add boost on mac

macx64/include/boost/beast/websocket/detail/pmd_extension.ipp

@@ -0,0 +1,310 @@
+//
+// 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_PMD_EXTENSION_IPP
+#define BOOST_BEAST_WEBSOCKET_DETAIL_PMD_EXTENSION_IPP
+
+#include <boost/beast/websocket/detail/pmd_extension.hpp>
+
+namespace boost {
+namespace beast {
+namespace websocket {
+namespace detail {
+
+int
+parse_bits(string_view s)
+{
+    if(s.size() == 0)
+        return -1;
+    if(s.size() > 2)
+        return -1;
+    if(s[0] < '1' || s[0] > '9')
+        return -1;
+    unsigned i = 0;
+    for(auto c : s)
+    {
+        if(c < '0' || c > '9')
+            return -1;
+        auto const i0 = i;
+        i = 10 * i + (c - '0');
+        if(i < i0)
+            return -1;
+    }
+    return static_cast<int>(i);
+}
+
+// Parse permessage-deflate request fields
+//
+void
+pmd_read_impl(pmd_offer& offer, http::ext_list const& list)
+{
+    offer.accept = false;
+    offer.server_max_window_bits= 0;
+    offer.client_max_window_bits = 0;
+    offer.server_no_context_takeover = false;
+    offer.client_no_context_takeover = false;
+
+    for(auto const& ext : list)
+    {
+        if(iequals(ext.first, "permessage-deflate"))
+        {
+            for(auto const& param : ext.second)
+            {
+                if(iequals(param.first,
+                    "server_max_window_bits"))
+                {
+                    if(offer.server_max_window_bits != 0)
+                    {
+                        // The negotiation offer contains multiple
+                        // extension parameters with the same name.
+                        //
+                        return; // MUST decline
+                    }
+                    if(param.second.empty())
+                    {
+                        // The negotiation offer extension
+                        // parameter is missing the value.
+                        //
+                        return; // MUST decline
+                    }
+                    offer.server_max_window_bits =
+                        parse_bits(param.second);
+                    if( offer.server_max_window_bits < 8 ||
+                        offer.server_max_window_bits > 15)
+                    {
+                        // The negotiation offer contains an
+                        // extension parameter with an invalid value.
+                        //
+                        return; // MUST decline
+                    }
+                }
+                else if(iequals(param.first,
+                    "client_max_window_bits"))
+                {
+                    if(offer.client_max_window_bits != 0)
+                    {
+                        // The negotiation offer contains multiple
+                        // extension parameters with the same name.
+                        //
+                        return; // MUST decline
+                    }
+                    if(! param.second.empty())
+                    {
+                        offer.client_max_window_bits =
+                            parse_bits(param.second);
+                        if( offer.client_max_window_bits < 8 ||
+                            offer.client_max_window_bits > 15)
+                        {
+                            // The negotiation offer contains an
+                            // extension parameter with an invalid value.
+                            //
+                            return; // MUST decline
+                        }
+                    }
+                    else
+                    {
+                        offer.client_max_window_bits = -1;
+                    }
+                }
+                else if(iequals(param.first,
+                    "server_no_context_takeover"))
+                {
+                    if(offer.server_no_context_takeover)
+                    {
+                        // The negotiation offer contains multiple
+                        // extension parameters with the same name.
+                        //
+                        return; // MUST decline
+                    }
+                    if(! param.second.empty())
+                    {
+                        // The negotiation offer contains an
+                        // extension parameter with an invalid value.
+                        //
+                        return; // MUST decline
+                    }
+                    offer.server_no_context_takeover = true;
+                }
+                else if(iequals(param.first,
+                    "client_no_context_takeover"))
+                {
+                    if(offer.client_no_context_takeover)
+                    {
+                        // The negotiation offer contains multiple
+                        // extension parameters with the same name.
+                        //
+                        return; // MUST decline
+                    }
+                    if(! param.second.empty())
+                    {
+                        // The negotiation offer contains an
+                        // extension parameter with an invalid value.
+                        //
+                        return; // MUST decline
+                    }
+                    offer.client_no_context_takeover = true;
+                }
+                else
+                {
+                    // The negotiation offer contains an extension
+                    // parameter not defined for use in an offer.
