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/*
* ISO 9660 filesystem backend for GRUB (GRand Unified Bootloader)
* including Rock Ridge Extensions support
*
* Copyright (C) 1998, 1999 Kousuke Takai <tak@kmc.kyoto-u.ac.jp>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
/*
* References:
* linux/fs/isofs/rock.[ch]
* mkisofs-1.11.1/diag/isoinfo.c
* mkisofs-1.11.1/iso9660.h
* (all are written by Eric Youngdale)
*
* Modifications by:
* Leonid Lisovskiy <lly@pisem.net> 2003
*/
/*
* Modified to make it work with FILO
* 2003-10 by SONE Takeshi
*/
#ifdef FSYS_ISO9660
#include "shared.h"
#include "filesys.h"
#include "iso9660.h"
#include "debug.h"
#if defined(__sparc__) || defined(__PPC__)
#define ENDIAN b
#else
#define ENDIAN l
#endif
struct iso_superblock {
unsigned long vol_sector;
unsigned long file_start;
};
#define ISO_SUPER ((struct iso_superblock *)(FSYS_BUF))
#define PRIMDESC ((struct iso_primary_descriptor *)(FSYS_BUF + 2048))
#define DIRREC ((struct iso_directory_record *)(FSYS_BUF + 4096))
#define RRCONT_BUF ((unsigned char *)(FSYS_BUF + 6144))
#define NAME_BUF ((unsigned char *)(FSYS_BUF + 8192))
static int
iso9660_devread (int sector, int byte_offset, int byte_len, char *buf)
{
/* FILO uses 512-byte "soft" sector, and ISO-9660 uses 2048-byte
* CD-ROM sector */
return devread(sector<<2, byte_offset, byte_len, buf);
}
int
iso9660_mount (void)
{
unsigned int sector;
/*
* Because there is no defined slice type ID for ISO-9660 filesystem,
* this test will pass only either (1) if entire disk is used, or
* (2) if current partition is BSD style sub-partition whose ID is
* ISO-9660.
*/
/*if ((current_partition != 0xFFFFFF)
&& !IS_PC_SLICE_TYPE_BSD_WITH_FS(current_slice, FS_ISO9660))
return 0;*/
/*
* Currently, only FIRST session of MultiSession disks are supported !!!
*/
for (sector = 16 ; sector < 32 ; sector++)
{
if (!iso9660_devread(sector, 0, sizeof(*PRIMDESC), (char *)PRIMDESC))
break;
/* check ISO_VD_PRIMARY and ISO_STANDARD_ID */
if (CHECK4(&PRIMDESC->type, ISO_VD_PRIMARY, 'C', 'D', '0')
&& CHECK2(PRIMDESC->id + 3, '0', '1'))
{
ISO_SUPER->vol_sector = sector;
ISO_SUPER->file_start = 0;
fsmax = PRIMDESC->volume_space_size.ENDIAN;
return 1;
}
}
return 0;
}
int
iso9660_dir (char *dirname)
{
struct iso_directory_record *idr;
RR_ptr_t rr_ptr;
struct rock_ridge *ce_ptr;
unsigned int pathlen;
int size;
unsigned int extent;
unsigned int rr_len;
unsigned char file_type;
unsigned char rr_flag;
idr = &PRIMDESC->root_directory_record;
ISO_SUPER->file_start = 0;
do
{
while (*dirname == '/') /* skip leading slashes */
dirname++;
/* pathlen = strcspn(dirname, "/\n\t "); */
for (pathlen = 0 ;
dirname[pathlen]
&& !isspace(dirname[pathlen]) && dirname[pathlen] != '/' ;
pathlen++)
;
size = idr->size.ENDIAN;
extent = idr->extent.ENDIAN;
while (size > 0)
{
if (!iso9660_devread(extent, 0, ISO_SECTOR_SIZE, (char *)DIRREC))
{
errnum = ERR_FSYS_CORRUPT;
return 0;
}
extent++;
idr = (struct iso_directory_record *)DIRREC;
for (; idr->length.ENDIAN > 0;
idr = (struct iso_directory_record *)((char *)idr + idr->length.ENDIAN) )
{
const char *name = (char *)idr->name;
unsigned int name_len = idr->name_len.ENDIAN;
file_type = (idr->flags.ENDIAN & 2) ? ISO_DIRECTORY : ISO_REGULAR;
if (name_len == 1)
{
if ((name[0] == 0) || /* self */
(name[0] == 1)) /* parent */
continue;
}
if (name_len > 2 && CHECK2(name + name_len - 2, ';', '1'))
{
name_len -= 2; /* truncate trailing file version */
if (name_len > 1 && name[name_len - 1] == '.')
