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80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
/* Copyright (C) 2020 Monty Program Ab
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
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*/
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#pragma once
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#include <WinSock2.h>
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#include <windows.h>
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struct st_vio;
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struct win_aiosocket
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{
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/** OVERLAPPED is needed by all Windows AIO*/
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OVERLAPPED m_overlapped{};
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/** Handle to pipe, or socket */
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HANDLE m_handle{};
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/** Whether the m_handle refers to pipe*/
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bool m_is_pipe{};
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/* Read buffer handling */
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/** Pointer to buffer of size READ_BUFSIZ. Can be NULL.*/
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char *m_buf_ptr{};
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/** Offset to current buffer position*/
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size_t m_buf_off{};
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/** Size of valid data in the buffer*/
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size_t m_buf_datalen{};
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/* Vio handling */
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/** Pointer to original vio->vio_read/vio->has_data function */
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size_t (*m_orig_vio_read)(st_vio *, unsigned char *, size_t){};
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char (*m_orig_vio_has_data)(st_vio *){};
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/**
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Begins asynchronous reading from socket/pipe.
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On IO completion, pre-read some bytes into internal buffer
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*/
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DWORD begin_read();
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/**
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Update number of bytes returned, and IO error status
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Should be called right after IO is completed
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GetQueuedCompletionStatus() , or threadpool IO completion
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callback would return nbytes and the error.
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Sets the valid data length in the read buffer.
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*/
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void end_read(ULONG nbytes, DWORD err);
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/**
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Override VIO routines with ours, accounting for
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one-shot buffering.
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*/
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void init(st_vio *vio);
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/** Return number of unread bytes.*/
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size_t buffer_remaining();
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/* Frees the read buffer.*/
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~win_aiosocket();
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};
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/* Functions related to IO buffers caches.*/
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extern void init_win_aio_buffers(unsigned int n_buffers);
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extern void destroy_win_aio_buffers();
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