Remove base64 heads from array - whammy.js

Kompressor.coffee

# remove the heads off arrays of base_64 encoded datauris
#
# in this example we take the array of images encoded from
# whammy.js and return an array without the heads. This is
# an admittedly vain optimization but, every byte counts.

Base64Header = (type) ->
  head: "data:#{type};base64,"
  add: (string) ->
    "#{HEAD}#{string}"
  remove: (string) ->
    string.replace HEAD, ''

Kompressor = (type) ->
  header  = Base64Header(type)
  compress: (frames) ->
    frames.map header.remove
  decompress: (frames) ->
    frames.map header.add

webpKompressor = Kompressor('image/webp')

compressedFrames = webpKompressor.compress frames

uncompressedFrames = webpKompressor.decompress fames