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      1 /*
      2  * Copyright (C) 2012 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 /**
     32  * @interface
     33  */
     34 WebInspector.OutputStreamDelegate = function()
     35 {
     36 }
     37 
     38 WebInspector.OutputStreamDelegate.prototype = {
     39     onTransferStarted: function() { },
     40 
     41     onTransferFinished: function() { },
     42 
     43     /**
     44      * @param {!WebInspector.ChunkedReader} reader
     45      */
     46     onChunkTransferred: function(reader) { },
     47 
     48     /**
     49      * @param {!WebInspector.ChunkedReader} reader
     50      * @param {!Event} event
     51      */
     52     onError: function(reader, event) { },
     53 }
     54 
     55 /**
     56  * @interface
     57  */
     58 WebInspector.OutputStream = function()
     59 {
     60 }
     61 
     62 WebInspector.OutputStream.prototype = {
     63     /**
     64      * @param {string} data
     65      * @param {function(!WebInspector.OutputStream)=} callback
     66      */
     67     write: function(data, callback) { },
     68 
     69     close: function() { }
     70 }
     71 
     72 /**
     73  * @interface
     74  */
     75 WebInspector.ChunkedReader = function()
     76 {
     77 }
     78 
     79 WebInspector.ChunkedReader.prototype = {
     80     /**
     81      * @return {number}
     82      */
     83     fileSize: function() { },
     84 
     85     /**
     86      * @return {number}
     87      */
     88     loadedSize: function() { },
     89 
     90     /**
     91      * @return {string}
     92      */
     93     fileName: function() { },
     94 
     95     cancel: function() { }
     96 }
     97 
     98 /**
     99  * @constructor
    100  * @implements {WebInspector.ChunkedReader}
    101  * @param {!File} file
    102  * @param {number} chunkSize
    103  * @param {!WebInspector.OutputStreamDelegate} delegate
    104  */
    105 WebInspector.ChunkedFileReader = function(file, chunkSize, delegate)
    106 {
    107     this._file = file;
    108     this._fileSize = file.size;
    109     this._loadedSize = 0;
    110     this._chunkSize = chunkSize;
    111     this._delegate = delegate;
    112     this._isCanceled = false;
    113 }
    114 
    115 WebInspector.ChunkedFileReader.prototype = {
    116     /**
    117      * @param {!WebInspector.OutputStream} output
    118      */
    119     start: function(output)
    120     {
    121         this._output = output;
    122 
    123         this._reader = new FileReader();
    124         this._reader.onload = this._onChunkLoaded.bind(this);
    125         this._reader.onerror = this._delegate.onError.bind(this._delegate, this);
    126         this._delegate.onTransferStarted();
    127         this._loadChunk();
    128     },
    129 
    130     cancel: function()
    131     {
    132         this._isCanceled = true;
    133     },
    134 
    135     /**
    136      * @return {number}
    137      */
    138     loadedSize: function()
    139     {
    140         return this._loadedSize;
    141     },
    142 
    143     /**
    144      * @return {number}
    145      */
    146     fileSize: function()
    147     {
    148         return this._fileSize;
    149     },
    150 
    151     /**
    152      * @return {string}
    153      */
    154     fileName: function()
    155     {
    156         return this._file.name;
    157     },
    158 
    159     /**
    160      * @param {!Event} event
    161      */
    162     _onChunkLoaded: function(event)
    163     {
    164         if (this._isCanceled)
    165             return;
    166 
    167         if (event.target.readyState !== FileReader.DONE)
    168             return;
    169 
    170         var data = event.target.result;
    171         this._loadedSize += data.length;
    172 
    173         this._output.write(data);
    174         if (this._isCanceled)
    175             return;
    176         this._delegate.onChunkTransferred(this);
    177 
    178         if (this._loadedSize === this._fileSize) {
    179             this._file = null;
    180             this._reader = null;
    181             this._output.close();
    182             this._delegate.onTransferFinished();
    183             return;
    184         }
    185 
    186         this._loadChunk();
    187     },
    188 
    189     _loadChunk: function()
    190     {
    191         var chunkStart = this._loadedSize;
    192         var chunkEnd = Math.min(this._fileSize, chunkStart + this._chunkSize)
    193         var nextPart = this._file.slice(chunkStart, chunkEnd);
    194         this._reader.readAsText(nextPart);
    195     }
    196 }
    197 
    198 /**
    199  * @param {function(!File)} callback
    200  * @return {!Node}
    201  */
    202 WebInspector.createFileSelectorElement = function(callback) {
    203     var fileSelectorElement = document.createElement("input");
    204     fileSelectorElement.type = "file";
    205     fileSelectorElement.style.display = "none";
    206     fileSelectorElement.setAttribute("tabindex", -1);
    207     fileSelectorElement.onchange = onChange;
    208     function onChange(event)
    209     {
    210         callback(fileSelectorElement.files[0]);
    211     };
    212     return fileSelectorElement;
    213 }
    214 
    215 /**
    216  * @constructor
    217  * @implements {WebInspector.OutputStream}
    218  */
    219 WebInspector.FileOutputStream = function()
    220 {
    221 }
    222 
    223 WebInspector.FileOutputStream.prototype = {
    224     /**
    225      * @param {string} fileName
    226      * @param {function(boolean)} callback
    227      */
    228     open: function(fileName, callback)
    229     {
    230         this._closed = false;
    231         this._writeCallbacks = [];
    232         this._fileName = fileName;
    233 
    234         /**
    235          * @param {boolean} accepted
    236          * @this {WebInspector.FileOutputStream}
    237          */
    238         function callbackWrapper(accepted)
    239         {
    240             if (accepted)
    241                 WebInspector.fileManager.addEventListener(WebInspector.FileManager.EventTypes.AppendedToURL, this._onAppendDone, this);
    242             callback(accepted);
    243         }
    244         WebInspector.fileManager.save(this._fileName, "", true, callbackWrapper.bind(this));
    245     },
    246 
    247     /**
    248      * @param {string} data
    249      * @param {function(!WebInspector.OutputStream)=} callback
    250      */
    251     write: function(data, callback)
    252     {
    253         this._writeCallbacks.push(callback);
    254         WebInspector.fileManager.append(this._fileName, data);
    255     },
    256 
    257     close: function()
    258     {
    259         this._closed = true;
    260         if (this._writeCallbacks.length)
    261             return;
    262         WebInspector.fileManager.removeEventListener(WebInspector.FileManager.EventTypes.AppendedToURL, this._onAppendDone, this);
    263         WebInspector.fileManager.close(this._fileName);
    264     },
    265 
    266     /**
    267      * @param {!WebInspector.Event} event
    268      */
    269     _onAppendDone: function(event)
    270     {
    271         if (event.data !== this._fileName)
    272             return;
    273         var callback = this._writeCallbacks.shift();
    274         if (callback)
    275             callback(this);
    276         if (!this._writeCallbacks.length) {
    277             if (this._closed) {
    278                 WebInspector.fileManager.removeEventListener(WebInspector.FileManager.EventTypes.AppendedToURL, this._onAppendDone, this);
    279                 WebInspector.fileManager.close(this._fileName);
    280             }
    281         }
    282     }
    283 }
    284