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// Copyright © 2006-2010 Travis Robinson. All rights reserved.
//
// website: http://sourceforge.net/projects/libusbdotnet
// e-mail: libusbdotnet@gmail.com
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. or
// visit www.gnu.org.
//
//
using System;
using System.Runtime.InteropServices;
using System.Threading;
using LibUsbDotNet.Main;
using MonoLibUsb;
using MonoLibUsb.Transfer;
namespace LibUsbDotNet.LudnMonoLibUsb.Internal
{
internal class MonoUsbTransferContext : UsbTransfer, IDisposable
{
private bool mOwnsTransfer;
private static readonly MonoUsbTransferDelegate mMonoUsbTransferCallbackDelegate = TransferCallback;
private GCHandle mCompleteEventHandle;
private MonoUsbTransfer mTransfer;
public MonoUsbTransferContext(UsbEndpointBase endpointBase)
: base(endpointBase)
{
}
#region IDisposable Members
public new void Dispose()
{
freeTransfer();
}
#endregion
private void allocTransfer(UsbEndpointBase endpointBase, bool ownsTransfer, int isoPacketSize, int count)
{
int numIsoPackets = 0;
if (isoPacketSize > 0)
numIsoPackets = count/isoPacketSize;
freeTransfer();
mTransfer = MonoUsbTransfer.Alloc(numIsoPackets);
mOwnsTransfer = ownsTransfer;
mTransfer.Type = endpointBase.Type;
mTransfer.Endpoint = endpointBase.EpNum;
mTransfer.NumIsoPackets = numIsoPackets;
if (!mCompleteEventHandle.IsAllocated)
mCompleteEventHandle = GCHandle.Alloc(mTransferCompleteEvent);
mTransfer.PtrUserData = GCHandle.ToIntPtr(mCompleteEventHandle);
if (numIsoPackets > 0)
mTransfer.SetIsoPacketLengths(isoPacketSize);
}
private void freeTransfer()
{
if (mTransfer.IsInvalid || mOwnsTransfer == false) return;
mTransferCancelEvent.Set();
mTransferCompleteEvent.WaitOne(200, UsbConstants.EXIT_CONTEXT);
mTransfer.Free();
if (mCompleteEventHandle.IsAllocated)
mCompleteEventHandle.Free();
}
/// <summary>
/// Fills the transfer with the data to <see cref="UsbTransfer.Submit"/>.
/// </summary>
/// <param name="buffer">The buffer.</param>
/// <param name="offset">The offset on the buffer where the transfer should read/write.</param>
/// <param name="count">The number of bytes to transfer.</param>
/// <param name="timeout">Time (milliseconds) to wait before the transfer times out.</param>
public override void Fill(IntPtr buffer, int offset, int count, int timeout)
{
allocTransfer(EndpointBase, true, 0, count);
base.Fill(buffer, offset, count, timeout);
mTransfer.Timeout = timeout;
mTransfer.PtrDeviceHandle = EndpointBase.Handle.DangerousGetHandle();
mTransfer.PtrCallbackFn = Marshal.GetFunctionPointerForDelegate(mMonoUsbTransferCallbackDelegate);
mTransfer.Type = EndpointBase.Type;
mTransfer.Endpoint = EndpointBase.EpNum;
mTransfer.ActualLength = 0;
mTransfer.Status = 0;
mTransfer.Flags = MonoUsbTransferFlags.None;
}
/// <summary>
/// Fills the transfer with the data to <see cref="UsbTransfer.Submit"/> an isochronous transfer.
/// </summary>
/// <param name="buffer">The buffer.</param>
/// <param name="offset">The offset on the buffer where the transfer should read/write.</param>
/// <param name="count">The number of bytes to transfer.</param>
/// <param name="timeout">Time (milliseconds) to wait before the transfer times out.</param>
/// <param name="isoPacketSize">Size of each isochronous packet.</param>
public override void Fill(IntPtr buffer, int offset, int count, int timeout, int isoPacketSize)
{
allocTransfer(EndpointBase, true, isoPacketSize, count);
base.Fill(buffer, offset, count, timeout, isoPacketSize);
mTransfer.Timeout = timeout;
mTransfer.PtrDeviceHandle = EndpointBase.Handle.DangerousGetHandle();
mTransfer.PtrCallbackFn = Marshal.GetFunctionPointerForDelegate(mMonoUsbTransferCallbackDelegate);
mTransfer.Type = EndpointBase.Type;
mTransfer.Endpoint = EndpointBase.EpNum;
mTransfer.ActualLength = 0;
mTransfer.Status = 0;
mTransfer.Flags = MonoUsbTransferFlags.None;
}
// Clean up the globally allocated memory.
