[poppler] How poppler deal with multiple charsets?

[杨辉强]

Hi, all:
      I am a newbie to poppler. Now I want to extract text in pdf file 
which contain Chinese GBK or other charsets.
      Whether the poppler can deal with this situation and how it do it? 
Now I am hacking the source code.
So I want to know which part of the source codes are related to dealing 
with multiple charsets.



Thank you very much.