fonttools/Tests/ttLib/woff2_test.py

from __future__ import print_function, division, absolute_import, unicode_literals
from fontTools.misc.py23 import *
from fontTools import ttLib
from fontTools.ttLib.woff2 import (
	WOFF2Reader, woff2DirectorySize, woff2DirectoryFormat,
	woff2FlagsSize, woff2UnknownTagSize, woff2Base128MaxSize, WOFF2DirectoryEntry,
	getKnownTagIndex, packBase128, base128Size, woff2UnknownTagIndex,
	WOFF2FlavorData, woff2TransformedTableTags, WOFF2GlyfTable, WOFF2LocaTable,
	WOFF2Writer)
import unittest
from fontTools.misc import sstruct
import os
import random
import copy
from collections import OrderedDict

haveBrotli = False
try:
	import brotli
	haveBrotli = True
except ImportError:
	pass


# Python 3 renamed 'assertRaisesRegexp' to 'assertRaisesRegex', and fires
# deprecation warnings if a program uses the old name.
if not hasattr(unittest.TestCase, 'assertRaisesRegex'):
	unittest.TestCase.assertRaisesRegex = unittest.TestCase.assertRaisesRegexp


current_dir = os.path.abspath(os.path.dirname(os.path.realpath(__file__)))
data_dir = os.path.join(current_dir, 'testdata')
TTX = os.path.join(data_dir, 'TestTTF-Regular.ttx')
OTX = os.path.join(data_dir, 'TestOTF-Regular.otx')
METADATA = os.path.join(data_dir, 'test_woff2_metadata.xml')

TT_WOFF2 = BytesIO()
CFF_WOFF2 = BytesIO()


def setUpModule():
	if not haveBrotli:
		raise unittest.SkipTest("No module named brotli")
	assert os.path.exists(TTX)
	assert os.path.exists(OTX)
	# import TT-flavoured test font and save it as WOFF2
	ttf = ttLib.TTFont(recalcBBoxes=False, recalcTimestamp=False)
	ttf.importXML(TTX)
	ttf.flavor = "woff2"
	ttf.save(TT_WOFF2, reorderTables=None)
	# import CFF-flavoured test font and save it as WOFF2
	otf = ttLib.TTFont(recalcBBoxes=False, recalcTimestamp=False)
	otf.importXML(OTX)
	otf.flavor = "woff2"
	otf.save(CFF_WOFF2, reorderTables=None)


class WOFF2ReaderTest(unittest.TestCase):

	@classmethod
	def setUpClass(cls):
		cls.file = BytesIO(CFF_WOFF2.getvalue())
		cls.font = ttLib.TTFont(recalcBBoxes=False, recalcTimestamp=False)
		cls.font.importXML(OTX)

	def setUp(self):
		self.file.seek(0)

	def test_bad_signature(self):
		with self.assertRaisesRegex(ttLib.TTLibError, 'bad signature'):
			WOFF2Reader(BytesIO(b"wOFF"))

	def test_not_enough_data_header(self):
		incomplete_header = self.file.read(woff2DirectorySize - 1)
		with self.assertRaisesRegex(ttLib.TTLibError, 'not enough data'):
			WOFF2Reader(BytesIO(incomplete_header))

	def test_incorrect_compressed_size(self):
		data = self.file.read(woff2DirectorySize)
		header = sstruct.unpack(woff2DirectoryFormat, data)
		header['totalCompressedSize'] = 0
		data = sstruct.pack(woff2DirectoryFormat, header)
		with self.assertRaises((brotli.error, ttLib.TTLibError)):
			WOFF2Reader(BytesIO(data + self.file.read()))

	def test_incorrect_uncompressed_size(self):
		decompress_backup = brotli.decompress
		brotli.decompress = lambda data: b""  # return empty byte string
		with self.assertRaisesRegex(ttLib.TTLibError, 'unexpected size for decompressed'):
			WOFF2Reader(self.file)
		brotli.decompress = decompress_backup

	def test_incorrect_file_size(self):
		data = self.file.read(woff2DirectorySize)
		header = sstruct.unpack(woff2DirectoryFormat, data)
		header['length'] -= 1
		data = sstruct.pack(woff2DirectoryFormat, header)
		with self.assertRaisesRegex(
				ttLib.TTLibError, "doesn't match the actual file size"):
			WOFF2Reader(BytesIO(data + self.file.read()))

