From c3f7c1f3e55edfe723157896ba4e2d41b960aac8 Mon Sep 17 00:00:00 2001 From: Eli Collins Date: Tue, 13 Dec 2011 08:10:29 +0000 Subject: [PATCH] Add missing file to previous commit. git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1213593 13f79535-47bb-0310-9956-ffa450edef68 --- .../apache/hadoop/hdfs/BlockReaderUtil.java | 54 +++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/BlockReaderUtil.java diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/BlockReaderUtil.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/BlockReaderUtil.java new file mode 100644 index 0000000000..a9f5c85bca --- /dev/null +++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/BlockReaderUtil.java @@ -0,0 +1,54 @@ +/** + * 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; + } + } +} \ No newline at end of file