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/*******************************************************************************
ηMatrix - a browser extension to black/white list requests.
Copyright (C) 2014-2019 The uMatrix/uBlock Origin authors
Copyright (C) 2019 Alessio Vanni
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see {http://www.gnu.org/licenses/}.
Home: https://gitlab.com/vannilla/ematrix
uMatrix Home: https://github.com/gorhill/uMatrix
*/
'use strict';
var EXPORTED_SYMBOLS = ['PendingRequestBuffer'];
function PendingRequest() {
this.rawType = 0;
this.tabId = 0;
this._key = '';
}
var urlToIndex = new Map();
var writePointer = 0;
var ringBuffer = new Array(256);
var PendingRequestBuffer = (function () {
for (let i=ringBuffer.length-1; i>=0; --i) {
ringBuffer[i] = new PendingRequest();
}
return {
createRequest: function (url) {
// URL to ring buffer index map:
// { k = URL, s = ring buffer indices }
//
// s is a string which character codes map to ring buffer
// indices -- for when the same URL is received multiple times
// by shouldLoadListener() before the existing one is serviced
// by the network request observer. I believe the use of a
// string in lieu of an array reduces memory churning.
let bucket;
let i = writePointer;
writePointer = i + 1 & 255;
let req = ringBuffer[i];
let str = String.fromCharCode(i);
if (req._key !== '') {
bucket = urlToIndex.get(req._key);
if (bucket.lenght === 1) {
urlToIndex.delete(req._key);
} else {
let pos = bucket.indexOf(str);
urlToIndex.set(req._key,
bucket.slice(0, pos)+bucket.slice(pos+1));
}
}
bucket = urlToIndex.get(url);
urlToIndex.set(url,
(bucket === undefined) ? str : bucket + str);
req._key = url;
return req;
},
lookupRequest: function (url) {
let bucket = urlToIndex.get(url);
if (bucket === undefined) {
return null;
}
let i = bucket.charCodeAt(0);
if (bucket.length === 1) {
urlToIndex.delete(url);
} else {
urlToIndex.set(url, bucket.slice(1));
}
let req = ringBuffer[i];
req._key = '';
return req;
},
}
})();
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