/// <summary>
/// Unmarshal and validate the descriptor type from the marshaler buffer.
/// </summary>
/// <param name="marshaler">The marshaler containing raw data.</param>
/// <returns>true indicates that the field is decoded successfully and valid.</returns>
protected bool ReadDescriptorType(PduMarshaler marshaler)
{
bDescriptorType = UsbDescriptorTypes.UNKNOWN;
byte b = marshaler.ReadByte();
// TODO: don't hard-code.
if (b > 8 || b < 1)
{
return(false);
}
bDescriptorType = (UsbDescriptorTypes)b;
return(true);
}
private UsbDescriptorStructure GetNextDescriptor(UsbDescriptorTypes descriptorType)
{
byte[] temp = new byte[2];
UsbDescriptorStructure result = null;
while (ms.Position < ms.Length - 2)
{
if (2 != ms.Read(temp, 0, 2))
{
return(null);
}
UsbDescriptorStructure des = new UsbDescriptorStructure();
PduMarshaler.Unmarshal(temp, des);
if (des.bDescriptorType == descriptorType)
{
ms.Seek(-2, SeekOrigin.Current);
switch (des.bDescriptorType)
{
case UsbDescriptorTypes.USB_INTERFACE_DESCRIPTOR_TYPE:
result = new USB_INTERFACE_DESCRIPTOR();
if (ParseDescriptor(USB_INTERFACE_DESCRIPTOR.DefaultSize, result))
{
return(result);
}
break;
default:
throw new NotImplementedException();
//break;
}
}
else
{
ms.Seek(des.bLength - 1, SeekOrigin.Current);
}
}
return(result);
}
