| /** |
| * 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.util; |
| |
| import java.io.DataInput; |
| import java.io.IOException; |
| |
| public abstract class ProtoUtil { |
| |
| /** |
| * Read a variable length integer in the same format that ProtoBufs encodes. |
| * @param in the input stream to read from |
| * @return the integer |
| * @throws IOException if it is malformed or EOF. |
| */ |
| public static int readRawVarint32(DataInput in) throws IOException { |
| byte tmp = in.readByte(); |
| if (tmp >= 0) { |
| return tmp; |
| } |
| int result = tmp & 0x7f; |
| if ((tmp = in.readByte()) >= 0) { |
| result |= tmp << 7; |
| } else { |
| result |= (tmp & 0x7f) << 7; |
| if ((tmp = in.readByte()) >= 0) { |
| result |= tmp << 14; |
| } else { |
| result |= (tmp & 0x7f) << 14; |
| if ((tmp = in.readByte()) >= 0) { |
| result |= tmp << 21; |
| } else { |
| result |= (tmp & 0x7f) << 21; |
| result |= (tmp = in.readByte()) << 28; |
| if (tmp < 0) { |
| // Discard upper 32 bits. |
| for (int i = 0; i < 5; i++) { |
| if (in.readByte() >= 0) { |
| return result; |
| } |
| } |
| throw new IOException("Malformed varint"); |
| } |
| } |
| } |
| } |
| return result; |
| } |
| |
| } |
