any, must include the following acknowledgment:
|
|
* "This product includes software developed by the
|
|
* Apache Software Foundation (http://www.apache.org/)."
|
|
* Alternately, this acknowledgment may appear in the software itself,
|
|
* if and wherever such third-party acknowledgments normally appear.
|
|
*
|
|
* 4. The names "Apache" and "Apache Software Foundation" and
|
|
* "Apache POI" must not be used to endorse or promote products
|
|
* derived from this software without prior written permission. For
|
|
* written permission, please contact apache@apache.org.
|
|
*
|
|
* 5. Products derived from this software may not be called "Apache",
|
|
* "Apache POI", nor may "Apache" appear in their name, without
|
|
* prior written permission of the Apache Software Foundation.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
|
|
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
|
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
|
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
* ====================================================================
|
|
*
|
|
* This software consists of voluntary contributions made by many
|
|
* individuals on behalf of the Apache Software Foundation. For more
|
|
* information on the Apache Software Foundation, please see
|
|
* <http://www.apache.org/>.
|
|
*/
|
|
|
|
package org.apache.poi.util;
|
|
|
|
import java.io.IOException;
|
|
import java.io.InputStream;
|
|
|
|
public class IOUtils
|
|
{
|
|
private IOUtils()
|
|
{
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
* Otherwise, returns the number of bytes read.
|
|
*/
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|