116 lines
4.5 KiB
C++
Executable File
116 lines
4.5 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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#ifndef ANDROID_USB_API_ADB_LEGACY_IO_COMPLETION_H__
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#define ANDROID_USB_API_ADB_LEGACY_IO_COMPLETION_H__
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/** \file
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This file consists of declaration of class AdbLegacyIOCompletion that
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encapsulates a wrapper around OVERLAPPED Win32 structure returned from
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asynchronous I/O requests issued via legacy USB API.
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*/
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#include "adb_io_completion.h"
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#include "adb_legacy_endpoint_object.h"
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/** \brief Encapsulates a wrapper around OVERLAPPED Win32 structure returned
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from asynchronous I/O requests issued via legacy USB API.
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A handle to this object is returned to the caller of each successful
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asynchronous I/O request. Just like all other handles this handle
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must be closed after it's no longer needed.
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*/
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class AdbLegacyIOCompletion : public AdbIOCompletion {
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public:
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/** \brief Constructs the object.
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@param[in] parent_io_obj Parent legacy endpoint that created this
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instance.
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@param[in] expected_trans_size Number of bytes expected to be transferred
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with the I/O.
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@param[in] event_hndl Event handle that should be signaled when I/O
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completes. Can be NULL. If it's not NULL this handle will be
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used to initialize OVERLAPPED structure for this object.
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@param[in] is_write_ctl Flag indicating whether or not this completion
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object is created for ADB_IOCTL_BULK_WRITE I/O.
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*/
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AdbLegacyIOCompletion(AdbLegacyEndpointObject* parent_io_obj,
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ULONG expected_trans_size,
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HANDLE event_hndl,
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bool is_write_ctl);
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protected:
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/** \brief Destructs the object.
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We hide destructor in order to prevent ourseves from accidentaly allocating
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instances on the stack. If such attemp occur, compiler will error.
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*/
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virtual ~AdbLegacyIOCompletion();
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//
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// Abstract overrides
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//
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public:
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/** \brief Gets overlapped I/O result
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This method uses GetOverlappedResult to get results of the overlapped I/O
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operation.
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@param[out] ovl_data Buffer for the copy of this object's OVERLAPPED
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structure. Can be NULL.
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@param[out] bytes_transferred Pointer to a variable that receives the
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number of bytes that were actually transferred by a read or write
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operation. See SDK doc on GetOvelappedResult for more information.
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Unlike regular GetOvelappedResult call this parameter can be NULL.
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@param[in] wait If this parameter is true, the method does not return
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until the operation has been completed. If this parameter is false
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and the operation is still pending, the method returns false and
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the GetLastError function returns ERROR_IO_INCOMPLETE.
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@return true if I/O has been completed or false on failure or if request
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is not yet completed. If false is returned GetLastError() provides
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extended error information. If GetLastError returns
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ERROR_IO_INCOMPLETE it means that I/O is not yet completed.
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*/
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virtual bool GetOvelappedIoResult(LPOVERLAPPED ovl_data,
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ULONG* bytes_transferred,
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bool wait);
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public:
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/// Gets parent legacy endpoint.
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AdbLegacyEndpointObject* parent_legacy_io_object() const {
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return reinterpret_cast<AdbLegacyEndpointObject*>(parent_io_object());
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}
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/// Gets write IOCTL flag.
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bool is_write_ioctl() const {
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return is_write_ioctl_;
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}
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/// Gets address for ADB_IOCTL_BULK_WRITE output buffer.
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ULONG* transferred_bytes_ptr() {
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ATLASSERT(is_write_ioctl());
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return &transferred_bytes_;
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}
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protected:
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/// Recepient for number of transferred bytes in write IOCTL.
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ULONG transferred_bytes_;
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/// Write IOCTL flag.
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bool is_write_ioctl_;
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};
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#endif // ANDROID_USB_API_ADB_LEGACY_IO_COMPLETION_H__
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