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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/avalanche/dist/utils

Просмотр файла: base58.js

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Base58 = void 0;
/**
 * @packageDocumentation
 * @module Utils-Base58
 */
const bn_js_1 = __importDefault(require("bn.js"));
const buffer_1 = require("buffer/");
const errors_1 = require("../utils/errors");
/**
 * A Base58 class that uses the cross-platform Buffer module. Built so that Typescript
 * will accept the code.
 *
 * ```js
 * let b58:Base58 = new Base58();
 * let str:string = b58.encode(somebuffer);
 * let buff:Buffer = b58.decode(somestring);
 * ```
 */
class Base58 {
    constructor() {
        this.b58alphabet = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
        this.alphabetIdx0 = "1";
        this.b58 = [
            255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
            255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
            255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
            255, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 255, 255, 255, 255, 255, 255,
            255, 9, 10, 11, 12, 13, 14, 15, 16, 255, 17, 18, 19, 20, 21, 255, 22, 23,
            24, 25, 26, 27, 28, 29, 30, 31, 32, 255, 255, 255, 255, 255, 255, 33, 34,
            35, 36, 37, 38, 39, 40, 41, 42, 43, 255, 44, 45, 46, 47, 48, 49, 50, 51, 52,
            53, 54, 55, 56, 57, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
            255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
            255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
            255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
            255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
            255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
            255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
            255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
            255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
            255, 255
        ];
        this.big58Radix = new bn_js_1.default(58);
        this.bigZero = new bn_js_1.default(0);
        /**
         * Encodes a {@link https://github.com/feross/buffer|Buffer} as a base-58 string
         *
         * @param buff A {@link https://github.com/feross/buffer|Buffer} to encode
         *
         * @returns A base-58 string.
         */
        this.encode = (buff) => {
            let x = new bn_js_1.default(buff.toString("hex"), "hex", "be");
            let answer = ""; // = Buffer.alloc(buff.length*136/100, 0);
            while (x.cmp(this.bigZero) > 0) {
                const mod = x.mod(this.big58Radix);
                x = x.div(this.big58Radix);
                answer += this.b58alphabet[mod.toNumber()];
            }
            for (let i = 0; i < buff.length; i++) {
                if (buff.readUInt8(i) !== 0) {
                    break;
                }
                answer += this.alphabetIdx0;
            }
            return answer.split("").reverse().join("");
        };
        /**
         * Decodes a base-58 into a {@link https://github.com/feross/buffer|Buffer}
         *
         * @param b A base-58 string to decode
         *
         * @returns A {@link https://github.com/feross/buffer|Buffer} from the decoded string.
         */
        this.decode = (b) => {
            const answer = new bn_js_1.default(0);
            const j = new bn_js_1.default(1);
            for (let i = b.length - 1; i >= 0; i--) {
                const tmp = this.b58[b.charCodeAt(i)];
                if (tmp === 255) {
                    throw new errors_1.Base58Error("Error - Base58.decode: not a valid base58 string");
                }
                const scratch = new bn_js_1.default(tmp);
                scratch.imul(j);
                answer.iadd(scratch);
                j.imul(this.big58Radix);
            }
            /* we need to make sure the prefaced 0's are put back to be even in this string */
            let anshex = answer.toString("hex");
            anshex = anshex.length % 2 ? `0${anshex}` : anshex;
            /**
             * We need to replace all zeros that were removed during our conversation process.
             * This ensures the buffer returns is the appropriate length.
             */
            const tmpval = buffer_1.Buffer.from(anshex, "hex");
            let numZeros;
            for (numZeros = 0; numZeros < b.length; numZeros++) {
                if (b[`${numZeros}`] !== this.alphabetIdx0) {
                    break;
                }
            }
            const xlen = numZeros + tmpval.length;
            const result = buffer_1.Buffer.alloc(xlen, 0);
