Ethernet QR Code Bridge [Create WiFi QRcode]

from uos import uname
from usys import implementation
from machine import I2C
from time import sleep
from ssd1306 import SSD1306_I2C
from usocket import socket
from machine import Pin,SPI
import network
import time
import ure as re

"""
Exceptions

Formerly in exceptions.py
"""

class DataOverflowError(Exception):
    pass

"""
Constants

Formerly in constants.py
"""

# QR error correct levels
ERROR_CORRECT_L = 1
ERROR_CORRECT_M = 0
ERROR_CORRECT_Q = 3
ERROR_CORRECT_H = 2

"""
LUT

Formerly in LUT.py
"""
# Store all kinds of lookup table.


# # generate rsPoly lookup table.

# from qrcode import base

# def create_bytes(rs_blocks):
#     for r in range(len(rs_blocks)):
#         dcCount = rs_blocks[r].data_count
#         ecCount = rs_blocks[r].total_count - dcCount
#         rsPoly = base.Polynomial([1], 0)
#         for i in range(ecCount):
#             rsPoly = rsPoly * base.Polynomial([1, base.gexp(i)], 0)
#         return ecCount, rsPoly

# rsPoly_LUT = {}
# for version in range(1,41):
#     for error_correction in range(4):
#         rs_blocks_list = base.rs_blocks(version, error_correction)
#         ecCount, rsPoly = create_bytes(rs_blocks_list)
#         rsPoly_LUT[ecCount]=rsPoly.num
# print(rsPoly_LUT)

# Result. Usage: input: ecCount, output: Polynomial.num
# e.g. rsPoly = base.Polynomial(LUT.rsPoly_LUT[ecCount], 0)
rsPoly_LUT = {
    7: b'\x01\x7fz\x9a\xa4\x0bDu',
    10: b'\x01\xd8\xc2\x9fo\xc7^_q\x9d\xc1',
    13: b'\x01\x89I\xe3\x11\xb1\x114\r.+S\x84x',
    15: b'\x01\x1d\xc4o\xa3pJ\nii\x8b\x84\x97 \x86\x1a',
    16: b'\x01;\rh\xbdD\xd1\x1e\x08\xa3A)\xe5b2$;',
    17: b'\x01wBSxw\x16\xc5S\xf9)\x8f\x86U5}cO',
    18: b'\x01\xef\xfb\xb7q\x95\xaf\xc7\xd7\xf0\xdcIR\xadK C\xd9\x92',
    20: b'\x01\x98\xb9\xf0\x05oc\x06\xdcp\x96E$\xbb\x16\xe4\xc6yy\xa5\xae',
    22: b'\x01Y\xb3\x83\xb0\xb6\xf4\x13\xbdE(\x1c\x89\x1d{C\xfdV\xda\xe6\x1a\x91\xf5',
    24: b'\x01zv\xa9F\xb2\xed\xd8fs\x96\xe5I\x82H=+\xce\x01\xed\xf7\x7f\xd9\x90u',
    26: b'\x01\xf63\xb7\x04\x88b\xc7\x98M8\xce\x18\x91(\xd1u\xe9*\x87DF\x90\x92M+^',
    28: b'\x01\xfc\t\x1c\r\x12\xfb\xd0\x96g\xaed)\xa7\x0c\xf78uw\xe9\x7f\xb5dy\x93\xb0J:\xc5',
    30: b'\x01\xd4\xf6MI\xc3\xc0Kb\x05Fg\xb1\x16\xd9\x8a3\xb5\xf6H\x19\x12.\xe4J\xd8\xc3\x0bj\x82\x96',
}

"""
Base

Formerly in base.py
"""

EXP_TABLE = list(range(256))

