sip - Problems with parsing a text header packet in c++ -


i trying parse header packet of sip protocol (similar http) text based protocol. fields in header not have order. ex: if there 3 fields, f1, f2, , f3 can come in order number of times f3, f2 , f1, f1.

this increasing complexity of parser since don't know come first.

what should overcome complexity?

ultimately, need decouple processing order of receipt. that, have loop repeats while fields encountered, , inside loop determine field type is, dispatch processing field type. if can process fields great, if need save potentially multiple values given field type might - example - put them vector or shared multimap keyed on field name or id.

pseudo-code:

field x; while (x = get_next_field(input)) {     switch (x.type())     {        case type1: field1_values.push_back(x.value()); break;        case type2: field2 = x.value(); break;  // keep last value seen...        default: throw std::runtime_error("unsupported field type");     } }  // use field1_values / field2 etc. variables....

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