From 67fdec20726e48ba3a934cb25bb30d47ec4a4f29 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Yaroslav=20De=20La=20Pe=C3=B1a=20Smirnov?=
 <yaros.rus_89@live.com.mx>
Date: Wed, 29 Nov 2017 11:44:34 +0300
Subject: Initial commit, version 0.5.3

---
 node_modules/uws/src/Extensions.cpp | 131 ++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 node_modules/uws/src/Extensions.cpp

(limited to 'node_modules/uws/src/Extensions.cpp')

diff --git a/node_modules/uws/src/Extensions.cpp b/node_modules/uws/src/Extensions.cpp
new file mode 100644
index 0000000..ef8f9da
--- /dev/null
+++ b/node_modules/uws/src/Extensions.cpp
@@ -0,0 +1,131 @@
+#include "Extensions.h"
+
+namespace uWS {
+
+enum ExtensionTokens {
+    TOK_PERMESSAGE_DEFLATE = 1838,
+    TOK_SERVER_NO_CONTEXT_TAKEOVER = 2807,
+    TOK_CLIENT_NO_CONTEXT_TAKEOVER = 2783,
+    TOK_SERVER_MAX_WINDOW_BITS = 2372,
+    TOK_CLIENT_MAX_WINDOW_BITS = 2348
+};
+
+class ExtensionsParser {
+private:
+    int *lastInteger = nullptr;
+
+public:
+    bool perMessageDeflate = false;
+    bool serverNoContextTakeover = false;
+    bool clientNoContextTakeover = false;
+    int serverMaxWindowBits = 0;
+    int clientMaxWindowBits = 0;
+
+    int getToken(const char *&in, const char *stop);
+    ExtensionsParser(const char *data, size_t length);
+};
+
+int ExtensionsParser::getToken(const char *&in, const char *stop) {
+    while (!isalnum(*in) && in != stop) {
+        in++;
+    }
+
+    int hashedToken = 0;
+    while (isalnum(*in) || *in == '-' || *in == '_') {
+        if (isdigit(*in)) {
+            hashedToken = hashedToken * 10 - (*in - '0');
+        } else {
+            hashedToken += *in;
+        }
+        in++;
+    }
+    return hashedToken;
+}
+
+ExtensionsParser::ExtensionsParser(const char *data, size_t length) {
+    const char *stop = data + length;
+    int token = 1;
+    for (; token && token != TOK_PERMESSAGE_DEFLATE; token = getToken(data, stop));
+
+    perMessageDeflate = (token == TOK_PERMESSAGE_DEFLATE);
+    while ((token = getToken(data, stop))) {
+        switch (token) {
+        case TOK_PERMESSAGE_DEFLATE:
+            return;
+        case TOK_SERVER_NO_CONTEXT_TAKEOVER:
+            serverNoContextTakeover = true;
+            break;
+        case TOK_CLIENT_NO_CONTEXT_TAKEOVER:
+            clientNoContextTakeover = true;
+            break;
+        case TOK_SERVER_MAX_WINDOW_BITS:
+            serverMaxWindowBits = 1;
+            lastInteger = &serverMaxWindowBits;
+            break;
+        case TOK_CLIENT_MAX_WINDOW_BITS:
+            clientMaxWindowBits = 1;
+            lastInteger = &clientMaxWindowBits;
+            break;
+        default:
+            if (token < 0 && lastInteger) {
+                *lastInteger = -token;
+            }
+            break;
+        }
+    }
+}
+
+template <bool isServer>
+ExtensionsNegotiator<isServer>::ExtensionsNegotiator(int wantedOptions) {
+    options = wantedOptions;
+}
+
+template <bool isServer>
+std::string ExtensionsNegotiator<isServer>::generateOffer() {
+    std::string extensionsOffer;
+    if (options & Options::PERMESSAGE_DEFLATE) {
+        extensionsOffer += "permessage-deflate";
+
+        if (options & Options::CLIENT_NO_CONTEXT_TAKEOVER) {
+            extensionsOffer += "; client_no_context_takeover";
+        }
+
+        if (options & Options::SERVER_NO_CONTEXT_TAKEOVER) {
+            extensionsOffer += "; server_no_context_takeover";
+        }
+    }
+
+    return extensionsOffer;
+}
+
+template <bool isServer>
+void ExtensionsNegotiator<isServer>::readOffer(std::string offer) {
+    if (isServer) {
+        ExtensionsParser extensionsParser(offer.data(), offer.length());
+        if ((options & PERMESSAGE_DEFLATE) && extensionsParser.perMessageDeflate) {
+            if (extensionsParser.clientNoContextTakeover || (options & CLIENT_NO_CONTEXT_TAKEOVER)) {
+                options |= CLIENT_NO_CONTEXT_TAKEOVER;
+            }
+
+            if (extensionsParser.serverNoContextTakeover) {
+                options |= SERVER_NO_CONTEXT_TAKEOVER;
+            } else {
+                options &= ~SERVER_NO_CONTEXT_TAKEOVER;
+            }
+        } else {
+            options &= ~PERMESSAGE_DEFLATE;
+        }
+    } else {
+        // todo!
+    }
+}
+
+template <bool isServer>
+int ExtensionsNegotiator<isServer>::getNegotiatedOptions() {
+    return options;
+}
+
+template class ExtensionsNegotiator<true>;
+template class ExtensionsNegotiator<false>;
+
+}
-- 
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