Add layer comp parsing

examples/layer_comps.js

+var PSD = require('../');
+
+PSD.open('./examples/images/example.psd').then(function (psd) {
+  console.log(psd.resources.resource('layerComps').export());
+});
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lib/psd/resource.coffee

+Util = require './util.coffee'
+
+module.exports = class Resource
+  @Section: require('./resource_section.coffee')
+
+  constructor: (@file) ->
+    @id = null
+    @type = null
+    @length = 0
+
+  parse: ->
+    @type = @file.readString(4)
+    @id = @file.readShort()
+
+    nameLength = Util.pad2(@file.readByte() + 1) - 1
+    @name = @file.readString(nameLength)
+    @length = Util.pad2(@file.readInt())
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lib/psd/resource_section.coffee

+_ = require 'lodash'
+
+module.exports = class ResourceSection
+  RESOURCES = [
+    require('./resources/layer_comps.coffee')
+  ]
+
+  @factory: (resource) ->
+    for Section in RESOURCES
+      continue unless Section::id is resource.id
+      return _.tap new Section(resource), (s) -> s.parse()
+
+    null
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lib/psd/resources.coffee

+Resource = require './resource.coffee'
+
 module.exports = class Resources
   constructor: (@file) ->
     @resources = {}
@@ -10,4 +12,30 @@ module.exports = class Resources
 
   parse: ->
     @length = @file.readInt()
-    @file.seek @length, true
+    finish = @length + @file.tell()
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+
+    while @file.tell() < finish
+      resource = new Resource(@file)
+      resource.parse()
+
+      resourceEnd = @file.tell() + resource.length
+
+      section = Resource.Section.factory(resource)
+      unless section?
+        @file.seek(resourceEnd)
+        continue
+
+      @resources[section.id] = section
+      @typeIndex[section.name] = section.id if section.name?
+
+      @file.seek resourceEnd
+
+    @file.seek finish
+
+  resource: (search) ->
+    if typeof(search) is 'string'
+      @byType(search)
+    else
+      @resources[search]
+
+  byType: (name) -> @resources[@typeIndex[name]]
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lib/psd/resources/layer_comps.coffee

+Descriptor = require '../descriptor.coffee'
+
+module.exports = class LayerComps
+  id: 1065
+  name: 'layerComps'
+
+  @visibilityCaptured: (comp) ->
+    comp.capturedInfo & parseInt('001', 2) > 0
+
+  @positionCaptured: (comp) ->
+    comp.positionCaptured & parseInt('010', 2) > 0
+
+  @appearanceCaptured: (comp) ->
+    comp.appearanceCaptured & parseInt('100', 2) > 0
+
+  constructor: (@resource) ->
+    @file = @resource.file
+
+  parse: ->
+    @file.seek 4, true
+    @data = new Descriptor(@file).parse()
+
+  names: -> @data.list.map (comp) -> comp['Nm  ']
+  export: ->
+    @data.list.map (comp) ->
+      id: comp.compID
+      name: comp['Nm  ']
+      capturedInfo: comp.capturedInfo
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