unpack_object_header_gently

in lib/grit/git-ruby/internal/loose.rb [102:126]

• 22 lines of code
• 5 McCabe index (conditional complexity)

        def unpack_object_header_gently(buf)
          used = 0
          c = buf.getord(used)
          used += 1

          type = (c >> 4) & 7;
          size = c & 15;
          shift = 4;
          while c & 0x80 != 0
            if buf.bytesize <= used
              raise LooseObjectError, "object file too short"
            end
            c = buf.getord(used)
            used += 1

            size += (c & 0x7f) << shift
            shift += 7
          end
          type = OBJ_TYPES[type]
          if ![:blob, :tree, :commit, :tag].include?(type)
            raise LooseObjectError, "invalid loose object type"
          end
          return [type, size, used]
        end