496 lines
15 KiB
JavaScript
496 lines
15 KiB
JavaScript
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const Utils = require('./utils')
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const ECLevel = require('./error-correction-level')
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const BitBuffer = require('./bit-buffer')
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const BitMatrix = require('./bit-matrix')
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const AlignmentPattern = require('./alignment-pattern')
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const FinderPattern = require('./finder-pattern')
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const MaskPattern = require('./mask-pattern')
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const ECCode = require('./error-correction-code')
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const ReedSolomonEncoder = require('./reed-solomon-encoder')
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const Version = require('./version')
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const FormatInfo = require('./format-info')
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const Mode = require('./mode')
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const Segments = require('./segments')
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/**
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* QRCode for JavaScript
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*
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* modified by Ryan Day for nodejs support
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* Copyright (c) 2011 Ryan Day
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*
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* Licensed under the MIT license:
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* http://www.opensource.org/licenses/mit-license.php
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*
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//---------------------------------------------------------------------
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// QRCode for JavaScript
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//
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// Copyright (c) 2009 Kazuhiko Arase
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//
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// URL: http://www.d-project.com/
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//
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// Licensed under the MIT license:
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// http://www.opensource.org/licenses/mit-license.php
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//
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// The word "QR Code" is registered trademark of
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// DENSO WAVE INCORPORATED
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// http://www.denso-wave.com/qrcode/faqpatent-e.html
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//
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//---------------------------------------------------------------------
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*/
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/**
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* Add finder patterns bits to matrix
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*
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* @param {BitMatrix} matrix Modules matrix
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* @param {Number} version QR Code version
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*/
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function setupFinderPattern (matrix, version) {
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const size = matrix.size
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const pos = FinderPattern.getPositions(version)
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for (let i = 0; i < pos.length; i++) {
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const row = pos[i][0]
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const col = pos[i][1]
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for (let r = -1; r <= 7; r++) {
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if (row + r <= -1 || size <= row + r) continue
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for (let c = -1; c <= 7; c++) {
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if (col + c <= -1 || size <= col + c) continue
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if ((r >= 0 && r <= 6 && (c === 0 || c === 6)) ||
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(c >= 0 && c <= 6 && (r === 0 || r === 6)) ||
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(r >= 2 && r <= 4 && c >= 2 && c <= 4)) {
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matrix.set(row + r, col + c, true, true)
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} else {
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matrix.set(row + r, col + c, false, true)
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}
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}
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}
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}
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}
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/**
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* Add timing pattern bits to matrix
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*
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* Note: this function must be called before {@link setupAlignmentPattern}
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*
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* @param {BitMatrix} matrix Modules matrix
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*/
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function setupTimingPattern (matrix) {
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const size = matrix.size
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for (let r = 8; r < size - 8; r++) {
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const value = r % 2 === 0
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matrix.set(r, 6, value, true)
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matrix.set(6, r, value, true)
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}
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}
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/**
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* Add alignment patterns bits to matrix
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*
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* Note: this function must be called after {@link setupTimingPattern}
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*
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* @param {BitMatrix} matrix Modules matrix
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* @param {Number} version QR Code version
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*/
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function setupAlignmentPattern (matrix, version) {
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const pos = AlignmentPattern.getPositions(version)
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for (let i = 0; i < pos.length; i++) {
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const row = pos[i][0]
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const col = pos[i][1]
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for (let r = -2; r <= 2; r++) {
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for (let c = -2; c <= 2; c++) {
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if (r === -2 || r === 2 || c === -2 || c === 2 ||
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(r === 0 && c === 0)) {
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matrix.set(row + r, col + c, true, true)
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} else {
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matrix.set(row + r, col + c, false, true)
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}
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}
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}
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}
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}
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/**
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* Add version info bits to matrix
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*
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* @param {BitMatrix} matrix Modules matrix
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* @param {Number} version QR Code version
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*/
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function setupVersionInfo (matrix, version) {
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const size = matrix.size
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const bits = Version.getEncodedBits(version)
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let row, col, mod
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for (let i = 0; i < 18; i++) {
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row = Math.floor(i / 3)
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col = i % 3 + size - 8 - 3
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mod = ((bits >> i) & 1) === 1
