Add extracted source directory and README navigation

extracted-source/node_modules/qrcode/lib/browser.js

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+
+const canPromise = require('./can-promise')
+
+const QRCode = require('./core/qrcode')
+const CanvasRenderer = require('./renderer/canvas')
+const SvgRenderer = require('./renderer/svg-tag.js')
+
+function renderCanvas (renderFunc, canvas, text, opts, cb) {
+  const args = [].slice.call(arguments, 1)
+  const argsNum = args.length
+  const isLastArgCb = typeof args[argsNum - 1] === 'function'
+
+  if (!isLastArgCb && !canPromise()) {
+    throw new Error('Callback required as last argument')
+  }
+
+  if (isLastArgCb) {
+    if (argsNum < 2) {
+      throw new Error('Too few arguments provided')
+    }
+
+    if (argsNum === 2) {
+      cb = text
+      text = canvas
+      canvas = opts = undefined
+    } else if (argsNum === 3) {
+      if (canvas.getContext && typeof cb === 'undefined') {
+        cb = opts
+        opts = undefined
+      } else {
+        cb = opts
+        opts = text
+        text = canvas
+        canvas = undefined
+      }
+    }
+  } else {
+    if (argsNum < 1) {
+      throw new Error('Too few arguments provided')
+    }
+
+    if (argsNum === 1) {
+      text = canvas
+      canvas = opts = undefined
+    } else if (argsNum === 2 && !canvas.getContext) {
+      opts = text
+      text = canvas
+      canvas = undefined
+    }
+
+    return new Promise(function (resolve, reject) {
+      try {
+        const data = QRCode.create(text, opts)
+        resolve(renderFunc(data, canvas, opts))
+      } catch (e) {
+        reject(e)
+      }
+    })
+  }
+
+  try {
+    const data = QRCode.create(text, opts)
+    cb(null, renderFunc(data, canvas, opts))
+  } catch (e) {
+    cb(e)
+  }
+}
+
+exports.create = QRCode.create
+exports.toCanvas = renderCanvas.bind(null, CanvasRenderer.render)
+exports.toDataURL = renderCanvas.bind(null, CanvasRenderer.renderToDataURL)
+
+// only svg for now.
+exports.toString = renderCanvas.bind(null, function (data, _, opts) {
+  return SvgRenderer.render(data, opts)
+})

extracted-source/node_modules/qrcode/lib/can-promise.js

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+// can-promise has a crash in some versions of react native that dont have
+// standard global objects
+// https://github.com/soldair/node-qrcode/issues/157
+
+module.exports = function () {
+  return typeof Promise === 'function' && Promise.prototype && Promise.prototype.then
+}

extracted-source/node_modules/qrcode/lib/core/alignment-pattern.js

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+/**
+ * Alignment pattern are fixed reference pattern in defined positions
+ * in a matrix symbology, which enables the decode software to re-synchronise
+ * the coordinate mapping of the image modules in the event of moderate amounts
+ * of distortion of the image.
+ *
+ * Alignment patterns are present only in QR Code symbols of version 2 or larger
+ * and their number depends on the symbol version.
+ */
+
+const getSymbolSize = require('./utils').getSymbolSize
+
+/**
+ * Calculate the row/column coordinates of the center module of each alignment pattern
+ * for the specified QR Code version.
+ *
+ * The alignment patterns are positioned symmetrically on either side of the diagonal
+ * running from the top left corner of the symbol to the bottom right corner.
+ *
+ * Since positions are simmetrical only half of the coordinates are returned.
+ * Each item of the array will represent in turn the x and y coordinate.
+ * @see {@link getPositions}
+ *
+ * @param  {Number} version QR Code version
+ * @return {Array}          Array of coordinate
+ */
+exports.getRowColCoords = function getRowColCoords (version) {
+  if (version === 1) return []
+
+  const posCount = Math.floor(version / 7) + 2
+  const size = getSymbolSize(version)
+  const intervals = size === 145 ? 26 : Math.ceil((size - 13) / (2 * posCount - 2)) * 2
+  const positions = [size - 7] // Last coord is always (size - 7)
+
+  for (let i = 1; i < posCount - 1; i++) {
+    positions[i] = positions[i - 1] - intervals
+  }
+
+  positions.push(6) // First coord is always 6
+
+  return positions.reverse()
+}
+
+/**
+ * Returns an array containing the positions of each alignment pattern.
+ * Each array's element represent the center point of the pattern as (x, y) coordinates
+ *
+ * Coordinates are calculated expanding the row/column coordinates returned by {@link getRowColCoords}
+ * and filtering out the items that overlaps with finder pattern
+ *
+ * @example
+ * For a Version 7 symbol {@link getRowColCoords} returns values 6, 22 and 38.
+ * The alignment patterns, therefore, are to be centered on (row, column)
+ * positions (6,22), (22,6), (22,22), (22,38), (38,22), (38,38).
+ * Note that the coordinates (6,6), (6,38), (38,6) are occupied by finder patterns
+ * and are not therefore used for alignment patterns.
+ *
+ * let pos = getPositions(7)
+ * // [[6,22], [22,6], [22,22], [22,38], [38,22], [38,38]]
+ *
+ * @param  {Number} version QR Code version
+ * @return {Array}          Array of coordinates
+ */
+exports.getPositions = function getPositions (version) {
+  const coords = []
+  const pos = exports.getRowColCoords(version)
+  const posLength = pos.length
+
+  for (let i = 0; i < posLength; i++) {
+    for (let j = 0; j < posLength; j++) {
+      // Skip if position is occupied by finder patterns
+      if ((i === 0 && j === 0) || // top-left
+          (i === 0 && j === posLength - 1) || // bottom-left
+          (i === posLength - 1 && j === 0)) { // top-right
+        continue
+      }
+
+      coords.push([pos[i], pos[j]])
+    }
+  }
+
+  return coords
+}

extracted-source/node_modules/qrcode/lib/core/alphanumeric-data.js

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+const Mode = require('./mode')
+
+/**
+ * Array of characters available in alphanumeric mode
+ *
+ * As per QR Code specification, to each character
+ * is assigned a value from 0 to 44 which in this case coincides
+ * with the array index
+ *
+ * @type {Array}
+ */
+const ALPHA_NUM_CHARS = [
+  '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+  'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
+  'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
+  ' ', '$', '%', '*', '+', '-', '.', '/', ':'
+]
+
+function AlphanumericData (data) {
+  this.mode = Mode.ALPHANUMERIC
+  this.data = data
+}
+
+AlphanumericData.getBitsLength = function getBitsLength (length) {
+  return 11 * Math.floor(length / 2) + 6 * (length % 2)
+}
+
+AlphanumericData.prototype.getLength = function getLength () {
+  return this.data.length
+}
+
+AlphanumericData.prototype.getBitsLength = function getBitsLength () {
+  return AlphanumericData.getBitsLength(this.data.length)
+}
+
+AlphanumericData.prototype.write = function write (bitBuffer) {
+  let i
+
+  // Input data characters are divided into groups of two characters
+  // and encoded as 11-bit binary codes.
+  for (i = 0; i + 2 <= this.data.length; i += 2) {
+    // The character value of the first character is multiplied by 45
+    let value = ALPHA_NUM_CHARS.indexOf(this.data[i]) * 45
+
+    // The character value of the second digit is added to the product
+    value += ALPHA_NUM_CHARS.indexOf(this.data[i + 1])
+
+    // The sum is then stored as 11-bit binary number
+    bitBuffer.put(value, 11)
+  }
+
+  // If the number of input data characters is not a multiple of two,
+  // the character value of the final character is encoded as a 6-bit binary number.
+  if (this.data.length % 2) {
+    bitBuffer.put(ALPHA_NUM_CHARS.indexOf(this.data[i]), 6)
+  }
+}
+
+module.exports = AlphanumericData

extracted-source/node_modules/qrcode/lib/core/bit-buffer.js

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+function BitBuffer () {
+  this.buffer = []
+  this.length = 0
+}
+
+BitBuffer.prototype = {
+
+  get: function (index) {
+    const bufIndex = Math.floor(index / 8)
+    return ((this.buffer[bufIndex] >>> (7 - index % 8)) & 1) === 1
+  },
+
+  put: function (num, length) {
+    for (let i = 0; i < length; i++) {
+      this.putBit(((num >>> (length - i - 1)) & 1) === 1)
+    }
+  },
+
+  getLengthInBits: function () {
+    return this.length
+  },
+
+  putBit: function (bit) {
+    const bufIndex = Math.floor(this.length / 8)
+    if (this.buffer.length <= bufIndex) {
+      this.buffer.push(0)
+    }
+
+    if (bit) {
+      this.buffer[bufIndex] |= (0x80 >>> (this.length % 8))
+    }
+
+    this.length++
+  }
+}
+
+module.exports = BitBuffer

extracted-source/node_modules/qrcode/lib/core/bit-matrix.js

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+/**
+ * Helper class to handle QR Code symbol modules
+ *
+ * @param {Number} size Symbol size
+ */
+function BitMatrix (size) {
+  if (!size || size < 1) {
+    throw new Error('BitMatrix size must be defined and greater than 0')
+  }
+
+  this.size = size
+  this.data = new Uint8Array(size * size)
+  this.reservedBit = new Uint8Array(size * size)
+}
+
+/**
+ * Set bit value at specified location
+ * If reserved flag is set, this bit will be ignored during masking process
+ *
+ * @param {Number}  row
+ * @param {Number}  col
+ * @param {Boolean} value
+ * @param {Boolean} reserved
+ */
+BitMatrix.prototype.set = function (row, col, value, reserved) {
+  const index = row * this.size + col
+  this.data[index] = value
+  if (reserved) this.reservedBit[index] = true
+}
+
+/**
+ * Returns bit value at specified location
+ *
+ * @param  {Number}  row
+ * @param  {Number}  col
+ * @return {Boolean}
+ */
+BitMatrix.prototype.get = function (row, col) {
+  return this.data[row * this.size + col]
+}
+
+/**
+ * Applies xor operator at specified location
+ * (used during masking process)
+ *
+ * @param {Number}  row
+ * @param {Number}  col
+ * @param {Boolean} value
+ */
+BitMatrix.prototype.xor = function (row, col, value) {
+  this.data[row * this.size + col] ^= value
+}
+
+/**
+ * Check if bit at specified location is reserved
+ *
+ * @param {Number}   row
+ * @param {Number}   col
+ * @return {Boolean}
+ */
+BitMatrix.prototype.isReserved = function (row, col) {
+  return this.reservedBit[row * this.size + col]
+}
+
+module.exports = BitMatrix

extracted-source/node_modules/qrcode/lib/core/byte-data.js

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+const Mode = require('./mode')
+
+function ByteData (data) {
+  this.mode = Mode.BYTE
+  if (typeof (data) === 'string') {
+    this.data = new TextEncoder().encode(data)
+  } else {
+    this.data = new Uint8Array(data)
+  }
+}
+
+ByteData.getBitsLength = function getBitsLength (length) {
+  return length * 8
+}
+
+ByteData.prototype.getLength = function getLength () {
+  return this.data.length
+}
+
+ByteData.prototype.getBitsLength = function getBitsLength () {
+  return ByteData.getBitsLength(this.data.length)
+}
+
+ByteData.prototype.write = function (bitBuffer) {
+  for (let i = 0, l = this.data.length; i < l; i++) {
+    bitBuffer.put(this.data[i], 8)
+  }
+}
+
+module.exports = ByteData

