| 1 | 'use strict';
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| 2 |
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| 3 | var buffer = require('buffer');
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| 4 | var Buffer = buffer.Buffer;
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| 5 | var SlowBuffer = buffer.SlowBuffer;
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| 6 | var MAX_LEN = buffer.kMaxLength || 2147483647;
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| 7 | exports.alloc = function alloc(size, fill, encoding) {
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| 8 | if (typeof Buffer.alloc === 'function') {
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| 9 | return Buffer.alloc(size, fill, encoding);
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| 10 | }
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| 11 | if (typeof encoding === 'number') {
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| 12 | throw new TypeError('encoding must not be number');
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| 13 | }
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| 14 | if (typeof size !== 'number') {
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| 15 | throw new TypeError('size must be a number');
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| 16 | }
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| 17 | if (size > MAX_LEN) {
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| 18 | throw new RangeError('size is too large');
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| 19 | }
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| 20 | var enc = encoding;
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| 21 | var _fill = fill;
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| 22 | if (_fill === undefined) {
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| 23 | enc = undefined;
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| 24 | _fill = 0;
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| 25 | }
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| 26 | var buf = new Buffer(size);
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| 27 | if (typeof _fill === 'string') {
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| 28 | var fillBuf = new Buffer(_fill, enc);
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| 29 | var flen = fillBuf.length;
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| 30 | var i = -1;
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| 31 | while (++i < size) {
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| 32 | buf[i] = fillBuf[i % flen];
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| 33 | }
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| 34 | } else {
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| 35 | buf.fill(_fill);
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| 36 | }
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| 37 | return buf;
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| 38 | }
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| 39 | exports.allocUnsafe = function allocUnsafe(size) {
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| 40 | if (typeof Buffer.allocUnsafe === 'function') {
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| 41 | return Buffer.allocUnsafe(size);
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| 42 | }
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| 43 | if (typeof size !== 'number') {
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| 44 | throw new TypeError('size must be a number');
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| 45 | }
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| 46 | if (size > MAX_LEN) {
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| 47 | throw new RangeError('size is too large');
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| 48 | }
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| 49 | return new Buffer(size);
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| 50 | }
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| 51 | exports.from = function from(value, encodingOrOffset, length) {
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| 52 | if (typeof Buffer.from === 'function' && (!global.Uint8Array || Uint8Array.from !== Buffer.from)) {
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| 53 | return Buffer.from(value, encodingOrOffset, length);
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| 54 | }
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| 55 | if (typeof value === 'number') {
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| 56 | throw new TypeError('"value" argument must not be a number');
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| 57 | }
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| 58 | if (typeof value === 'string') {
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| 59 | return new Buffer(value, encodingOrOffset);
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| 60 | }
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| 61 | if (typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer) {
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| 62 | var offset = encodingOrOffset;
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| 63 | if (arguments.length === 1) {
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| 64 | return new Buffer(value);
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| 65 | }
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| 66 | if (typeof offset === 'undefined') {
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| 67 | offset = 0;
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| 68 | }
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| 69 | var len = length;
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| 70 | if (typeof len === 'undefined') {
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| 71 | len = value.byteLength - offset;
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| 72 | }
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| 73 | if (offset >= value.byteLength) {
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| 74 | throw new RangeError('\'offset\' is out of bounds');
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| 75 | }
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| 76 | if (len > value.byteLength - offset) {
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| 77 | throw new RangeError('\'length\' is out of bounds');
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| 78 | }
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| 79 | return new Buffer(value.slice(offset, offset + len));
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| 80 | }
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| 81 | if (Buffer.isBuffer(value)) {
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| 82 | var out = new Buffer(value.length);
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| 83 | value.copy(out, 0, 0, value.length);
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| 84 | return out;
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| 85 | }
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| 86 | if (value) {
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| 87 | if (Array.isArray(value) || (typeof ArrayBuffer !== 'undefined' && value.buffer instanceof ArrayBuffer) || 'length' in value) {
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| 88 | return new Buffer(value);
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| 89 | }
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| 90 | if (value.type === 'Buffer' && Array.isArray(value.data)) {
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| 91 | return new Buffer(value.data);
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| 92 | }
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| 93 | }
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| 94 |
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| 95 | throw new TypeError('First argument must be a string, Buffer, ' + 'ArrayBuffer, Array, or array-like object.');
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| 96 | }
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| 97 | exports.allocUnsafeSlow = function allocUnsafeSlow(size) {
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| 98 | if (typeof Buffer.allocUnsafeSlow === 'function') {
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| 99 | return Buffer.allocUnsafeSlow(size);
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| 100 | }
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| 101 | if (typeof size !== 'number') {
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| 102 | throw new TypeError('size must be a number');
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| 103 | }
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| 104 | if (size >= MAX_LEN) {
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| 105 | throw new RangeError('size is too large');
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| 106 | }
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| 107 | return new SlowBuffer(size);
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| 108 | }
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