Home | History | Annotate | Download | only in canvas 
      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
      6  * are met:
      7  *
      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.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     17  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     18  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     20  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     21  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef DataView_h
     27 #define DataView_h
     28 
     29 #include "ArrayBufferView.h"
     30 #include "ExceptionCode.h"
     31 #include <wtf/PassRefPtr.h>
     32 
     33 namespace WebCore {
     34 
     35 class DataView : public ArrayBufferView {
     36 public:
     37     static PassRefPtr<DataView> create(PassRefPtr<ArrayBuffer>, unsigned byteOffset, unsigned byteLength);
     38 
     39     virtual bool isDataView() const { return true; }
     40     virtual unsigned length() const { return m_byteLength; }
     41     virtual unsigned byteLength() const { return m_byteLength; }
     42     virtual PassRefPtr<ArrayBufferView> slice(int, int) const { return 0; }
     43 
     44     int8_t getInt8(unsigned byteOffset, ExceptionCode&);
     45     uint8_t getUint8(unsigned byteOffset, ExceptionCode&);
     46     int16_t getInt16(unsigned byteOffset, ExceptionCode& ec) { return getInt16(byteOffset, false, ec); }
     47     int16_t getInt16(unsigned byteOffset, bool littleEndian, ExceptionCode&);
     48     uint16_t getUint16(unsigned byteOffset, ExceptionCode& ec) { return getUint16(byteOffset, false, ec); }
     49     uint16_t getUint16(unsigned byteOffset, bool littleEndian, ExceptionCode&);
     50     int32_t getInt32(unsigned byteOffset, ExceptionCode& ec) { return getInt32(byteOffset, false, ec); }
     51     int32_t getInt32(unsigned byteOffset, bool littleEndian, ExceptionCode&);
     52     uint32_t getUint32(unsigned byteOffset, ExceptionCode& ec) { return getUint32(byteOffset, false, ec); }
     53     uint32_t getUint32(unsigned byteOffset, bool littleEndian, ExceptionCode&);
     54     float getFloat32(unsigned byteOffset, ExceptionCode& ec) { return getFloat32(byteOffset, false, ec); }
     55     float getFloat32(unsigned byteOffset, bool littleEndian, ExceptionCode&);
     56     double getFloat64(unsigned byteOffset, ExceptionCode& ec) { return getFloat64(byteOffset, false, ec); }
     57     double getFloat64(unsigned byteOffset, bool littleEndian, ExceptionCode&);
     58 
     59     void setInt8(unsigned byteOffset, int8_t value, ExceptionCode&);
     60     void setUint8(unsigned byteOffset, uint8_t value, ExceptionCode&);
     61     void setInt16(unsigned byteOffset, int16_t value, ExceptionCode& ec) { setInt16(byteOffset, value, false, ec); }
     62     void setInt16(unsigned byteOffset, int16_t value, bool littleEndian, ExceptionCode&);
     63     void setUint16(unsigned byteOffset, uint16_t value, ExceptionCode& ec) { setUint16(byteOffset, value, false, ec); }
     64     void setUint16(unsigned byteOffset, uint16_t value, bool littleEndian, ExceptionCode&);
     65     void setInt32(unsigned byteOffset, int32_t value, ExceptionCode& ec) { setInt32(byteOffset, value, false, ec); }
     66     void setInt32(unsigned byteOffset, int32_t value, bool littleEndian, ExceptionCode&);
     67     void setUint32(unsigned byteOffset, uint32_t value, ExceptionCode& ec) { setUint32(byteOffset, value, false, ec); }
     68     void setUint32(unsigned byteOffset, uint32_t value, bool littleEndian, ExceptionCode&);
     69     void setFloat32(unsigned byteOffset, float value, ExceptionCode& ec) { setFloat32(byteOffset, value, false, ec); }
     70     void setFloat32(unsigned byteOffset, float value, bool littleEndian, ExceptionCode&);
     71     void setFloat64(unsigned byteOffset, double value, ExceptionCode& ec) { setFloat64(byteOffset, value, false, ec); }
     72     void setFloat64(unsigned byteOffset, double value, bool littleEndian, ExceptionCode&);
     73 
     74 private:
     75     DataView(PassRefPtr<ArrayBuffer>, unsigned byteOffset, unsigned byteLength);
     76 
     77     template<typename T>
     78     inline bool beyondRange(unsigned byteOffset) const { return byteOffset >= m_byteLength || byteOffset + sizeof(T) > m_byteLength; }
     79 
     80     template<typename T>
     81     T getData(unsigned byteOffset, bool littleEndian, ExceptionCode&) const;
     82 
     83     template<typename T>
     84     void setData(unsigned byteOffset, T value, bool littleEndian, ExceptionCode&);
     85 
     86     unsigned m_byteLength;
     87 };
     88 
     89 
     90 } // namespace WebCore
     91 
     92 #endif // DataView_h
     93