On 24/10/2014 21:48, Mark Thomas wrote:
> On 24/10/2014 21:22, Konstantin Kolinko wrote:
>> 2014-10-24 23:48 GMT+04:00  <ma...@apache.org>:
>>> Author: markt
>>> Date: Fri Oct 24 19:48:18 2014
>>> New Revision: 1634125
>>>
>>> URL: http://svn.apache.org/r1634125
>>> Log:
>>> Fix double counting of written characters.
>>>
>>> Modified:
>>>     tomcat/trunk/java/org/apache/catalina/connector/OutputBuffer.java
>>>
>>> Modified: tomcat/trunk/java/org/apache/catalina/connector/OutputBuffer.java
>>> URL: 
>>> http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/catalina/connector/OutputBuffer.java?rev=1634125&r1=1634124&r2=1634125&view=diff
>>> ==============================================================================
>>> --- tomcat/trunk/java/org/apache/catalina/connector/OutputBuffer.java 
>>> (original)
>>> +++ tomcat/trunk/java/org/apache/catalina/connector/OutputBuffer.java Fri 
>>> Oct 24 19:48:18 2014
>>> @@ -523,7 +523,6 @@ public class OutputBuffer extends Writer
>>>              return;
>>>          }
>>>
>>> -        charsWritten += len;
>>>          if (s == null) {
>>>              s = "null";
>>>          }
>>
>> The context of the above change is
>>
>>   @Override
>>   public void write(String s, int off, int len)
>>         throws IOException {
>>
>>         if (suspended) {
>>             return;
>>         }
>>
>>         if (s == null) {
>>             s = "null";
>>         }
>>         cb.append(s, off, len);
>>         charsWritten += len;
>>     }
>>
>> The null value handling there is rather odd. It writes len character
>> from string "null". It makes no sense. (Whose offset and whose length
>> are those?)
> 
> Indeed. Worth looking at the history and the specs though first in case
> there is a good reason for this.

It dates back to Tomcat 3.3.x, possibly earlier but I don't know my way
around the code well enough that far back to trace it easily.

>> java.io.Writer implements the same method so that it blows with an
>> NPE. I think our implementation shall throw NPE as well.

Works for me.

Mark


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