@ledgerhq/hw-app-vet/lib-es/utils.js

Ledger Hardware Wallet VeChain Application API

import { Buffer } from "buffer";
export const splitPath = (path) => {
    return path
        .split("/")
        .map(elem => {
        let num = parseInt(elem, 10);
        if (elem.length > 1 && elem[elem.length - 1] === "'") {
            num += 0x80000000;
        }
        return num;
    })
        .filter(num => !isNaN(num));
};
export const splitRaw = (path, rawHex, isTransaction) => {
    const contentByteLength = isTransaction ? 0 : 4;
    const paths = splitPath(path);
    let offset = 0;
    const raw = Buffer.from(rawHex, "hex");
    const buffers = [];
    while (offset !== raw.length) {
        const maxChunkSize = offset === 0 ? 255 - 1 - paths.length * 4 - contentByteLength : 255;
        const chunkSize = offset + maxChunkSize > raw.length ? raw.length - offset : maxChunkSize;
        const buffer = Buffer.alloc(offset === 0 ? 1 + paths.length * 4 + contentByteLength + chunkSize : chunkSize);
        if (offset === 0) {
            buffer[0] = paths.length;
            paths.forEach((element, index) => {
                buffer.writeUInt32BE(element, 1 + 4 * index);
            });
            if (isTransaction) {
                raw.copy(buffer, 1 + 4 * paths.length, offset, offset + chunkSize);
            }
            else {
                buffer.writeUInt32BE(raw.length, 1 + 4 * paths.length);
                raw.copy(buffer, 1 + 4 * paths.length + 4, offset, offset + chunkSize);
            }
        }
        else {
            raw.copy(buffer, 0, offset, offset + chunkSize);
        }
        buffers.push(buffer);
        offset += chunkSize;
    }
    return buffers;
};
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