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1/* eslint-disable node/no-deprecated-api */2 3var toString = Object.prototype.toString4 5var isModern = (6  typeof Buffer !== 'undefined' &&7  typeof Buffer.alloc === 'function' &&8  typeof Buffer.allocUnsafe === 'function' &&9  typeof Buffer.from === 'function'10)11 12function isArrayBuffer (input) {13  return toString.call(input).slice(8, -1) === 'ArrayBuffer'14}15 16function fromArrayBuffer (obj, byteOffset, length) {17  byteOffset >>>= 018 19  var maxLength = obj.byteLength - byteOffset20 21  if (maxLength < 0) {22    throw new RangeError("'offset' is out of bounds")23  }24 25  if (length === undefined) {26    length = maxLength27  } else {28    length >>>= 029 30    if (length > maxLength) {31      throw new RangeError("'length' is out of bounds")32    }33  }34 35  return isModern36    ? Buffer.from(obj.slice(byteOffset, byteOffset + length))37    : new Buffer(new Uint8Array(obj.slice(byteOffset, byteOffset + length)))38}39 40function fromString (string, encoding) {41  if (typeof encoding !== 'string' || encoding === '') {42    encoding = 'utf8'43  }44 45  if (!Buffer.isEncoding(encoding)) {46    throw new TypeError('"encoding" must be a valid string encoding')47  }48 49  return isModern50    ? Buffer.from(string, encoding)51    : new Buffer(string, encoding)52}53 54function bufferFrom (value, encodingOrOffset, length) {55  if (typeof value === 'number') {56    throw new TypeError('"value" argument must not be a number')57  }58 59  if (isArrayBuffer(value)) {60    return fromArrayBuffer(value, encodingOrOffset, length)61  }62 63  if (typeof value === 'string') {64    return fromString(value, encodingOrOffset)65  }66 67  return isModern68    ? Buffer.from(value)69    : new Buffer(value)70}71 72module.exports = bufferFrom73