extracted-source/node_modules/qrcode/lib/core/error-correction-code.js

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+const ECLevel = require('./error-correction-level')
+
+const EC_BLOCKS_TABLE = [
+// L  M  Q  H
+  1, 1, 1, 1,
+  1, 1, 1, 1,
+  1, 1, 2, 2,
+  1, 2, 2, 4,
+  1, 2, 4, 4,
+  2, 4, 4, 4,
+  2, 4, 6, 5,
+  2, 4, 6, 6,
+  2, 5, 8, 8,
+  4, 5, 8, 8,
+  4, 5, 8, 11,
+  4, 8, 10, 11,
+  4, 9, 12, 16,
+  4, 9, 16, 16,
+  6, 10, 12, 18,
+  6, 10, 17, 16,
+  6, 11, 16, 19,
+  6, 13, 18, 21,
+  7, 14, 21, 25,
+  8, 16, 20, 25,
+  8, 17, 23, 25,
+  9, 17, 23, 34,
+  9, 18, 25, 30,
+  10, 20, 27, 32,
+  12, 21, 29, 35,
+  12, 23, 34, 37,
+  12, 25, 34, 40,
+  13, 26, 35, 42,
+  14, 28, 38, 45,
+  15, 29, 40, 48,
+  16, 31, 43, 51,
+  17, 33, 45, 54,
+  18, 35, 48, 57,
+  19, 37, 51, 60,
+  19, 38, 53, 63,
+  20, 40, 56, 66,
+  21, 43, 59, 70,
+  22, 45, 62, 74,
+  24, 47, 65, 77,
+  25, 49, 68, 81
+]
+
+const EC_CODEWORDS_TABLE = [
+// L  M  Q  H
+  7, 10, 13, 17,
+  10, 16, 22, 28,
+  15, 26, 36, 44,
+  20, 36, 52, 64,
+  26, 48, 72, 88,
+  36, 64, 96, 112,
+  40, 72, 108, 130,
+  48, 88, 132, 156,
+  60, 110, 160, 192,
+  72, 130, 192, 224,
+  80, 150, 224, 264,
+  96, 176, 260, 308,
+  104, 198, 288, 352,
+  120, 216, 320, 384,
+  132, 240, 360, 432,
+  144, 280, 408, 480,
+  168, 308, 448, 532,
+  180, 338, 504, 588,
+  196, 364, 546, 650,
+  224, 416, 600, 700,
+  224, 442, 644, 750,
+  252, 476, 690, 816,
+  270, 504, 750, 900,
+  300, 560, 810, 960,
+  312, 588, 870, 1050,
+  336, 644, 952, 1110,
+  360, 700, 1020, 1200,
+  390, 728, 1050, 1260,
+  420, 784, 1140, 1350,
+  450, 812, 1200, 1440,
+  480, 868, 1290, 1530,
+  510, 924, 1350, 1620,
+  540, 980, 1440, 1710,
+  570, 1036, 1530, 1800,
+  570, 1064, 1590, 1890,
+  600, 1120, 1680, 1980,
+  630, 1204, 1770, 2100,
+  660, 1260, 1860, 2220,
+  720, 1316, 1950, 2310,
+  750, 1372, 2040, 2430
+]
+
+/**
+ * Returns the number of error correction block that the QR Code should contain
+ * for the specified version and error correction level.
+ *
+ * @param  {Number} version              QR Code version
+ * @param  {Number} errorCorrectionLevel Error correction level
+ * @return {Number}                      Number of error correction blocks
+ */
+exports.getBlocksCount = function getBlocksCount (version, errorCorrectionLevel) {
+  switch (errorCorrectionLevel) {
+    case ECLevel.L:
+      return EC_BLOCKS_TABLE[(version - 1) * 4 + 0]
+    case ECLevel.M:
+      return EC_BLOCKS_TABLE[(version - 1) * 4 + 1]
+    case ECLevel.Q:
+      return EC_BLOCKS_TABLE[(version - 1) * 4 + 2]
+    case ECLevel.H:
+      return EC_BLOCKS_TABLE[(version - 1) * 4 + 3]
+    default:
+      return undefined
+  }
+}
+
+/**
+ * Returns the number of error correction codewords to use for the specified
+ * version and error correction level.
+ *
+ * @param  {Number} version              QR Code version
+ * @param  {Number} errorCorrectionLevel Error correction level
+ * @return {Number}                      Number of error correction codewords
+ */
+exports.getTotalCodewordsCount = function getTotalCodewordsCount (version, errorCorrectionLevel) {
+  switch (errorCorrectionLevel) {
+    case ECLevel.L:
+      return EC_CODEWORDS_TABLE[(version - 1) * 4 + 0]
+    case ECLevel.M:
+      return EC_CODEWORDS_TABLE[(version - 1) * 4 + 1]
+    case ECLevel.Q:
+      return EC_CODEWORDS_TABLE[(version - 1) * 4 + 2]
+    case ECLevel.H:
+      return EC_CODEWORDS_TABLE[(version - 1) * 4 + 3]
+    default:
+      return undefined
+  }
+}

extracted-source/node_modules/qrcode/lib/core/error-correction-level.js

@@ -0,0 +1,50 @@
+exports.L = { bit: 1 }
+exports.M = { bit: 0 }
+exports.Q = { bit: 3 }
+exports.H = { bit: 2 }
+
+function fromString (string) {
+  if (typeof string !== 'string') {
+    throw new Error('Param is not a string')
+  }
+
+  const lcStr = string.toLowerCase()
+
+  switch (lcStr) {
+    case 'l':
+    case 'low':
+      return exports.L
+
+    case 'm':
+    case 'medium':
+      return exports.M
+
+    case 'q':
+    case 'quartile':
+      return exports.Q
+
+    case 'h':
+    case 'high':
+      return exports.H
+
+    default:
+      throw new Error('Unknown EC Level: ' + string)
+  }
+}
+
+exports.isValid = function isValid (level) {
+  return level && typeof level.bit !== 'undefined' &&
+    level.bit >= 0 && level.bit < 4
+}
+
+exports.from = function from (value, defaultValue) {
+  if (exports.isValid(value)) {
+    return value
+  }
+
+  try {
+    return fromString(value)
+  } catch (e) {
+    return defaultValue
+  }
+}

extracted-source/node_modules/qrcode/lib/core/finder-pattern.js

@@ -0,0 +1,22 @@
+const getSymbolSize = require('./utils').getSymbolSize
+const FINDER_PATTERN_SIZE = 7
+
+/**
+ * Returns an array containing the positions of each finder pattern.
+ * Each array's element represent the top-left point of the pattern as (x, y) coordinates
+ *
+ * @param  {Number} version QR Code version
+ * @return {Array}          Array of coordinates
+ */
+exports.getPositions = function getPositions (version) {
+  const size = getSymbolSize(version)
+
+  return [
+    // top-left
+    [0, 0],
+    // top-right
+    [size - FINDER_PATTERN_SIZE, 0],
+    // bottom-left
+    [0, size - FINDER_PATTERN_SIZE]
+  ]
+}

extracted-source/node_modules/qrcode/lib/core/format-info.js

@@ -0,0 +1,29 @@
+const Utils = require('./utils')
+
+const G15 = (1 << 10) | (1 << 8) | (1 << 5) | (1 << 4) | (1 << 2) | (1 << 1) | (1 << 0)
+const G15_MASK = (1 << 14) | (1 << 12) | (1 << 10) | (1 << 4) | (1 << 1)
+const G15_BCH = Utils.getBCHDigit(G15)
+
+/**
+ * Returns format information with relative error correction bits
+ *
+ * The format information is a 15-bit sequence containing 5 data bits,
+ * with 10 error correction bits calculated using the (15, 5) BCH code.
+ *
+ * @param  {Number} errorCorrectionLevel Error correction level
+ * @param  {Number} mask                 Mask pattern
+ * @return {Number}                      Encoded format information bits
+ */
+exports.getEncodedBits = function getEncodedBits (errorCorrectionLevel, mask) {
+  const data = ((errorCorrectionLevel.bit << 3) | mask)
+  let d = data << 10
+
+  while (Utils.getBCHDigit(d) - G15_BCH >= 0) {
+    d ^= (G15 << (Utils.getBCHDigit(d) - G15_BCH))
+  }
+
+  // xor final data with mask pattern in order to ensure that
+  // no combination of Error Correction Level and data mask pattern
+  // will result in an all-zero data string
+  return ((data << 10) | d) ^ G15_MASK
+}

extracted-source/node_modules/qrcode/lib/core/galois-field.js

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+const EXP_TABLE = new Uint8Array(512)
+const LOG_TABLE = new Uint8Array(256)
+/**
+ * Precompute the log and anti-log tables for faster computation later
+ *
+ * For each possible value in the galois field 2^8, we will pre-compute
+ * the logarithm and anti-logarithm (exponential) of this value
+ *
+ * ref {@link https://en.wikiversity.org/wiki/Reed%E2%80%93Solomon_codes_for_coders#Introduction_to_mathematical_fields}
+ */
+;(function initTables () {
+  let x = 1
+  for (let i = 0; i < 255; i++) {
+    EXP_TABLE[i] = x
+    LOG_TABLE[x] = i
+
+    x <<= 1 // multiply by 2
+
+    // The QR code specification says to use byte-wise modulo 100011101 arithmetic.
+    // This means that when a number is 256 or larger, it should be XORed with 0x11D.
+    if (x & 0x100) { // similar to x >= 256, but a lot faster (because 0x100 == 256)
+      x ^= 0x11D
+    }
+  }
+
+  // Optimization: double the size of the anti-log table so that we don't need to mod 255 to
+  // stay inside the bounds (because we will mainly use this table for the multiplication of
+  // two GF numbers, no more).
+  // @see {@link mul}
+  for (let i = 255; i < 512; i++) {
+    EXP_TABLE[i] = EXP_TABLE[i - 255]
+  }
+}())
+
+/**
+ * Returns log value of n inside Galois Field
+ *
+ * @param  {Number} n
+ * @return {Number}
+ */
+exports.log = function log (n) {
+  if (n < 1) throw new Error('log(' + n + ')')
+  return LOG_TABLE[n]
+}
+
+/**
+ * Returns anti-log value of n inside Galois Field
+ *
+ * @param  {Number} n
+ * @return {Number}
+ */
+exports.exp = function exp (n) {
+  return EXP_TABLE[n]
+}
+
+/**
+ * Multiplies two number inside Galois Field
+ *
+ * @param  {Number} x
+ * @param  {Number} y
+ * @return {Number}
+ */
+exports.mul = function mul (x, y) {
+  if (x === 0 || y === 0) return 0
+
+  // should be EXP_TABLE[(LOG_TABLE[x] + LOG_TABLE[y]) % 255] if EXP_TABLE wasn't oversized
+  // @see {@link initTables}
+  return EXP_TABLE[LOG_TABLE[x] + LOG_TABLE[y]]
+}

extracted-source/node_modules/qrcode/lib/core/kanji-data.js

@@ -0,0 +1,54 @@
+const Mode = require('./mode')
+const Utils = require('./utils')
+
+function KanjiData (data) {
+  this.mode = Mode.KANJI
+  this.data = data
+}
+
+KanjiData.getBitsLength = function getBitsLength (length) {
+  return length * 13
+}
+
+KanjiData.prototype.getLength = function getLength () {
+  return this.data.length
+}
+
+KanjiData.prototype.getBitsLength = function getBitsLength () {
+  return KanjiData.getBitsLength(this.data.length)
+}
+
+KanjiData.prototype.write = function (bitBuffer) {
+  let i
+
+  // In the Shift JIS system, Kanji characters are represented by a two byte combination.
+  // These byte values are shifted from the JIS X 0208 values.
+  // JIS X 0208 gives details of the shift coded representation.
+  for (i = 0; i < this.data.length; i++) {
+    let value = Utils.toSJIS(this.data[i])
+
+    // For characters with Shift JIS values from 0x8140 to 0x9FFC:
+    if (value >= 0x8140 && value <= 0x9FFC) {
+      // Subtract 0x8140 from Shift JIS value
+      value -= 0x8140
+
+    // For characters with Shift JIS values from 0xE040 to 0xEBBF
+    } else if (value >= 0xE040 && value <= 0xEBBF) {
+      // Subtract 0xC140 from Shift JIS value
+      value -= 0xC140
+    } else {
+      throw new Error(
+        'Invalid SJIS character: ' + this.data[i] + '\n' +
+        'Make sure your charset is UTF-8')
+    }
+
+    // Multiply most significant byte of result by 0xC0
+    // and add least significant byte to product
+    value = (((value >>> 8) & 0xff) * 0xC0) + (value & 0xff)
+
+    // Convert result to a 13-bit binary string
+    bitBuffer.put(value, 13)
+  }
+}
+
+module.exports = KanjiData

