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# The PSD header describes all kinds of important information pertaining to
# the PSD file such as size, color channels, color depth, and so on.
class PSDHeader
# All of the sections that the header contains. These will become properties
# of the instantiated header object once parsed.
HEADER_SECTIONS = [
"sig"
"version"
# These are reserved bytes, always zero
"r0"
"r1"
"r2"
"r3"
"r4"
"r5"
"channels"
"rows"
"cols"
"depth"
"mode"
]
# Common names for various color modes, which are specified by an integer in
# the header.
MODES =
0: 'Bitmap'
1: 'GrayScale'
2: 'IndexedColor'
3: 'RGBColor'
4: 'CMYKColor'
5: 'HSLColor'
6: 'HSBColor'
7: 'Multichannel'
8: 'Duotone'
9: 'LabColor'
10: 'Gray16'
11: 'RGB48'
12: 'Lab48'
13: 'CMYK64'
14: 'DeepMultichannel'
15: 'Duotone16'
constructor: (@file) ->
parse: ->
# Read the header section
data = @file.readf ">4sH 6B HLLHH"
# Add all of the header sections as properties of this object.
@[section] = data.shift() for section in HEADER_SECTIONS
# Store size in an easy to use place for later
@size = [@rows, @cols]
# This must be 8BPS according to the spec, or else this is not a valid PSD
# file.
if @sig isnt "8BPS"
throw "Not a PSD signature: #{@header['sig']}"
# The spec only covers version 1 of PSDs. I believe this is the only
# version available at this time, anyways.
if @version isnt 1
throw "Can not handle PSD version #{@header['version']}"
# Store the common mode name
if 0 <= @mode < 16
@modename = MODES[@mode]
else
@modename = "(#{@mode})"
# Information about the color mode is a bit complex. We're skipping this
# for now. TODO.
@colormodepos = @file.pos
@file.skipBlock "color mode data"
toJSON: ->
data = {}
for section in HEADER_SECTIONS
data[section] = @[section]
# Some extra data
data.modename = @modename
data
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