mirror of
https://github.com/ventoy/Ventoy.git
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1150 lines
29 KiB
C
1150 lines
29 KiB
C
/* iso9660.c - iso9660 implementation with extensions:
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SUSP, Rock Ridge. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2004,2005,2006,2007,2008,2009,2010 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/err.h>
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#include <grub/file.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/disk.h>
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#include <grub/dl.h>
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#include <grub/types.h>
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#include <grub/fshelp.h>
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#include <grub/charset.h>
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#include <grub/datetime.h>
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#include <grub/ventoy.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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static grub_uint64_t g_ventoy_last_read_pos = 0;
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static grub_uint64_t g_ventoy_last_read_offset = 0;
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static grub_uint64_t g_ventoy_last_read_dirent_pos = 0;
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static grub_uint64_t g_ventoy_last_read_dirent_offset = 0;
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static grub_uint64_t g_ventoy_last_file_dirent_pos = 0;
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static grub_uint64_t g_ventoy_last_file_dirent_offset = 0;
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#define GRUB_ISO9660_FSTYPE_DIR 0040000
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#define GRUB_ISO9660_FSTYPE_REG 0100000
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#define GRUB_ISO9660_FSTYPE_SYMLINK 0120000
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#define GRUB_ISO9660_FSTYPE_MASK 0170000
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#define GRUB_ISO9660_LOG2_BLKSZ 2
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#define GRUB_ISO9660_BLKSZ 2048
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#define GRUB_ISO9660_RR_DOT 2
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#define GRUB_ISO9660_RR_DOTDOT 4
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#define GRUB_ISO9660_VOLDESC_BOOT 0
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#define GRUB_ISO9660_VOLDESC_PRIMARY 1
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#define GRUB_ISO9660_VOLDESC_SUPP 2
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#define GRUB_ISO9660_VOLDESC_PART 3
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#define GRUB_ISO9660_VOLDESC_END 255
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/* The head of a volume descriptor. */
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struct grub_iso9660_voldesc
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{
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grub_uint8_t type;
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grub_uint8_t magic[5];
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grub_uint8_t version;
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} GRUB_PACKED;
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struct grub_iso9660_date2
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{
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grub_uint8_t year;
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grub_uint8_t month;
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grub_uint8_t day;
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grub_uint8_t hour;
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grub_uint8_t minute;
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grub_uint8_t second;
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grub_uint8_t offset;
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} GRUB_PACKED;
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/* A directory entry. */
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struct grub_iso9660_dir
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{
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grub_uint8_t len;
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grub_uint8_t ext_sectors;
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grub_uint32_t first_sector;
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grub_uint32_t first_sector_be;
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grub_uint32_t size;
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grub_uint32_t size_be;
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struct grub_iso9660_date2 mtime;
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grub_uint8_t flags;
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grub_uint8_t unused2[6];
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#define MAX_NAMELEN 255
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grub_uint8_t namelen;
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} GRUB_PACKED;
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struct grub_iso9660_date
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{
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grub_uint8_t year[4];
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grub_uint8_t month[2];
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grub_uint8_t day[2];
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grub_uint8_t hour[2];
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grub_uint8_t minute[2];
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grub_uint8_t second[2];
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grub_uint8_t hundredth[2];
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grub_uint8_t offset;
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} GRUB_PACKED;
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/* The primary volume descriptor. Only little endian is used. */
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struct grub_iso9660_primary_voldesc
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{
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struct grub_iso9660_voldesc voldesc;
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grub_uint8_t unused1[33];
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grub_uint8_t volname[32];
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grub_uint8_t unused2[16];
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grub_uint8_t escape[32];
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grub_uint8_t unused3[12];
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grub_uint32_t path_table_size;
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grub_uint8_t unused4[4];
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grub_uint32_t path_table;
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grub_uint8_t unused5[12];
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struct grub_iso9660_dir rootdir;
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grub_uint8_t unused6[624];