extracted-source/node_modules/qrcode/lib/core/mask-pattern.js

@@ -0,0 +1,234 @@
+/**
+ * Data mask pattern reference
+ * @type {Object}
+ */
+exports.Patterns = {
+  PATTERN000: 0,
+  PATTERN001: 1,
+  PATTERN010: 2,
+  PATTERN011: 3,
+  PATTERN100: 4,
+  PATTERN101: 5,
+  PATTERN110: 6,
+  PATTERN111: 7
+}
+
+/**
+ * Weighted penalty scores for the undesirable features
+ * @type {Object}
+ */
+const PenaltyScores = {
+  N1: 3,
+  N2: 3,
+  N3: 40,
+  N4: 10
+}
+
+/**
+ * Check if mask pattern value is valid
+ *
+ * @param  {Number}  mask    Mask pattern
+ * @return {Boolean}         true if valid, false otherwise
+ */
+exports.isValid = function isValid (mask) {
+  return mask != null && mask !== '' && !isNaN(mask) && mask >= 0 && mask <= 7
+}
+
+/**
+ * Returns mask pattern from a value.
+ * If value is not valid, returns undefined
+ *
+ * @param  {Number|String} value        Mask pattern value
+ * @return {Number}                     Valid mask pattern or undefined
+ */
+exports.from = function from (value) {
+  return exports.isValid(value) ? parseInt(value, 10) : undefined
+}
+
+/**
+* Find adjacent modules in row/column with the same color
+* and assign a penalty value.
+*
+* Points: N1 + i
+* i is the amount by which the number of adjacent modules of the same color exceeds 5
+*/
+exports.getPenaltyN1 = function getPenaltyN1 (data) {
+  const size = data.size
+  let points = 0
+  let sameCountCol = 0
+  let sameCountRow = 0
+  let lastCol = null
+  let lastRow = null
+
+  for (let row = 0; row < size; row++) {
+    sameCountCol = sameCountRow = 0
+    lastCol = lastRow = null
+
+    for (let col = 0; col < size; col++) {
+      let module = data.get(row, col)
+      if (module === lastCol) {
+        sameCountCol++
+      } else {
+        if (sameCountCol >= 5) points += PenaltyScores.N1 + (sameCountCol - 5)
+        lastCol = module
+        sameCountCol = 1
+      }
+
+      module = data.get(col, row)
+      if (module === lastRow) {
+        sameCountRow++
+      } else {
+        if (sameCountRow >= 5) points += PenaltyScores.N1 + (sameCountRow - 5)
+        lastRow = module
+        sameCountRow = 1
+      }
+    }
+
+    if (sameCountCol >= 5) points += PenaltyScores.N1 + (sameCountCol - 5)
+    if (sameCountRow >= 5) points += PenaltyScores.N1 + (sameCountRow - 5)
+  }
+
+  return points
+}
+
+/**
+ * Find 2x2 blocks with the same color and assign a penalty value
+ *
+ * Points: N2 * (m - 1) * (n - 1)
+ */
+exports.getPenaltyN2 = function getPenaltyN2 (data) {
+  const size = data.size
+  let points = 0
+
+  for (let row = 0; row < size - 1; row++) {
+    for (let col = 0; col < size - 1; col++) {
+      const last = data.get(row, col) +
+        data.get(row, col + 1) +
+        data.get(row + 1, col) +
+        data.get(row + 1, col + 1)
+
+      if (last === 4 || last === 0) points++
+    }
+  }
+
+  return points * PenaltyScores.N2
+}
+
+/**
+ * Find 1:1:3:1:1 ratio (dark:light:dark:light:dark) pattern in row/column,
+ * preceded or followed by light area 4 modules wide
+ *
+ * Points: N3 * number of pattern found
+ */
+exports.getPenaltyN3 = function getPenaltyN3 (data) {
+  const size = data.size
+  let points = 0
+  let bitsCol = 0
+  let bitsRow = 0
+
+  for (let row = 0; row < size; row++) {
+    bitsCol = bitsRow = 0
+    for (let col = 0; col < size; col++) {
+      bitsCol = ((bitsCol << 1) & 0x7FF) | data.get(row, col)
+      if (col >= 10 && (bitsCol === 0x5D0 || bitsCol === 0x05D)) points++
+
+      bitsRow = ((bitsRow << 1) & 0x7FF) | data.get(col, row)
+      if (col >= 10 && (bitsRow === 0x5D0 || bitsRow === 0x05D)) points++
+    }
+  }
+
+  return points * PenaltyScores.N3
+}
+
+/**
+ * Calculate proportion of dark modules in entire symbol
+ *
+ * Points: N4 * k
+ *
+ * k is the rating of the deviation of the proportion of dark modules
+ * in the symbol from 50% in steps of 5%
+ */
+exports.getPenaltyN4 = function getPenaltyN4 (data) {
+  let darkCount = 0
+  const modulesCount = data.data.length
+
+  for (let i = 0; i < modulesCount; i++) darkCount += data.data[i]
+
+  const k = Math.abs(Math.ceil((darkCount * 100 / modulesCount) / 5) - 10)
+
+  return k * PenaltyScores.N4
+}
+
+/**
+ * Return mask value at given position
+ *
+ * @param  {Number} maskPattern Pattern reference value
+ * @param  {Number} i           Row
+ * @param  {Number} j           Column
+ * @return {Boolean}            Mask value
+ */
+function getMaskAt (maskPattern, i, j) {
+  switch (maskPattern) {
+    case exports.Patterns.PATTERN000: return (i + j) % 2 === 0
+    case exports.Patterns.PATTERN001: return i % 2 === 0
+    case exports.Patterns.PATTERN010: return j % 3 === 0
+    case exports.Patterns.PATTERN011: return (i + j) % 3 === 0
+    case exports.Patterns.PATTERN100: return (Math.floor(i / 2) + Math.floor(j / 3)) % 2 === 0
+    case exports.Patterns.PATTERN101: return (i * j) % 2 + (i * j) % 3 === 0
+    case exports.Patterns.PATTERN110: return ((i * j) % 2 + (i * j) % 3) % 2 === 0
+    case exports.Patterns.PATTERN111: return ((i * j) % 3 + (i + j) % 2) % 2 === 0
+
+    default: throw new Error('bad maskPattern:' + maskPattern)
+  }
+}
+
+/**
+ * Apply a mask pattern to a BitMatrix
+ *
+ * @param  {Number}    pattern Pattern reference number
+ * @param  {BitMatrix} data    BitMatrix data
+ */
+exports.applyMask = function applyMask (pattern, data) {
+  const size = data.size
+
+  for (let col = 0; col < size; col++) {
+    for (let row = 0; row < size; row++) {
+      if (data.isReserved(row, col)) continue
+      data.xor(row, col, getMaskAt(pattern, row, col))
+    }
+  }
+}
+
+/**
+ * Returns the best mask pattern for data
+ *
+ * @param  {BitMatrix} data
+ * @return {Number} Mask pattern reference number
+ */
+exports.getBestMask = function getBestMask (data, setupFormatFunc) {
+  const numPatterns = Object.keys(exports.Patterns).length
+  let bestPattern = 0
+  let lowerPenalty = Infinity
+
+  for (let p = 0; p < numPatterns; p++) {
+    setupFormatFunc(p)
+    exports.applyMask(p, data)
+
+    // Calculate penalty
+    const penalty =
+      exports.getPenaltyN1(data) +
+      exports.getPenaltyN2(data) +
+      exports.getPenaltyN3(data) +
+      exports.getPenaltyN4(data)
+
+    // Undo previously applied mask
+    exports.applyMask(p, data)
+
+    if (penalty < lowerPenalty) {
+      lowerPenalty = penalty
+      bestPattern = p
+    }
+  }
+
+  return bestPattern
+}

extracted-source/node_modules/qrcode/lib/core/mode.js

@@ -0,0 +1,167 @@
+const VersionCheck = require('./version-check')
+const Regex = require('./regex')
+
+/**
+ * Numeric mode encodes data from the decimal digit set (0 - 9)
+ * (byte values 30HEX to 39HEX).
+ * Normally, 3 data characters are represented by 10 bits.
+ *
+ * @type {Object}
+ */
+exports.NUMERIC = {
+  id: 'Numeric',
+  bit: 1 << 0,
+  ccBits: [10, 12, 14]
+}
+
+/**
+ * Alphanumeric mode encodes data from a set of 45 characters,
+ * i.e. 10 numeric digits (0 - 9),
+ *      26 alphabetic characters (A - Z),
+ *   and 9 symbols (SP, $, %, *, +, -, ., /, :).
+ * Normally, two input characters are represented by 11 bits.
+ *
+ * @type {Object}
+ */
+exports.ALPHANUMERIC = {
+  id: 'Alphanumeric',
+  bit: 1 << 1,
+  ccBits: [9, 11, 13]
+}
+
+/**
+ * In byte mode, data is encoded at 8 bits per character.
+ *
+ * @type {Object}
+ */
+exports.BYTE = {
+  id: 'Byte',
+  bit: 1 << 2,
+  ccBits: [8, 16, 16]
+}
+
+/**
+ * The Kanji mode efficiently encodes Kanji characters in accordance with
+ * the Shift JIS system based on JIS X 0208.
+ * The Shift JIS values are shifted from the JIS X 0208 values.
+ * JIS X 0208 gives details of the shift coded representation.
+ * Each two-byte character value is compacted to a 13-bit binary codeword.
+ *
+ * @type {Object}
+ */
+exports.KANJI = {
+  id: 'Kanji',
+  bit: 1 << 3,
+  ccBits: [8, 10, 12]
+}
+
+/**
+ * Mixed mode will contain a sequences of data in a combination of any of
+ * the modes described above
+ *
+ * @type {Object}
+ */
+exports.MIXED = {
+  bit: -1
+}
+
+/**
+ * Returns the number of bits needed to store the data length
+ * according to QR Code specifications.
+ *
+ * @param  {Mode}   mode    Data mode
+ * @param  {Number} version QR Code version
+ * @return {Number}         Number of bits
+ */
+exports.getCharCountIndicator = function getCharCountIndicator (mode, version) {
+  if (!mode.ccBits) throw new Error('Invalid mode: ' + mode)
+
+  if (!VersionCheck.isValid(version)) {
+    throw new Error('Invalid version: ' + version)
+  }
+
+  if (version >= 1 && version < 10) return mode.ccBits[0]
+  else if (version < 27) return mode.ccBits[1]
+  return mode.ccBits[2]
+}
+
+/**
+ * Returns the most efficient mode to store the specified data
+ *
+ * @param  {String} dataStr Input data string
+ * @return {Mode}           Best mode
+ */
+exports.getBestModeForData = function getBestModeForData (dataStr) {
+  if (Regex.testNumeric(dataStr)) return exports.NUMERIC
+  else if (Regex.testAlphanumeric(dataStr)) return exports.ALPHANUMERIC
+  else if (Regex.testKanji(dataStr)) return exports.KANJI
+  else return exports.BYTE
+}
+
+/**
+ * Return mode name as string
+ *
+ * @param {Mode} mode Mode object
+ * @returns {String}  Mode name
+ */
+exports.toString = function toString (mode) {
+  if (mode && mode.id) return mode.id
+  throw new Error('Invalid mode')
+}
+
+/**
+ * Check if input param is a valid mode object
+ *
+ * @param   {Mode}    mode Mode object
+ * @returns {Boolean} True if valid mode, false otherwise
+ */
+exports.isValid = function isValid (mode) {
+  return mode && mode.bit && mode.ccBits
+}
+
+/**
+ * Get mode object from its name
+ *
+ * @param   {String} string Mode name
+ * @returns {Mode}          Mode object
+ */
+function fromString (string) {
+  if (typeof string !== 'string') {
+    throw new Error('Param is not a string')
+  }
+
+  const lcStr = string.toLowerCase()
+
+  switch (lcStr) {
+    case 'numeric':
+      return exports.NUMERIC
+    case 'alphanumeric':
+      return exports.ALPHANUMERIC
+    case 'kanji':
+      return exports.KANJI
+    case 'byte':
+      return exports.BYTE
+    default:
+      throw new Error('Unknown mode: ' + string)
+  }
+}
+
+/**
+ * Returns mode from a value.
+ * If value is not a valid mode, returns defaultValue
+ *
+ * @param  {Mode|String} value        Encoding mode
+ * @param  {Mode}        defaultValue Fallback value
+ * @return {Mode}                     Encoding mode
+ */
+exports.from = function from (value, defaultValue) {
+  if (exports.isValid(value)) {
+    return value
+  }
+
+  try {
+    return fromString(value)
+  } catch (e) {
+    return defaultValue
+  }
+}

extracted-source/node_modules/qrcode/lib/core/numeric-data.js

@@ -0,0 +1,43 @@
+const Mode = require('./mode')
+
+function NumericData (data) {
+  this.mode = Mode.NUMERIC
+  this.data = data.toString()
+}
+
+NumericData.getBitsLength = function getBitsLength (length) {
+  return 10 * Math.floor(length / 3) + ((length % 3) ? ((length % 3) * 3 + 1) : 0)
+}
+
+NumericData.prototype.getLength = function getLength () {
+  return this.data.length
+}
+
+NumericData.prototype.getBitsLength = function getBitsLength () {
+  return NumericData.getBitsLength(this.data.length)
+}
+
+NumericData.prototype.write = function write (bitBuffer) {
+  let i, group, value
+
+  // The input data string is divided into groups of three digits,
+  // and each group is converted to its 10-bit binary equivalent.
+  for (i = 0; i + 3 <= this.data.length; i += 3) {
+    group = this.data.substr(i, 3)
+    value = parseInt(group, 10)
+
+    bitBuffer.put(value, 10)
+  }
+
+  // If the number of input digits is not an exact multiple of three,
+  // the final one or two digits are converted to 4 or 7 bits respectively.
+  const remainingNum = this.data.length - i
+  if (remainingNum > 0) {
+    group = this.data.substr(i)
+    value = parseInt(group, 10)
+
+    bitBuffer.put(value, remainingNum * 3 + 1)
+  }
+}
+
+module.exports = NumericData

