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POSocket Programming in C and Unserialize the Response
 

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  1. POSocket Programming in C and Unserialize the Response
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    <p>I'm writing a program to communicate with certain patient monitor using connection-less (UDP) sockets. I need a suggestion for the fastest and most efficient algorithm that I should use to parse the data received from patient monitor.</p> <p>Patient monitor sends data as AttributeList structure, the definition of the structure is below:-</p> <pre><code>typedef struct { uint16 count; uint16 length; AVAType * values; } AttributeList; typdef struct { uint16 id; uint16 length; void * data; } AVAType </code></pre> <p>So an AttributeList contains many AVAType structures, and every AVAType structure contains id and data as void pointer (data is just an place-holder for actual data in AVAType). In fact, there are about 150 ids defined for AVAType and each ID, data must be placed in some corresponding data structure for parsing purposes. </p> <p>So if ID in AVAType structure is 1, then data must be parsed using algorithm A but if ID is 2 then data must be parsed using Algorithm B and so on...</p> <p>My current approach is using 150 if-else statements and loading the particular data-structure for AVAType and then parse the result. Also the patient monitor sends data in network byter order and I need unpack the AVAType as per the ID. </p> <p>Please suggest some good approach to deal with this situation. It is just an university thing, I do not brother much about safety, I think safety can be improved gradually but right now my concern in speed.</p> <p>Yes, it is actaully AVAType values[];. Can you be more specific on why is this different from AVAType * ? Can it be any useful if I define my structure other way around?</p>
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    1. COmaybe you can create a hashmap, where key is the ID and value is a function pointer. This way you do not need if-else constructions, but can fetch the function for the algorithm from the hashtable. EDIT: as gbulmer said, array of function pointers is more reasonable.
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    2. COWhen dealing with patient monitors, shouldn't you focus more on reliability and safety than on speed?
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      1. USRoland Illig
    3. COunless you are working on an embedded system, with limited memory, I recommend using an array. It will be straightforward to debug, very predictable. The id is only 16bits, which is quite a small amount of storeage. It is very predictable on run-time, it is `fun_ptr[id](...)`. Becasue it is so simple, it should also ne straightforward to add functionality to auto test them all, and see that data and calls match.
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      1. USgbulmer
 

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