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| /* | |
| * QrEncoder Javascript library for QrCode generation | |
| * | |
| * Copyright 2015, Vincent Pellé | |
| * | |
| * This program is free software: you can redistribute it and/or modify | |
| * it under the terms of the GNU General Public License as published by | |
| * the Free Software Foundation, either version 3 of the License, or | |
| * (at your option) any later version. | |
| * | |
| * This program is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| * GNU General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU General Public License | |
| * along with this program. If not, see <http://www.gnu.org/licenses/> | |
| * | |
| * pelle.vincent@gmail.com | |
| * | |
| * Includes Javascript QR Encoder | |
| * Copyright 2010, tz@execpc.com, released under GPLv3 | |
| * | |
| * Last modified: Tue Sep 29 22:41:45 MET DST 1998 | |
| */ | |
| 'use strict'; | |
| var CONSTANTS = { | |
| adelta: [ // alignment pattern | |
| 0, 11, 15, 19, 23, 27, 31, // force 1 pat | |
| 16, 18, 20, 22, 24, 26, 28, 20, 22, 24, 24, 26, 28, 28, 22, 24, 24, | |
| 26, 26, 28, 28, 24, 24, 26, 26, 26, 28, 28, 24, 26, 26, 26, 28, 28 | |
| ], | |
| vpat: [ // version block | |
| 0xc94, 0x5bc, 0xa99, 0x4d3, 0xbf6, 0x762, 0x847, 0x60d, | |
| 0x928, 0xb78, 0x45d, 0xa17, 0x532, 0x9a6, 0x683, 0x8c9, | |
| 0x7ec, 0xec4, 0x1e1, 0xfab, 0x08e, 0xc1a, 0x33f, 0xd75, | |
| 0x250, 0x9d5, 0x6f0, 0x8ba, 0x79f, 0xb0b, 0x42e, 0xa64, | |
| 0x541, 0xc69 | |
| ], | |
| fmtword: [ // final format bits with mask: level << 3 | mask | |
| 0x77c4, 0x72f3, 0x7daa, 0x789d, 0x662f, 0x6318, 0x6c41, 0x6976, // L | |
| 0x5412, 0x5125, 0x5e7c, 0x5b4b, 0x45f9, 0x40ce, 0x4f97, 0x4aa0, // M | |
| 0x355f, 0x3068, 0x3f31, 0x3a06, 0x24b4, 0x2183, 0x2eda, 0x2bed, // Q | |
| 0x1689, 0x13be, 0x1ce7, 0x19d0, 0x0762, 0x0255, 0x0d0c, 0x083b // H | |
| ], | |
| eccblocks: [ // 4 per version: number of blocks 1,2; data width; ecc width | |
| 1, 0, 19, 7, 1, 0, 16, 10, 1, 0, 13, 13, 1, 0, 9, 17, | |
| 1, 0, 34, 10, 1, 0, 28, 16, 1, 0, 22, 22, 1, 0, 16, 28, | |
| 1, 0, 55, 15, 1, 0, 44, 26, 2, 0, 17, 18, 2, 0, 13, 22, | |
| 1, 0, 80, 20, 2, 0, 32, 18, 2, 0, 24, 26, 4, 0, 9, 16, | |
| 1, 0, 108, 26, 2, 0, 43, 24, 2, 2, 15, 18, 2, 2, 11, 22, | |
| 2, 0, 68, 18, 4, 0, 27, 16, 4, 0, 19, 24, 4, 0, 15, 28, | |
| 2, 0, 78, 20, 4, 0, 31, 18, 2, 4, 14, 18, 4, 1, 13, 26, | |
| 2, 0, 97, 24, 2, 2, 38, 22, 4, 2, 18, 22, 4, 2, 14, 26, | |
| 2, 0, 116, 30, 3, 2, 36, 22, 4, 4, 16, 20, 4, 4, 12, 24, | |
| 2, 2, 68, 18, 4, 1, 43, 26, 6, 2, 19, 24, 6, 2, 15, 28, | |
| 4, 0, 81, 20, 1, 4, 50, 30, 4, 4, 22, 28, 3, 8, 12, 24, | |
| 2, 2, 92, 24, 6, 2, 36, 22, 4, 6, 20, 26, 7, 4, 14, 28, | |
| 4, 0, 107, 26, 8, 1, 37, 22, 8, 4, 20, 24, 12, 4, 11, 22, | |
| 3, 1, 115, 30, 4, 5, 40, 24, 11, 5, 16, 20, 11, 5, 12, 24, | |
| 5, 1, 87, 22, 5, 5, 41, 24, 5, 7, 24, 30, 11, 7, 12, 24, | |
| 5, 1, 98, 24, 7, 3, 45, 28, 15, 2, 19, 24, 3, 13, 15, 30, | |
| 1, 5, 107, 28, 10, 1, 46, 28, 1, 15, 22, 28, 2, 17, 14, 28, | |
| 5, 1, 120, 30, 9, 4, 43, 26, 17, 1, 22, 28, 2, 19, 14, 28, | |
| 3, 4, 113, 28, 3, 11, 44, 26, 17, 4, 21, 26, 9, 16, 13, 26, | |
| 3, 5, 107, 28, 3, 13, 41, 26, 15, 5, 24, 30, 15, 10, 15, 28, | |
| 4, 4, 116, 28, 17, 0, 42, 26, 17, 6, 22, 28, 19, 6, 16, 30, | |
| 2, 7, 111, 28, 17, 0, 46, 28, 7, 16, 24, 30, 34, 0, 13, 24, | |
| 4, 5, 121, 30, 4, 14, 47, 28, 11, 14, 24, 30, 16, 14, 15, 30, | |
| 6, 4, 117, 30, 6, 14, 45, 28, 11, 16, 24, 30, 30, 2, 16, 30, | |
| 8, 4, 106, 26, 8, 13, 47, 28, 7, 22, 24, 30, 22, 13, 15, 30, | |