LOG_TABLE = list(range(256))

for i in range(8):
    EXP_TABLE[i] = 1 << i

for i in range(8, 256):
    EXP_TABLE[i] = (
        EXP_TABLE[i - 4] ^ EXP_TABLE[i - 5] ^ EXP_TABLE[i - 6] ^
        EXP_TABLE[i - 8])

for i in range(255):
    LOG_TABLE[EXP_TABLE[i]] = i

RS_BLOCK_OFFSET = {
    ERROR_CORRECT_L: 0,
    ERROR_CORRECT_M: 1,
    ERROR_CORRECT_Q: 2,
    ERROR_CORRECT_H: 3,
}

RS_BLOCK_TABLE = [
    b'\x01\x1a\x13',
    b'\x01\x1a\x10',
    b'\x01\x1a\r',
    b'\x01\x1a\t',
    b'\x01,"',
    b'\x01,\x1c',
    b'\x01,\x16',
    b'\x01,\x10',
    b'\x01F7',
    b'\x01F,',
    b'\x02#\x11',
    b'\x02#\r',
    b'\x01dP',
    b'\x022 ',
    b'\x022\x18',
    b'\x04\x19\t',
    b'\x01\x86l',
    b'\x02C+',
    b'\x02!\x0f\x02"\x10',
    b'\x02!\x0b\x02"\x0c',
    b'\x02VD',
    b'\x04+\x1b',
    b'\x04+\x13',
    b'\x04+\x0f',
    b'\x02bN',
    b'\x041\x1f',
    b'\x02 \x0e\x04!\x0f',
    b"\x04'\r\x01(\x0e",
    b'\x02ya',
    b"\x02<&\x02='",
    b'\x04(\x12\x02)\x13',
    b'\x04(\x0e\x02)\x0f',
    b'\x02\x92t',
    b'\x03:$\x02;%',
    b'\x04$\x10\x04%\x11',
    b'\x04$\x0c\x04%\r',
    b'\x02VD\x02WE',
    b'\x04E+\x01F,',
    b'\x06+\x13\x02,\x14',
    b'\x06+\x0f\x02,\x10',
    b'\x04eQ',
    b'\x01P2\x04Q3',
    b'\x042\x16\x043\x17',
    b'\x03$\x0c\x08%\r',
    b'\x02t\\\x02u]',
    b'\x06:$\x02;%',
    b'\x04.\x14\x06/\x15',
    b'\x07*\x0e\x04+\x0f',
    b'\x04\x85k',
    b'\x08;%\x01<&',
    b'\x08,\x14\x04-\x15',
    b'\x0c!\x0b\x04"\x0c',
    b'\x03\x91s\x01\x92t',
    b'\x04@(\x05A)',
    b'\x0b$\x10\x05%\x11',
    b'\x0b$\x0c\x05%\r',
    b'\x05mW\x01nX',
    b'\x05A)\x05B*',
    b'\x056\x18\x077\x19',
    b'\x0b$\x0c\x07%\r',
    b'\x05zb\x01{c',
    b'\x07I-\x03J.',
    b'\x0f+\x13\x02,\x14',
    b'\x03-\x0f\r.\x10',
    b'\x01\x87k\x05\x88l',
    b'\nJ.\x01K/',
    b'\x012\x16\x0f3\x17',
    b'\x02*\x0e\x11+\x0f',
    b'\x05\x96x\x01\x97y',
    b'\tE+\x04F,',
    b'\x112\x16\x013\x17',
    b'\x02*\x0e\x13+\x0f',
    b'\x03\x8dq\x04\x8er',
    b'\x03F,\x0bG-',
    b'\x11/\x15\x040\x16',
