ts-md5
Version:
TypeScript MD5 implementation
96 lines • 3.15 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.Md5FileHasher = void 0;
var md5_1 = require("./md5");
// Hashes any blob
var Md5FileHasher = /** @class */ (function () {
function Md5FileHasher(_callback, // Callback to return the result
_async, // Async version is not always available in a web worker
_partSize) {
if (_async === void 0) { _async = true; }
if (_partSize === void 0) { _partSize = 1048576; }
this._callback = _callback;
this._async = _async;
this._partSize = _partSize;
this._configureReader();
}
/**
* Hash a blob of data in the worker
* @param blob Data to hash
*/
Md5FileHasher.prototype.hash = function (blob) {
var self = this;
self._blob = blob;
// self._length = Math.ceil(blob.size / self._partSize);
self._part = 0;
self._md5 = new md5_1.Md5();
self._processPart();
};
Md5FileHasher.prototype._fail = function () {
this._callback({
success: false,
result: 'data read failed'
});
};
Md5FileHasher.prototype._hashData = function (e) {
var self = this;
self._md5.appendByteArray(new Uint8Array(e.target.result));
if (self._part * self._partSize >= self._blob.size) {
self._callback({
success: true,
result: self._md5.end()
});
}
else {
self._processPart();
}
};
Md5FileHasher.prototype._processPart = function () {
var self = this;
var endbyte = 0;
var current_part;
self._part += 1;
if (self._blob.size > self._partSize) { // If blob bigger then part_size we will slice it up
endbyte = self._part * self._partSize;
if (endbyte > self._blob.size) {
endbyte = self._blob.size;
}
current_part = self._blob.slice((self._part - 1) * self._partSize, endbyte);
}
else {
current_part = self._blob;
}
if (self._async) {
self._reader.readAsArrayBuffer(current_part);
}
else {
setTimeout(function () {
try {
self._hashData({
target: {
result: self._reader.readAsArrayBuffer(current_part)
},
});
}
catch (e) {
self._fail();
}
}, 0);
}
};
Md5FileHasher.prototype._configureReader = function () {
var self = this;
if (self._async) {
self._reader = new FileReader();
self._reader.onload = self._hashData.bind(self);
self._reader.onerror = self._fail.bind(self);
self._reader.onabort = self._fail.bind(self);
}
else {
self._reader = new FileReaderSync();
}
};
return Md5FileHasher;
}());
exports.Md5FileHasher = Md5FileHasher;
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