@unisat/wallet-sdk/lib/runes/varint.js

UniSat Wallet SDK

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.varint = void 0;
const big_integer_1 = __importDefault(require("big-integer"));
function try_decode(buf) {
    let n = (0, big_integer_1.default)(0);
    let m = (0, big_integer_1.default)(1);
    for (let i = 0;; i++) {
        if (i >= buf.length) {
            throw new Error('Buffer too short');
        }
        let byte = (0, big_integer_1.default)(buf.readUInt8(i));
        n = n.plus(byte.and(0x7f).multiply(m));
        if (byte.and(0x80).equals(0)) {
            return [n.toString(), i + 1];
        }
        m = m.shiftLeft(7);
    }
}
function encodeToVec(n, v) {
    n = (0, big_integer_1.default)(n);
    while (n.shiftRight(7).greater(0)) {
        v.push(n.and(0b01111111).or(0b10000000).toJSNumber());
        n = n.shiftRight(7);
    }
    v.push(n.toJSNumber());
}
function decode(buffer) {
    const ret = try_decode(buffer);
    return { num: ret[0], index: ret[1] };
}
function encode(n) {
    let v = [];
    encodeToVec(n, v);
    return Buffer.from(new Uint8Array(v));
}
exports.varint = {
    encode,
    decode,
    try_decode,
    encodeToVec
};