/* | |
* Copyright 2004,2005 The Apache Software Foundation. | |
* | |
* Licensed 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.ws.commons.attachments.utils; | |
import java.io.IOException; | |
import java.io.InputStream; | |
/** | |
* Utility class containing IO helper methods | |
*/ | |
public class IOUtils { | |
private IOUtils() { | |
} | |
/** | |
* Reads into a byte array. Ensures that the full buffer is read. | |
* Helper method, just calls <tt>readFully(in, b, 0, b.length)</tt> | |
* | |
* @see #readFully(java.io.InputStream, byte[], int, int) | |
*/ | |
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. | |
* | |
* @return Returns the number of bytes read, or -1 if the end of file is | |
* reached before any bytes are 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; | |
} | |
} | |
} | |
} |