name_len--; /* truncate trailing dot */
}
/*
* Parse Rock-Ridge extension
*/
rr_len = (idr->length.ENDIAN - idr->name_len.ENDIAN
- (unsigned char)sizeof(struct iso_directory_record)
+ (unsigned char)sizeof(idr->name));
rr_ptr.ptr = ((char *)idr + idr->name_len.ENDIAN
+ sizeof(struct iso_directory_record)
- sizeof(idr->name));
if (rr_len & 1)
rr_ptr.ptr++, rr_len--;
ce_ptr = NULL;
rr_flag = RR_FLAG_NM | RR_FLAG_PX;
while (rr_len >= 4)
{
if (rr_ptr.rr->version != 1)
{
#ifndef STAGE1_5
if (debug)
printf(
"Non-supported version (%d) RockRidge chunk "
"`%c%c'\n", rr_ptr.rr->version,
rr_ptr.rr->signature & 0xFF,
rr_ptr.rr->signature >> 8);
#endif
}
else if (CHECK2(&rr_ptr.rr->signature, 'R', 'R')
&& rr_ptr.rr->len >= 5)
rr_flag &= rr_ptr.rr->u.rr.flags.ENDIAN;
else if (CHECK2(&rr_ptr.rr->signature, 'N', 'M'))
{
name = (char *)rr_ptr.rr->u.nm.name;
name_len = rr_ptr.rr->len - 5;
rr_flag &= ~RR_FLAG_NM;
}
else if (CHECK2(&rr_ptr.rr->signature, 'P', 'X')
&& rr_ptr.rr->len >= 36)
{
file_type = ((rr_ptr.rr->u.px.mode.ENDIAN & POSIX_S_IFMT)
== POSIX_S_IFREG
? ISO_REGULAR
: ((rr_ptr.rr->u.px.mode.ENDIAN & POSIX_S_IFMT)
== POSIX_S_IFDIR
? ISO_DIRECTORY : ISO_OTHER));
rr_flag &= ~RR_FLAG_PX;
}
else if (CHECK2(&rr_ptr.rr->signature, 'C', 'E')
&& rr_ptr.rr->len >= 28)
ce_ptr = rr_ptr.rr;
if (!rr_flag)
/*
* There is no more extension we expects...
*/
break;
rr_len -= rr_ptr.rr->len;
rr_ptr.ptr += rr_ptr.rr->len;
if (rr_len < 4 && ce_ptr != NULL)
{
/* preserve name before loading new extent. */
if( RRCONT_BUF <= (unsigned char *)name
&& (unsigned char *)name < RRCONT_BUF + ISO_SECTOR_SIZE )
{
memcpy(NAME_BUF, name, name_len);
name = (char *)NAME_BUF;
}
rr_ptr.ptr = (char *)(RRCONT_BUF + ce_ptr->u.ce.offset.ENDIAN);
rr_len = ce_ptr->u.ce.size.ENDIAN;
if (!iso9660_devread(ce_ptr->u.ce.extent.ENDIAN, 0,
ISO_SECTOR_SIZE, (char *)RRCONT_BUF))
{
errnum = 0; /* this is not fatal. */
break;
}
ce_ptr = NULL;
}
} /* rr_len >= 4 */
filemax = MAXINT;
if (name_len >= pathlen
&& !strnicmp(name, dirname, pathlen))
{
if (dirname[pathlen] == '/' || !print_possibilities)
{
/*
* DIRNAME is directory component of pathname,
* or we are to open a file.
*/
if (pathlen == name_len)
{
if (dirname[pathlen] == '/')
{
if (file_type != ISO_DIRECTORY)
{
errnum = ERR_BAD_FILETYPE;
return 0;
}
goto next_dir_level;
}
if (file_type != ISO_REGULAR)
{
errnum = ERR_BAD_FILETYPE;
return 0;
}
ISO_SUPER->file_start = idr->extent.ENDIAN;
filepos = 0;
filemax = idr->size.ENDIAN;
return 1;
}
}
else /* Completion */
{
#ifndef STAGE1_5
if (print_possibilities > 0)
print_possibilities = -print_possibilities;
memcpy(NAME_BUF, name, name_len);
NAME_BUF[name_len] = '\0';
print_a_completion (NAME_BUF);
#endif
}
}
} /* for */
size -= ISO_SECTOR_SIZE;
} /* size>0 */
if (dirname[pathlen] == '/' || print_possibilities >= 0)
{
errnum = ERR_FILE_NOT_FOUND;
return 0;
}
next_dir_level:
dirname += pathlen;
} while (*dirname == '/');
return 1;
}
int
iso9660_read (char *buf, int len)
{
int sector, blkoffset, size, ret;
if (ISO_SUPER->file_start == 0)
return 0;
ret = 0;
blkoffset = filepos & (ISO_SECTOR_SIZE - 1);
sector = filepos >> ISO_SECTOR_BITS;
while (len > 0)
{
size = ISO_SECTOR_SIZE - blkoffset;
if (size > len)
size = len;
disk_read_func = disk_read_hook;
if (!iso9660_devread(ISO_SUPER->file_start + sector, blkoffset, size, buf))
return 0;
disk_read_func = NULL;
len -= size;
buf += size;
ret += size;
filepos += size;
sector++;
blkoffset = 0;
}
return ret;
}
#endif /* FSYS_ISO9660 */
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