[otTables] Support uint8 type in otTables

Lib/fontTools/ttLib/tables/otBase.py

@@ -167,6 +167,13 @@ class OTTableReader(object):
 		self.pos = newpos
 		return value
 
+	def readUInt8(self):
+		pos = self.pos
+		newpos = pos + 1
+		value, = struct.unpack(">B", self.data[pos:newpos])
+		self.pos = newpos
+		return value
+
 	def readUInt24(self):
 		pos = self.pos
 		newpos = pos + 3
@@ -446,6 +453,10 @@ class OTTableWriter(object):
 	def writeShort(self, value):
 		self.items.append(struct.pack(">h", value))
 
+	def writeUInt8(self, value):
+		assert 0 <= value < 256
+		self.items.append(struct.pack(">B", value))
+
 	def writeUInt24(self, value):
 		assert 0 <= value < 0x1000000
 		b = struct.pack(">L", value)

Lib/fontTools/ttLib/tables/otBase_test.py

@@ -16,6 +16,11 @@ class OTTableReaderTest(unittest.TestCase):
         self.assertEqual(reader.readLong(), -889274641)
         self.assertEqual(reader.pos, 4)
 
+    def test_readUInt8(self):
+        reader = OTTableReader(deHexStr("C3"))
+        self.assertEqual(reader.readUInt8(), 0xC3)
+        self.assertEqual(reader.pos, 1)
+
     def test_readUShort(self):
         reader = OTTableReader(deHexStr("CA FE"))
         self.assertEqual(reader.readUShort(), 0xCAFE)
@@ -53,6 +58,11 @@ class OTTableWriterTest(unittest.TestCase):
         writer.writeLong(-12345678)
         self.assertEqual(writer.getData(), deHexStr("FF 43 9E B2"))
 
+    def test_writeUInt8(self):
+        writer = OTTableWriter(globalState={})
+        writer.writeUInt8(0xBE)
+        self.assertEqual(writer.getData(), deHexStr("BE"))
+
     def test_writeUShort(self):
         writer = OTTableWriter(globalState={})
         writer.writeUShort(0xBEEF)

Lib/fontTools/ttLib/tables/otConverters.py

@@ -175,6 +175,13 @@ class UShort(IntValue):
 	def write(self, writer, font, tableDict, value, repeatIndex=None):
 		writer.writeUShort(value)
 
+class UInt8(IntValue):
+	staticSize = 1
+	def read(self, reader, font, tableDict):
+		return reader.readUInt8()
+	def write(self, writer, font, tableDict, value, repeatIndex=None):
+		writer.writeUInt8(value)
+
 class UInt24(IntValue):
 	staticSize = 3
 	def read(self, reader, font, tableDict):
@@ -464,7 +471,8 @@ class DeltaValue(BaseConverter):
 
 converterMapping = {
 	# type		class
-	"int16":		Short,
+	"int16":	Short,
+	"uint8":	UInt8,
 	"uint16":	UShort,
 	"uint24":	UInt24,
 	"uint32":	ULong,