Start implementing more file read types

lib/psd/file.coffee

+{jspack} = require('jspack')
+
 module.exports = class File
+  FORMATS =
+    Int:
+      code: '>i'
+      length: 4
+    UInt:
+      code: '>I'
+      length: 4
+    Short:
+      code: '>h'
+      length: 2
+    UShort:
+      code: '>H'
+      length: 2
+
+  for own format, info of FORMATS then do (format, info) =>
+    @::["read#{format}"] = -> @readf(info.code, info.length)[0]
+
   constructor: (@data) ->
     @pos = 0
 
@@ -8,6 +27,8 @@ module.exports = class File
     @pos += length
     return data
 
+  readf: (format, len = null) -> jspack.Unpack format, @read(len or jspack.CalcLength(format))
+
   seek: (amt, rel = false) -> if rel then @pos += amt else @pos = amt
 
   readString: (length) -> @read(length).toString()
\ No newline at end of file

lib/psd/header.coffee

@@ -2,6 +2,7 @@ RSVP = require ('rsvp')
 
 module.exports = class Header
   constructor: (@file) ->
+    @sig = null
     @version = null
     @channels = null
     @rows = null
@@ -11,6 +12,7 @@ module.exports = class Header
 
   parse: ->
     new RSVP.Promise (resolve, reject) =>
-      sig = @file.readString(4)
-      console.log sig
+      @sig = @file.readString(4)
+      @version = @file.readUShort()
+
       resolve(@)
\ No newline at end of file

package.json

@@ -3,7 +3,8 @@
   "version": "0.0.1",
   "dependencies": {
     "coffee-script": "~ 1.7.1",
-    "rsvp": "~ 3.0.6"
+    "rsvp": "~ 3.0.6",
+    "jspack": "~ 0.0.3"
   },
   "devDependencies": {
     "coffeeify": "~ 0.6.0"