def endTTFile(self, stm):
stm = ''
numTables = count(self.otables)
searchRange = 1
entrySelector = 0
while (searchRange * 2 <= numTables):
searchRange = searchRange * 2
entrySelector = entrySelector + 1
searchRange = searchRange * 16
rangeShift = numTables * 16 - searchRange
# Header
if (_TTF_MAC_HEADER):
stm += (pack(">LHHHH", 0x74727565, numTables, searchRange,
entrySelector, rangeShift)) # Mac
else:
stm += (pack(">LHHHH", 0x00010000, numTables, searchRange,
entrySelector, rangeShift)) # Windows
# Table directory
tables = self.otables
offset = 12 + numTables * 16
sorted_tables = sorted(tables.items())
for tag, data in sorted_tables:
if (tag == 'head'):
head_start = offset
stm += tag
checksum = calcChecksum(data)
stm += pack(">HH", checksum[0], checksum[1])
stm += pack(">LL", offset, strlen(data))
paddedLength = (strlen(data) + 3) & ~3
offset = offset + paddedLength
# Table data
for tag, data in sorted_tables:
data += "\0\0\0"
stm += substr(data, 0, (strlen(data) & ~3))
checksum = calcChecksum(stm)
checksum = sub32((0xB1B0, 0xAFBA), checksum)
chk = pack(">HH", checksum[0], checksum[1])
stm = self.splice(stm, (head_start + 8), chk)
return stm
def endTTFile(self, stm):
stm = ''
numTables = count(self.otables)
searchRange = 1
entrySelector = 0
while (searchRange * 2 <= numTables):
searchRange = searchRange * 2
entrySelector = entrySelector + 1
searchRange = searchRange * 16
rangeShift = numTables * 16 - searchRange
# Header
if (_TTF_MAC_HEADER):
stm += (pack(">LHHHH", 0x74727565, numTables, searchRange, entrySelector, rangeShift)) # Mac
else:
stm += (pack(">LHHHH", 0x00010000 , numTables, searchRange, entrySelector, rangeShift)) # Windows
# Table directory
tables = self.otables
offset = 12 + numTables * 16
sorted_tables = sorted(tables.items())
for tag, data in sorted_tables:
if (tag == 'head'):
head_start = offset
stm += tag
checksum = calcChecksum(data)
stm += pack(">HH", checksum[0],checksum[1])
stm += pack(">LL", offset, strlen(data))
paddedLength = (strlen(data)+3)&~3
offset = offset + paddedLength
# Table data
for tag, data in sorted_tables:
data += "\0\0\0"
stm += substr(data,0,(strlen(data)&~3))
checksum = calcChecksum(stm)
checksum = sub32((0xB1B0,0xAFBA), checksum)
chk = pack(">HH", checksum[0],checksum[1])
stm = self.splice(stm,(head_start + 8),chk)
return stm
def calcChecksum(data):
if (strlen(data) % 4):
data += str_repeat("\0", (4 - (len(data) % 4)))
hi = 0x0000
lo = 0x0000
for i in range(0, len(data), 4):
hi += (ord(data[i]) << 8) + ord(data[i + 1])
lo += (ord(data[i + 2]) << 8) + ord(data[i + 3])
hi += lo >> 16
lo = lo & 0xFFFF
hi = hi & 0xFFFF
return (hi, lo)
def calcChecksum(data):
if (strlen(data) % 4):
data += str_repeat("\0", (4-(len(data) % 4)))
hi=0x0000
lo=0x0000
for i in range(0, len(data), 4):
hi += (ord(data[i])<<8) + ord(data[i+1])
lo += (ord(data[i+2])<<8) + ord(data[i+3])
hi += lo >> 16
lo = lo & 0xFFFF
hi = hi & 0xFFFF
return (hi, lo)
def splice(self, stream, offset, value):
return substr(stream, 0, offset) + value + substr(
stream, offset + strlen(value))
def splice(self, stream, offset, value):
return substr(stream,0,offset) + value + substr(stream,offset+strlen(value))
