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punycode: Test for integer overflow

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isaacs 2011-07-06 13:12:21 -07:00
parent 2a848fa727
commit 8475e1527d
1 changed files with 2 additions and 1 deletions
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3
lib/punycode.js
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@ -28,6 +28,7 @@ var SKEW = 38;
var DAMP = 700; // initial bias scaler var DAMP = 700; // initial bias scaler
var INITIAL_N = 128; var INITIAL_N = 128;
var INITIAL_BIAS = 72; var INITIAL_BIAS = 72;
var MAX_INTEGER = Math.pow(2, 53);
function adapt_bias(delta, n_points, is_first) { function adapt_bias(delta, n_points, is_first) {
// scale back, then increase delta // scale back, then increase delta
@ -151,7 +152,7 @@ function encode(input) {
for (var i = 0; i < len; ++i) { for (var i = 0; i < len; ++i) {
var c = input[i]; var c = input[i];
if (c < n) { if (c < n) {
if (++delta == 0) { if (++delta == MAX_INTEGER) {
throw new Error('Delta overflow.'); throw new Error('Delta overflow.');
} }
} }