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Add fontTools.ttLib.sfnt.readTTCHeader()

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This commit is contained in:
Behdad Esfahbod 2018-01-22 17:44:59 -08:00
parent 677954d5b9
commit 524b62a1b2
2 changed files with 18 additions and 13 deletions
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3
Lib/fontTools/misc/py23.py
View File

@ -6,7 +6,8 @@ import sys
__all__ = ['basestring', 'unicode', 'unichr', 'byteord', 'bytechr', 'BytesIO',
'StringIO', 'UnicodeIO', 'strjoin', 'bytesjoin', 'tobytes', 'tostr',
'tounicode', 'Tag', 'open', 'range', 'xrange', 'round', 'Py23Error']
'tounicode', 'Tag', 'open', 'range', 'xrange', 'round', 'Py23Error',
'SimpleNamespace']
class Py23Error(NotImplementedError):

28
Lib/fontTools/ttLib/sfnt.py
View File

@ -51,19 +51,11 @@ class SFNTReader(object):
self.sfntVersion = self.file.read(4)
self.file.seek(0)
if self.sfntVersion == b"ttcf":
data = self.file.read(ttcHeaderSize)
if len(data) != ttcHeaderSize:
header = readTTCHeader(self.file)
if not 0 <= fontNumber < header.numFonts:
from fontTools import ttLib
raise ttLib.TTLibError("Not a Font Collection (not enough data)")
sstruct.unpack(ttcHeaderFormat, data, self)
assert self.Version == 0x00010000 or self.Version == 0x00020000, "unrecognized TTC version 0x%08x" % self.Version
if not 0 <= fontNumber < self.numFonts:
from fontTools import ttLib
raise ttLib.TTLibError("specify a font number between 0 and %d (inclusive)" % (self.numFonts - 1))
offsetTable = struct.unpack(">%dL" % self.numFonts, self.file.read(self.numFonts * 4))
if self.Version == 0x00020000:
pass # ignoring version 2.0 signatures
self.file.seek(offsetTable[fontNumber])
raise ttLib.TTLibError("specify a font number between 0 and %d (inclusive)" % (header.numFonts - 1))
self.file.seek(header.offsetTable[fontNumber])
data = self.file.read(sfntDirectorySize)
if len(data) != sfntDirectorySize:
from fontTools import ttLib
@ -566,6 +558,18 @@ def calcChecksum(data):
value = (value + sum(longs)) & 0xffffffff
return value
def readTTCHeader(file):
self = SimpleNamespace()
data = file.read(ttcHeaderSize)
if len(data) != ttcHeaderSize:
from fontTools import ttLib
raise ttLib.TTLibError("Not a Font Collection (not enough data)")
sstruct.unpack(ttcHeaderFormat, data, self)
assert self.Version == 0x00010000 or self.Version == 0x00020000, "unrecognized TTC version 0x%08x" % self.Version
self.offsetTable = struct.unpack(">%dL" % self.numFonts, file.read(self.numFonts * 4))
if self.Version == 0x00020000:
pass # ignoring version 2.0 signatures
return self
if __name__ == "__main__":
import sys