P3

  1 package p3.hadoop.mapred;
  2 
  3 import java.io.IOException;
  4 import java.io.InputStream;
  5 import org.apache.hadoop.conf.Configuration;
  6 import org.apache.hadoop.io.BytesWritable;
  7 import p3.common.lib.BinaryUtils;
  8 import p3.common.lib.Bytes;
  9 
 10 public class PcapLineReader
 11 {
 12   private static final int DEFAULT_BUFFER_SIZE = 2048;
 13   private int bufferSize;
 14   private static final int PCAP_FILE_HEADER_LENGTH = 24;
 15   private static final int PCAP_PACKET_HEADER_LENGTH = 16;
 16   private static final int PCAP_PACKET_HEADER_CAPLEN_POS = 8;
 17   private static final int PCAP_PACKET_HEADER_WIREDLEN_POS = 12;
 18   private static final int PCAP_PACKET_HEADER_CAPLEN_LEN = 4;
 19   private static final int PCAP_PACKET_HEADER_TIMESTAMP_LEN = 4;
 20   private static final int PCAP_PACKET_MIN_LEN = 53;
 21   private static final int PCAP_PACKET_MAX_LEN = 1519;
 22   private static final int MAGIC_NUMBER = -725372255;
 23   private static final int MIN_PKT_SIZE = 42;
 24   private long min_captime;
 25   private long max_captime;
 26   private InputStream in;
 27   private byte[] buffer;
 28   byte[] pcap_header;
 29   private int bufferLength;
 30   int consumed;
 31 
 32   public PcapLineReader(InputStream in, int bufferSize, long min_captime, long max_captime)
 33   {
 34     this.bufferSize = 2048;
 35 
 36     this.bufferLength = 0;
 37     this.consumed = 0;
 38 
 39     this.in = in;
 40     this.bufferSize = bufferSize;
 41     this.buffer = new byte[this.bufferSize];
 42     this.min_captime = min_captime;
 43     this.max_captime = max_captime;
 44   }
 45 
 46   public PcapLineReader(InputStream in, Configuration conf)
 47     throws IOException
 48   {
 49     this(in, 2048, 
 50       conf.getLong("pcap.file.captime.min", 1309412600L), 
 51       conf.getLong("pcap.file.captime.max", conf.getLong("pcap.file.captime.max", 1309412600L) + 172800L));
 52   }
 53 
 54   public void close()
 55     throws IOException
 56   {
 57     this.in.close();
 58   }
 59 
 60   int skipPartialRecord(int fraction)
 61     throws IOException
 62   {
 63     int pos = 0;
 64     byte[] captured = new byte[fraction];
 65     byte[] tmpTimestamp1 = new byte[4];
 66     byte[] tmpTimestamp2 = new byte[4];
 67     byte[] tmpCapturedLen1 = new byte[4];
 68     byte[] tmpWiredLen1 = new byte[4];
 69     byte[] tmpCapturedLen2 = new byte[4];
 70     byte[] tmpWiredLen2 = new byte[4];
 71     int caplen1 = 0;
 72     int wiredlen1 = 0;
 73     int caplen2 = 0;
 74     int wiredlen2 = 0;
 75     long timestamp2 = 0L;
 76 
 77     int size = 0;
 78     long endureTime = 100L;
 79 
 80     if ((size = this.in.read(captured)) < 42) return 0;
 81 
 82     do
 83     {
 84       if ((size - pos < 32) || (size - pos < 53)) {
 85         pos = size;
 86         break;
 87       }
 88 
 89       System.arraycopy(captured, pos, tmpTimestamp1, 0, 4);
 90       long timestamp1 = Bytes.toLong(BinaryUtils.flipBO(tmpTimestamp1, 4));
 91 
 92       System.arraycopy(captured, pos + 8, tmpCapturedLen1, 0, 4);
 93       caplen1 = Bytes.toInt(BinaryUtils.flipBO(tmpCapturedLen1, 4));
 94 
 95       System.arraycopy(captured, pos + 12, tmpWiredLen1, 0, 4);
 96       wiredlen1 = Bytes.toInt(BinaryUtils.flipBO(tmpWiredLen1, 4));
 97 
 98       if ((caplen1 > 53) && (caplen1 < 1519) && (size - pos - 32 - caplen1 > 0))
 99       {
100         System.arraycopy(captured, pos + 16 + caplen1 + 8, tmpCapturedLen2, 0, 4);
101         caplen2 = Bytes.toInt(BinaryUtils.flipBO(tmpCapturedLen2, 4));
102 
103         System.arraycopy(captured, pos + 16 + caplen1 + 12, tmpWiredLen2, 0, 4);
104         wiredlen2 = Bytes.toInt(BinaryUtils.flipBO(tmpWiredLen2, 4));
105 
106         System.arraycopy(captured, pos + 16 + caplen1, tmpTimestamp2, 0, 4);
107         timestamp2 = Bytes.toLong(BinaryUtils.flipBO(tmpTimestamp2, 4));
108 
109         if ((timestamp1 >= this.min_captime) && (timestamp1 < this.max_captime) && (this.min_captime <= timestamp2) && (timestamp2 < this.max_captime) && 
110           (wiredlen1 > 53) && (wiredlen1 < 1519) && (wiredlen2 > 53) && (wiredlen2 < 1519) && 
