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| r = require 'restructure'
{resolveLength} = require 'restructure/src/utils'
CFFDict = require './CFFDict'
CFFIndex = require './CFFIndex'
CFFPointer = require './CFFPointer'
CFFPrivateDict = require './CFFPrivateDict'
StandardStrings = require './CFFStandardStrings'
{StandardEncoding, ExpertEncoding} = require './CFFEncodings'
{ISOAdobeCharset, ExpertCharset, ExpertSubsetCharset} = require './CFFCharsets';
# Checks if an operand is an index of a predefined value,
# otherwise delegates to the provided type.
class PredefinedOp
constructor: (@predefinedOps, @type) ->
decode: (stream, parent, operands) ->
Iif @predefinedOps[operands[0]]
return @predefinedOps[operands[0]]
return @type.decode(stream, parent, operands)
size: (value, ctx) ->
return @type.size(value, ctx)
encode: (stream, value, ctx) ->
index = @predefinedOps.indexOf(value)
Iif index isnt -1
return index
return @type.encode(stream, value, ctx)
class CFFEncodingVersion extends r.Number
constructor: ->
super 'UInt8'
decode: (stream) ->
return r.uint8.decode(stream) & 0x7f
Range1 = new r.Struct
first: r.uint16
nLeft: r.uint8
Range2 = new r.Struct
first: r.uint16
nLeft: r.uint16
CFFCustomEncoding = new r.VersionedStruct new CFFEncodingVersion,
0:
nCodes: r.uint8
codes: new r.Array(r.uint8, 'nCodes')
1:
nRanges: r.uint8
ranges: new r.Array(Range1, 'nRanges')
# TODO: supplement?
CFFEncoding = new PredefinedOp [ StandardEncoding, ExpertEncoding ], new CFFPointer(CFFCustomEncoding, lazy: true)
# Decodes an array of ranges until the total
# length is equal to the provided length.
class RangeArray extends r.Array
decode: (stream, parent) ->
length = resolveLength @length, stream, parent
count = 0
res = []
while count < length
range = @type.decode(stream, parent)
range.offset = count
count += range.nLeft + 1
res.push range
return res
CFFCustomCharset = new r.VersionedStruct r.uint8,
0:
glyphs: new r.Array(r.uint16, -> @parent.CharStrings.length - 1)
1:
ranges: new RangeArray(Range1, -> @parent.CharStrings.length - 1)
2:
ranges: new RangeArray(Range2, -> @parent.CharStrings.length - 1)
CFFCharset = new PredefinedOp [ ISOAdobeCharset, ExpertCharset, ExpertSubsetCharset ], new CFFPointer(CFFCustomCharset, lazy: true)
FDRange = new r.Struct
first: r.uint16
fd: r.uint8
FDSelect = new r.VersionedStruct r.uint8,
0:
fds: new r.Array(r.uint8, -> @parent.CharStrings.length)
3:
nRanges: r.uint16
ranges: new r.Array(FDRange, 'nRanges')
sentinel: r.uint16
class CFFPrivateOp
ptr = new CFFPointer(CFFPrivateDict)
decode: (stream, parent, operands) ->
parent.length = operands[0]
return ptr.decode(stream, parent, [operands[1]])
size: (dict, ctx) ->
return [CFFPrivateDict.size(dict, ctx, false), ptr.size(dict, ctx)[0]]
encode: (stream, dict, ctx) ->
return [CFFPrivateDict.size(dict, ctx, false), ptr.encode(stream, dict, ctx)[0]]
FontDict = new CFFDict [
# key name type(s) default
[18, 'Private', new CFFPrivateOp, null]
[[12, 38], 'FontName', 'sid', null]
]
CFFTopDict = new CFFDict [
# key name type(s) default
[[12, 30], 'ROS', ['sid', 'sid', 'number'], null]
[0, 'version', 'sid', null]
[1, 'Notice', 'sid', null]
[[12, 0], 'Copyright', 'sid', null]
[2, 'FullName', 'sid', null]
[3, 'FamilyName', 'sid', null]
[4, 'Weight', 'sid', null]
[[12, 1], 'isFixedPitch', 'boolean', false]
[[12, 2], 'ItalicAngle', 'number', 0]
[[12, 3], 'UnderlinePosition', 'number', -100]
[[12, 4], 'UnderlineThickness', 'number', 50]
[[12, 5], 'PaintType', 'number', 0]
[[12, 6], 'CharstringType', 'number', 2]
[[12, 7], 'FontMatrix', 'array', [0.001, 0, 0, 0.001, 0, 0]]
[13, 'UniqueID', 'number', null],
[5, 'FontBBox', 'array', [0, 0, 0, 0]]
[[12, 8], 'StrokeWidth', 'number', 0]
[14, 'XUID', 'array', null]
[15, 'charset', CFFCharset, ISOAdobeCharset]
[16, 'Encoding', CFFEncoding, StandardEncoding]
[17, 'CharStrings', new CFFPointer(new CFFIndex), null]
[18, 'Private', new CFFPrivateOp, null]
[[12, 20], 'SyntheticBase', 'number', null]
[[12, 21], 'PostScript', 'sid', null]
[[12, 22], 'BaseFontName', 'sid', null]
[[12, 23], 'BaseFontBlend', 'delta', null]
# CID font specific
[[12, 31], 'CIDFontVersion', 'number', 0]
[[12, 32], 'CIDFontRevision', 'number', 0]
[[12, 33], 'CIDFontType', 'number', 0]
[[12, 34], 'CIDCount', 'number', 8720]
[[12, 35], 'UIDBase', 'number', null]
[[12, 37], 'FDSelect', new CFFPointer(FDSelect), null]
[[12, 36], 'FDArray', new CFFPointer(new CFFIndex(FontDict)), null]
[[12, 38], 'FontName', 'sid', null]
]
CFFHeader = new r.Struct
majorVersion: r.uint8
minorVersion: r.uint8
hdrSize: r.uint8
offSize: r.uint8
CFFTop = new r.Struct
header: CFFHeader
nameIndex: new CFFIndex(new r.String('length'))
topDictIndex: new CFFIndex(CFFTopDict)
stringIndex: new CFFIndex(new r.String('length'))
globalSubrIndex: new CFFIndex
module.exports = CFFTop
|