Network Server reading blob/clob data size

• Key: DERBY-121
• Type: Bug
• Status: Closed
• Resolution: Fixed
• Priority: Minor
• Assignee: A B
• Reporter: Lynh Nguyen
• Component/s: Network Server
• Affects Version/s: 10.1.1.0
• Fix Version/s: 10.1.1.0

Description

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.