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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 #ifndef Blob_h
32 #define Blob_h
33 
34 #include "bindings/core/v8/ScriptWrappable.h"
35 #include "core/html/URLRegistry.h"
36 #include "platform/blob/BlobData.h"
37 #include "platform/heap/Handle.h"
38 #include "wtf/PassOwnPtr.h"
39 #include "wtf/PassRefPtr.h"
40 #include "wtf/RefCounted.h"
41 #include "wtf/text/WTFString.h"
42 
43 namespace blink {
44 
45 class ExceptionState;
46 class ExecutionContext;
47 
48 class Blob : public RefCountedWillBeGarbageCollectedFinalized<Blob>, public ScriptWrappable, public URLRegistrable {
49     DEFINE_WRAPPERTYPEINFO();
50 public:
create()51     static PassRefPtrWillBeRawPtr<Blob> create()
52     {
53         return adoptRefWillBeNoop(new Blob(BlobDataHandle::create()));
54     }
55 
create(PassRefPtr<BlobDataHandle> blobDataHandle)56     static PassRefPtrWillBeRawPtr<Blob> create(PassRefPtr<BlobDataHandle> blobDataHandle)
57     {
58         return adoptRefWillBeNoop(new Blob(blobDataHandle));
59     }
60 
61     virtual ~Blob();
62 
size()63     virtual unsigned long long size() const { return m_blobDataHandle->size(); }
64     virtual PassRefPtrWillBeRawPtr<Blob> slice(long long start, long long end, const String& contentType, ExceptionState&) const;
65 
66     // To allow ExceptionState to be passed in last, manually enumerate the optional argument overloads.
slice(ExceptionState & exceptionState)67     PassRefPtrWillBeRawPtr<Blob> slice(ExceptionState& exceptionState) const
68     {
69         return slice(0, std::numeric_limits<long long>::max(), String(), exceptionState);
70     }
slice(long long start,ExceptionState & exceptionState)71     PassRefPtrWillBeRawPtr<Blob> slice(long long start, ExceptionState& exceptionState) const
72     {
73         return slice(start, std::numeric_limits<long long>::max(), String(), exceptionState);
74     }
slice(long long start,long long end,ExceptionState & exceptionState)75     PassRefPtrWillBeRawPtr<Blob> slice(long long start, long long end, ExceptionState& exceptionState) const
76     {
77         return slice(start, end, String(), exceptionState);
78     }
79 
80     virtual void close(ExecutionContext*, ExceptionState&);
81 
type()82     String type() const { return m_blobDataHandle->type(); }
uuid()83     String uuid() const { return m_blobDataHandle->uuid(); }
blobDataHandle()84     PassRefPtr<BlobDataHandle> blobDataHandle() const { return m_blobDataHandle; }
85     // True for all File instances, including the user-built ones.
isFile()86     virtual bool isFile() const { return false; }
87     // Only true for File instances that are backed by platform files.
hasBackingFile()88     virtual bool hasBackingFile() const { return false; }
hasBeenClosed()89     bool hasBeenClosed() const { return m_hasBeenClosed; }
90 
91     // Used by the JavaScript Blob and File constructors.
92     virtual void appendTo(BlobData&) const;
93 
94     // URLRegistrable to support PublicURLs.
95     virtual URLRegistry& registry() const OVERRIDE FINAL;
96 
trace(Visitor *)97     void trace(Visitor*) { }
98 
99 protected:
100     explicit Blob(PassRefPtr<BlobDataHandle>);
101 
102     static void clampSliceOffsets(long long size, long long& start, long long& end);
103 private:
104     Blob();
105 
106     RefPtr<BlobDataHandle> m_blobDataHandle;
107     bool m_hasBeenClosed;
108 };
109 
110 } // namespace blink
111 
112 #endif // Blob_h
113