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24.08.2011 13:57, Денис Черносов пишет:

> Нет, эта информация ненадёжная.

Не знаю, есть ли готовое, но google("file charset detection") говорит, что
http://sourceforge.net/projects/chsdet/
http://fredeaker.blogspot.com/2007/01/character-encoding-detection.html
http://www-archive.mozilla.org/projects/intl/detectorsrc.html

и даже есть теория
http://www-archive.mozilla.org/projects/intl/UniversalCharsetDetection.html