[YQTemplate] №2: Squash some bugs

utils.lua

@@ -77,21 +77,29 @@ end
 --- file upload for the type of the uploaded file.
 --- - Fourthly we assume a field name can't contain a double quote
 _m.parse_form_entry = function(entry)
+   if #entry < 10 then return "", nil, "" end
    local cursor = 3
    local name, ctype
    while true do
+      local oldcursor = cursor
       if entry:sub(cursor, cursor) == "\r" then
 	 cursor = cursor + 2
 	 break
       elseif entry:sub(cursor, cursor+18) == 'Content-Disposition' then
 	 cursor = cursor + 38
 	 name = string.match(entry, "(.*)\"", cursor)
-	 cursor = cursor + #name + 1 --[[ the closing quote ]] + 2 --[[ CRLF ]]
+	 cursor = cursor + #name + 1 --[[ the closing quote ]]
+	 -- Find the end of line
+	 while entry:sub(cursor, cursor) ~= "\r" do cursor = cursor + 1 end
+	 cursor = cursor + 2
       elseif entry:sub(cursor, cursor+11) == 'Content-Type' then
 	 cursor = cursor + 14
 	 ctype = string.match(entry, "(.*)\r", cursor)
-	 cursor = cursor + #ctype + 2 --[[ CRLF ]]
+	 cursor = cursor + #ctype
+	 while entry:sub(cursor, cursor) ~= "\r" do cursor = cursor + 1 end
+	 cursor = cursor + 2 --[[ CRLF ]]
       end
+      if cursor == oldcursor then print(entry) os.exit(1); end
    end
    return name, ctype, entry:sub(cursor, -1)
 end