def makeStream(self):
"Finishes the generation and returns the TTF file as a string"
stm = getBytesIO()
write = stm.write
tables = self.tables
numTables = len(tables)
searchRange = 1
entrySelector = 0
while searchRange * 2 <= numTables:
searchRange = searchRange * 2
entrySelector = entrySelector + 1
searchRange = searchRange * 16
rangeShift = numTables * 16 - searchRange
# Header
write(
pack(">lHHHH", 0x00010000, numTables, searchRange, entrySelector,
rangeShift))
# Table directory
offset = 12 + numTables * 16
wStr = (lambda x: write(bytes(tag, 'latin1'))) if isPy3 else write
tables_items = list(sorted(tables.items()))
for tag, data in tables_items:
if tag == 'head':
head_start = offset
checksum = calcChecksum(data)
wStr(tag)
write(pack(">LLL", checksum, offset, len(data)))
paddedLength = (len(data) + 3) & ~3
offset = offset + paddedLength
# Table data
for tag, data in tables_items:
data += b"\0\0\0"
write(data[:len(data) & ~3])
checksum = calcChecksum(stm.getvalue())
checksum = add32(0xB1B0AFBA, -checksum)
stm.seek(head_start + 8)
write(pack('>L', checksum))
return stm.getvalue()
def makeStream(self):
"Finishes the generation and returns the TTF file as a string"
stm = getBytesIO()
write = stm.write
tables = self.tables
numTables = len(tables)
searchRange = 1
entrySelector = 0
while searchRange * 2 <= numTables:
searchRange = searchRange * 2
entrySelector = entrySelector + 1
searchRange = searchRange * 16
rangeShift = numTables * 16 - searchRange
# Header
write(pack(">lHHHH", 0x00010000, numTables, searchRange,
entrySelector, rangeShift))
# Table directory
offset = 12 + numTables * 16
wStr = (lambda x:write(bytes(tag,'latin1'))) if isPy3 else write
tables_items = list(sorted(tables.items()))
for tag, data in tables_items:
if tag == 'head':
head_start = offset
checksum = calcChecksum(data)
wStr(tag)
write(pack(">LLL", checksum, offset, len(data)))
paddedLength = (len(data)+3)&~3
offset = offset + paddedLength
# Table data
for tag, data in tables_items:
data += b"\0\0\0"
write(data[:len(data)&~3])
checksum = calcChecksum(stm.getvalue())
checksum = add32(0xB1B0AFBA, -checksum)
stm.seek(head_start + 8)
write(pack('>L', checksum))
return stm.getvalue()
def checksumTables(self):
# Check the checksums for all tables
for t in self.tables:
table = self.get_chunk(t['offset'], t['length'])
checksum = calcChecksum(table)
if t['tag'] == 'head':
adjustment = unpack('>l', table[8:8+4])[0]
checksum = add32(checksum, -adjustment)
xchecksum = t['checksum']
if xchecksum != checksum:
raise TTFError('TTF file "%s": invalid checksum %s table: %s (expected %s)' % (self.filename,hex32(checksum),t['tag'],hex32(xchecksum)))
def checksumTables(self):
# Check the checksums for all tables
for t in self.tables:
table = self.get_chunk(t['offset'], t['length'])
checksum = calcChecksum(table)
if t['tag'] == 'head':
adjustment = unpack('>l', table[8:8+4])[0]
checksum = add32(checksum, -adjustment)
xchecksum = t['checksum']
if xchecksum != checksum:
raise TTFError('TTF file "%s": invalid checksum %s table: %s (expected %s)' % (self.filename,hex32(checksum),t['tag'],hex32(xchecksum)))
def checksumFile(self):
# Check the checksums for the whole file
checksum = calcChecksum(self._ttf_data)
if 0xB1B0AFBA!=checksum:
raise TTFError('TTF file "%s": invalid checksum %s (expected 0xB1B0AFBA) len: %d &3: %d' % (self.filename,hex32(checksum),len(self._ttf_data),(len(self._ttf_data)&3)))
def checksumFile(self):
# Check the checksums for the whole file
checksum = calcChecksum(self._ttf_data)
if 0xB1B0AFBA!=checksum:
raise TTFError('TTF file "%s": invalid checksum %s (expected 0xB1B0AFBA) len: %d &3: %d' % (self.filename,hex32(checksum),len(self._ttf_data),(len(self._ttf_data)&3)))