+                    //
+                    return; // MUST decline
+                }
+            }
+            offer.accept = true;
+            return;
+        }
+    }
+}
+
+static_string<512>
+pmd_write_impl(pmd_offer const& offer)
+{
+    static_string<512> s = "permessage-deflate";
+    if(offer.server_max_window_bits != 0)
+    {
+        if(offer.server_max_window_bits != -1)
+        {
+            s += "; server_max_window_bits=";
+            s += to_static_string(
+                offer.server_max_window_bits);
+        }
+        else
+        {
+            s += "; server_max_window_bits";
+        }
+    }
+    if(offer.client_max_window_bits != 0)
+    {
+        if(offer.client_max_window_bits != -1)
+        {
+            s += "; client_max_window_bits=";
+            s += to_static_string(
+                offer.client_max_window_bits);
+        }
+        else
+        {
+            s += "; client_max_window_bits";
+        }
+    }
+    if(offer.server_no_context_takeover)
+    {
+        s += "; server_no_context_takeover";
+    }
+    if(offer.client_no_context_takeover)
+    {
+        s += "; client_no_context_takeover";
+    }
+
+    return s;
+}
+
+static_string<512>
+pmd_negotiate_impl(
+    pmd_offer& config,
+    pmd_offer const& offer,
+    permessage_deflate const& o)
+{
+    static_string<512> s = "permessage-deflate";
+
+    config.server_no_context_takeover =
+        offer.server_no_context_takeover ||
+            o.server_no_context_takeover;
+    if(config.server_no_context_takeover)
+        s += "; server_no_context_takeover";
+
+    config.client_no_context_takeover =
+        o.client_no_context_takeover ||
+            offer.client_no_context_takeover;
+    if(config.client_no_context_takeover)
+        s += "; client_no_context_takeover";
+
+    if(offer.server_max_window_bits != 0)
+        config.server_max_window_bits = (std::min)(
+            offer.server_max_window_bits,
+                o.server_max_window_bits);
+    else
+        config.server_max_window_bits =
+            o.server_max_window_bits;
+    if(config.server_max_window_bits < 15)
+    {
+        // ZLib's deflateInit silently treats 8 as
+        // 9 due to a bug, so prevent 8 from being used.
+        //
+        if(config.server_max_window_bits < 9)
+            config.server_max_window_bits = 9;
+
+        s += "; server_max_window_bits=";
+        s += to_static_string(
+            config.server_max_window_bits);
+    }
+
+    switch(offer.client_max_window_bits)
+    {
+    case -1:
+        // extension parameter is present with no value
+        config.client_max_window_bits =
+            o.client_max_window_bits;
+        if(config.client_max_window_bits < 15)
+        {
+            s += "; client_max_window_bits=";
+            s += to_static_string(
+                config.client_max_window_bits);
+        }
+        break;
+
+    case 0:
+        /*  extension parameter is absent.
+
+            If a received extension negotiation offer doesn't have the
+            "client_max_window_bits" extension parameter, the corresponding
+            extension negotiation response to the offer MUST NOT include the
+            "client_max_window_bits" extension parameter.
+        */
+        if(o.client_max_window_bits == 15)
+            config.client_max_window_bits = 15;
+        else
+            config.accept = false;
+        break;
+
+    default:
+        // extension parameter has value in [8..15]
+        config.client_max_window_bits = (std::min)(
+            o.client_max_window_bits,
+                offer.client_max_window_bits);
+        s += "; client_max_window_bits=";
+        s += to_static_string(
+            config.client_max_window_bits);
+        break;
+    }
+
+    return s;
+}
+
+void
+pmd_normalize(pmd_offer& offer)
+{
+    if(offer.accept)
+    {
+        if( offer.server_max_window_bits == 0)
+            offer.server_max_window_bits = 15;
+
+        if( offer.client_max_window_bits ==  0 ||
+            offer.client_max_window_bits == -1)
+            offer.client_max_window_bits = 15;
+    }
+}
+
+} // detail
+} // websocket
+} // beast
+} // boost
+
+#endif // BOOST_BEAST_WEBSOCKET_DETAIL_PMD_EXTENSION_IPP