text: /* $NetBSD: cd9660_archimedes.c,v 1.1 2009/01/10 22:06:29 bjh21 Exp $ */
  
  /*-
   * Copyright (c) 1998, 2009 Ben Harris
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   * 
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  /*
   * cd9660_archimedes.c - support for RISC OS "ARCHIMEDES" extension
   *
   * RISC OS CDFS looks for a special block at the end of the System Use
   * Field for each file.  If present, this contains the RISC OS load
   * and exec address (used to hold the file timestamp and type), the
   * file attributes, and a flag indicating whether the first character
   * of the filename should be replaced with '!' (since many special
   * RISC OS filenames do).
   */
  
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD$");
  
  #include <assert.h>
  #include <stdint.h>
  #include <stdio.h>
  #include <string.h>
  
  #include "makefs.h"
  #include "cd9660.h"
  #include "cd9660_archimedes.h"
  
  /*
   * Convert a Unix time_t (non-leap seconds since 1970-01-01) to a RISC
   * OS time (non-leap(?) centiseconds since 1900-01-01(?)).
   */
  
  static u_int64_t
  riscos_date(time_t unixtime)
  {
  	u_int64_t base;
  
  	base = 31536000ULL * 70 + 86400 * 17;
  	return (((u_int64_t)unixtime) + base)*100;
  }
  
  /*
   * Add "ARCHIMEDES" metadata to a node if that seems appropriate.
   *
   * We touch regular files with names matching /,[0-9a-f]{3}$/ and
   * directories matching /^!/.
   */
  static void
  archimedes_convert_node(cd9660node *node)
  {
  	struct ISO_ARCHIMEDES *arc;
  	size_t len;
  	int type = -1;
  	uint64_t stamp;
  
  	if (node->su_tail_data != NULL)
  		/* Something else already has the tail. */
  		return;
  
  	len = strlen(node->node->name);
  	if (len < 1) return;
  
  	if (len >= 4 && node->node->name[len-4] == ',')
  		/* XXX should support ,xxx and ,lxa */
  		type = strtoul(node->node->name + len - 3, NULL, 16);
  	if (type == -1 && node->node->name[0] != '!')
  		return;
  	if (type == -1) type = 0;
  
  	assert(sizeof(struct ISO_ARCHIMEDES) == 32);
  	if ((arc = calloc(1, sizeof(struct ISO_ARCHIMEDES))) == NULL) {
  		CD9660_MEM_ALLOC_ERROR("archimedes_convert_node");
  		exit(1);
  	}
  
  	stamp = riscos_date(node->node->inode->st.st_mtime);
  
  	memcpy(arc->magic, "ARCHIMEDES", 10);
  	cd9660_731(0xfff00000 | (type << 8) | (stamp >> 32), arc->loadaddr);
  	cd9660_731(stamp & 0x00ffffffffULL, arc->execaddr);
  	arc->ro_attr = RO_ACCESS_UR | RO_ACCESS_OR;
  	arc->cdfs_attr = node->node->name[0] == '!' ? CDFS_PLING : 0;
  	node->su_tail_data = (void *)arc;
  	node->su_tail_size = sizeof(*arc);
  }
  
  /*
   * Add "ARCHIMEDES" metadata to an entire tree recursively.
   */
  void
  archimedes_convert_tree(cd9660node *node)
  {
  	cd9660node *cn;
  
  	assert(node != NULL);
  
  	archimedes_convert_node(node);
  
  		/* Recurse on children. */
  	TAILQ_FOREACH(cn, &node->cn_children, cn_next_child)
  		archimedes_convert_tree(cn);
  }
  