16 KiB
buffer 
The buffer module from node.js, for the browser.
With browserify, simply require('buffer') or use the Buffer global and you will get this module.
The goal is to provide an API that is 100% identical to node's Buffer API. Read the official docs for the full list of properties, instance methods, and class methods that are supported.
features
- Manipulate binary data like a boss, in all browsers -- even IE6!
- Super fast. Backed by Typed Arrays (
Uint8Array/ArrayBuffer, notObject) - Extremely small bundle size (5.04KB minified + gzipped, 35.5KB with comments)
- Excellent browser support (IE 6+, Chrome 4+, Firefox 3+, Safari 5.1+, Opera 11+, iOS, etc.)
- Preserves Node API exactly, with one minor difference (see below)
- Square-bracket
buf[4]notation works, even in old browsers like IE6! - Does not modify any browser prototypes or put anything on
window - Comprehensive test suite (including all buffer tests from node.js core)
install
To use this module directly (without browserify), install it:
npm install buffer
This module was previously called native-buffer-browserify, but please use buffer from now on.
A standalone bundle is available here, for non-browserify users.
usage
The module's API is identical to node's Buffer API. Read the
official docs for the full list of properties,
instance methods, and class methods that are supported.
As mentioned above, require('buffer') or use the Buffer global with
browserify and this module will automatically be included
in your bundle. Almost any npm module will work in the browser, even if it assumes that
the node Buffer API will be available.
To depend on this module explicitly (without browserify), require it like this:
var Buffer = require('buffer/').Buffer // note: the trailing slash is important!
To require this module explicitly, use require('buffer/') which tells the node.js module
lookup algorithm (also used by browserify) to use the npm module named buffer
instead of the node.js core module named buffer!
how does it work?
The Buffer constructor returns instances of Uint8Array that have their prototype
changed to Buffer.prototype. Furthermore, Buffer is a subclass of Uint8Array,
so the returned instances will have all the node Buffer methods and the
Uint8Array methods. Square bracket notation works as expected -- it returns a
single octet.
The Uint8Array prototype remains unmodified.
one minor difference
In old browsers, buf.slice() does not modify parent buffer's memory
If you only support modern browsers (specifically, those with typed array support), then this issue does not affect you. If you support super old browsers, then read on.
In node, the slice() method returns a new Buffer that shares underlying memory
with the original Buffer. When you modify one buffer, you modify the other.
Read more.
In browsers with typed array support, this Buffer implementation supports this
behavior. In browsers without typed arrays, an alternate buffer implementation is
used that is based on Object which has no mechanism to point separate
Buffers to the same underlying slab of memory.
You can see which browser versions lack typed array support here.
tracking the latest node api
This module tracks the Buffer API in the latest (unstable) version of node.js. The Buffer API is considered stable in the node stability index, so it is unlikely that there will ever be breaking changes. Nonetheless, when/if the Buffer API changes in node, this module's API will change accordingly.
related packages
buffer-equals- Node.js 0.12 buffer.equals() ponyfillbuffer-reverse- A lite module for reverse-operations on buffersbuffer-xor- A simple module for bitwise-xor on buffersis-buffer- Determine if an object is a Buffer without including the wholeBufferpackagetypedarray-to-buffer- Convert a typed array to a Buffer without a copy
performance
See perf tests in /perf.
BrowserBuffer is the browser buffer module (this repo). Uint8Array is included as a
sanity check (since BrowserBuffer uses Uint8Array under the hood, Uint8Array will
always be at least a bit faster). Finally, NodeBuffer is the node.js buffer module,
which is included to compare against.
NOTE: Performance has improved since these benchmarks were taken. PR welcoem to update the README.
