Parses Adobe swatch exchange files (color palettes).

ase_reader.py

#!/usr/bin/env python
# coding: utf-8

# Based on SwatchBooker code. Original license follows

#
#       Copyright 2008 Olivier Berten <[email protected]>
#       
#       This program is free software; you can redistribute it and/or modify
#       it under the terms of the GNU General Public License as published by
#       the Free Software Foundation; either version 3 of the License, or
#       (at your option) any later version.
#       
#       This program is distributed in the hope that it will be useful,
#       but WITHOUT ANY WARRANTY; without even the implied warranty of
#       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#       GNU General Public License for more details.
#       
#       You should have received a copy of the GNU General Public License
#       along with this program; if not, write to the Free Software
#       Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
#       MA 02110-1301, USA.
#

import sys
import struct

class ase_reader( object):
  def __init__( self, callbacks):
		self._cb = callbacks

	def read( self, file):
		data = file.read(4)
		if struct.unpack( '4s', data)[0] != 'ASEF':
			self._cb.bad_header_id()
			return

		version = struct.unpack( '>2H',file.read(4))
		self._cb.set_version( version)
		nbblocks = struct.unpack( '>L',file.read(4))[0]
		self._cb.set_num_blocks( nbblocks)

		for i in range( nbblocks):
			name = False
			block_type, block_size = struct.unpack( '>HL',file.read(6))
			if block_size > 0:
				length = struct.unpack( '>H',file.read(2))[0]
				if length > 0:
					name = unicode( struct.unpack( str( length * 2) + 's', file.read( length * 2))[0], 'utf_16_be').split( '\x00', 1)[0]

			if block_type == 0xc001:
				self._cb.begin_group( name)
			elif block_type == 0xc002:
				self._cb.end_group()
			elif block_type == 0x0001:
				model = struct.unpack('4s',file.read(4))[0]
				color = { 'name': name}

				if model == "CMYK":
					color['value'] = list( struct.unpack( '>4f', file.read(16)))
					color['model'] = model
				elif model == "RGB ":
					color['value'] = list(struct.unpack( '>3f',file.read(12)))
					color['model'] = 'RGB'
				elif model == "LAB ":
					L,a,b = struct.unpack( '>3f',file.read(12))
					color['value'] = [L*100,a,b]
					color['model'] = 'LAB'
				elif model == "Gray":
					color['value'] = [1-struct.unpack( '>f',file.read(4))[0],]
					color['model'] = 'Gray'
				type = struct.unpack( '>H',file.read(2))[0]

				'''
				if type == 0:
					color['usage'] = 'global'
				elif type == 1:
					color['usage'] = 'spot'
				'''

				self._cb.add_color( color)

if __name__ == "__main__":

	class ase_reader_callbacks( object):
		def bad_header_id( self):
			print "bad header"

		def set_version( self, version):
			print "version = ", version

		def set_num_blocks( self, nblocks):
			print "nblocks = ", nblocks

		def begin_group( self, name):
			print "group ", name

		def end_group( self):
			print "group end"

		def add_color( self, col):
			print col['name'], col['value']

	f = open( "ps_swatches.ase", "rb")
	cb = ase_reader_callbacks()
	r = ase_reader( cb)
	r.read( f)