| 10, 2, 114, 28, 19, 4, 46, 28, 28, 6, 22, 28, 33, 4, 16, 30, | |
| 8, 4, 122, 30, 22, 3, 45, 28, 8, 26, 23, 30, 12, 28, 15, 30, | |
| 3, 10, 117, 30, 3, 23, 45, 28, 4, 31, 24, 30, 11, 31, 15, 30, | |
| 7, 7, 116, 30, 21, 7, 45, 28, 1, 37, 23, 30, 19, 26, 15, 30, | |
| 5, 10, 115, 30, 19, 10, 47, 28, 15, 25, 24, 30, 23, 25, 15, 30, | |
| 13, 3, 115, 30, 2, 29, 46, 28, 42, 1, 24, 30, 23, 28, 15, 30, | |
| 17, 0, 115, 30, 10, 23, 46, 28, 10, 35, 24, 30, 19, 35, 15, 30, | |
| 17, 1, 115, 30, 14, 21, 46, 28, 29, 19, 24, 30, 11, 46, 15, 30, | |
| 13, 6, 115, 30, 14, 23, 46, 28, 44, 7, 24, 30, 59, 1, 16, 30, | |
| 12, 7, 121, 30, 12, 26, 47, 28, 39, 14, 24, 30, 22, 41, 15, 30, | |
| 6, 14, 121, 30, 6, 34, 47, 28, 46, 10, 24, 30, 2, 64, 15, 30, | |
| 17, 4, 122, 30, 29, 14, 46, 28, 49, 10, 24, 30, 24, 46, 15, 30, | |
| 4, 18, 122, 30, 13, 32, 46, 28, 48, 14, 24, 30, 42, 32, 15, 30, | |
| 20, 4, 117, 30, 40, 7, 47, 28, 43, 22, 24, 30, 10, 67, 15, 30, | |
| 19, 6, 118, 30, 18, 31, 47, 28, 34, 34, 24, 30, 20, 61, 15, 30 | |
| ], | |
| glog: [ // Galois field log table | |
| 0xff, 0x00, 0x01, 0x19, 0x02, 0x32, 0x1a, 0xc6, 0x03, 0xdf, 0x33, 0xee, 0x1b, 0x68, 0xc7, 0x4b, | |
| 0x04, 0x64, 0xe0, 0x0e, 0x34, 0x8d, 0xef, 0x81, 0x1c, 0xc1, 0x69, 0xf8, 0xc8, 0x08, 0x4c, 0x71, | |
| 0x05, 0x8a, 0x65, 0x2f, 0xe1, 0x24, 0x0f, 0x21, 0x35, 0x93, 0x8e, 0xda, 0xf0, 0x12, 0x82, 0x45, | |
| 0x1d, 0xb5, 0xc2, 0x7d, 0x6a, 0x27, 0xf9, 0xb9, 0xc9, 0x9a, 0x09, 0x78, 0x4d, 0xe4, 0x72, 0xa6, | |
| 0x06, 0xbf, 0x8b, 0x62, 0x66, 0xdd, 0x30, 0xfd, 0xe2, 0x98, 0x25, 0xb3, 0x10, 0x91, 0x22, 0x88, | |
| 0x36, 0xd0, 0x94, 0xce, 0x8f, 0x96, 0xdb, 0xbd, 0xf1, 0xd2, 0x13, 0x5c, 0x83, 0x38, 0x46, 0x40, | |
| 0x1e, 0x42, 0xb6, 0xa3, 0xc3, 0x48, 0x7e, 0x6e, 0x6b, 0x3a, 0x28, 0x54, 0xfa, 0x85, 0xba, 0x3d, | |
| 0xca, 0x5e, 0x9b, 0x9f, 0x0a, 0x15, 0x79, 0x2b, 0x4e, 0xd4, 0xe5, 0xac, 0x73, 0xf3, 0xa7, 0x57, | |
| 0x07, 0x70, 0xc0, 0xf7, 0x8c, 0x80, 0x63, 0x0d, 0x67, 0x4a, 0xde, 0xed, 0x31, 0xc5, 0xfe, 0x18, | |
| 0xe3, 0xa5, 0x99, 0x77, 0x26, 0xb8, 0xb4, 0x7c, 0x11, 0x44, 0x92, 0xd9, 0x23, 0x20, 0x89, 0x2e, | |
| 0x37, 0x3f, 0xd1, 0x5b, 0x95, 0xbc, 0xcf, 0xcd, 0x90, 0x87, 0x97, 0xb2, 0xdc, 0xfc, 0xbe, 0x61, | |
| 0xf2, 0x56, 0xd3, 0xab, 0x14, 0x2a, 0x5d, 0x9e, 0x84, 0x3c, 0x39, 0x53, 0x47, 0x6d, 0x41, 0xa2, | |
| 0x1f, 0x2d, 0x43, 0xd8, 0xb7, 0x7b, 0xa4, 0x76, 0xc4, 0x17, 0x49, 0xec, 0x7f, 0x0c, 0x6f, 0xf6, | |
| 0x6c, 0xa1, 0x3b, 0x52, 0x29, 0x9d, 0x55, 0xaa, 0xfb, 0x60, 0x86, 0xb1, 0xbb, 0xcc, 0x3e, 0x5a, | |
| 0xcb, 0x59, 0x5f, 0xb0, 0x9c, 0xa9, 0xa0, 0x51, 0x0b, 0xf5, 0x16, 0xeb, 0x7a, 0x75, 0x2c, 0xd7, | |
| 0x4f, 0xae, 0xd5, 0xe9, 0xe6, 0xe7, 0xad, 0xe8, 0x74, 0xd6, 0xf4, 0xea, 0xa8, 0x50, 0x58, 0xaf | |
| ], | |
| gexp: [ // Galios field exponent table | |
| 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1d, 0x3a, 0x74, 0xe8, 0xcd, 0x87, 0x13, 0x26, | |
| 0x4c, 0x98, 0x2d, 0x5a, 0xb4, 0x75, 0xea, 0xc9, 0x8f, 0x03, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, | |
| 0x9d, 0x27, 0x4e, 0x9c, 0x25, 0x4a, 0x94, 0x35, 0x6a, 0xd4, 0xb5, 0x77, 0xee, 0xc1, 0x9f, 0x23, | |
| 0x46, 0x8c, 0x05, 0x0a, 0x14, 0x28, 0x50, 0xa0, 0x5d, 0xba, 0x69, 0xd2, 0xb9, 0x6f, 0xde, 0xa1, | |
| 0x5f, 0xbe, 0x61, 0xc2, 0x99, 0x2f, 0x5e, 0xbc, 0x65, 0xca, 0x89, 0x0f, 0x1e, 0x3c, 0x78, 0xf0, | |
| 0xfd, 0xe7, 0xd3, 0xbb, 0x6b, 0xd6, 0xb1, 0x7f, 0xfe, 0xe1, 0xdf, 0xa3, 0x5b, 0xb6, 0x71, 0xe2, | |
| 0xd9, 0xaf, 0x43, 0x86, 0x11, 0x22, 0x44, 0x88, 0x0d, 0x1a, 0x34, 0x68, 0xd0, 0xbd, 0x67, 0xce, | |