~MonoUsbTransferContext() { Dispose(); }
/// <summary>
/// Submits the transfer.
/// </summary>
/// <remarks>
/// This functions submits the USB transfer and return immediately.
/// </remarks>
/// <returns>
/// <see cref="ErrorCode.Success"/> if the submit succeeds,
/// otherwise one of the other <see cref="ErrorCode"/> codes.
/// </returns>
public override ErrorCode Submit()
{
if (mTransferCancelEvent.WaitOne(0, false)) return ErrorCode.IoCancelled;
if (!mTransferCompleteEvent.WaitOne(0, UsbConstants.EXIT_CONTEXT)) return ErrorCode.ResourceBusy;
mTransfer.PtrBuffer = NextBufPtr;
mTransfer.Length = RequestCount;
mTransferCompleteEvent.Reset();
int ret = (int)mTransfer.Submit();
if (ret < 0)
{
mTransferCompleteEvent.Set();
UsbError usbErr = UsbError.Error(ErrorCode.MonoApiError, ret, "SubmitTransfer", EndpointBase);
return usbErr.ErrorCode;
}
return ErrorCode.Success;
}
/// <summary>
/// Wait for the transfer to complete, timeout, or get cancelled.
/// </summary>
/// <param name="transferredCount">The number of bytes transferred on <see cref="ErrorCode.Success"/>.</param>
/// <param name="cancel">Not used for libusb-1.0. Transfers are always cancelled on timeout or error.</param>
/// <returns><see cref="ErrorCode.Success"/> if the transfer completes successfully, otherwise one of the other <see cref="ErrorCode"/> codes.</returns>
public override ErrorCode Wait(out int transferredCount, bool cancel)
{
transferredCount = 0;
int ret = 0;
MonoUsbError monoError;
ErrorCode ec;
int iWait = WaitHandle.WaitAny(new WaitHandle[] {mTransferCompleteEvent, mTransferCancelEvent},
Timeout.Infinite,
UsbConstants.EXIT_CONTEXT);
switch (iWait)
{
case 0: // TransferCompleteEvent
if (mTransfer.Status == MonoUsbTansferStatus.TransferCompleted)
{
transferredCount = mTransfer.ActualLength;
return ErrorCode.Success;
}
string s;
monoError = MonoUsbApi.MonoLibUsbErrorFromTransferStatus(mTransfer.Status);
ec = MonoUsbApi.ErrorCodeFromLibUsbError((int)monoError, out s);
UsbError.Error(ErrorCode.MonoApiError, (int)monoError, "Wait:" + s, EndpointBase);
return ec;
case 1: // TransferCancelEvent
ret = (int)mTransfer.Cancel();
bool bTransferComplete = mTransferCompleteEvent.WaitOne(100, UsbConstants.EXIT_CONTEXT);
mTransferCompleteEvent.Set();
if (ret != 0 || !bTransferComplete)
{
ec = ret == 0 ? ErrorCode.CancelIoFailed : ErrorCode.MonoApiError;
UsbError.Error(ec, ret, String.Format("Wait:Unable to cancel transfer or the transfer did not return after it was cancelled. Cancelled:{0} TransferCompleted:{1}", (MonoUsbError)ret, bTransferComplete), EndpointBase);
return ec;
}
return ErrorCode.IoCancelled;
default: // Critical failure timeout
mTransfer.Cancel();
ec = ((EndpointBase.mEpNum & (byte)UsbCtrlFlags.Direction_In) > 0) ? ErrorCode.ReadFailed : ErrorCode.WriteFailed;
mTransferCompleteEvent.Set();
UsbError.Error(ec, ret, String.Format("Wait:Critical timeout failure! The transfer callback function was not called within the allotted time."), EndpointBase);
return ec;
}
}
private static void TransferCallback(MonoUsbTransfer pTransfer)
{
ManualResetEvent completeEvent = GCHandle.FromIntPtr(pTransfer.PtrUserData).Target as ManualResetEvent;
completeEvent.Set();
}
}
}
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