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From "Emmanuel Lecharny (JIRA)" <directory-...@incubator.apache.org>
Subject [jira] Updated: (DIR-105) Bad encoding of tags number above 127
Date Fri, 11 Feb 2005 00:25:12 GMT
     [ http://issues.apache.org/jira/browse/DIR-105?page=history ]

Emmanuel Lecharny updated DIR-105:
----------------------------------

    Attachment: Tag.diff
                TagTest.diff

Files that are to be modified :
.../directory/asn1/trunk/ber/src/java/org/apache/asn1/ber/Tag.java
.../directory/asn1/trunk/ber/src/test/org/apache/asn1/ber/TagTest.java

NB : Just launch the Junit Test ! I can't assure that this is bullet proof (my dev-env is
quit messy actually)...

> Bad encoding of tags number above 127
> -------------------------------------
>
>          Key: DIR-105
>          URL: http://issues.apache.org/jira/browse/DIR-105
>      Project: Directory
>         Type: Bug
>     Reporter: Emmanuel Lecharny
>     Assignee: Alex Karasulu
>     Priority: Minor
>  Attachments: Tag.diff, TagTest.diff
>
> Tere is a bug in functions :
> org.apache.asn1.ber.Tag.getTagId(byte[])
> and 
> org.apache.asn1.ber.Tag.getTagId(TagOctetCollector)
> when the tag has a number above 127 - which may be very unlikely to happen ! -. In this
case, bytes are decoded in the revert order :
>  ...
>         // calculate tag value w/ long tag format
>         for( int ii = 1 ; ii < octets.length; ii++ )
>         {
>             int shift = ( ii - 1 ) * 7 ;
>             id |= ( octets[ii] & LONG_MASK ) << shift ;
>         }
>  ...
> should be :
>  ...
>         // calculate tag value w/ long tag format
>         for ( int ii = 1; ii < octets.length; ii++ )
>         {
>             id = (id << 7) | (octets[ii] & LONG_MASK);
>         }
>  ...
> in both functions. 
> The test case should also be corrected, as value are create din the revert order in test

> org.apache.asn1.bertestGetTagIdByteArray() :
> ...
>             octets[1] = (byte)(ii & Tag.LONG_MASK);
>             octets[2] = (byte)((ii >> 7) & Tag.LONG_MASK);
> ...
> should be :
> ...
>             octets[1] = (byte)((ii >> 7) & Tag.LONG_MASK);
>             octets[2] = (byte)(ii & Tag.LONG_MASK);
> ...
> and
> ...
>             octets[1] = (byte)(ii & Tag.LONG_MASK);
>             octets[2] = (byte)((ii >> 7) & Tag.LONG_MASK);
>             octets[3] = (byte)((ii >> 14) & Tag.LONG_MASK);
> ...
> should be :
> ...
>             octets[1] = (byte)((ii >> 14) & Tag.LONG_MASK);
>             octets[2] = (byte)((ii >> 7) & Tag.LONG_MASK);
>             octets[3] = (byte)(ii & Tag.LONG_MASK);
> ...
> Function org.apache.asn1.ber.Tag.getTagId(int) seems to works correctly - although not
tested.

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