| 0x81, 0x1f, 0x3e, 0x7c, 0xf8, 0xed, 0xc7, 0x93, 0x3b, 0x76, 0xec, 0xc5, 0x97, 0x33, 0x66, 0xcc, | |
| 0x85, 0x17, 0x2e, 0x5c, 0xb8, 0x6d, 0xda, 0xa9, 0x4f, 0x9e, 0x21, 0x42, 0x84, 0x15, 0x2a, 0x54, | |
| 0xa8, 0x4d, 0x9a, 0x29, 0x52, 0xa4, 0x55, 0xaa, 0x49, 0x92, 0x39, 0x72, 0xe4, 0xd5, 0xb7, 0x73, | |
| 0xe6, 0xd1, 0xbf, 0x63, 0xc6, 0x91, 0x3f, 0x7e, 0xfc, 0xe5, 0xd7, 0xb3, 0x7b, 0xf6, 0xf1, 0xff, | |
| 0xe3, 0xdb, 0xab, 0x4b, 0x96, 0x31, 0x62, 0xc4, 0x95, 0x37, 0x6e, 0xdc, 0xa5, 0x57, 0xae, 0x41, | |
| 0x82, 0x19, 0x32, 0x64, 0xc8, 0x8d, 0x07, 0x0e, 0x1c, 0x38, 0x70, 0xe0, 0xdd, 0xa7, 0x53, 0xa6, | |
| 0x51, 0xa2, 0x59, 0xb2, 0x79, 0xf2, 0xf9, 0xef, 0xc3, 0x9b, 0x2b, 0x56, 0xac, 0x45, 0x8a, 0x09, | |
| 0x12, 0x24, 0x48, 0x90, 0x3d, 0x7a, 0xf4, 0xf5, 0xf7, 0xf3, 0xfb, 0xeb, 0xcb, 0x8b, 0x0b, 0x16, | |
| 0x2c, 0x58, 0xb0, 0x7d, 0xfa, 0xe9, 0xcf, 0x83, 0x1b, 0x36, 0x6c, 0xd8, 0xad, 0x47, 0x8e, 0x00 | |
| ], | |
| badcoeff: [3, 3, 40, 10] | |
| }; | |
| class QrEncoder { | |
| constructor() { | |
| this._strinbuf = []; // data input | |
| this._eccbuf = []; // ecc append | |
| this._qrframe = []; // image working buffer | |
| this._framask = []; // fixed part of image | |
| this._rlens = []; // run lengths for badness | |
| this._genpoly = []; | |
| } | |
| /** | |
| * Getters/Setters | |
| */ | |
| get strinbuf() { return this._strinbuf; } | |
| get eccbuf() { return this._eccbuf; } | |
| get qrframe() { return this._qrframe; } | |
| get framask() { return this._framask; } | |
| get rlens() { return this._rlens; } | |
| get genpoly() { return this._genpoly; } | |
| get ecclevel() { return this._ecclevel; } | |
| get width() { return this._width; } // Control value based on version | |
| set strinbuf(newStrinbuf) { this._strinbuf = newStrinbuf; } | |
| set eccbuf(newEccbuf) { this._eccbuf = newEccbuf; } | |
| set qrframe(newQrframe) { this._qrframe = newQrframe; } | |
| set framask(newFramask) { this._framask = newFramask; } | |
| set rlens(newRlens) { this._rlens = newRlens; } | |
| set genpoly(newGenpoly) { this._genpoly = newGenpoly; } | |
| set ecclevel(newEcclevel) { this._ecclevel = newEcclevel; } | |
| set width(newWidth) { this._width = newWidth; } | |
| /** | |
| * pseudo private methods | |
| */ | |
| // set bit to indicate cell in qrframe is immutable. symetric around diagonal | |
| _setmask(x, y) { | |
| var bt; | |
| if (x > y) { | |
| bt = x; | |
| x = y; | |
| y = bt; | |
| } | |
| // y*y = 1+3+5... | |
| bt = y; | |
| bt *= y; | |
| bt += y; | |
| bt >>= 1; | |
| bt += x; | |
| this.framask[bt] = 1; | |
| } | |
| // enter alignment pattern - black to qrframe, white to mask (later black frame | |
| // merged to mask) | |
| _putalign(x, y) { | |
| var j; | |
| this.qrframe[x + this.width * y] = 1; | |
| for (j = -2; j < 2; j++) { | |
| this.qrframe[(x + j) + this.width * (y - 2)] = 1; | |
| this.qrframe[(x - 2) + this.width * (y + j + 1)] = 1; | |
| this.qrframe[(x + 2) + this.width * (y + j)] = 1; | |
| this.qrframe[(x + j + 1) + this.width * (y + 2)] = 1; | |
| } | |
| for (j = 0; j < 2; j++) { | |
| this._setmask(x - 1, y + j); | |
| this._setmask(x + 1, y - j); | |
| this._setmask(x - j, y - 1); | |
| this._setmask(x + j, y + 1); | |
| } | |
| } | |
| // Reed Solomon error correction | |
| // exponentiation mod N | |
| _modnn(x) { | |
| while (x >= 255) { | |
| x -= 255; | |
| x = (x >> 8) + (x & 255); | |
| } | |
| return x; | |
| } | |
| // Calculate and append ECC data to data block. Block is in strinbuf, indexes to | |
| // buffers given. | |
