| /** |
| * 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.hadoop.hdfs; |
| |
| import java.io.IOException; |
| |
| /** |
| * For sharing between the local and remote block reader implementations. |
| */ |
| class BlockReaderUtil { |
| |
| /* See {@link BlockReader#readAll(byte[], int, int)} */ |
| public static int readAll(BlockReader reader, |
| byte[] buf, int offset, int len) throws IOException { |
| int n = 0; |
| for (;;) { |
| int nread = reader.read(buf, offset + n, len - n); |
| if (nread <= 0) |
| return (n == 0) ? nread : n; |
| n += nread; |
| if (n >= len) |
| return n; |
| } |
| } |
| |
| /* See {@link BlockReader#readFully(byte[], int, int)} */ |
| public static void readFully(BlockReader reader, |
| byte[] buf, int off, int len) throws IOException { |
| int toRead = len; |
| while (toRead > 0) { |
| int ret = reader.read(buf, off, toRead); |
| if (ret < 0) { |
| throw new IOException("Premature EOF from inputStream"); |
| } |
| toRead -= ret; |
| off += ret; |
| } |
| } |
| } |