1/*
2 * Copyright (C) 2012 Apple 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
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "ShareableResource.h"
28
29#if ENABLE(SHAREABLE_RESOURCE)
30
31#include "ArgumentCoders.h"
32#include <WebCore/SharedBuffer.h>
33
34namespace WebKit {
35using namespace WebCore;
36
37ShareableResource::Handle::Handle()
38{
39}
40
41void ShareableResource::Handle::encode(IPC::Encoder& encoder) const
42{
43 encoder << m_handle;
44 encoder << m_offset;
45 encoder << m_size;
46}
47
48bool ShareableResource::Handle::decode(IPC::Decoder& decoder, Handle& handle)
49{
50 if (!decoder.decode(handle.m_handle))
51 return false;
52 if (!decoder.decode(handle.m_offset))
53 return false;
54 if (!decoder.decode(handle.m_size))
55 return false;
56 return true;
57}
58
59#if USE(CF)
60static void shareableResourceDeallocate(void *ptr, void *info)
61{
62 static_cast<ShareableResource*>(info)->deref(); // Balanced by ref() in createShareableResourceDeallocator()
63}
64
65static CFAllocatorRef createShareableResourceDeallocator(ShareableResource* resource)
66{
67 CFAllocatorContext context = { 0,
68 resource,
69 NULL, // retain
70 NULL, // release
71 NULL, // copyDescription
72 NULL, // allocate
73 NULL, // reallocate
74 shareableResourceDeallocate,
75 NULL, // preferredSize
76 };
77
78 return CFAllocatorCreate(kCFAllocatorDefault, &context);
79}
80#endif
81
82RefPtr<SharedBuffer> ShareableResource::wrapInSharedBuffer()
83{
84 ref(); // Balanced by deref when SharedBuffer is deallocated.
85
86#if USE(CF)
87 RetainPtr<CFAllocatorRef> deallocator = adoptCF(createShareableResourceDeallocator(this));
88 RetainPtr<CFDataRef> cfData = adoptCF(CFDataCreateWithBytesNoCopy(kCFAllocatorDefault, reinterpret_cast<const UInt8*>(data()), static_cast<CFIndex>(size()), deallocator.get()));
89 return SharedBuffer::create(cfData.get());
90#elif USE(SOUP)
91 return SharedBuffer::wrapSoupBuffer(soup_buffer_new_with_owner(data(), size(), this, [](void* data) { static_cast<ShareableResource*>(data)->deref(); }));
92#else
93 ASSERT_NOT_REACHED();
94 return nullptr;
95#endif
96}
97
98RefPtr<SharedBuffer> ShareableResource::Handle::tryWrapInSharedBuffer() const
99{
100 RefPtr<ShareableResource> resource = ShareableResource::map(*this);
101 if (!resource) {
102 LOG_ERROR("Failed to recreate ShareableResource from handle.");
103 return nullptr;
104 }
105
106 return resource->wrapInSharedBuffer();
107}
108
109Ref<ShareableResource> ShareableResource::create(Ref<SharedMemory>&& sharedMemory, unsigned offset, unsigned size)
110{
111 return adoptRef(*new ShareableResource(WTFMove(sharedMemory), offset, size));
112}
113
114RefPtr<ShareableResource> ShareableResource::map(const Handle& handle)
115{
116 auto sharedMemory = SharedMemory::map(handle.m_handle, SharedMemory::Protection::ReadOnly);
117 if (!sharedMemory)
118 return nullptr;
119
120 return create(sharedMemory.releaseNonNull(), handle.m_offset, handle.m_size);
121}
122
123ShareableResource::ShareableResource(Ref<SharedMemory>&& sharedMemory, unsigned offset, unsigned size)
124 : m_sharedMemory(WTFMove(sharedMemory))
125 , m_offset(offset)
126 , m_size(size)
127{
128 ASSERT(m_offset + m_size <= m_sharedMemory->size());
129
130 // FIXME (NetworkProcess): This data was received from another process. If it is bogus, should we assume that process is compromised and we should kill it?
131}
132
133ShareableResource::~ShareableResource()
134{
135}
136
137bool ShareableResource::createHandle(Handle& handle)
138{
139 if (!m_sharedMemory->createHandle(handle.m_handle, SharedMemory::Protection::ReadOnly))
140 return false;
141
142 handle.m_offset = m_offset;
143 handle.m_size = m_size;
144
145 return true;
146}
147
148const char* ShareableResource::data() const
149{
150 return static_cast<const char*>(m_sharedMemory->data()) + m_offset;
151}
152
153unsigned ShareableResource::size() const
154{
155 return m_size;
156}
157
158} // namespace WebKit
159
160#endif // ENABLE(SHAREABLE_RESOURCE)
161