77064f5e5e
* Split core lib into multiple files * Refactor data encoding methods * Refactor data masking process * Improve qr code generation process * Increase minimum required node version to 0.10 * Add linter * Add tests and tests coverage * Update travis config to fix compilation issues * Add examples folder * Add missing license tag in package.json * Update build script and add sourcemap support * Publish only strictly needed files on npm * Update readme
46 lines
1.2 KiB
JavaScript
46 lines
1.2 KiB
JavaScript
var CODEWORDS_COUNT = [
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0, // Not used
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26, 44, 70, 100, 134, 172, 196, 242, 292, 346,
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404, 466, 532, 581, 655, 733, 815, 901, 991, 1085,
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1156, 1258, 1364, 1474, 1588, 1706, 1828, 1921, 2051, 2185,
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2323, 2465, 2611, 2761, 2876, 3034, 3196, 3362, 3532, 3706
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]
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/**
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* Returns the QR Code size for the specified version
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*
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* @param {Number} version QR Code version
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* @return {Number} size of QR code
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*/
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exports.getSymbolSize = function getSymbolSize (version) {
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if (!version) throw new Error('"version" cannot be null or undefined')
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if (version < 1 || version > 40) throw new Error('"version" should be in range from 1 to 40')
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return version * 4 + 17
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}
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/**
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* Returns the total number of codewords used to store data and EC information.
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*
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* @param {Number} version QR Code version
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* @return {Number} Data length in bits
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*/
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exports.getSymbolTotalCodewords = function getSymbolTotalCodewords (version) {
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return CODEWORDS_COUNT[version]
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}
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/**
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* Encode data with Bose-Chaudhuri-Hocquenghem
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*
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* @param {Number} data Value to encode
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* @return {Number} Encoded value
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*/
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exports.getBCHDigit = function (data) {
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var digit = 0
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while (data !== 0) {
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digit++
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data >>>= 1
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}
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return digit
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}
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