Long and multi-format path manipulation library?

Is there any open source open source library that supports all of the following?

• Unlimited path lengths (i.e. the only limit must be from a range size_t
  
  , not arbitrary limits, such as 256 characters)

• Basic manipulations such as canonicalization equivalent basename
  
  , dirname
  
  getting file extension, obtaining root, etc.

• All valid paths and file names in the style of Windows, such as \Rooted
  
  , Dir/
  
  , C:\Dir/foo
  
  , File
  
  , \\Computer\Dir/File
  
  , \\.\C:
  
  , Foo\./.\Bar:ADS
  
  or\\?\C:\Dir\Escaped:ADS:$DATA
  
  

  • I believe this should also cover POSIX-style paths, but if not, they should work too.

I'd prefer C ++, but C is great too.