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import root from './root.js'
/** Detect free variable `exports`. */
/** 检测自由变量“导出” */
const freeExports = typeof exports === 'object' && exports !== null && !exports.nodeType && exports
/** Detect free variable `module`. */
/** 检测自由变量“模块”。 */
const freeModule = freeExports && typeof module === 'object' && module !== null && !module.nodeType && module
/** Detect the popular CommonJS extension `module.exports`. */
/** 检测流行的CommonJS扩展“module.exports” */
const moduleExports = freeModule && freeModule.exports === freeExports
/** Built-in value references. */
/** 内置参考价值。 */
const Buffer = moduleExports ? root.Buffer : undefined, allocUnsafe = Buffer ? Buffer.allocUnsafe : undefined
/**
* Creates a clone of `buffer`.
* 创建一个“buffer”的克隆
* @private
* @param {Buffer} buffer 要克隆的缓冲区.
* @param {boolean} [isDeep] 指定深度克隆.
* @returns {Buffer} 返回克隆的缓冲区.
*/
function cloneBuffer(buffer, isDeep) {
if (isDeep) {
return buffer.slice()
}
const length = buffer.length
const result = allocUnsafe ? allocUnsafe(length) : new buffer.constructor(length)
buffer.copy(result)
return result
}
export default cloneBuffer