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/*
* Copyright (C) 2012 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
import * as Common from '../common/common.js'; // eslint-disable-line no-unused-vars
import * as Workspace from '../workspace/workspace.js';
/**
* @interface
*/
export class ChunkedReader {
/**
* @return {number}
*/
fileSize() {
}
/**
* @return {number}
*/
loadedSize() {
}
/**
* @return {string}
*/
fileName() {
}
cancel() {
}
/**
* @return {?FileError}
*/
error() {}
}
/**
* @implements {ChunkedReader}
* @unrestricted
*/
export class ChunkedFileReader {
/**
* @param {!Blob} blob
* @param {number} chunkSize
* @param {function(!ChunkedReader)=} chunkTransferredCallback
*/
constructor(blob, chunkSize, chunkTransferredCallback) {
this._file = blob;
this._fileSize = blob.size;
this._loadedSize = 0;
this._chunkSize = chunkSize;
this._chunkTransferredCallback = chunkTransferredCallback;
this._decoder = new TextDecoder();
this._isCanceled = false;
/** @type {?FileError} */
this._error = null;
}
/**
* @param {!Common.StringOutputStream.OutputStream} output
* @return {!Promise}
*/
read(output) {
if (this._chunkTransferredCallback) {
this._chunkTransferredCallback(this);
}
this._output = output;
this._reader = new FileReader();
this._reader.onload = this._onChunkLoaded.bind(this);
this._reader.onerror = this._onError.bind(this);
this._loadChunk();
return new Promise(resolve => this._transferFinished = resolve);
}
/**
* @override
*/
cancel() {
this._isCanceled = true;
}
/**
* @override
* @return {number}
*/
loadedSize() {
return this._loadedSize;
}
/**
* @override
* @return {number}
*/
fileSize() {
return this._fileSize;
}
/**
* @override
* @return {string}
*/
fileName() {
return this._file.name;
}
/**
* @override
* @return {?FileError}
*/
error() {
return this._error;
}
/**
* @param {!Event} event
*/
_onChunkLoaded(event) {
if (this._isCanceled) {
return;
}
if (event.target.readyState !== FileReader.DONE) {
return;
}
const buffer = this._reader.result;
this._loadedSize += buffer.byteLength;
const endOfFile = this._loadedSize === this._fileSize;
const decodedString = this._decoder.decode(buffer, {stream: !endOfFile});
this._output.write(decodedString);
if (this._isCanceled) {
return;
}
if (this._chunkTransferredCallback) {
this._chunkTransferredCallback(this);
}
if (endOfFile) {
this._file = null;
this._reader = null;
this._output.close();
this._transferFinished(!this._error);
return;
}
this._loadChunk();
}
_loadChunk() {
const chunkStart = this._loadedSize;
const chunkEnd = Math.min(this._fileSize, chunkStart + this._chunkSize);
const nextPart = this._file.slice(chunkStart, chunkEnd);
this._reader.readAsArrayBuffer(nextPart);
}
/**
* @param {!Event} event
*/
_onError(event) {
this._error = event.target.error;
this._transferFinished(false);
}
}
/**
* @implements {Common.StringOutputStream.OutputStream}
* @unrestricted
*/
export class FileOutputStream {
/**
* @param {string} fileName
* @return {!Promise}
*/
async open(fileName) {
this._closed = false;
/** @type {!Array} */
this._writeCallbacks = [];
this._fileName = fileName;
const saveResponse = await self.Workspace.fileManager.save(this._fileName, '', true);
if (saveResponse) {
self.Workspace.fileManager.addEventListener(Workspace.FileManager.Events.AppendedToURL, this._onAppendDone, this);
}
return !!saveResponse;
}
/**
* @override
* @param {string} data
* @return {!Promise}
*/
write(data) {
return new Promise(resolve => {
this._writeCallbacks.push(resolve);
self.Workspace.fileManager.append(this._fileName, data);
});
}
/**
* @override
*/
async close() {
this._closed = true;
if (this._writeCallbacks.length) {
return;
}
self.Workspace.fileManager.removeEventListener(
Workspace.FileManager.Events.AppendedToURL, this._onAppendDone, this);
self.Workspace.fileManager.close(this._fileName);
}
/**
* @param {!Common.EventTarget.EventTargetEvent} event
*/
_onAppendDone(event) {
if (event.data !== this._fileName) {
return;
}
this._writeCallbacks.shift()();
if (this._writeCallbacks.length) {
return;
}
if (!this._closed) {
return;
}
self.Workspace.fileManager.removeEventListener(
Workspace.FileManager.Events.AppendedToURL, this._onAppendDone, this);
self.Workspace.fileManager.close(this._fileName);
}
}
