runtime/JSDataView.cpp

   1 /*
   2  * Copyright (C) 2013 Apple 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  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "JSDataView.h"
  28
  29 #include "ArrayBufferView.h"
  30 #include "DataView.h"
  31 #include "Error.h"
  32 #include "JSCInlines.h"
  33
  34 namespace JSC {
  35
  36 const ClassInfo JSDataView::s_info = {
  37     "DataView", &Base::s_info, 0, 0, CREATE_METHOD_TABLE(JSDataView)};
  38
  39 JSDataView::JSDataView(VM& vm, ConstructionContext& context, ArrayBuffer* buffer)
  40     : Base(vm, context)
  41     , m_buffer(buffer)
  42 {
  43 }
  44
  45 JSDataView* JSDataView::create(
  46     ExecState* exec, Structure* structure, PassRefPtr<ArrayBuffer> passedBuffer,
  47     unsigned byteOffset, unsigned byteLength)
  48 {
  49     RefPtr<ArrayBuffer> buffer = passedBuffer;
  50     if (!ArrayBufferView::verifySubRange<uint8_t>(buffer, byteOffset, byteLength)) {
  51         throwVMError(
  52             exec, createRangeError(exec, "Byte offset and length out of range of buffer"));
  53         return 0;
  54     }
  55     VM& vm = exec->vm();
  56     ConstructionContext context(
  57         structure, buffer, byteOffset, byteLength, ConstructionContext::DataView);
  58     ASSERT(context);
  59     JSDataView* result =
  60         new (NotNull, allocateCell<JSDataView>(vm.heap)) JSDataView(vm, context, buffer.get());
  61     result->finishCreation(vm);
  62     return result;
  63 }
  64
  65 JSDataView* JSDataView::createUninitialized(ExecState*, Structure*, unsigned)
  66 {
  67     UNREACHABLE_FOR_PLATFORM();
  68     return 0;
  69 }
  70
  71 JSDataView* JSDataView::create(ExecState*, Structure*, unsigned)
  72 {
  73     UNREACHABLE_FOR_PLATFORM();
  74     return 0;
  75 }
  76
  77 bool JSDataView::set(ExecState*, JSObject*, unsigned, unsigned)
  78 {
  79     UNREACHABLE_FOR_PLATFORM();
  80     return false;
  81 }
  82
  83 PassRefPtr<DataView> JSDataView::typedImpl()
  84 {
  85     return DataView::create(buffer(), byteOffset(), length());
  86 }
  87
  88 bool JSDataView::getOwnPropertySlot(
  89     JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
  90 {
  91     JSDataView* thisObject = jsCast<JSDataView*>(object);
  92     if (propertyName == exec->propertyNames().byteLength) {
  93         slot.setValue(thisObject, DontEnum | ReadOnly, jsNumber(thisObject->m_length));
  94         return true;
  95     }
  96
  97     return Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);
  98 }
  99
 100 ArrayBuffer* JSDataView::slowDownAndWasteMemory(JSArrayBufferView*)
 101 {
 102     UNREACHABLE_FOR_PLATFORM();
 103     return 0;
 104 }
 105
 106 PassRefPtr<ArrayBufferView> JSDataView::getTypedArrayImpl(JSArrayBufferView* object)
 107 {
 108     JSDataView* thisObject = jsCast<JSDataView*>(object);
 109     return thisObject->typedImpl();
 110 }
 111
 112 Structure* JSDataView::createStructure(
 113     VM& vm, JSGlobalObject* globalObject, JSValue prototype)
 114 {
 115     return Structure::create(
 116         vm, globalObject, prototype, TypeInfo(DataViewType, StructureFlags), info(),
 117         NonArray);
 118 }
 119
 120 } // namespace JSC
 121