1/* $NetBSD: cd9660_archimedes.c,v 1.1 2009/01/10 22:06:29 bjh21 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#include <sys/cdefs.h>
41__FBSDID("$FreeBSD: releng/11.0/usr.sbin/makefs/cd9660/cd9660_archimedes.c 214921 2010-11-07 16:05:04Z cognet $");
42
43#include <assert.h>
44#include <stdint.h>
45#include <stdio.h>
46#include <string.h>
47
48#include "makefs.h"
49#include "cd9660.h"
50#include "cd9660_archimedes.h"
51
52/*
53 * Convert a Unix time_t (non-leap seconds since 1970-01-01) to a RISC
54 * OS time (non-leap(?) centiseconds since 1900-01-01(?)).
55 */
56
57static u_int64_t
58riscos_date(time_t unixtime)
59{
60	u_int64_t base;
61
62	base = 31536000ULL * 70 + 86400 * 17;
63	return (((u_int64_t)unixtime) + base)*100;
64}
65
66/*
67 * Add "ARCHIMEDES" metadata to a node if that seems appropriate.
68 *
69 * We touch regular files with names matching /,[0-9a-f]{3}$/ and
70 * directories matching /^!/.
71 */
72static void
73archimedes_convert_node(cd9660node *node)
74{
75	struct ISO_ARCHIMEDES *arc;
76	size_t len;
77	int type = -1;
78	uint64_t stamp;
79
80	if (node->su_tail_data != NULL)
81		/* Something else already has the tail. */
82		return;
83
84	len = strlen(node->node->name);
85	if (len < 1) return;
86
87	if (len >= 4 && node->node->name[len-4] == ',')
88		/* XXX should support ,xxx and ,lxa */
89		type = strtoul(node->node->name + len - 3, NULL, 16);
90	if (type == -1 && node->node->name[0] != '!')
91		return;
92	if (type == -1) type = 0;
93
94	assert(sizeof(struct ISO_ARCHIMEDES) == 32);
95	if ((arc = calloc(1, sizeof(struct ISO_ARCHIMEDES))) == NULL) {
96		CD9660_MEM_ALLOC_ERROR("archimedes_convert_node");
97		exit(1);
98	}
99
100	stamp = riscos_date(node->node->inode->st.st_mtime);
101
102	memcpy(arc->magic, "ARCHIMEDES", 10);
103	cd9660_731(0xfff00000 | (type << 8) | (stamp >> 32), arc->loadaddr);
104	cd9660_731(stamp & 0x00ffffffffULL, arc->execaddr);
105	arc->ro_attr = RO_ACCESS_UR | RO_ACCESS_OR;
106	arc->cdfs_attr = node->node->name[0] == '!' ? CDFS_PLING : 0;
107	node->su_tail_data = (void *)arc;
108	node->su_tail_size = sizeof(*arc);
109}
110
111/*
112 * Add "ARCHIMEDES" metadata to an entire tree recursively.
113 */
114void
115archimedes_convert_tree(cd9660node *node)
116{
117	cd9660node *cn;
118
119	assert(node != NULL);
120
121	archimedes_convert_node(node);
122
123		/* Recurse on children. */
124	TAILQ_FOREACH(cn, &node->cn_children, cn_next_child)
125		archimedes_convert_tree(cn);
126}
127