mirror of
https://github.com/musix-org/musix-oss
synced 2024-12-23 13:03:18 +00:00
42 lines
1.0 KiB
JavaScript
42 lines
1.0 KiB
JavaScript
/*jshint node:true */
|
|
'use strict';
|
|
var Buffer = require('buffer').Buffer; // browserify
|
|
var SlowBuffer = require('buffer').SlowBuffer;
|
|
|
|
module.exports = bufferEq;
|
|
|
|
function bufferEq(a, b) {
|
|
|
|
// shortcutting on type is necessary for correctness
|
|
if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
|
|
return false;
|
|
}
|
|
|
|
// buffer sizes should be well-known information, so despite this
|
|
// shortcutting, it doesn't leak any information about the *contents* of the
|
|
// buffers.
|
|
if (a.length !== b.length) {
|
|
return false;
|
|
}
|
|
|
|
var c = 0;
|
|
for (var i = 0; i < a.length; i++) {
|
|
/*jshint bitwise:false */
|
|
c |= a[i] ^ b[i]; // XOR
|
|
}
|
|
return c === 0;
|
|
}
|
|
|
|
bufferEq.install = function() {
|
|
Buffer.prototype.equal = SlowBuffer.prototype.equal = function equal(that) {
|
|
return bufferEq(this, that);
|
|
};
|
|
};
|
|
|
|
var origBufEqual = Buffer.prototype.equal;
|
|
var origSlowBufEqual = SlowBuffer.prototype.equal;
|
|
bufferEq.restore = function() {
|
|
Buffer.prototype.equal = origBufEqual;
|
|
SlowBuffer.prototype.equal = origSlowBufEqual;
|
|
};
|