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Some optimization for encoding detection. I think there is no need to detect encoding manually, parser can do it for you, but I added some code for encoding detection from XML info header. Tested on some UTF-8 RSS and CP-1251 encoding (you can see diff at your head and my pull request at this link http://svpressa.ru/xml/news.xml).
See 9f57580 for memory leak fix. Sorry :)