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struct grub_iso9660_date created;
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struct grub_iso9660_date modified;
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} GRUB_PACKED;
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/* A single entry in the path table. */
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struct grub_iso9660_path
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{
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grub_uint8_t len;
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grub_uint8_t sectors;
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grub_uint32_t first_sector;
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grub_uint16_t parentdir;
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grub_uint8_t name[0];
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} GRUB_PACKED;
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/* An entry in the System Usage area of the directory entry. */
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struct grub_iso9660_susp_entry
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{
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grub_uint8_t sig[2];
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grub_uint8_t len;
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grub_uint8_t version;
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grub_uint8_t data[0];
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} GRUB_PACKED;
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/* The CE entry. This is used to describe the next block where data
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can be found. */
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struct grub_iso9660_susp_ce
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{
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struct grub_iso9660_susp_entry entry;
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grub_uint32_t blk;
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grub_uint32_t blk_be;
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grub_uint32_t off;
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grub_uint32_t off_be;
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grub_uint32_t len;
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grub_uint32_t len_be;
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} GRUB_PACKED;
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struct grub_iso9660_data
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{
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struct grub_iso9660_primary_voldesc voldesc;
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grub_disk_t disk;
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int rockridge;
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int susp_skip;
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int joliet;
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struct grub_fshelp_node *node;
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};
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struct grub_fshelp_node
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{
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struct grub_iso9660_data *data;
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grub_size_t have_dirents, alloc_dirents;
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int have_symlink;
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struct grub_iso9660_dir dirents[8];
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char symlink[0];
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};
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enum
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{
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FLAG_TYPE_PLAIN = 0,
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FLAG_TYPE_DIR = 2,
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FLAG_TYPE = 3,
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FLAG_MORE_EXTENTS = 0x80
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};
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static grub_dl_t my_mod;
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static grub_err_t
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iso9660_to_unixtime (const struct grub_iso9660_date *i, grub_int32_t *nix)
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{
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struct grub_datetime datetime;
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if (! i->year[0] && ! i->year[1]
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&& ! i->year[2] && ! i->year[3]
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&& ! i->month[0] && ! i->month[1]
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&& ! i->day[0] && ! i->day[1]
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&& ! i->hour[0] && ! i->hour[1]
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&& ! i->minute[0] && ! i->minute[1]
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&& ! i->second[0] && ! i->second[1]
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&& ! i->hundredth[0] && ! i->hundredth[1])
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return grub_error (GRUB_ERR_BAD_NUMBER, "empty date");
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datetime.year = (i->year[0] - '0') * 1000 + (i->year[1] - '0') * 100
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+ (i->year[2] - '0') * 10 + (i->year[3] - '0');
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datetime.month = (i->month[0] - '0') * 10 + (i->month[1] - '0');
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datetime.day = (i->day[0] - '0') * 10 + (i->day[1] - '0');
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datetime.hour = (i->hour[0] - '0') * 10 + (i->hour[1] - '0');
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datetime.minute = (i->minute[0] - '0') * 10 + (i->minute[1] - '0');
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datetime.second = (i->second[0] - '0') * 10 + (i->second[1] - '0');
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if (!grub_datetime2unixtime (&datetime, nix))
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return grub_error (GRUB_ERR_BAD_NUMBER, "incorrect date");
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*nix -= i->offset * 60 * 15;
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return GRUB_ERR_NONE;
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}
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static int
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iso9660_to_unixtime2 (const struct grub_iso9660_date2 *i, grub_int32_t *nix)
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{
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struct grub_datetime datetime;
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datetime.year = i->year + 1900;
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datetime.month = i->month;
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datetime.day = i->day;
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datetime.hour = i->hour;
