1  /* eslint-disable node/no-deprecated-api */
 2  
 3  'use strict'
 4  
 5  var buffer = require('buffer')
 6  var Buffer = buffer.Buffer
 7  
 8  var safer = {}
 9  
10  var key
11  
12  for (key in buffer) {
13    if (!buffer.hasOwnProperty(key)) continue
14    if (key === 'SlowBuffer' || key === 'Buffer') continue
15    safer[key] = buffer[key]
16  }
17  
18  var Safer = safer.Buffer = {}
19  for (key in Buffer) {
20    if (!Buffer.hasOwnProperty(key)) continue
21    if (key === 'allocUnsafe' || key === 'allocUnsafeSlow') continue
22    Safer[key] = Buffer[key]
23  }
24  
25  safer.Buffer.prototype = Buffer.prototype
26  
27  if (!Safer.from || Safer.from === Uint8Array.from) {
28    Safer.from = function (value, encodingOrOffset, length) {
29      if (typeof value === 'number') {
30        throw new TypeError('The "value" argument must not be of type number. Received type ' + typeof value)
31      }
32      if (value && typeof value.length === 'undefined') {
33        throw new TypeError('The first argument must be one of type string, Buffer, ArrayBuffer, Array, or Array-like Object. Received type ' + typeof value)
34      }
35      return Buffer(value, encodingOrOffset, length)
36    }
37  }
38  
39  if (!Safer.alloc) {
40    Safer.alloc = function (size, fill, encoding) {
41      if (typeof size !== 'number') {
42        throw new TypeError('The "size" argument must be of type number. Received type ' + typeof size)
43      }
44      if (size < 0 || size >= 2 * (1 << 30)) {
45        throw new RangeError('The value "' + size + '" is invalid for option "size"')
46      }
47      var buf = Buffer(size)
48      if (!fill || fill.length === 0) {
49        buf.fill(0)
50      } else if (typeof encoding === 'string') {
51        buf.fill(fill, encoding)
52      } else {
53        buf.fill(fill)
54      }
55      return buf
56    }
57  }
58  
59  if (!safer.kStringMaxLength) {
60    try {
61      safer.kStringMaxLength = process.binding('buffer').kStringMaxLength
62    } catch (e) {
63      // we can't determine kStringMaxLength in environments where process.binding
64      // is unsupported, so let's not set it
65    }
66  }
67  
68  if (!safer.constants) {
69    safer.constants = {
70      MAX_LENGTH: safer.kMaxLength
71    }
72    if (safer.kStringMaxLength) {
73      safer.constants.MAX_STRING_LENGTH = safer.kStringMaxLength
74    }
75  }
76  
77  module.exports = safer