| _appendrs(data, dlen, ecbuf, eclen) { | |
| var i, j, fb; | |
| for (i = 0; i < eclen; i++) | |
| this.strinbuf[ecbuf + i] = 0; | |
| for (i = 0; i < dlen; i++) { | |
| fb = CONSTANTS["glog"][this.strinbuf[data + i] ^ this.strinbuf[ecbuf]]; | |
| if (fb != 255) /* fb term is non-zero */ | |
| for (j = 1; j < eclen; j++) | |
| this.strinbuf[ecbuf + j - 1] = this.strinbuf[ecbuf + j] ^ CONSTANTS["gexp"][this._modnn(fb + this.genpoly[eclen - j])]; | |
| else | |
| for (j = ecbuf; j < ecbuf + eclen; j++) | |
| this.strinbuf[j] = this.strinbuf[j + 1]; | |
| this.strinbuf[ecbuf + eclen - 1] = fb == 255 ? 0 : CONSTANTS["gexp"][this._modnn(fb + this.genpoly[0])]; | |
| } | |
| } | |
| // ======================================================================== | |
| // Frame data insert following the path rules | |
| // check mask - since symmetrical use half. | |
| _ismasked(x, y) { | |
| var bt; | |
| if (x > y) { | |
| bt = x; | |
| x = y; | |
| y = bt; | |
| } | |
| bt = y; | |
| bt += y * y; | |
| bt >>= 1; | |
| bt += x; | |
| return this.framask[bt]; | |
| } | |
| // ======================================================================== | |
| // Apply the selected mask out of the 8. | |
| _applymask(m) { | |
| var x, y, r3x, r3y; | |
| switch (m) { | |
| case 0: | |
| for (y = 0; y < this.width; y++) | |
| for (x = 0; x < this.width; x++) | |
| if (!((x + y) & 1) && !this._ismasked(x, y)) | |
| this.qrframe[x + y * this.width] ^= 1; | |
| break; | |
| case 1: | |
| for (y = 0; y < this.width; y++) | |
| for (x = 0; x < this.width; x++) | |
| if (!(y & 1) && !this._ismasked(x, y)) | |
| this.qrframe[x + y * this.width] ^= 1; | |
| break; | |
| case 2: | |
| for (y = 0; y < this.width; y++) | |
| for (r3x = 0, x = 0; x < this.width; x++, r3x++) { | |
| if (r3x == 3) | |
| r3x = 0; | |
| if (!r3x && !this._ismasked(x, y)) | |
| this.qrframe[x + y * this.width] ^= 1; | |
| } | |
| break; | |
| case 3: | |
| for (r3y = 0, y = 0; y < this.width; y++, r3y++) { | |
| if (r3y == 3) | |
| r3y = 0; | |
| for (r3x = r3y, x = 0; x < this.width; x++, r3x++) { | |
| if (r3x == 3) | |
| r3x = 0; | |
| if (!r3x && !this._ismasked(x, y)) | |
| this.qrframe[x + y * this.width] ^= 1; | |
| } | |
| } | |
| break; | |
| case 4: | |
| for (y = 0; y < this.width; y++) | |
| for (r3x = 0, r3y = ((y >> 1) & 1), x = 0; x < this.width; x++, r3x++) { | |
| if (r3x == 3) { | |
| r3x = 0; | |
| r3y = !r3y; | |
| } | |
| if (!r3y && !this._ismasked(x, y)) | |
| this.qrframe[x + y * this.width] ^= 1; | |
| } | |
| break; | |
| case 5: | |
| for (r3y = 0, y = 0; y < this.width; y++, r3y++) { | |
| if (r3y == 3) | |
| r3y = 0; | |
| for (r3x = 0, x = 0; x < this.width; x++, r3x++) { | |
| if (r3x == 3) | |
| r3x = 0; | |
| if (!((x & y & 1) + !(!r3x | !r3y)) && !this._ismasked(x, y)) | |
| this.qrframe[x + y * this.width] ^= 1; | |
| } | |
| } | |
| break; | |
| case 6: | |
| for (r3y = 0, y = 0; y < this.width; y++, r3y++) { | |
| if (r3y == 3) | |
| r3y = 0; | |
| for (r3x = 0, x = 0; x < this.width; x++, r3x++) { | |
| if (r3x == 3) | |
| r3x = 0; | |
| if (!(((x & y & 1) + (r3x && (r3x == r3y))) & 1) && !this._ismasked(x, y)) | |
| this.qrframe[x + y * this.width] ^= 1; | |
| } | |
| } | |
| break; | |
| case 7: | |
| for (r3y = 0, y = 0; y < this.width; y++, r3y++) { | |
| if (r3y == 3) | |
| r3y = 0; | |
| for (r3x = 0, x = 0; x < this.width; x++, r3x++) { | |
| if (r3x == 3) | |
| r3x = 0; | |
| if (!(((r3x && (r3x == r3y)) + ((x + y) & 1)) & 1) && !this._ismasked(x, y)) | |
