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datafs.c revision 1.1.80.1
      1  1.1.80.1     yamt /*	$NetBSD: datafs.c,v 1.1.80.1 2008/05/16 02:22:20 yamt Exp $	*/
      2       1.1  tsutsui 
      3       1.1  tsutsui /*-
      4       1.1  tsutsui  * Copyright (c) 2004 The NetBSD Foundation, Inc.
      5       1.1  tsutsui  * All rights reserved.
      6       1.1  tsutsui  *
      7       1.1  tsutsui  * This code is derived from software contributed to The NetBSD Foundation
      8       1.1  tsutsui  * by UCHIYAMA Yasushi.
      9       1.1  tsutsui  *
     10       1.1  tsutsui  * Redistribution and use in source and binary forms, with or without
     11       1.1  tsutsui  * modification, are permitted provided that the following conditions
     12       1.1  tsutsui  * are met:
     13       1.1  tsutsui  * 1. Redistributions of source code must retain the above copyright
     14       1.1  tsutsui  *    notice, this list of conditions and the following disclaimer.
     15       1.1  tsutsui  * 2. Redistributions in binary form must reproduce the above copyright
     16       1.1  tsutsui  *    notice, this list of conditions and the following disclaimer in the
     17       1.1  tsutsui  *    documentation and/or other materials provided with the distribution.
     18       1.1  tsutsui  *
     19       1.1  tsutsui  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20       1.1  tsutsui  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21       1.1  tsutsui  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22       1.1  tsutsui  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23       1.1  tsutsui  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24       1.1  tsutsui  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25       1.1  tsutsui  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26       1.1  tsutsui  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27       1.1  tsutsui  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28       1.1  tsutsui  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29       1.1  tsutsui  * POSSIBILITY OF SUCH DAMAGE.
     30       1.1  tsutsui  */
     31       1.1  tsutsui 
     32       1.1  tsutsui #include <lib/libsa/stand.h>
     33       1.1  tsutsui #include <lib/libkern/libkern.h>
     34       1.1  tsutsui 
     35       1.1  tsutsui #include "local.h"
     36       1.1  tsutsui 
     37       1.1  tsutsui FS_DEF(data);
     38       1.1  tsutsui 
     39       1.1  tsutsui struct fs_ops datafs_ops = {
     40       1.1  tsutsui 	data_open, data_close, data_read, data_write, data_seek, data_stat
     41       1.1  tsutsui };
     42       1.1  tsutsui 
     43       1.1  tsutsui struct datafs {
     44       1.1  tsutsui 	uint8_t *ptr;
     45       1.1  tsutsui 	uint8_t *end;
     46       1.1  tsutsui 	uint8_t *start;
     47       1.1  tsutsui 	size_t size;
     48       1.1  tsutsui } __data;
     49       1.1  tsutsui 
     50       1.1  tsutsui void
     51       1.1  tsutsui data_attach(void *addr, size_t size)
     52       1.1  tsutsui {
     53       1.1  tsutsui 
     54       1.1  tsutsui 	__data.start = addr;
     55       1.1  tsutsui 	__data.size = size;
     56       1.1  tsutsui }
     57       1.1  tsutsui 
     58       1.1  tsutsui int
     59       1.1  tsutsui data_open(const char *name, struct open_file *f)
     60       1.1  tsutsui {
     61       1.1  tsutsui 
     62       1.1  tsutsui 	if (__data.size == 0) {
     63       1.1  tsutsui 		printf("no data\n");
     64       1.1  tsutsui 		return -1;
     65       1.1  tsutsui 	}
     66       1.1  tsutsui 
     67       1.1  tsutsui 	__data.ptr = __data.start;
     68       1.1  tsutsui 	__data.end = __data.ptr + __data.size;
     69       1.1  tsutsui 
     70       1.1  tsutsui 	return 0;
     71       1.1  tsutsui }
     72       1.1  tsutsui 
     73       1.1  tsutsui int
     74       1.1  tsutsui data_close(struct open_file *f)
     75       1.1  tsutsui {
     76       1.1  tsutsui 
     77       1.1  tsutsui 	return 0;
     78       1.1  tsutsui }
     79       1.1  tsutsui 
     80       1.1  tsutsui int
     81       1.1  tsutsui data_read(struct open_file *f, void *buf, size_t size, size_t *resid)
     82       1.1  tsutsui {
     83       1.1  tsutsui 	uint8_t *b = buf;
     84       1.1  tsutsui 	size_t sz;
     85       1.1  tsutsui 
     86       1.1  tsutsui 	twiddle();
     87       1.1  tsutsui 	if (__data.ptr + size < __data.end) {
     88       1.1  tsutsui 		sz = size;
     89       1.1  tsutsui 		memcpy(b, __data.ptr, sz);
     90       1.1  tsutsui 		__data.ptr += sz;
     91       1.1  tsutsui 	} else {
     92       1.1  tsutsui 		sz = (size_t)(__data.end - __data.ptr);
     93       1.1  tsutsui 		while (__data.ptr < __data.end)
     94       1.1  tsutsui 			*b++ = *__data.ptr++;
     95       1.1  tsutsui 	}
     96       1.1  tsutsui 
     97       1.1  tsutsui 	if (resid)
     98       1.1  tsutsui 		*resid = size - sz;
     99       1.1  tsutsui 
    100       1.1  tsutsui 	return 0;
    101       1.1  tsutsui }
    102       1.1  tsutsui 
    103       1.1  tsutsui int
    104       1.1  tsutsui data_write(struct open_file *f, void *start, size_t size, size_t *resid)
    105       1.1  tsutsui {
    106       1.1  tsutsui 
    107       1.1  tsutsui 	return 0;
    108       1.1  tsutsui }
    109       1.1  tsutsui 
    110       1.1  tsutsui off_t
    111       1.1  tsutsui data_seek(struct open_file *f, off_t offset, int where)
    112       1.1  tsutsui {
    113       1.1  tsutsui 	uint8_t *p = 0;
    114       1.1  tsutsui 
    115       1.1  tsutsui 	switch (where) {
    116       1.1  tsutsui 	case SEEK_SET:
    117       1.1  tsutsui 		p = __data.start + offset;
    118       1.1  tsutsui 		break;
    119       1.1  tsutsui 	case SEEK_CUR:
    120       1.1  tsutsui 		p = __data.ptr + offset;
    121       1.1  tsutsui 		break;
    122       1.1  tsutsui 	case SEEK_END:
    123       1.1  tsutsui 		p = __data.end + offset;
    124       1.1  tsutsui 		break;
    125       1.1  tsutsui 	default:
    126       1.1  tsutsui 		return EINVAL;
    127       1.1  tsutsui 	}
    128       1.1  tsutsui 
    129       1.1  tsutsui 	if (p < __data.start || p >= __data.end) {
    130       1.1  tsutsui 		return EINVAL;
    131       1.1  tsutsui 	}
    132       1.1  tsutsui 
    133       1.1  tsutsui 	__data.ptr = p;
    134       1.1  tsutsui 
    135       1.1  tsutsui 	return (off_t)(p - __data.start);
    136       1.1  tsutsui }
    137       1.1  tsutsui 
    138       1.1  tsutsui int
    139       1.1  tsutsui data_stat(struct open_file *f, struct stat *stat)
    140       1.1  tsutsui {
    141       1.1  tsutsui 
    142       1.1  tsutsui 	stat->st_size = __data.size;
    143       1.1  tsutsui 
    144       1.1  tsutsui 	return 0;
    145       1.1  tsutsui }
    146