	def test_num_tables(self):
		tags = [t for t in self.font.keys() if t not in ('GlyphOrder', 'DSIG')]
		data = self.file.read(woff2DirectorySize)
		header = sstruct.unpack(woff2DirectoryFormat, data)
		self.assertEqual(header['numTables'], len(tags))

	def test_table_tags(self):
		tags = set([t for t in self.font.keys() if t not in ('GlyphOrder', 'DSIG')])
		reader = WOFF2Reader(self.file)
		self.assertEqual(set(reader.keys()), tags)

	def test_get_normal_tables(self):
		woff2Reader = WOFF2Reader(self.file)
		specialTags = woff2TransformedTableTags + ('head', 'GlyphOrder', 'DSIG')
		for tag in [t for t in self.font.keys() if t not in specialTags]:
			origData = self.font.getTableData(tag)
			decompressedData = woff2Reader[tag]
			self.assertEqual(origData, decompressedData)

	def test_reconstruct_unknown(self):
		reader = WOFF2Reader(self.file)
		with self.assertRaisesRegex(ttLib.TTLibError, 'transform for table .* unknown'):
			reader.reconstructTable('ZZZZ')


class WOFF2ReaderTTFTest(WOFF2ReaderTest):
	""" Tests specific to TT-flavored fonts. """

	@classmethod
	def setUpClass(cls):
		cls.file = BytesIO(TT_WOFF2.getvalue())
		cls.font = ttLib.TTFont(recalcBBoxes=False, recalcTimestamp=False)
		cls.font.importXML(TTX)

	def setUp(self):
		self.file.seek(0)

	def test_reconstruct_glyf(self):
		woff2Reader = WOFF2Reader(self.file)
		reconstructedData = woff2Reader['glyf']
		self.assertEqual(self.font.getTableData('glyf'), reconstructedData)

	def test_reconstruct_loca(self):
		woff2Reader = WOFF2Reader(self.file)
		reconstructedData = woff2Reader['loca']
		self.assertEqual(self.font.getTableData('loca'), reconstructedData)
		self.assertTrue(hasattr(woff2Reader.tables['glyf'], 'data'))

	def test_reconstruct_loca_not_match_orig_size(self):
		reader = WOFF2Reader(self.file)
		reader.tables['loca'].origLength -= 1
		with self.assertRaisesRegex(
				ttLib.TTLibError, "'loca' table doesn't match original size"):
			reader.reconstructTable('loca')


def normalise_table(font, tag, padding=4):
	""" Return normalised table data. Keep 'font' instance unmodified. """
	assert tag in ('glyf', 'loca', 'head')
	assert tag in font
	if tag == 'head':
		origHeadFlags = font['head'].flags
		font['head'].flags |= (1 << 11)
		tableData = font['head'].compile(font)
	if font.sfntVersion in ("\x00\x01\x00\x00", "true"):
		assert {'glyf', 'loca', 'head'}.issubset(font.keys())
		origIndexFormat = font['head'].indexToLocFormat
		if hasattr(font['loca'], 'locations'):
			origLocations = font['loca'].locations[:]
		else:
			origLocations = []
		glyfTable = ttLib.newTable('glyf')
		glyfTable.decompile(font.getTableData('glyf'), font)
		glyfTable.padding = padding
		if tag == 'glyf':
			tableData = glyfTable.compile(font)
		elif tag == 'loca':
			glyfTable.compile(font)
			tableData = font['loca'].compile(font)
		if tag == 'head':
			glyfTable.compile(font)
			font['loca'].compile(font)
			tableData = font['head'].compile(font)
		font['head'].indexToLocFormat = origIndexFormat
		font['loca'].set(origLocations)
	if tag == 'head':
		font['head'].flags = origHeadFlags
	return tableData