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matrix.set(row, col, mod, true)
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matrix.set(col, row, mod, true)
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}
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}
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/**
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* Add format info bits to matrix
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*
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* @param {BitMatrix} matrix Modules matrix
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* @param {ErrorCorrectionLevel} errorCorrectionLevel Error correction level
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* @param {Number} maskPattern Mask pattern reference value
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*/
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function setupFormatInfo (matrix, errorCorrectionLevel, maskPattern) {
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const size = matrix.size
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const bits = FormatInfo.getEncodedBits(errorCorrectionLevel, maskPattern)
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let i, mod
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for (i = 0; i < 15; i++) {
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mod = ((bits >> i) & 1) === 1
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// vertical
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if (i < 6) {
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matrix.set(i, 8, mod, true)
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} else if (i < 8) {
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matrix.set(i + 1, 8, mod, true)
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} else {
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matrix.set(size - 15 + i, 8, mod, true)
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}
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// horizontal
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if (i < 8) {
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matrix.set(8, size - i - 1, mod, true)
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} else if (i < 9) {
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matrix.set(8, 15 - i - 1 + 1, mod, true)
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} else {
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matrix.set(8, 15 - i - 1, mod, true)
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}
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}
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// fixed module
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matrix.set(size - 8, 8, 1, true)
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}
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/**
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* Add encoded data bits to matrix
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*
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* @param {BitMatrix} matrix Modules matrix
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* @param {Uint8Array} data Data codewords
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*/
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function setupData (matrix, data) {
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const size = matrix.size
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let inc = -1
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let row = size - 1
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let bitIndex = 7
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let byteIndex = 0
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for (let col = size - 1; col > 0; col -= 2) {
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if (col === 6) col--
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while (true) {
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for (let c = 0; c < 2; c++) {
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if (!matrix.isReserved(row, col - c)) {
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let dark = false
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if (byteIndex < data.length) {
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dark = (((data[byteIndex] >>> bitIndex) & 1) === 1)
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}
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matrix.set(row, col - c, dark)
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bitIndex--
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if (bitIndex === -1) {
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byteIndex++
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bitIndex = 7
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}
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}
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}
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row += inc
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if (row < 0 || size <= row) {
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row -= inc
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inc = -inc
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break
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}
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}
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}
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}
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/**
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* Create encoded codewords from data input
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*
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* @param {Number} version QR Code version
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* @param {ErrorCorrectionLevel} errorCorrectionLevel Error correction level
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* @param {ByteData} data Data input
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* @return {Uint8Array} Buffer containing encoded codewords
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*/
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function createData (version, errorCorrectionLevel, segments) {
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// Prepare data buffer
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const buffer = new BitBuffer()
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segments.forEach(function (data) {
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// prefix data with mode indicator (4 bits)
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buffer.put(data.mode.bit, 4)
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// Prefix data with character count indicator.
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// The character count indicator is a string of bits that represents the
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// number of characters that are being encoded.
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// The character count indicator must be placed after the mode indicator
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// and must be a certain number of bits long, depending on the QR version
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// and data mode
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// @see {@link Mode.getCharCountIndicator}.
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buffer.put(data.getLength(), Mode.getCharCountIndicator(data.mode, version))
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// add binary data sequence to buffer
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data.write(buffer)
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})
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// Calculate required number of bits
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const totalCodewords = Utils.getSymbolTotalCodewords(version)
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const ecTotalCodewords = ECCode.getTotalCodewordsCount(version, errorCorrectionLevel)
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const dataTotalCodewordsBits = (totalCodewords - ecTotalCodewords) * 8
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// Add a terminator.
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// If the bit string is shorter than the total number of required bits,
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// a terminator of up to four 0s must be added to the right side of the string.
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// If the bit string is more than four bits shorter than the required number of bits,
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// add four 0s to the end.
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if (buffer.getLengthInBits() + 4 <= dataTotalCodewordsBits) {
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buffer.put(0, 4)
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}
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// If the bit string is fewer than four bits shorter, add only the number of 0s that
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// are needed to reach the required number of bits.
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// After adding the terminator, if the number of bits in the string is not a multiple of 8,
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// pad the string on the right with 0s to make the string's length a multiple of 8.
