def mapData(self, data, maskPattern):
inc = -1
row = self.moduleCount - 1
bitIndex = 7
byteIndex = 0
for col in range(self.moduleCount - 1, 0, -2):
if (col == 6):
col -= 1
while (True):
for c in range(2):
if (self.modules[row][col - c] == None):
dark = False
if (byteIndex < len(data)):
dark = (((data[byteIndex] >> bitIndex) & 1) == 1)
mask = QRUtil.getMask(maskPattern, row, col - c)
if (mask):
dark = not dark
self.modules[row][col - c] = dark
bitIndex -= 1
if (bitIndex == -1):
byteIndex += 1
bitIndex = 7
row += inc
if (row < 0 or self.moduleCount <= row):
row -= inc
inc = -inc
break