def normalise_font(font, padding=4):
	""" Return normalised font data. Keep 'font' instance unmodified. """
	# drop DSIG but keep a copy
	DSIG_copy = copy.deepcopy(font['DSIG'])
	del font['DSIG']
	# ovverride TTFont attributes
	origFlavor = font.flavor
	origRecalcBBoxes = font.recalcBBoxes
	origRecalcTimestamp = font.recalcTimestamp
	origLazy = font.lazy
	font.flavor = None
	font.recalcBBoxes = False
	font.recalcTimestamp = False
	font.lazy = True
	# save font to temporary stream
	infile = BytesIO()
	font.save(infile)
	infile.seek(0)
	# reorder tables alphabetically
	outfile = BytesIO()
	reader = ttLib.sfnt.SFNTReader(infile)
	writer = ttLib.sfnt.SFNTWriter(
		outfile, len(reader.tables), reader.sfntVersion, reader.flavor, reader.flavorData)
	for tag in sorted(reader.keys()):
		if tag in woff2TransformedTableTags + ('head',):
			writer[tag] = normalise_table(font, tag, padding)
		else:
			writer[tag] = reader[tag]
	writer.close()
	# restore font attributes
	font['DSIG'] = DSIG_copy
	font.flavor = origFlavor
	font.recalcBBoxes = origRecalcBBoxes
	font.recalcTimestamp = origRecalcTimestamp
	font.lazy = origLazy
	return outfile.getvalue()


class WOFF2DirectoryEntryTest(unittest.TestCase):

	def setUp(self):
		self.entry = WOFF2DirectoryEntry()

	def test_not_enough_data_table_flags(self):
		with self.assertRaisesRegex(ttLib.TTLibError, "can't read table 'flags'"):
			self.entry.fromString(b"")

	def test_not_enough_data_table_tag(self):
		incompleteData = bytearray([0x3F, 0, 0, 0])
		with self.assertRaisesRegex(ttLib.TTLibError, "can't read table 'tag'"):
			self.entry.fromString(bytes(incompleteData))

	def test_table_reserved_flags(self):
		with self.assertRaisesRegex(ttLib.TTLibError, "bits 6-7 are reserved"):
			self.entry.fromString(bytechr(0xC0))

	def test_loca_zero_transformLength(self):
		data = bytechr(getKnownTagIndex('loca'))  # flags
		data += packBase128(random.randint(1, 100))  # origLength
		data += packBase128(1)  # non-zero transformLength
		with self.assertRaisesRegex(
				ttLib.TTLibError, "transformLength of the 'loca' table must be 0"):
			self.entry.fromString(data)

	def test_fromFile(self):
		unknownTag = Tag('ZZZZ')
		data = bytechr(getKnownTagIndex(unknownTag))
		data += unknownTag.tobytes()
		data += packBase128(random.randint(1, 100))
		expectedPos = len(data)
		f = BytesIO(data + b'\0'*100)
		self.entry.fromFile(f)
		self.assertEqual(f.tell(), expectedPos)

	def test_transformed_toString(self):
		self.entry.tag = Tag('glyf')
		self.entry.flags = getKnownTagIndex(self.entry.tag)
		self.entry.origLength = random.randint(101, 200)
		self.entry.length = random.randint(1, 100)
		expectedSize = (woff2FlagsSize + base128Size(self.entry.origLength) +
			base128Size(self.entry.length))
		data = self.entry.toString()
		self.assertEqual(len(data), expectedSize)

	def test_known_toString(self):
		self.entry.tag = Tag('head')
		self.entry.flags = getKnownTagIndex(self.entry.tag)
		self.entry.origLength = 54
		expectedSize = (woff2FlagsSize + base128Size(self.entry.origLength))
		data = self.entry.toString()
		self.assertEqual(len(data), expectedSize)

	def test_unknown_toString(self):
		self.entry.tag = Tag('ZZZZ')
		self.entry.flags = woff2UnknownTagIndex
		self.entry.origLength = random.randint(1, 100)
		expectedSize = (woff2FlagsSize + woff2UnknownTagSize +
			base128Size(self.entry.origLength))
		data = self.entry.toString()
		self.assertEqual(len(data), expectedSize)


class DummyReader(WOFF2Reader):

	def __init__(self, file, checkChecksums=1, fontNumber=-1):
		self.file = file
		for attr in ('majorVersion', 'minorVersion', 'metaOffset', 'metaLength',
				'metaOrigLength', 'privLength', 'privOffset'):
			setattr(self, attr, 0)


class WOFF2FlavorDataTest(unittest.TestCase):

