static const uint32_t to_ucs4[256] = {
  [0x01] = 0x0001,
  [0x02] = 0x0002,
  [0x03] = 0x0003,
  [0x04] = 0x0004,
  [0x05] = 0x0005,
  [0x06] = 0x0006,
  [0x07] = 0x0007,
  [0x08] = 0x0008,
  [0x09] = 0x0009,
  [0x0a] = 0x000A,
  [0x0b] = 0x000B,
  [0x0c] = 0x000C,
  [0x0d] = 0x000D,
  [0x0e] = 0x000E,
  [0x0f] = 0x000F,
  [0x10] = 0x0010,
  [0x11] = 0x0011,
  [0x12] = 0x0012,
  [0x13] = 0x0013,
  [0x14] = 0x0014,
  [0x15] = 0x0015,
  [0x16] = 0x0016,
  [0x17] = 0x0017,
  [0x18] = 0x0018,
  [0x19] = 0x0019,
  [0x1a] = 0x001A,
  [0x1b] = 0x001B,
  [0x1c] = 0x001C,
  [0x1d] = 0x001D,
  [0x1e] = 0x001E,
  [0x1f] = 0x001F,
  [0x20] = 0x0020,
  [0x30] = 0x0030,
  [0x31] = 0x0031,
  [0x32] = 0x0032,
  [0x33] = 0x0033,
  [0x34] = 0x0034,
  [0x35] = 0x0035,
  [0x36] = 0x0036,
  [0x37] = 0x0037,
  [0x38] = 0x0038,
  [0x39] = 0x0039,
  [0x3a] = 0x2446,
  [0x3b] = 0x2447,
  [0x3c] = 0x2448,
  [0x3d] = 0x2449,
  [0x7f] = 0x007F,
};
static const struct gap from_idx[] = {
  { .start = 0x0000, .end = 0x0020, .idx =     0 },
  { .start = 0x0030, .end = 0x0039, .idx =   -15 },
  { .start = 0x007f, .end = 0x007f, .idx =   -84 },
  { .start = 0x2446, .end = 0x2449, .idx = -9242 },
  { .start = 0xffff, .end = 0xffff, .idx =     0 }
};
static const char from_ucs4[] = {

  '\x00', '\x01', '\x02', '\x03', '\x04', '\x05', '\x06', '\x07',
  '\x08', '\x09', '\x0a', '\x0b', '\x0c', '\x0d', '\x0e', '\x0f',
  '\x10', '\x11', '\x12', '\x13', '\x14', '\x15', '\x16', '\x17',
  '\x18', '\x19', '\x1a', '\x1b', '\x1c', '\x1d', '\x1e', '\x1f',
  '\x20', '\x30', '\x31', '\x32', '\x33', '\x34', '\x35', '\x36',
  '\x37', '\x38', '\x39', '\x7f', '\x3a', '\x3b', '\x3c', '\x3d',
};