| /* |
| * 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.io.compress.bzip2; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| |
| import static org.apache.hadoop.io.compress.SplittableCompressionCodec.READ_MODE.BYBLOCK; |
| |
| public final class BZip2Utils { |
| |
| private BZip2Utils() { |
| } |
| |
| /** |
| * Returns the start offsets of blocks that follow the first block in the |
| * BZip2 compressed file at the given path. The first offset corresponds to |
| * the first byte containing the BZip2 block marker of the second block. The |
| * i-th offset corresponds to the block marker of the (i + 1)-th block. |
| */ |
| public static List<Long> getNextBlockMarkerOffsets( |
| Path path, Configuration conf) throws IOException { |
| FileSystem fs = path.getFileSystem(conf); |
| try (InputStream fileIn = fs.open(path)) { |
| return getNextBlockMarkerOffsets(fileIn); |
| } |
| } |
| |
| /** |
| * Returns the start offsets of blocks that follow the first block in the |
| * BZip2 compressed input stream. The first offset corresponds to |
| * the first byte containing the BZip2 block marker of the second block. The |
| * i-th offset corresponds to the block marker of the (i + 1)-th block. |
| */ |
| public static List<Long> getNextBlockMarkerOffsets(InputStream rawIn) |
| throws IOException { |
| try (CBZip2InputStream in = new CBZip2InputStream(rawIn, BYBLOCK)) { |
| ArrayList<Long> offsets = new ArrayList<>(); |
| while (in.skipToNextBlockMarker()) { |
| offsets.add(in.getProcessedByteCount()); |
| } |
| return offsets; |
| } |
| } |
| } |