diff options
Diffstat (limited to 'libs/blkid/src/probers/vfat.c')
-rw-r--r-- | libs/blkid/src/probers/vfat.c | 364 |
1 files changed, 0 insertions, 364 deletions
diff --git a/libs/blkid/src/probers/vfat.c b/libs/blkid/src/probers/vfat.c deleted file mode 100644 index a83175c0b..000000000 --- a/libs/blkid/src/probers/vfat.c +++ /dev/null @@ -1,364 +0,0 @@ -/* - * Copyright (C) 1999 by Andries Brouwer - * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o - * Copyright (C) 2001 by Andreas Dilger - * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> - * Copyright (C) 2008 Karel Zak <kzak@redhat.com> - * - * This file may be redistributed under the terms of the - * GNU Lesser General Public License. - */ -#include <stdio.h> -#include <stdlib.h> -#include <unistd.h> -#include <string.h> -#include <errno.h> -#include <ctype.h> -#include <stdint.h> - -#include "blkidP.h" - -/* Yucky misaligned values */ -struct vfat_super_block { -/* 00*/ unsigned char vs_ignored[3]; -/* 03*/ unsigned char vs_sysid[8]; -/* 0b*/ unsigned char vs_sector_size[2]; -/* 0d*/ uint8_t vs_cluster_size; -/* 0e*/ uint16_t vs_reserved; -/* 10*/ uint8_t vs_fats; -/* 11*/ unsigned char vs_dir_entries[2]; -/* 13*/ unsigned char vs_sectors[2]; -/* 15*/ unsigned char vs_media; -/* 16*/ uint16_t vs_fat_length; -/* 18*/ uint16_t vs_secs_track; -/* 1a*/ uint16_t vs_heads; -/* 1c*/ uint32_t vs_hidden; -/* 20*/ uint32_t vs_total_sect; -/* 24*/ uint32_t vs_fat32_length; -/* 28*/ uint16_t vs_flags; -/* 2a*/ uint8_t vs_version[2]; -/* 2c*/ uint32_t vs_root_cluster; -/* 30*/ uint16_t vs_fsinfo_sector; -/* 32*/ uint16_t vs_backup_boot; -/* 34*/ uint16_t vs_reserved2[6]; -/* 40*/ unsigned char vs_unknown[3]; -/* 43*/ unsigned char vs_serno[4]; -/* 47*/ unsigned char vs_label[11]; -/* 52*/ unsigned char vs_magic[8]; -/* 5a*/ unsigned char vs_dummy2[164]; -/*1fe*/ unsigned char vs_pmagic[2]; -}; - -/* Yucky misaligned values */ -struct msdos_super_block { -/* 00*/ unsigned char ms_ignored[3]; -/* 03*/ unsigned char ms_sysid[8]; -/* 0b*/ unsigned char ms_sector_size[2]; -/* 0d*/ uint8_t ms_cluster_size; -/* 0e*/ uint16_t ms_reserved; -/* 10*/ uint8_t ms_fats; -/* 11*/ unsigned char ms_dir_entries[2]; -/* 13*/ unsigned char ms_sectors[2]; -/* 15*/ unsigned char ms_media; -/* 16*/ uint16_t ms_fat_length; -/* 18*/ uint16_t ms_secs_track; -/* 1a*/ uint16_t ms_heads; -/* 1c*/ uint32_t ms_hidden; -/* 20*/ uint32_t ms_total_sect; -/* 24*/ unsigned char ms_unknown[3]; -/* 27*/ unsigned char ms_serno[4]; -/* 2b*/ unsigned char ms_label[11]; -/* 36*/ unsigned char ms_magic[8]; -/* 3d*/ unsigned char ms_dummy2[192]; -/*1fe*/ unsigned char ms_pmagic[2]; -}; - -struct vfat_dir_entry { - uint8_t name[11]; - uint8_t attr; - uint16_t time_creat; - uint16_t date_creat; - uint16_t time_acc; - uint16_t date_acc; - uint16_t cluster_high; - uint16_t time_write; - uint16_t date_write; - uint16_t cluster_low; - uint32_t size; -}; - -struct fat32_fsinfo { - uint8_t signature1[4]; - uint32_t reserved1[120]; - uint8_t signature2[4]; - uint32_t free_clusters; - uint32_t next_cluster; - uint32_t reserved2[4]; -}; - -/* maximum number of clusters */ -#define FAT12_MAX 0xFF4 -#define FAT16_MAX 0xFFF4 -#define FAT32_MAX 0x0FFFFFF6 - -#define FAT_ATTR_VOLUME_ID 0x08 -#define FAT_ATTR_DIR 0x10 -#define FAT_ATTR_LONG_NAME 0x0f -#define FAT_ATTR_MASK 0x3f -#define FAT_ENTRY_FREE 0xe5 - -static const char *no_name = "NO NAME "; - -static unsigned char *search_fat_label(struct vfat_dir_entry *dir, int count) -{ - int i; - - for (i = 0; i < count; i++) { - if (dir[i].name[0] == 0x00) - break; - - if ((dir[i].name[0] == FAT_ENTRY_FREE) || - (dir[i].cluster_high != 0 || dir[i].cluster_low != 0) || - ((dir[i].attr & FAT_ATTR_MASK) == FAT_ATTR_LONG_NAME)) - continue; - - if ((dir[i].attr & (FAT_ATTR_VOLUME_ID | FAT_ATTR_DIR)) == - FAT_ATTR_VOLUME_ID) { - return dir[i].name; - } - } - return 0; -} - -/* - * The FAT filesystem could be without a magic string in superblock - * (e.g. old floppies). This heuristic for FAT detection is inspired - * by libvolume_id and the Linux kernel. - */ -static int probe_fat_nomagic(blkid_probe pr, const struct blkid_idmag *mag) -{ - struct msdos_super_block *ms; - - ms = blkid_probe_get_sb(pr, mag, struct msdos_super_block); - if (!ms) - return -1; - - /* heads check */ - if (ms->ms_heads == 0) - return 1; - - /* cluster size check*/ - if (ms->ms_cluster_size == 0 || - (ms->ms_cluster_size & (ms->ms_cluster_size-1))) - return 1; - - /* media check */ - if (ms->ms_media < 0xf8 && ms->ms_media != 0xf0) - return 1; - - /* fat counts(Linux kernel expects at least 1 FAT table) */ - if (!ms->ms_fats) - return 1; - - /* - * OS/2 and apparently DFSee will place a FAT12/16-like - * pseudo-superblock in the first 512 bytes of non-FAT - * filesystems --- at least JFS and HPFS, and possibly others. - * So we explicitly check for those filesystems at the - * FAT12/16 filesystem magic field identifier, and if they are - * present, we rule this out as a FAT filesystem, despite the - * FAT-like pseudo-header. - */ - if ((memcmp(ms->ms_magic, "JFS ", 8) == 0) || - (memcmp(ms->ms_magic, "HPFS ", 8) == 0)) - return 1; - - return 0; -} - -/* FAT label extraction from the root directory taken from Kay - * Sievers's volume_id library */ -static int probe_vfat(blkid_probe pr, const struct blkid_idmag *mag) -{ - struct vfat_super_block *vs; - struct msdos_super_block *ms; - struct vfat_dir_entry *dir; - const unsigned char *vol_label = 0, *tmp; - unsigned char *vol_serno; - int maxloop = 100; - uint16_t sector_size, dir_entries, reserved; - uint32_t sect_count, fat_size, dir_size, cluster_count, fat_length; - uint32_t buf_size, start_data_sect, next, root_start, root_dir_entries; - const char *version = NULL; - - - /* non-standard magic strings */ - if (mag->len <= 2 && probe_fat_nomagic(pr, mag) != 0) - return 1; - - vs = blkid_probe_get_sb(pr, mag, struct vfat_super_block); - if (!vs) - return -1; - - ms = blkid_probe_get_sb(pr, mag, struct msdos_super_block); - if (!ms) - return -1; - - /* sector size check */ - tmp = (unsigned char *) &ms->ms_sector_size; - sector_size = tmp[0] + (tmp[1] << 8); - if (sector_size != 0x200 && sector_size != 0x400 && - sector_size != 0x800 && sector_size != 0x1000) - return 1; - - tmp = (unsigned char *) &ms->ms_dir_entries; - dir_entries = tmp[0] + (tmp[1] << 8); - reserved = le16_to_cpu(ms->ms_reserved); - tmp = (unsigned char *) &ms->ms_sectors; - sect_count = tmp[0] + (tmp[1] << 8); - if (sect_count == 0) - sect_count = le32_to_cpu(ms->ms_total_sect); - - fat_length = le16_to_cpu(ms->ms_fat_length); - if (fat_length == 0) - fat_length = le32_to_cpu(vs->vs_fat32_length); - - fat_size = fat_length * ms->ms_fats; - dir_size = ((dir_entries * sizeof(struct vfat_dir_entry)) + - (sector_size-1)) / sector_size; - - cluster_count = sect_count - (reserved + fat_size + dir_size); - if (ms->ms_cluster_size == 0) - return 1; - cluster_count /= ms->ms_cluster_size; - - if (cluster_count > FAT32_MAX) - return 1; - - if (ms->ms_fat_length) { - /* the label may