89 lines
2.6 KiB
JavaScript
89 lines
2.6 KiB
JavaScript
import { Md5 } from './md5';
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// Hashes any blob
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export class Md5FileHasher {
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constructor(_callback, // Callback to return the result
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_async = true, // Async version is not always available in a web worker
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_partSize = 1048576) {
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this._callback = _callback;
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this._async = _async;
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this._partSize = _partSize;
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this._configureReader();
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}
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/**
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* Hash a blob of data in the worker
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* @param blob Data to hash
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*/
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hash(blob) {
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const self = this;
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self._blob = blob;
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// self._length = Math.ceil(blob.size / self._partSize);
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self._part = 0;
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self._md5 = new Md5();
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self._processPart();
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}
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_fail() {
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this._callback({
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success: false,
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result: 'data read failed'
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});
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}
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_hashData(e) {
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let self = this;
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self._md5.appendByteArray(new Uint8Array(e.target.result));
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if (self._part * self._partSize >= self._blob.size) {
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self._callback({
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success: true,
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result: self._md5.end()
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});
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}
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else {
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self._processPart();
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}
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}
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_processPart() {
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const self = this;
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let endbyte = 0;
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let current_part;
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self._part += 1;
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if (self._blob.size > self._partSize) { // If blob bigger then part_size we will slice it up
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endbyte = self._part * self._partSize;
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if (endbyte > self._blob.size) {
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endbyte = self._blob.size;
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}
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current_part = self._blob.slice((self._part - 1) * self._partSize, endbyte);
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}
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else {
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current_part = self._blob;
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}
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if (self._async) {
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self._reader.readAsArrayBuffer(current_part);
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}
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else {
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setTimeout(() => {
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try {
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self._hashData({
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target: {
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result: self._reader.readAsArrayBuffer(current_part)
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},
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});
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}
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catch (e) {
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self._fail();
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}
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}, 0);
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}
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}
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_configureReader() {
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const self = this;
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if (self._async) {
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self._reader = new FileReader();
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self._reader.onload = self._hashData.bind(self);
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self._reader.onerror = self._fail.bind(self);
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self._reader.onabort = self._fail.bind(self);
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}
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else {
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self._reader = new FileReaderSync();
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}
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}
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}
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//# sourceMappingURL=md5_file_hasher.js.map
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