add base64 as format for read results

README.md

@@ -258,9 +258,10 @@ Read from an open file.
 
 #### Format
 
-| Format     | Description                                     |
-| ---------- | ----------------------------------------------- |
-| "identiy"  | Use data as is; note that json is UTF-8 encoded |
+| Format     | Description                                              |
+| ---------- | -------------------------------------------------------- |
+| "identiy"  | Use data as is; note that JSON strings are UTF-8 encoded |
+| "base64"   | data is base64 encoded                                   |
 
 # Build and run
 

example/www/js/filesystem.js

@@ -117,8 +117,8 @@ class FileSystem {
 			let end = Math.min(offset + length, entry.contents.length);
 			let data = (offset < entry.contents.length) ? entry.contents.substring(offset, end) : "";	
 			result = {
-				data: data,
-				format: "identity",
+				data: btoa(data),
+				format: "base64",
 				count: data.length
 			};
 		}

lib/wsfs/operation/read.c

@@ -4,6 +4,7 @@
 #include <string.h>
 #include <limits.h>
 #include <jansson.h>
+#include <libwebsockets.h>
 
 #include "wsfs/jsonrpc/server.h"
 
@@ -25,6 +26,10 @@ static wsfs_status wsfs_fill_buffer(
 		{
 			memcpy(buffer, data, copy_count);
 		}
+		else if (0 == strcmp("base64", format))
+		{
+			lws_b64_decode_string(data, buffer, copy_count);
+		}
 		else
 		{
 			status = WSFS_BAD;