extracted-source/node_modules/qrcode/lib/core/polynomial.js

@@ -0,0 +1,62 @@
+const GF = require('./galois-field')
+
+/**
+ * Multiplies two polynomials inside Galois Field
+ *
+ * @param  {Uint8Array} p1 Polynomial
+ * @param  {Uint8Array} p2 Polynomial
+ * @return {Uint8Array}    Product of p1 and p2
+ */
+exports.mul = function mul (p1, p2) {
+  const coeff = new Uint8Array(p1.length + p2.length - 1)
+
+  for (let i = 0; i < p1.length; i++) {
+    for (let j = 0; j < p2.length; j++) {
+      coeff[i + j] ^= GF.mul(p1[i], p2[j])
+    }
+  }
+
+  return coeff
+}
+
+/**
+ * Calculate the remainder of polynomials division
+ *
+ * @param  {Uint8Array} divident Polynomial
+ * @param  {Uint8Array} divisor  Polynomial
+ * @return {Uint8Array}          Remainder
+ */
+exports.mod = function mod (divident, divisor) {
+  let result = new Uint8Array(divident)
+
+  while ((result.length - divisor.length) >= 0) {
+    const coeff = result[0]
+
+    for (let i = 0; i < divisor.length; i++) {
+      result[i] ^= GF.mul(divisor[i], coeff)
+    }
+
+    // remove all zeros from buffer head
+    let offset = 0
+    while (offset < result.length && result[offset] === 0) offset++
+    result = result.slice(offset)
+  }
+
+  return result
+}
+
+/**
+ * Generate an irreducible generator polynomial of specified degree
+ * (used by Reed-Solomon encoder)
+ *
+ * @param  {Number} degree Degree of the generator polynomial
+ * @return {Uint8Array}    Buffer containing polynomial coefficients
+ */
+exports.generateECPolynomial = function generateECPolynomial (degree) {
+  let poly = new Uint8Array([1])
+  for (let i = 0; i < degree; i++) {
+    poly = exports.mul(poly, new Uint8Array([1, GF.exp(i)]))
+  }
+
+  return poly
+}

extracted-source/node_modules/qrcode/lib/core/qrcode.js

@@ -0,0 +1,495 @@
+const Utils = require('./utils')
+const ECLevel = require('./error-correction-level')
+const BitBuffer = require('./bit-buffer')
+const BitMatrix = require('./bit-matrix')
+const AlignmentPattern = require('./alignment-pattern')
+const FinderPattern = require('./finder-pattern')
+const MaskPattern = require('./mask-pattern')
+const ECCode = require('./error-correction-code')
+const ReedSolomonEncoder = require('./reed-solomon-encoder')
+const Version = require('./version')
+const FormatInfo = require('./format-info')
+const Mode = require('./mode')
+const Segments = require('./segments')
+
+/**
+ * QRCode for JavaScript
+ *
+ * modified by Ryan Day for nodejs support
+ * Copyright (c) 2011 Ryan Day
+ *
+ * Licensed under the MIT license:
+ *   http://www.opensource.org/licenses/mit-license.php
+ *
+//---------------------------------------------------------------------
+// QRCode for JavaScript
+//
+// Copyright (c) 2009 Kazuhiko Arase
+//
+// URL: http://www.d-project.com/
+//
+// Licensed under the MIT license:
+//   http://www.opensource.org/licenses/mit-license.php
+//
+// The word "QR Code" is registered trademark of
+// DENSO WAVE INCORPORATED
+//   http://www.denso-wave.com/qrcode/faqpatent-e.html
+//
+//---------------------------------------------------------------------
+*/
+
+/**
+ * Add finder patterns bits to matrix
+ *
+ * @param  {BitMatrix} matrix  Modules matrix
+ * @param  {Number}    version QR Code version
+ */
+function setupFinderPattern (matrix, version) {
+  const size = matrix.size
+  const pos = FinderPattern.getPositions(version)
+
+  for (let i = 0; i < pos.length; i++) {
+    const row = pos[i][0]
+    const col = pos[i][1]
+
+    for (let r = -1; r <= 7; r++) {
+      if (row + r <= -1 || size <= row + r) continue
+
+      for (let c = -1; c <= 7; c++) {
+        if (col + c <= -1 || size <= col + c) continue
+
+        if ((r >= 0 && r <= 6 && (c === 0 || c === 6)) ||
+          (c >= 0 && c <= 6 && (r === 0 || r === 6)) ||
+          (r >= 2 && r <= 4 && c >= 2 && c <= 4)) {
+          matrix.set(row + r, col + c, true, true)
+        } else {
+          matrix.set(row + r, col + c, false, true)
+        }
+      }
+    }
+  }
+}
+
+/**
+ * Add timing pattern bits to matrix
+ *
+ * Note: this function must be called before {@link setupAlignmentPattern}
+ *
+ * @param  {BitMatrix} matrix Modules matrix
+ */
+function setupTimingPattern (matrix) {
+  const size = matrix.size
+
+  for (let r = 8; r < size - 8; r++) {
+    const value = r % 2 === 0
+    matrix.set(r, 6, value, true)
+    matrix.set(6, r, value, true)
+  }
+}
+
+/**
+ * Add alignment patterns bits to matrix
+ *
+ * Note: this function must be called after {@link setupTimingPattern}
+ *
+ * @param  {BitMatrix} matrix  Modules matrix
+ * @param  {Number}    version QR Code version
+ */
+function setupAlignmentPattern (matrix, version) {
+  const pos = AlignmentPattern.getPositions(version)
+
+  for (let i = 0; i < pos.length; i++) {
+    const row = pos[i][0]
+    const col = pos[i][1]
+
+    for (let r = -2; r <= 2; r++) {
+      for (let c = -2; c <= 2; c++) {
+        if (r === -2 || r === 2 || c === -2 || c === 2 ||
+          (r === 0 && c === 0)) {
+          matrix.set(row + r, col + c, true, true)
+        } else {
+          matrix.set(row + r, col + c, false, true)
+        }
+      }
+    }
+  }
+}
+
+/**
+ * Add version info bits to matrix
+ *
+ * @param  {BitMatrix} matrix  Modules matrix
+ * @param  {Number}    version QR Code version
+ */
+function setupVersionInfo (matrix, version) {
+  const size = matrix.size
+  const bits = Version.getEncodedBits(version)
+  let row, col, mod
+
+  for (let i = 0; i < 18; i++) {
+    row = Math.floor(i / 3)
+    col = i % 3 + size - 8 - 3
+    mod = ((bits >> i) & 1) === 1
+
+    matrix.set(row, col, mod, true)
+    matrix.set(col, row, mod, true)
+  }
+}
+
+/**
+ * Add format info bits to matrix
+ *
+ * @param  {BitMatrix} matrix               Modules matrix
+ * @param  {ErrorCorrectionLevel}    errorCorrectionLevel Error correction level
+ * @param  {Number}    maskPattern          Mask pattern reference value
+ */
+function setupFormatInfo (matrix, errorCorrectionLevel, maskPattern) {
+  const size = matrix.size
+  const bits = FormatInfo.getEncodedBits(errorCorrectionLevel, maskPattern)
+  let i, mod
+
+  for (i = 0; i < 15; i++) {
+    mod = ((bits >> i) & 1) === 1
+
+    // vertical
+    if (i < 6) {
+      matrix.set(i, 8, mod, true)
+    } else if (i < 8) {
+      matrix.set(i + 1, 8, mod, true)
+    } else {
+      matrix.set(size - 15 + i, 8, mod, true)
+    }
+
+    // horizontal
+    if (i < 8) {
+      matrix.set(8, size - i - 1, mod, true)
+    } else if (i < 9) {
+      matrix.set(8, 15 - i - 1 + 1, mod, true)
+    } else {
+      matrix.set(8, 15 - i - 1, mod, true)
+    }
+  }
+
+  // fixed module
+  matrix.set(size - 8, 8, 1, true)
+}
+
+/**
+ * Add encoded data bits to matrix
+ *
+ * @param  {BitMatrix}  matrix Modules matrix
+ * @param  {Uint8Array} data   Data codewords
+ */
+function setupData (matrix, data) {
+  const size = matrix.size
+  let inc = -1
+  let row = size - 1
+  let bitIndex = 7
+  let byteIndex = 0
+
+  for (let col = size - 1; col > 0; col -= 2) {
+    if (col === 6) col--
+
+    while (true) {
+      for (let c = 0; c < 2; c++) {
+        if (!matrix.isReserved(row, col - c)) {
+          let dark = false
+
+          if (byteIndex < data.length) {
+            dark = (((data[byteIndex] >>> bitIndex) & 1) === 1)
+          }
+
+          matrix.set(row, col - c, dark)
+          bitIndex--
+
+          if (bitIndex === -1) {
+            byteIndex++
+            bitIndex = 7
+          }
+        }
+      }
+
+      row += inc
+
+      if (row < 0 || size <= row) {
+        row -= inc
+        inc = -inc
+        break
+      }
+    }
+  }
+}
+
+/**
+ * Create encoded codewords from data input
+ *
+ * @param  {Number}   version              QR Code version
+ * @param  {ErrorCorrectionLevel}   errorCorrectionLevel Error correction level
+ * @param  {ByteData} data                 Data input
+ * @return {Uint8Array}                    Buffer containing encoded codewords
+ */
+function createData (version, errorCorrectionLevel, segments) {
+  // Prepare data buffer
+  const buffer = new BitBuffer()
+
+  segments.forEach(function (data) {
+    // prefix data with mode indicator (4 bits)
+    buffer.put(data.mode.bit, 4)
+
+    // Prefix data with character count indicator.
+    // The character count indicator is a string of bits that represents the
+    // number of characters that are being encoded.
+    // The character count indicator must be placed after the mode indicator
+    // and must be a certain number of bits long, depending on the QR version
+    // and data mode
+    // @see {@link Mode.getCharCountIndicator}.
+    buffer.put(data.getLength(), Mode.getCharCountIndicator(data.mode, version))
+
+    // add binary data sequence to buffer
+    data.write(buffer)
+  })
+
+  // Calculate required number of bits
+  const totalCodewords = Utils.getSymbolTotalCodewords(version)
+  const ecTotalCodewords = ECCode.getTotalCodewordsCount(version, errorCorrectionLevel)
+  const dataTotalCodewordsBits = (totalCodewords - ecTotalCodewords) * 8
+
+  // Add a terminator.
+  // If the bit string is shorter than the total number of required bits,
+  // a terminator of up to four 0s must be added to the right side of the string.
+  // If the bit string is more than four bits shorter than the required number of bits,
+  // add four 0s to the end.
+  if (buffer.getLengthInBits() + 4 <= dataTotalCodewordsBits) {
+    buffer.put(0, 4)
+  }
+
+  // If the bit string is fewer than four bits shorter, add only the number of 0s that
+  // are needed to reach the required number of bits.
+
+  // After adding the terminator, if the number of bits in the string is not a multiple of 8,
+  // pad the string on the right with 0s to make the string's length a multiple of 8.
+  while (buffer.getLengthInBits() % 8 !== 0) {
+    buffer.putBit(0)
+  }
+
+  // Add pad bytes if the string is still shorter than the total number of required bits.
+  // Extend the buffer to fill the data capacity of the symbol corresponding to
+  // the Version and Error Correction Level by adding the Pad Codewords 11101100 (0xEC)
+  // and 00010001 (0x11) alternately.
+  const remainingByte = (dataTotalCodewordsBits - buffer.getLengthInBits()) / 8
+  for (let i = 0; i < remainingByte; i++) {
+    buffer.put(i % 2 ? 0x11 : 0xEC, 8)
+  }
+
+  return createCodewords(buffer, version, errorCorrectionLevel)
+}
+
+/**
+ * Encode input data with Reed-Solomon and return codewords with
+ * relative error correction bits
+ *
+ * @param  {BitBuffer} bitBuffer            Data to encode
+ * @param  {Number}    version              QR Code version
+ * @param  {ErrorCorrectionLevel} errorCorrectionLevel Error correction level
+ * @return {Uint8Array}                     Buffer containing encoded codewords
+ */
+function createCodewords (bitBuffer, version, errorCorrectionLevel) {
+  // Total codewords for this QR code version (Data + Error correction)
+  const totalCodewords = Utils.getSymbolTotalCodewords(version)
+
+  // Total number of error correction codewords
+  const ecTotalCodewords = ECCode.getTotalCodewordsCount(version, errorCorrectionLevel)
+
+  // Total number of data codewords
+  const dataTotalCodewords = totalCodewords - ecTotalCodewords
+
+  // Total number of blocks
+  const ecTotalBlocks = ECCode.getBlocksCount(version, errorCorrectionLevel)
+
+  // Calculate how many blocks each group should contain
+  const blocksInGroup2 = totalCodewords % ecTotalBlocks
+  const blocksInGroup1 = ecTotalBlocks - blocksInGroup2
+
+  const totalCodewordsInGroup1 = Math.floor(totalCodewords / ecTotalBlocks)
+
+  const dataCodewordsInGroup1 = Math.floor(dataTotalCodewords / ecTotalBlocks)
+  const dataCodewordsInGroup2 = dataCodewordsInGroup1 + 1
+
+  // Number of EC codewords is the same for both groups
+  const ecCount = totalCodewordsInGroup1 - dataCodewordsInGroup1
+
+  // Initialize a Reed-Solomon encoder with a generator polynomial of degree ecCount
+  const rs = new ReedSolomonEncoder(ecCount)
+
+  let offset = 0
+  const dcData = new Array(ecTotalBlocks)
+  const ecData = new Array(ecTotalBlocks)
+  let maxDataSize = 0
+  const buffer = new Uint8Array(bitBuffer.buffer)
+
+  // Divide the buffer into the required number of blocks
+  for (let b = 0; b < ecTotalBlocks; b++) {
+    const dataSize = b < blocksInGroup1 ? dataCodewordsInGroup1 : dataCodewordsInGroup2
+
+    // extract a block of data from buffer
+    dcData[b] = buffer.slice(offset, offset + dataSize)
+
+    // Calculate EC codewords for this data block
+    ecData[b] = rs.encode(dcData[b])
+
+    offset += dataSize
+    maxDataSize = Math.max(maxDataSize, dataSize)
+  }
+
+  // Create final data
+  // Interleave the data and error correction codewords from each block
+  const data = new Uint8Array(totalCodewords)
+  let index = 0
+  let i, r
+
+  // Add data codewords
+  for (i = 0; i < maxDataSize; i++) {
+    for (r = 0; r < ecTotalBlocks; r++) {
+      if (i < dcData[r].length) {
+        data[index++] = dcData[r][i]
+      }
+    }
+  }
+
+  // Apped EC codewords
+  for (i = 0; i < ecCount; i++) {
+    for (r = 0; r < ecTotalBlocks; r++) {
+      data[index++] = ecData[r][i]
+    }
+  }
+
+  return data
+}
+
+/**
+ * Build QR Code symbol
+ *
+ * @param  {String} data                 Input string
+ * @param  {Number} version              QR Code version
+ * @param  {ErrorCorretionLevel} errorCorrectionLevel Error level
+ * @param  {MaskPattern} maskPattern     Mask pattern
+ * @return {Object}                      Object containing symbol data
+ */
+function createSymbol (data, version, errorCorrectionLevel, maskPattern) {
+  let segments
+
+  if (Array.isArray(data)) {
+    segments = Segments.fromArray(data)
+  } else if (typeof data === 'string') {
+    let estimatedVersion = version
+
+    if (!estimatedVersion) {
+      const rawSegments = Segments.rawSplit(data)
+
+      // Estimate best version that can contain raw splitted segments
+      estimatedVersion = Version.getBestVersionForData(rawSegments, errorCorrectionLevel)
+    }
+
+    // Build optimized segments
+    // If estimated version is undefined, try with the highest version
+    segments = Segments.fromString(data, estimatedVersion || 40)
+  } else {
+    throw new Error('Invalid data')
+  }
+
+  // Get the min version that can contain data
+  const bestVersion = Version.getBestVersionForData(segments, errorCorrectionLevel)
+
+  // If no version is found, data cannot be stored
+  if (!bestVersion) {
+    throw new Error('The amount of data is too big to be stored in a QR Code')
+  }
+
+  // If not specified, use min version as default
+  if (!version) {
+    version = bestVersion
+
+  // Check if the specified version can contain the data
+  } else if (version < bestVersion) {
+    throw new Error('\n' +
+      'The chosen QR Code version cannot contain this amount of data.\n' +
+      'Minimum version required to store current data is: ' + bestVersion + '.\n'
+    )
+  }
+
+  const dataBits = createData(version, errorCorrectionLevel, segments)
+
+  // Allocate matrix buffer
+  const moduleCount = Utils.getSymbolSize(version)
+  const modules = new BitMatrix(moduleCount)
+
+  // Add function modules
+  setupFinderPattern(modules, version)
+  setupTimingPattern(modules)
+  setupAlignmentPattern(modules, version)
+
+  // Add temporary dummy bits for format info just to set them as reserved.
+  // This is needed to prevent these bits from being masked by {@link MaskPattern.applyMask}
+  // since the masking operation must be performed only on the encoding region.
+  // These blocks will be replaced with correct values later in code.
+  setupFormatInfo(modules, errorCorrectionLevel, 0)
+
+  if (version >= 7) {
+    setupVersionInfo(modules, version)
+  }
+
+  // Add data codewords
+  setupData(modules, dataBits)
+
+  if (isNaN(maskPattern)) {
+    // Find best mask pattern
+    maskPattern = MaskPattern.getBestMask(modules,
+      setupFormatInfo.bind(null, modules, errorCorrectionLevel))
+  }
+
+  // Apply mask pattern
+  MaskPattern.applyMask(maskPattern, modules)
+
+  // Replace format info bits with correct values
+  setupFormatInfo(modules, errorCorrectionLevel, maskPattern)
+
+  return {
+    modules: modules,
+    version: version,
+    errorCorrectionLevel: errorCorrectionLevel,
+    maskPattern: maskPattern,
+    segments: segments
+  }
+}
+
+/**
+ * QR Code
+ *
+ * @param {String | Array} data                 Input data
+ * @param {Object} options                      Optional configurations
+ * @param {Number} options.version              QR Code version
+ * @param {String} options.errorCorrectionLevel Error correction level
+ * @param {Function} options.toSJISFunc         Helper func to convert utf8 to sjis
+ */
+exports.create = function create (data, options) {
+  if (typeof data === 'undefined' || data === '') {
+    throw new Error('No input text')
+  }
+
+  let errorCorrectionLevel = ECLevel.M
+  let version
+  let mask
+
+  if (typeof options !== 'undefined') {
+    // Use higher error correction level as default
+    errorCorrectionLevel = ECLevel.from(options.errorCorrectionLevel, ECLevel.M)
+    version = Version.from(options.version)
+    mask = MaskPattern.from(options.maskPattern)
+
+    if (options.toSJISFunc) {
+      Utils.setToSJISFunction(options.toSJISFunc)
+    }
+  }
+
+  return createSymbol(data, version, errorCorrectionLevel, mask)
+}

