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adler32-umd is a pure-JavaScript UMD implementation of the Adler-32 checksum algorithm. This library utilizes the UMD pattern so that it works in Node.js, AMD, and browser globals.
For Node.js,
npm install git://github.com/hajimes/adler32-umd.gitFor client-side,
bower install git://github.com/hajimes/adler32-umd.gitFor Node.js,
var adler32 = require('adler32-umd');For AMD,
require.config({
paths: {
adler32: 'path/to/adler32-umd'
}
});
require(['adler32'], function(adler32) {
/* ... */
});In a brower,
<!-- The following snippet publishes a global function adler32 -->
<script src="path/to/adler32-umd/adler32-umd.min.js"></script>Returns the Adler-32 checksum value.
Usage:
var buffer = [0, 1, 2, 3, 4];
// simple
console.log(adler32(buffer));
// progressively
var checksum = adler32();
for (var i = 0; i < buffer.length; i++) {
checksum = adler32(buffer.slice(i, i + 1), checksum);
}
console.log(checksum);The first argument buffer can be any Array-like object
(e.g., built-in arrays, typed arrays in modern browers,
and Buffer in Node.js)
each of which element is an integer in the range of [0, 255].
If an element violates the range condition,
the behavior of this function is unspecified.
If buffer is undefined,
the result value is the same as one when an empty buffer is given.
The second argument is an optional checksum value to be updated, which is useful for calculating the checksum of a byte stream progressively.
Parameters
[buffer]: byte[]|Uint8Array|Buffer, - byte buffer
[checksum=1]: number, - previously calculated checksum
Returns
number, Adler-32 checksum value
- https://github.com/BlueJeansAndRain/adler32 - with support for rolling checksums
- https://github.com/SheetJS/js-adler32 - with support for standard and binary string inputs
- [RFC 1950: ZLIB Compressed Data Format Specification version 3.3] (http://tools.ietf.org/html/rfc1950)
- zlib
Copyright (c) 2014 Hajime Senuma [email protected] under the MIT License.