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Report error is post table version 2.0 is too small

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This commit is contained in:
Eric Muller 2021-05-26 09:25:09 -07:00
parent bb5d59300c
commit add77ca3f7
1 changed files with 25 additions and 12 deletions
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37
Lib/fontTools/ttLib/tables/_p_o_s_t.py
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@ -87,11 +87,7 @@ class table__p_o_s_t(DefaultTable.DefaultTable):
indices.frombytes(data[:2*numGlyphs])
if sys.byteorder != "big": indices.byteswap()
data = data[2*numGlyphs:]
maxIndex = 0
for i in range(numGlyphs):
if indices[i] > maxIndex: maxIndex = indices [i]
maxIndex = max(indices[:numGlyphs])
self.extraNames = extraNames = unpackPStrings(data, maxIndex-257)
self.glyphOrder = glyphOrder = [""] * int(ttFont['maxp'].numGlyphs)
for glyphID in range(numGlyphs):
@ -259,17 +255,34 @@ class table__p_o_s_t(DefaultTable.DefaultTable):
self.data = readHex(content)
def unpackPStrings(data, nbStrings):
def unpackPStrings(data, n):
# extract n Pascal strings from data.
# if there is not enough data, use ""
strings = []
index = 0
while nbStrings > 0:
length = byteord(data[index])
strings.append(tostr(data[index+1:index+1+length], encoding="latin1"))
index = index + 1 + length
nbStrings = nbStrings - 1
dataLen = len(data)
for _ in range(n):
if (dataLen <= index):
length = 0
else:
length = byteord(data[index])
index += 1
if (dataLen <= index + length - 1):
name = ""
else:
name = tostr(data[index:index+length], encoding="latin1")
strings.append (name)
index += length
if (index < dataLen):
log.warning("%d extra bytes in post.stringData array", dataLen - index)
log.warning("%d extra bytes in post.stringData array", dataLen - index)
elif (dataLen < index):
log.warning("not enough data in post.stringData array")
return strings