This software is provided 'as-is', without any express or implied warranty.
In no event will the author be held liable for any damages arising from the
use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:

 1. The origin of this software must not be misrepresented; you must not
    claim that you wrote the original software.
 2. If you use this software in a product, an acknowledgment in the product
    documentation would be appreciated but is not required. 
 3. Altered source versions must be plainly marked as such, and must not be
    misrepresented as being the original software.

Copyright (c) 2014 Jeff Snyder, https://github.com/je4d

Based on the Portable C++ Hashing Library by Stephan Brumme, used with
permission as granted by the license from
http://create.stephan-brumme.com/disclaimer.html, reproduced and reused above.
Copyright (c) 2014 Stephan Brumme