Add basic proxy parser

src/ProxyParser.h

@@ -0,0 +1,44 @@
+//
+
+// implements PROXY v2 protocol
+
+
+
+struct ProxyParser {
+    int done = false;
+
+    // 16 byte IP, 2 byte port
+    // 16 byte our IP, 2 byte our port
+
+    // return true when done, always return next offset for http parsing
+    std::pair<bool, unsigned int> parse(std::string_view data) {
+
+        /* If already parsed, we're done */
+        if (done) {
+            return {true, 0};
+        }
+
+        // we require 4 bytes to determine if this is http or not
+        if (data.length() < 4) {
+            // we are not done, buffer everything
+            return {false, 0};
+        } else {
+
+
+            // is this proxy protocol?
+            if (memcmp("\r\n\r\n", data.data(), 4) == 0) {
+
+
+
+            } else {
+                // it cannot be proxy protocol here, so we are done now
+                done = true;
+                return {true, 0};
+            }
+
+
+        }
+
+    }
+
+};