3 var buffer = require('buffer');
4 var Buffer = buffer.Buffer;
5 var SlowBuffer = buffer.SlowBuffer;
6 var MAX_LEN = buffer.kMaxLength || 2147483647;
7 exports.alloc = function alloc(size, fill, encoding) {
8 if (typeof Buffer.alloc === 'function') {
9 return Buffer.alloc(size, fill, encoding);
11 if (typeof encoding === 'number') {
12 throw new TypeError('encoding must not be number');
14 if (typeof size !== 'number') {
15 throw new TypeError('size must be a number');
18 throw new RangeError('size is too large');
22 if (_fill === undefined) {
26 var buf = new Buffer(size);
27 if (typeof _fill === 'string') {
28 var fillBuf = new Buffer(_fill, enc);
29 var flen = fillBuf.length;
32 buf[i] = fillBuf[i % flen];
39 exports.allocUnsafe = function allocUnsafe(size) {
40 if (typeof Buffer.allocUnsafe === 'function') {
41 return Buffer.allocUnsafe(size);
43 if (typeof size !== 'number') {
44 throw new TypeError('size must be a number');
47 throw new RangeError('size is too large');
49 return new Buffer(size);
51 exports.from = function from(value, encodingOrOffset, length) {
52 if (typeof Buffer.from === 'function' && (!global.Uint8Array || Uint8Array.from !== Buffer.from)) {
53 return Buffer.from(value, encodingOrOffset, length);
55 if (typeof value === 'number') {
56 throw new TypeError('"value" argument must not be a number');
58 if (typeof value === 'string') {
59 return new Buffer(value, encodingOrOffset);
61 if (typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer) {
62 var offset = encodingOrOffset;
63 if (arguments.length === 1) {
64 return new Buffer(value);
66 if (typeof offset === 'undefined') {
70 if (typeof len === 'undefined') {
71 len = value.byteLength - offset;
73 if (offset >= value.byteLength) {
74 throw new RangeError('\'offset\' is out of bounds');
76 if (len > value.byteLength - offset) {
77 throw new RangeError('\'length\' is out of bounds');
79 return new Buffer(value.slice(offset, offset + len));
81 if (Buffer.isBuffer(value)) {
82 var out = new Buffer(value.length);
83 value.copy(out, 0, 0, value.length);
87 if (Array.isArray(value) || (typeof ArrayBuffer !== 'undefined' && value.buffer instanceof ArrayBuffer) || 'length' in value) {
88 return new Buffer(value);
90 if (value.type === 'Buffer' && Array.isArray(value.data)) {
91 return new Buffer(value.data);
95 throw new TypeError('First argument must be a string, Buffer, ' + 'ArrayBuffer, Array, or array-like object.');
97 exports.allocUnsafeSlow = function allocUnsafeSlow(size) {
98 if (typeof Buffer.allocUnsafeSlow === 'function') {
99 return Buffer.allocUnsafeSlow(size);
101 if (typeof size !== 'number') {
102 throw new TypeError('size must be a number');
104 if (size >= MAX_LEN) {
105 throw new RangeError('size is too large');
107 return new SlowBuffer(size);