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      1 /*
      2  * Copyright (C) 2010 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 #include "config.h"
     32 
     33 #include "core/fileapi/BlobBuilder.h"
     34 
     35 #include "core/fileapi/Blob.h"
     36 #include "core/fileapi/File.h"
     37 #include "core/platform/text/LineEnding.h"
     38 #include "wtf/ArrayBuffer.h"
     39 #include "wtf/ArrayBufferView.h"
     40 #include "wtf/PassRefPtr.h"
     41 #include "wtf/Vector.h"
     42 #include "wtf/text/CString.h"
     43 #include "wtf/text/TextEncoding.h"
     44 
     45 namespace WebCore {
     46 
     47 BlobBuilder::BlobBuilder()
     48     : m_size(0)
     49 {
     50 }
     51 
     52 Vector<char>& BlobBuilder::getBuffer()
     53 {
     54     // If the last item is not a data item, create one. Otherwise, we simply append the new string to the last data item.
     55     if (m_items.isEmpty() || m_items[m_items.size() - 1].type != BlobDataItem::Data)
     56         m_items.append(BlobDataItem(RawData::create()));
     57 
     58     return *m_items[m_items.size() - 1].data->mutableData();
     59 }
     60 
     61 void BlobBuilder::append(const String& text, const String& endingType)
     62 {
     63     CString utf8Text = UTF8Encoding().normalizeAndEncode(text, WTF::EntitiesForUnencodables);
     64 
     65     Vector<char>& buffer = getBuffer();
     66     size_t oldSize = buffer.size();
     67 
     68     if (endingType == "native")
     69         normalizeLineEndingsToNative(utf8Text, buffer);
     70     else {
     71         ASSERT(endingType == "transparent");
     72         buffer.append(utf8Text.data(), utf8Text.length());
     73     }
     74     m_size += buffer.size() - oldSize;
     75 }
     76 
     77 void BlobBuilder::append(ArrayBuffer* arrayBuffer)
     78 {
     79     if (!arrayBuffer)
     80         return;
     81 
     82     appendBytesData(arrayBuffer->data(), arrayBuffer->byteLength());
     83 }
     84 
     85 void BlobBuilder::append(ArrayBufferView* arrayBufferView)
     86 {
     87     if (!arrayBufferView)
     88         return;
     89 
     90     appendBytesData(arrayBufferView->baseAddress(), arrayBufferView->byteLength());
     91 }
     92 
     93 void BlobBuilder::append(Blob* blob)
     94 {
     95     if (!blob)
     96         return;
     97     if (blob->isFile()) {
     98         File* file = toFile(blob);
     99         // If the blob is file that is not snapshoted, capture the snapshot now.
    100         // FIXME: This involves synchronous file operation. We need to figure out how to make it asynchronous.
    101         long long snapshotSize;
    102         double snapshotModificationTime;
    103         file->captureSnapshot(snapshotSize, snapshotModificationTime);
    104 
    105         m_size += snapshotSize;
    106         if (!file->fileSystemURL().isEmpty())
    107             m_items.append(BlobDataItem(file->fileSystemURL(), 0, snapshotSize, snapshotModificationTime));
    108         else
    109             m_items.append(BlobDataItem(file->path(), 0, snapshotSize, snapshotModificationTime));
    110     } else {
    111         long long blobSize = static_cast<long long>(blob->size());
    112         m_size += blobSize;
    113         m_items.append(BlobDataItem(blob->url(), 0, blobSize));
    114     }
    115 }
    116 
    117 void BlobBuilder::appendBytesData(const void* data, size_t length)
    118 {
    119     Vector<char>& buffer = getBuffer();
    120     size_t oldSize = buffer.size();
    121     buffer.append(static_cast<const char*>(data), length);
    122     m_size += buffer.size() - oldSize;
    123 }
    124 
    125 PassRefPtr<Blob> BlobBuilder::getBlob(const String& contentType)
    126 {
    127     OwnPtr<BlobData> blobData = BlobData::create();
    128     blobData->setContentType(contentType);
    129     blobData->swapItems(m_items);
    130 
    131     RefPtr<Blob> blob = Blob::create(blobData.release(), m_size);
    132 
    133     // After creating a blob from the current blob data, we do not need to keep the data around any more. Instead, we only
    134     // need to keep a reference to the URL of the blob just created.
    135     m_items.append(BlobDataItem(blob->url(), 0, m_size));
    136 
    137     return blob;
    138 }
    139 
    140 } // namespace WebCore
    141