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Текущая директория: /opt/BitGoJS/modules/unspents/dist/src
Просмотр файла: scriptSizes.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.pushdataEncodingLength = pushdataEncodingLength;
exports.compactSize = compactSize;
const types_1 = require("./types");
/**
 * Overhead size for a pushdata element in a script
 * @param i
 */
function pushdataEncodingLength(i) {
    /*
     * https://github.com/bitcoin/bips/blob/master/bip-0062.mediawiki#push-operators
     * Pushing any other byte sequence up to 75 bytes must use the normal data push (opcode byte n, with n the number of bytes, followed n bytes of data being pushed).
     * Pushing 76 to 255 bytes must use OP_PUSHDATA1.
     * Pushing 256 to 520 bytes must use OP_PUSHDATA2.
     * OP_PUSHDATA4 can never be used, as pushes over 520 bytes are not allowed, and those below can be done using other operators.
     */
    if (i < 76) {
        return 1;
    }
    if (i < 255) {
        return 2;
    }
    if (i < 520) {
        return 3;
    }
    throw new Error(`invalid pushdata size`);
}
/**
 * https://developer.bitcoin.org/reference/transactions.html#compactsize-unsigned-integers
 * https://github.com/bitcoinjs/varuint-bitcoin/blob/1d5b253/index.js#L79
 * @param integer
 * @return {number} - The compact size the integer requires when serialized in a transaction
 */
function compactSize(integer) {
    if (!types_1.PositiveInteger.is(integer)) {
        throw new TypeError(`expected positive integer`);
    }
    if (integer <= 252) {
        return 1;
    }
    if (integer <= 0xffff) {
        return 3;
    }
    if (integer <= 0xffffffff) {
        return 5;
    }
    return 9;
}
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