    b"\t'\r\x10(\x0e",
    b'\x03\x87k\x05\x88l',
    b'\x03C)\rD*',
    b'\x0f6\x18\x057\x19',
    b'\x0f+\x0f\n,\x10',
    b'\x04\x90t\x04\x91u',
    b'\x11D*',
    b'\x112\x16\x063\x17',
    b'\x13.\x10\x06/\x11',
    b'\x02\x8bo\x07\x8cp',
    b'\x11J.',
    b'\x076\x18\x107\x19',
    b'"%\r',
    b'\x04\x97y\x05\x98z',
    b'\x04K/\x0eL0',
    b'\x0b6\x18\x0e7\x19',
    b'\x10-\x0f\x0e.\x10',
    b'\x06\x93u\x04\x94v',
    b'\x06I-\x0eJ.',
    b'\x0b6\x18\x107\x19',
    b'\x1e.\x10\x02/\x11',
    b'\x08\x84j\x04\x85k',
    b'\x08K/\rL0',
    b'\x076\x18\x167\x19',
    b'\x16-\x0f\r.\x10',
    b'\n\x8er\x02\x8fs',
    b'\x13J.\x04K/',
    b'\x1c2\x16\x063\x17',
    b'!.\x10\x04/\x11',
    b'\x08\x98z\x04\x99{',
    b'\x16I-\x03J.',
    b'\x085\x17\x1a6\x18',
    b'\x0c-\x0f\x1c.\x10',
    b'\x03\x93u\n\x94v',
    b'\x03I-\x17J.',
    b'\x046\x18\x1f7\x19',
    b'\x0b-\x0f\x1f.\x10',
    b'\x07\x92t\x07\x93u',
    b'\x15I-\x07J.',
    b'\x015\x17%6\x18',
    b'\x13-\x0f\x1a.\x10',
    b'\x05\x91s\n\x92t',
    b'\x13K/\nL0',
    b'\x0f6\x18\x197\x19',
    b'\x17-\x0f\x19.\x10',
    b'\r\x91s\x03\x92t',
    b'\x02J.\x1dK/',
    b'*6\x18\x017\x19',
    b'\x17-\x0f\x1c.\x10',
    b'\x11\x91s',
    b'\nJ.\x17K/',
    b'\n6\x18#7\x19',
    b'\x13-\x0f#.\x10',
    b'\x11\x91s\x01\x92t',
    b'\x0eJ.\x15K/',
    b'\x1d6\x18\x137\x19',
    b'\x0b-\x0f..\x10',
    b'\r\x91s\x06\x92t',
    b'\x0eJ.\x17K/',
    b',6\x18\x077\x19',
    b';.\x10\x01/\x11',
    b'\x0c\x97y\x07\x98z',
    b'\x0cK/\x1aL0',
    b"'6\x18\x0e7\x19",
    b'\x16-\x0f).\x10',
    b'\x06\x97y\x0e\x98z',
    b'\x06K/"L0',
    b'.6\x18\n7\x19',
    b'\x02-\x0f@.\x10',
    b'\x11\x98z\x04\x99{',
    b'\x1dJ.\x0eK/',
    b'16\x18\n7\x19',
    b'\x18-\x0f..\x10',
    b'\x04\x98z\x12\x99{',
    b'\rJ. K/',
    b'06\x18\x0e7\x19',
    b'*-\x0f .\x10',
    b'\x14\x93u\x04\x94v',
    b'(K/\x07L0',
    b'+6\x18\x167\x19',
    b'\n-\x0fC.\x10',
    b'\x13\x94v\x06\x95w',
    b'\x12K/\x1fL0',
    b'"6\x18"7\x19',
    b'\x14-\x0f=.\x10',
]

