1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
/*
* Copyright (C) 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "core/fileapi/Blob.h"
#include "core/fileapi/File.h"
#include "platform/blob/BlobRegistry.h"
#include "platform/blob/BlobURL.h"
namespace WebCore {
namespace {
class BlobURLRegistry : public URLRegistry {
public:
virtual void registerURL(SecurityOrigin*, const KURL&, URLRegistrable*) OVERRIDE;
virtual void unregisterURL(const KURL&) OVERRIDE;
static URLRegistry& registry();
};
void BlobURLRegistry::registerURL(SecurityOrigin* origin, const KURL& publicURL, URLRegistrable* blob)
{
ASSERT(&blob->registry() == this);
BlobRegistry::registerPublicBlobURL(origin, publicURL, static_cast<Blob*>(blob)->blobDataHandle());
}
void BlobURLRegistry::unregisterURL(const KURL& publicURL)
{
BlobRegistry::revokePublicBlobURL(publicURL);
}
URLRegistry& BlobURLRegistry::registry()
{
DEFINE_STATIC_LOCAL(BlobURLRegistry, instance, ());
return instance;
}
} // namespace
Blob::Blob(PassRefPtr<BlobDataHandle> dataHandle)
: m_blobDataHandle(dataHandle)
{
ScriptWrappable::init(this);
}
Blob::~Blob()
{
}
PassRefPtr<Blob> Blob::slice(long long start, long long end, const String& contentType) const
{
// When we slice a file for the first time, we obtain a snapshot of the file by capturing its current size and modification time.
// The modification time will be used to verify if the file has been changed or not, when the underlying data are accessed.
long long size;
double modificationTime;
if (hasBackingFile()) {
// FIXME: This involves synchronous file operation. We need to figure out how to make it asynchronous.
toFile(this)->captureSnapshot(size, modificationTime);
} else {
size = this->size();
ASSERT(size != -1);
}
// Convert the negative value that is used to select from the end.
if (start < 0)
start = start + size;
if (end < 0)
end = end + size;
// Clamp the range if it exceeds the size limit.
if (start < 0)
start = 0;
if (end < 0)
end = 0;
if (start >= size) {
start = 0;
end = 0;
} else if (end < start)
end = start;
else if (end > size)
end = size;
long long length = end - start;
OwnPtr<BlobData> blobData = BlobData::create();
blobData->setContentType(contentType);
if (hasBackingFile()) {
if (!toFile(this)->fileSystemURL().isEmpty())
blobData->appendFileSystemURL(toFile(this)->fileSystemURL(), start, length, modificationTime);
else
blobData->appendFile(toFile(this)->path(), start, length, modificationTime);
} else {
blobData->appendBlob(m_blobDataHandle, start, length);
}
return Blob::create(BlobDataHandle::create(blobData.release(), length));
}
URLRegistry& Blob::registry() const
{
return BlobURLRegistry::registry();
}
} // namespace WebCore
|