	@classmethod
	def setUpClass(cls):
		assert os.path.exists(METADATA)
		with open(METADATA, 'rb') as f:
			cls.xml_metadata = f.read()
		cls.compressed_metadata = brotli.compress(cls.xml_metadata, mode=brotli.MODE_TEXT)
		# make random byte strings; font data must be 4-byte aligned
		cls.fontdata = bytes(bytearray(random.sample(range(0, 256), 80)))
		cls.privData = bytes(bytearray(random.sample(range(0, 256), 20)))

	def setUp(self):
		self.file = BytesIO(self.fontdata)
		self.file.seek(0, 2)

	def test_get_metaData_no_privData(self):
		self.file.write(self.compressed_metadata)
		reader = DummyReader(self.file)
		reader.metaOffset = len(self.fontdata)
		reader.metaLength = len(self.compressed_metadata)
		reader.metaOrigLength = len(self.xml_metadata)
		flavorData = WOFF2FlavorData(reader)
		self.assertEqual(self.xml_metadata, flavorData.metaData)

	def test_get_privData_no_metaData(self):
		self.file.write(self.privData)
		reader = DummyReader(self.file)
		reader.privOffset = len(self.fontdata)
		reader.privLength = len(self.privData)
		flavorData = WOFF2FlavorData(reader)
		self.assertEqual(self.privData, flavorData.privData)

	def test_get_metaData_and_privData(self):
		self.file.write(self.compressed_metadata + self.privData)
		reader = DummyReader(self.file)
		reader.metaOffset = len(self.fontdata)
		reader.metaLength = len(self.compressed_metadata)
		reader.metaOrigLength = len(self.xml_metadata)
		reader.privOffset = reader.metaOffset + reader.metaLength
		reader.privLength = len(self.privData)
		flavorData = WOFF2FlavorData(reader)
		self.assertEqual(self.xml_metadata, flavorData.metaData)
		self.assertEqual(self.privData, flavorData.privData)

	def test_get_major_minorVersion(self):
		reader = DummyReader(self.file)
		reader.majorVersion = reader.minorVersion = 1
		flavorData = WOFF2FlavorData(reader)
		self.assertEqual(flavorData.majorVersion, 1)
		self.assertEqual(flavorData.minorVersion, 1)


class WOFF2WriterTest(unittest.TestCase):

	@classmethod
	def setUpClass(cls):
		cls.font = ttLib.TTFont(recalcBBoxes=False, recalcTimestamp=False, flavor="woff2")
		cls.font.importXML(OTX)
		cls.tags = [t for t in cls.font.keys() if t != 'GlyphOrder']
		cls.numTables = len(cls.tags)
		cls.file = BytesIO(CFF_WOFF2.getvalue())
		cls.file.seek(0, 2)
		cls.length = (cls.file.tell() + 3) & ~3
		cls.setUpFlavorData()

	@classmethod
	def setUpFlavorData(cls):
		assert os.path.exists(METADATA)
		with open(METADATA, 'rb') as f:
			cls.xml_metadata = f.read()
		cls.compressed_metadata = brotli.compress(cls.xml_metadata, mode=brotli.MODE_TEXT)
		cls.privData = bytes(bytearray(random.sample(range(0, 256), 20)))

	def setUp(self):
		self.file.seek(0)
		self.writer = WOFF2Writer(BytesIO(), self.numTables, self.font.sfntVersion)

	def test_DSIG_dropped(self):
		self.writer['DSIG'] = b"\0"
		self.assertEqual(len(self.writer.tables), 0)
		self.assertEqual(self.writer.numTables, self.numTables-1)

	def test_no_rewrite_table(self):
		self.writer['ZZZZ'] = b"\0"
		with self.assertRaisesRegex(ttLib.TTLibError, "cannot rewrite"):
			self.writer['ZZZZ'] = b"\0"

	def test_num_tables(self):
		self.writer['ABCD'] = b"\0"
		with self.assertRaisesRegex(ttLib.TTLibError, "wrong number of tables"):
			self.writer.close()

