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#if ENABLE(BLOB)
34
35#include "BlobRegistryImpl.h"
36
37#include "BlobResourceHandle.h"
38#include "ResourceError.h"
39#include "ResourceHandle.h"
40#include "ResourceLoader.h"
41#include "ResourceRequest.h"
42#include "ResourceResponse.h"
43#include <wtf/MainThread.h>
44#include <wtf/StdLibExtras.h>
45
46namespace WebCore {
47
48#if !PLATFORM(CHROMIUM)
49BlobRegistry& blobRegistry()
50{
51    ASSERT(isMainThread());
52    DEFINE_STATIC_LOCAL(BlobRegistryImpl, instance, ());
53    return instance;
54}
55#endif
56
57bool BlobRegistryImpl::shouldLoadResource(const ResourceRequest& request) const
58{
59    // If the resource is not fetched using the GET method, bail out.
60    if (!equalIgnoringCase(request.httpMethod(), "GET"))
61        return false;
62
63    return true;
64}
65
66PassRefPtr<ResourceHandle> BlobRegistryImpl::createResourceHandle(const ResourceRequest& request, ResourceHandleClient* client)
67{
68    if (!shouldLoadResource(request))
69        return 0;
70
71    RefPtr<BlobResourceHandle> handle = BlobResourceHandle::create(m_blobs.get(request.url().string()), request, client);
72    handle->start();
73    return handle.release();
74}
75
76bool BlobRegistryImpl::loadResourceSynchronously(const ResourceRequest& request, ResourceError& error, ResourceResponse& response, Vector<char>& data)
77{
78    if (!shouldLoadResource(request))
79        return false;
80
81    BlobResourceHandle::loadResourceSynchronously(m_blobs.get(request.url().string()), request, error, response, data);
82    return true;
83}
84
85void BlobRegistryImpl::appendStorageItems(BlobStorageData* blobStorageData, const BlobDataItemList& items)
86{
87    for (BlobDataItemList::const_iterator iter = items.begin(); iter != items.end(); ++iter) {
88        if (iter->type == BlobDataItem::Data)
89            blobStorageData->m_data.appendData(iter->data, iter->offset, iter->length);
90        else {
91            ASSERT(iter->type == BlobDataItem::File);
92            blobStorageData->m_data.appendFile(iter->path, iter->offset, iter->length, iter->expectedModificationTime);
93        }
94    }
95}
96
97void BlobRegistryImpl::appendStorageItems(BlobStorageData* blobStorageData, const BlobDataItemList& items, long long offset, long long length)
98{
99    ASSERT(length != BlobDataItem::toEndOfFile);
100
101    BlobDataItemList::const_iterator iter = items.begin();
102    if (offset) {
103        for (; iter != items.end(); ++iter) {
104            if (offset >= iter->length)
105                offset -= iter->length;
106            else
107                break;
108        }
109    }
110
111    for (; iter != items.end() && length > 0; ++iter) {
112        long long currentLength = iter->length - offset;
113        long long newLength = currentLength > length ? length : currentLength;
114        if (iter->type == BlobDataItem::Data)
115            blobStorageData->m_data.appendData(iter->data, iter->offset + offset, newLength);
116        else {
117            ASSERT(iter->type == BlobDataItem::File);
118            blobStorageData->m_data.appendFile(iter->path, iter->offset + offset, newLength, iter->expectedModificationTime);
119        }
120        length -= newLength;
121        offset = 0;
122    }
123}
124
125void BlobRegistryImpl::registerBlobURL(const KURL& url, PassOwnPtr<BlobData> blobData)
126{
127    ASSERT(isMainThread());
128
129    RefPtr<BlobStorageData> blobStorageData = BlobStorageData::create(blobData->contentType(), blobData->contentDisposition());
130
131    // The blob data is stored in the "canonical" way. That is, it only contains a list of Data and File items.
132    // 1) The Data item is denoted by the raw data and the range.
133    // 2) The File item is denoted by the file path, the range and the expected modification time.
134    // All the Blob items in the passing blob data are resolved and expanded into a set of Data and File items.
135
136    for (BlobDataItemList::const_iterator iter = blobData->items().begin(); iter != blobData->items().end(); ++iter) {
137        switch (iter->type) {
138        case BlobDataItem::Data:
139            blobStorageData->m_data.appendData(iter->data, 0, iter->data->length());
140            break;
141        case BlobDataItem::File:
142            blobStorageData->m_data.appendFile(iter->path, iter->offset, iter->length, iter->expectedModificationTime);
143            break;
144        case BlobDataItem::Blob:
145            if (m_blobs.contains(iter->url.string()))
146                appendStorageItems(blobStorageData.get(), m_blobs.get(iter->url.string())->items(), iter->offset, iter->length);
147            break;
148        }
149    }
150
151    m_blobs.set(url.string(), blobStorageData);
152}
153
154void BlobRegistryImpl::registerBlobURL(const KURL& url, const KURL& srcURL)
155{
156    ASSERT(isMainThread());
157
158    RefPtr<BlobStorageData> src = m_blobs.get(srcURL.string());
159    ASSERT(src);
160    if (!src)
161        return;
162
163    m_blobs.set(url.string(), src);
164}
165
166void BlobRegistryImpl::unregisterBlobURL(const KURL& url)
167{
168    ASSERT(isMainThread());
169    m_blobs.remove(url.string());
170}
171
172PassRefPtr<BlobStorageData> BlobRegistryImpl::getBlobDataFromURL(const KURL& url) const
173{
174    ASSERT(isMainThread());
175    return m_blobs.get(url.string());
176}
177
178} // namespace WebCore
179
180#endif // ENABLE(BLOB)
181