def glog(n):
    if n < 1:  # pragma: no cover
        raise ValueError("glog(%s)" % n)
    return LOG_TABLE[n]


def gexp(n):
    return EXP_TABLE[n % 255]


class Polynomial:

    def __init__(self, num, shift):
        if not num:  # pragma: no cover
            raise Exception("%s/%s" % (len(num), shift))

        for offset in range(len(num)):
            if num[offset] != 0:
                break
        else:
            offset += 1
        if isinstance(num[offset:], bytes):
            shift_chunk = b'\x00'*shift
        elif isinstance(num[offset:], list):
            shift_chunk = [0]*shift
        self.num = bytearray(num[offset:]+shift_chunk)

    def __getitem__(self, index):
        return self.num[index]

    def __iter__(self):
        return iter(self.num)

    def __len__(self):
        return len(self.num)

    def __mul__(self, other):
        num = [0] * (len(self) + len(other) - 1)

        for i, item in enumerate(self):
            for j, other_item in enumerate(other):
                num[i + j] ^= gexp(glog(item) + glog(other_item))

        return Polynomial(num, 0)

    """
    EDIT
    """

    def __mod__(self, other):

        this = self

        while True:
            difference = len(this) - len(other)

            if difference < 0:
                break

            ratio = glog(this[0]) - glog(other[0])

            num = [
                item ^ gexp(glog(other_item) + ratio)
                for item, other_item in zip(this, other)]
            if difference:
                num.extend(this[-difference:])

            this = Polynomial(num, 0)

        return this


class RSBlock:

    def __init__(self, total_count, data_count):
        self.total_count = total_count
        self.data_count = data_count


def make_rs_blocks(version, error_correction):
    if error_correction not in RS_BLOCK_OFFSET:  # pragma: no cover
        raise Exception(
            "bad rs block @ version: %s / error_correction: %s" %
            (version, error_correction))
    offset = RS_BLOCK_OFFSET[error_correction]
    rs_block = RS_BLOCK_TABLE[(version - 1) * 4 + offset]

    blocks = []

    for i in range(0, len(rs_block), 3):
        count, total_count, data_count = rs_block[i:i + 3]
        for j in range(count):
            blocks.append(RSBlock(total_count, data_count))

    return blocks


"""
Utilities

Formerly in utils.py
"""

# QR encoding modes.
MODE_NUMBER = 1 << 0
MODE_ALPHA_NUM = 1 << 1
MODE_8BIT_BYTE = 1 << 2
MODE_KANJI = 1 << 3

# Encoding mode sizes.
MODE_SIZE_SMALL = {
    MODE_NUMBER: 10,
    MODE_ALPHA_NUM: 9,
    MODE_8BIT_BYTE: 8,
    MODE_KANJI: 8,
}
MODE_SIZE_MEDIUM = {
    MODE_NUMBER: 12,
    MODE_ALPHA_NUM: 11,
    MODE_8BIT_BYTE: 16,
    MODE_KANJI: 10,
}
MODE_SIZE_LARGE = {
    MODE_NUMBER: 14,
    MODE_ALPHA_NUM: 13,
    MODE_8BIT_BYTE: 16,
    MODE_KANJI: 12,
}

ALPHA_NUM = b'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ $%*+-./:;#&{}[](),=\'"\\'

RE_ALPHA_NUM = re.compile(b'^[' + ALPHA_NUM + b']*')
# The number of bits for numeric delimited data lengths.
NUMBER_LENGTH = {3: 10, 2: 7, 1: 4}

PATTERN_POSITION_TABLE = [
    b'',
    b'\x06\x12',
    b'\x06\x16',
    b'\x06\x1a',
    b'\x06\x1e',
    b'\x06"',
    b'\x06\x16&',
    b'\x06\x18*',
    b'\x06\x1a.',
    b'\x06\x1c2',
    b'\x06\x1e6',
    b'\x06 :',
    b'\x06">',
    b'\x06\x1a.B',
    b'\x06\x1a0F',
    b'\x06\x1a2J',
    b'\x06\x1e6N',
    b'\x06\x1e8R',
    b'\x06\x1e:V',
    b'\x06">Z',
    b'\x06\x1c2H^',
    b'\x06\x1a2Jb',
    b'\x06\x1e6Nf',
    b'\x06\x1c6Pj',
    b'\x06 :Tn',
    b'\x06\x1e:Vr',
    b'\x06">Zv',
    b'\x06\x1a2Jbz',
    b'\x06\x1e6Nf~',
    b'\x06\x1a4Nh\x82',
    b'\x06\x1e8Rl\x86',
    b'\x06"<Vp\x8a',
    b'\x06\x1e:Vr\x8e',
    b'\x06">Zv\x92',
    b'\x06\x1e6Nf~\x96',
    b'\x06\x182Lf\x80\x9a',
    b'\x06\x1c6Pj\x84\x9e',
    b'\x06 :Tn\x88\xa2',
    b'\x06\x1a6Rn\x8a\xa6',
    b'\x06\x1e:Vr\x8e\xaa',
]

