StructuredClone.cpp [plain text]
#include "config.h"
#include "StructuredClone.h"
#include "JSDOMBinding.h"
#include "JSDOMExceptionHandling.h"
#include <JavaScriptCore/JSTypedArrays.h>
namespace WebCore {
using namespace JSC;
enum class CloneMode {
Full,
Partial,
};
static EncodedJSValue cloneArrayBufferImpl(JSGlobalObject* lexicalGlobalObject, CallFrame* callFrame, CloneMode mode)
{
VM& vm = lexicalGlobalObject->vm();
ASSERT(lexicalGlobalObject);
ASSERT(callFrame->argumentCount());
ASSERT(callFrame->lexicalGlobalObject(vm) == lexicalGlobalObject);
auto* buffer = toUnsharedArrayBuffer(vm, callFrame->uncheckedArgument(0));
if (!buffer) {
auto scope = DECLARE_THROW_SCOPE(vm);
throwDataCloneError(*lexicalGlobalObject, scope);
return { };
}
if (mode == CloneMode::Partial) {
ASSERT(callFrame->argumentCount() == 3);
int srcByteOffset = static_cast<int>(callFrame->uncheckedArgument(1).toNumber(lexicalGlobalObject));
int srcLength = static_cast<int>(callFrame->uncheckedArgument(2).toNumber(lexicalGlobalObject));
return JSValue::encode(JSArrayBuffer::create(lexicalGlobalObject->vm(), lexicalGlobalObject->arrayBufferStructure(ArrayBufferSharingMode::Default), buffer->slice(srcByteOffset, srcByteOffset + srcLength)));
}
return JSValue::encode(JSArrayBuffer::create(lexicalGlobalObject->vm(), lexicalGlobalObject->arrayBufferStructure(ArrayBufferSharingMode::Default), ArrayBuffer::tryCreate(buffer->data(), buffer->byteLength())));
}
EncodedJSValue JSC_HOST_CALL cloneArrayBuffer(JSGlobalObject* globalObject, CallFrame* callFrame)
{
return cloneArrayBufferImpl(globalObject, callFrame, CloneMode::Partial);
}
EncodedJSValue JSC_HOST_CALL structuredCloneArrayBuffer(JSGlobalObject* globalObject, CallFrame* callFrame)
{
return cloneArrayBufferImpl(globalObject, callFrame, CloneMode::Full);
}
EncodedJSValue JSC_HOST_CALL structuredCloneArrayBufferView(JSGlobalObject* globalObject, CallFrame* callFrame)
{
ASSERT(callFrame);
ASSERT(callFrame->argumentCount());
JSValue value = callFrame->uncheckedArgument(0);
VM& vm = globalObject->vm();
auto* bufferView = jsDynamicCast<JSArrayBufferView*>(vm, value);
ASSERT(bufferView);
auto* buffer = bufferView->unsharedBuffer();
if (!buffer) {
auto scope = DECLARE_THROW_SCOPE(vm);
throwDataCloneError(*globalObject, scope);
return { };
}
auto bufferClone = ArrayBuffer::tryCreate(buffer->data(), buffer->byteLength());
Structure* structure = bufferView->structure(vm);
if (jsDynamicCast<JSInt8Array*>(vm, value))
return JSValue::encode(JSInt8Array::create(globalObject, structure, WTFMove(bufferClone), bufferView->byteOffset(), bufferView->length()));
if (jsDynamicCast<JSInt16Array*>(vm, value))
return JSValue::encode(JSInt16Array::create(globalObject, structure, WTFMove(bufferClone), bufferView->byteOffset(), bufferView->length()));
if (jsDynamicCast<JSInt32Array*>(vm, value))
return JSValue::encode(JSInt32Array::create(globalObject, structure, WTFMove(bufferClone), bufferView->byteOffset(), bufferView->length()));
if (jsDynamicCast<JSUint8Array*>(vm, value))
return JSValue::encode(JSUint8Array::create(globalObject, structure, WTFMove(bufferClone), bufferView->byteOffset(), bufferView->length()));
if (jsDynamicCast<JSUint8ClampedArray*>(vm, value))
return JSValue::encode(JSUint8ClampedArray::create(globalObject, structure, WTFMove(bufferClone), bufferView->byteOffset(), bufferView->length()));
if (jsDynamicCast<JSUint16Array*>(vm, value))
return JSValue::encode(JSUint16Array::create(globalObject, structure, WTFMove(bufferClone), bufferView->byteOffset(), bufferView->length()));
if (jsDynamicCast<JSUint32Array*>(vm, value))
return JSValue::encode(JSUint32Array::create(globalObject, structure, WTFMove(bufferClone), bufferView->byteOffset(), bufferView->length()));
if (jsDynamicCast<JSFloat32Array*>(vm, value))
return JSValue::encode(JSFloat32Array::create(globalObject, structure, WTFMove(bufferClone), bufferView->byteOffset(), bufferView->length()));
if (jsDynamicCast<JSFloat64Array*>(vm, value))
return JSValue::encode(JSFloat64Array::create(globalObject, structure, WTFMove(bufferClone), bufferView->byteOffset(), bufferView->length()));
if (jsDynamicCast<JSDataView*>(vm, value))
return JSValue::encode(JSDataView::create(globalObject, structure, WTFMove(bufferClone), bufferView->byteOffset(), bufferView->length()));
ASSERT_NOT_REACHED();
return JSValue::encode(jsUndefined());
}
}