Aaron Muir Hamilton authored Apr 16, 2017 and Olaf Meeuwissen committed Apr 30, 2017

  This cuts out some duplicate code, and enables us to reuse this
  logic for PNG, JPEG, and any other future output format.
  sanei_load_icc_profile also allows us to know that an ICC profile
  file is not long enough before we start to write it to the output;
  this should prevent poorly-written software from overflowing into
  image data when they read the bad profile based on its length.