extracted-source/node_modules/qrcode/lib/core/reed-solomon-encoder.js

@@ -0,0 +1,56 @@
+const Polynomial = require('./polynomial')
+
+function ReedSolomonEncoder (degree) {
+  this.genPoly = undefined
+  this.degree = degree
+
+  if (this.degree) this.initialize(this.degree)
+}
+
+/**
+ * Initialize the encoder.
+ * The input param should correspond to the number of error correction codewords.
+ *
+ * @param  {Number} degree
+ */
+ReedSolomonEncoder.prototype.initialize = function initialize (degree) {
+  // create an irreducible generator polynomial
+  this.degree = degree
+  this.genPoly = Polynomial.generateECPolynomial(this.degree)
+}
+
+/**
+ * Encodes a chunk of data
+ *
+ * @param  {Uint8Array} data Buffer containing input data
+ * @return {Uint8Array}      Buffer containing encoded data
+ */
+ReedSolomonEncoder.prototype.encode = function encode (data) {
+  if (!this.genPoly) {
+    throw new Error('Encoder not initialized')
+  }
+
+  // Calculate EC for this data block
+  // extends data size to data+genPoly size
+  const paddedData = new Uint8Array(data.length + this.degree)
+  paddedData.set(data)
+
+  // The error correction codewords are the remainder after dividing the data codewords
+  // by a generator polynomial
+  const remainder = Polynomial.mod(paddedData, this.genPoly)
+
+  // return EC data blocks (last n byte, where n is the degree of genPoly)
+  // If coefficients number in remainder are less than genPoly degree,
+  // pad with 0s to the left to reach the needed number of coefficients
+  const start = this.degree - remainder.length
+  if (start > 0) {
+    const buff = new Uint8Array(this.degree)
+    buff.set(remainder, start)
+
+    return buff
+  }
+
+  return remainder
+}
+
+module.exports = ReedSolomonEncoder

extracted-source/node_modules/qrcode/lib/core/regex.js

@@ -0,0 +1,31 @@
+const numeric = '[0-9]+'
+const alphanumeric = '[A-Z $%*+\\-./:]+'
+let kanji = '(?:[u3000-u303F]|[u3040-u309F]|[u30A0-u30FF]|' +
+  '[uFF00-uFFEF]|[u4E00-u9FAF]|[u2605-u2606]|[u2190-u2195]|u203B|' +
+  '[u2010u2015u2018u2019u2025u2026u201Cu201Du2225u2260]|' +
+  '[u0391-u0451]|[u00A7u00A8u00B1u00B4u00D7u00F7])+'
+kanji = kanji.replace(/u/g, '\\u')
+
+const byte = '(?:(?![A-Z0-9 $%*+\\-./:]|' + kanji + ')(?:.|[\r\n]))+'
+
+exports.KANJI = new RegExp(kanji, 'g')
+exports.BYTE_KANJI = new RegExp('[^A-Z0-9 $%*+\\-./:]+', 'g')
+exports.BYTE = new RegExp(byte, 'g')
+exports.NUMERIC = new RegExp(numeric, 'g')
+exports.ALPHANUMERIC = new RegExp(alphanumeric, 'g')
+
+const TEST_KANJI = new RegExp('^' + kanji + '$')
+const TEST_NUMERIC = new RegExp('^' + numeric + '$')
+const TEST_ALPHANUMERIC = new RegExp('^[A-Z0-9 $%*+\\-./:]+$')
+
+exports.testKanji = function testKanji (str) {
+  return TEST_KANJI.test(str)
+}
+
+exports.testNumeric = function testNumeric (str) {
+  return TEST_NUMERIC.test(str)
+}
+
+exports.testAlphanumeric = function testAlphanumeric (str) {
+  return TEST_ALPHANUMERIC.test(str)
+}

