Support for different formats in a single stream

This is probably not a use case that this module should be used for, but I am hoping there may be an easy way to make this work...

I have an input stream that has the following format:

Col1,Col2,Col3
"Abc",1,2
"Xyz",3,4

Cl1,Cl2
"bla",1
"Bla bla",2
"Bla bla bla", 3

C1,C2,C3,C4
1,2,3,4
5,6,7,8
7,8,9,10

Any suggestions?

Thanks!
