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SharedBuffer.h

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00001 /*
00002  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions
00006  * are met:
00007  * 1. Redistributions of source code must retain the above copyright
00008  *    notice, this list of conditions and the following disclaimer.
00009  * 2. Redistributions in binary form must reproduce the above copyright
00010  *    notice, this list of conditions and the following disclaimer in the
00011  *    documentation and/or other materials provided with the distribution.
00012  *
00013  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
00014  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00015  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
00016  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
00017  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
00018  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
00019  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00020  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
00021  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00022  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
00023  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
00024  */
00025 #ifndef SharedBuffer_h
00026 #define SharedBuffer_h
00027 
00028 #include "PlatformString.h"
00029 #include <wtf/RefCounted.h>
00030 #include <wtf/Forward.h>
00031 #include <wtf/Vector.h>
00032 
00033 #if PLATFORM(CF)
00034 #include <wtf/RetainPtr.h>
00035 #endif
00036 
00037 #if PLATFORM(MAC)
00038 #ifdef __OBJC__
00039 @class NSData;
00040 #else
00041 class NSData;
00042 #endif
00043 
00044 #endif
00045 
00046 namespace WebCore {
00047 
00048 class SharedBuffer : public RefCounted<SharedBuffer> {
00049 public:
00050     static PassRefPtr<SharedBuffer> create() { return adoptRef(new SharedBuffer); }
00051     static PassRefPtr<SharedBuffer> create(const char* c, int i) { return adoptRef(new SharedBuffer(c, i)); }
00052     static PassRefPtr<SharedBuffer> create(const unsigned char* c, int i) { return adoptRef(new SharedBuffer(c, i)); }
00053 
00054     static PassRefPtr<SharedBuffer> createWithContentsOfFile(const String& filePath);
00055 
00056     static PassRefPtr<SharedBuffer> adoptVector(Vector<char>& vector);
00057     
00058 #if PLATFORM(MAC)
00059     NSData *createNSData();
00060     static PassRefPtr<SharedBuffer> wrapNSData(NSData *data);
00061 #endif
00062 #if PLATFORM(CF)
00063     CFDataRef createCFData();
00064 #endif
00065 
00066     const char* data() const;
00067     unsigned size() const;
00068     const Vector<char> &buffer() { return m_buffer; }
00069 
00070     bool isEmpty() const { return size() == 0; }
00071 
00072     void append(const char*, int);
00073     void clear();
00074     const char* platformData() const;
00075     unsigned platformDataSize() const;
00076 
00077     PassRefPtr<SharedBuffer> copy() const;
00078     
00079 private:
00080     SharedBuffer();
00081     SharedBuffer(const char*, int);
00082     SharedBuffer(const unsigned char*, int);
00083     
00084     void clearPlatformData();
00085     void maybeTransferPlatformData();
00086     bool hasPlatformData() const;
00087     
00088     Vector<char> m_buffer;
00089 #if PLATFORM(CF)
00090     SharedBuffer(CFDataRef);
00091     RetainPtr<CFDataRef> m_cfData;
00092 #endif
00093 };
00094     
00095 }
00096 
00097 #endif

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