cd9660_archimedes.c revision 332980 
1/* $NetBSD: cd9660_archimedes.c,v 1.1 2009/01/10 22:06:29 bjh21 Exp $ */
2
3/*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 1998, 2009 Ben Harris
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 *    derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31/*
32 * cd9660_archimedes.c - support for RISC OS "ARCHIMEDES" extension
33 *
34 * RISC OS CDFS looks for a special block at the end of the System Use
35 * Field for each file.  If present, this contains the RISC OS load
36 * and exec address (used to hold the file timestamp and type), the
37 * file attributes, and a flag indicating whether the first character
38 * of the filename should be replaced with '!' (since many special
39 * RISC OS filenames do).
40 */
41
42#include <sys/cdefs.h>
43__FBSDID("$FreeBSD: stable/11/usr.sbin/makefs/cd9660/cd9660_archimedes.c 332980 2018-04-25 01:35:06Z benno $");
44
45#include <sys/types.h>
46#include <assert.h>
47#include <stdint.h>
48#include <stdio.h>
49#include <stdlib.h>
50#include <string.h>
51
52#include "makefs.h"
53#include "cd9660.h"
54#include "cd9660_archimedes.h"
55
56/*
57 * Convert a Unix time_t (non-leap seconds since 1970-01-01) to a RISC
58 * OS time (non-leap(?) centiseconds since 1900-01-01(?)).
59 */
60
61static u_int64_t
62riscos_date(time_t unixtime)
63{
64	u_int64_t base;
65
66	base = 31536000ULL * 70 + 86400 * 17;
67	return (((u_int64_t)unixtime) + base)*100;
68}
69
70/*
71 * Add "ARCHIMEDES" metadata to a node if that seems appropriate.
72 *
73 * We touch regular files with names matching /,[0-9a-f]{3}$/ and
74 * directories matching /^!/.
75 */
76static void
77archimedes_convert_node(cd9660node *node)
78{
79	struct ISO_ARCHIMEDES *arc;
80	size_t len;
81	int type = -1;
82	uint64_t stamp;
83
84	if (node->su_tail_data != NULL)
85		/* Something else already has the tail. */
86		return;
87
88	len = strlen(node->node->name);
89	if (len < 1) return;
90
91	if (len >= 4 && node->node->name[len-4] == ',')
92		/* XXX should support ,xxx and ,lxa */
93		type = strtoul(node->node->name + len - 3, NULL, 16);
94	if (type == -1 && node->node->name[0] != '!')
95		return;
96	if (type == -1) type = 0;
97
98	assert(sizeof(struct ISO_ARCHIMEDES) == 32);
99	if ((arc = calloc(1, sizeof(struct ISO_ARCHIMEDES))) == NULL) {
100		CD9660_MEM_ALLOC_ERROR("archimedes_convert_node");
101		exit(1);
102	}
103
104	stamp = riscos_date(node->node->inode->st.st_mtime);
105
106	memcpy(arc->magic, "ARCHIMEDES", 10);
107	cd9660_731(0xfff00000 | (type << 8) | (stamp >> 32), arc->loadaddr);
108	cd9660_731(stamp & 0x00ffffffffULL, arc->execaddr);
109	arc->ro_attr = RO_ACCESS_UR | RO_ACCESS_OR;
110	arc->cdfs_attr = node->node->name[0] == '!' ? CDFS_PLING : 0;
111	node->su_tail_data = (void *)arc;
112	node->su_tail_size = sizeof(*arc);
113}
114
115/*
116 * Add "ARCHIMEDES" metadata to an entire tree recursively.
117 */
118void
119archimedes_convert_tree(cd9660node *node)
120{
121	cd9660node *cn;
122
123	assert(node != NULL);
124
125	archimedes_convert_node(node);
126
127		/* Recurse on children. */
128	TAILQ_FOREACH(cn, &node->cn_children, cn_next_child)
129		archimedes_convert_tree(cn);
130}
131