fstream.c

SOSSE,最简单的实现smart卡的教学用程序 内有电路图

/*
	Simple Operating System for Smartcard Education
	Copyright (C) 2002  Matthias Bruestle <[e-mail]>

	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; either version 2 of the License, or
	(at your option) any later version.

	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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

/*! @file
	\brief File stream functions.

	$Id: fstream.c,v 1.11 2002/12/22 15:42:55 m Exp $
*/

#include <sw.h>
#include <fstream.h>
#include <hal.h>
#include <types.h>

bool fstream_read( S_FSTREAM *fs, iu8 *dst, iu8 len )
{
	if( !( fstream_test( fs, len ) &&
		hal_eeprom_read( dst, fs->start+fs->pos, len ) ) ) return FALSE;
	fs->pos+=len;
	return TRUE;
}

bool fstream_write( S_FSTREAM *fs, iu8 *src, iu8 len )
{
	if( !( fstream_test( fs, len ) &&
		hal_eeprom_write( fs->start+fs->pos, src, len ) ) ) return FALSE;
	fs->pos+=len;
	return TRUE;
}

bool fstream_test( S_FSTREAM *fs, iu16 len )
{
	if( fs->pos+len > fs->size ) {
		sw_set( SW_FILE_TO_SHORT );
		return FALSE;
	}
	return TRUE;
}