64 lines
1.7 KiB
JavaScript
64 lines
1.7 KiB
JavaScript
export const numberToBytes = (number, bitLength) => {
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const byteCount = Math.ceil(bitLength/8);
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const bytes = [];
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for(let i = 0; i < byteCount; i++) {
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bytes.push((number >> (8 * (byteCount - 1 - i))) & 0xFF);
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}
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return bytes;
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}
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export const numberToHex = (bitLength) => {
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const digits = Math.ceil(bitLength / 4);
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return (number) => '0x' + number.toString(16).padStart(digits, '0').toUpperCase();
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}
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export function numberToBits(number, bitLength) {
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const bits = [];
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for(let i = bitLength - 1; i >= 0; i--)
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bits.push((number >> i) & 1);
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return bits;
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}
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export function bytesToText(bytes) {
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if(!(bytes instanceof ArrayBuffer || ArrayBuffer.isView(bytes))) {
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bytes = new Uint8Array(bytes).buffer;
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}
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return new TextDecoder().decode(bytes);
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}
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export function bytesToBits(bytes) {
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return bytes.reduce((bits, byte) => [
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...bits,
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...byte.toString(2).padStart(8, '0').split('').map(Number)
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], []);
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}
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export function textToBytes(text) {
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return new TextEncoder().encode(text);
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}
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export function textToBits(text) {
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return bytesToBits(textToBytes(text));
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}
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export function bitsToText(bits) {
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const bytes = new Uint8Array(bitsToBytes(bits));
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return bytesToText(bytes.buffer);
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}
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export function bitsToBytes(bits) {
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const bytes = [];
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for(let i = 0; i < bits.length; i+= 8) {
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bytes.push(parseInt(bits.slice(i, i + 8).join(''), 2));
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}
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return bytes;
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}
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export const bitsToInt = (bits, bitLength) => {
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if(bits.length === 0) return 0;
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if(bitLength <= 0) return 0;
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return parseInt(bits
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// only grab the bits we need
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.slice(0, bitLength)
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// combine into string
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.join('')
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// Assume missing bits were zeros
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.padEnd(bitLength, '0'),
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2
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);
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}
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