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From "Samuel Andrew McIntyre (JIRA)" <derby-...@db.apache.org>
Subject [jira] Closed: (DERBY-121) Network Server reading blob/clob data size
Date Sat, 04 Jun 2005 07:33:41 GMT
     [ http://issues.apache.org/jira/browse/DERBY-121?page=all ]
     
Samuel Andrew McIntyre closed DERBY-121:
----------------------------------------

    Resolution: Fixed

Patch was committed with svn revision 179859. Closing.

> Network Server reading blob/clob data size
> ------------------------------------------
>
>          Key: DERBY-121
>          URL: http://issues.apache.org/jira/browse/DERBY-121
>      Project: Derby
>         Type: Bug
>   Components: Network Server
>     Versions: 10.1.0.0
>  Environment: The is a bit shift typo in Network Server reading clob/blob data size
>     Reporter: Lynh Nguyen
>     Assignee: A B
>     Priority: Minor
>      Fix For: 10.1.0.0
>  Attachments: derby-121_2.stat, derby-121_3.patch
>
> in DDMReader.java 
> ...
> ... readLengthAndCodePoint() ... { 
> ...
> switch (numberOfExtendedLenBytes) {
> 			case 8:
> 				 ddmScalarLen =
> 					((buffer[pos++] & 0xff) << 64) +
> 					((buffer[pos++] & 0xff) << 56) +
> 					((buffer[pos++] & 0xff) << 48) +
> 					((buffer[pos++] & 0xff) << 40) +
> 					((buffer[pos++] & 0xff) << 32) +
> 					((buffer[pos++] & 0xff) << 16) +
> 					((buffer[pos++] & 0xff) << 8) +
> 					((buffer[pos++] & 0xff) << 0);
> 				adjustSize = 12;
> 				break;
> 			case 6:
> 				ddmScalarLen =
> 					((buffer[pos++] & 0xff) << 48) +
> 					((buffer[pos++] & 0xff) << 40) +
> 					((buffer[pos++] & 0xff) << 32) +
> 					((buffer[pos++] & 0xff) << 16) +
> 					((buffer[pos++] & 0xff) << 8) +
> 					((buffer[pos++] & 0xff) << 0);
> 				adjustSize = 10;
> 				break;
> 			case 4:
> 				ddmScalarLen =
> 					((buffer[pos++] & 0xff) << 32) +
> 					((buffer[pos++] & 0xff) << 16) +
> 					((buffer[pos++] & 0xff) << 8) +
> 					((buffer[pos++] & 0xff) << 0);
> 				adjustSize = 8;
> 				break;
> ...
> The shift bits should be in order:
> 0,8,16,24 
> 0,8,16,24,32,40
> 0,8,16,24,32,40,48,56
> This will only affect a lob if its length requires at least 24 bits--i.e. if the lob
has a length of at least 2^24 bytes.

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