[120] | 1 | /** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 3 | * or more contributor license agreements. See the NOTICE file |
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| 4 | * distributed with this work for additional information |
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| 5 | * regarding copyright ownership. The ASF licenses this file |
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| 6 | * to you under the Apache License, Version 2.0 (the |
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| 7 | * "License"); you may not use this file except in compliance |
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| 8 | * with the License. You may obtain a copy of the License at |
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| 9 | * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 11 | * |
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| 12 | * Unless required by applicable law or agreed to in writing, software |
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| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 15 | * See the License for the specific language governing permissions and |
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| 16 | * limitations under the License. |
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| 17 | */ |
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| 18 | package org.apache.hadoop.fs; |
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| 19 | |
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| 20 | import java.io.DataInput; |
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| 21 | import java.io.DataOutput; |
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| 22 | import java.io.IOException; |
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| 23 | |
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| 24 | import org.apache.hadoop.io.MD5Hash; |
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| 25 | import org.apache.hadoop.io.WritableUtils; |
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| 26 | import org.xml.sax.Attributes; |
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| 27 | import org.xml.sax.SAXException; |
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| 28 | import org.znerd.xmlenc.XMLOutputter; |
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| 29 | |
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| 30 | /** MD5 of MD5 of CRC32. */ |
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| 31 | public class MD5MD5CRC32FileChecksum extends FileChecksum { |
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| 32 | public static final int LENGTH = MD5Hash.MD5_LEN |
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| 33 | + (Integer.SIZE + Long.SIZE)/Byte.SIZE; |
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| 34 | |
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| 35 | private int bytesPerCRC; |
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| 36 | private long crcPerBlock; |
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| 37 | private MD5Hash md5; |
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| 38 | |
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| 39 | /** Same as this(0, 0, null) */ |
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| 40 | public MD5MD5CRC32FileChecksum() { |
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| 41 | this(0, 0, null); |
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| 42 | } |
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| 43 | |
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| 44 | /** Create a MD5FileChecksum */ |
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| 45 | public MD5MD5CRC32FileChecksum(int bytesPerCRC, long crcPerBlock, MD5Hash md5) { |
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| 46 | this.bytesPerCRC = bytesPerCRC; |
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| 47 | this.crcPerBlock = crcPerBlock; |
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| 48 | this.md5 = md5; |
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| 49 | } |
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| 50 | |
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| 51 | /** {@inheritDoc} */ |
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| 52 | public String getAlgorithmName() { |
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| 53 | return "MD5-of-" + crcPerBlock + "MD5-of-" + bytesPerCRC + "CRC32"; |
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| 54 | } |
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| 55 | |
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| 56 | /** {@inheritDoc} */ |
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| 57 | public int getLength() {return LENGTH;} |
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| 58 | |
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| 59 | /** {@inheritDoc} */ |
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| 60 | public byte[] getBytes() { |
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| 61 | return WritableUtils.toByteArray(this); |
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| 62 | } |
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| 63 | |
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| 64 | /** {@inheritDoc} */ |
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| 65 | public void readFields(DataInput in) throws IOException { |
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| 66 | bytesPerCRC = in.readInt(); |
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| 67 | crcPerBlock = in.readLong(); |
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| 68 | md5 = MD5Hash.read(in); |
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| 69 | } |
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| 70 | |
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| 71 | /** {@inheritDoc} */ |
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| 72 | public void write(DataOutput out) throws IOException { |
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| 73 | out.writeInt(bytesPerCRC); |
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| 74 | out.writeLong(crcPerBlock); |
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| 75 | md5.write(out); |
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| 76 | } |
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| 77 | |
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| 78 | /** Write that object to xml output. */ |
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| 79 | public static void write(XMLOutputter xml, MD5MD5CRC32FileChecksum that |
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| 80 | ) throws IOException { |
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| 81 | xml.startTag(MD5MD5CRC32FileChecksum.class.getName()); |
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| 82 | if (that != null) { |
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| 83 | xml.attribute("bytesPerCRC", "" + that.bytesPerCRC); |
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| 84 | xml.attribute("crcPerBlock", "" + that.crcPerBlock); |
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| 85 | xml.attribute("md5", "" + that.md5); |
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| 86 | } |
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| 87 | xml.endTag(); |
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| 88 | } |
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| 89 | |
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| 90 | /** Return the object represented in the attributes. */ |
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| 91 | public static MD5MD5CRC32FileChecksum valueOf(Attributes attrs |
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| 92 | ) throws SAXException { |
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| 93 | final String bytesPerCRC = attrs.getValue("bytesPerCRC"); |
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| 94 | final String crcPerBlock = attrs.getValue("crcPerBlock"); |
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| 95 | final String md5 = attrs.getValue("md5"); |
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| 96 | if (bytesPerCRC == null || crcPerBlock == null || md5 == null) { |
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| 97 | return null; |
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| 98 | } |
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| 99 | |
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| 100 | try { |
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| 101 | return new MD5MD5CRC32FileChecksum(Integer.valueOf(bytesPerCRC), |
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| 102 | Integer.valueOf(crcPerBlock), new MD5Hash(md5)); |
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| 103 | } catch(Exception e) { |
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| 104 | throw new SAXException("Invalid attributes: bytesPerCRC=" + bytesPerCRC |
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| 105 | + ", crcPerBlock=" + crcPerBlock + ", md5=" + md5, e); |
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| 106 | } |
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| 107 | } |
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| 108 | |
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| 109 | /** {@inheritDoc} */ |
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| 110 | public String toString() { |
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| 111 | return getAlgorithmName() + ":" + md5; |
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| 112 | } |
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| 113 | } |
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