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datetime.minute = i->minute;
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datetime.second = i->second;
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if (!grub_datetime2unixtime (&datetime, nix))
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return 0;
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*nix -= i->offset * 60 * 15;
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return 1;
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}
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static grub_err_t
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read_node (grub_fshelp_node_t node, grub_off_t off, grub_size_t len, char *buf)
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{
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grub_size_t i = 0;
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while (len > 0)
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{
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grub_size_t toread;
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grub_err_t err;
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while (i < node->have_dirents
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&& off >= grub_le_to_cpu32 (node->dirents[i].size))
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{
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off -= grub_le_to_cpu32 (node->dirents[i].size);
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i++;
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}
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if (i == node->have_dirents)
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return grub_error (GRUB_ERR_OUT_OF_RANGE, "read out of range");
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toread = grub_le_to_cpu32 (node->dirents[i].size);
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if (toread > len)
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toread = len;
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g_ventoy_last_read_pos = ((grub_disk_addr_t) grub_le_to_cpu32 (node->dirents[i].first_sector)) << GRUB_ISO9660_LOG2_BLKSZ;
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g_ventoy_last_read_offset = off;
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err = grub_disk_read (node->data->disk, g_ventoy_last_read_pos, off, toread, buf);
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if (err)
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return err;
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len -= toread;
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off += toread;
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buf += toread;
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}
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return GRUB_ERR_NONE;
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}
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/* Iterate over the susp entries, starting with block SUA_BLOCK on the
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offset SUA_POS with a size of SUA_SIZE bytes. Hook is called for
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every entry. */
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static grub_err_t
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grub_iso9660_susp_iterate (grub_fshelp_node_t node, grub_off_t off,
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grub_ssize_t sua_size,
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grub_err_t (*hook)
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(struct grub_iso9660_susp_entry *entry, void *hook_arg),
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void *hook_arg)
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{
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char *sua;
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struct grub_iso9660_susp_entry *entry;
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grub_err_t err;
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if (sua_size <= 0)
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return GRUB_ERR_NONE;
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sua = grub_malloc (sua_size);
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if (!sua)
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return grub_errno;
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/* Load a part of the System Usage Area. */
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err = read_node (node, off, sua_size, sua);
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if (err)
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return err;
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for (entry = (struct grub_iso9660_susp_entry *) sua; (char *) entry < (char *) sua + sua_size - 1 && entry->len > 0;
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entry = (struct grub_iso9660_susp_entry *)
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((char *) entry + entry->len))
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{
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/* The last entry. */
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if (grub_strncmp ((char *) entry->sig, "ST", 2) == 0)
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break;
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/* Additional entries are stored elsewhere. */
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if (grub_strncmp ((char *) entry->sig, "CE", 2) == 0)
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{
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struct grub_iso9660_susp_ce *ce;
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grub_disk_addr_t ce_block;
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ce = (struct grub_iso9660_susp_ce *) entry;
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sua_size = grub_le_to_cpu32 (ce->len);
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off = grub_le_to_cpu32 (ce->off);
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ce_block = grub_le_to_cpu32 (ce->blk) << GRUB_ISO9660_LOG2_BLKSZ;
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grub_free (sua);
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sua = grub_malloc (sua_size);
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if (!sua)
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return grub_errno;
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/* Load a part of the System Usage Area. */
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err = grub_disk_read (node->data->disk, ce_block, off,
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sua_size, sua);
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if (err)
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return err;
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entry = (struct grub_iso9660_susp_entry *) sua;
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}
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if (hook (entry, hook_arg))
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{
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grub_free (sua);
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return 0;