111           (caplen1 > 0) && (caplen1 <= wiredlen1) && (caplen2 > 0) && (caplen2 <= wiredlen2) && 
112           (timestamp2 >= timestamp1) && (timestamp2 - timestamp1 < endureTime)) {
113           return pos;
114         }
115 
116       }
117 
118       ++pos;
119     }
120     while (pos < size);
121 
122     return pos;
123   }
124 
125   int readPacket(int packetLen)
126     throws IOException
127   {
128     int bufferPosn = 16;
129     byte[] tmp_buffer = new byte[packetLen];
130 
131     if ((this.bufferLength = this.in.read(tmp_buffer)) < packetLen) {
132       System.arraycopy(tmp_buffer, 0, this.buffer, bufferPosn, this.bufferLength);
133       bufferPosn += this.bufferLength;
134 
135       byte[] newpacket = new byte[packetLen - this.bufferLength];
136 
137       if ((this.bufferLength = this.in.read(newpacket)) < 0) return bufferPosn;
138       System.arraycopy(newpacket, 0, this.buffer, bufferPosn, this.bufferLength);
139     }
140     else
141     {
142       System.arraycopy(tmp_buffer, 0, this.buffer, bufferPosn, this.bufferLength);
143     }
144     bufferPosn += this.bufferLength;
145 
146     return bufferPosn;
147   }
148 
149   int readPacketHeader()
150   {
151     int headerLength = 0;
152     int headerPosn = 0;
153     this.pcap_header = new byte[16];
154 
155     byte[] tmp_header = new byte[16];
156     BytesWritable capturedLen = new BytesWritable();
157     try
158     {
159       if ((headerLength = this.in.read(this.pcap_header)) < 16)
160       {
161         if (headerLength == -1) return 0;
162         headerPosn += headerLength;
163 
164         byte[] newheader = new byte[16 - headerLength];
165 
166         if ((headerLength = this.in.read(newheader)) < 0) {
167           this.consumed = headerPosn;
168           return -1;
169         }
170         System.arraycopy(newheader, 0, this.pcap_header, headerPosn, headerLength);
171       }
172       capturedLen.set(this.pcap_header, 8, 4);
173       System.arraycopy(this.pcap_header, 0, this.buffer, 0, 16);
174       headerPosn = 0;
175     }
176     catch (IOException e)
177     {
178       e.printStackTrace();
179     }
180     return Bytes.toInt(BinaryUtils.flipBO(capturedLen.getBytes(), 4));
181   }
182 
183   public int readFileHeader()
184   {
185     try {
186       byte[] magic = new byte[4];
187       this.bufferLength = this.in.read(this.buffer, 0, 24);
188       System.arraycopy(this.buffer, 0, magic, 0, magic.length);
189 
190       if (Bytes.toInt(magic) == -725372255) break label50;
191       return 0;
192     }
193     catch (IOException e) {
194       e.printStackTrace();
195     }
196     label50: return this.bufferLength;
197   }
198 
199   public int readLine(BytesWritable bytes, int maxLineLength, int maxBytesToConsume)
200     throws IOException
201   {
202     bytes.set(new BytesWritable());
203     boolean hitEndOfFile = false;
204     long bytesConsumed = 0L;
205 
206     int caplen = readPacketHeader();
207 
208     if (caplen == 0) {
209       bytesConsumed = 0L;
210     } else if (caplen == -1) {
211       bytesConsumed += this.consumed;
212     }
213     else if ((caplen > 0) && (caplen < 1519)) {
214       if ((this.bufferLength = readPacket(caplen)) < caplen + 16) {
215         hitEndOfFile = true;
216       }
217       bytesConsumed += this.bufferLength;
218 
219       if (!(hitEndOfFile)) {
220         bytes.set(this.buffer, 0, caplen + 16);
221       }
222     }
223 
224     return (int)Math.min(bytesConsumed, 2147483647L);
225   }
226 
227   public int readLine(BytesWritable str, int maxLineLength)
228     throws IOException
229   {
230     return readLine(str, maxLineLength, 2147483647);
231   }
232 
233   public int readLine(BytesWritable str)
234     throws IOException
235   {
236     return readLine(str, 2147483647, 2147483647);
237   }
238 }
View Code
// Decompiled by Jad v1.5.8e2. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://kpdus.tripod.com/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi space 
// Source File Name:   PcapVlenRecordReader.java

