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/**
* Copyright (c) 2013 ESHA Research
* Dual licensed under the MIT and GPL licenses:
* https://www.opensource.org/licenses/mit-license.php
* https://www.gnu.org/licenses/gpl.html
*
* store.remainingSpace();// returns remainingSpace value (if browser supports it)
* store.charsUsed();// returns length of all data when stringified
* store.charsLeft([true]);// tests how many more chars we can fit (crash threat!)
* store.charsTotal([true]);// charsUsed + charsLeft, duh.
*
* TODO: byte/string conversions
*
* Status: ALPHA - changing API *and* crash threats :)
*/
;(function(store, _) {
function put(area, s) {
try {
area.setItem("__test__", s);
return true;
} catch (e) {}
}
_.fn('remainingSpace', function() {
return this._area.remainingSpace;
});
_.fn('charsUsed', function() {
return _.stringify(this.getAll()).length - 2;
});
_.fn('charsLeft', function(test) {
if (this.isFake()){ return; }
if (arguments.length === 0) {
test = window.confirm('Calling store.charsLeft() may crash some browsers!');
}
if (test) {
var s = 's ', add = s;
// grow add for speed
while (put(store._area, s)) {
s += add;
if (add.length < 50000) {
add = s;
}
}
// shrink add for accuracy
while (add.length > 2) {
s = s.substring(0, s.length - (add.length/2));
while (put(store._area, s)) {
s += add;
}
add = add.substring(add.length/2);
}
_.remove(store._area, "__test__");
return s.length + 8;
}
});
_.fn('charsTotal', function(test) {
return store.charsUsed() + store.charsLeft(test);
});
})(window.store, window.store._);