G15 = (
    (1 << 10) | (1 << 8) | (1 << 5) | (1 << 4) | (1 << 2) | (1 << 1) |
    (1 << 0))
G18 = (
    (1 << 12) | (1 << 11) | (1 << 10) | (1 << 9) | (1 << 8) | (1 << 5) |
    (1 << 2) | (1 << 0))
G15_MASK = (1 << 14) | (1 << 12) | (1 << 10) | (1 << 4) | (1 << 1)

PAD0 = 0xEC
PAD1 = 0x11

# Precompute bit count limits, indexed by error correction level and code size
_data_count = lambda block: block.data_count
BIT_LIMIT_TABLE = [
    [0] + [8*sum(map(_data_count, make_rs_blocks(version, error_correction)))
           for version in range(1, 41)]
    for error_correction in range(4)
]


def BCH_type_info(data):
        d = data << 10
        while BCH_digit(d) - BCH_digit(G15) >= 0:
            d ^= (G15 << (BCH_digit(d) - BCH_digit(G15)))

        return ((data << 10) | d) ^ G15_MASK


def BCH_type_number(data):
    d = data << 12
    while BCH_digit(d) - BCH_digit(G18) >= 0:
        d ^= (G18 << (BCH_digit(d) - BCH_digit(G18)))
    return (data << 12) | d


def BCH_digit(data):
    digit = 0
    while data != 0:
        digit += 1
        data >>= 1
    return digit


def pattern_position(version):
    return PATTERN_POSITION_TABLE[version - 1]


def make_mask_func(pattern):
    """
    Return the mask function for the given mask pattern.
    """
    if pattern == 0:   # 000
        return lambda i, j: (i + j) % 2 == 0
    if pattern == 1:   # 001
        return lambda i, j: i % 2 == 0
    if pattern == 2:   # 010
        return lambda i, j: j % 3 == 0
    if pattern == 3:   # 011
        return lambda i, j: (i + j) % 3 == 0
    if pattern == 4:   # 100
        return lambda i, j: (int(i / 2) + int(j / 3)) % 2 == 0
    if pattern == 5:  # 101
        return lambda i, j: (i * j) % 2 + (i * j) % 3 == 0
    if pattern == 6:  # 110
        return lambda i, j: ((i * j) % 2 + (i * j) % 3) % 2 == 0
    if pattern == 7:  # 111
        return lambda i, j: ((i * j) % 3 + (i + j) % 2) % 2 == 0
    raise TypeError("Bad mask pattern: " + pattern)  # pragma: no cover


def mode_sizes_for_version(version):
    if version < 10:
        return MODE_SIZE_SMALL
    elif version < 27:
        return MODE_SIZE_MEDIUM
    else:
        return MODE_SIZE_LARGE


def length_in_bits(mode, version):
    if mode not in (
            MODE_NUMBER, MODE_ALPHA_NUM, MODE_8BIT_BYTE, MODE_KANJI):
        raise TypeError("Invalid mode (%s)" % mode)  # pragma: no cover

    if version < 1 or version > 40:  # pragma: no cover
        raise ValueError(
            "Invalid version (was %s, expected 1 to 40)" % version)

    return mode_sizes_for_version(version)[mode]


def make_lost_point(modules):
    modules_count = len(modules)

    lost_point = 0

    lost_point = _lost_point_level1(modules, modules_count)
    lost_point += _lost_point_level2(modules, modules_count)
    lost_point += _lost_point_level3(modules, modules_count)
    lost_point += _lost_point_level4(modules, modules_count)

    return lost_point


def _lost_point_level1(modules, modules_count):
    lost_point = 0

    modules_range = range(modules_count)
    container = [0] * (modules_count + 1)

    for row in modules_range:
        this_row = modules[row]
        previous_color = this_row[0]
        length = 0
        for col in modules_range:
            if this_row[col] == previous_color:
                length += 1
            else:
                if length >= 5:
                    container[length] += 1
                length = 1
                previous_color = this_row[col]
        if length >= 5:
            container[length] += 1

    for col in modules_range:
        previous_color = modules[0][col]
        length = 0
        for row in modules_range:
            if modules[row][col] == previous_color:
                length += 1
            else:
                if length >= 5:
                    container[length] += 1
                length = 1
                previous_color = modules[row][col]
        if length >= 5:
            container[length] += 1

