Exemple #1
0
/*
 * withBytes:
 *
 * Returns a new IOBufferMemoryDescriptor preloaded with bytes (copied).
 * The descriptor's length and capacity are set to the input buffer's size.
 */
IOBufferMemoryDescriptor *
IOBufferMemoryDescriptor::withBytes(const void * inBytes,
                                    vm_size_t    inLength,
                                    IODirection  inDirection,
                                    bool         inContiguous)
{
    IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;

    if (me && !me->initWithPhysicalMask(
               kernel_task, inDirection | kIOMemoryUnshared
                | (inContiguous ? kIOMemoryPhysicallyContiguous : 0),
               inLength, inLength, 0 ))
    {
	me->release();
	me = 0;
    }

    if (me)
    {
	// start out with no data
	me->setLength(0);

	if (!me->appendBytes(inBytes, inLength))
	{
	    me->release();
	    me = 0;
	}
    }
    return me;
}