bool WebGLBuffer::associateBufferSubDataImpl(GC3Dintptr offset, ArrayBuffer* array, GC3Dintptr arrayByteOffset, GC3Dsizeiptr byteLength)
{
if (!array || offset < 0 || arrayByteOffset < 0 || byteLength < 0)
return false;
if (byteLength) {
CheckedInt<GC3Dintptr> checkedBufferOffset(offset);
CheckedInt<GC3Dintptr> checkedArrayOffset(arrayByteOffset);
CheckedInt<GC3Dsizeiptr> checkedLength(byteLength);
CheckedInt<GC3Dintptr> checkedArrayMax = checkedArrayOffset + checkedLength;
CheckedInt<GC3Dintptr> checkedBufferMax = checkedBufferOffset + checkedLength;
if (!checkedArrayMax.valid() || checkedArrayMax.value() > static_cast<int32_t>(array->byteLength()) || !checkedBufferMax.valid() || checkedBufferMax.value() > m_byteLength)
return false;
}
switch (m_target) {
case GraphicsContext3D::ELEMENT_ARRAY_BUFFER:
clearCachedMaxIndices();
if (byteLength) {
if (!m_elementArrayBuffer)
return false;
memcpy(static_cast<unsigned char*>(m_elementArrayBuffer->data()) + offset,
static_cast<unsigned char*>(array->data()) + arrayByteOffset,
byteLength);
}
return true;
case GraphicsContext3D::ARRAY_BUFFER:
return true;
default:
return false;
}
}
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));
}
PassRefPtr<DataView> DataView::create(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned byteLength)
{
if (byteOffset > buffer->byteLength())
return 0;
Checked<uint32_t, RecordOverflow> checkedOffset(byteOffset);
Checked<uint32_t, RecordOverflow> checkedLength(byteLength);
Checked<uint32_t, RecordOverflow> checkedMax = checkedOffset + checkedLength;
if (checkedMax.hasOverflowed() || checkedMax.unsafeGet() > buffer->byteLength())
return 0;
return adoptRef(new DataView(buffer, byteOffset, byteLength));
}
PassRefPtr<DataView> DataView::create(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned byteLength)
{
if (byteOffset > buffer->byteLength())
return 0;
CheckedInt<uint32_t> checkedOffset(byteOffset);
CheckedInt<uint32_t> checkedLength(byteLength);
CheckedInt<uint32_t> checkedMax = checkedOffset + checkedLength;
if (!checkedMax.isValid() || checkedMax.value() > buffer->byteLength())
return 0;
return adoptRef(new DataView(buffer, byteOffset, byteLength));
}
bool WebGLBuffer::associateBufferDataImpl(ArrayBuffer* array, GC3Dintptr byteOffset, GC3Dsizeiptr byteLength)
{
if (byteLength < 0 || byteOffset < 0)
return false;
if (array && byteLength) {
CheckedInt<GC3Dintptr> checkedOffset(byteOffset);
CheckedInt<GC3Dsizeiptr> checkedLength(byteLength);
CheckedInt<GC3Dintptr> checkedMax = checkedOffset + checkedLength;
if (!checkedMax.valid() || checkedMax.value() > static_cast<int32_t>(array->byteLength()))
return false;
}
switch (m_target) {
case GraphicsContext3D::ELEMENT_ARRAY_BUFFER:
m_byteLength = byteLength;
clearCachedMaxIndices();
if (byteLength) {
m_elementArrayBuffer = ArrayBuffer::create(byteLength, 1);
if (!m_elementArrayBuffer) {
m_byteLength = 0;
return false;
}
if (array) {
// We must always clone the incoming data because client-side
// modifications without calling bufferData or bufferSubData
// must never be able to change the validation results.
memcpy(static_cast<unsigned char*>(m_elementArrayBuffer->data()),
static_cast<unsigned char*>(array->data()) + byteOffset,
byteLength);
}
} else
m_elementArrayBuffer = 0;
return true;
case GraphicsContext3D::ARRAY_BUFFER:
m_byteLength = byteLength;
return true;
default:
return false;
}
}