	def test_required_tables(self):
		font = ttLib.TTFont(flavor="woff2")
		with self.assertRaisesRegex(ttLib.TTLibError, "missing required table"):
			font.save(BytesIO())

	def test_head_transform_flag(self):
		headData = self.font.getTableData('head')
		origFlags = byteord(headData[16])
		woff2font = ttLib.TTFont(self.file)
		newHeadData = woff2font.getTableData('head')
		modifiedFlags = byteord(newHeadData[16])
		self.assertNotEqual(origFlags, modifiedFlags)
		restoredFlags = modifiedFlags & ~0x08  # turn off bit 11
		self.assertEqual(origFlags, restoredFlags)

	def test_tables_sorted_alphabetically(self):
		expected = sorted([t for t in self.tags if t != 'DSIG'])
		woff2font = ttLib.TTFont(self.file)
		self.assertEqual(expected, list(woff2font.reader.keys()))

	def test_checksums(self):
		normFile = BytesIO(normalise_font(self.font, padding=4))
		normFile.seek(0)
		normFont = ttLib.TTFont(normFile, checkChecksums=2)
		w2font = ttLib.TTFont(self.file)
		# force reconstructing glyf table using 4-byte padding
		w2font.reader.padding = 4
		for tag in [t for t in self.tags if t != 'DSIG']:
			w2data = w2font.reader[tag]
			normData = normFont.reader[tag]
			if tag == "head":
				w2data = w2data[:8] + b'\0\0\0\0' + w2data[12:]
				normData = normData[:8] + b'\0\0\0\0' + normData[12:]
			w2CheckSum = ttLib.sfnt.calcChecksum(w2data)
			normCheckSum = ttLib.sfnt.calcChecksum(normData)
			self.assertEqual(w2CheckSum, normCheckSum)
		normCheckSumAdjustment = normFont['head'].checkSumAdjustment
		self.assertEqual(normCheckSumAdjustment, w2font['head'].checkSumAdjustment)

	def test_calcSFNTChecksumsLengthsAndOffsets(self):
		normFont = ttLib.TTFont(BytesIO(normalise_font(self.font, padding=4)))
		for tag in self.tags:
			self.writer[tag] = self.font.getTableData(tag)
		self.writer._normaliseGlyfAndLoca(padding=4)
		self.writer._setHeadTransformFlag()
		self.writer.tables = OrderedDict(sorted(self.writer.tables.items()))
		self.writer._calcSFNTChecksumsLengthsAndOffsets()
		for tag, entry in normFont.reader.tables.items():
			self.assertEqual(entry.offset, self.writer.tables[tag].origOffset)
			self.assertEqual(entry.length, self.writer.tables[tag].origLength)
			self.assertEqual(entry.checkSum, self.writer.tables[tag].checkSum)

	def test_bad_sfntVersion(self):
		for i in range(self.numTables):
			self.writer[bytechr(65 + i)*4] = b"\0"
		self.writer.sfntVersion = 'ZZZZ'
		with self.assertRaisesRegex(ttLib.TTLibError, "bad sfntVersion"):
			self.writer.close()

	def test_calcTotalSize_no_flavorData(self):
		expected = self.length
		self.writer.file = BytesIO()
		for tag in self.tags:
			self.writer[tag] = self.font.getTableData(tag)
		self.writer.close()
		self.assertEqual(expected, self.writer.length)
		self.assertEqual(expected, self.writer.file.tell())

	def test_calcTotalSize_with_metaData(self):
		expected = self.length + len(self.compressed_metadata)
		flavorData = self.writer.flavorData = WOFF2FlavorData()
		flavorData.metaData = self.xml_metadata
		self.writer.file = BytesIO()
		for tag in self.tags:
			self.writer[tag] = self.font.getTableData(tag)
		self.writer.close()
		self.assertEqual(expected, self.writer.length)
		self.assertEqual(expected, self.writer.file.tell())

	def test_calcTotalSize_with_privData(self):
		expected = self.length + len(self.privData)
		flavorData = self.writer.flavorData = WOFF2FlavorData()
		flavorData.privData = self.privData
		self.writer.file = BytesIO()
		for tag in self.tags:
			self.writer[tag] = self.font.getTableData(tag)
		self.writer.close()
		self.assertEqual(expected, self.writer.length)
		self.assertEqual(expected, self.writer.file.tell())