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}
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}
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grub_free (sua);
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return 0;
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}
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static char *
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grub_iso9660_convert_string (grub_uint8_t *us, int len)
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{
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char *p;
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int i;
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grub_uint16_t t[MAX_NAMELEN / 2 + 1];
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p = grub_malloc (len * GRUB_MAX_UTF8_PER_UTF16 + 1);
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if (! p)
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return NULL;
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for (i=0; i<len; i++)
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t[i] = grub_be_to_cpu16 (grub_get_unaligned16 (us + 2 * i));
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*grub_utf16_to_utf8 ((grub_uint8_t *) p, t, len) = '\0';
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return p;
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}
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static grub_err_t
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susp_iterate_set_rockridge (struct grub_iso9660_susp_entry *susp_entry,
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void *_data)
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{
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struct grub_iso9660_data *data = _data;
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/* The "ER" entry is used to detect extensions. The
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`IEEE_P1285' extension means Rock ridge. */
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if (grub_strncmp ((char *) susp_entry->sig, "ER", 2) == 0)
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{
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data->rockridge = 1;
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return 1;
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}
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return 0;
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}
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static grub_err_t
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set_rockridge (struct grub_iso9660_data *data)
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{
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int sua_pos;
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int sua_size;
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char *sua;
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struct grub_iso9660_dir rootdir;
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struct grub_iso9660_susp_entry *entry;
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data->rockridge = 0;
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/* Read the system use area and test it to see if SUSP is
|
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supported. */
|
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if (grub_disk_read (data->disk,
|
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(grub_le_to_cpu32 (data->voldesc.rootdir.first_sector)
|
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<< GRUB_ISO9660_LOG2_BLKSZ), 0,
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sizeof (rootdir), (char *) &rootdir))
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return grub_error (GRUB_ERR_BAD_FS, "not a ISO9660 filesystem");
|
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|
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sua_pos = (sizeof (rootdir) + rootdir.namelen
|
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+ (rootdir.namelen % 2) - 1);
|
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sua_size = rootdir.len - sua_pos;
|
||
|
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if (!sua_size)
|
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return GRUB_ERR_NONE;
|
||
|
||
sua = grub_malloc (sua_size);
|
||
if (! sua)
|
||
return grub_errno;
|
||
|
||
if (grub_disk_read (data->disk,
|
||
(grub_le_to_cpu32 (data->voldesc.rootdir.first_sector)
|
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<< GRUB_ISO9660_LOG2_BLKSZ), sua_pos,
|
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sua_size, sua))
|
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{
|
||
grub_free (sua);
|
||
return grub_error (GRUB_ERR_BAD_FS, "not a ISO9660 filesystem");
|
||
}
|
||
|
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entry = (struct grub_iso9660_susp_entry *) sua;
|
||
|
||
/* Test if the SUSP protocol is used on this filesystem. */
|
||
if (grub_strncmp ((char *) entry->sig, "SP", 2) == 0)
|
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{
|
||
struct grub_fshelp_node rootnode;
|
||
|
||
rootnode.data = data;
|
||
rootnode.alloc_dirents = ARRAY_SIZE (rootnode.dirents);
|
||
rootnode.have_dirents = 1;
|
||
rootnode.have_symlink = 0;
|
||
rootnode.dirents[0] = data->voldesc.rootdir;
|
||
|
||
/* The 2nd data byte stored how many bytes are skipped every time
|
||
to get to the SUA (System Usage Area). */
|
||
data->susp_skip = entry->data[2];
|
||
entry = (struct grub_iso9660_susp_entry *) ((char *) entry + entry->len);
|
||
|
||
/* Iterate over the entries in the SUA area to detect
|
||
extensions. */
|
||
if (grub_iso9660_susp_iterate (&rootnode,
|
||
sua_pos, sua_size, susp_iterate_set_rockridge,
|
||
data))
|
||
{
|
||
grub_free (sua);
|
||
return grub_errno;
|
||
}
|
||
}
|
||
grub_free (sua);
|
||
return GRUB_ERR_NONE;
|
||
}
|
||
|
||
static struct grub_iso9660_data *
|
||
grub_iso9660_mount (grub_disk_t disk)
|
||
{
|
||
struct grub_iso9660_data *data = 0;
|
||
struct grub_iso9660_primary_voldesc voldesc;
|
||
int block;
|
||
|
||
data = grub_zalloc (sizeof (struct grub_iso9660_data));
|
||
if (! data)
|
||
return 0;
|
||
|
||
data->disk = disk;
|
||
|
||
block = 16;
|
||
do
|
||
{
|
||
int copy_voldesc = 0;
|
||
|
||
/* Read the superblock. */
|
||
if (grub_disk_read (disk, block << GRUB_ISO9660_LOG2_BLKSZ, 0,
|
||
sizeof (struct grub_iso9660_primary_voldesc),
|
||
(char *) &voldesc))
|
||
{
|
||
grub_error (GRUB_ERR_BAD_FS, "not a ISO9660 filesystem");
|
||
goto fail;
|
||
}
|
||
|
||
if (grub_strncmp ((char *) voldesc.voldesc.magic, "CD001", 5) != 0)
|
||
{
|
||
grub_error (GRUB_ERR_BAD_FS, "not a ISO9660 filesystem");
|
||
goto fail;
|
||
}
|
||
|
||
if (voldesc.voldesc.type == GRUB_ISO9660_VOLDESC_PRIMARY)
|
||
copy_voldesc = 1;
|
||
else if (!data->rockridge
|
||
&& (voldesc.voldesc.type == GRUB_ISO9660_VOLDESC_SUPP)
|
||
&& (voldesc.escape[0] == 0x25) && (voldesc.escape[1] == 0x2f)
|
||
&&
|
||
((voldesc.escape[2] == 0x40) || /* UCS-2 Level 1. */
|
||
(voldesc.escape[2] == 0x43) || /* UCS-2 Level 2. */
|
||
(voldesc.escape[2] == 0x45))) /* UCS-2 Level 3. */
|
||
{
|
||
copy_voldesc = 1;
|
||
data->joliet = 1;
|
||
}
|
||
|
||
if (copy_voldesc)
|
||
{
|
||
