Confirm the *length* of imported .bin files (must be evenly divisble by

avatar size) before copying to text/avatars.
Use '-file=<filename>', rather than -f.
Export/share an avatar library like this:
  jsexec avatars export=syncdata -file=../text/avatars/custom.bin
Export user's avatars like this:
  jsexec avatars export=syncdata -users
Import avatars (users and shared libraries), like this:
  jsexec avatars import=syncdata
(replace syncdata with the correct code for the syncdata sub)

exec/avatars.js

@@ -133,12 +133,13 @@ function import_shared_file(hdr, body)
 		return false;
 	}
 	if(sauce.datatype != SAUCE.defs.datatype.bin
-		|| sauce.cols != lib.defs.width) {
-		alert(format("%s has invalid SAUCE! (%u %u)"
-			,file.name, sauce.datatype, sauce.cols));
+		|| sauce.cols != lib.defs.width
+		|| (sauce.filesize%lib.size) != 0) {
+		alert(format("%s has invalid SAUCE! (datatype=%u cols=%u size=%u)"
+			,file.name, sauce.datatype, sauce.cols, sauce.filesize));
 		return false;
 	}
-	var new_path = format("%savatars/%s", system.text_dir, filename);
+	var new_path = format("%s%s", lib.local_library(), filename);
 	var result = file_copy(file.name, new_path);
 	if(!result)
 		alert("ERROR copying " + file.name + " to " + new_path);
@@ -294,7 +295,7 @@ function main()
 		optval[arg] = val;
 
         switch(arg) {
-			case '-f':
+			case '-file':
 				filename = val;
 				break;
 			case '-offset':
@@ -320,7 +321,7 @@ function main()
 				break;
 		}
 	}
-
+	mkdir(lib.local_library());
 	for(var c in cmds) {
 		var cmd = cmds[c].toLowerCase();
 		switch(cmd) {

exec/load/avatar_lib.js

@@ -7,6 +7,8 @@ const defs = {
 	height: 6,
 };
 
+const size = defs.width * defs.height * 2;	// 2 bytes per cell for char and attributes
+
 function local_library()
 {
 	return format("%savatars/", system.text_dir);