file.coffeelib/psd/ | |
|---|---|
{jspack} = require 'jspack'
iconv = require 'iconv-lite'
Color = require './color.coffee'
Util = require './util.coffee' | |
A file abstraction that stores the PSD file data, and assists in parsing it. | 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
Float:
code: '>f'
length: 4
Double:
code: '>d'
length: 8
LongLong:
code: '>q'
length: 8
for own format, info of FORMATS then do (format, info) =>
@::["read#{format}"] = -> @readf(info.code, info.length)[0] |
The current cursor position in the file. | pos: 0 |
Creates a new File with the given Uint8Array. | constructor: (@data) -> |
Returns the current cursor position. | tell: -> @pos |
Reads raw file data with no processing. | read: (length) -> (@data[@pos++] for i in [0...length]) |
Reads file data and processes it with the given unpack format string. If the length is omitted, then it will be calculated automatically based on the format string. | readf: (format, len = null) -> jspack.Unpack format, @read(len or jspack.CalcLength(format)) |
Moves the cursor without parsing data. If | seek: (amt, rel = false) -> if rel then @pos += amt else @pos = amt |
Reads a String of the given length. | readString: (length) -> String.fromCharCode.apply(null, @read(length)).replace /\u0000/g, "" |
Reads a Unicode UTF-16BE encoded string. | readUnicodeString: (length = null) ->
length or= @readInt()
iconv.decode(new Buffer(@read(length * 2)),'utf-16be').replace /\u0000/g, "" |
Helper that reads a single byte. | readByte: -> @read(1)[0] |
Helper that reads a single byte and interprets it as a boolean. | readBoolean: -> @readByte() isnt 0 |
Reads a 32-bit color space value. | readSpaceColor: ->
colorSpace = @readShort()
colorComponent = (@readShort() >> 8) for i in [0...4]
colorSpace: colorSpace, components: colorComponent |
Adobe's lovely signed 32-bit fixed-point number with 8bits.24bits http://www.adobe.com/devnet-apps/photoshop/fileformatashtml/PhotoshopFileFormats.htm#50577409_17587 | readPathNumber: ->
a = @readByte()
arr = @read(3)
b1 = arr[0] << 16
b2 = arr[1] << 8
b3 = arr[2]
b = b1 | b2 | b3
parseFloat(a, 10) + parseFloat(b / Math.pow(2, 24), 10)
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