    lost_point += sum(container[each_length] * (each_length - 2)
        for each_length in range(5, modules_count + 1))

    return lost_point


def _lost_point_level2(modules, modules_count):
    lost_point = 0

    modules_range = range(modules_count - 1)
    for row in modules_range:
        this_row = modules[row]
        next_row = modules[row + 1]
        # use iter() and next() to skip next four-block. e.g.
        # d a f   if top-right a != b botton-right,
        # c b e   then both abcd and abef won't lost any point.
        modules_range_iter = iter(modules_range)
        for col in modules_range_iter:
            top_right = this_row[col + 1]
            if top_right != next_row[col + 1]:
                # reduce 33.3% of runtime via next().
                # None: raise nothing if there is no next item.
                try:
                    next(modules_range_iter)
                except StopIteration:
                    pass
            elif top_right != this_row[col]:
                continue
            elif top_right != next_row[col]:
                continue
            else:
                lost_point += 3

    return lost_point


def _lost_point_level3(modules, modules_count):
    # 1 : 1 : 3 : 1 : 1 ratio (dark:light:dark:light:dark) pattern in
    # row/column, preceded or followed by light area 4 modules wide. From ISOIEC.
    # pattern1:     10111010000
    # pattern2: 00001011101
    modules_range = range(modules_count)
    modules_range_short = range(modules_count-10)
    lost_point = 0

    for row in modules_range:
        this_row = modules[row]
        modules_range_short_iter = iter(modules_range_short)
        col = 0
        for col in modules_range_short_iter:
            if (
                        not this_row[col + 1]
                    and this_row[col + 4]
                    and not this_row[col + 5]
                    and this_row[col + 6]
                    and not this_row[col + 9]
                and (
                        this_row[col + 0]
                    and this_row[col + 2]
                    and this_row[col + 3]
                    and not this_row[col + 7]
                    and not this_row[col + 8]
                    and not this_row[col + 10]
                or
                        not this_row[col + 0]
                    and not this_row[col + 2]
                    and not this_row[col + 3]
                    and this_row[col + 7]
                    and this_row[col + 8]
                    and this_row[col + 10]
                    )
                ):
                lost_point += 40
# horspool algorithm.
# if this_row[col + 10] == True,  pattern1 shift 4, pattern2 shift 2. So min=2.
# if this_row[col + 10] == False, pattern1 shift 1, pattern2 shift 1. So min=1.
            if this_row[col + 10]:
                try:
                    next(modules_range_short_iter)
                except StopIteration:
                    pass

    for col in modules_range:
        modules_range_short_iter = iter(modules_range_short)
        row = 0
        for row in modules_range_short_iter:
            if (
                        not modules[row + 1][col]
                    and modules[row + 4][col]
                    and not modules[row + 5][col]
                    and modules[row + 6][col]
                    and not modules[row + 9][col]
                and (
                        modules[row + 0][col]
                    and modules[row + 2][col]
                    and modules[row + 3][col]
                    and not modules[row + 7][col]
                    and not modules[row + 8][col]
                    and not modules[row + 10][col]
                or
                        not modules[row + 0][col]
                    and not modules[row + 2][col]
                    and not modules[row + 3][col]
                    and modules[row + 7][col]
                    and modules[row + 8][col]
                    and modules[row + 10][col]
                    )
                ):
                lost_point += 40
            if modules[row + 10][col]:
                try:
                    next(modules_range_short_iter)
                except StopIteration:
                    pass

    return lost_point


def _lost_point_level4(modules, modules_count):
    dark_count = sum(map(sum, modules))
    percent = float(dark_count) / (modules_count**2)
    # Every 5% departure from 50%, rating++
    rating = int(abs(percent * 100 - 50) / 5)
    return rating * 10


def optimal_data_chunks(data, minimum=4):
    """
    An iterator returning QRData chunks optimized to the data content.

