cd9660_rrip.c

早期freebsd实现

/*-
 * Copyright (c) 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley
 * by Pace Willisson ([e-mail]).  The Rock Ridge Extension
 * Support code is derived from software contributed to Berkeley
 * by Atsushi Murai ([e-mail]).
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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_rrip.c	8.2 (Berkeley) 1/23/94
 */

#include <sys/param.h>
#include <sys/namei.h>
#include <sys/buf.h>
#include <sys/file.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/kernel.h>
#include <sys/stat.h>
#include <sys/types.h>

#include <sys/time.h>

#include <isofs/cd9660/iso.h>
#include <isofs/cd9660/cd9660_node.h>
#include <isofs/cd9660/cd9660_rrip.h>
#include <isofs/cd9660/iso_rrip.h>

/*
 * POSIX file attribute
 */
static int
cd9660_rrip_attr(p,ana)
	ISO_RRIP_ATTR *p;
	ISO_RRIP_ANALYZE *ana;
{
	ana->inop->inode.iso_mode = isonum_731(p->mode_l);
	ana->inop->inode.iso_uid = (uid_t)isonum_731(p->uid_l);
	ana->inop->inode.iso_gid = (gid_t)isonum_731(p->gid_l);
	ana->inop->inode.iso_links = isonum_731(p->links_l);
	ana->fields &= ~ISO_SUSP_ATTR;
	return ISO_SUSP_ATTR;
}

static void
cd9660_rrip_defattr(isodir,ana)
	struct iso_directory_record *isodir;
	ISO_RRIP_ANALYZE *ana;
{
	/* But this is a required field! */
	printf("RRIP without PX field?\n");
	cd9660_defattr(isodir,ana->inop,NULL);
}

/*
 * Symbolic Links
 */
static int
cd9660_rrip_slink(p,ana)
	ISO_RRIP_SLINK  *p;
	ISO_RRIP_ANALYZE *ana;
{
	register ISO_RRIP_SLINK_COMPONENT *pcomp;
	register ISO_RRIP_SLINK_COMPONENT *pcompe;
	int len, wlen, cont;
	char *outbuf, *inbuf;
	
	pcomp = (ISO_RRIP_SLINK_COMPONENT *)p->component;
	pcompe = (ISO_RRIP_SLINK_COMPONENT *)((char *)p + isonum_711(p->h.length));
	len = *ana->outlen;
	outbuf = ana->outbuf;
	cont = ana->cont;
	
	/*
	 * Gathering a Symbolic name from each component with path
	 */
	for (;
	     pcomp < pcompe;
	     pcomp = (ISO_RRIP_SLINK_COMPONENT *)((char *)pcomp + ISO_RRIP_SLSIZ
						  + isonum_711(pcomp->clen))) {
		
		if (!cont) {
			if (len < ana->maxlen) {
				len++;
				*outbuf++ = '/';
			}
		}
		cont = 0;
		
		inbuf = "..";
		wlen = 0;
		
		switch (*pcomp->cflag) {
			
		case ISO_SUSP_CFLAG_CURRENT:
			/* Inserting Current */
			wlen = 1;
			break;
			
		case ISO_SUSP_CFLAG_PARENT:
			/* Inserting Parent */
			wlen = 2;
			break;
			
		case ISO_SUSP_CFLAG_ROOT:
			/* Inserting slash for ROOT */
			/* start over from beginning(?) */
			outbuf -= len;
			len = 0;
			break;
			
		case ISO_SUSP_CFLAG_VOLROOT:
			/* Inserting a mount point i.e. "/cdrom" */
			/* same as above */
			outbuf -= len;
			len = 0;
			inbuf = ana->imp->im_mountp->mnt_stat.f_mntonname;
			wlen = strlen(inbuf);
			break;
			
		case ISO_SUSP_CFLAG_HOST:
			/* Inserting hostname i.e. "kurt.tools.de" */
			inbuf = hostname;
			wlen = hostnamelen;
			break;
			
		case ISO_SUSP_CFLAG_CONTINUE:
			cont = 1;
			/* fall thru */
		case 0:
			/* Inserting component */
			wlen = isonum_711(pcomp->clen);
			inbuf = pcomp->name;
			break;
		default:
			printf("RRIP with incorrect flags?");
			wlen = ana->maxlen + 1;
			break;
		}
		
		if (len + wlen > ana->maxlen) {
			/* indicate error to caller */
			ana->cont = 1;
			ana->fields = 0;
			ana->outbuf -= *ana->outlen;
			*ana->outlen = 0;
			return 0;
		}
		
		bcopy(inbuf,outbuf,wlen);
		outbuf += wlen;
		len += wlen;
		
	}
	ana->outbuf = outbuf;
	*ana->outlen = len;
	ana->cont = cont;
	
	if (!isonum_711(p->flags)) {
		ana->fields &= ~ISO_SUSP_SLINK;
		return ISO_SUSP_SLINK;
	}
	return 0;
}