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while (buffer.getLengthInBits() % 8 !== 0) {
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buffer.putBit(0)
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}
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// Add pad bytes if the string is still shorter than the total number of required bits.
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// Extend the buffer to fill the data capacity of the symbol corresponding to
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// the Version and Error Correction Level by adding the Pad Codewords 11101100 (0xEC)
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// and 00010001 (0x11) alternately.
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const remainingByte = (dataTotalCodewordsBits - buffer.getLengthInBits()) / 8
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for (let i = 0; i < remainingByte; i++) {
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buffer.put(i % 2 ? 0x11 : 0xEC, 8)
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}
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return createCodewords(buffer, version, errorCorrectionLevel)
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}
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/**
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* Encode input data with Reed-Solomon and return codewords with
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* relative error correction bits
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*
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* @param {BitBuffer} bitBuffer Data to encode
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* @param {Number} version QR Code version
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* @param {ErrorCorrectionLevel} errorCorrectionLevel Error correction level
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* @return {Uint8Array} Buffer containing encoded codewords
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*/
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function createCodewords (bitBuffer, version, errorCorrectionLevel) {
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// Total codewords for this QR code version (Data + Error correction)
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const totalCodewords = Utils.getSymbolTotalCodewords(version)
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// Total number of error correction codewords
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const ecTotalCodewords = ECCode.getTotalCodewordsCount(version, errorCorrectionLevel)
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// Total number of data codewords
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const dataTotalCodewords = totalCodewords - ecTotalCodewords
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// Total number of blocks
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const ecTotalBlocks = ECCode.getBlocksCount(version, errorCorrectionLevel)
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// Calculate how many blocks each group should contain
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const blocksInGroup2 = totalCodewords % ecTotalBlocks
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const blocksInGroup1 = ecTotalBlocks - blocksInGroup2
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const totalCodewordsInGroup1 = Math.floor(totalCodewords / ecTotalBlocks)
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const dataCodewordsInGroup1 = Math.floor(dataTotalCodewords / ecTotalBlocks)
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const dataCodewordsInGroup2 = dataCodewordsInGroup1 + 1
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// Number of EC codewords is the same for both groups
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const ecCount = totalCodewordsInGroup1 - dataCodewordsInGroup1
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// Initialize a Reed-Solomon encoder with a generator polynomial of degree ecCount
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const rs = new ReedSolomonEncoder(ecCount)
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let offset = 0
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const dcData = new Array(ecTotalBlocks)
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const ecData = new Array(ecTotalBlocks)
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let maxDataSize = 0
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const buffer = new Uint8Array(bitBuffer.buffer)
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// Divide the buffer into the required number of blocks
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for (let b = 0; b < ecTotalBlocks; b++) {
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const dataSize = b < blocksInGroup1 ? dataCodewordsInGroup1 : dataCodewordsInGroup2
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// extract a block of data from buffer
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dcData[b] = buffer.slice(offset, offset + dataSize)
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// Calculate EC codewords for this data block
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ecData[b] = rs.encode(dcData[b])
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offset += dataSize
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maxDataSize = Math.max(maxDataSize, dataSize)
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}
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// Create final data
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// Interleave the data and error correction codewords from each block
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const data = new Uint8Array(totalCodewords)
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let index = 0
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let i, r
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// Add data codewords
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for (i = 0; i < maxDataSize; i++) {
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for (r = 0; r < ecTotalBlocks; r++) {
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if (i < dcData[r].length) {
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data[index++] = dcData[r][i]
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}
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}
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}
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// Apped EC codewords
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for (i = 0; i < ecCount; i++) {
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for (r = 0; r < ecTotalBlocks; r++) {
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data[index++] = ecData[r][i]
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}
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}
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return data
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}
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/**
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* Build QR Code symbol
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*
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* @param {String} data Input string
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* @param {Number} version QR Code version
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* @param {ErrorCorretionLevel} errorCorrectionLevel Error level
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* @param {MaskPattern} maskPattern Mask pattern
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* @return {Object} Object containing symbol data
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*/
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function createSymbol (data, version, errorCorrectionLevel, maskPattern) {
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let segments
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if (Array.isArray(data)) {
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segments = Segments.fromArray(data)
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} else if (typeof data === 'string') {
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let estimatedVersion = version
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|
||
|
|
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)
|
||
|
|
}
|