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• [DIR] ..
• [FILE] base64.native.js
• [FILE] hex.browser.js
• [FILE] hex.js
• [FILE] hex.native.js
• [FILE] utf8.browser.js
• [FILE] utf8.js
• [FILE] utf8.native.js

Просмотр файла: hex.js

/*-
 * ‌
 * Hedera JavaScript SDK
 * ​
 * Copyright (C) 2020 - 2022 Hedera Hashgraph, LLC
 * ​
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ‍
 */

/**
 * @param {Uint8Array} data
 * @returns {string}
 */
export function encode(data) {
    return Buffer.from(data).toString("hex");
}

/**
 * @param {string} text
 * @returns {Uint8Array}
 */
export function decode(text) {
    const str = text.startsWith("0x") ? text.substring(2) : text;
    return Buffer.from(str, "hex");
}

/**
 * Encode with a specified length. Supports zero padding if the most significant byte is 0
 *
 * https://github.com/ethers-io/ethers.js/blob/master/packages/bytes/src.ts/index.ts#L315
 *
 * @param {Uint8Array} value
 * @param {number} length
 * @returns {string}
 */
export function hexZeroPadded(value, length) {
    const HexCharacters = "0123456789abcdef";

    // https://github.com/ethers-io/ethers.js/blob/master/packages/bytes/src.ts/index.ts#L243
    let result = "0x";
    for (let i = 0; i < value.length; i++) {
        let v = value[i];
        result += HexCharacters[(v & 0xf0) >> 4] + HexCharacters[v & 0x0f];
    }

    // https://github.com/ethers-io/ethers.js/blob/master/packages/bytes/src.ts/index.ts#L315
    if (result.length > 2 * length + 2) {
        console.log("result out of range", "result");
    }

    while (result.length < 2 * length + 2) {
        result = "0x0" + result.substring(2);
    }

    return result.substring(2);
}

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