Added comments

user/cgi.c

@@ -1,5 +1,6 @@
 /*
-Some random cgi routines.
+Some random cgi routines. Used in the LED example and the page that returns the entire
+flash as a binary. Also handles the hit counter on the main page.
 */
 
 /*
@@ -94,6 +95,7 @@ int ICACHE_FLASH_ATTR cgiReadFlash(HttpdConnData *connData) {
 		*pos=0x40200000;
 		return HTTPD_CGI_MORE;
 	}
+	//Send 1K of flash per call. We will get called again if we haven't sent 512K yet.
 	espconn_sent(connData->conn, (uint8 *)(*pos), 1024);
 	*pos+=1024;
 	if (*pos>=0x40200000+(512*1024)) return HTTPD_CGI_DONE; else return HTTPD_CGI_MORE;

user/cgiwifi.c

@@ -71,9 +71,12 @@ void ICACHE_FLASH_ATTR wifiScanDoneCb(void *arg, STATUS status) {
 	bss_link = (struct bss_info *)arg;
 	while (bss_link != NULL) {
 		if (n>=cgiWifiAps.noAps) {
+			//This means the bss_link changed under our nose. Shouldn't happen!
+			//Break because otherwise we will write in unallocated memory.
 			os_printf("Huh? I have more than the allocated %d aps!\n", cgiWifiAps.noAps);
 			break;
 		}
+		//Save the ap data.
 		cgiWifiAps.apData[n]=(ApData *)os_malloc(sizeof(ApData));
 		cgiWifiAps.apData[n]->rssi=bss_link->rssi;
 		cgiWifiAps.apData[n]->enc=bss_link->authmode;
@@ -92,14 +95,15 @@ static void ICACHE_FLASH_ATTR wifiStartScan() {
 //	int x;
 	if (cgiWifiAps.scanInProgress) return;
 	cgiWifiAps.scanInProgress=1;
-/*
+#if 0
+	//Not sure if this is still needed.
 	x=wifi_station_get_connect_status();
 	if (x!=STATION_GOT_IP) {
 		//Unit probably is trying to connect to a bogus AP. This messes up scanning. Stop that.
 		os_printf("STA status = %d. Disconnecting STA...\n", x);
 		wifi_station_disconnect();
 	}
-*/
+#endif
 	wifi_station_scan(NULL, wifiScanDoneCb);
 }
 
@@ -115,13 +119,16 @@ int ICACHE_FLASH_ATTR cgiWiFiScan(HttpdConnData *connData) {
 	httpdEndHeaders(connData);
 
 	if (cgiWifiAps.scanInProgress==1) {
+		//We're still scanning. Tell Javascript code that.
 		len=os_sprintf(buff, "{\n \"result\": { \n\"inProgress\": \"1\"\n }\n}\n");
 		espconn_sent(connData->conn, (uint8 *)buff, len);
 	} else {
+		//We have a scan result. Pass it on.
 		len=os_sprintf(buff, "{\n \"result\": { \n\"inProgress\": \"0\", \n\"APs\": [\n");
 		espconn_sent(connData->conn, (uint8 *)buff, len);
 		if (cgiWifiAps.apData==NULL) cgiWifiAps.noAps=0;
 		for (i=0; i<cgiWifiAps.noAps; i++) {
+			//Fill in json code for an access point
 			len=os_sprintf(buff, "{\"essid\": \"%s\", \"rssi\": \"%d\", \"enc\": \"%d\"}%s\n", 
 					cgiWifiAps.apData[i]->ssid, cgiWifiAps.apData[i]->rssi, 
 					cgiWifiAps.apData[i]->enc, (i==cgiWifiAps.noAps-1)?"":",");
@@ -129,6 +136,7 @@ int ICACHE_FLASH_ATTR cgiWiFiScan(HttpdConnData *connData) {
 		}
 		len=os_sprintf(buff, "]\n}\n}\n");
 		espconn_sent(connData->conn, (uint8 *)buff, len);
+		//Also start a new scan.
 		wifiStartScan();
 	}
 	return HTTPD_CGI_DONE;
@@ -137,6 +145,14 @@ int ICACHE_FLASH_ATTR cgiWiFiScan(HttpdConnData *connData) {
 //Temp store for new ap info.
 static struct station_config stconf;
 
