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From d...@apache.org
Subject svn commit: r809491 - in /hadoop/common/trunk: CHANGES.txt src/java/org/apache/hadoop/io/DataOutputBuffer.java src/java/org/apache/hadoop/io/Text.java
Date Mon, 31 Aug 2009 07:56:39 GMT
Author: ddas
Date: Mon Aug 31 07:56:39 2009
New Revision: 809491

URL: http://svn.apache.org/viewvc?rev=809491&view=rev
Log:
HADOOP-6224. Adds methods to read strings safely, makes the Buffer class in DataOutputBuffer
public, and introduces public constructors there. These changes are required for MAPREDUCE-318.
Contributed by Jothi Padmanabhan and Arun Murthy.

Modified:
    hadoop/common/trunk/CHANGES.txt
    hadoop/common/trunk/src/java/org/apache/hadoop/io/DataOutputBuffer.java
    hadoop/common/trunk/src/java/org/apache/hadoop/io/Text.java

Modified: hadoop/common/trunk/CHANGES.txt
URL: http://svn.apache.org/viewvc/hadoop/common/trunk/CHANGES.txt?rev=809491&r1=809490&r2=809491&view=diff
==============================================================================
--- hadoop/common/trunk/CHANGES.txt (original)
+++ hadoop/common/trunk/CHANGES.txt Mon Aug 31 07:56:39 2009
@@ -507,6 +507,10 @@
 
     HADOOP-6184. Provide an API to dump Configuration in a JSON format.
     (V.V.Chaitanya Krishna via yhemanth)
+
+    HADOOP-6224. Adds methods to read strings safely, makes the Buffer class
+    in DataOutputBuffer public, and introduces public constructors there. These changes
+    are required for MAPREDUCE-318. (Jothi Padmanabhan and Arun Murthy via ddas)
  
   OPTIMIZATIONS
 

Modified: hadoop/common/trunk/src/java/org/apache/hadoop/io/DataOutputBuffer.java
URL: http://svn.apache.org/viewvc/hadoop/common/trunk/src/java/org/apache/hadoop/io/DataOutputBuffer.java?rev=809491&r1=809490&r2=809491&view=diff
==============================================================================
--- hadoop/common/trunk/src/java/org/apache/hadoop/io/DataOutputBuffer.java (original)
+++ hadoop/common/trunk/src/java/org/apache/hadoop/io/DataOutputBuffer.java Mon Aug 31 07:56:39
2009
@@ -20,6 +20,8 @@
 
 import java.io.*;
 
+import org.apache.hadoop.io.DataOutputBuffer.Buffer;
+
 /** A reusable {@link DataOutput} implementation that writes to an in-memory
  * buffer.
  *
@@ -41,7 +43,7 @@
  */
 public class DataOutputBuffer extends DataOutputStream {
 
-  private static class Buffer extends ByteArrayOutputStream {
+  public static class Buffer extends ByteArrayOutputStream {
     public byte[] getData() { return buf; }
     public int getLength() { return count; }
 
@@ -53,6 +55,10 @@
       super(size);
     }
     
+    public Buffer(byte[] buf) {
+      super.buf = buf;
+    }
+
     public void write(DataInput in, int len) throws IOException {
       int newcount = count + len;
       if (newcount > buf.length) {
@@ -76,6 +82,10 @@
     this(new Buffer(size));
   }
   
+  public DataOutputBuffer(byte[] buf) {
+    this(new Buffer(buf));
+  }
+
   private DataOutputBuffer(Buffer buffer) {
     super(buffer);
     this.buffer = buffer;

Modified: hadoop/common/trunk/src/java/org/apache/hadoop/io/Text.java
URL: http://svn.apache.org/viewvc/hadoop/common/trunk/src/java/org/apache/hadoop/io/Text.java?rev=809491&r1=809490&r2=809491&view=diff
==============================================================================
--- hadoop/common/trunk/src/java/org/apache/hadoop/io/Text.java (original)
+++ hadoop/common/trunk/src/java/org/apache/hadoop/io/Text.java Mon Aug 31 07:56:39 2009
@@ -35,6 +35,7 @@
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.io.WritableUtils;
 
 /** This class stores text using standard UTF8 encoding.  It provides methods
  * to serialize, deserialize, and compare texts at byte level.  The type of
@@ -403,6 +404,30 @@
     in.readFully(bytes, 0, length);
     return decode(bytes);
   }
+  /**
+   * Read a string, but check it for sanity. The format consists of a vint
+   * followed by the given number of bytes.
+   * @param in the stream to read from
+   * @param maxLength the largest acceptable length of string
+   * @return the bytes as a string
+   * @throws IOException if reading from the DataInput fails
+   * @throws IllegalArgumentException if the string length is negative or 
+   *         larger than maxSize. Only the vint is read.
+   */
+  public static String readStringSafely(DataInput in,
+                                        int maxLength
+                                        ) throws IOException, 
+                                                 IllegalArgumentException {
+    int length = WritableUtils.readVInt(in);
+    if (length < 0 || length > maxLength) {
+      throw new IllegalArgumentException("String size was " + length + 
+                                         ", which is outside of 0.." +
+                                         maxLength);
+    }
+    byte [] bytes = new byte[length];
+    in.readFully(bytes, 0, length);
+    return decode(bytes);
+  }
 
   /** Write a UTF8 encoded string to out
    */



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