grub_memcpy((char *) &data->voldesc, (char *) &voldesc,
|
||
sizeof (struct grub_iso9660_primary_voldesc));
|
||
if (set_rockridge (data))
|
||
goto fail;
|
||
}
|
||
|
||
block++;
|
||
} while (voldesc.voldesc.type != GRUB_ISO9660_VOLDESC_END);
|
||
|
||
return data;
|
||
|
||
fail:
|
||
grub_free (data);
|
||
return 0;
|
||
}
|
||
|
||
|
||
static char *
|
||
grub_iso9660_read_symlink (grub_fshelp_node_t node)
|
||
{
|
||
return node->have_symlink
|
||
? grub_strdup (node->symlink
|
||
+ (node->have_dirents) * sizeof (node->dirents[0])
|
||
- sizeof (node->dirents)) : grub_strdup ("");
|
||
}
|
||
|
||
static grub_off_t
|
||
get_node_size (grub_fshelp_node_t node)
|
||
{
|
||
grub_off_t ret = 0;
|
||
grub_size_t i;
|
||
|
||
for (i = 0; i < node->have_dirents; i++)
|
||
ret += grub_le_to_cpu32 (node->dirents[i].size);
|
||
return ret;
|
||
}
|
||
|
||
struct iterate_dir_ctx
|
||
{
|
||
char *filename;
|
||
int filename_alloc;
|
||
enum grub_fshelp_filetype type;
|
||
char *symlink;
|
||
int was_continue;
|
||
};
|
||
|
||
/* Extend the symlink. */
|
||
static void
|
||
add_part (struct iterate_dir_ctx *ctx,
|
||
const char *part,
|
||
int len2)
|
||
{
|
||
int size = ctx->symlink ? grub_strlen (ctx->symlink) : 0;
|
||
|
||
ctx->symlink = grub_realloc (ctx->symlink, size + len2 + 1);
|
||
if (! ctx->symlink)
|
||
return;
|
||
|
||
grub_memcpy (ctx->symlink + size, part, len2);
|
||
ctx->symlink[size + len2] = 0;
|
||
}
|
||
|
||
static grub_err_t
|
||
susp_iterate_dir (struct grub_iso9660_susp_entry *entry,
|
||
void *_ctx)
|
||
{
|
||
struct iterate_dir_ctx *ctx = _ctx;
|
||
|
||
/* The filename in the rock ridge entry. */
|
||
if (grub_strncmp ("NM", (char *) entry->sig, 2) == 0)
|
||
{
|
||
/* The flags are stored at the data position 0, here the
|
||
filename type is stored. */
|
||
/* FIXME: Fix this slightly improper cast. */
|
||
if (entry->data[0] & GRUB_ISO9660_RR_DOT)
|
||
ctx->filename = (char *) ".";
|
||
else if (entry->data[0] & GRUB_ISO9660_RR_DOTDOT)
|
||
ctx->filename = (char *) "..";
|
||
else if (entry->len >= 5)
|
||
{
|
||
grub_size_t off = 0, csize = 1;
|
||
char *old;
|
||
csize = entry->len - 5;
|
||
old = ctx->filename;
|
||
if (ctx->filename_alloc)
|
||
{
|
||
off = grub_strlen (ctx->filename);
|
||
ctx->filename = grub_realloc (ctx->filename, csize + off + 1);
|
||
}
|
||
else
|
||
{
|
||
off = 0;
|
||
ctx->filename = grub_zalloc (csize + 1);
|
||
}
|
||
if (!ctx->filename)
|
||
{
|
||
ctx->filename = old;
|
||
return grub_errno;
|
||
}
|
||
ctx->filename_alloc = 1;
|
||
grub_memcpy (ctx->filename + off, (char *) &entry->data[1], csize);
|
||
ctx->filename[off + csize] = '\0';
|
||
}
|
||
}
|
||
/* The mode information (st_mode). */
|
||
else if (grub_strncmp ((char *) entry->sig, "PX", 2) == 0)
|
||
{
|
||
/* At position 0 of the PX record the st_mode information is
|
||
stored (little-endian). */
|
||
grub_uint32_t mode = ((entry->data[0] + (entry->data[1] << 8))
|
||
& GRUB_ISO9660_FSTYPE_MASK);
|
||
|
||
switch (mode)
|
||
{
|
||
case GRUB_ISO9660_FSTYPE_DIR:
|
||
ctx->type = GRUB_FSHELP_DIR;
|
||
break;
|
||
case GRUB_ISO9660_FSTYPE_REG:
|
||
ctx->type = GRUB_FSHELP_REG;
|
||
break;
|
||
case GRUB_ISO9660_FSTYPE_SYMLINK:
|
||
ctx->type = GRUB_FSHELP_SYMLINK;
|
||
break;
|
||
default:
|
||
ctx->type = GRUB_FSHELP_UNKNOWN;
|
||
}
|
||
}
|
||
else if (grub_strncmp ("SL", (char *) entry->sig, 2) == 0)
|
||
{
|
||
unsigned int pos = 1;
|
||
|
||
/* The symlink is not stored as a POSIX symlink, translate it. */
|
||
while (pos + sizeof (*entry) < entry->len)
|
||
{
|
||
/* The current position is the `Component Flag'. */
|
||
switch (entry->data[pos] & 30)
|
||
{
|
||
case 0:
|
||
{
|
||
/* The data on pos + 2 is the actual data, pos + 1
|
||
is the length. Both are part of the `Component
|
||
Record'. */
|
||
if (ctx->symlink && !ctx->was_continue)
|
||
add_part (ctx, "/", 1);
|
||
add_part (ctx, (char *) &entry->data[pos + 2],
|
||
entry->data[pos + 1]);
|
||
ctx->was_continue = (entry->data[pos] & 1);
|
||
break;
|
||
}
|
||
|
||
case 2:
|
||
add_part (ctx, "./", 2);
|
||
break;
|
||
|
||
case 4:
|
||
add_part (ctx, "../", 3);
|
||
break;
|
||
|
||
case 8:
|
||
add_part (ctx, "/", 1);
|
||
break;
|
||
}
|
||
/* In pos + 1 the length of the `Component Record' is
|
||
stored. */
|
||
pos += entry->data[pos + 1] + 2;
|
||
}
|
||
|
||
/* Check if `grub_realloc' failed. */
|
||
if (grub_errno)
|
||
return grub_errno;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
grub_iso9660_iterate_dir (grub_fshelp_node_t dir,
|
||
grub_fshelp_iterate_dir_hook_t hook, void *hook_data)
|
||
{
|
||
struct grub_iso9660_dir dirent;
|
||
grub_off_t offset = 0;
|
||
grub_off_t len;
|
||
struct iterate_dir_ctx ctx;
|
||
|
||
len = get_node_size (dir);
|
||
|
||
for (; offset < len; offset += dirent.len)
|
||
{
|
||
ctx.symlink = 0;
|
||
ctx.was_continue = 0;
|
||
|
||
if (read_node (dir, offset, sizeof (dirent), (char *) &dirent))
|
||
return 0;
|
||
|
||
if ((dirent.flags & FLAG_TYPE) != FLAG_TYPE_DIR) {
|
||
g_ventoy_last_read_dirent_pos = g_ventoy_last_read_pos;
|
||
g_ventoy_last_read_dirent_offset = g_ventoy_last_read_offset;
|
||
}
|
||
|
||
/* The end of the block, skip to the next one. */
|
||
if (!dirent.len)
|
||
{
|
||
offset = (offset / GRUB_ISO9660_BLKSZ + 1) * GRUB_ISO9660_BLKSZ;
|
||
continue;
|
||
}
|
||
|
||
{
|
||
char name[MAX_NAMELEN + 1];
|
||
int nameoffset = offset + sizeof (dirent);
|
||
struct grub_fshelp_node *node;
|
||
int sua_off = (sizeof (dirent) + dirent.namelen + 1
|
||
- (dirent.namelen % 2));
|
||
int sua_size = dirent.len - sua_off;
|
||
|
||
sua_off += offset + dir->data->susp_skip;
|
||
|
||
ctx.filename = 0;
|
||
ctx.filename_alloc = 0;
|
||
ctx.type = GRUB_FSHELP_UNKNOWN;
|
||
|
||
if (dir->data->rockridge
|
||
&& grub_iso9660_susp_iterate (dir, sua_off, sua_size,
|
||
susp_iterate_dir, &ctx))
|
||
return 0;
|
||
|
||
/* Read the name. */
|
||
if (read_node (dir, nameoffset, dirent.namelen, (char *) name))
|
||
return 0;
|
||
|
||
node = grub_malloc (sizeof (struct grub_fshelp_node));
|
||
if (!node)
|
||
return 0;
|
||
|
||
node->alloc_dirents = ARRAY_SIZE (node->dirents);
|
||
node->have_dirents = 1;
|
||
|
||
/* Setup a new node. */
|
||
node->data = dir->data;
|
||
node->have_symlink = 0;
|
||
|
||
/* If the filetype was not stored using rockridge, use
|
||
whatever is stored in the iso9660 filesystem. */
|
||
if (ctx.type == GRUB_FSHELP_UNKNOWN)
|
||
{
|
||
if ((dirent.flags & FLAG_TYPE) == FLAG_TYPE_DIR)
|
||
ctx.type = GRUB_FSHELP_DIR;
|
||
else
|
||
ctx.type = GRUB_FSHELP_REG;
|
||
}
|
||
|
||
/* . and .. */
|
||
if (!ctx.filename && dirent.namelen == 1 && name[0] == 0)
|
||
ctx.filename = (char *) ".";
|
||
|
||
if (!ctx.filename && dirent.namelen == 1 && name[0] == 1)
|
||
ctx.filename = (char *) "..";
|
||
|
||
/* The filename was not stored in a rock ridge entry. Read it
|
||
from the iso9660 filesystem. */
|
||
if (!dir->data->joliet && !ctx.filename)
|
||
{
|
||
char *ptr;
|
||
name[dirent.namelen] = '\0';
|
||
ctx.filename = grub_strrchr (name, ';');
|
||
if (ctx.filename)
|
||
*ctx.filename = '\0';
|
||
/* ISO9660 names are not case-preserving. */
|
||
ctx.type |= GRUB_FSHELP_CASE_INSENSITIVE;
|
||
for (ptr = name; *ptr; ptr++)
|
||
*ptr = grub_tolower (*ptr);
|
||
if (ptr != name && *(ptr - 1) == '.')
