2
* Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
3
* Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
5
* Redistribution and use in source and binary forms, with or without
6
* modification, are permitted provided that the following conditions
8
* 1. Redistributions of source code must retain the above copyright
9
* notice, this list of conditions and the following disclaimer.
10
* 2. Redistributions in binary form must reproduce the above copyright
11
* notice, this list of conditions and the following disclaimer in the
12
* documentation and/or other materials provided with the distribution.
14
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
15
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
18
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
#ifndef SharedBuffer_h
28
#define SharedBuffer_h
30
#include <wtf/Forward.h>
31
#include <wtf/OwnPtr.h>
32
#include <wtf/RefCounted.h>
33
#include <wtf/Vector.h>
34
#include <wtf/text/WTFString.h>
37
#include <wtf/RetainPtr.h>
40
#if PLATFORM(MAC) || (PLATFORM(QT) && USE(QTKIT))
46
class PurgeableBuffer;
48
class SharedBuffer : public RefCounted<SharedBuffer> {
50
static PassRefPtr<SharedBuffer> create() { return adoptRef(new SharedBuffer); }
51
static PassRefPtr<SharedBuffer> create(size_t size) { return adoptRef(new SharedBuffer(size)); }
52
static PassRefPtr<SharedBuffer> create(const char* c, int i) { return adoptRef(new SharedBuffer(c, i)); }
53
static PassRefPtr<SharedBuffer> create(const unsigned char* c, int i) { return adoptRef(new SharedBuffer(c, i)); }
55
static PassRefPtr<SharedBuffer> createWithContentsOfFile(const String& filePath);
57
static PassRefPtr<SharedBuffer> adoptVector(Vector<char>& vector);
59
// The buffer must be in non-purgeable state before adopted to a SharedBuffer.
60
// It will stay that way until released.
61
static PassRefPtr<SharedBuffer> adoptPurgeableBuffer(PassOwnPtr<PurgeableBuffer>);
65
#if PLATFORM(MAC) || (PLATFORM(QT) && USE(QTKIT))
66
NSData *createNSData();
67
static PassRefPtr<SharedBuffer> wrapNSData(NSData *data);
70
CFDataRef createCFData();
71
static PassRefPtr<SharedBuffer> wrapCFData(CFDataRef);
74
// Calling this function will force internal segmented buffers
75
// to be merged into a flat buffer. Use getSomeData() whenever possible
76
// for better performance.
77
const char* data() const;
79
unsigned size() const;
82
bool isEmpty() const { return !size(); }
84
void append(SharedBuffer*);
85
void append(const char*, unsigned);
86
void append(const Vector<char>&);
89
const char* platformData() const;
90
unsigned platformDataSize() const;
92
#if USE(NETWORK_CFDATA_ARRAY_CALLBACK)
93
void append(CFDataRef);
96
PassRefPtr<SharedBuffer> copy() const;
98
bool hasPurgeableBuffer() const { return m_purgeableBuffer.get(); }
100
// Ensure this buffer has no other clients before calling this.
101
PassOwnPtr<PurgeableBuffer> releasePurgeableBuffer();
103
// Return the number of consecutive bytes after "position". "data"
104
// points to the first byte.
105
// Return 0 when no more data left.
106
// When extracting all data with getSomeData(), the caller should
107
// repeat calling it until it returns 0.
109
// const char* segment;
111
// while (unsigned length = sharedBuffer->getSomeData(segment, pos)) {
112
// // Use the data. for example: decoder->decode(segment, length);
115
unsigned getSomeData(const char*& data, unsigned position = 0) const;
117
void reportMemoryUsage(MemoryObjectInfo*) const;
119
void createPurgeableBuffer() const;
123
explicit SharedBuffer(size_t);
124
SharedBuffer(const char*, int);
125
SharedBuffer(const unsigned char*, int);
127
// Calling this function will force internal segmented buffers
128
// to be merged into a flat buffer. Use getSomeData() whenever possible
129
// for better performance.
130
// As well, be aware that this method does *not* return any purgeable
131
// memory, which can be a source of bugs.
132
const Vector<char>& buffer() const;
134
void clearPlatformData();
135
void maybeTransferPlatformData();
136
bool hasPlatformData() const;
139
mutable Vector<char> m_buffer;
140
mutable Vector<char*> m_segments;
141
mutable OwnPtr<PurgeableBuffer> m_purgeableBuffer;
142
#if USE(NETWORK_CFDATA_ARRAY_CALLBACK)
143
mutable Vector<RetainPtr<CFDataRef> > m_dataArray;
144
void copyDataArrayAndClear(char *destination, unsigned bytesToCopy) const;
145
unsigned copySomeDataFromDataArray(const char*& someData, unsigned position) const;
146
const char *singleDataArrayBuffer() const;
149
explicit SharedBuffer(CFDataRef);
150
RetainPtr<CFDataRef> m_cfData;
154
PassRefPtr<SharedBuffer> utf8Buffer(const String&);
156
} // namespace WebCore
158
#endif // SharedBuffer_h