Chrome 38
| Method | Operations | Accuracy | Sampled | Fastest |
|---|---|---|---|---|
| BrowserBuffer#bracket-notation | 11,457,464 ops/sec | ±0.86% | 66 | ✓ |
| Uint8Array#bracket-notation | 10,824,332 ops/sec | ±0.74% | 65 | |
| BrowserBuffer#concat | 450,532 ops/sec | ±0.76% | 68 | |
| Uint8Array#concat | 1,368,911 ops/sec | ±1.50% | 62 | ✓ |
| BrowserBuffer#copy(16000) | 903,001 ops/sec | ±0.96% | 67 | |
| Uint8Array#copy(16000) | 1,422,441 ops/sec | ±1.04% | 66 | ✓ |
| BrowserBuffer#copy(16) | 11,431,358 ops/sec | ±0.46% | 69 | |
| Uint8Array#copy(16) | 13,944,163 ops/sec | ±1.12% | 68 | ✓ |
| BrowserBuffer#new(16000) | 106,329 ops/sec | ±6.70% | 44 | |
| Uint8Array#new(16000) | 131,001 ops/sec | ±2.85% | 31 | ✓ |
| BrowserBuffer#new(16) | 1,554,491 ops/sec | ±1.60% | 65 | |
| Uint8Array#new(16) | 6,623,930 ops/sec | ±1.66% | 65 | ✓ |
| BrowserBuffer#readDoubleBE | 112,830 ops/sec | ±0.51% | 69 | ✓ |
| DataView#getFloat64 | 93,500 ops/sec | ±0.57% | 68 | |
| BrowserBuffer#readFloatBE | 146,678 ops/sec | ±0.95% | 68 | ✓ |
| DataView#getFloat32 | 99,311 ops/sec | ±0.41% | 67 | |
| BrowserBuffer#readUInt32LE | 843,214 ops/sec | ±0.70% | 69 | ✓ |
| DataView#getUint32 | 103,024 ops/sec | ±0.64% | 67 | |
| BrowserBuffer#slice | 1,013,941 ops/sec | ±0.75% | 67 | |
| Uint8Array#subarray | 1,903,928 ops/sec | ±0.53% | 67 | ✓ |
| BrowserBuffer#writeFloatBE | 61,387 ops/sec | ±0.90% | 67 | |
| DataView#setFloat32 | 141,249 ops/sec | ±0.40% | 66 | ✓ |
Firefox 33
| Method | Operations | Accuracy | Sampled | Fastest |
|---|---|---|---|---|
| BrowserBuffer#bracket-notation | 20,800,421 ops/sec | ±1.84% | 60 | |
| Uint8Array#bracket-notation | 20,826,235 ops/sec | ±2.02% | 61 | ✓ |
| BrowserBuffer#concat | 153,076 ops/sec | ±2.32% | 61 | |
| Uint8Array#concat | 1,255,674 ops/sec | ±8.65% | 52 | ✓ |
| BrowserBuffer#copy(16000) | 1,105,312 ops/sec | ±1.16% | 63 | |
| Uint8Array#copy(16000) | 1,615,911 ops/sec | ±0.55% | 66 | ✓ |
| BrowserBuffer#copy(16) | 16,357,599 ops/sec | ±0.73% | 68 | |
| Uint8Array#copy(16) | 31,436,281 ops/sec | ±1.05% | 68 | ✓ |
| BrowserBuffer#new(16000) | 52,995 ops/sec | ±6.01% | 35 | |
| Uint8Array#new(16000) | 87,686 ops/sec | ±5.68% | 45 | ✓ |
| BrowserBuffer#new(16) | 252,031 ops/sec | ±1.61% | 66 | |
| Uint8Array#new(16) | 8,477,026 ops/sec | ±0.49% | 68 | ✓ |
| BrowserBuffer#readDoubleBE | 99,871 ops/sec | ±0.41% | 69 | |
| DataView#getFloat64 | 285,663 ops/sec | ±0.70% | 68 | ✓ |
| BrowserBuffer#readFloatBE | 115,540 ops/sec | ±0.42% | 69 | |
| DataView#getFloat32 | 288,722 ops/sec | ±0.82% | 68 | ✓ |
| BrowserBuffer#readUInt32LE | 633,926 ops/sec | ±1.08% | 67 | ✓ |
| DataView#getUint32 | 294,808 ops/sec | ±0.79% | 64 | |
| BrowserBuffer#slice | 349,425 ops/sec | ±0.46% | 69 | |
| Uint8Array#subarray | 5,965,819 ops/sec | ±0.60% | 65 | ✓ |
| BrowserBuffer#writeFloatBE | 59,980 ops/sec | ±0.41% | 67 | |
| DataView#setFloat32 | 317,634 ops/sec | ±0.63% | 68 | ✓ |
Safari 8
| Method | Operations | Accuracy | Sampled | Fastest |
|---|---|---|---|---|
| BrowserBuffer#bracket-notation | 10,279,729 ops/sec | ±2.25% | 56 | ✓ |
| Uint8Array#bracket-notation | 10,030,767 ops/sec | ±2.23% | 59 | |
| BrowserBuffer#concat | 144,138 ops/sec | ±1.38% | 65 | |
