/
convert.js
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convert.js
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import * as validate from '../types/validate'
/**
* Convert hexadecimal string into uint8Array
* @param {string} str
* @returns {Uint8Array}
*/
export function hexadecimalToUint8Array (str) {
if (typeof str !== 'string') {
throw new TypeError('Wrong data type passed to convertor. Hexadecimal string is expected')
}
if (!validate.validateHexadecimal(str, str.length / 2)) {
throw new TypeError('String of wrong type is passed. Hexadecimal expected.')
}
const uint8arr = new Uint8Array(str.length / 2)
for (let i = 0, j = 0; i < str.length; i += 2, j++) {
uint8arr[j] = parseInt(str.substr(i, 2), 16)
}
return uint8arr
}
/**
* Convert hexadecimal string into binary string
* @param {string} str
* @returns {string}
*/
export function hexadecimalToBinaryString (str) {
let binaryStr = ''
if (typeof str !== 'string') {
throw new TypeError('Wrong data type passed to convertor. Hexadecimal string is expected')
}
if (!validate.validateHexadecimal(str, Math.ceil(str.length / 2))) {
throw new TypeError('String of wrong type is passed. Hexadecimal expected.')
}
let prevBin = null
for (let i = 0; i < str.length; i++) {
let bin = strReverse(parseInt(str[i], 16).toString(2))
while (bin.length < 4) {
bin = bin + '0'
}
if (!prevBin) {
prevBin = bin
} else {
binaryStr += bin + prevBin
prevBin = null
}
}
return binaryStr
}
/**
* Convert uint8Array into string
* @param {Uint8Array} uint8arr
* @returns {string}
*/
export function uint8ArrayToHexadecimal (uint8arr) {
let str = ''
if (!(uint8arr instanceof Uint8Array)) {
throw new TypeError('Wrong data type of array of 8-bit integers. Uint8Array is expected')
}
for (let i = 0; i < uint8arr.length; i++) {
let hex = uint8arr[i].toString(16)
hex = (hex.length === 1) ? '0' + hex : hex
str += hex
}
return str.toLowerCase()
}
/**
* Convert uint8Array into binary string
* @param {Uint8Array} uint8arr
* @returns {string}
*/
export function uint8ArrayToBinaryString (uint8arr) {
let binaryStr = ''
if (!(uint8arr instanceof Uint8Array)) {
throw new TypeError('Wrong data type of array of 8-bit integers. Uint8Array is expected')
}
for (let i = 0; i < uint8arr.length; i++) {
let bin = strReverse(uint8arr[i].toString(2))
while (bin.length < 8) {
bin = bin + '0'
}
binaryStr += bin
}
return binaryStr
}
/**
* Convert binary string into uint8Array
* @param {string} binaryStr
* @returns {Uint8Array}
*/
export function binaryStringToUint8Array (binaryStr) {
const array = []
if (typeof binaryStr !== 'string') {
throw new TypeError('Wrong data type passed to convertor. Binary string is expected')
}
if (!validate.validateBinaryString(binaryStr)) {
throw new TypeError('String of wrong type is passed. Binary string expected.')
}
for (let i = 0; i < binaryStr.length; i += 8) {
array.push(parseInt(strReverse(binaryStr.substr(i, 8)), 2))
}
return new Uint8Array(array)
}
/**
* Convert string into reverse string
* @param str
* @returns {string}
*/
function strReverse (str) {
return str.split('').reverse().join('')
}
/**
* Convert binary string into hexadecimal string
* @param {string} binaryStr
* @returns {string}
*/
export function binaryStringToHexadecimal (binaryStr) {
let str = ''
if (typeof binaryStr !== 'string') {
throw new TypeError('Wrong data type passed to convertor. Binary string is expected')
}
if (!validate.validateBinaryString(binaryStr)) {
throw new TypeError('String of wrong type is passed. Binary string expected.')
}
for (let i = 0; i < binaryStr.length; i += 8) {
let hex = parseInt(strReverse(binaryStr.substr(i, 8)), 2).toString(16)
hex = (hex.length === 1) ? '0' + hex : hex
str += hex
}
return str.toLowerCase()
}
/**
* Convert sting into uint8Array
* @param {string} str
* @param {number} [len] - optional
* @returns {Uint8Array}
*/
export function stringToUint8Array (str, len) {
let array
let from = 0
if (typeof str !== 'string') {
throw new TypeError('Wrong data type passed to convertor. String is expected')
}
if (len > 0) {
array = new Array(len)
array.fill(0)
} else {
array = []
}
for (let i = 0; i < str.length; i++) {
let c = str.charCodeAt(i)
if (c < 128) {
array[from++] = c
} else if (c < 2048) {
array[from++] = (c >> 6) | 192
array[from++] = (c & 63) | 128
} else if (((c & 0xFC00) === 0xD800) && (i + 1) < str.length && ((str.charCodeAt(i + 1) & 0xFC00) === 0xDC00)) {
// surrogate pair
c = 0x10000 + ((c & 0x03FF) << 10) + (str.charCodeAt(++i) & 0x03FF)
array[from++] = (c >> 18) | 240
array[from++] = ((c >> 12) & 63) | 128
array[from++] = ((c >> 6) & 63) | 128
array[from++] = (c & 63) | 128
} else {
array[from++] = (c >> 12) | 224
array[from++] = ((c >> 6) & 63) | 128
array[from++] = (c & 63) | 128
}
}
return new Uint8Array(array)
}