lib/care.rb in format_parser-0.1.6 vs lib/care.rb in format_parser-0.1.7

@@ -23,10 +23,11 @@
     def pos
       @pos
     end
 
     def read(n_bytes)
+      return '' if n_bytes == 0 # As hardcoded for all Ruby IO objects
       read = @cache.byteslice(@io, @pos, n_bytes)
       return nil unless read && !read.empty?
       @pos += read.bytesize
       read
     end
@@ -60,10 +61,10 @@
     # If the IO has been exhausted, `nil` will be returned
     # instead. Will use the cached pages where available,
     # or fetch pages where necessary
     def byteslice(io, at, n_bytes)
       if n_bytes < 1
-        raise ArgumentError, "The number of bytes to fetch must be a positive Integer"
+        raise ArgumentError, "The number of bytes to fetch must be a positive Integer, but was #{n_bytes}"
       end
       if at < 0
         raise ArgumentError, "Negative offsets are not supported (got #{at})"
       end