extracted-source/node_modules/qrcode/lib/core/segments.js

@@ -0,0 +1,330 @@
+const Mode = require('./mode')
+const NumericData = require('./numeric-data')
+const AlphanumericData = require('./alphanumeric-data')
+const ByteData = require('./byte-data')
+const KanjiData = require('./kanji-data')
+const Regex = require('./regex')
+const Utils = require('./utils')
+const dijkstra = require('dijkstrajs')
+
+/**
+ * Returns UTF8 byte length
+ *
+ * @param  {String} str Input string
+ * @return {Number}     Number of byte
+ */
+function getStringByteLength (str) {
+  return unescape(encodeURIComponent(str)).length
+}
+
+/**
+ * Get a list of segments of the specified mode
+ * from a string
+ *
+ * @param  {Mode}   mode Segment mode
+ * @param  {String} str  String to process
+ * @return {Array}       Array of object with segments data
+ */
+function getSegments (regex, mode, str) {
+  const segments = []
+  let result
+
+  while ((result = regex.exec(str)) !== null) {
+    segments.push({
+      data: result[0],
+      index: result.index,
+      mode: mode,
+      length: result[0].length
+    })
+  }
+
+  return segments
+}
+
+/**
+ * Extracts a series of segments with the appropriate
+ * modes from a string
+ *
+ * @param  {String} dataStr Input string
+ * @return {Array}          Array of object with segments data
+ */
+function getSegmentsFromString (dataStr) {
+  const numSegs = getSegments(Regex.NUMERIC, Mode.NUMERIC, dataStr)
+  const alphaNumSegs = getSegments(Regex.ALPHANUMERIC, Mode.ALPHANUMERIC, dataStr)
+  let byteSegs
+  let kanjiSegs
+
+  if (Utils.isKanjiModeEnabled()) {
+    byteSegs = getSegments(Regex.BYTE, Mode.BYTE, dataStr)
+    kanjiSegs = getSegments(Regex.KANJI, Mode.KANJI, dataStr)
+  } else {
+    byteSegs = getSegments(Regex.BYTE_KANJI, Mode.BYTE, dataStr)
+    kanjiSegs = []
+  }
+
+  const segs = numSegs.concat(alphaNumSegs, byteSegs, kanjiSegs)
+
+  return segs
+    .sort(function (s1, s2) {
+      return s1.index - s2.index
+    })
+    .map(function (obj) {
+      return {
+        data: obj.data,
+        mode: obj.mode,
+        length: obj.length
+      }
+    })
+}
+
+/**
+ * Returns how many bits are needed to encode a string of
+ * specified length with the specified mode
+ *
+ * @param  {Number} length String length
+ * @param  {Mode} mode     Segment mode
+ * @return {Number}        Bit length
+ */
+function getSegmentBitsLength (length, mode) {
+  switch (mode) {
+    case Mode.NUMERIC:
+      return NumericData.getBitsLength(length)
+    case Mode.ALPHANUMERIC:
+      return AlphanumericData.getBitsLength(length)
+    case Mode.KANJI:
+      return KanjiData.getBitsLength(length)
+    case Mode.BYTE:
+      return ByteData.getBitsLength(length)
+  }
+}
+
+/**
+ * Merges adjacent segments which have the same mode
+ *
+ * @param  {Array} segs Array of object with segments data
+ * @return {Array}      Array of object with segments data
+ */
+function mergeSegments (segs) {
+  return segs.reduce(function (acc, curr) {
+    const prevSeg = acc.length - 1 >= 0 ? acc[acc.length - 1] : null
+    if (prevSeg && prevSeg.mode === curr.mode) {
+      acc[acc.length - 1].data += curr.data
+      return acc
+    }
+
+    acc.push(curr)
+    return acc
+  }, [])
+}
+
+/**
+ * Generates a list of all possible nodes combination which
+ * will be used to build a segments graph.
+ *
+ * Nodes are divided by groups. Each group will contain a list of all the modes
+ * in which is possible to encode the given text.
+ *
+ * For example the text '12345' can be encoded as Numeric, Alphanumeric or Byte.
+ * The group for '12345' will contain then 3 objects, one for each
+ * possible encoding mode.
+ *
+ * Each node represents a possible segment.
+ *
+ * @param  {Array} segs Array of object with segments data
+ * @return {Array}      Array of object with segments data
+ */
+function buildNodes (segs) {
+  const nodes = []
+  for (let i = 0; i < segs.length; i++) {
+    const seg = segs[i]
+
+    switch (seg.mode) {
+      case Mode.NUMERIC:
+        nodes.push([seg,
+          { data: seg.data, mode: Mode.ALPHANUMERIC, length: seg.length },
+          { data: seg.data, mode: Mode.BYTE, length: seg.length }
+        ])
+        break
+      case Mode.ALPHANUMERIC:
+        nodes.push([seg,
+          { data: seg.data, mode: Mode.BYTE, length: seg.length }
+        ])
+        break
+      case Mode.KANJI:
+        nodes.push([seg,
+          { data: seg.data, mode: Mode.BYTE, length: getStringByteLength(seg.data) }
+        ])
+        break
+      case Mode.BYTE:
+        nodes.push([
+          { data: seg.data, mode: Mode.BYTE, length: getStringByteLength(seg.data) }
+        ])
+    }
+  }
+
+  return nodes
+}
+
+/**
+ * Builds a graph from a list of nodes.
+ * All segments in each node group will be connected with all the segments of
+ * the next group and so on.
+ *
+ * At each connection will be assigned a weight depending on the
+ * segment's byte length.
+ *
+ * @param  {Array} nodes    Array of object with segments data
+ * @param  {Number} version QR Code version
+ * @return {Object}         Graph of all possible segments
+ */
+function buildGraph (nodes, version) {
+  const table = {}
+  const graph = { start: {} }
+  let prevNodeIds = ['start']
+
+  for (let i = 0; i < nodes.length; i++) {
+    const nodeGroup = nodes[i]
+    const currentNodeIds = []
+
+    for (let j = 0; j < nodeGroup.length; j++) {
+      const node = nodeGroup[j]
+      const key = '' + i + j
+
+      currentNodeIds.push(key)
+      table[key] = { node: node, lastCount: 0 }
+      graph[key] = {}
+
+      for (let n = 0; n < prevNodeIds.length; n++) {
+        const prevNodeId = prevNodeIds[n]
+
+        if (table[prevNodeId] && table[prevNodeId].node.mode === node.mode) {
+          graph[prevNodeId][key] =
+            getSegmentBitsLength(table[prevNodeId].lastCount + node.length, node.mode) -
+            getSegmentBitsLength(table[prevNodeId].lastCount, node.mode)
+
+          table[prevNodeId].lastCount += node.length
+        } else {
+          if (table[prevNodeId]) table[prevNodeId].lastCount = node.length
+
+          graph[prevNodeId][key] = getSegmentBitsLength(node.length, node.mode) +
+            4 + Mode.getCharCountIndicator(node.mode, version) // switch cost
+        }
+      }
+    }
+
+    prevNodeIds = currentNodeIds
+  }
+
+  for (let n = 0; n < prevNodeIds.length; n++) {
+    graph[prevNodeIds[n]].end = 0
+  }
+
+  return { map: graph, table: table }
+}
+
+/**
+ * Builds a segment from a specified data and mode.
+ * If a mode is not specified, the more suitable will be used.
+ *
+ * @param  {String} data             Input data
+ * @param  {Mode | String} modesHint Data mode
+ * @return {Segment}                 Segment
+ */
+function buildSingleSegment (data, modesHint) {
+  let mode
+  const bestMode = Mode.getBestModeForData(data)
+
+  mode = Mode.from(modesHint, bestMode)
+
+  // Make sure data can be encoded
+  if (mode !== Mode.BYTE && mode.bit < bestMode.bit) {
+    throw new Error('"' + data + '"' +
+      ' cannot be encoded with mode ' + Mode.toString(mode) +
+      '.\n Suggested mode is: ' + Mode.toString(bestMode))
+  }
+
+  // Use Mode.BYTE if Kanji support is disabled
+  if (mode === Mode.KANJI && !Utils.isKanjiModeEnabled()) {
+    mode = Mode.BYTE
+  }
+
+  switch (mode) {
+    case Mode.NUMERIC:
+      return new NumericData(data)
+
+    case Mode.ALPHANUMERIC:
+      return new AlphanumericData(data)
+
+    case Mode.KANJI:
+      return new KanjiData(data)
+
+    case Mode.BYTE:
+      return new ByteData(data)
+  }
+}
+
+/**
+ * Builds a list of segments from an array.
+ * Array can contain Strings or Objects with segment's info.
+ *
+ * For each item which is a string, will be generated a segment with the given
+ * string and the more appropriate encoding mode.
+ *
+ * For each item which is an object, will be generated a segment with the given
+ * data and mode.
+ * Objects must contain at least the property "data".
+ * If property "mode" is not present, the more suitable mode will be used.
+ *
+ * @param  {Array} array Array of objects with segments data
+ * @return {Array}       Array of Segments
+ */
+exports.fromArray = function fromArray (array) {
+  return array.reduce(function (acc, seg) {
+    if (typeof seg === 'string') {
+      acc.push(buildSingleSegment(seg, null))
+    } else if (seg.data) {
+      acc.push(buildSingleSegment(seg.data, seg.mode))
+    }
+
+    return acc
+  }, [])
+}
+
+/**
+ * Builds an optimized sequence of segments from a string,
+ * which will produce the shortest possible bitstream.
+ *
+ * @param  {String} data    Input string
+ * @param  {Number} version QR Code version
+ * @return {Array}          Array of segments
+ */
+exports.fromString = function fromString (data, version) {
+  const segs = getSegmentsFromString(data, Utils.isKanjiModeEnabled())
+
+  const nodes = buildNodes(segs)
+  const graph = buildGraph(nodes, version)
+  const path = dijkstra.find_path(graph.map, 'start', 'end')
+
+  const optimizedSegs = []
+  for (let i = 1; i < path.length - 1; i++) {
+    optimizedSegs.push(graph.table[path[i]].node)
+  }
+
+  return exports.fromArray(mergeSegments(optimizedSegs))
+}
+
+/**
+ * Splits a string in various segments with the modes which
+ * best represent their content.
+ * The produced segments are far from being optimized.
+ * The output of this function is only used to estimate a QR Code version
+ * which may contain the data.
+ *
+ * @param  {string} data Input string
+ * @return {Array}       Array of segments
+ */
+exports.rawSplit = function rawSplit (data) {
+  return exports.fromArray(
+    getSegmentsFromString(data, Utils.isKanjiModeEnabled())
+  )
+}

extracted-source/node_modules/qrcode/lib/core/utils.js

@@ -0,0 +1,63 @@
+let toSJISFunction
+const CODEWORDS_COUNT = [
+  0, // Not used
+  26, 44, 70, 100, 134, 172, 196, 242, 292, 346,
+  404, 466, 532, 581, 655, 733, 815, 901, 991, 1085,
+  1156, 1258, 1364, 1474, 1588, 1706, 1828, 1921, 2051, 2185,
+  2323, 2465, 2611, 2761, 2876, 3034, 3196, 3362, 3532, 3706
+]
+
+/**
+ * Returns the QR Code size for the specified version
+ *
+ * @param  {Number} version QR Code version
+ * @return {Number}         size of QR code
+ */
+exports.getSymbolSize = function getSymbolSize (version) {
+  if (!version) throw new Error('"version" cannot be null or undefined')
+  if (version < 1 || version > 40) throw new Error('"version" should be in range from 1 to 40')
+  return version * 4 + 17
+}
+
+/**
+ * Returns the total number of codewords used to store data and EC information.
+ *
+ * @param  {Number} version QR Code version
+ * @return {Number}         Data length in bits
+ */
+exports.getSymbolTotalCodewords = function getSymbolTotalCodewords (version) {
+  return CODEWORDS_COUNT[version]
+}
+
+/**
+ * Encode data with Bose-Chaudhuri-Hocquenghem
+ *
+ * @param  {Number} data Value to encode
+ * @return {Number}      Encoded value
+ */
+exports.getBCHDigit = function (data) {
+  let digit = 0
+
+  while (data !== 0) {
+    digit++
+    data >>>= 1
+  }
+
+  return digit
+}
+
+exports.setToSJISFunction = function setToSJISFunction (f) {
+  if (typeof f !== 'function') {
+    throw new Error('"toSJISFunc" is not a valid function.')
+  }
+
+  toSJISFunction = f
+}
+
+exports.isKanjiModeEnabled = function () {
+  return typeof toSJISFunction !== 'undefined'
+}
+
+exports.toSJIS = function toSJIS (kanji) {
+  return toSJISFunction(kanji)
+}

extracted-source/node_modules/qrcode/lib/core/version-check.js

@@ -0,0 +1,9 @@
+/**
+ * Check if QR Code version is valid
+ *
+ * @param  {Number}  version QR Code version
+ * @return {Boolean}         true if valid version, false otherwise
+ */
+exports.isValid = function isValid (version) {
+  return !isNaN(version) && version >= 1 && version <= 40
+}

