1 /* $NetBSD: datafs.c,v 1.2 2008/04/28 20:23:18 martin Exp $ */
2
3 /*-
4 * Copyright (c) 2004 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by UCHIYAMA Yasushi.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <lib/libsa/stand.h>
33 #include <lib/libkern/libkern.h>
34
35 #include "local.h"
36
37 FS_DEF(data);
38
39 struct fs_ops datafs_ops = {
40 data_open, data_close, data_read, data_write, data_seek, data_stat
41 };
42
43 struct datafs {
44 uint8_t *ptr;
45 uint8_t *end;
46 uint8_t *start;
47 size_t size;
48 } __data;
49
50 void
data_attach(void * addr,size_t size)51 data_attach(void *addr, size_t size)
52 {
53
54 __data.start = addr;
55 __data.size = size;
56 }
57
58 int
data_open(const char * name,struct open_file * f)59 data_open(const char *name, struct open_file *f)
60 {
61
62 if (__data.size == 0) {
63 printf("no data\n");
64 return -1;
65 }
66
67 __data.ptr = __data.start;
68 __data.end = __data.ptr + __data.size;
69
70 return 0;
71 }
72
73 int
data_close(struct open_file * f)74 data_close(struct open_file *f)
75 {
76
77 return 0;
78 }
79
80 int
data_read(struct open_file * f,void * buf,size_t size,size_t * resid)81 data_read(struct open_file *f, void *buf, size_t size, size_t *resid)
82 {
83 uint8_t *b = buf;
84 size_t sz;
85
86 twiddle();
87 if (__data.ptr + size < __data.end) {
88 sz = size;
89 memcpy(b, __data.ptr, sz);
90 __data.ptr += sz;
91 } else {
92 sz = (size_t)(__data.end - __data.ptr);
93 while (__data.ptr < __data.end)
94 *b++ = *__data.ptr++;
95 }
96
97 if (resid)
98 *resid = size - sz;
99
100 return 0;
101 }
102
103 int
data_write(struct open_file * f,void * start,size_t size,size_t * resid)104 data_write(struct open_file *f, void *start, size_t size, size_t *resid)
105 {
106
107 return 0;
108 }
109
110 off_t
data_seek(struct open_file * f,off_t offset,int where)111 data_seek(struct open_file *f, off_t offset, int where)
112 {
113 uint8_t *p = 0;
114
115 switch (where) {
116 case SEEK_SET:
117 p = __data.start + offset;
118 break;
119 case SEEK_CUR:
120 p = __data.ptr + offset;
121 break;
122 case SEEK_END:
123 p = __data.end + offset;
124 break;
125 default:
126 return EINVAL;
127 }
128
129 if (p < __data.start || p >= __data.end) {
130 return EINVAL;
131 }
132
133 __data.ptr = p;
134
135 return (off_t)(p - __data.start);
136 }
137
138 int
data_stat(struct open_file * f,struct stat * stat)139 data_stat(struct open_file *f, struct stat *stat)
140 {
141
142 stat->st_size = __data.size;
143
144 return 0;
145 }
146