/*
 * Copyright (c) 2016 Daniel Boland <dboland@xs4all.nl>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of its 
 *    contributors may be used to endorse or promote products derived 
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS 
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 
 * THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <winbase.h>

/****************************************************/

BOOL 
sock_read(WIN_TASK *Task, WIN_VNODE *Node, LPSTR Buffer, DWORD Size, DWORD *Result)
{
	BOOL bResult = FALSE;
	ULONG ulResult = 0;

	while (!bResult){
		if (!pipe_FIONREAD(Node, &ulResult)){
			bResult = TRUE;		/* POSIX result for read() */
		}else if (ulResult){
			bResult = fifo_read(Node, Buffer, Size, Result);
			break;
		}else if (!sock_select(Node, INFINITE)){
			break;
		}else if (proc_poll(Task)){
			break;
		}
	}
	return(bResult);
}
BOOL 
sock_write(WIN_VNODE *Node, LPCSTR Buffer, DWORD Size, DWORD *Result)
{
	BOOL bResult = TRUE;
	DWORD dwResult = 0;
	OVERLAPPED ovl = {0, 0, 0, 0, Node->Event};
	DWORD dwSize = Size;

	/* Non-blocking file I/O can be achieved by limiting the number
	 * of bytes to write to the size of the pipe buffer, without
	 * having to put the pipe in PIPE_NOWAIT mode (rsync.exe).
	 */
	if (Node->Attribs & FILE_FLAG_OVERLAPPED){
		if (dwSize > WIN_PIPE_BUF){
			dwSize = WIN_PIPE_BUF;
		}
	}
	/* When writing to a nonblocking, byte-mode pipe handle with
	 * insufficient buffer space, WriteFile returns TRUE
	 * with *lpNumberOfBytesWritten < nNumberOfBytesToWrite. 
	 */
	if (!WriteFile(Node->Handle, Buffer, dwSize, &dwResult, &ovl)){
		return(FALSE);
	}else if (dwResult < Size){
		SetLastError(ERROR_MORE_DATA);
	}
	*Result = dwResult;
	return(bResult);
}