| this.qrframe[x + y * this.width] ^= 1; | |
| } | |
| } | |
| break; | |
| } | |
| return; | |
| } | |
| // Using the table of the length of each run, calculate the amount of bad image | |
| // - long runs or those that look like finders; called twice, once each for X | |
| // and Y | |
| _badruns(length) { | |
| var i, | |
| runsbad = 0; | |
| for (i = 0; i <= length; i++) | |
| if (this.rlens[i] >= 5) | |
| runsbad += CONSTANTS["badcoeff"][0] + this.rlens[i] - 5; | |
| // BwBBBwB as in finder | |
| for (i = 3; i < length - 1; i += 2) | |
| if (this.rlens[i - 2] == this.rlens[i + 2] | |
| && this.rlens[i + 2] == this.rlens[i - 1] | |
| && this.rlens[i - 1] == this.rlens[i + 1] | |
| && this.rlens[i - 1] * 3 == this.rlens[i] | |
| // white around the black pattern? Not part of spec | |
| && (this.rlens[i - 3] == 0 // beginning | |
| || i + 3 > length // end | |
| || this.rlens[i - 3] * 3 >= this.rlens[i] * 4 || this.rlens[i + 3] * 3 >= this.rlens[i] * 4) | |
| ) | |
| runsbad += CONSTANTS["badcoeff"][2]; | |
| return runsbad; | |
| } | |
| // Calculate how bad the masked image is - blocks, imbalance, runs, or finders. | |
| _badcheck() { | |
| var x, y, h, b, b1, | |
| thisbad = 0, | |
| bw = 0; | |
| // blocks of same color. | |
| for (y = 0; y < this.width - 1; y++) | |
| for (x = 0; x < this.width - 1; x++) | |
| if ((this.qrframe[x + this.width * y] && this.qrframe[(x + 1) + this.width * y] | |
| && this.qrframe[x + this.width * (y + 1)] && this.qrframe[(x + 1) + this.width * (y + 1)]) // all | |
| // black | |
| || !(this.qrframe[x + this.width * y] || this.qrframe[(x + 1) + this.width * y] | |
| || this.qrframe[x + this.width * (y + 1)] || this.qrframe[(x + 1) + this.width * (y + 1)])) // all | |
| // white | |
| thisbad += CONSTANTS["badcoeff"][1]; | |
| // X runs | |
| for (y = 0; y < this.width; y++) { | |
| this.rlens[0] = 0; | |
| for (h = b = x = 0; x < this.width; x++) { | |
| if ((b1 = this.qrframe[x + this.width * y]) == b) | |
| this.rlens[h]++; | |
| else | |
| this.rlens[++h] = 1; | |
| b = b1; | |
| bw += b ? 1 : -1; | |
| } | |
| thisbad += this._badruns(h); | |
| } | |
| // black/white imbalance | |
| if (bw < 0) | |
| bw = -bw; | |
| var big = bw; | |
| var count = 0; | |
| big += big << 2; | |
| big <<= 1; | |
| while (big > this.width * this.width) | |
| big -= this.width * this.width, count++; | |
| thisbad += count * CONSTANTS["badcoeff"][3]; | |
| // Y runs | |
| for (x = 0; x < this.width; x++) { | |
| this.rlens[0] = 0; | |
| for (h = b = y = 0; y < this.width; y++) { | |
| if ((b1 = this.qrframe[x + this.width * y]) == b) | |
| this.rlens[h]++; | |
| else | |
| this.rlens[++h] = 1; | |
| b = b1; | |
| } | |
| thisbad += this._badruns(h); | |
| } | |
| return thisbad; | |
| } | |
| _genframe(instring) { | |
| var version = 0; | |
| var x, y, k, t, v, i, j, m; | |
| var neccblk1, neccblk2, datablkw, eccblkwid; // Control values from | |
| // table. | |
| // find the smallest version that fits the string | |
| t = instring.length; | |
| do { | |
| version++; | |
| k = (this.ecclevel - 1) * 4 + (version - 1) * 16; | |
| neccblk1 = CONSTANTS["eccblocks"][k++]; | |
| neccblk2 = CONSTANTS["eccblocks"][k++]; | |
| datablkw = CONSTANTS["eccblocks"][k++]; | |
| eccblkwid = CONSTANTS["eccblocks"][k]; | |
| k = datablkw * (neccblk1 + neccblk2) + neccblk2 - 3 + (version <= 9); | |
| if (t <= k) | |
| break; | |
| } while (version < 40); | |
| // FIXME - insure that it fits insted of being truncated | |
| this.width = 17 + 4 * version; | |
| // allocate, clear and setup data structures | |
