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/* Copyright (C) 2020 Monty Program Ab
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; version 2 of the License.
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 02110-1335 USA
*/
#pragma once
#include <WinSock2.h>
#include <windows.h>
struct st_vio;
struct win_aiosocket
{
/** OVERLAPPED is needed by all Windows AIO*/
OVERLAPPED m_overlapped{};
/** Handle to pipe, or socket */
HANDLE m_handle{};
/** Whether the m_handle refers to pipe*/
bool m_is_pipe{};
/* Read buffer handling */
/** Pointer to buffer of size READ_BUFSIZ. Can be NULL.*/
char *m_buf_ptr{};
/** Offset to current buffer position*/
size_t m_buf_off{};
/** Size of valid data in the buffer*/
size_t m_buf_datalen{};
/* Vio handling */
/** Pointer to original vio->vio_read/vio->has_data function */
size_t (*m_orig_vio_read)(st_vio *, unsigned char *, size_t){};
char (*m_orig_vio_has_data)(st_vio *){};
/**
Begins asynchronnous reading from socket/pipe.
On IO completion, pre-read some bytes into internal buffer
*/
DWORD begin_read();
/**
Update number of bytes returned, and IO error status
Should be called right after IO is completed
GetQueuedCompletionStatus() , or threadpool IO completion
callback would return nbytes and the error.
Sets the valid data length in the read buffer.
*/
void end_read(ULONG nbytes, DWORD err);
/**
Override VIO routines with ours, accounting for
one-shot buffering.
*/
void init(st_vio *vio);
/** Return number of unread bytes.*/
size_t buffer_remaining();
/* Frees the read buffer.*/
~win_aiosocket();
};
/* Functions related to IO buffers caches.*/
extern void init_win_aio_buffers(unsigned int n_buffers);
extern void destroy_win_aio_buffers();
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