Layer locking

lib/psd/layer/info.coffee

@@ -8,6 +8,7 @@ LAYER_INFO = {
   gradientFill:           require('../layer_info/gradient_fill.coffee')
   layerId:                require('../layer_info/layer_id.coffee')
   layerNameSource:        require('../layer_info/layer_name_source.coffee')
+  locked:                 require('../layer_info/locked.coffee')
   name:                   require('../layer_info/unicode_name.coffee')
   nestedSectionDivider:   require('../layer_info/nested_section_divider.coffee')
   sectionDivider:         require('../layer_info/section_divider.coffee')

lib/psd/layer_info/locked.coffee

+LayerInfo = require '../layer_info.coffee'
+
+module.exports = class Locked extends LayerInfo
+  @shouldParse: (key) -> key is 'lspf'
+
+  parse: ->
+    locked = @file.readInt()
+
+    @transparencyLocked = (locked & (0x01 << 0)) > 0 || locked == -2147483648
+    @compositeLocked = (locked & (0x01 << 1)) > 0 || locked == -2147483648
+    @positionLocked = (locked & (0x01 << 2)) > 0 || locked == -2147483648
+
+    @allLocked = @transparencyLocked and @compositeLocked and @positionLocked
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