» Javascript equivalent for PHP's base64_decode
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PHP to Javascript Project: php.js
This article is part of the 'Porting PHP to Javascript' Project, which aims to decrease the gap between developing for PHP & Javascript.
A lot of people are familiar with PHP's functions, and though Javascript functions are often quite similar, some functions may be missing or addressed differently. The Javascript implementations should be as compliant with the PHP versions as possible, a good indication is that the PHP function manual could also apply to the Javascript version.
Porting crucial PHP functions to Javascript can be fun & useful. Currently some PHP functions have been added, but readers are encouraged to contribute and improve functions by adding comments. Eventually the goal is to save all the functions in one php.js file and make it publicly available for your coding pleasure.
If you choose to contribute, let me know how you want to be credited in the function's comments. You may also want to subscribe to RSS so you receive updates whenever new functions are posted.
This is a Javascript version of the PHP function: base64_decode.
I have moved out PHP.JS to it's own site. For info & reactions on comments please goto phpjs.org
PHP base64_decode
Description
base64_decode - Decodes data encoded with MIME base64
string base64_decode( string data [, bool strict] )
Decodes a base64 encoded data.
Parameters
-
data
The decoded data.
-
strict
Returns FALSE if input contains space or some other separator.
Return Values
Returns the original data or FALSE on failure. The returned data may be binary.
See Also
Javascript base64_decode
Source
This is the main source of the Javascript version of PHP's base64_decode
function base64_decode( data ) { // http://kevin.vanzonneveld.net // + original by: Tyler Akins (http://rumkin.com) // + improved by: Thunder.m // + input by: Aman Gupta // + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net) // + bugfixed by: Onno Marsman // + bugfixed by: Pellentesque Malesuada // + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net) // + input by: Brett Zamir (http://brett-zamir.me) // + bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net) // - depends on: utf8_decode // * example 1: base64_decode('S2V2aW4gdmFuIFpvbm5ldmVsZA=='); // * returns 1: 'Kevin van Zonneveld' // mozilla has this native // - but breaks in 2.0.0.12! //if (typeof this.window['btoa'] == 'function') { // return btoa(data); //} var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; var o1, o2, o3, h1, h2, h3, h4, bits, i = 0, ac = 0, dec = "", tmp_arr = []; if (!data) { return data; } data += ''; do { // unpack four hexets into three octets using index points in b64 h1 = b64.indexOf(data.charAt(i++)); h2 = b64.indexOf(data.charAt(i++)); h3 = b64.indexOf(data.charAt(i++)); h4 = b64.indexOf(data.charAt(i++)); bits = h1<<18 | h2<<12 | h3<<6 | h4; o1 = bits>>16 & 0xff; o2 = bits>>8 & 0xff; o3 = bits & 0xff; if (h3 == 64) { tmp_arr[ac++] = String.fromCharCode(o1); } else if (h4 == 64) { tmp_arr[ac++] = String.fromCharCode(o1, o2); } else { tmp_arr[ac++] = String.fromCharCode(o1, o2, o3); } } while (i < data.length); dec = tmp_arr.join(''); dec = this.utf8_decode(dec); return dec; }
To run the Javascript base64_decode, you will also need the following dependencies:
Examples
Currently there is 1 example
Example 1
base64_decode('S2V2aW4gdmFuIFpvbm5ldmVsZA==');And that would return
'Kevin van Zonneveld'More about this Project
Download php.js
To easily include it in your code, every function currently available is stored in
Normal
- uncompressed source: php.js
- minified: php.min.js [recommended]
- compressed: php.packed.js
Namespaced What is 'namespaced?'
- uncompressed source: php.namespaced.js
- minified: php.namespaced.min.js
- compressed: php.namespaced.packed.js
To download use Right click, Save Link As
Generally the best way is to use a minified version and gzip it
Credits
Respect & awards go to everybody who has contributed in some way so far:
Your name here?
Contributing is as easy as adding a comment with better code, or code for a new function.
Any contribution leading to improvement will directly get your name & link here.
Coming Project features
Project features that we are currently working on:
- Done - Site. A place for php.js of it's own. See: phpjs.org.
- Done - Compile. Compile your own php.js version, with only the functions you need. Should generate a hash with which you can retrieve latest versions of your php.js combination. Done - Testsuite. A better test-suite that can be ran locally so developers can easily test before commiting. Also the testing itself should be more thorough.
- Done - Versioning. Individual functions are versioned, but the entire library should be versioned as well.
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#7. Kevin on 21 February 2009
#6. Pellentesque malesuada on 20 February 2009
The solution is to replace do/while method with simple while.
function base64_decode( data ) {
// http://kevin.vanzonneveld.net
... [more] // + original by: Tyler Akins (http://rumkin.com)
// + improved by: Thunder.m
// + input by: Aman Gupta
// + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// + bugfixed by: Onno Marsman
// - depends on: utf8_decode
// * example 1: base64_decode('S2V2aW4gdmFuIFpvbm5ldmVsZA==');
// * returns 1: 'Kevin van Zonneveld'
// mozilla has this native
// - but breaks in 2.0.0.12!
//if (typeof window['btoa'] == 'function') {
// return btoa(data);
//}
var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
var o1, o2, o3, h1, h2, h3, h4, bits, i = ac = 0, dec = "", tmp_arr = [];
data += '';
while (i < data.length) { // unpack four hexets into three octets using index points in b64
h1 = b64.indexOf(data.charAt(i++));
h2 = b64.indexOf(data.charAt(i++));
h3 = b64.indexOf(data.charAt(i++));
h4 = b64.indexOf(data.charAt(i++));
bits = h1<<18 | h2<<12 | h3<<6 | h4;
o1 = bits>>16 & 0xff;
o2 = bits>>8 & 0xff;
o3 = bits & 0xff;
if (h3 == 64) {
tmp_arr[ac++] = String.fromCharCode(o1);
} else if (h4 == 64) {
tmp_arr[ac++] = String.fromCharCode(o1, o2);
} else {
tmp_arr[ac++] = String.fromCharCode(o1, o2, o3);
}
}
dec = tmp_arr.join('');
dec = utf8_decode(dec);
return dec;
}
#5. Kevin on 08 May 2008
#4. Aman Gupta on 08 May 2008
In firefox, window.atob works for decoding as long as you don't pass in a large string. Over a certain size, it fails with an 'out of memory' error.
#3. Kevin on 25 April 2008
To make use of mozilla's native base64 functions.
#2. TXGruppi on 23 April 2008
The test is available in http://www.txgruppi.com/base64.html
If you can send me your e-mail, I would like to discuss some issues about things I liked in your site.
... [more]
* Address of my future site.
Any questions send me an email: txgruppi@gmail.com Translated by: Google Translator
#1. TXGruppi on 08 April 2008
There are the functions btoa and atob in JavaScript that make this conversion.
Any questions send me an email: txgruppi@gmail.com
Translated by: Google Translator