	def test_calcTotalSize_with_metaData_and_privData(self):
		metaDataLength = (len(self.compressed_metadata) + 3) & ~3
		expected = self.length + metaDataLength + len(self.privData)
		flavorData = self.writer.flavorData = WOFF2FlavorData()
		flavorData.metaData = self.xml_metadata
		flavorData.privData = self.privData
		self.writer.file = BytesIO()
		for tag in self.tags:
			self.writer[tag] = self.font.getTableData(tag)
		self.writer.close()
		self.assertEqual(expected, self.writer.length)
		self.assertEqual(expected, self.writer.file.tell())

	def test_getVersion(self):
		# no version
		self.assertEqual((0, 0), self.writer._getVersion())
		# version from head.fontRevision
		fontRevision = self.font['head'].fontRevision
		versionTuple = tuple(int(i) for i in str(fontRevision).split("."))
		entry = self.writer.tables['head'] = ttLib.newTable('head')
		entry.data = self.font.getTableData('head')
		self.assertEqual(versionTuple, self.writer._getVersion())
		# version from writer.flavorData
		flavorData = self.writer.flavorData = WOFF2FlavorData()
		flavorData.majorVersion, flavorData.minorVersion = (10, 11)
		self.assertEqual((10, 11), self.writer._getVersion())


class WOFF2WriterTTFTest(WOFF2WriterTest):

	@classmethod
	def setUpClass(cls):
		cls.font = ttLib.TTFont(recalcBBoxes=False, recalcTimestamp=False, flavor="woff2")
		cls.font.importXML(TTX)
		cls.tags = [t for t in cls.font.keys() if t != 'GlyphOrder']
		cls.numTables = len(cls.tags)
		cls.file = BytesIO(TT_WOFF2.getvalue())
		cls.file.seek(0, 2)
		cls.length = (cls.file.tell() + 3) & ~3
		cls.setUpFlavorData()

	def test_normaliseGlyfAndLoca(self):
		normTables = {}
		for tag in ('head', 'loca', 'glyf'):
			normTables[tag] = normalise_table(self.font, tag, padding=4)
		for tag in self.tags:
			tableData = self.font.getTableData(tag)
			self.writer[tag] = tableData
			if tag in normTables:
				self.assertNotEqual(tableData, normTables[tag])
		self.writer._normaliseGlyfAndLoca(padding=4)
		self.writer._setHeadTransformFlag()
		for tag in normTables:
			self.assertEqual(self.writer.tables[tag].data, normTables[tag])


class WOFF2LocaTableTest(unittest.TestCase):

	def setUp(self):
		self.font = font = ttLib.TTFont(recalcBBoxes=False, recalcTimestamp=False)
		font['head'] = ttLib.newTable('head')
		font['loca'] = WOFF2LocaTable()
		font['glyf'] = WOFF2GlyfTable()

	def test_compile_short_loca(self):
		locaTable = self.font['loca']
		locaTable.set(list(range(0, 0x20000, 2)))
		self.font['glyf'].indexFormat = 0
		locaData = locaTable.compile(self.font)
		self.assertEqual(len(locaData), 0x20000)

	def test_compile_short_loca_overflow(self):
		locaTable = self.font['loca']
		locaTable.set(list(range(0x20000 + 1)))
		self.font['glyf'].indexFormat = 0
		with self.assertRaisesRegex(
				ttLib.TTLibError, "indexFormat is 0 but local offsets > 0x20000"):
			locaTable.compile(self.font)

	def test_compile_short_loca_not_multiples_of_2(self):
		locaTable = self.font['loca']
		locaTable.set([1, 3, 5, 7])
		self.font['glyf'].indexFormat = 0
		with self.assertRaisesRegex(ttLib.TTLibError, "offsets not multiples of 2"):
			locaTable.compile(self.font)

	def test_compile_long_loca(self):
		locaTable = self.font['loca']
		locaTable.set(list(range(0x20001)))
		self.font['glyf'].indexFormat = 1
		locaData = locaTable.compile(self.font)
		self.assertEqual(len(locaData), 0x20001 * 4)

