def makeInvalidPadding5():
header, directory, tableData = defaultSFNTTestData()
# pad the tables
for tag, data in tableData.items():
if tag == "head":
assert calcPaddingLength(len(data))
tableData[tag] = data + ("\x01" * calcPaddingLength(len(data)))
else:
tableData[tag] = padData(data)
# compile
data = packSFNT(header, directory, tableData, applyPadding=False)
return data
def makeInvalidPadding5():
header, directory, tableData = defaultSFNTTestData()
# pad the tables
for tag, data in tableData.items():
if tag == "head":
assert calcPaddingLength(len(data))
tableData[tag] = data + ("\x01" * calcPaddingLength(len(data)))
else:
tableData[tag] = padData(data)
# compile
data = packSFNT(header, directory, tableData, applyPadding=False)
return data
def makeBitwiseIdenticalNonStandardTable1():
header, directory, tableData = defaultSFNTTestData()
# adjust the header
header["numTables"] += 1
# store the data
data = "\0" * 4
tableData["TEST"] = data
# offset the directory entries
for entry in directory:
entry["offset"] += sfntDirectoryEntrySize
# find the offset
entries = [(entry["offset"], entry) for entry in directory]
entry = max(entries)[1]
offset = entry["offset"] + entry["length"]
offset += calcPaddingLength(offset)
# make the entry
directory.append(
dict(
tag="TEST",
offset=offset,
length=4,
checksum=calcTableChecksum("TEST", data)
)
)
# compile
data = packSFNT(header, directory, tableData)
return data
def makeInvalidPadding2():
header, directory, tableData = defaultSFNTTestData()
# pad the tables and update their offsets
entries = [(entry["offset"], entry) for entry in directory]
for o, entry in sorted(entries):
tag = entry["tag"]
data = tableData[tag]
tableData[tag] = padData(data)
entry["offset"] += sfntDirectoryEntrySize
# make a bogus table and insert it
header["numTables"] += 1
data = "\01" * 15
tableData["zzzz"] = data
offset = entry["offset"] + entry["length"] + calcPaddingLength(entry["length"])
directory.append(
dict(
tag="zzzz",
offset=offset,
length=15,
checksum=calcTableChecksum("zzzz", data)
)
)
# compile
data = packSFNT(header, directory, tableData, applyPadding=False)
return data
def makeDSIG(flavor="CFF"):
header, directory, tableData = defaultSFNTTestData(flavor=flavor)
# adjust the header
header["numTables"] += 1
# store the data
data = "\0" * 4
tableData["DSIG"] = data
# offset the directory entries
for entry in directory:
entry["offset"] += sfntDirectoryEntrySize
# find the offset
entries = [(entry["offset"], entry) for entry in directory]
entry = max(entries)[1]
offset = entry["offset"] + entry["length"]
offset += calcPaddingLength(offset)
# make the entry
directory.append(
dict(
tag="DSIG",
offset=offset,
length=4,
checksum=calcTableChecksum("DSIG", data)
)
)
# compile
data = packSFNT(header, directory, tableData, flavor=flavor)
return data
def makeInvalidPadding1():
header, directory, tableData = defaultSFNTTestData()
# grab the head table, calculate the padding length
# and shift the following tables
headEntry = [entry for entry in directory if entry["tag"] == "head"][0]
shift = calcPaddingLength(headEntry["length"])
assert shift
entries = [(entry["offset"], entry) for entry in directory]
assert sorted(entries)[0][1]["tag"] == "head"
for o, entry in sorted(entries)[1:]:
if entry["tag"] == "head":
continue
entry["offset"] -= shift
# pad the tables
for tag, data in tableData.items():
if tag == "head":
continue
tableData[tag] = padData(data)
# compile
data = packSFNT(header, directory, tableData, applyPadding=False)
return data
def makeBitwiseIdenticalNotRecommendedTableOrder2():
header, directory, tableData = defaultSFNTTestData()
# make the new order
newOrder = "fpgm,LTSH,glyf,cmap,hhea,hmtx,PCLT,post,DSIG,maxp,loca,gasp,VDMX,kern,name,hdmx,prep,OS/2,cvt ,head".split(",")
newOrder = [tag for tag in newOrder if tag in tableData]
for tag in sorted(tableData.keys()):
if tag not in newOrder:
newOrder.append(tag)
# reset the offsets
directoryDict = {}
for entry in directory:
directoryDict[entry["tag"]] = entry
assert set(newOrder) == set(directoryDict.keys())
offset = sfntDirectorySize + (sfntDirectoryEntrySize * len(directory))
for tag in newOrder:
entry = directoryDict[tag]
entry["offset"] = offset
offset += entry["length"] + calcPaddingLength(entry["length"])
directory = [entry for tag, entry in sorted(directoryDict.items())]
# compile
data = packSFNT(header, directory, tableData)
return data
def makeBitwiseIdenticalNotRecommendedTableOrder1():
header, directory, tableData = defaultSFNTTestData(flavor="TTF")
# make the new order
newOrder = "CFF ,maxp,hhea,name,post,cmap,OS/2,head".split(",")
newOrder = [tag for tag in newOrder if tag in tableData]
for tag in sorted(tableData.keys()):
if tag not in newOrder:
newOrder.append(tag)
# reset the offsets
directoryDict = {}
for entry in directory:
directoryDict[entry["tag"]] = entry
assert set(newOrder) == set(directoryDict.keys())
offset = sfntDirectorySize + (sfntDirectoryEntrySize * len(directory))
for tag in newOrder:
entry = directoryDict[tag]
entry["offset"] = offset
offset += entry["length"] + calcPaddingLength(entry["length"])
directory = [entry for tag, entry in sorted(directoryDict.items())]
# compile
data = packSFNT(header, directory, tableData)
return data
def makeInvalidPadding2():
header, directory, tableData = defaultSFNTTestData()
# pad the tables and update their offsets
entries = [(entry["offset"], entry) for entry in directory]
for o, entry in sorted(entries):
tag = entry["tag"]
data = tableData[tag]
tableData[tag] = padData(data)
entry["offset"] += sfntDirectoryEntrySize
# make a bogus table and insert it
header["numTables"] += 1
data = "\01" * 15
tableData["zzzz"] = data
offset = entry["offset"] + entry["length"] + calcPaddingLength(
entry["length"])
directory.append(
dict(tag="zzzz",
offset=offset,
length=15,
checksum=calcTableChecksum("zzzz", data)))
# compile
data = packSFNT(header, directory, tableData, applyPadding=False)
return data
def makeBitwiseIdenticalNonStandardTable1():
header, directory, tableData = defaultSFNTTestData()
# adjust the header
header["numTables"] += 1
# store the data
data = "\0" * 4
tableData["TEST"] = data
# offset the directory entries
for entry in directory:
entry["offset"] += sfntDirectoryEntrySize
# find the offset
entries = [(entry["offset"], entry) for entry in directory]
entry = max(entries)[1]
offset = entry["offset"] + entry["length"]
offset += calcPaddingLength(offset)
# make the entry
directory.append(
dict(tag="TEST",
offset=offset,
length=4,
checksum=calcTableChecksum("TEST", data)))
# compile
data = packSFNT(header, directory, tableData)
return data
