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,
  [0x21] = 0x0021,
  [0x22] = 0x0022,
  [0x23] = 0x0023,
  [0x24] = 0x00A4,
  [0x25] = 0x0025,
  [0x26] = 0x0026,
  [0x27] = 0x0027,
  [0x28] = 0x0028,
  [0x29] = 0x0029,
  [0x2a] = 0x002A,
  [0x2b] = 0x002B,
  [0x2c] = 0x002C,
  [0x2d] = 0x002D,
  [0x2e] = 0x002E,
  [0x2f] = 0x002F,
  [0x30] = 0x0030,
  [0x31] = 0x0031,
  [0x32] = 0x0032,
  [0x33] = 0x0033,
  [0x34] = 0x0034,
  [0x35] = 0x0035,
  [0x36] = 0x0036,
  [0x37] = 0x0037,
  [0x38] = 0x0038,
  [0x39] = 0x0039,
  [0x3a] = 0x003A,
  [0x3b] = 0x003B,
  [0x3c] = 0x003C,
  [0x3d] = 0x003D,
  [0x3e] = 0x003E,
  [0x3f] = 0x003F,
  [0x40] = 0x0040,
  [0x41] = 0x0391,
  [0x42] = 0x0392,
  [0x43] = 0x0393,
  [0x44] = 0x0394,
  [0x45] = 0x0395,
  [0x46] = 0x0396,
  [0x47] = 0x0397,
  [0x48] = 0x0398,
  [0x49] = 0x0399,
  [0x4a] = 0x039A,
  [0x4b] = 0x039B,
  [0x4c] = 0x039C,
  [0x4d] = 0x039D,
  [0x4e] = 0x039E,
  [0x4f] = 0x039F,
  [0x50] = 0x03A0,
  [0x51] = 0x03A1,
  [0x53] = 0x03A3,
  [0x54] = 0x03A4,
  [0x55] = 0x03A5,
  [0x56] = 0x03A6,
  [0x57] = 0x03A7,
  [0x58] = 0x03A8,
  [0x59] = 0x03A9,
  [0x5b] = 0x005B,
  [0x5c] = 0x005C,
  [0x5d] = 0x005D,
  [0x5e] = 0x005E,
  [0x5f] = 0x005F,
  [0x61] = 0x03B1,
  [0x62] = 0x03B2,
  [0x63] = 0x03B3,
  [0x64] = 0x03B4,
  [0x65] = 0x03B5,
  [0x66] = 0x03B6,
  [0x67] = 0x03B7,
  [0x68] = 0x03B8,
  [0x69] = 0x03B9,
  [0x6a] = 0x03BA,
  [0x6b] = 0x03BB,
  [0x6c] = 0x03BC,
  [0x6d] = 0x03BD,
  [0x6e] = 0x03BE,
  [0x6f] = 0x03BF,
  [0x70] = 0x03C0,
  [0x71] = 0x03C1,
  [0x72] = 0x03C2,
  [0x73] = 0x03C3,
  [0x74] = 0x03C4,
  [0x75] = 0x03C5,
  [0x76] = 0x03C6,
  [0x77] = 0x03C7,
  [0x78] = 0x03C8,
  [0x79] = 0x03C9,
  [0x7b] = 0x007B,
  [0x7c] = 0x007C,
  [0x7d] = 0x007D,
  [0x7e] = 0x00AF,
  [0x7f] = 0x007F,
};
static const struct gap from_idx[] = {
  { .start = 0x0000, .end = 0x0040, .idx =     0 },
  { .start = 0x005b, .end = 0x005f, .idx =   -26 },
  { .start = 0x007b, .end = 0x007f, .idx =   -53 },
  { .start = 0x00a4, .end = 0x00a4, .idx =   -89 },
  { .start = 0x00af, .end = 0x00af, .idx =   -99 },
  { .start = 0x0391, .end = 0x03a9, .idx =  -836 },
  { .start = 0x03b1, .end = 0x03c9, .idx =  -843 },
  { .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', '\x21', '\x22', '\x23', '\x00', '\x25', '\x26', '\x27',
  '\x28', '\x29', '\x2a', '\x2b', '\x2c', '\x2d', '\x2e', '\x2f',
  '\x30', '\x31', '\x32', '\x33', '\x34', '\x35', '\x36', '\x37',
  '\x38', '\x39', '\x3a', '\x3b', '\x3c', '\x3d', '\x3e', '\x3f',
  '\x40', '\x5b', '\x5c', '\x5d', '\x5e', '\x5f', '\x7b', '\x7c',
  '\x7d', '\x00', '\x7f', '\x24', '\x7e', '\x41', '\x42', '\x43',
  '\x44', '\x45', '\x46', '\x47', '\x48', '\x49', '\x4a', '\x4b',
  '\x4c', '\x4d', '\x4e', '\x4f', '\x50', '\x51', '\x00', '\x53',
  '\x54', '\x55', '\x56', '\x57', '\x58', '\x59', '\x61', '\x62',
  '\x63', '\x64', '\x65', '\x66', '\x67', '\x68', '\x69', '\x6a',
  '\x6b', '\x6c', '\x6d', '\x6e', '\x6f', '\x70', '\x71', '\x72',
  '\x73', '\x74', '\x75', '\x76', '\x77', '\x78', '\x79',
};