package p3.hadoop.mapred;

import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.*;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.compress.CompressionCodec;
import org.apache.hadoop.io.compress.CompressionCodecFactory;
import org.apache.hadoop.mapred.FileSplit;
import org.apache.hadoop.mapred.RecordReader;

// Referenced classes of package p3.hadoop.mapred:
//			PcapLineReader

public class PcapVlenRecordReader
	implements RecordReader
{

	private CompressionCodecFactory compressionCodecs;
	private long start;
	private long pos;
	private long end;
	private PcapLineReader in;
	int maxLineLength;
	private boolean fileheader_skip;

	public PcapVlenRecordReader(Configuration job, FileSplit split)
		throws IOException
	{
		compressionCodecs = null;
		fileheader_skip = true;
		maxLineLength = job.getInt("mapred.linerecordreader.maxlength", 0x7fffffff);
		fileheader_skip = job.getBoolean("pcap.file.header.skip", true);
		start = split.getStart();
		end = start + split.getLength();
		Path file = split.getPath();
		compressionCodecs = new CompressionCodecFactory(job);
		CompressionCodec codec = compressionCodecs.getCodec(file);
		FileSystem fs = file.getFileSystem(job);
		FSDataInputStream fileIn = fs.open(split.getPath());
		boolean skipFileHeader = false;
		boolean skipPartialRecord = false;
		int fraction = 4000;
		if (codec != null)
		{
			in = new PcapLineReader(codec.createInputStream(fileIn), job);
			end = 0x7fffffffffffffffL;
			skipFileHeader = true;
		} else
		{
			if (start == 0L)
			{
				skipFileHeader = true;
			} else
			{
				skipPartialRecord = true;
				fileIn.seek(start);
			}
			in = new PcapLineReader(fileIn, job);
		}
		if (skipFileHeader)
			start += in.readFileHeader();
		if (skipPartialRecord)
		{
			int skip;
			for (skip = in.skipPartialRecord(fraction); skip == fraction; skip = in.skipPartialRecord(fraction))
				start += skip;

			start += skip;
			fileIn.seek(start);
			in = new PcapLineReader(fileIn, job);
		}
		pos = start;
	}

	public LongWritable createKey()
	{
		return new LongWritable();
	}

	public BytesWritable createValue()
	{
		return new BytesWritable();
	}

	public synchronized boolean next(LongWritable key, BytesWritable value)
		throws IOException
	{
		while (pos < end) 
		{
			key.set(pos);
			int newSize = in.readLine(value, maxLineLength, Math.max((int)Math.min(0x7fffffffL, end - pos), maxLineLength));
			if (newSize == 0)
			{
				pos = end;
				return false;
			}
			pos += newSize;
			if (newSize < maxLineLength)
				return true;
		}
		return false;
	}

	public float getProgress()
	{
		if (start == end)
			return 0.0F;
		else
			return Math.min(1.0F, (float)(pos - start) / (float)(end - start));
	}

	public synchronized long getPos()
		throws IOException
	{
		return pos;
	}

	public synchronized void close()
		throws IOException
	{
		if (in != null)
			in.close();
	}

	public volatile boolean next(Object obj, Object obj1)
		throws IOException
	{
		return next((LongWritable)obj, (BytesWritable)obj1);
	}

	public volatile Object createValue()
	{
		return createValue();
	}

	public volatile Object createKey()
	{
		return createKey();
	}
}

　　

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原文地址：https://www.cnblogs.com/kxdblog/p/4233101.html