be an attribute in the root directory */ - root_start = (reserved + fat_size) * sector_size; - root_dir_entries = vs->vs_dir_entries[0] + - (vs->vs_dir_entries[1] << 8); - - buf_size = root_dir_entries * sizeof(struct vfat_dir_entry); - dir = (struct vfat_dir_entry *) - blkid_probe_get_buffer(pr, root_start, buf_size); - if (dir) - vol_label = search_fat_label(dir, root_dir_entries); - - if (!vol_label || !memcmp(vol_label, no_name, 11)) - vol_label = ms->ms_label; - vol_serno = ms->ms_serno; - - blkid_probe_set_value(pr, "SEC_TYPE", (unsigned char *) "msdos", - sizeof("msdos")); - - if (cluster_count < FAT12_MAX) - version = "FAT12"; - else if (cluster_count < FAT16_MAX) - version = "FAT16"; - } else { - unsigned char *buf; - uint16_t fsinfo_sect; - - /* Search the FAT32 root dir for the label attribute */ - buf_size = vs->vs_cluster_size * sector_size; - start_data_sect = reserved + fat_size; - - version = "FAT32"; - - next = le32_to_cpu(vs->vs_root_cluster); - while (next && --maxloop) { - uint32_t next_sect_off; - uint64_t next_off, fat_entry_off; - int count; - - next_sect_off = (next - 2) * vs->vs_cluster_size; - next_off = (start_data_sect + next_sect_off) * - sector_size; - - dir = (struct vfat_dir_entry *) - blkid_probe_get_buffer(pr, next_off, buf_size); - if (dir == NULL) - break; - - count = buf_size / sizeof(struct vfat_dir_entry); - - vol_label = search_fat_label(dir, count); - if (vol_label) - break; - - /* get FAT entry */ - fat_entry_off = (reserved * sector_size) + - (next * sizeof(uint32_t)); - buf = blkid_probe_get_buffer(pr, fat_entry_off, buf_size); - if (buf == NULL) - break; - - /* set next cluster */ - next = le32_to_cpu(*((uint32_t *) buf) & 0x0fffffff); - } - - if (!vol_label || !memcmp(vol_label, no_name, 11)) - vol_label = vs->vs_label; - vol_serno = vs->vs_serno; - - /* - * FAT32 should have a valid signature in the fsinfo block, - * but also allow all bytes set to '\0', because some volumes - * do not set the signature at all. - */ - fsinfo_sect = le16_to_cpu(vs->vs_fsinfo_sector); - if (fsinfo_sect) { - struct fat32_fsinfo *fsinfo; - - buf = blkid_probe_get_buffer(pr, - fsinfo_sect * sector_size, - sizeof(struct fat32_fsinfo)); - if (buf == NULL) - return -1; - - fsinfo = (struct fat32_fsinfo *) buf; - if (memcmp(fsinfo->signature1, "\x52\x52\x61\x41", 4) != 0 && - memcmp(fsinfo->signature1, "\x00\x00\x00\x00", 4) != 0) - return -1; - if (memcmp(fsinfo->signature2, "\x72\x72\x41\x61", 4) != 0 && - memcmp(fsinfo->signature2, "\x00\x00\x00\x00", 4) != 0) - return -1; - } - } - - if (vol_label && memcmp(vol_label, no_name, 11)) - blkid_probe_set_label(pr, (unsigned char *) vol_label, 11); - - /* We can't just print them as %04X, because they are unaligned */ - blkid_probe_sprintf_uuid(pr, vol_serno, 4, "%02X%02X-%02X%02X", - vol_serno[3], vol_serno[2], vol_serno[1], vol_serno[0]); - - if (version) - blkid_probe_set_version(pr, version); - - return 0; -} - - -const struct blkid_idinfo vfat_idinfo = -{ - .name = "vfat", - .usage = BLKID_USAGE_FILESYSTEM, - .probefunc = probe_vfat, - .magics = - { - { .magic = "MSWIN", .len = 5, .sboff = 0x52 }, - { .magic = "FAT32 ", .len = 8, .sboff = 0x52 }, - { .magic = "MSDOS", .len = 5, .sboff = 0x36 }, - { .magic = "FAT16 ", .len = 8, .sboff = 0x36 }, - { .magic = "FAT12 ", .len = 8, .sboff = 0x36 }, - { .magic = "\353", .len = 1, }, - { .magic = "\351", .len = 1, }, - { .magic = "\125\252", .len = 2, .sboff = 0x1fe }, - { NULL } - } -}; 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