Remove dead DataView IDL and C++ code

Source/core/html/canvas/DataView.cpp

-/*
- * 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:
- *
- * 1.  Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- * 2.  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.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS 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 APPLE OR ITS 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/html/canvas/DataView.h"
-
-#include "bindings/core/v8/ExceptionState.h"
-#include "core/dom/ExceptionCode.h"
-#include "platform/CheckedInt.h"
-#include "wtf/CPU.h"
-
-namespace {
-
-template<typename T>
-union Value {
-    T data;
-    char bytes[sizeof(T)];
-};
-
-}
-
-namespace blink {
-
-PassRefPtr<DataView> DataView::create(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned byteLength)
-{
-    RELEASE_ASSERT(byteOffset <= buffer->byteLength());
-    CheckedInt<uint32_t> checkedOffset(byteOffset);
-    CheckedInt<uint32_t> checkedLength(byteLength);
-    CheckedInt<uint32_t> checkedMax = checkedOffset + checkedLength;
-    RELEASE_ASSERT(checkedMax.isValid());
-    RELEASE_ASSERT(checkedMax.value() <= buffer->byteLength());
-    return adoptRef(new DataView(buffer, byteOffset, byteLength));
-}
-
-DataView::DataView(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned byteLength)
-    : ArrayBufferView(buffer, byteOffset)
-    , m_byteLength(byteLength)
-{
-}
-
-static bool needToFlipBytes(bool littleEndian)
-{
-#if CPU(BIG_ENDIAN)
-    return littleEndian;
-#else
-    return !littleEndian;
-#endif
-}
-
-inline void swapBytes(char* p, char* q)
-{
-    char temp = *p;
-    *p = *q;
-    *q = temp;
-}
-
-static void flipBytesFor16Bits(char* p)
-{
-    swapBytes(p, p + 1);
-}
-
-static void flipBytesFor32Bits(char* p)
-{
-    swapBytes(p, p + 3);
-    swapBytes(p + 1, p + 2);
-}
-
-static void flipBytesFor64Bits(char* p)
-{
-    swapBytes(p, p + 7);
-    swapBytes(p + 1, p + 6);
-    swapBytes(p + 2, p + 5);
-    swapBytes(p + 3, p + 4);
-}
-
-static void flipBytesIfNeeded(char* value, size_t size, bool littleEndian)
-{
-    if (!needToFlipBytes(littleEndian))
-        return;
-
-    switch (size) {
-    case 1:
-        // Nothing to do.
-        break;
-    case 2:
-        flipBytesFor16Bits(value);
-        break;
-    case 4:
-        flipBytesFor32Bits(value);
-        break;
-    case 8:
-        flipBytesFor64Bits(value);
-        break;
-    default:
-        ASSERT_NOT_REACHED();
-        break;
-    }
-}
-
-template<typename T>
-T DataView::getData(unsigned byteOffset, bool littleEndian, ExceptionState& exceptionState) const
-{
-    if (beyondRange<T>(byteOffset)) {
-        exceptionState.throwDOMException(IndexSizeError, "The provided offset (" + String::number(byteOffset) + ") is outside the allowed range.");
-        return 0;
-    }
-
-    // We do not want to load the data directly since it would cause a bus error on architectures that don't support unaligned loads.
-    Value<T> value;
-    memcpy(value.bytes, static_cast<const char*>(m_baseAddress) + byteOffset, sizeof(T));
-    flipBytesIfNeeded(value.bytes, sizeof(T), littleEndian);
-    return value.data;
-}
-
-template<typename T>
-void DataView::setData(unsigned byteOffset, T value, bool littleEndian, ExceptionState& exceptionState)
-{
-    if (beyondRange<T>(byteOffset)) {
-        exceptionState.throwDOMException(IndexSizeError, "The provided offset (" + String::number(byteOffset) + ") is outside the allowed range.");
-        return;
-    }
-
-    // We do not want to store the data directly since it would cause a bus error on architectures that don't support unaligned stores.
-    Value<T> tempValue;
-    tempValue.data = value;
-    flipBytesIfNeeded(tempValue.bytes, sizeof(T), littleEndian);
-    memcpy(static_cast<char*>(m_baseAddress) + byteOffset, tempValue.bytes, sizeof(T));
-}
-
-int16_t DataView::getInt16(unsigned byteOffset, bool littleEndian, ExceptionState& exceptionState)
-{
-    return getData<int16_t>(byteOffset, littleEndian, exceptionState);
-}
-
-uint16_t DataView::getUint16(unsigned byteOffset, bool littleEndian, ExceptionState& exceptionState)
-{
-    return getData<uint16_t>(byteOffset, littleEndian, exceptionState);
-}
-
-int32_t DataView::getInt32(unsigned byteOffset, bool littleEndian, ExceptionState& exceptionState)
-{
-    return getData<int32_t>(byteOffset, littleEndian, exceptionState);
-}
-
-uint32_t DataView::getUint32(unsigned byteOffset, bool littleEndian, ExceptionState& exceptionState)
-{
-    return getData<uint32_t>(byteOffset, littleEndian, exceptionState);
-}
-
-float DataView::getFloat32(unsigned byteOffset, bool littleEndian, ExceptionState& exceptionState)
-{
-    return getData<float>(byteOffset, littleEndian, exceptionState);
-}
-
-double DataView::getFloat64(unsigned byteOffset, bool littleEndian, ExceptionState& exceptionState)
-{
-    return getData<double>(byteOffset, littleEndian, exceptionState);
-}
-
-void DataView::setInt16(unsigned byteOffset, short value, bool littleEndian, ExceptionState& exceptionState)
-{
-    setData<int16_t>(byteOffset, value, littleEndian, exceptionState);
-}
-
-void DataView::setUint16(unsigned byteOffset, uint16_t value, bool littleEndian, ExceptionState& exceptionState)
-{
-    setData<uint16_t>(byteOffset, value, littleEndian, exceptionState);
-}
-
-void DataView::setInt32(unsigned byteOffset, int32_t value, bool littleEndian, ExceptionState& exceptionState)
-{
-    setData<int32_t>(byteOffset, value, littleEndian, exceptionState);
-}
-
-void DataView::setUint32(unsigned byteOffset, uint32_t value, bool littleEndian, ExceptionState& exceptionState)
-{
-    setData<uint32_t>(byteOffset, value, littleEndian, exceptionState);
-}
-
-void DataView::setFloat32(unsigned byteOffset, float value, bool littleEndian, ExceptionState& exceptionState)
-{
-    setData<float>(byteOffset, value, littleEndian, exceptionState);
-}
-
-void DataView::setFloat64(unsigned byteOffset, double value, bool littleEndian, ExceptionState& exceptionState)
-{
-    setData<double>(byteOffset, value, littleEndian, exceptionState);
-}
-
-void DataView::neuter()
-{
-    ArrayBufferView::neuter();
-    m_byteLength = 0;
-}
-
-} // namespace blink