|
||
*(ptr - 1) = 0;
|
||
ctx.filename = name;
|
||
}
|
||
|
||
if (dir->data->joliet && !ctx.filename)
|
||
{
|
||
char *semicolon;
|
||
|
||
ctx.filename = grub_iso9660_convert_string
|
||
((grub_uint8_t *) name, dirent.namelen >> 1);
|
||
|
||
semicolon = grub_strrchr (ctx.filename, ';');
|
||
if (semicolon)
|
||
*semicolon = '\0';
|
||
|
||
ctx.filename_alloc = 1;
|
||
}
|
||
|
||
node->dirents[0] = dirent;
|
||
while (dirent.flags & FLAG_MORE_EXTENTS)
|
||
{
|
||
offset += dirent.len;
|
||
if (read_node (dir, offset, sizeof (dirent), (char *) &dirent))
|
||
{
|
||
if (ctx.filename_alloc)
|
||
grub_free (ctx.filename);
|
||
grub_free (node);
|
||
return 0;
|
||
}
|
||
if (node->have_dirents >= node->alloc_dirents)
|
||
{
|
||
struct grub_fshelp_node *new_node;
|
||
node->alloc_dirents *= 2;
|
||
new_node = grub_realloc (node,
|
||
sizeof (struct grub_fshelp_node)
|
||
+ ((node->alloc_dirents
|
||
- ARRAY_SIZE (node->dirents))
|
||
* sizeof (node->dirents[0])));
|
||
if (!new_node)
|
||
{
|
||
if (ctx.filename_alloc)
|
||
grub_free (ctx.filename);
|
||
grub_free (node);
|
||
return 0;
|
||
}
|
||
node = new_node;
|
||
}
|
||
node->dirents[node->have_dirents++] = dirent;
|
||
}
|
||
if (ctx.symlink)
|
||
{
|
||
if ((node->alloc_dirents - node->have_dirents)
|
||
* sizeof (node->dirents[0]) < grub_strlen (ctx.symlink) + 1)
|
||
{
|
||
struct grub_fshelp_node *new_node;
|
||
new_node = grub_realloc (node,
|
||
sizeof (struct grub_fshelp_node)
|
||
+ ((node->alloc_dirents
|
||
- ARRAY_SIZE (node->dirents))
|
||
* sizeof (node->dirents[0]))
|
||
+ grub_strlen (ctx.symlink) + 1);
|
||
if (!new_node)
|
||
{
|
||
if (ctx.filename_alloc)
|
||
grub_free (ctx.filename);
|
||
grub_free (node);
|
||
return 0;
|
||
}
|
||
node = new_node;
|
||
}
|
||
node->have_symlink = 1;
|
||
grub_strcpy (node->symlink
|
||
+ node->have_dirents * sizeof (node->dirents[0])
|
||
- sizeof (node->dirents), ctx.symlink);
|
||
grub_free (ctx.symlink);
|
||
ctx.symlink = 0;
|
||
ctx.was_continue = 0;
|
||
}
|
||
if (hook (ctx.filename, ctx.type, node, hook_data))
|
||
{
|
||
g_ventoy_last_file_dirent_pos = g_ventoy_last_read_dirent_pos;
|
||
g_ventoy_last_file_dirent_offset = g_ventoy_last_read_dirent_offset;
|
||
if (ctx.filename_alloc)
|
||
grub_free (ctx.filename);
|
||
return 1;
|
||
}
|
||
if (ctx.filename_alloc)
|
||
grub_free (ctx.filename);
|
||
}
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
|
||
/* Context for grub_iso9660_dir. */
|
||
struct grub_iso9660_dir_ctx
|
||
{
|
||
grub_fs_dir_hook_t hook;
|
||
void *hook_data;
|
||
};
|
||
|
||
/* Helper for grub_iso9660_dir. */
|
||
static int
|
||
grub_iso9660_dir_iter (const char *filename,
|
||
enum grub_fshelp_filetype filetype,
|
||
grub_fshelp_node_t node, void *data)
|
||
{
|
||
struct grub_iso9660_dir_ctx *ctx = data;
|
||
struct grub_dirhook_info info;
|
||
|
||
grub_memset (&info, 0, sizeof (info));
|
||
info.dir = ((filetype & GRUB_FSHELP_TYPE_MASK) == GRUB_FSHELP_DIR);
|
||
info.mtimeset = !!iso9660_to_unixtime2 (&node->dirents[0].mtime, &info.mtime);
|
||
|
||
grub_free (node);
|
||
return ctx->hook (filename, &info, ctx->hook_data);
|
||
}
|
||
|
||
static grub_err_t
|
||
grub_iso9660_dir (grub_device_t device, const char *path,
|
||
grub_fs_dir_hook_t hook, void *hook_data)
|
||
{
|
||
struct grub_iso9660_dir_ctx ctx = { hook, hook_data };
|
||
struct grub_iso9660_data *data = 0;
|
||
struct grub_fshelp_node rootnode;
|
||
