[Pdx-pm] Big tied arrays

Marvin Humphrey marvin at rectangular.com
Mon Jun 13 15:51:03 PDT 2005

(whoops on that blank message...)

On Jun 13, 2005, at 12:47 PM, Michael G Schwern wrote:

>> The DB_RECNO option from DB_File uses a single-byte record separator,
>> so that's out.  Anything else?
> Why do the details of the record separator, a purely internal detail,
> matter?

I need to be able to delimit arbitrary data -- for instance, packed  
ints which may contain bytes that look like nulls or newlines.  The  
documentation for DB_File seems to indicate that DB_RECNO is for text  

"DB_RECNO provides an interface to flat text files. Both variable and  
fixed length records are supported... "

It goes on to talk about the the delimiter as being a single byte  
only...  If you could use a 16 byte random string as a delimiter,  
then you could probabilistically get away with delimiting arbitrary  
data, though I wonder how long inititialization would take for a big  

It would have been clearer if I'd elaborated on my assumption: Since  
DB_File DB_RECNO uses a single byte record separator -- rather than  
addressing information (!) -- it's appropriate only for text files.   
Short ones.

I'm surprised that no one's suggested a module close to what I  
described.  I'll consider breaking this code out of Kinosearch.

Marvin Humphrey
Rectangular Research

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