8267511c96
To support both, WinUsb and Legacy driver APIs we need to abstract classes that depend on driver API details and then implement two sets of the actual classes: one for WinUsb, and another for the Legacy drivers, so we can choose in runtime which objects should be instantiated, depending on what type of driver we have underneath this API.
88 lines
2.9 KiB
C++
Executable File
88 lines
2.9 KiB
C++
Executable File
/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/** \file
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This file consists of implementation of class AdbWinUsbIOCompletion that
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encapsulates a wrapper around OVERLAPPED Win32 structure returned from
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asynchronous I/O requests issued via WinUsb API.
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*/
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#include "stdafx.h"
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#include "adb_winusb_io_completion.h"
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AdbWinUsbIOCompletion::AdbWinUsbIOCompletion(
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AdbWinUsbEndpointObject* parent_io_obj,
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ULONG expected_trans_size,
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HANDLE event_hndl)
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: AdbIOCompletion(parent_io_obj, expected_trans_size, event_hndl) {
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}
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AdbWinUsbIOCompletion::~AdbWinUsbIOCompletion() {
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}
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bool AdbWinUsbIOCompletion::GetOvelappedIoResult(LPOVERLAPPED ovl_data,
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ULONG* bytes_transferred,
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bool wait) {
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if (NULL != bytes_transferred) {
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*bytes_transferred = 0;
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}
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if (!IsOpened()) {
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SetLastError(ERROR_INVALID_HANDLE);
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return false;
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}
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ULONG transfer;
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bool ret = WinUsb_GetOverlappedResult(
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parent_winusb_io_object()->winusb_handle(),
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overlapped(),
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&transfer,
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wait ? TRUE : FALSE) ? true : false;
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// TODO: This is bizzare but I've seen it happening
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// that GetOverlappedResult with wait set to true returns "prematurely",
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// with wrong transferred bytes value and GetLastError reporting
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// ERROR_IO_PENDING. So, lets give it an up to a 20 ms loop!
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ULONG error = GetLastError();
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if (wait && ret && (0 == transfer) && (0 != expected_transfer_size_) &&
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((ERROR_IO_INCOMPLETE == error) || (ERROR_IO_PENDING == error))) {
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for (int trying = 0; trying < 10; trying++) {
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Sleep(2);
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ret = WinUsb_GetOverlappedResult(
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parent_winusb_io_object()->winusb_handle(),
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overlapped(),
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&transfer,
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wait ? TRUE : FALSE) ? true : false;
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error = GetLastError();
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if (!ret || (0 != transfer) ||
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((ERROR_IO_INCOMPLETE != error) && (ERROR_IO_PENDING != error))) {
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break;
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}
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}
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}
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if (NULL != ovl_data) {
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CopyMemory(ovl_data, overlapped(), sizeof(OVERLAPPED));
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}
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if (NULL != bytes_transferred) {
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*bytes_transferred = transfer;
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}
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return ret;
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}
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