struct grub_fshelp_node *foundnode;
|
||
|
||
grub_dl_ref (my_mod);
|
||
|
||
data = grub_iso9660_mount (device->disk);
|
||
if (! data)
|
||
goto fail;
|
||
|
||
rootnode.data = data;
|
||
rootnode.alloc_dirents = 0;
|
||
rootnode.have_dirents = 1;
|
||
rootnode.have_symlink = 0;
|
||
rootnode.dirents[0] = data->voldesc.rootdir;
|
||
|
||
/* Use the fshelp function to traverse the path. */
|
||
if (grub_fshelp_find_file (path, &rootnode,
|
||
&foundnode,
|
||
grub_iso9660_iterate_dir,
|
||
grub_iso9660_read_symlink,
|
||
GRUB_FSHELP_DIR))
|
||
goto fail;
|
||
|
||
/* List the files in the directory. */
|
||
grub_iso9660_iterate_dir (foundnode, grub_iso9660_dir_iter, &ctx);
|
||
|
||
if (foundnode != &rootnode)
|
||
grub_free (foundnode);
|
||
|
||
fail:
|
||
grub_free (data);
|
||
|
||
grub_dl_unref (my_mod);
|
||
|
||
return grub_errno;
|
||
}
|
||
|
||
|
||
/* Open a file named NAME and initialize FILE. */
|
||
static grub_err_t
|
||
grub_iso9660_open (struct grub_file *file, const char *name)
|
||
{
|
||
struct grub_iso9660_data *data;
|
||
struct grub_fshelp_node rootnode;
|
||
struct grub_fshelp_node *foundnode;
|
||
|
||
grub_dl_ref (my_mod);
|
||
|
||
data = grub_iso9660_mount (file->device->disk);
|
||
if (!data)
|
||
goto fail;
|
||
|
||
rootnode.data = data;
|
||
rootnode.alloc_dirents = 0;
|
||
rootnode.have_dirents = 1;
|
||
rootnode.have_symlink = 0;
|
||
rootnode.dirents[0] = data->voldesc.rootdir;
|
||
|
||
/* Use the fshelp function to traverse the path. */
|
||
if (grub_fshelp_find_file (name, &rootnode,
|
||
&foundnode,
|
||
grub_iso9660_iterate_dir,
|
||
grub_iso9660_read_symlink,
|
||
GRUB_FSHELP_REG))
|
||
goto fail;
|
||
|
||
data->node = foundnode;
|
||
file->data = data;
|
||
file->size = get_node_size (foundnode);
|
||
file->offset = 0;
|
||
|
||
return 0;
|
||
|
||
fail:
|
||
grub_dl_unref (my_mod);
|
||
|
||
grub_free (data);
|
||
|
||
return grub_errno;
|
||
}
|
||
|
||
|
||
static grub_ssize_t
|
||
grub_iso9660_read (grub_file_t file, char *buf, grub_size_t len)
|
||
{
|
||
struct grub_iso9660_data *data =
|
||
(struct grub_iso9660_data *) file->data;
|
||
grub_err_t err;
|
||
|
||
/* XXX: The file is stored in as a single extent. */
|
||
data->disk->read_hook = file->read_hook;
|
||
data->disk->read_hook_data = file->read_hook_data;
|
||
err = read_node (data->node, file->offset, len, buf);
|
||
data->disk->read_hook = NULL;
|
||
|
||
if (err || grub_errno)
|
||
return -1;
|
||
|
||
return len;
|
||
}
|
||
|
||
|
||
static grub_err_t
|
||
grub_iso9660_close (grub_file_t file)
|
||
{
|
||
struct grub_iso9660_data *data =
|
||
(struct grub_iso9660_data *) file->data;
|
||
grub_free (data->node);
|
||
grub_free (data);
|
||
|
||
grub_dl_unref (my_mod);
|
||
|
||
return GRUB_ERR_NONE;
|
||
}
|
||
|
||
|
||
static grub_err_t
|
||
grub_iso9660_label (grub_device_t device, char **label)
|
||
{
|
||
struct grub_iso9660_data *data;
|
||
data = grub_iso9660_mount (device->disk);
|
||
|
||
if (data)
|
||
{
|
||
if (data->joliet)
|
||
*label = grub_iso9660_convert_string (data->voldesc.volname, 16);
|
||
else
|
||
*label = grub_strndup ((char *) data->voldesc.volname, 32);
|
||
if (*label)
|
||
{
|
||
char *ptr;
|
||
for (ptr = *label; *ptr;ptr++);
|
||
ptr--;
|
||
while (ptr >= *label && *ptr == ' ')
|
||
*ptr-- = 0;
|
||
}
|
||
|
||
grub_free (data);
|
||
}
|
||
else
|
||
*label = 0;
|
||
|
||
return grub_errno;
|
||
}
|
||
|
||
|
||
static grub_err_t
