big5 convert

# Converts Nano-X BG2UBG.KU Big5/Unicode conversion table to a format we
# can use with the HZK fonts.

import struct
import sys

table = open(sys.argv[1]).read()

done = set()
print 'uint16_t hzk2uni[] = {'

for i in range(0, len(table) / 4 - 1):
  big5, unicode = struct.unpack('<HH', table[i * 4 : i * 4 + 4])

  # decode Big5
  cl = big5 & 0xff
  ch = big5 >> 8
  if cl < 127:
    cl -= 64
  else:
    cl -= 98
  if ch >= 0xa4:
    seq = ((ch - 164) * 157) + cl
    if seq > 5809:
      seq -= 408;
  if ch <= 0xa3:
    seq = (((ch - 161) * 157) + cl) + 13094

  if not seq in done:
    print '    [0x%04x] = 0x%04x,' % (seq, unicode)
    done.add(seq)

print '};'