FreeTDS Development Group

[M C <mcbp223 AT yahoo.com>]

> > > I am playing with Query Analizer as a server emulator.
> > For blobs, it will accept arbitrary lengths for textptr, less 
> > than 256 of coarse (my tests were with the MS odbc driver and 
> > oledb provider so far).
> > Would you please check the hardcoding in token.cpp,  function 
> > tds_get_data(), by the line
> >     if (len == 16) { /*  Jeff's hack */
> >         tds_get_n(tds, blob_info->textptr, 16);
> > 
> > and see if you can afford a dynamic size for that?
> > I'm not sure if you want to go for the allocation overhead 
> > though, but some strategy with optimization for len <= 16 might work.
> > Thanks,
> > MC
> >  
> 
> ??? how did you send length for textptr ???
> textptr is not the content of text...
> 
> freddy77

The byte preceeding textptr in the blob is it's length. It is gotten in 
tds_get_data(),
        switch (curcol->column_varint_size) {
        case 4:  /* Its a BLOB... */
---->           len = tds_get_byte(tds);
                blob_info = (TDSBLOBINFO *) & 
(current_row[curcol->column_offset]);
---->           if (len == 16) { /*  Jeff's hack */
                        tds_get_n(tds, blob_info->textptr, 16);
                        tds_get_n(tds, blob_info->timestamp, 8);

But tested only against 16 in the if (len == 16).

I take it that textptr works like a bookmark, the server can send anything 
and the client will send back the same thing when asking for a chunk.

MC



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