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 makeInvalidPadding3():
header, directory, tableData = defaultSFNTTestData()
# shift the offsets for every table after head
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"] += 4
# pad the tables
for tag, data in tableData.items():
if tag == "head":
tableData[tag] = padData(data) + ("\0" * 4)
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 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 makeInvalidPadding4():
header, directory, tableData = defaultSFNTTestData()
entries = [(entry["offset"], entry) for entry in directory]
# pad the tables
for o, entry in sorted(entries):
tag = entry["tag"]
data = tableData[tag]
tableData[tag] = padData(data)
# add four bogus bytes to the last table
entry = sorted(entries)[-1][1]
tag = entry["tag"]
tableData[tag] += "\0" * 4
# compile
data = packSFNT(header, directory, tableData, applyPadding=False)
return data
def makeInvalidPadding4():
header, directory, tableData = defaultSFNTTestData()
entries = [(entry["offset"], entry) for entry in directory]
# pad the tables
for o, entry in sorted(entries):
tag = entry["tag"]
data = tableData[tag]
tableData[tag] = padData(data)
# add four bogus bytes to the last table
entry = sorted(entries)[-1][1]
tag = entry["tag"]
tableData[tag] += "\0" * 4
# compile
data = packSFNT(header, directory, tableData, applyPadding=False)
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 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
