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@ -61,6 +61,43 @@ define([
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return new Blob(chunks);
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};
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var concatBuffer = function (a, b) { // TODO make this not so ugly
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return new Uint8Array(slice(a).concat(slice(b)));
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};
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var fetchMetadata = function (src, cb) {
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var done = false;
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var CB = function (err, res) {
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if (done) { return; }
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done = true;
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cb(err, res);
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};
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var xhr = new XMLHttpRequest();
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xhr.open("GET", src, true);
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xhr.setRequestHeader('Range', 'bytes=0-1');
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xhr.responseType = 'arraybuffer';
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xhr.onload = function () {
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if (/^4/.test('' + this.status)) { return CB('XHR_ERROR'); }
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var res = new Uint8Array(xhr.response);
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var size = decodePrefix(res);
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var xhr2 = new XMLHttpRequest();
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xhr2.open("GET", src, true);
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xhr2.setRequestHeader('Range', 'bytes=2-' + (size + 2));
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xhr2.responseType = 'arraybuffer';
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xhr2.onload = function () {
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if (/^4/.test('' + this.status)) { return CB('XHR_ERROR'); }
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var res2 = new Uint8Array(xhr2.response);
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var all = concatBuffer(res, res2);
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CB(void 0, all);
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};
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xhr2.send(null);
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};
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xhr.send(null);
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};
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var decryptMetadata = function (u8, key) {
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var prefix = u8.subarray(0, 2);
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var metadataLength = decodePrefix(prefix);
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@ -74,6 +111,13 @@ define([
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catch (e) { return null; }
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};
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var fetchDecryptedMetadata = function (src, key, cb) {
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fetchMetadata(src, function (e, buffer) {
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if (e) { return cb(e); }
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cb(void 0, decryptMetadata(buffer, key));
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});
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};
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var decrypt = function (u8, key, done, progress) {
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var MAX = u8.length;
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var _progress = function (offset) {
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@ -212,5 +256,7 @@ define([
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joinChunks: joinChunks,
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computeEncryptedSize: computeEncryptedSize,
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decryptMetadata: decryptMetadata,
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fetchMetadata: fetchMetadata,
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fetchDecryptedMetadata: fetchDecryptedMetadata,
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};
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});
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