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Source available at http://www.rarlab.com/rar_add.htm, third link from the top. UnRAR is a tool used to unpack RAR archives.
See screenshot of Instruments (MacOS X) profiling tool: http://i.imgur.com/JT5sz.png The above profile was done an archive containing a 1GB binary file containing dummy data.
- Method that takes the most time: CopyString(int, int) of the Unpack class
Source code of method: http://pastebin.com/0L3tMwAc