    :param minimum: The minimum number of bytes in a row to split as a chunk.
    """
    data = to_bytestring(data)
    num_pattern = re.compile(b'\d?'*minimum)
    num_bits = _optimal_split(data, num_pattern)
    alpha_pattern = re.compile( b"("+
        (b'[' + ALPHA_NUM + b']?') * minimum + b")")
    for is_num, chunk in num_bits:
        if is_num:
            yield QRData(chunk, mode=MODE_NUMBER, check_data=False)
        else:
            for is_alpha, sub_chunk in _optimal_split(chunk, alpha_pattern):
                if is_alpha:
                    mode = MODE_ALPHA_NUM
                else:
                    mode = MODE_8BIT_BYTE
                yield QRData(sub_chunk, mode=mode, check_data=False)


def _optimal_split(data, pattern):
    while data:
        #match = re.search(pattern), data)
        match = pattern.search(data)
        if not match:
            break
        matched = match.group(0)
        start = data.rfind(matched)
        end = len(matched) + start
        #start, end = match.start(), match.end()
        if start:
            yield False, data[:start]
        yield True, data[start:end]
        data = data[end:]
    if data:
        yield False, data


def to_bytestring(data):
    """
    Convert data to a (utf-8 encoded) byte-string if it isn't a byte-string
    already.
    """
    if not isinstance(data, bytes):
        data = str(data).encode('utf-8')
    return data


def optimal_mode(data):
    """
    Calculate the optimal mode for this chunk of data.
    """
    if data.isdigit():
        return MODE_NUMBER

    if all(b in ALPHA_NUM for b in data):
        return MODE_ALPHA_NUM
    return MODE_8BIT_BYTE


class QRData:
    """
    Data held in a QR compatible format.

    Doesn't currently handle KANJI.
    """

    def __init__(self, data, mode=None, check_data=True):
        """
        If ``mode`` isn't provided, the most compact QR data type possible is
        chosen.
        """
        if check_data:
            data = to_bytestring(data)

        if mode is None:
            self.mode = optimal_mode(data)
        else:
            self.mode = mode
            if mode not in (MODE_NUMBER, MODE_ALPHA_NUM, MODE_8BIT_BYTE):
                raise TypeError("Invalid mode (%s)" % mode)  # pragma: no cover
            if check_data and mode < optimal_mode(data):  # pragma: no cover
                raise ValueError(
                    "Provided data can not be represented in mode "
                    "{0}".format(mode))

        self.data = data

    def __len__(self):
        return len(self.data)

    def write(self, buffer):
        if self.mode == MODE_NUMBER:
            for i in range(0, len(self.data), 3):
                chars = self.data[i:i + 3]
                bit_length = NUMBER_LENGTH[len(chars)]
                buffer.put(int(chars), bit_length)
        elif self.mode == MODE_ALPHA_NUM:
            for i in range(0, len(self.data), 2):
                chars = self.data[i:i + 2]
                if len(chars) > 1:
                    buffer.put(
                        ALPHA_NUM.find(chars[0]) * 45 +
                        ALPHA_NUM.find(chars[1]), 11)
                else:
                    buffer.put(ALPHA_NUM.find(chars), 6)
        else:
            data = self.data
            for c in data:
                buffer.put(c, 8)

    def __repr__(self):
        return repr(self.data)


class BitBuffer:

    def __init__(self):
        self.buffer = []
        self.length = 0

    def __repr__(self):
        return ".".join([str(n) for n in self.buffer])

    def get(self, index):
        buf_index = int(index / 8)
        return ((self.buffer[buf_index] >> (7 - index % 8)) & 1) == 1

    def put(self, num, length):
        for i in range(length):
            self.put_bit(((num >> (length - i - 1)) & 1) == 1)

    def __len__(self):
        return self.length

    def put_bit(self, bit):
        buf_index = self.length // 8
        if len(self.buffer) <= buf_index:
            self.buffer.append(0)
        if bit:
            self.buffer[buf_index] |= (0x80 >> (self.length % 8))
        self.length += 1


def create_bytes(buffer, rs_blocks):
    offset = 0

    maxDcCount = 0
    maxEcCount = 0

    dcdata = [0] * len(rs_blocks)
    ecdata = [0] * len(rs_blocks)

    for r in range(len(rs_blocks)):

        dcCount = rs_blocks[r].data_count
        ecCount = rs_blocks[r].total_count - dcCount

        maxDcCount = max(maxDcCount, dcCount)
        maxEcCount = max(maxEcCount, ecCount)

        dcdata[r] = [0] * dcCount

        for i in range(len(dcdata[r])):
            dcdata[r][i] = 0xff & buffer.buffer[i + offset]
        offset += dcCount