+/*
+ToDo:
+- Thoroughly test this code
+- Simplify if possible. The cascaded delayed routines are probably not
+  needed anymore. I hope.
+*/
+
+
 //This routine is ran some time after a connection attempt to an access point. If
 //the connect succeeds, this gets the module in STA-only mode.
 static void ICACHE_FLASH_ATTR resetTimerCb(void *arg) {
@@ -148,6 +164,7 @@ static void ICACHE_FLASH_ATTR resetTimerCb(void *arg) {
 		system_restart();
 	} else {
 		os_printf("Connect fail. Not going into STA-only mode.\n");
+		//Maybe also pass this through on the webpage?
 	}
 }
 
@@ -193,7 +210,7 @@ int ICACHE_FLASH_ATTR cgiWiFiConnect(HttpdConnData *connData) {
 	//Schedule disconnect/connect
 	os_timer_disarm(&reassTimer);
 	os_timer_setfn(&reassTimer, reassTimerCb, NULL);
-#if 1
+#if 1 //Set to 0 if you want to disable the actual reconnecting bit
 	os_timer_arm(&reassTimer, 1000, 0);
 
 	httpdRedirect(connData, "connecting.html");

user/espfs.c

@@ -81,6 +81,8 @@ a memory exception, crashing the program.
 
 //Copies len bytes over from dst to src, but does it using *only*
 //aligned 32-bit reads. Yes, it's no too optimized but it's short and sweet and it works.
+
+//ToDo: perhaps os_memcpy also does unaligned accesses?
 void ICACHE_FLASH_ATTR memcpyAligned(char *dst, char *src, int len) {
 	int x;
 	int w, b;

user/httpd.c

@@ -1,4 +1,6 @@
-//Esp8266 http server - core routines
+/*
+Esp8266 http server - core routines
+*/
 
 /*
  * ----------------------------------------------------------------------------
@@ -32,7 +34,7 @@
 //This gets set at init time.
 static HttpdBuiltInUrl *builtInUrls;
 
-//Private data for httpd thing
+//Private data for http connection
 struct HttpdPriv {
 	char head[MAX_HEAD_LEN];
 	int headPos;
@@ -43,10 +45,11 @@ struct HttpdPriv {
 static HttpdPriv connPrivData[MAX_CONN];
 static HttpdConnData connData[MAX_CONN];
 
+//Listening connection data
 static struct espconn httpdConn;
 static esp_tcp httpdTcp;
 
-
+//Struct to keep extension->mime data in
 typedef struct {
 	const char *ext;
 	const char *mimetype;
@@ -72,7 +75,8 @@ const char ICACHE_FLASH_ATTR *httpdGetMimetype(char *url) {
 	char *ext=url+(strlen(url)-1);
 	while (ext!=url && *ext!='.') ext--;
 	if (*ext=='.') ext++;
-
+	
+	//ToDo: os_strcmp is case sensitive; we may want to do case-intensive matching here...
 	while (mimeTypes[i].ext!=NULL && os_strcmp(ext, mimeTypes[i].ext)!=0) i++;
 	return mimeTypes[i].mimetype;
 }
@@ -134,7 +138,8 @@ int httpdUrlDecode(char *val, int valLen, char *ret, int retLen) {
 //Find a specific arg in a string of get- or post-data.
 //Line is the string of post/get-data, arg is the name of the value to find. The
 //zero-terminated result is written in buff, with at most buffLen bytes used. The
-//function returns the length of the result, or -1 if the value wasn't found.
+//function returns the length of the result, or -1 if the value wasn't found. The 
+//returned string will be urldecoded already.
 int ICACHE_FLASH_ATTR httpdFindArg(char *line, char *arg, char *buff, int buffLen) {
 	char *p, *e;
 	if (line==NULL) return 0;
@@ -160,7 +165,7 @@ int ICACHE_FLASH_ATTR httpdFindArg(char *line, char *arg, char *buff, int buffLe
 void ICACHE_FLASH_ATTR httpdStartResponse(HttpdConnData *conn, int code) {
 	char buff[128];
 	int l;
-	l=os_sprintf(buff, "HTTP/1.0 %d OK\r\nServer: esp8266-httpd/0.1\r\n", code);
+	l=os_sprintf(buff, "HTTP/1.0 %d OK\r\nServer: esp8266-httpd/"HTTPDVER"\r\n", code);
 	espconn_sent(conn->conn, (uint8 *)buff, l);
 }
 
@@ -177,7 +182,8 @@ void ICACHE_FLASH_ATTR httpdEndHeaders(HttpdConnData *conn) {
 	espconn_sent(conn->conn, (uint8 *)"\r\n", 2);
 }
 
