qrcoder/src/qrrsblock.js

QRCoder is *a pure browser qrcode generation* which is standalone. It is based on a <a href='http://www.d-project.com/qrcode/index.html'>library</a> which build qrcode in various language.

import { QRErrorCorrectionLevel } from './constant'

const RS_BLOCK_TABLE = [

  // L
  // M
  // Q
  // H

  // 1
  [1, 26, 19],
  [1, 26, 16],
  [1, 26, 13],
  [1, 26, 9],

  // 2
  [1, 44, 34],
  [1, 44, 28],
  [1, 44, 22],
  [1, 44, 16],

  // 3
  [1, 70, 55],
  [1, 70, 44],
  [2, 35, 17],
  [2, 35, 13],

  // 4
  [1, 100, 80],
  [2, 50, 32],
  [2, 50, 24],
  [4, 25, 9],

  // 5
  [1, 134, 108],
  [2, 67, 43],
  [2, 33, 15, 2, 34, 16],
  [2, 33, 11, 2, 34, 12],

  // 6
  [2, 86, 68],
  [4, 43, 27],
  [4, 43, 19],
  [4, 43, 15],

  // 7
  [2, 98, 78],
  [4, 49, 31],
  [2, 32, 14, 4, 33, 15],
  [4, 39, 13, 1, 40, 14],

  // 8
  [2, 121, 97],
  [2, 60, 38, 2, 61, 39],
  [4, 40, 18, 2, 41, 19],
  [4, 40, 14, 2, 41, 15],

  // 9
  [2, 146, 116],
  [3, 58, 36, 2, 59, 37],
  [4, 36, 16, 4, 37, 17],
  [4, 36, 12, 4, 37, 13],

  // 10
  [2, 86, 68, 2, 87, 69],
  [4, 69, 43, 1, 70, 44],
  [6, 43, 19, 2, 44, 20],
  [6, 43, 15, 2, 44, 16],

  // 11
  [4, 101, 81],
  [1, 80, 50, 4, 81, 51],
  [4, 50, 22, 4, 51, 23],
  [3, 36, 12, 8, 37, 13],

  // 12
  [2, 116, 92, 2, 117, 93],
  [6, 58, 36, 2, 59, 37],
  [4, 46, 20, 6, 47, 21],
  [7, 42, 14, 4, 43, 15],

  // 13
  [4, 133, 107],
  [8, 59, 37, 1, 60, 38],
  [8, 44, 20, 4, 45, 21],
  [12, 33, 11, 4, 34, 12],

  // 14
  [3, 145, 115, 1, 146, 116],
  [4, 64, 40, 5, 65, 41],
  [11, 36, 16, 5, 37, 17],
  [11, 36, 12, 5, 37, 13],

  // 15
  [5, 109, 87, 1, 110, 88],
  [5, 65, 41, 5, 66, 42],
  [5, 54, 24, 7, 55, 25],
  [11, 36, 12, 7, 37, 13],

  // 16
  [5, 122, 98, 1, 123, 99],
  [7, 73, 45, 3, 74, 46],
  [15, 43, 19, 2, 44, 20],
  [3, 45, 15, 13, 46, 16],

  // 17
  [1, 135, 107, 5, 136, 108],
  [10, 74, 46, 1, 75, 47],
  [1, 50, 22, 15, 51, 23],
  [2, 42, 14, 17, 43, 15],

  // 18
  [5, 150, 120, 1, 151, 121],
  [9, 69, 43, 4, 70, 44],
  [17, 50, 22, 1, 51, 23],
  [2, 42, 14, 19, 43, 15],

  // 19
  [3, 141, 113, 4, 142, 114],
  [3, 70, 44, 11, 71, 45],
  [17, 47, 21, 4, 48, 22],
  [9, 39, 13, 16, 40, 14],

  // 20
  [3, 135, 107, 5, 136, 108],
  [3, 67, 41, 13, 68, 42],
  [15, 54, 24, 5, 55, 25],
  [15, 43, 15, 10, 44, 16],

  // 21
  [4, 144, 116, 4, 145, 117],
  [17, 68, 42],
  [17, 50, 22, 6, 51, 23],
  [19, 46, 16, 6, 47, 17],

  // 22
  [2, 139, 111, 7, 140, 112],
  [17, 74, 46],
  [7, 54, 24, 16, 55, 25],
  [34, 37, 13],

  // 23
  [4, 151, 121, 5, 152, 122],
  [4, 75, 47, 14, 76, 48],
  [11, 54, 24, 14, 55, 25],
  [16, 45, 15, 14, 46, 16],

  // 24
  [6, 147, 117, 4, 148, 118],
  [6, 73, 45, 14, 74, 46],
  [11, 54, 24, 16, 55, 25],
  [30, 46, 16, 2, 47, 17],

