S_I_N_G_.py :  » GUI » TTX-FontTools » fonttools-2.3 » Lib » fontTools » ttLib » tables » Python Open Source

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Python Open Source » GUI » TTX FontTools 
TTX FontTools » fonttools 2.3 » Lib » fontTools » ttLib » tables » S_I_N_G_.py
import DefaultTable
import sstruct
import struct
import time
import string
from fontTools.misc.textTools import safeEval,num2binary,binary2num

SINGFormat = """
    >  # big endian
    tableVersionMajor:  H
    tableVersionMinor:   H
    glyphletVersion:  H
    permissions:    h
    mainGID:      H
    unitsPerEm:      H
    vertAdvance:    h
    vertOrigin:      h
    uniqueName:      28s
    METAMD5:      16s
    nameLength:      1s
"""
# baseGlyphName is a byte string which follows the record above.
    


class table_S_I_N_G_(DefaultTable.DefaultTable):
  
  dependencies = []
  
  def decompile(self, data, ttFont):
    dummy, rest = sstruct.unpack2(SINGFormat, data, self)
    self.uniqueName = self.decompileUniqueName(self.uniqueName)
    self.nameLength = ord(self.nameLength)
    assert len(rest) == self.nameLength
    self.baseGlyphName = rest
    
    rawMETAMD5 = self.METAMD5
    self.METAMD5 = "[" + hex(ord(self.METAMD5[0]))
    for char in rawMETAMD5[1:]:
      self.METAMD5 = self.METAMD5 + ", " + hex(ord(char))
    self.METAMD5 = self.METAMD5 + "]"
    
  def decompileUniqueName(self, data):
    name = ""
    for char in data:
      val = ord(char)
      if val == 0:
        break
      if (val > 31) or (val < 128):
        name = name + char
      else:
        octString = oct(val)
        if len(octString) > 3:
          octString = octString[1:] # chop off that leading zero.
        elif len(octString) < 3:
          octString.zfill(3)
        name = name + "\\" + octString
    return name
    
    
  def compile(self, ttFont):
    self.nameLength = chr(len(self.baseGlyphName))
    self.uniqueName = self.compilecompileUniqueName(self.uniqueName, 28)
    METAMD5List = eval(self.METAMD5)
    self.METAMD5 = ""
    for val in METAMD5List:
      self.METAMD5 = self.METAMD5 + chr(val)
    assert (len(self.METAMD5) == 16), "Failed to pack 16 byte MD5 hash in SING table"
    data = sstruct.pack(SINGFormat, self)
    data = data + self.baseGlyphName
    return data
  
  def compilecompileUniqueName(self, name, length):
    nameLen = len(name)
    if length <= nameLen:
      name[:length-1] + "\000"
    else:
      name.join( (nameLen - length)* "\000")
    return name


  def toXML(self, writer, ttFont):
    writer.comment("Most of this table will be recalculated by the compiler")
    writer.newline()
    formatstring, names, fixes = sstruct.getformat(SINGFormat)
    for name in names:
      value = getattr(self, name)
      writer.simpletag(name, value=value)
      writer.newline()
    writer.simpletag("baseGlyphName", value=self.baseGlyphName)
    writer.newline()
    
  def fromXML(self, (name, attrs, content), ttFont):
    value = attrs["value"]
    if name in ["uniqueName", "METAMD5", "baseGlyphName"]:
      setattr(self, name, value)
    else:
      try:
        value = safeEval(value)
      except OverflowError:
        value = long(value)
      setattr(self, name, value)
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