Initial push

http.h

@@ -0,0 +1,59 @@
+#pragma once
+
+#include <stdlib.h>
+#include <sys/types.h>
+
+#include "util.h"
+
+#define HTTP_MAX_SIZE 8192
+#define HTTP_MAX_HEADERS 40
+
+/**
+ * Simple string tuple representing a HTTP header
+ */
+struct header {
+    string key;
+    string value;
+};
+
+/**
+ * Representation of a HTTP request
+ */
+struct request {
+    string method;
+    string uri;
+    struct header headers[HTTP_MAX_HEADERS];
+    char *payload;
+    ssize_t payload_length;
+};
+
+/**
+ * The state of an ongoing HTTP connection
+ *
+ * `sock`: the socket connected to the client
+ * `buffer`: buffer for the raw received data
+ * `end`: end of unprocessed data in `buffer`
+ * `current_request`: current, complete request, not yet answered to. Reuses
+ *                    memory of `buffer`.
+ */
+struct connection_state {
+    int sock;
+    char buffer[HTTP_MAX_SIZE];
+    char *end;
+    struct request current_request;
+};
+
+/**
+ * Parse HTTP request into the given structure.
+ *
+ * When a full request is read, `request` is populated with its corresponding
+ * values, utilizing the existing memory in `buffer`, and the number of bytes
+ * read is returned. Otherwise, `buffer` remains unchanged, and zero is
+ * returned.
+ */
+ssize_t parse_request(char *buffer, size_t n, struct request *request);
+
+/**
+ * Get value of header in request if set, or NULL.
+ */
+string get_header(const struct request *request, const string name);