  // 25
  [8, 132, 106, 4, 133, 107],
  [8, 75, 47, 13, 76, 48],
  [7, 54, 24, 22, 55, 25],
  [22, 45, 15, 13, 46, 16],

  // 26
  [10, 142, 114, 2, 143, 115],
  [19, 74, 46, 4, 75, 47],
  [28, 50, 22, 6, 51, 23],
  [33, 46, 16, 4, 47, 17],

  // 27
  [8, 152, 122, 4, 153, 123],
  [22, 73, 45, 3, 74, 46],
  [8, 53, 23, 26, 54, 24],
  [12, 45, 15, 28, 46, 16],

  // 28
  [3, 147, 117, 10, 148, 118],
  [3, 73, 45, 23, 74, 46],
  [4, 54, 24, 31, 55, 25],
  [11, 45, 15, 31, 46, 16],

  // 29
  [7, 146, 116, 7, 147, 117],
  [21, 73, 45, 7, 74, 46],
  [1, 53, 23, 37, 54, 24],
  [19, 45, 15, 26, 46, 16],

  // 30
  [5, 145, 115, 10, 146, 116],
  [19, 75, 47, 10, 76, 48],
  [15, 54, 24, 25, 55, 25],
  [23, 45, 15, 25, 46, 16],

  // 31
  [13, 145, 115, 3, 146, 116],
  [2, 74, 46, 29, 75, 47],
  [42, 54, 24, 1, 55, 25],
  [23, 45, 15, 28, 46, 16],

  // 32
  [17, 145, 115],
  [10, 74, 46, 23, 75, 47],
  [10, 54, 24, 35, 55, 25],
  [19, 45, 15, 35, 46, 16],

  // 33
  [17, 145, 115, 1, 146, 116],
  [14, 74, 46, 21, 75, 47],
  [29, 54, 24, 19, 55, 25],
  [11, 45, 15, 46, 46, 16],

  // 34
  [13, 145, 115, 6, 146, 116],
  [14, 74, 46, 23, 75, 47],
  [44, 54, 24, 7, 55, 25],
  [59, 46, 16, 1, 47, 17],

  // 35
  [12, 151, 121, 7, 152, 122],
  [12, 75, 47, 26, 76, 48],
  [39, 54, 24, 14, 55, 25],
  [22, 45, 15, 41, 46, 16],

  // 36
  [6, 151, 121, 14, 152, 122],
  [6, 75, 47, 34, 76, 48],
  [46, 54, 24, 10, 55, 25],
  [2, 45, 15, 64, 46, 16],

  // 37
  [17, 152, 122, 4, 153, 123],
  [29, 74, 46, 14, 75, 47],
  [49, 54, 24, 10, 55, 25],
  [24, 45, 15, 46, 46, 16],

  // 38
  [4, 152, 122, 18, 153, 123],
  [13, 74, 46, 32, 75, 47],
  [48, 54, 24, 14, 55, 25],
  [42, 45, 15, 32, 46, 16],

  // 39
  [20, 147, 117, 4, 148, 118],
  [40, 75, 47, 7, 76, 48],
  [43, 54, 24, 22, 55, 25],
  [10, 45, 15, 67, 46, 16],

  // 40
  [19, 148, 118, 6, 149, 119],
  [18, 75, 47, 31, 76, 48],
  [34, 54, 24, 34, 55, 25],
  [20, 45, 15, 61, 46, 16]
]

function Qrrsblock (totalCount, dataCount) {
  this.totalCount = totalCount
  this.dataCount = dataCount
}

function getRsBlockTable (typeNumber, errorCorrectionLevel) {
  switch (errorCorrectionLevel) {
    case QRErrorCorrectionLevel.L:
      return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 0]
    case QRErrorCorrectionLevel.M:
      return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 1]
    case QRErrorCorrectionLevel.Q:
      return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 2]
    case QRErrorCorrectionLevel.H:
      return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 3]
    default :
      return undefined
  }
}

export const QRRSBlock = {
  getRSBlocks: function (typeNumber, errorCorrectionLevel) {
    let rsBlock = getRsBlockTable(typeNumber, errorCorrectionLevel)
    if (typeof rsBlock === 'undefined') {
      throw new Error('bad rs block @ typeNumber:' + typeNumber +
          '/errorCorrectionLevel:' + errorCorrectionLevel)
    }

    let length = rsBlock.length / 3
    const list = []

    for (let i = 0; i < length; i += 1) {
      let count = rsBlock[i * 3 + 0]
      let totalCount = rsBlock[i * 3 + 1]
      let dataCount = rsBlock[i * 3 + 2]

      for (let j = 0; j < count; j += 1) {
        list.push(new Qrrsblock(totalCount, dataCount))
      }
    }

    return list
  }
}