@ledgerhq/hw-app-btc/lib/varint.js

Ledger Hardware Wallet Bitcoin Application API

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.createVarint = exports.getVarint = void 0;
function getVarint(data, offset) {
    if (data[offset] < 0xfd) {
        return [data[offset], 1];
    }
    if (data[offset] === 0xfd) {
        return [(data[offset + 2] << 8) + data[offset + 1], 3];
    }
    if (data[offset] === 0xfe) {
        return [
            (data[offset + 4] << 24) +
                (data[offset + 3] << 16) +
                (data[offset + 2] << 8) +
                data[offset + 1],
            5,
        ];
    }
    throw new Error("getVarint called with unexpected parameters");
}
exports.getVarint = getVarint;
function createVarint(value) {
    if (value < 0xfd) {
        const buffer = Buffer.alloc(1);
        buffer[0] = value;
        return buffer;
    }
    if (value <= 0xffff) {
        const buffer = Buffer.alloc(3);
        buffer[0] = 0xfd;
        buffer[1] = value & 0xff;
        buffer[2] = (value >> 8) & 0xff;
        return buffer;
    }
    const buffer = Buffer.alloc(5);
    buffer[0] = 0xfe;
    buffer[1] = value & 0xff;
    buffer[2] = (value >> 8) & 0xff;
    buffer[3] = (value >> 16) & 0xff;
    buffer[4] = (value >> 24) & 0xff;
    return buffer;
}
exports.createVarint = createVarint;
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