|
||
grub_iso9660_uuid (grub_device_t device, char **uuid)
|
||
{
|
||
struct grub_iso9660_data *data;
|
||
grub_disk_t disk = device->disk;
|
||
|
||
grub_dl_ref (my_mod);
|
||
|
||
data = grub_iso9660_mount (disk);
|
||
if (data)
|
||
{
|
||
if (! data->voldesc.modified.year[0] && ! data->voldesc.modified.year[1]
|
||
&& ! data->voldesc.modified.year[2] && ! data->voldesc.modified.year[3]
|
||
&& ! data->voldesc.modified.month[0] && ! data->voldesc.modified.month[1]
|
||
&& ! data->voldesc.modified.day[0] && ! data->voldesc.modified.day[1]
|
||
&& ! data->voldesc.modified.hour[0] && ! data->voldesc.modified.hour[1]
|
||
&& ! data->voldesc.modified.minute[0] && ! data->voldesc.modified.minute[1]
|
||
&& ! data->voldesc.modified.second[0] && ! data->voldesc.modified.second[1]
|
||
&& ! data->voldesc.modified.hundredth[0] && ! data->voldesc.modified.hundredth[1])
|
||
{
|
||
grub_error (GRUB_ERR_BAD_NUMBER, "no creation date in filesystem to generate UUID");
|
||
*uuid = NULL;
|
||
}
|
||
else
|
||
{
|
||
*uuid = grub_xasprintf ("%c%c%c%c-%c%c-%c%c-%c%c-%c%c-%c%c-%c%c",
|
||
data->voldesc.modified.year[0],
|
||
data->voldesc.modified.year[1],
|
||
data->voldesc.modified.year[2],
|
||
data->voldesc.modified.year[3],
|
||
data->voldesc.modified.month[0],
|
||
data->voldesc.modified.month[1],
|
||
data->voldesc.modified.day[0],
|
||
data->voldesc.modified.day[1],
|
||
data->voldesc.modified.hour[0],
|
||
data->voldesc.modified.hour[1],
|
||
data->voldesc.modified.minute[0],
|
||
data->voldesc.modified.minute[1],
|
||
data->voldesc.modified.second[0],
|
||
data->voldesc.modified.second[1],
|
||
data->voldesc.modified.hundredth[0],
|
||
data->voldesc.modified.hundredth[1]);
|
||
}
|
||
}
|
||
else
|
||
*uuid = NULL;
|
||
|
||
grub_dl_unref (my_mod);
|
||
|
||
grub_free (data);
|
||
|
||
return grub_errno;
|
||
}
|
||
|
||
/* Get writing time of filesystem. */
|
||
static grub_err_t
|
||
grub_iso9660_mtime (grub_device_t device, grub_int32_t *timebuf)
|
||
{
|
||
struct grub_iso9660_data *data;
|
||
grub_disk_t disk = device->disk;
|
||
grub_err_t err;
|
||
|
||
grub_dl_ref (my_mod);
|
||
|
||
data = grub_iso9660_mount (disk);
|
||
if (!data)
|
||
{
|
||
grub_dl_unref (my_mod);
|
||
return grub_errno;
|
||
}
|
||
err = iso9660_to_unixtime (&data->voldesc.modified, timebuf);
|
||
|
||
grub_dl_unref (my_mod);
|
||
|
||
grub_free (data);
|
||
|
||
return err;
|
||
}
|
||
|
||
grub_uint64_t grub_iso9660_get_last_read_pos(grub_file_t file)
|
||
{
|
||
(void)file;
|
||
return (g_ventoy_last_read_pos << GRUB_DISK_SECTOR_BITS);
|
||
}
|
||
|
||
grub_uint64_t grub_iso9660_get_last_file_dirent_pos(grub_file_t file)
|
||
{
|
||
(void)file;
|
||
return (g_ventoy_last_file_dirent_pos << GRUB_DISK_SECTOR_BITS) + g_ventoy_last_file_dirent_offset;
|
||
}
|
||
|
||
static struct grub_fs grub_iso9660_fs =
|
||
{
|
||
.name = "iso9660",
|
||
.fs_dir = grub_iso9660_dir,
|
||
.fs_open = grub_iso9660_open,
|
||
.fs_read = grub_iso9660_read,
|
||
.fs_close = grub_iso9660_close,
|
||
.fs_label = grub_iso9660_label,
|
||
.fs_uuid = grub_iso9660_uuid,
|
||
.fs_mtime = grub_iso9660_mtime,
|
||
#ifdef GRUB_UTIL
|
||
.reserved_first_sector = 1,
|
||
.blocklist_install = 1,
|
||
#endif
|
||
.next = 0
|
||
};
|
||
|
||
GRUB_MOD_INIT(iso9660)
|
||
{
|
||
grub_fs_register (&grub_iso9660_fs);
|
||
my_mod = mod;
|
||
}
|
||
|
||
GRUB_MOD_FINI(iso9660)
|
||
{
|
||
grub_fs_unregister (&grub_iso9660_fs);
|
||
}
|