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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
| }
| }
|
|
