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 51 data_attach(void *addr, size_t size) 52 { 53 54 __data.start = addr; 55 __data.size = size; 56 } 57 58 int 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 74 data_close(struct open_file *f) 75 { 76 77 return 0; 78 } 79 80 int 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 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 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 139 data_stat(struct open_file *f, struct stat *stat) 140 { 141 142 stat->st_size = __data.size; 143 144 return 0; 145 } 146