1/* $NetBSD: cd9660_archimedes.c,v 1.3 2022/04/09 10:05:35 riastradh Exp $ */
2
3/*-
4 * Copyright (c) 1998, 2009 Ben Harris
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29/*
30 * cd9660_archimedes.c - support for RISC OS "ARCHIMEDES" extension
31 *
32 * RISC OS CDFS looks for a special block at the end of the System Use
33 * Field for each file. If present, this contains the RISC OS load
34 * and exec address (used to hold the file timestamp and type), the
35 * file attributes, and a flag indicating whether the first character
36 * of the filename should be replaced with '!' (since many special
37 * RISC OS filenames do).
38 */
39
40#if HAVE_NBTOOL_CONFIG_H
41#include "nbtool_config.h"
42#endif
43
44#include <sys/cdefs.h>
45#if defined(__RCSID) && !defined(__lint)
46__RCSID("$NetBSD: cd9660_archimedes.c,v 1.3 2022/04/09 10:05:35 riastradh Exp $");
47#endif /* !__lint */
48
49#include <assert.h>
50#include <stdint.h>
51#include <stdio.h>
52#include <string.h>
53#include <util.h>
54
55#include "makefs.h"
56#include "cd9660.h"
57#include "cd9660_archimedes.h"
58
59/*
60 * Convert a Unix time_t (non-leap seconds since 1970-01-01) to a RISC
61 * OS time (non-leap(?) centiseconds since 1900-01-01(?)).
62 */
63
64static u_int64_t
65riscos_date(time_t unixtime)
66{
67 u_int64_t base;
68
69 base = 31536000ULL * 70 + 86400 * 17;
70 return (((u_int64_t)unixtime) + base)*100;
71}
72
73/*
74 * Add "ARCHIMEDES" metadata to a node if that seems appropriate.
75 *
76 * We touch regular files with names matching /,[0-9a-f]{3}$/ and
77 * directories matching /^!/.
78 */
79static void
80archimedes_convert_node(cd9660node *node)
81{
82 struct ISO_ARCHIMEDES *arc;
83 size_t len;
84 int type = -1;
85 uint64_t stamp;
86
87 if (node->su_tail_data != NULL)
88 /* Something else already has the tail. */
89 return;
90
91 len = strlen(node->node->name);
92 if (len < 1) return;
93
94 if (len >= 4 && node->node->name[len-4] == ',')
95 /* XXX should support ,xxx and ,lxa */
96 type = strtoul(node->node->name + len - 3, NULL, 16);
97 if (type == -1 && node->node->name[0] != '!')
98 return;
99 if (type == -1) type = 0;
100
101 assert(sizeof(*arc) == 32);
102 arc = ecalloc(1, sizeof(*arc));
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}
