diff -r 7c2eb284f9f1 -r 038e3415100a project_files/frontlib/demo.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/project_files/frontlib/demo.c	Thu Jun 07 02:45:18 2012 +0200
@@ -0,0 +1,67 @@
+#include "demo.h"
+#include "logging.h"
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+
+static int demo_record(flib_vector demoBuffer, const void *data, size_t len) {
+	if(flib_vector_append(demoBuffer, data, len) < len) {
+		flib_log_e("Error recording demo: Out of memory.");
+		return -1;
+	} else {
+		return 0;
+	}
+}
+
+int flib_demo_record_from_engine(flib_vector demoBuffer, const uint8_t *message, const char *playerName) {
+	if(!demoBuffer || !message || !playerName) {
+		flib_log_e("Call to flib_demo_record_from_engine with demoBuffer==null or message==null or playerName==null");
+		return -1;
+	}
+
+	if(strchr("?CEiQqHb", message[1])) {
+		return 0; // Those message types are not recorded in a demo.
+	}
+
+	if(message[1] == 's') {
+		if(message[0] >= 3) {
+			// Chat messages are reformatted to make them look as if they were received, not sent.
+			// Get the actual chat message as C string
+			char chatMsg[256];
+			memcpy(chatMsg, message+2, message[0]-3);
+			chatMsg[message[0]-3] = 0;
+
+			// If the message starts with /me, it will be displayed differently.
+			char converted[257];
+			bool memessage = message[0] >= 7 && !memcmp(message+2, "/me ", 4);
+			const char *template = memessage ? "s\x02* %s %s  " : "s\x01%s: %s  ";
+			int size = snprintf(converted+1, 256, template, playerName, chatMsg);
+			converted[0] = size>255 ? 255 : size;
+			return demo_record(demoBuffer, converted, converted[0]+1);
+		} else {
+			return 0; // Malformed chat message is no reason to abort...
+		}
+	} else {
+		return demo_record(demoBuffer, message, message[0]+1);
+	}
+}
+
+int flib_demo_record_to_engine(flib_vector demoBuffer, const uint8_t *message, size_t len) {
+	if(!demoBuffer || (len>0 && !message)) {
+		flib_log_e("Call to flib_demo_record_to_engine with demoBuffer==null or message==null");
+		return -1;
+	}
+	return demo_record(demoBuffer, message, len);
+}
+
+void flib_demo_replace_gamemode(flib_buffer buf, char gamemode) {
+	size_t msgStart = 0;
+	char *data = (char*)buf.data;
+	while(msgStart+2 < buf.size) {
+		if(!memcmp(data+msgStart, "\x02T", 2)) {
+			data[msgStart+2] = gamemode;
+		}
+		msgStart += (uint8_t)data[msgStart]+1;
+	}
+}