@pefish/js-node-assist/lib/buffer.js

assistance tool of node

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const bignumber_js_1 = __importDefault(require("bignumber.js"));
class BufferUtil {
    /**
     * 以hex编码转换为十进制的bytes数组
     * @returns {string}
     */
    static toDecimalNumberArray(src) {
        const temp = this.correctEmptyBuffer(src);
        return [].slice.call(temp);
    }
    /**
     * 以hex编码转化为二进制字符串
     * @returns {string}
     */
    static toBinString(src) {
        const temp = src;
        return this.toDecimalNumberArray(temp).map(function (x) {
            let str = x.toString(2);
            while (str.length < 8) {
                str = '0' + str;
            }
            return str;
        }).join('');
    }
    /**
     * 字节集直接转化为十六进制字符串。
     * @returns {string}
     */
    static toHexString(src, prefix = true) {
        const temp = src.toString('hex');
        if (prefix === false) {
            return temp;
        }
        else {
            return '0x' + temp;
        }
    }
    /**
     * 以hex编码转化为十进制字符串
     * @returns {string}
     */
    static toDecimalString(src) {
        if (this.getBytesLength(src) === 0) {
            return '0';
        }
        return new bignumber_js_1.default(src.toString('hex'), 16).toString(10);
    }
    /**
     * 纠正空buffer
     * @returns {correctEmptyBuffer}
     */
    static correctEmptyBuffer(src) {
        let temp = src;
        if (this.getBytesLength(src) === 0) {
            temp = new Buffer('00', 'hex');
        }
        return temp;
    }
    /**
     * 获取字节数
     */
    static getBytesLength(src) {
        return src.length;
    }
    /**
     * 反转Buffer, 不改变自身
     * @returns {Buffer}
     */
    static reverseBuffer(src) {
        return this.correctEmptyBuffer(this.deepCopy(src)).reverse();
    }
    /**
     * 深拷贝
     * @returns {*}
     */
    static deepCopy(src) {
        const tempBuffer = Buffer.alloc(src.length);
        src.copy(tempBuffer, 0, 0, src.length);
        return tempBuffer;
    }
    static toUint8Array(src) {
        return new Uint8Array(src);
    }
    static toUtf8String(src) {
        return src.toString();
    }
}
exports.default = BufferUtil;
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