extracted-source/node_modules/qrcode/lib/core/version.js

@@ -0,0 +1,163 @@
+const Utils = require('./utils')
+const ECCode = require('./error-correction-code')
+const ECLevel = require('./error-correction-level')
+const Mode = require('./mode')
+const VersionCheck = require('./version-check')
+
+// Generator polynomial used to encode version information
+const G18 = (1 << 12) | (1 << 11) | (1 << 10) | (1 << 9) | (1 << 8) | (1 << 5) | (1 << 2) | (1 << 0)
+const G18_BCH = Utils.getBCHDigit(G18)
+
+function getBestVersionForDataLength (mode, length, errorCorrectionLevel) {
+  for (let currentVersion = 1; currentVersion <= 40; currentVersion++) {
+    if (length <= exports.getCapacity(currentVersion, errorCorrectionLevel, mode)) {
+      return currentVersion
+    }
+  }
+
+  return undefined
+}
+
+function getReservedBitsCount (mode, version) {
+  // Character count indicator + mode indicator bits
+  return Mode.getCharCountIndicator(mode, version) + 4
+}
+
+function getTotalBitsFromDataArray (segments, version) {
+  let totalBits = 0
+
+  segments.forEach(function (data) {
+    const reservedBits = getReservedBitsCount(data.mode, version)
+    totalBits += reservedBits + data.getBitsLength()
+  })
+
+  return totalBits
+}
+
+function getBestVersionForMixedData (segments, errorCorrectionLevel) {
+  for (let currentVersion = 1; currentVersion <= 40; currentVersion++) {
+    const length = getTotalBitsFromDataArray(segments, currentVersion)
+    if (length <= exports.getCapacity(currentVersion, errorCorrectionLevel, Mode.MIXED)) {
+      return currentVersion
+    }
+  }
+
+  return undefined
+}
+
+/**
+ * Returns version number from a value.
+ * If value is not a valid version, returns defaultValue
+ *
+ * @param  {Number|String} value        QR Code version
+ * @param  {Number}        defaultValue Fallback value
+ * @return {Number}                     QR Code version number
+ */
+exports.from = function from (value, defaultValue) {
+  if (VersionCheck.isValid(value)) {
+    return parseInt(value, 10)
+  }
+
+  return defaultValue
+}
+
+/**
+ * Returns how much data can be stored with the specified QR code version
+ * and error correction level
+ *
+ * @param  {Number} version              QR Code version (1-40)
+ * @param  {Number} errorCorrectionLevel Error correction level
+ * @param  {Mode}   mode                 Data mode
+ * @return {Number}                      Quantity of storable data
+ */
+exports.getCapacity = function getCapacity (version, errorCorrectionLevel, mode) {
+  if (!VersionCheck.isValid(version)) {
+    throw new Error('Invalid QR Code version')
+  }
+
+  // Use Byte mode as default
+  if (typeof mode === 'undefined') mode = Mode.BYTE
+
+  // Total codewords for this QR code version (Data + Error correction)
+  const totalCodewords = Utils.getSymbolTotalCodewords(version)
+
+  // Total number of error correction codewords
+  const ecTotalCodewords = ECCode.getTotalCodewordsCount(version, errorCorrectionLevel)
+
+  // Total number of data codewords
+  const dataTotalCodewordsBits = (totalCodewords - ecTotalCodewords) * 8
+
+  if (mode === Mode.MIXED) return dataTotalCodewordsBits
+
+  const usableBits = dataTotalCodewordsBits - getReservedBitsCount(mode, version)
+
+  // Return max number of storable codewords
+  switch (mode) {
+    case Mode.NUMERIC:
+      return Math.floor((usableBits / 10) * 3)
+
+    case Mode.ALPHANUMERIC:
+      return Math.floor((usableBits / 11) * 2)
+
+    case Mode.KANJI:
+      return Math.floor(usableBits / 13)
+
+    case Mode.BYTE:
+    default:
+      return Math.floor(usableBits / 8)
+  }
+}
+
+/**
+ * Returns the minimum version needed to contain the amount of data
+ *
+ * @param  {Segment} data                    Segment of data
+ * @param  {Number} [errorCorrectionLevel=H] Error correction level
+ * @param  {Mode} mode                       Data mode
+ * @return {Number}                          QR Code version
+ */
+exports.getBestVersionForData = function getBestVersionForData (data, errorCorrectionLevel) {
+  let seg
+
+  const ecl = ECLevel.from(errorCorrectionLevel, ECLevel.M)
+
+  if (Array.isArray(data)) {
+    if (data.length > 1) {
+      return getBestVersionForMixedData(data, ecl)
+    }
+
+    if (data.length === 0) {
+      return 1
+    }
+
+    seg = data[0]
+  } else {
+    seg = data
+  }
+
+  return getBestVersionForDataLength(seg.mode, seg.getLength(), ecl)
+}
+
+/**
+ * Returns version information with relative error correction bits
+ *
+ * The version information is included in QR Code symbols of version 7 or larger.
+ * It consists of an 18-bit sequence containing 6 data bits,
+ * with 12 error correction bits calculated using the (18, 6) Golay code.
+ *
+ * @param  {Number} version QR Code version
+ * @return {Number}         Encoded version info bits
+ */
+exports.getEncodedBits = function getEncodedBits (version) {
+  if (!VersionCheck.isValid(version) || version < 7) {
+    throw new Error('Invalid QR Code version')
+  }
+
+  let d = version << 12
+
+  while (Utils.getBCHDigit(d) - G18_BCH >= 0) {
+    d ^= (G18 << (Utils.getBCHDigit(d) - G18_BCH))
+  }
+
+  return (version << 12) | d
+}

extracted-source/node_modules/qrcode/lib/renderer/canvas.js

@@ -0,0 +1,63 @@
+const Utils = require('./utils')
+
+function clearCanvas (ctx, canvas, size) {
+  ctx.clearRect(0, 0, canvas.width, canvas.height)
+
+  if (!canvas.style) canvas.style = {}
+  canvas.height = size
+  canvas.width = size
+  canvas.style.height = size + 'px'
+  canvas.style.width = size + 'px'
+}
+
+function getCanvasElement () {
+  try {
+    return document.createElement('canvas')
+  } catch (e) {
+    throw new Error('You need to specify a canvas element')
+  }
+}
+
+exports.render = function render (qrData, canvas, options) {
+  let opts = options
+  let canvasEl = canvas
+
+  if (typeof opts === 'undefined' && (!canvas || !canvas.getContext)) {
+    opts = canvas
+    canvas = undefined
+  }
+
+  if (!canvas) {
+    canvasEl = getCanvasElement()
+  }
+
+  opts = Utils.getOptions(opts)
+  const size = Utils.getImageWidth(qrData.modules.size, opts)
+
+  const ctx = canvasEl.getContext('2d')
+  const image = ctx.createImageData(size, size)
+  Utils.qrToImageData(image.data, qrData, opts)
+
+  clearCanvas(ctx, canvasEl, size)
+  ctx.putImageData(image, 0, 0)
+
+  return canvasEl
+}
+
+exports.renderToDataURL = function renderToDataURL (qrData, canvas, options) {
+  let opts = options
+
+  if (typeof opts === 'undefined' && (!canvas || !canvas.getContext)) {
+    opts = canvas
+    canvas = undefined
+  }
+
+  if (!opts) opts = {}
+
+  const canvasEl = exports.render(qrData, canvas, opts)
+
+  const type = opts.type || 'image/png'
+  const rendererOpts = opts.rendererOpts || {}
+
+  return canvasEl.toDataURL(type, rendererOpts.quality)
+}

extracted-source/node_modules/qrcode/lib/renderer/png.js

@@ -0,0 +1,78 @@
+const fs = require('fs')
+const PNG = require('pngjs').PNG
+const Utils = require('./utils')
+
+exports.render = function render (qrData, options) {
+  const opts = Utils.getOptions(options)
+  const pngOpts = opts.rendererOpts
+  const size = Utils.getImageWidth(qrData.modules.size, opts)
+
+  pngOpts.width = size
+  pngOpts.height = size
+
+  const pngImage = new PNG(pngOpts)
+  Utils.qrToImageData(pngImage.data, qrData, opts)
+
+  return pngImage
+}
+
+exports.renderToDataURL = function renderToDataURL (qrData, options, cb) {
+  if (typeof cb === 'undefined') {
+    cb = options
+    options = undefined
+  }
+
+  exports.renderToBuffer(qrData, options, function (err, output) {
+    if (err) cb(err)
+    let url = 'data:image/png;base64,'
+    url += output.toString('base64')
+    cb(null, url)
+  })
+}
+
+exports.renderToBuffer = function renderToBuffer (qrData, options, cb) {
+  if (typeof cb === 'undefined') {
+    cb = options
+    options = undefined
+  }
+
+  const png = exports.render(qrData, options)
+  const buffer = []
+
+  png.on('error', cb)
+
+  png.on('data', function (data) {
+    buffer.push(data)
+  })
+
+  png.on('end', function () {
+    cb(null, Buffer.concat(buffer))
+  })
+
+  png.pack()
+}
+
+exports.renderToFile = function renderToFile (path, qrData, options, cb) {
+  if (typeof cb === 'undefined') {
+    cb = options
+    options = undefined
+  }
+
+  let called = false
+  const done = (...args) => {
+    if (called) return
+    called = true
+    cb.apply(null, args)
+  }
+  const stream = fs.createWriteStream(path)
+
+  stream.on('error', done)
+  stream.on('close', done)
+
+  exports.renderToFileStream(stream, qrData, options)
+}
+
+exports.renderToFileStream = function renderToFileStream (stream, qrData, options) {
+  const png = exports.render(qrData, options)
+  png.pack().pipe(stream)
+}

extracted-source/node_modules/qrcode/lib/renderer/svg-tag.js

@@ -0,0 +1,81 @@
+const Utils = require('./utils')
+
+function getColorAttrib (color, attrib) {
+  const alpha = color.a / 255
+  const str = attrib + '="' + color.hex + '"'
+
+  return alpha < 1
+    ? str + ' ' + attrib + '-opacity="' + alpha.toFixed(2).slice(1) + '"'
+    : str
+}
+
+function svgCmd (cmd, x, y) {
+  let str = cmd + x
+  if (typeof y !== 'undefined') str += ' ' + y
+
+  return str
+}
+
+function qrToPath (data, size, margin) {
+  let path = ''
+  let moveBy = 0
+  let newRow = false
+  let lineLength = 0
+
+  for (let i = 0; i < data.length; i++) {
+    const col = Math.floor(i % size)
+    const row = Math.floor(i / size)
+
+    if (!col && !newRow) newRow = true
+
+    if (data[i]) {
+      lineLength++
+
+      if (!(i > 0 && col > 0 && data[i - 1])) {
+        path += newRow
+          ? svgCmd('M', col + margin, 0.5 + row + margin)
+          : svgCmd('m', moveBy, 0)
+
+        moveBy = 0
+        newRow = false
+      }
+
+      if (!(col + 1 < size && data[i + 1])) {
+        path += svgCmd('h', lineLength)
+        lineLength = 0
+      }
+    } else {
+      moveBy++
+    }
+  }
+
+  return path
+}
+
+exports.render = function render (qrData, options, cb) {
+  const opts = Utils.getOptions(options)
+  const size = qrData.modules.size
+  const data = qrData.modules.data
+  const qrcodesize = size + opts.margin * 2
+
+  const bg = !opts.color.light.a
+    ? ''
+    : '<path ' + getColorAttrib(opts.color.light, 'fill') +
+      ' d="M0 0h' + qrcodesize + 'v' + qrcodesize + 'H0z"/>'
+
+  const path =
+    '<path ' + getColorAttrib(opts.color.dark, 'stroke') +
+    ' d="' + qrToPath(data, size, opts.margin) + '"/>'
+
+  const viewBox = 'viewBox="' + '0 0 ' + qrcodesize + ' ' + qrcodesize + '"'
+
+  const width = !opts.width ? '' : 'width="' + opts.width + '" height="' + opts.width + '" '
+
+  const svgTag = '<svg xmlns="http://www.w3.org/2000/svg" ' + width + viewBox + ' shape-rendering="crispEdges">' + bg + path + '</svg>\n'
+
+  if (typeof cb === 'function') {
+    cb(null, svgTag)
+  }
+
+  return svgTag
+}

extracted-source/node_modules/qrcode/lib/renderer/svg.js

@@ -0,0 +1,19 @@
+const svgTagRenderer = require('./svg-tag')
+
+exports.render = svgTagRenderer.render
+
+exports.renderToFile = function renderToFile (path, qrData, options, cb) {
+  if (typeof cb === 'undefined') {
+    cb = options
+    options = undefined
+  }
+
+  const fs = require('fs')
+  const svgTag = exports.render(qrData, options)
+
+  const xmlStr = '<?xml version="1.0" encoding="utf-8"?>' +
+    '<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">' +
+    svgTag
+
+  fs.writeFile(path, xmlStr, cb)
+}

extracted-source/node_modules/qrcode/lib/renderer/terminal.js

@@ -0,0 +1,9 @@
+const big = require('./terminal/terminal')
+const small = require('./terminal/terminal-small')
+
+exports.render = function (qrData, options, cb) {
+  if (options && options.small) {
+    return small.render(qrData, options, cb)
+  }
+  return big.render(qrData, options, cb)
+}

extracted-source/node_modules/qrcode/lib/renderer/terminal/terminal-small.js

@@ -0,0 +1,85 @@
+const backgroundWhite = '\x1b[47m'
+const backgroundBlack = '\x1b[40m'
+const foregroundWhite = '\x1b[37m'
+const foregroundBlack = '\x1b[30m'
+const reset = '\x1b[0m'
+const lineSetupNormal = backgroundWhite + foregroundBlack // setup colors
+const lineSetupInverse = backgroundBlack + foregroundWhite // setup colors
+
+const createPalette = function (lineSetup, foregroundWhite, foregroundBlack) {
+  return {
+    // 1 ... white, 2 ... black, 0 ... transparent (default)
+
+    '00': reset + ' ' + lineSetup,
+    '01': reset + foregroundWhite + '▄' + lineSetup,
+    '02': reset + foregroundBlack + '▄' + lineSetup,
+    10: reset + foregroundWhite + '▀' + lineSetup,
+    11: ' ',
+    12: '▄',
+    20: reset + foregroundBlack + '▀' + lineSetup,
+    21: '▀',
+    22: '█'
+  }
+}
+
+/**
+ * Returns code for QR pixel
+ * @param {boolean[][]} modules
+ * @param {number} size
+ * @param {number} x
+ * @param {number} y
+ * @return {'0' | '1' | '2'}
+ */
+const mkCodePixel = function (modules, size, x, y) {
+  const sizePlus = size + 1
+  if ((x >= sizePlus) || (y >= sizePlus) || (y < -1) || (x < -1)) return '0'
+  if ((x >= size) || (y >= size) || (y < 0) || (x < 0)) return '1'
+  const idx = (y * size) + x
+  return modules[idx] ? '2' : '1'
+}
+
+/**
+ * Returns code for four QR pixels. Suitable as key in palette.
+ * @param {boolean[][]} modules
+ * @param {number} size
+ * @param {number} x
+ * @param {number} y
+ * @return {keyof palette}
+ */
+const mkCode = function (modules, size, x, y) {
+  return (
+    mkCodePixel(modules, size, x, y) +
+    mkCodePixel(modules, size, x, y + 1)
+  )
+}
+
+exports.render = function (qrData, options, cb) {
+  const size = qrData.modules.size
+  const data = qrData.modules.data
+
+  const inverse = !!(options && options.inverse)
+  const lineSetup = options && options.inverse ? lineSetupInverse : lineSetupNormal
+  const white = inverse ? foregroundBlack : foregroundWhite
+  const black = inverse ? foregroundWhite : foregroundBlack
+
+  const palette = createPalette(lineSetup, white, black)
+  const newLine = reset + '\n' + lineSetup
+
+  let output = lineSetup // setup colors
+
+  for (let y = -1; y < size + 1; y += 2) {
+    for (let x = -1; x < size; x++) {
+      output += palette[mkCode(data, size, x, y)]
+    }
+
+    output += palette[mkCode(data, size, size, y)] + newLine
+  }
+
+  output += reset
+
+  if (typeof cb === 'function') {
+    cb(null, output)
+  }
+
+  return output
+}