	def test_compile_set_indexToLocFormat_0(self):
		locaTable = self.font['loca']
		# offsets are all multiples of 2 and max length is < 0x10000
		locaTable.set(list(range(0, 0x20000, 2)))
		locaTable.compile(self.font)
		newIndexFormat = self.font['head'].indexToLocFormat
		self.assertEqual(0, newIndexFormat)

	def test_compile_set_indexToLocFormat_1(self):
		locaTable = self.font['loca']
		# offsets are not multiples of 2
		locaTable.set(list(range(10)))
		locaTable.compile(self.font)
		newIndexFormat = self.font['head'].indexToLocFormat
		self.assertEqual(1, newIndexFormat)
		# max length is >= 0x10000
		locaTable.set(list(range(0, 0x20000 + 1, 2)))
		locaTable.compile(self.font)
		newIndexFormat = self.font['head'].indexToLocFormat
		self.assertEqual(1, newIndexFormat)


class WOFF2GlyfTableTest(unittest.TestCase):

	@classmethod
	def setUpClass(cls):
		font = ttLib.TTFont(recalcBBoxes=False, recalcTimestamp=False)
		font.importXML(TTX)
		cls.tables = {}
		cls.transformedTags = ('maxp', 'head', 'loca', 'glyf')
		for tag in reversed(cls.transformedTags):  # compile in inverse order
			cls.tables[tag] = font.getTableData(tag)
		infile = BytesIO(TT_WOFF2.getvalue())
		reader = WOFF2Reader(infile)
		cls.transformedGlyfData = reader.tables['glyf'].loadData(
			reader.transformBuffer)
		cls.glyphOrder = ['.notdef'] + ["glyph%.5d" % i for i in range(1, font['maxp'].numGlyphs)]

	def setUp(self):
		self.font = font = ttLib.TTFont(recalcBBoxes=False, recalcTimestamp=False)
		font.setGlyphOrder(self.glyphOrder)
		font['head'] = ttLib.newTable('head')
		font['maxp'] = ttLib.newTable('maxp')
		font['loca'] = WOFF2LocaTable()
		font['glyf'] = WOFF2GlyfTable()
		for tag in self.transformedTags:
			font[tag].decompile(self.tables[tag], font)

	def test_reconstruct_glyf_padded_4(self):
		glyfTable = WOFF2GlyfTable()
		glyfTable.reconstruct(self.transformedGlyfData, self.font)
		glyfTable.padding = 4
		data = glyfTable.compile(self.font)
		normGlyfData = normalise_table(self.font, 'glyf', glyfTable.padding)
		self.assertEqual(normGlyfData, data)

	def test_reconstruct_glyf_padded_2(self):
		glyfTable = WOFF2GlyfTable()
		glyfTable.reconstruct(self.transformedGlyfData, self.font)
		glyfTable.padding = 2
		data = glyfTable.compile(self.font)
		normGlyfData = normalise_table(self.font, 'glyf', glyfTable.padding)
		self.assertEqual(normGlyfData, data)

	def test_reconstruct_glyf_unpadded(self):
		glyfTable = WOFF2GlyfTable()
		glyfTable.reconstruct(self.transformedGlyfData, self.font)
		data = glyfTable.compile(self.font)
		self.assertEqual(self.tables['glyf'], data)

	def test_reconstruct_glyf_incorrect_glyphOrder(self):
		glyfTable = WOFF2GlyfTable()
		badGlyphOrder = self.font.getGlyphOrder()[:-1]
		self.font.setGlyphOrder(badGlyphOrder)
		with self.assertRaisesRegex(ttLib.TTLibError, "incorrect glyphOrder"):
			glyfTable.reconstruct(self.transformedGlyfData, self.font)

	def test_reconstruct_glyf_missing_glyphOrder(self):
		glyfTable = WOFF2GlyfTable()
		del self.font.glyphOrder
		numGlyphs = self.font['maxp'].numGlyphs
		del self.font['maxp']
		glyfTable.reconstruct(self.transformedGlyfData, self.font)
		expected = [".notdef"]
		expected.extend(["glyph%.5d" % i for i in range(1, numGlyphs)])
		self.assertEqual(expected, glyfTable.glyphOrder)