| v = datablkw + (datablkw + eccblkwid) * (neccblk1 + neccblk2) + neccblk2; | |
| for (t = 0; t < v; t++) | |
| this.eccbuf[t] = 0; | |
| this.strinbuf = instring.slice(0); | |
| for (t = 0; t < this.width * this.width; t++) | |
| this.qrframe[t] = 0; | |
| for (t = 0; t < (this.width * (this.width + 1) + 1) / 2; t++) | |
| this.framask[t] = 0; | |
| // insert finders - black to frame, white to mask | |
| for (t = 0; t < 3; t++) { | |
| k = 0; | |
| y = 0; | |
| if (t == 1) | |
| k = (this.width - 7); | |
| if (t == 2) | |
| y = (this.width - 7); | |
| this.qrframe[(y + 3) + this.width * (k + 3)] = 1; | |
| for (x = 0; x < 6; x++) { | |
| this.qrframe[(y + x) + this.width * k] = 1; | |
| this.qrframe[y + this.width * (k + x + 1)] = 1; | |
| this.qrframe[(y + 6) + this.width * (k + x)] = 1; | |
| this.qrframe[(y + x + 1) + this.width * (k + 6)] = 1; | |
| } | |
| for (x = 1; x < 5; x++) { | |
| this._setmask(y + x, k + 1); | |
| this._setmask(y + 1, k + x + 1); | |
| this._setmask(y + 5, k + x); | |
| this._setmask(y + x + 1, k + 5); | |
| } | |
| for (x = 2; x < 4; x++) { | |
| this.qrframe[(y + x) + this.width * (k + 2)] = 1; | |
| this.qrframe[(y + 2) + this.width * (k + x + 1)] = 1; | |
| this.qrframe[(y + 4) + this.width * (k + x)] = 1; | |
| this.qrframe[(y + x + 1) + this.width * (k + 4)] = 1; | |
| } | |
| } | |
| // alignment blocks | |
| if (version > 1) { | |
| t = CONSTANTS["adelta"][version]; | |
| y = this.width - 7; | |
| for (; ;) { | |
| x = this.width - 7; | |
| while (x > t - 3) { | |
| this._putalign(x, y); | |
| if (x < t) | |
| break; | |
| x -= t; | |
| } | |
| if (y <= t + 9) | |
| break; | |
| y -= t; | |
| this._putalign(6, y); | |
| this._putalign(y, 6); | |
| } | |
| } | |
| // single black | |
| this.qrframe[8 + this.width * (this.width - 8)] = 1; | |
| // timing gap - mask only | |
| for (y = 0; y < 7; y++) { | |
| this._setmask(7, y); | |
| this._setmask(this.width - 8, y); | |
| this._setmask(7, y + this.width - 7); | |
| } | |
| for (x = 0; x < 8; x++) { | |
| this._setmask(x, 7); | |
| this._setmask(x + this.width - 8, 7); | |
| this._setmask(x, this.width - 8); | |
| } | |
| // reserve mask-format area | |
| for (x = 0; x < 9; x++) | |
| this._setmask(x, 8); | |
| for (x = 0; x < 8; x++) { | |
| this._setmask(x + this.width - 8, 8); | |
| this._setmask(8, x); | |
| } | |
| for (y = 0; y < 7; y++) | |
| this._setmask(8, y + this.width - 7); | |
| // timing row/col | |
| for (x = 0; x < this.width - 14; x++) | |
| if (x & 1) { | |
| this._setmask(8 + x, 6); | |
| this._setmask(6, 8 + x); | |
| } | |
| else { | |
| this.qrframe[(8 + x) + this.width * 6] = 1; | |
| this.qrframe[6 + this.width * (8 + x)] = 1; | |
| } | |
| // version block | |
| if (version > 6) { | |
| t = CONSTANTS["vpat"][version - 7]; | |
| k = 17; | |
| for (x = 0; x < 6; x++) | |
| for (y = 0; y < 3; y++, k--) | |
| if (1 & (k > 11 ? version >> (k - 12) : t >> k)) { | |
| this.qrframe[(5 - x) + this.width * (2 - y + this.width - 11)] = 1; | |
| this.qrframe[(2 - y + this.width - 11) + this.width * (5 - x)] = 1; | |
| } | |
| else { | |
| this._setmask(5 - x, 2 - y + this.width - 11); | |
| this._setmask(2 - y + this.width - 11, 5 - x); | |
| } | |
| } | |
| // sync mask bits - only set above for white spaces, so add in black bits | |
| for (y = 0; y < this.width; y++) | |
| for (x = 0; x <= y; x++) | |
| if (this.qrframe[x + this.width * y]) | |
| this._setmask(x, y); | |
| // convert string to bitstream | |
| // 8 bit data to QR-coded 8 bit data (numeric or alphanum, or kanji not | |
