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);
}
/// <summary>
/// Parses all information of the configuration result.
/// </summary>
/// <param name="pdu">The EusbUrbCompletionPdu to be parsed.</param>
/// <returns>true indicates successful.</returns>
public bool ParseAll(EusbUrbCompletionPdu pdu)
{
if (pdu.OutputBuffer == null)
{
return(false);
}
ms = new MemoryStream(pdu.OutputBuffer);
USB_CONFIGURATION_DESCRIPTOR cd = UsbStructParser.Parse <USB_CONFIGURATION_DESCRIPTOR>(pdu);
ms.Seek(USB_CONFIGURATION_DESCRIPTOR.DefaultSize, SeekOrigin.Begin);
if (ms.Length != cd.wTotalLength)
{
return(false);
}
configDescriptor = pdu.OutputBuffer;
USB_INTERFACE_DESCRIPTOR interfaceDes = (USB_INTERFACE_DESCRIPTOR)GetNextDescriptor(UsbDescriptorTypes.USB_INTERFACE_DESCRIPTOR_TYPE);
while (null != interfaceDes)
{
TS_USBD_INTERFACE_INFORMATION interfaceInfo = new TS_USBD_INTERFACE_INFORMATION();
interfaceInfo.NumberOfPipesExpected = interfaceDes.bNumEndpoints;
interfaceInfo.InterfaceNumber = interfaceDes.bInterfaceNumber;
interfaceInfo.AlternateSetting = interfaceDes.bAlternateSetting;
// Padding can be set to any value and MUST be ignored upon receipt.
interfaceInfo.Padding = PaddingGenerator.GeneratePadding();
GeneratePipeInformation(interfaceDes, interfaceInfo);
interfaces.Add(interfaceInfo);
interfaceDes = (USB_INTERFACE_DESCRIPTOR)GetNextDescriptor(UsbDescriptorTypes.USB_INTERFACE_DESCRIPTOR_TYPE);
}
return(true);
}
private void GeneratePipeInformation(USB_INTERFACE_DESCRIPTOR interfaceDes, TS_USBD_INTERFACE_INFORMATION interfaceInfo)
{
uint pipeCount = interfaceDes.bNumEndpoints;
interfaceInfo.NumberOfPipes = pipeCount;
interfaceInfo.Infomations = new TS_USBD_PIPE_INFORMATION[pipeCount];
ushort lenExpectPipeInfo = 2 + 2 + 1 + 1 + 2 + 4;
interfaceInfo.Length = (ushort)(lenExpectPipeInfo + pipeCount * (2 + 2 + 4 + 4));
for (int i = 0; i < pipeCount; i++)
{
interfaceInfo.Infomations[i] = new TS_USBD_PIPE_INFORMATION();
// TODO:
// In Windows XP, Windows Server 2003 and later operating system, Alt settings for an interface or restrict the maximum packet size by setting
// MaximumPacketSize to some value less than or equal to the value of of wMaxPacketSize defined in device firmware for the current Alt settings.
interfaceInfo.Infomations[i].MaximumPacketSize = 0;
interfaceInfo.Infomations[i].Padding = PaddingGenerator.GeneratePadding();
// In Windows XP, Windows Server 2003 and later operating system, the MaximumTransferSize member of the USBD_PIPE_INFORMATION structure is obsolete.
interfaceInfo.Infomations[i].MaximumTransferSize = USBD_DEFAULT_MAXIMUM_TRANSFER_SIZE;
interfaceInfo.Infomations[i].PipeFlags = 0;
}
}