def __init__(self, file, checkChecksums=1):
self.file = file
self.checkChecksums = checkChecksums
data = self.file.read(sfntDirectorySize)
if len(data) <> sfntDirectorySize:
from kiva.fonttools.fontTools import ttLib
raise ttLib.TTLibError, "Not a TrueType or OpenType font (not enough data)"
sstruct.unpack(sfntDirectoryFormat, data, self)
if self.sfntVersion not in ("\000\001\000\000", "OTTO", "true"):
from kiva.fonttools.fontTools import ttLib
raise ttLib.TTLibError, "Not a TrueType or OpenType font (bad sfntVersion)"
self.tables = {}
for i in range(self.numTables):
entry = SFNTDirectoryEntry()
entry.fromFile(self.file)
if entry.length > 0:
self.tables[entry.tag] = entry
else:
# Ignore zero-length tables. This doesn't seem to be documented,
# yet it's apparently how the Windows TT rasterizer behaves.
# Besides, at least one font has been sighted which actually
# *has* a zero-length table.
pass
def fromString(self, str):
sstruct.unpack(sfntDirectoryEntryFormat, str, self)
def fromFile(self, file):
sstruct.unpack(sfntDirectoryEntryFormat,
file.read(sfntDirectoryEntrySize), self)