            tmpval.copy(result, numZeros);
            return result;
        };
    }
    /**
     * Retrieves the Base58 singleton.
     */
    static getInstance() {
        if (!Base58.instance) {
            Base58.instance = new Base58();
        }
        return Base58.instance;
    }
}
exports.Base58 = Base58;
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* @packageDocumentation\n * @module Utils-Base58\n */\nimport BN from \"bn.js\"\nimport { Buffer } from \"buffer/\"\nimport { Base58Error } from \"../utils/errors\"\n\n/**\n * A Base58 class that uses the cross-platform Buffer module. Built so that Typescript\n * will accept the code.\n *\n * ```js\n * let b58:Base58 = new Base58();\n * let str:string = b58.encode(somebuffer);\n * let buff:Buffer = b58.decode(somestring);\n * ```\n */\nexport class Base58 {\n  private static instance: Base58\n\n  private constructor() {}\n\n  /**\n   * Retrieves the Base58 singleton.\n   */\n  static getInstance(): Base58 {\n    if (!Base58.instance) {\n      Base58.instance = new Base58()\n    }\n    return Base58.instance\n  }\n\n  protected b58alphabet: string =\n    \"123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz\"\n\n  protected alphabetIdx0 = \"1\"\n\n  protected b58 = [\n    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,\n    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,\n    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,\n    255, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 255, 255, 255, 255, 255, 255,\n    255, 9, 10, 11, 12, 13, 14, 15, 16, 255, 17, 18, 19, 20, 21, 255, 22, 23,\n    24, 25, 26, 27, 28, 29, 30, 31, 32, 255, 255, 255, 255, 255, 255, 33, 34,\n    35, 36, 37, 38, 39, 40, 41, 42, 43, 255, 44, 45, 46, 47, 48, 49, 50, 51, 52,\n    53, 54, 55, 56, 57, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,\n    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,\n    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,\n    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,\n    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,\n    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,\n    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,\n    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,\n    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,\n    255, 255\n  ]\n\n  protected big58Radix: BN = new BN(58)\n\n  protected bigZero: BN = new BN(0)\n\n  /**\n   * Encodes a {@link https://github.com/feross/buffer|Buffer} as a base-58 string\n   *\n   * @param buff A {@link https://github.com/feross/buffer|Buffer} to encode\n   *\n   * @returns A base-58 string.\n   */\n  encode = (buff: Buffer): string => {\n    let x: BN = new BN(buff.toString(\"hex\"), \"hex\", \"be\")\n    let answer: string = \"\" // = Buffer.alloc(buff.length*136/100, 0);\n    while (x.cmp(this.bigZero) > 0) {\n      const mod: BN = x.mod(this.big58Radix)\n      x = x.div(this.big58Radix)\n      answer += this.b58alphabet[mod.toNumber()]\n    }\n\n    for (let i: number = 0; i < buff.length; i++) {\n      if (buff.readUInt8(i) !== 0) {\n        break\n      }\n      answer += this.alphabetIdx0\n    }\n    return answer.split(\"\").reverse().join(\"\")\n  }\n\n  /**\n   * Decodes a base-58 into a {@link https://github.com/feross/buffer|Buffer}\n   *\n   * @param b A base-58 string to decode\n   *\n   * @returns A {@link https://github.com/feross/buffer|Buffer} from the decoded string.\n   */\n  decode = (b: string): Buffer => {\n    const answer: BN = new BN(0)\n    const j: BN = new BN(1)\n\n    for (let i: number = b.length - 1; i >= 0; i--) {\n      const tmp: number = this.b58[b.charCodeAt(i)]\n      if (tmp === 255) {\n        throw new Base58Error(\n          \"Error - Base58.decode: not a valid base58 string\"\n        )\n      }\n      const scratch: BN = new BN(tmp)\n      scratch.imul(j)\n      answer.iadd(scratch)\n      j.imul(this.big58Radix)\n    }\n\n    /* we need to make sure the prefaced 0's are put back to be even in this string */\n    let anshex = answer.toString(\"hex\")\n    anshex = anshex.length % 2 ? `0${anshex}` : anshex\n\n    /**\n     * We need to replace all zeros that were removed during our conversation process.\n     * This ensures the buffer returns is the appropriate length.\n     */\n    const tmpval: Buffer = Buffer.from(anshex, \"hex\")\n    let numZeros: number\n    for (numZeros = 0; numZeros < b.length; numZeros++) {\n      if (b[`${numZeros}`] !== this.alphabetIdx0) {\n        break\n      }\n    }\n    const xlen: number = numZeros + tmpval.length\n    const result: Buffer = Buffer.alloc(xlen, 0)\n    tmpval.copy(result, numZeros)\n\n    return result\n  }\n}\n"]}

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