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
46namespace WebCore {
47
48WebKitBlobBuilder::WebKitBlobBuilder()
49    : m_size(0)
50{
51}
52
53Vector<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
62void 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
83void WebKitBlobBuilder::append(const String& text, ExceptionCode& ec)
84{
85    append(text, String(), ec);
86}
87
88#if ENABLE(BLOB)
89void 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
100void 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
121PassRefPtr<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