| Uint8Array#concat | 4,950,764 ops/sec | ±1.70% | 63 | ✓ |
| BrowserBuffer#copy(16000) | 1,058,548 ops/sec | ±1.51% | 64 | |
| Uint8Array#copy(16000) | 1,409,666 ops/sec | ±1.17% | 65 | ✓ |
| BrowserBuffer#copy(16) | 6,282,529 ops/sec | ±1.88% | 58 | |
| Uint8Array#copy(16) | 11,907,128 ops/sec | ±2.87% | 58 | ✓ |
| BrowserBuffer#new(16000) | 101,663 ops/sec | ±3.89% | 57 | |
| Uint8Array#new(16000) | 22,050,818 ops/sec | ±6.51% | 46 | ✓ |
| BrowserBuffer#new(16) | 176,072 ops/sec | ±2.13% | 64 | |
| Uint8Array#new(16) | 24,385,731 ops/sec | ±5.01% | 51 | ✓ |
| BrowserBuffer#readDoubleBE | 41,341 ops/sec | ±1.06% | 67 | |
| DataView#getFloat64 | 322,280 ops/sec | ±0.84% | 68 | ✓ |
| BrowserBuffer#readFloatBE | 46,141 ops/sec | ±1.06% | 65 | |
| DataView#getFloat32 | 337,025 ops/sec | ±0.43% | 69 | ✓ |
| BrowserBuffer#readUInt32LE | 151,551 ops/sec | ±1.02% | 66 | |
| DataView#getUint32 | 308,278 ops/sec | ±0.94% | 67 | ✓ |
| BrowserBuffer#slice | 197,365 ops/sec | ±0.95% | 66 | |
| Uint8Array#subarray | 9,558,024 ops/sec | ±3.08% | 58 | ✓ |
| BrowserBuffer#writeFloatBE | 17,518 ops/sec | ±1.03% | 63 | |
| DataView#setFloat32 | 319,751 ops/sec | ±0.48% | 68 | ✓ |
Node 0.11.14
| Method | Operations | Accuracy | Sampled | Fastest |
|---|---|---|---|---|
| BrowserBuffer#bracket-notation | 10,489,828 ops/sec | ±3.25% | 90 | |
| Uint8Array#bracket-notation | 10,534,884 ops/sec | ±0.81% | 92 | ✓ |
| NodeBuffer#bracket-notation | 10,389,910 ops/sec | ±0.97% | 87 | |
| BrowserBuffer#concat | 487,830 ops/sec | ±2.58% | 88 | |
| Uint8Array#concat | 1,814,327 ops/sec | ±1.28% | 88 | ✓ |
| NodeBuffer#concat | 1,636,523 ops/sec | ±1.88% | 73 | |
| BrowserBuffer#copy(16000) | 1,073,665 ops/sec | ±0.77% | 90 | |
| Uint8Array#copy(16000) | 1,348,517 ops/sec | ±0.84% | 89 | ✓ |
| NodeBuffer#copy(16000) | 1,289,533 ops/sec | ±0.82% | 93 | |
| BrowserBuffer#copy(16) | 12,782,706 ops/sec | ±0.74% | 85 | |
| Uint8Array#copy(16) | 14,180,427 ops/sec | ±0.93% | 92 | ✓ |
| NodeBuffer#copy(16) | 11,083,134 ops/sec | ±1.06% | 89 | |
| BrowserBuffer#new(16000) | 141,678 ops/sec | ±3.30% | 67 | |
| Uint8Array#new(16000) | 161,491 ops/sec | ±2.96% | 60 | |
| NodeBuffer#new(16000) | 292,699 ops/sec | ±3.20% | 55 | ✓ |
| BrowserBuffer#new(16) | 1,655,466 ops/sec | ±2.41% | 82 | |
| Uint8Array#new(16) | 14,399,926 ops/sec | ±0.91% | 94 | ✓ |
| NodeBuffer#new(16) | 3,894,696 ops/sec | ±0.88% | 92 | |
| BrowserBuffer#readDoubleBE | 109,582 ops/sec | ±0.75% | 93 | ✓ |
| DataView#getFloat64 | 91,235 ops/sec | ±0.81% | 90 | |
| NodeBuffer#readDoubleBE | 88,593 ops/sec | ±0.96% | 81 | |
| BrowserBuffer#readFloatBE | 139,854 ops/sec | ±1.03% | 85 | ✓ |
| DataView#getFloat32 | 98,744 ops/sec | ±0.80% | 89 | |
| NodeBuffer#readFloatBE | 92,769 ops/sec | ±0.94% | 93 | |
| BrowserBuffer#readUInt32LE | 710,861 ops/sec | ±0.82% | 92 | |
| DataView#getUint32 | 117,893 ops/sec | ±0.84% | 91 | |
| NodeBuffer#readUInt32LE | 851,412 ops/sec | ±0.72% | 93 | ✓ |
| BrowserBuffer#slice | 1,673,877 ops/sec | ±0.73% | 94 | |
| Uint8Array#subarray | 6,919,243 ops/sec | ±0.67% | 90 | ✓ |
| NodeBuffer#slice | 4,617,604 ops/sec | ±0.79% | 93 | |