-//ToDo: sprintf->snprintf everywhere
+//ToDo: sprintf->snprintf everywhere... esp doesn't have snprintf tho' :/
+//Redirect to the given URL.
 void ICACHE_FLASH_ATTR httpdRedirect(HttpdConnData *conn, char *newUrl) {
 	char buff[1024];
 	int l;
@@ -185,6 +191,7 @@ void ICACHE_FLASH_ATTR httpdRedirect(HttpdConnData *conn, char *newUrl) {
 	espconn_sent(conn->conn, (uint8 *)buff, l);
 }
 
+//Use this as a cgi function to redirect one url to another.
 int ICACHE_FLASH_ATTR cgiRedirect(HttpdConnData *connData) {
 	if (connData->conn==NULL) {
 		//Connection aborted. Clean up.
@@ -195,7 +202,8 @@ int ICACHE_FLASH_ATTR cgiRedirect(HttpdConnData *connData) {
 	return HTTPD_CGI_DONE;
 }
 
-
+//Callback called when the data on a socket has been successfully
+//sent.
 static void ICACHE_FLASH_ATTR httpdSentCb(void *arg) {
 	int r;
 	HttpdConnData *conn=httpdFindConnData(arg);
@@ -216,6 +224,8 @@ static void ICACHE_FLASH_ATTR httpdSentCb(void *arg) {
 
 static const char *httpNotFoundHeader="HTTP/1.0 404 Not Found\r\nServer: esp8266-httpd/0.1\r\nContent-Type: text/plain\r\n\r\nNot Found.\r\n";
 
+//This is called when the headers have been received and the connection is ready to send
+//the result headers and data.
 static void ICACHE_FLASH_ATTR httpdSendResp(HttpdConnData *conn) {
 	int i=0;
 	int r;
@@ -241,6 +251,7 @@ static void ICACHE_FLASH_ATTR httpdSendResp(HttpdConnData *conn) {
 	conn->cgi=NULL; //mark for destruction
 }
 
+//Parse a line of header data and modify the connection data accordingly.
 static void ICACHE_FLASH_ATTR httpdParseHeader(char *h, HttpdConnData *conn) {
 	int i;
 //	os_printf("Got header %s\n", h);
@@ -258,6 +269,7 @@ static void ICACHE_FLASH_ATTR httpdParseHeader(char *h, HttpdConnData *conn) {
 		*e=0; //terminate url part
 
 		os_printf("URL = %s\n", conn->url);
+		//Parse out the URL part before the GET parameters.
 		conn->getArgs=(char*)os_strstr(conn->url, "?");
 		if (conn->getArgs!=0) {
 			*conn->getArgs=0;
@@ -268,15 +280,20 @@ static void ICACHE_FLASH_ATTR httpdParseHeader(char *h, HttpdConnData *conn) {
 		}
 	} else if (os_strncmp(h, "Content-Length: ", 16)==0) {
 		i=0;
+		//Skip trailing spaces
 		while (h[i]!=' ') i++;
+		//Get POST data length
 		conn->postLen=atoi(h+i+1);
+		//Clamp if too big. Hmm, maybe we should error out instead?
 		if (conn->postLen>MAX_POST) conn->postLen=MAX_POST;
 		os_printf("Mallocced buffer for %d bytes of post data.\n", conn->postLen);
+		//Alloc the memory.
 		conn->postBuff=(char*)os_malloc(conn->postLen+1);
 		conn->priv->postPos=0;
 	}
 }
 
+//Callback called when there's data available on a socket.
 static void ICACHE_FLASH_ATTR httpdRecvCb(void *arg, char *data, unsigned short len) {
 	int x;
 	char *p, *e;
@@ -285,7 +302,6 @@ static void ICACHE_FLASH_ATTR httpdRecvCb(void *arg, char *data, unsigned short
 
 
 	for (x=0; x<len; x++) {
-
 		if (conn->priv->headPos!=-1) {
 			//This byte is a header byte.
 			if (conn->priv->headPos!=MAX_HEAD_LEN) conn->priv->head[conn->priv->headPos++]=data[x];

user/httpd.h

@@ -4,6 +4,8 @@
 #include "lwip/ip_addr.h"
 #include <espconn.h>
 
+#define HTTPDVER "0.2"
+
 #define HTTPD_CGI_MORE 0
 #define HTTPD_CGI_DONE 1
 #define HTTPD_CGI_NOTFOUND 2

user/httpdespfs.c

@@ -1,5 +1,5 @@
 /*
-Connector to let httpd use the espfs filesystem to serve the files in that.
+Connector to let httpd use the espfs filesystem to serve the files in it.
 */
 
 /*