	def test_reconstruct_loca_padded_4(self):
		locaTable = self.font['loca'] = WOFF2LocaTable()
		glyfTable = self.font['glyf'] = WOFF2GlyfTable()
		glyfTable.reconstruct(self.transformedGlyfData, self.font)
		glyfTable.padding = 4
		glyfTable.compile(self.font)
		data = locaTable.compile(self.font)
		normLocaData = normalise_table(self.font, 'loca', glyfTable.padding)
		self.assertEqual(normLocaData, data)

	def test_reconstruct_loca_padded_2(self):
		locaTable = self.font['loca'] = WOFF2LocaTable()
		glyfTable = self.font['glyf'] = WOFF2GlyfTable()
		glyfTable.reconstruct(self.transformedGlyfData, self.font)
		glyfTable.padding = 2
		glyfTable.compile(self.font)
		data = locaTable.compile(self.font)
		normLocaData = normalise_table(self.font, 'loca', glyfTable.padding)
		self.assertEqual(normLocaData, data)

	def test_reconstruct_loca_unpadded(self):
		locaTable = self.font['loca'] = WOFF2LocaTable()
		glyfTable = self.font['glyf'] = WOFF2GlyfTable()
		glyfTable.reconstruct(self.transformedGlyfData, self.font)
		glyfTable.compile(self.font)
		data = locaTable.compile(self.font)
		self.assertEqual(self.tables['loca'], data)

	def test_reconstruct_glyf_header_not_enough_data(self):
		with self.assertRaisesRegex(ttLib.TTLibError, "not enough 'glyf' data"):
			WOFF2GlyfTable().reconstruct(b"", self.font)

	def test_reconstruct_glyf_table_incorrect_size(self):
		msg = "incorrect size of transformed 'glyf'"
		with self.assertRaisesRegex(ttLib.TTLibError, msg):
			WOFF2GlyfTable().reconstruct(self.transformedGlyfData + b"\x00", self.font)
		with self.assertRaisesRegex(ttLib.TTLibError, msg):
			WOFF2GlyfTable().reconstruct(self.transformedGlyfData[:-1], self.font)

	def test_transform_glyf(self):
		glyfTable = self.font['glyf']
		data = glyfTable.transform(self.font)
		self.assertEqual(self.transformedGlyfData, data)

	def test_transform_glyf_incorrect_glyphOrder(self):
		glyfTable = self.font['glyf']
		badGlyphOrder = self.font.getGlyphOrder()[:-1]
		del glyfTable.glyphOrder
		self.font.setGlyphOrder(badGlyphOrder)
		with self.assertRaisesRegex(ttLib.TTLibError, "incorrect glyphOrder"):
			glyfTable.transform(self.font)
		glyfTable.glyphOrder = badGlyphOrder
		with self.assertRaisesRegex(ttLib.TTLibError, "incorrect glyphOrder"):
			glyfTable.transform(self.font)

	def test_transform_glyf_missing_glyphOrder(self):
		glyfTable = self.font['glyf']
		del glyfTable.glyphOrder
		del self.font.glyphOrder
		numGlyphs = self.font['maxp'].numGlyphs
		del self.font['maxp']
		glyfTable.transform(self.font)
		expected = [".notdef"]
		expected.extend(["glyph%.5d" % i for i in range(1, numGlyphs)])
		self.assertEqual(expected, glyfTable.glyphOrder)

	def test_roundtrip_glyf_reconstruct_and_transform(self):
		glyfTable = WOFF2GlyfTable()
		glyfTable.reconstruct(self.transformedGlyfData, self.font)
		data = glyfTable.transform(self.font)
		self.assertEqual(self.transformedGlyfData, data)

	def test_roundtrip_glyf_transform_and_reconstruct(self):
		glyfTable = self.font['glyf']
		transformedData = glyfTable.transform(self.font)
		newGlyfTable = WOFF2GlyfTable()
		newGlyfTable.reconstruct(transformedData, self.font)
		newGlyfTable.padding = 4
		reconstructedData = newGlyfTable.compile(self.font)
		normGlyfData = normalise_table(self.font, 'glyf', newGlyfTable.padding)
		self.assertEqual(normGlyfData, reconstructedData)


if __name__ == "__main__":
	import sys
	sys.exit(unittest.main())