| BrowserBuffer#writeFloatBE | 66,011 ops/sec | ±0.75% | 93 | |
| DataView#setFloat32 | 127,760 ops/sec | ±0.72% | 93 | ✓ |
| NodeBuffer#writeFloatBE | 103,352 ops/sec | ±0.83% | 93 |
iojs 1.8.1
| Method | Operations | Accuracy | Sampled | Fastest |
|---|---|---|---|---|
| BrowserBuffer#bracket-notation | 10,990,488 ops/sec | ±1.11% | 91 | |
| Uint8Array#bracket-notation | 11,268,757 ops/sec | ±0.65% | 97 | |
| NodeBuffer#bracket-notation | 11,353,260 ops/sec | ±0.83% | 94 | ✓ |
| BrowserBuffer#concat | 378,954 ops/sec | ±0.74% | 94 | |
| Uint8Array#concat | 1,358,288 ops/sec | ±0.97% | 87 | |
| NodeBuffer#concat | 1,934,050 ops/sec | ±1.11% | 78 | ✓ |
| BrowserBuffer#copy(16000) | 894,538 ops/sec | ±0.56% | 84 | |
| Uint8Array#copy(16000) | 1,442,656 ops/sec | ±0.71% | 96 | |
| NodeBuffer#copy(16000) | 1,457,898 ops/sec | ±0.53% | 92 | ✓ |
| BrowserBuffer#copy(16) | 12,870,457 ops/sec | ±0.67% | 95 | |
| Uint8Array#copy(16) | 16,643,989 ops/sec | ±0.61% | 93 | ✓ |
| NodeBuffer#copy(16) | 14,885,848 ops/sec | ±0.74% | 94 | |
| BrowserBuffer#new(16000) | 109,264 ops/sec | ±4.21% | 63 | |
| Uint8Array#new(16000) | 138,916 ops/sec | ±1.87% | 61 | |
| NodeBuffer#new(16000) | 281,449 ops/sec | ±3.58% | 51 | ✓ |
| BrowserBuffer#new(16) | 1,362,935 ops/sec | ±0.56% | 99 | |
| Uint8Array#new(16) | 6,193,090 ops/sec | ±0.64% | 95 | ✓ |
| NodeBuffer#new(16) | 4,745,425 ops/sec | ±1.56% | 90 | |
| BrowserBuffer#readDoubleBE | 118,127 ops/sec | ±0.59% | 93 | ✓ |
| DataView#getFloat64 | 107,332 ops/sec | ±0.65% | 91 | |
| NodeBuffer#readDoubleBE | 116,274 ops/sec | ±0.94% | 95 | |
| BrowserBuffer#readFloatBE | 150,326 ops/sec | ±0.58% | 95 | ✓ |
| DataView#getFloat32 | 110,541 ops/sec | ±0.57% | 98 | |
| NodeBuffer#readFloatBE | 121,599 ops/sec | ±0.60% | 87 | |
| BrowserBuffer#readUInt32LE | 814,147 ops/sec | ±0.62% | 93 | |
| DataView#getUint32 | 137,592 ops/sec | ±0.64% | 90 | |
| NodeBuffer#readUInt32LE | 931,650 ops/sec | ±0.71% | 96 | ✓ |
| BrowserBuffer#slice | 878,590 ops/sec | ±0.68% | 93 | |
| Uint8Array#subarray | 2,843,308 ops/sec | ±1.02% | 90 | |
| NodeBuffer#slice | 4,998,316 ops/sec | ±0.68% | 90 | ✓ |
| BrowserBuffer#writeFloatBE | 65,927 ops/sec | ±0.74% | 93 | |
| DataView#setFloat32 | 139,823 ops/sec | ±0.97% | 89 | ✓ |
| NodeBuffer#writeFloatBE | 135,763 ops/sec | ±0.65% | 96 | |
Testing the project
First, install the project:
npm install
Then, to run tests in Node.js, run:
npm run test-node
To test locally in a browser, you can run:
npm run test-browser-local
This will print out a URL that you can then open in a browser to run the tests, using Zuul.
To run automated browser tests using Saucelabs, ensure that your SAUCE_USERNAME and SAUCE_ACCESS_KEY environment variables are set, then run:
npm test
This is what's run in Travis, to check against various browsers. The list of browsers is kept in the .zuul.yml file.
JavaScript Standard Style
This module uses JavaScript Standard Style.
To test that the code conforms to the style, npm install and run:
./node_modules/.bin/standard
credit
This was originally forked from buffer-browserify.
license
MIT. Copyright (C) Feross Aboukhadijeh, and other contributors. Originally forked from an MIT-licensed module by Romain Beauxis.