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Thinking Recursively with C++

Mar 24, 2006

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Reading the Full ASN.1 Data Stream

Listing 6 illustrates the program output after processing the ASN.1 data in its entirety.

Listing 6 Complete Processing Cycle

Making the first call to parseAsnElement()
ASN element type is SEQUENCE 0x30
ASN element length is 12
Making a recursive call to parseAsnElement()
ASN element type is INTEGER 0x2
ASN element length is 2
Integer characters 1a
Making a recursive call to parseAsnElement()
ASN element type is STRING 0x4
ASN element length is 5
String character HELLO
Making a recursive call to parseAsnElement()

Processing starts with the sequence element (tag type 0x30) followed by a recursive call to parse the integer. Next, the string is parsed and then one final recursive call is made. The last call returns because there is no more data.

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