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//
// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/boostorg/beast
//
#ifndef BOOST_BEAST_WEBSOCKET_DETAIL_MASK_IPP
#define BOOST_BEAST_WEBSOCKET_DETAIL_MASK_IPP
#include <boost/beast/websocket/detail/mask.hpp>
namespace boost {
namespace beast {
namespace websocket {
namespace detail {
void
prepare_key(prepared_key& prepared, std::uint32_t key)
{
prepared[0] = (key >> 0) & 0xff;
prepared[1] = (key >> 8) & 0xff;
prepared[2] = (key >> 16) & 0xff;
prepared[3] = (key >> 24) & 0xff;
}
inline
void
rol(prepared_key& v, std::size_t n)
{
auto v0 = v;
for(std::size_t i = 0; i < v.size(); ++i )
v[i] = v0[(i + n) % v.size()];
}
// Apply mask in place
//
void
mask_inplace(net::mutable_buffer const& b, prepared_key& key)
{
auto n = b.size();
auto const mask = key; // avoid aliasing
auto p = static_cast<unsigned char*>(b.data());
while(n >= 4)
{
for(int i = 0; i < 4; ++i)
p[i] ^= mask[i];
p += 4;
n -= 4;
}
if(n > 0)
{
for(std::size_t i = 0; i < n; ++i)
p[i] ^= mask[i];
rol(key, n);
}
}
} // detail
} // websocket
} // beast
} // boost
#endif
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