/* $NetBSD: cd9660_util.c,v 1.14 2016/03/09 20:18:17 christos Exp $ */
/*-
* Copyright (c) 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley
* by Pace Willisson (pace@blitz.com). The Rock Ridge Extension
* Support code is derived from software contributed to Berkeley
* by Atsushi Murai (amurai@spec.co.jp).
*
* 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. 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_util.c 8.3 (Berkeley) 12/5/94
*/
#include <sys/cdefs.h>
#ifdef _KERNEL
__KERNEL_RCSID(0, "$NetBSD: cd9660_util.c,v 1.14 2016/03/09 20:18:17 christos Exp $");
#else
/* used by macppc_installboot */
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#endif
#include <sys/param.h>
#ifdef _KERNEL
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/resourcevar.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/dirent.h>
#else
#include <assert.h>
#include <dirent.h>
#define KASSERT(x) assert(x) /* XXX for <fs/unicode.h> */
#endif
#include <fs/cd9660/iso.h>
#ifdef _KERNEL
#include <fs/cd9660/cd9660_extern.h>
#else
static int isochar(const u_char *, const u_char *, int, uint16_t *);
#endif
#include <fs/unicode.h>
static uint16_t wget(const u_char **, size_t *, int);
static int wput(u_char *, size_t, uint16_t, int);
int cd9660_utf8_joliet = 1;
/*
* Get one character out of an iso filename
* Return number of bytes consumed
*/
int
isochar(const u_char *isofn, const u_char *isoend, int joliet_level,
uint16_t *c)
{
*c = isofn[0];
if (joliet_level == 0 || isofn + 1 == isoend) {
/* (00) and (01) are one byte in Joliet, too */
return 1;
}
if (cd9660_utf8_joliet) {
*c = (*c << 8) + isofn[1];
} else {
/* characters outside ISO-8859-1 subset replaced with '?' */
if (*c != 0)
*c = '?';
else
*c = isofn[1];
}
return 2;
}
/*
* translate and compare a filename
* Note: Version number plus ';' may be omitted.
*/
int
isofncmp(const u_char *fn, size_t fnlen, const u_char *isofn, size_t isolen,
int joliet_level)
{
int i, j;
uint16_t fc, ic;
const u_char *isoend = isofn + isolen;
#ifdef ISOFNCMPDEBUG
printf("fn = %s, fnlen = %zu, isofn = %s, isolen = %zu\n",
fn, fnlen, isofn, isolen);
#endif
while (fnlen > 0) {
fc = wget(&fn, &fnlen, joliet_level);
if (isofn == isoend)
return fc;
isofn += isochar(isofn, isoend, joliet_level, &ic);
if (ic == ';') {
switch (fc) {
default:
return fc;
case 0:
return 0;
case ';':
break;
}
for (i = 0; fnlen-- != 0; i = i * 10 + *fn++ - '0') {
if (*fn < '0' || *fn > '9') {
return -1;
}
}
for (j = 0; isofn != isoend; j = j * 10 + ic - '0')
isofn += isochar(isofn, isoend,
joliet_level, &ic);
return i - j;
}
if (ic != fc) {
if (ic >= 'A' && ic <= 'Z') {
if (ic + ('a' - 'A') != fc) {
if (fc >= 'a' && fc <= 'z')
fc -= 'a' - 'A';
return (int)fc - (int)ic;
}
} else
return (int)fc - (int)ic;
}
}
if (isofn != isoend) {
isofn += isochar(isofn, isoend, joliet_level, &ic);
switch (ic) {
default:
return -1;
case '.':
if (isofn != isoend) {
isochar(isofn, isoend, joliet_level, &ic);
if (ic == ';')
return 0;
}
return -1;
case ';':
return 0;
}
}
return 0;
}
/*
* translate a filename
*/
void
isofntrans(const u_char *infn, int infnlen, u_char *outfn, u_short *outfnlen,
int original, int casetrans, int assoc, int joliet_level)
{
int fnidx = 0;
const u_char *infnend = infn + infnlen;
uint16_t c;
int sz;
if (assoc) {
*outfn++ = ASSOCCHAR;
fnidx++;
}
for(; infn != infnend; fnidx += sz) {
infn += isochar(infn, infnend, joliet_level, &c);
if (casetrans && joliet_level == 0 && c >= 'A' && c <= 'Z')
c = c + ('a' - 'A');
else if (!original && c == ';') {
if (fnidx > 0 && outfn[-1] == '.')
fnidx--;
break;
}
sz = wput(outfn, ISO_MAXNAMLEN - fnidx, c, joliet_level);
if (sz == 0) {
/* not enough space to write the character */
if (fnidx < ISO_MAXNAMLEN) {
*outfn = '?';
fnidx++;
}
break;
}
outfn += sz;
}
*outfnlen = fnidx;
}
static uint16_t
wget(const u_char **str, size_t *sz, int joliet_level)
{
if (joliet_level > 0 && cd9660_utf8_joliet) {
/* decode UTF-8 sequence */
return wget_utf8((const char **) str, sz);
} else {
/*
* Raw 8-bit characters without any conversion. For Joliet,
* this effectively assumes provided file name is using
* ISO-8859-1 subset.
*/
uint16_t c = *str[0];
(*str)++;
(*sz)--;
return c;
}
}
static int
wput(u_char *s, size_t n, uint16_t c, int joliet_level)
{
if (joliet_level > 0 && cd9660_utf8_joliet) {
/* Store Joliet file name encoded into UTF-8 */
return wput_utf8((char *)s, n, c);
} else {
/*
* Store raw 8-bit characters without any conversion.
* For Joliet case, this filters the Unicode characters
* to ISO-8859-1 subset.
*/
*s = (u_char)c;
return 1;
}
}