        # Get error correction polynomial.
        if ecCount in rsPoly_LUT:
            rsPoly = Polynomial(rsPoly_LUT[ecCount], 0)
        else:
            rsPoly = Polynomial([1], 0)
            for i in range(ecCount):
                rsPoly = rsPoly * Polynomial([1, gexp(i)], 0)

        rawPoly = Polynomial(dcdata[r], len(rsPoly) - 1)

        modPoly = rawPoly % rsPoly
        ecdata[r] = [0] * (len(rsPoly) - 1)
        for i in range(len(ecdata[r])):
            modIndex = i + len(modPoly) - len(ecdata[r])
            if (modIndex >= 0):
                ecdata[r][i] = modPoly[modIndex]
            else:
                ecdata[r][i] = 0

    totalCodeCount = 0
    for rs_block in rs_blocks:
        totalCodeCount += rs_block.total_count

    data = [None] * totalCodeCount
    index = 0

    for i in range(maxDcCount):
        for r in range(len(rs_blocks)):
            if i < len(dcdata[r]):
                data[index] = dcdata[r][i]
                index += 1

    for i in range(maxEcCount):
        for r in range(len(rs_blocks)):
            if i < len(ecdata[r]):
                data[index] = ecdata[r][i]
                index += 1

    return data


def create_data(version, error_correction, data_list):

    buffer = BitBuffer()
    for data in data_list:
        buffer.put(data.mode, 4)
        buffer.put(len(data), length_in_bits(data.mode, version))
        data.write(buffer)

    # Calculate the maximum number of bits for the given version.
    rs_blocks = make_rs_blocks(version, error_correction)
    bit_limit = 0
    for block in rs_blocks:
        bit_limit += block.data_count * 8

    if len(buffer) > bit_limit:
        raise exceptions.DataOverflowError(
            "Code length overflow. Data size (%s) > size available (%s)" %
            (len(buffer), bit_limit))

    # Terminate the bits (add up to four 0s).
    for i in range(min(bit_limit - len(buffer), 4)):
        buffer.put_bit(False)

    # Delimit the string into 8-bit words, padding with 0s if necessary.
    delimit = len(buffer) % 8
    if delimit:
        for i in range(8 - delimit):
            buffer.put_bit(False)

    # Add special alternating padding bitstrings until buffer is full.
    bytes_to_fill = (bit_limit - len(buffer)) // 8
    for i in range(bytes_to_fill):
        if i % 2 == 0:
            buffer.put(PAD0, 8)
        else:
            buffer.put(PAD1, 8)

    return create_bytes(buffer, rs_blocks)


"""
Main

Formerly in main.py
"""

def make(data=None, **kwargs):
    qr = QRCode(**kwargs)
    qr.add_data(data)
    return qr.get_matrix()


def _check_version(version):
    if version < 1 or version > 40:
        raise ValueError(
            "Invalid version (was %s, expected 1 to 40)" % version)


def _check_box_size(size):
    if int(size) <= 0:
        raise ValueError(
            "Invalid box size (was %s, expected larger than 0)" % size)


def _check_mask_pattern(mask_pattern):
    if mask_pattern is None:
        return
    if not isinstance(mask_pattern, int):
        raise TypeError(
            "Invalid mask pattern (was %s, expected int)" % type(mask_pattern))
    if mask_pattern < 0 or mask_pattern > 7:
        raise ValueError(
            "Mask pattern should be in range(8) (got %s)" % mask_pattern)

class QRCode:

...

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