extracted-source/node_modules/qrcode/lib/renderer/terminal/terminal.js

@@ -0,0 +1,49 @@
+// let Utils = require('./utils')
+
+exports.render = function (qrData, options, cb) {
+  const size = qrData.modules.size
+  const data = qrData.modules.data
+
+  // let opts = Utils.getOptions(options)
+
+  // use same scheme as https://github.com/gtanner/qrcode-terminal because it actually works! =)
+  const black = '\x1b[40m  \x1b[0m'
+  const white = '\x1b[47m  \x1b[0m'
+
+  let output = ''
+  const hMargin = Array(size + 3).join(white)
+  const vMargin = Array(2).join(white)
+
+  output += hMargin + '\n'
+  for (let i = 0; i < size; ++i) {
+    output += white
+    for (let j = 0; j < size; j++) {
+      // let topModule = data[i * size + j]
+      // let bottomModule = data[(i + 1) * size + j]
+
+      output += data[i * size + j] ? black : white// getBlockChar(topModule, bottomModule)
+    }
+    // output += white+'\n'
+    output += vMargin + '\n'
+  }
+
+  output += hMargin + '\n'
+
+  if (typeof cb === 'function') {
+    cb(null, output)
+  }
+
+  return output
+}
+/*
+exports.renderToFile = function renderToFile (path, qrData, options, cb) {
+  if (typeof cb === 'undefined') {
+    cb = options
+    options = undefined
+  }
+
+  let fs = require('fs')
+  let utf8 = exports.render(qrData, options)
+  fs.writeFile(path, utf8, cb)
+}
+*/

extracted-source/node_modules/qrcode/lib/renderer/utf8.js

@@ -0,0 +1,71 @@
+const Utils = require('./utils')
+
+const BLOCK_CHAR = {
+  WW: ' ',
+  WB: '▄',
+  BB: '█',
+  BW: '▀'
+}
+
+const INVERTED_BLOCK_CHAR = {
+  BB: ' ',
+  BW: '▄',
+  WW: '█',
+  WB: '▀'
+}
+
+function getBlockChar (top, bottom, blocks) {
+  if (top && bottom) return blocks.BB
+  if (top && !bottom) return blocks.BW
+  if (!top && bottom) return blocks.WB
+  return blocks.WW
+}
+
+exports.render = function (qrData, options, cb) {
+  const opts = Utils.getOptions(options)
+  let blocks = BLOCK_CHAR
+  if (opts.color.dark.hex === '#ffffff' || opts.color.light.hex === '#000000') {
+    blocks = INVERTED_BLOCK_CHAR
+  }
+
+  const size = qrData.modules.size
+  const data = qrData.modules.data
+
+  let output = ''
+  let hMargin = Array(size + (opts.margin * 2) + 1).join(blocks.WW)
+  hMargin = Array((opts.margin / 2) + 1).join(hMargin + '\n')
+
+  const vMargin = Array(opts.margin + 1).join(blocks.WW)
+
+  output += hMargin
+  for (let i = 0; i < size; i += 2) {
+    output += vMargin
+    for (let j = 0; j < size; j++) {
+      const topModule = data[i * size + j]
+      const bottomModule = data[(i + 1) * size + j]
+
+      output += getBlockChar(topModule, bottomModule, blocks)
+    }
+
+    output += vMargin + '\n'
+  }
+
+  output += hMargin.slice(0, -1)
+
+  if (typeof cb === 'function') {
+    cb(null, output)
+  }
+
+  return output
+}
+
+exports.renderToFile = function renderToFile (path, qrData, options, cb) {
+  if (typeof cb === 'undefined') {
+    cb = options
+    options = undefined
+  }
+
+  const fs = require('fs')
+  const utf8 = exports.render(qrData, options)
+  fs.writeFile(path, utf8, cb)
+}

extracted-source/node_modules/qrcode/lib/renderer/utils.js

@@ -0,0 +1,99 @@
+function hex2rgba (hex) {
+  if (typeof hex === 'number') {
+    hex = hex.toString()
+  }
+
+  if (typeof hex !== 'string') {
+    throw new Error('Color should be defined as hex string')
+  }
+
+  let hexCode = hex.slice().replace('#', '').split('')
+  if (hexCode.length < 3 || hexCode.length === 5 || hexCode.length > 8) {
+    throw new Error('Invalid hex color: ' + hex)
+  }
+
+  // Convert from short to long form (fff -> ffffff)
+  if (hexCode.length === 3 || hexCode.length === 4) {
+    hexCode = Array.prototype.concat.apply([], hexCode.map(function (c) {
+      return [c, c]
+    }))
+  }
+
+  // Add default alpha value
+  if (hexCode.length === 6) hexCode.push('F', 'F')
+
+  const hexValue = parseInt(hexCode.join(''), 16)
+
+  return {
+    r: (hexValue >> 24) & 255,
+    g: (hexValue >> 16) & 255,
+    b: (hexValue >> 8) & 255,
+    a: hexValue & 255,
+    hex: '#' + hexCode.slice(0, 6).join('')
+  }
+}
+
+exports.getOptions = function getOptions (options) {
+  if (!options) options = {}
+  if (!options.color) options.color = {}
+
+  const margin = typeof options.margin === 'undefined' ||
+    options.margin === null ||
+    options.margin < 0
+    ? 4
+    : options.margin
+
+  const width = options.width && options.width >= 21 ? options.width : undefined
+  const scale = options.scale || 4
+
+  return {
+    width: width,
+    scale: width ? 4 : scale,
+    margin: margin,
+    color: {
+      dark: hex2rgba(options.color.dark || '#000000ff'),
+      light: hex2rgba(options.color.light || '#ffffffff')
+    },
+    type: options.type,
+    rendererOpts: options.rendererOpts || {}
+  }
+}
+
+exports.getScale = function getScale (qrSize, opts) {
+  return opts.width && opts.width >= qrSize + opts.margin * 2
+    ? opts.width / (qrSize + opts.margin * 2)
+    : opts.scale
+}
+
+exports.getImageWidth = function getImageWidth (qrSize, opts) {
+  const scale = exports.getScale(qrSize, opts)
+  return Math.floor((qrSize + opts.margin * 2) * scale)
+}
+
+exports.qrToImageData = function qrToImageData (imgData, qr, opts) {
+  const size = qr.modules.size
+  const data = qr.modules.data
+  const scale = exports.getScale(size, opts)
+  const symbolSize = Math.floor((size + opts.margin * 2) * scale)
+  const scaledMargin = opts.margin * scale
+  const palette = [opts.color.light, opts.color.dark]
+
+  for (let i = 0; i < symbolSize; i++) {
+    for (let j = 0; j < symbolSize; j++) {
+      let posDst = (i * symbolSize + j) * 4
+      let pxColor = opts.color.light
+
+      if (i >= scaledMargin && j >= scaledMargin &&
+        i < symbolSize - scaledMargin && j < symbolSize - scaledMargin) {
+        const iSrc = Math.floor((i - scaledMargin) / scale)
+        const jSrc = Math.floor((j - scaledMargin) / scale)
+        pxColor = palette[data[iSrc * size + jSrc] ? 1 : 0]
+      }
+
+      imgData[posDst++] = pxColor.r
+      imgData[posDst++] = pxColor.g
+      imgData[posDst++] = pxColor.b
+      imgData[posDst] = pxColor.a
+    }
+  }
+}

extracted-source/node_modules/qrcode/lib/server.js

@@ -0,0 +1,138 @@
+const canPromise = require('./can-promise')
+const QRCode = require('./core/qrcode')
+const PngRenderer = require('./renderer/png')
+const Utf8Renderer = require('./renderer/utf8')
+const TerminalRenderer = require('./renderer/terminal')
+const SvgRenderer = require('./renderer/svg')
+
+function checkParams (text, opts, cb) {
+  if (typeof text === 'undefined') {
+    throw new Error('String required as first argument')
+  }
+
+  if (typeof cb === 'undefined') {
+    cb = opts
+    opts = {}
+  }
+
+  if (typeof cb !== 'function') {
+    if (!canPromise()) {
+      throw new Error('Callback required as last argument')
+    } else {
+      opts = cb || {}
+      cb = null
+    }
+  }
+
+  return {
+    opts: opts,
+    cb: cb
+  }
+}
+
+function getTypeFromFilename (path) {
+  return path.slice((path.lastIndexOf('.') - 1 >>> 0) + 2).toLowerCase()
+}
+
+function getRendererFromType (type) {
+  switch (type) {
+    case 'svg':
+      return SvgRenderer
+
+    case 'txt':
+    case 'utf8':
+      return Utf8Renderer
+
+    case 'png':
+    case 'image/png':
+    default:
+      return PngRenderer
+  }
+}
+
+function getStringRendererFromType (type) {
+  switch (type) {
+    case 'svg':
+      return SvgRenderer
+
+    case 'terminal':
+      return TerminalRenderer
+
+    case 'utf8':
+    default:
+      return Utf8Renderer
+  }
+}
+
+function render (renderFunc, text, params) {
+  if (!params.cb) {
+    return new Promise(function (resolve, reject) {
+      try {
+        const data = QRCode.create(text, params.opts)
+        return renderFunc(data, params.opts, function (err, data) {
+          return err ? reject(err) : resolve(data)
+        })
+      } catch (e) {
+        reject(e)
+      }
+    })
+  }
+
+  try {
+    const data = QRCode.create(text, params.opts)
+    return renderFunc(data, params.opts, params.cb)
+  } catch (e) {
+    params.cb(e)
+  }
+}
+
+exports.create = QRCode.create
+
+exports.toCanvas = require('./browser').toCanvas
+
+exports.toString = function toString (text, opts, cb) {
+  const params = checkParams(text, opts, cb)
+  const type = params.opts ? params.opts.type : undefined
+  const renderer = getStringRendererFromType(type)
+  return render(renderer.render, text, params)
+}
+
+exports.toDataURL = function toDataURL (text, opts, cb) {
+  const params = checkParams(text, opts, cb)
+  const renderer = getRendererFromType(params.opts.type)
+  return render(renderer.renderToDataURL, text, params)
+}
+
+exports.toBuffer = function toBuffer (text, opts, cb) {
+  const params = checkParams(text, opts, cb)
+  const renderer = getRendererFromType(params.opts.type)
+  return render(renderer.renderToBuffer, text, params)
+}
+
+exports.toFile = function toFile (path, text, opts, cb) {
+  if (typeof path !== 'string' || !(typeof text === 'string' || typeof text === 'object')) {
+    throw new Error('Invalid argument')
+  }
+
+  if ((arguments.length < 3) && !canPromise()) {
+    throw new Error('Too few arguments provided')
+  }
+
+  const params = checkParams(text, opts, cb)
+  const type = params.opts.type || getTypeFromFilename(path)
+  const renderer = getRendererFromType(type)
+  const renderToFile = renderer.renderToFile.bind(null, path)
+
+  return render(renderToFile, text, params)
+}
+
+exports.toFileStream = function toFileStream (stream, text, opts) {
+  if (arguments.length < 2) {
+    throw new Error('Too few arguments provided')
+  }
+
+  const params = checkParams(text, opts, stream.emit.bind(stream, 'error'))
+  const renderer = getRendererFromType('png') // Only png support for now
+  const renderToFileStream = renderer.renderToFileStream.bind(null, stream)
+  render(renderToFileStream, text, params)
+}