146 lines
3.1 KiB
C
146 lines
3.1 KiB
C
/* $NetBSD: datafs.c,v 1.2 2008/04/28 20:23:18 martin Exp $ */
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/*-
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* Copyright (c) 2004 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by UCHIYAMA Yasushi.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <lib/libsa/stand.h>
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#include <lib/libkern/libkern.h>
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#include "local.h"
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FS_DEF(data);
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struct fs_ops datafs_ops = {
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data_open, data_close, data_read, data_write, data_seek, data_stat
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};
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struct datafs {
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uint8_t *ptr;
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uint8_t *end;
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uint8_t *start;
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size_t size;
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} __data;
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void
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data_attach(void *addr, size_t size)
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{
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__data.start = addr;
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__data.size = size;
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}
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int
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data_open(const char *name, struct open_file *f)
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{
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if (__data.size == 0) {
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printf("no data\n");
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return -1;
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}
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__data.ptr = __data.start;
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__data.end = __data.ptr + __data.size;
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return 0;
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}
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int
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data_close(struct open_file *f)
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{
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return 0;
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}
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int
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data_read(struct open_file *f, void *buf, size_t size, size_t *resid)
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{
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uint8_t *b = buf;
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size_t sz;
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twiddle();
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if (__data.ptr + size < __data.end) {
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sz = size;
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memcpy(b, __data.ptr, sz);
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__data.ptr += sz;
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} else {
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sz = (size_t)(__data.end - __data.ptr);
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while (__data.ptr < __data.end)
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*b++ = *__data.ptr++;
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}
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if (resid)
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*resid = size - sz;
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return 0;
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}
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int
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data_write(struct open_file *f, void *start, size_t size, size_t *resid)
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{
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return 0;
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}
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off_t
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data_seek(struct open_file *f, off_t offset, int where)
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{
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uint8_t *p = 0;
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switch (where) {
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case SEEK_SET:
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p = __data.start + offset;
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break;
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case SEEK_CUR:
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p = __data.ptr + offset;
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break;
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case SEEK_END:
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p = __data.end + offset;
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break;
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default:
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return EINVAL;
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}
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if (p < __data.start || p >= __data.end) {
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return EINVAL;
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}
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__data.ptr = p;
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return (off_t)(p - __data.start);
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}
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int
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data_stat(struct open_file *f, struct stat *stat)
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{
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stat->st_size = __data.size;
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return 0;
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}
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