add boost on mac

macx64/include/boost/beast/websocket/detail/utf8_checker.hpp

@@ -0,0 +1,96 @@
+//
+// 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_UTF8_CHECKER_HPP
+#define BOOST_BEAST_WEBSOCKET_DETAIL_UTF8_CHECKER_HPP
+
+#include <boost/beast/core/buffers_range.hpp>
+#include <boost/asio/buffer.hpp>
+
+#include <cstdint>
+
+namespace boost {
+namespace beast {
+namespace websocket {
+namespace detail {
+
+/** A UTF8 validator.
+
+    This validator can be used to check if a buffer containing UTF8 text is
+    valid. The write function may be called incrementally with segmented UTF8
+    sequences. The finish function determines if all processed text is valid.
+*/
+class utf8_checker
+{
+    std::size_t need_ = 0;  // chars we need to finish the code point
+    std::uint8_t* p_ = cp_; // current position in temp buffer
+    std::uint8_t cp_[4];    // a temp buffer for the code point
+
+public:
+    /** Prepare to process text as valid utf8
+    */
+    BOOST_BEAST_DECL
+    void
+    reset();
+
+    /** Check that all processed text is valid utf8
+    */
+    BOOST_BEAST_DECL
+    bool
+    finish();
+
+    /** Check if text is valid UTF8
+
+        @return `true` if the text is valid utf8 or false otherwise.
+    */
+    BOOST_BEAST_DECL
+    bool
+    write(std::uint8_t const* in, std::size_t size);
+
+    /** Check if text is valid UTF8
+
+        @return `true` if the text is valid utf8 or false otherwise.
+    */
+    template<class ConstBufferSequence>
+    bool
+    write(ConstBufferSequence const& bs);
+};
+
+
+template<class ConstBufferSequence>
+bool
+utf8_checker::
+write(ConstBufferSequence const& buffers)
+{
+    static_assert(
+        net::is_const_buffer_sequence<ConstBufferSequence>::value,
+        "ConstBufferSequence type requirements not met");
+    for(auto b : beast::buffers_range_ref(buffers))
+        if(! write(static_cast<
+            std::uint8_t const*>(b.data()),
+                b.size()))
+            return false;
+    return true;
+}
+
+
+BOOST_BEAST_DECL
+bool
+check_utf8(char const* p, std::size_t n);
+
+} // detail
+} // websocket
+} // beast
+} // boost
+
+#if BOOST_BEAST_HEADER_ONLY
+#include <boost/beast/websocket/detail/utf8_checker.ipp>
+#endif
+
+#endif