I am currently working with ASN.1 to ensure that the data structures
used by myself and our suppliers conform to a generic standard when
passing messages over the network. The application I have written has
been established now for a number of years and is written in C++. The
ASN.1 compiler being used is the snacc compiler version 1.3.
I have a problem though in that when I decode a message from a network
representation into ASN.1, I first create an AsnBuf and then call the
function InstallData. Then set the mode to be read only. This all works
fine but then when I call the Decode routine (in the case of the snacc
compiler it is BDecPdu) the memory gets allocated by the system and the
underlying message is extracted. However that memory does not seem to be
released, until the end of the application.
The problem is that I have a machine with 1.5 GB of memory where about
1.17Gb is used during my application run. The application passes
messages of about 800 bytes through at 10-12 a second. The memory starts
off at 139MB and grows at about 1MB a second. When I use a leak detector
application it tells me that the decode routine of the ASN.1 is causing
a lot of memory leaks, and yet I have seen through using debug that a call
is made to the destructor for each of the ASN.1 message types created, thus
calling delete to get rid of each of the underlying types created.
Can you by any chance help me in trying to identify why the memory is
being used up so much.
Many thanks for your time and effort.
Simon Kearn
Software Engineer
*simon.kearn@xxxxxxxx