| // supported) | |
| v = this.strinbuf.length; | |
| // string to array | |
| for (i = 0; i < v; i++) | |
| this.eccbuf[i] = this.strinbuf.charCodeAt(i); | |
| this.strinbuf = this.eccbuf.slice(0); | |
| // calculate max string length | |
| x = datablkw * (neccblk1 + neccblk2) + neccblk2; | |
| if (v >= x - 2) { | |
| v = x - 2; | |
| if (version > 9) | |
| v--; | |
| } | |
| // shift and repack to insert length prefix | |
| i = v; | |
| if (version > 9) { | |
| this.strinbuf[i + 2] = 0; | |
| this.strinbuf[i + 3] = 0; | |
| while (i--) { | |
| t = this.strinbuf[i]; | |
| this.strinbuf[i + 3] |= 255 & (t << 4); | |
| this.strinbuf[i + 2] = t >> 4; | |
| } | |
| this.strinbuf[2] |= 255 & (v << 4); | |
| this.strinbuf[1] = v >> 4; | |
| this.strinbuf[0] = 0x40 | (v >> 12); | |
| } | |
| else { | |
| this.strinbuf[i + 1] = 0; | |
| this.strinbuf[i + 2] = 0; | |
| while (i--) { | |
| t = this.strinbuf[i]; | |
| this.strinbuf[i + 2] |= 255 & (t << 4); | |
| this.strinbuf[i + 1] = t >> 4; | |
| } | |
| this.strinbuf[1] |= 255 & (v << 4); | |
| this.strinbuf[0] = 0x40 | (v >> 4); | |
| } | |
| // fill to end with pad pattern | |
| i = v + 3 - (version < 10); | |
| while (i < x) { | |
| this.strinbuf[i++] = 0xec; | |
| // buffer has room if (i == x) break; | |
| this.strinbuf[i++] = 0x11; | |
| } | |
| // calculate and append ECC | |
| // calculate generator polynomial | |
| this.genpoly[0] = 1; | |
| for (i = 0; i < eccblkwid; i++) { | |
| this.genpoly[i + 1] = 1; | |
| for (j = i; j > 0; j--) | |
| this.genpoly[j] = this.genpoly[j] | |
| ? this.genpoly[j - 1] ^ CONSTANTS["gexp"][this._modnn(CONSTANTS["glog"][this.genpoly[j]] + i)] : this.genpoly[j - 1]; | |
| this.genpoly[0] = CONSTANTS["gexp"][this._modnn(CONSTANTS["glog"][this.genpoly[0]] + i)]; | |
| } | |
| for (i = 0; i <= eccblkwid; i++) | |
| this.genpoly[i] = CONSTANTS["glog"][this.genpoly[i]]; // use logs for | |
| // genpoly[] to | |
| // save calc | |
| // step | |
| // append ecc to data buffer | |
| k = x; | |
| y = 0; | |
| for (i = 0; i < neccblk1; i++) { | |
| this._appendrs(y, datablkw, k, eccblkwid); | |
| y += datablkw; | |
| k += eccblkwid; | |
| } | |
| for (i = 0; i < neccblk2; i++) { | |
| this._appendrs(y, datablkw + 1, k, eccblkwid); | |
| y += datablkw + 1; | |
| k += eccblkwid; | |
| } | |
| // interleave blocks | |
| y = 0; | |
| for (i = 0; i < datablkw; i++) { | |
| for (j = 0; j < neccblk1; j++) | |
| this.eccbuf[y++] = this.strinbuf[i + j * datablkw]; | |
| for (j = 0; j < neccblk2; j++) | |
| this.eccbuf[y++] = this.strinbuf[(neccblk1 * datablkw) + i + (j * (datablkw + 1))]; | |
| } | |
| for (j = 0; j < neccblk2; j++) | |
| this.eccbuf[y++] = this.strinbuf[(neccblk1 * datablkw) + i + (j * (datablkw + 1))]; | |
| for (i = 0; i < eccblkwid; i++) | |
| for (j = 0; j < neccblk1 + neccblk2; j++) | |
| this.eccbuf[y++] = this.strinbuf[x + i + j * eccblkwid]; | |
| this.strinbuf = this.eccbuf; | |
| // pack bits into frame avoiding masked area. | |
| x = y = this.width - 1; | |
| k = v = 1; // up, minus | |
| /* inteleaved data and ecc codes */ | |
| m = (datablkw + eccblkwid) * (neccblk1 + neccblk2) + neccblk2; | |
| for (i = 0; i < m; i++) { | |
| t = this.strinbuf[i]; | |
| for (j = 0; j < 8; j++, t <<= 1) { | |
| if (0x80 & t) | |
| this.qrframe[x + this.width * y] = 1; | |
| do { // find next fill position | |
| if (v) | |
| x--; | |
| else { | |
| x++; | |
| if (k) { | |
| if (y != 0) | |
| y--; | |
| else { | |
| x -= 2; | |
| k = !k; | |
| if (x == 6) { | |
