file.c

wince host 和 target PCI驱动程序

/*
COPYRIGHT (c) 1996 by Philips Semiconductors

THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY ONLY BE USED AND COPIED IN 
ACCORDANCE WITH THE TERMS AND CONDITIONS OF SUCH A LICENSE AND WITH THE 
INCLUSION OF THE THIS COPY RIGHT NOTICE. THIS SOFTWARE OR ANY OTHER COPIES 
OF THIS SOFTWARE MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY OTHER
PERSON. THE OWNERSHIP AND TITLE OF THIS SOFTWARE IS NOT TRANSFERRED. 

THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT ANY PRIOR NOTICE
AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY Philips Semiconductor. 

PHILIPS ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF THIS SOFTWARE
ON PLATFORMS OTHER THAN THE ONE ON WHICH THIS SOFTWARE IS FURNISHED.
*/

/*
	Copyright (c) 1996 Philips Semiconductors - TriMedia. All rights reserved.

FILE	file.c

HISTORY
	#define TR Tilakraj Roy
	950201	TR Created

*/

#include "windows.h"
#include "stdcom.h"
#include "file.h"


FILE_VTBL FileVtbl = {
	fileCreate,
	fileDestroy,
	fileOpen,
	fileClose,
	fileRead,
	fileWrite,
	fileSeek
};

BOOL	fileCreate(INTERFACE_ID RefIID, PVOID *ppvObject)
{
	PFILE_OBJECT	this;

	if ( *ppvObject == NULL )
	{
		if ( ( this = malloc ( sizeof ( FILE_OBJECT ) ) ) == NULL )
		{	
			*ppvObject = NULL;
			return FALSE;
		}
		else
		{
			if ( QueryInterface ( RefIID, &this->pVtbl ) == FALSE )
			{
				free (this);	
				return FALSE;
			}
			*ppvObject = this;
			this->pvRef = this;
			this->pvMalloc = this;
			return TRUE;
		}
	}
	else // already allocated
	{
		this = (PFILE_OBJECT)*ppvObject;
		if ( QueryInterface ( RefIID, &this->pVtbl ) == FALSE )
		{
			return FALSE;
		}
		this->pvRef = this;
		this->pvMalloc = NULL;
		return TRUE;
	}
}

BOOL	fileDestroy(PVOID pObject )
{
	PFILE_OBJECT this = (PFILE_OBJECT)pObject;
	if ( this->pvRef != this )
		return FALSE;
	if ( this->pvMalloc )
		free ( this->pvMalloc );
	return TRUE;

}

BOOL	fileOpen ( PVOID pObject, PSTR szName, DWORD dwFlags, DWORD dwCreate )
{
	PFILE_OBJECT this = (PFILE_OBJECT)pObject;

	strcpy  ( this->szName, szName );
	if ( ( this->hFile =
	CreateFile( this->szName, GENERIC_READ | GENERIC_WRITE,
          0,                    // exclusive access
          NULL,                 // no security attrs
          dwCreate,
          dwFlags,
          NULL )) == (HANDLE) -1 )
	{
		return FALSE;
	}
	else
	{
		return TRUE;
	}

}

VOID	fileClose ( PVOID pObject )
{
	PFILE_OBJECT this = (PFILE_OBJECT)pObject;
	CloseHandle ( this->hFile );
}


BOOL	fileRead(PVOID pObject, PVOID pBuffer, DWORD dwLength, PDWORD pdwBytesRead )
{
	PFILE_OBJECT this = (PFILE_OBJECT)pObject;

	if ( ReadFile ( this->hFile, pBuffer, dwLength, pdwBytesRead, NULL ) == TRUE )
	{
		if ( *pdwBytesRead == 0  )
			return FALSE; // end of file.
	}
	return TRUE;

}

BOOL	fileWrite(PVOID pObject, PVOID pBuffer, DWORD dwLength, PDWORD pdwBytesWritten)
{
	PFILE_OBJECT this = (PFILE_OBJECT)pObject;
	return WriteFile ( this->hFile, pBuffer, dwLength, pdwBytesWritten, NULL );
}

DWORD fileSeek ( PVOID pObject, DWORD dwPosition, DWORD dwFrom )
{
	PFILE_OBJECT this = (PFILE_OBJECT)pObject;
	return SetFilePointer (  this->hFile, dwPosition, NULL, dwFrom );
}