@lodestar/utils/lib/bytes.js

Utilities required across multiple lodestar packages

import { toBigIntBE, toBigIntLE, toBufferBE, toBufferLE } from "bigint-buffer";
const hexByByte = [];
/**
 * @deprecated Use toHex() instead.
 */
export function toHexString(bytes) {
    let hex = "0x";
    for (const byte of bytes) {
        if (!hexByByte[byte]) {
            hexByByte[byte] = byte < 16 ? "0" + byte.toString(16) : byte.toString(16);
        }
        hex += hexByByte[byte];
    }
    return hex;
}
/**
 * Return a byte array from a number or BigInt
 */
export function intToBytes(value, length, endianness = "le") {
    return bigIntToBytes(BigInt(value), length, endianness);
}
/**
 * Convert byte array in LE to integer.
 */
export function bytesToInt(value, endianness = "le") {
    return Number(bytesToBigInt(value, endianness));
}
export function bigIntToBytes(value, length, endianness = "le") {
    if (endianness === "le") {
        return toBufferLE(value, length);
    }
    if (endianness === "be") {
        return toBufferBE(value, length);
    }
    throw new Error("endianness must be either 'le' or 'be'");
}
export function bytesToBigInt(value, endianness = "le") {
    if (endianness === "le") {
        return toBigIntLE(value);
    }
    if (endianness === "be") {
        return toBigIntBE(value);
    }
    throw new Error("endianness must be either 'le' or 'be'");
}
export function formatBytes(bytes) {
    if (bytes < 0) {
        throw new Error("bytes must be a positive number, got " + bytes);
    }
    if (bytes === 0) {
        return "0 Bytes";
    }
    // size of a kb
    const k = 1024;
    // only support up to GB
    const units = ["Bytes", "KB", "MB", "GB"];
    const i = Math.min(Math.floor(Math.log(bytes) / Math.log(k)), units.length - 1);
    const formattedSize = (bytes / Math.pow(k, i)).toFixed(2);
    return `${formattedSize} ${units[i]}`;
}
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