diff -urN fonttools-3.0/Lib/fontTools/ttLib/tables/E_B_L_C_.py fonttools-3.0.new/Lib/fontTools/ttLib/tables/E_B_L_C_.py
--- fonttools-3.0/Lib/fontTools/ttLib/tables/E_B_L_C_.py	2015-08-31 23:27:15.000000000 +0530
+++ fonttools-3.0.new/Lib/fontTools/ttLib/tables/E_B_L_C_.py	2016-03-06 14:03:58.406847533 +0530
@@ -71,44 +71,46 @@
 
 		# Save the original data because offsets are from the start of the table.
 		origData = data
+		i=0
 
-		dummy, data = sstruct.unpack2(eblcHeaderFormat, data, self)
-
+		dummy = sstruct.unpack(eblcHeaderFormat, data[:8], self)
+		i += 8
 		self.strikes = []
 		for curStrikeIndex in range(self.numSizes):
 			curStrike = Strike()
 			self.strikes.append(curStrike)
 			curTable = curStrike.bitmapSizeTable
-			dummy, data = sstruct.unpack2(bitmapSizeTableFormatPart1, data, curTable)
+			dummy = sstruct.unpack2(bitmapSizeTableFormatPart1, data[i:i+16], curTable)
+			i += 16
 			for metric in ('hori', 'vert'):
 				metricObj = SbitLineMetrics()
 				vars(curTable)[metric] = metricObj
-				dummy, data = sstruct.unpack2(sbitLineMetricsFormat, data, metricObj)
-			dummy, data = sstruct.unpack2(bitmapSizeTableFormatPart2, data, curTable)
+				dummy = sstruct.unpack2(sbitLineMetricsFormat, data[i:i+12], metricObj)
+				i += 12
+			dummy = sstruct.unpack(bitmapSizeTableFormatPart2, data[i:i+8], curTable)
+			i += 8
 
 		for curStrike in self.strikes:
 			curTable = curStrike.bitmapSizeTable
 			for subtableIndex in range(curTable.numberOfIndexSubTables):
-				lowerBound = curTable.indexSubTableArrayOffset + subtableIndex * indexSubTableArraySize
-				upperBound = lowerBound + indexSubTableArraySize
-				data = origData[lowerBound:upperBound]
+				i = curTable.indexSubTableArrayOffset + subtableIndex * indexSubTableArraySize
 
-				tup = struct.unpack(indexSubTableArrayFormat, data)
+				tup = struct.unpack(indexSubTableArrayFormat, data[i:i+indexSubTableArraySize])
 				(firstGlyphIndex, lastGlyphIndex, additionalOffsetToIndexSubtable) = tup
-				offsetToIndexSubTable = curTable.indexSubTableArrayOffset + additionalOffsetToIndexSubtable
-				data = origData[offsetToIndexSubTable:]
+				i = curTable.indexSubTableArrayOffset + additionalOffsetToIndexSubtable
 
-				tup = struct.unpack(indexSubHeaderFormat, data[:indexSubHeaderSize])
+				tup = struct.unpack(indexSubHeaderFormat, data[i:i+indexSubHeaderSize])
 				(indexFormat, imageFormat, imageDataOffset) = tup
 
 				indexFormatClass = self.getIndexFormatClass(indexFormat)
-				indexSubTable = indexFormatClass(data[indexSubHeaderSize:], ttFont)
+				indexSubTable = indexFormatClass(data[i+indexSubHeaderSize:], ttFont)
 				indexSubTable.firstGlyphIndex = firstGlyphIndex
 				indexSubTable.lastGlyphIndex = lastGlyphIndex
 				indexSubTable.additionalOffsetToIndexSubtable = additionalOffsetToIndexSubtable
 				indexSubTable.indexFormat = indexFormat
 				indexSubTable.imageFormat = imageFormat
 				indexSubTable.imageDataOffset = imageDataOffset
+				indexSubTable.decompile() # https://github.com/behdad/fonttools/issues/317
 				curStrike.indexSubTables.append(indexSubTable)
 
 	def compile(self, ttFont):
@@ -336,7 +338,6 @@
 		if not hasattr(self, "data"):
 			raise AttributeError(attr)
 		self.decompile()
-		del self.data, self.ttFont
 		return getattr(self, attr)
 
 	# This method just takes care of the indexSubHeader. Implementing subclasses
@@ -439,6 +440,7 @@
 
 			self.names = list(map(self.ttFont.getGlyphName, glyphIds))
 			self.removeSkipGlyphs()
+			del self.data, self.ttFont
 
 		def compile(self, ttFont):
 			# First make sure that all the data lines up properly. Formats 1 and 3
@@ -525,6 +527,7 @@
 		offsets = [self.imageSize * i + self.imageDataOffset for i in range(len(glyphIds)+1)]
 		self.locations = list(zip(offsets, offsets[1:]))
 		self.names = list(map(self.ttFont.getGlyphName, glyphIds))
+		del self.data, self.ttFont
 
 	def compile(self, ttFont):
 		glyphIds = list(map(ttFont.getGlyphID, self.names))
@@ -556,6 +559,7 @@
 		offsets = [offset + self.imageDataOffset for offset in offsets]
 		self.locations = list(zip(offsets, offsets[1:]))
 		self.names = list(map(self.ttFont.getGlyphName, glyphIds))
+		del self.data, self.ttFont
 
 	def compile(self, ttFont):
 		# First make sure that all the data lines up properly. Format 4
@@ -594,6 +598,7 @@
 		offsets = [self.imageSize * i + self.imageDataOffset for i in range(len(glyphIds)+1)]
 		self.locations = list(zip(offsets, offsets[1:]))
 		self.names = list(map(self.ttFont.getGlyphName, glyphIds))
+		del self.data, self.ttFont
 
 	def compile(self, ttFont):
 		self.imageDataOffset = min(zip(*self.locations)[0])