| x--; | |
| y = 9; | |
| } | |
| } | |
| } | |
| else { | |
| if (y != this.width - 1) | |
| y++; | |
| else { | |
| x -= 2; | |
| k = !k; | |
| if (x == 6) { | |
| x--; | |
| y -= 8; | |
| } | |
| } | |
| } | |
| } | |
| v = !v; | |
| } while (this._ismasked(x, y)); | |
| } | |
| } | |
| // save pre-mask copy of frame | |
| this.strinbuf = this.qrframe.slice(0); | |
| t = 0; // best | |
| y = 30000; // demerit | |
| // for instead of while since in original arduino code | |
| // if an early mask was "good enough" it wouldn't try for a better one | |
| // since they get more complex and take longer. | |
| for (k = 0; k < 8; k++) { | |
| this._applymask(k); // returns black-white imbalance | |
| x = this._badcheck(); | |
| if (x < y) { // current mask better than previous best? | |
| y = x; | |
| t = k; | |
| } | |
| if (t == 7) | |
| break; // don't increment i to a void redoing mask | |
| this.qrframe = this.strinbuf.slice(0); // reset for next pass | |
| } | |
| if (t != k) // redo best mask - none good enough, last wasn't t | |
| this._applymask(t); | |
| // add in final mask/ecclevel bytes | |
| y = CONSTANTS["fmtword"][t + ((this.ecclevel - 1) << 3)]; | |
| // low byte | |
| for (k = 0; k < 8; k++, y >>= 1) | |
| if (y & 1) { | |
| this.qrframe[(this.width - 1 - k) + this.width * 8] = 1; | |
| if (k < 6) | |
| this.qrframe[8 + this.width * k] = 1; | |
| else | |
| this.qrframe[8 + this.width * (k + 1)] = 1; | |
| } | |
| // high byte | |
| for (k = 0; k < 7; k++, y >>= 1) | |
| if (y & 1) { | |
| this.qrframe[8 + this.width * (this.width - 7 + k)] = 1; | |
| if (k) | |
| this.qrframe[(6 - k) + this.width * 8] = 1; | |
| else | |
| this.qrframe[7 + this.width * 8] = 1; | |
| } | |
| // return image | |
| return this.qrframe; | |
| } | |
| /** | |
| * Public methods | |
| */ | |
| encode(instring, ecclevel) { | |
| var i, j; | |
| var hash = []; | |
| if (instring == undefined) throw new Error('no string passed'); | |
| this.ecclevel = (ecclevel == undefined) ? 1 : ecclevel; | |
| if (this.ecclevel < 1 || this.ecclevel > 4) throw new Error('wrong ecclevel'); | |
| var frame = this._genframe(instring); | |
| for (i = 0; i < this.width; i++) { | |
| hash.push(frame.slice(i * this.width, this.width + (i * this.width))); | |
| } | |
| return hash; | |
| } | |
| } | |
| function braille_pattern(blocks) | |
| { | |
| if(!(blocks instanceof Array) || blocks.length > 8 || blocks.length < 0) | |
| throw new TypeError("Only accept an array in max of 8 elements with 0/1 or true/false."); | |
| // value table | |
| const table = [1, 2, 4, 64, 8, 16, 32, 128]; | |
| // codepoint offset | |
| let offset = 0; | |
| // calculate | |
| blocks.forEach((val, i) => { | |
| if(val == 1 || val == true) offset += table[i]; | |
| }); | |
| // eval to character | |
| return String.fromCodePoint(0x2800 + offset); | |
| } | |
| const e = new QrEncoder() | |
| const result = e.encode('https://gist.github.com/TheSnowfield/39957c8fae5b9a26b2d22ac68b4577f1', 4) | |
| const transformed = [] | |
| for (let y = 0; y < result.length / 4; y++) { | |
| const line = [] | |
| for (let x = 0; x < result.length / 2; x++) { | |
| const chunk = [] | |
| for (let px = 0; px < 2; px++) { | |
| for (let py = 0; py < 4; py++) { | |
| chunk.push((result[y * 4 + py] || [])[x * 2 + px] || 0) | |
| } | |
| } | |
| line.push(braille_pattern(chunk)) | |
| } | |
| transformed.push(line) | |
| } | |
| console.log(transformed.map(v => v.join('')).join('\n')) |
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