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