Thanks to everyone who responded with ideas on this. John's suggestion of the TEC* functions was promising, but I ended up not using them when I discovered that they're not available on the iPhone. Ditto for Martin's suggestion of using getxattr.
I eventually ended up using Rainer's method (which was also suggested by Nick Z). I understand that it's not perfect, but it was good enough for what I was doing. And what was I doing.... I've just posted an open source CSV parser to github. I've had occasion in the past for a parser that's more intelligent than -[NSString componentsSeparatedByString:@","], and have developed this one. However, I've also had need to use this parser on UTF16 files, hence my desire to be able to auto-discover file encodings. (There is, of course, an option to provide a known encoding when initializing the parser) Please check it out, fork it, and help me make improvements to it: http://github.com/davedelong/CHCSVParser Thanks for your help, everyone! Dave DeLong On Jul 30, 2010, at 9:50 PM, Michael Ash wrote: > > A nitpick: starting with those two bytes is a *strong suggestion* that > it's UTF-16, but it could just be, say, a Latin-1 file that starts > with "þÿ", or a random binary file that happens to start with that > byte sequence. > > One fact that's can be extremely useful for this sort of thing but > which seems to be little-known: due to the structure of UTF-8 it's > rare for a file to be valid UTF-8 by accident. Random data, or data > that isn't intended to be structured like UTF-8, is extremely unlikely > to happen to match the structure required by UTF-8 by coincidence. > Thus, if a file parses as UTF-8, you can be pretty confident that it > was supposed to be interpreted in that encoding. > > The same is, alas, not true of UTF-16. > > Mike
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