/*
 * Alternate name
 */
static int
cd9660_rrip_altname(p,ana)
	ISO_RRIP_ALTNAME *p;
	ISO_RRIP_ANALYZE *ana;
{
	char *inbuf;
	int wlen;
	int cont;
	
	inbuf = "..";
	wlen = 0;
	cont = 0;
	
	switch (*p->flags) {
	case ISO_SUSP_CFLAG_CURRENT:
		/* Inserting Current */
		wlen = 1;
		break;
		
	case ISO_SUSP_CFLAG_PARENT:
		/* Inserting Parent */
		wlen = 2;
		break;
		
	case ISO_SUSP_CFLAG_HOST:
		/* Inserting hostname i.e. "kurt.tools.de" */
		inbuf = hostname;
		wlen = hostnamelen;
		break;
		
	case ISO_SUSP_CFLAG_CONTINUE:
		cont = 1;
		/* fall thru */
	case 0:
		/* Inserting component */
		wlen = isonum_711(p->h.length) - 5;
		inbuf = (char *)p + 5;
		break;
		
	default:
		printf("RRIP with incorrect NM flags?\n");
		wlen = ana->maxlen + 1;
		break;
	}
	
	if ((*ana->outlen += wlen) > ana->maxlen) {
		/* treat as no name field */
		ana->fields &= ~ISO_SUSP_ALTNAME;
		ana->outbuf -= *ana->outlen - wlen;
		*ana->outlen = 0;
		return 0;
	}
	
	bcopy(inbuf,ana->outbuf,wlen);
	ana->outbuf += wlen;
	
	if (!cont) {
		ana->fields &= ~ISO_SUSP_ALTNAME;
		return ISO_SUSP_ALTNAME;
	}
	return 0;
}

static void
cd9660_rrip_defname(isodir,ana)
	struct iso_directory_record *isodir;
	ISO_RRIP_ANALYZE *ana;
{
	strcpy(ana->outbuf,"..");
	switch (*isodir->name) {
	default:
		isofntrans(isodir->name,isonum_711(isodir->name_len),
			   ana->outbuf,ana->outlen,
			   1,isonum_711(isodir->flags)&4);
		break;
	case 0:
		*ana->outlen = 1;
		break;
	case 1:
		*ana->outlen = 2;
		break;
	}
}

/*
 * Parent or Child Link
 */
static int
cd9660_rrip_pclink(p,ana)
	ISO_RRIP_CLINK  *p;
	ISO_RRIP_ANALYZE *ana;
{
	*ana->inump = isonum_733(p->dir_loc) << ana->imp->im_bshift;
	ana->fields &= ~(ISO_SUSP_CLINK|ISO_SUSP_PLINK);
	return *p->h.type == 'C' ? ISO_SUSP_CLINK : ISO_SUSP_PLINK;
}

/*
 * Relocated directory
 */
static int
cd9660_rrip_reldir(p,ana)
	ISO_RRIP_RELDIR  *p;
	ISO_RRIP_ANALYZE *ana;
{
	/* special hack to make caller aware of RE field */
	*ana->outlen = 0;
	ana->fields = 0;
	return ISO_SUSP_RELDIR|ISO_SUSP_ALTNAME|ISO_SUSP_CLINK|ISO_SUSP_PLINK;
}

static int
cd9660_rrip_tstamp(p,ana)
	ISO_RRIP_TSTAMP *p;
	ISO_RRIP_ANALYZE *ana;
{
	unsigned char *ptime;
	
	ptime = p->time;
	
	/* Check a format of time stamp (7bytes/17bytes) */
	if (!(*p->flags&ISO_SUSP_TSTAMP_FORM17)) {
		if (*p->flags&ISO_SUSP_TSTAMP_CREAT)
			ptime += 7;
		
		if (*p->flags&ISO_SUSP_TSTAMP_MODIFY) {
			cd9660_tstamp_conv7(ptime,&ana->inop->inode.iso_mtime);
			ptime += 7;
		} else
			bzero(&ana->inop->inode.iso_mtime,sizeof(struct timeval));
		
		if (*p->flags&ISO_SUSP_TSTAMP_ACCESS) {
			cd9660_tstamp_conv7(ptime,&ana->inop->inode.iso_atime);
			ptime += 7;
		} else
			ana->inop->inode.iso_atime = ana->inop->inode.iso_mtime;
		
		if (*p->flags&ISO_SUSP_TSTAMP_ATTR)
			cd9660_tstamp_conv7(ptime,&ana->inop->inode.iso_ctime);
		else
			ana->inop->inode.iso_ctime = ana->inop->inode.iso_mtime;
		
	} else {
		if (*p->flags&ISO_SUSP_TSTAMP_CREAT)
			ptime += 17;