diff options
Diffstat (limited to 'src/include/fs/fat.h')
| -rw-r--r-- | src/include/fs/fat.h | 42 |
1 files changed, 22 insertions, 20 deletions
diff --git a/src/include/fs/fat.h b/src/include/fs/fat.h index 7fed6bacb3..d445ce84b1 100644 --- a/src/include/fs/fat.h +++ b/src/include/fs/fat.h @@ -42,25 +42,27 @@ struct fat_bpb { __u8 reserved_sects[2]; /* reserved sectors */ __u8 num_fats; /* number of FATs */ __u8 dir_entries[2]; /* root directory entries */ - __u8 short_sectors[2]; /* number of sectors */ + __u8 short_sectors[2];/* number of sectors */ __u8 media; /* media code (unused) */ - __u16 fat_length; /* sectors/FAT */ - __u16 secs_track; /* sectors per track */ - __u16 heads; /* number of heads */ - __u32 hidden; /* hidden sectors (unused) */ - __u32 long_sectors; /* number of sectors (if short_sectors == 0) */ + __u8 fat_length[2]; /* sectors/FAT */ + __u8 secs_track[2]; /* sectors per track */ + __u8 heads[2]; /* number of heads */ + __u8 hidden[2]; /* hidden sectors (unused) */ + __u8 long_sectors[2];/* number of sectors (if short_sectors == 0) */ /* The following fields are only used by FAT32 */ - __u32 fat32_length; /* sectors/FAT */ - __u16 flags; /* bit 8: fat mirroring, low 4: active fat */ + __u8 fat32_length[2];/* sectors/FAT */ + __u8 flags[2]; /* bit 8: fat mirroring, low 4: active fat */ __u8 version[2]; /* major, minor filesystem version */ - __u32 root_cluster; /* first cluster in root directory */ - __u16 info_sector; /* filesystem info sector */ - __u16 backup_boot; /* backup boot sector */ - __u16 reserved2[6]; /* Unused */ + __u8 root_cluster[4];/* first cluster in root directory */ + __u8 info_sector[2]; /* filesystem info sector */ + __u8 backup_boot[2]; /* backup boot sector */ + __u8 reserved2[12]; /* Unused */ }; -#define FAT_CVT_U16(bytarr) (* (__u16*)(bytarr)) +#define FAT_CVT_U8(byte) (* (__u8*)(byte)) +#define FAT_CVT_U16(bytarr) le16_to_cpu(* (__u16*)(bytarr)) +#define FAT_CVT_U32(bytarr) le32_to_cpu(* (__u32*)(bytarr)) /* * Defines how to differentiate a 12-bit and 16-bit FAT. @@ -84,17 +86,17 @@ struct fat_bpb { #define FAT_DIRENTRY_LENGTH 32 #define FAT_DIRENTRY_ATTRIB(entry) \ - (*((unsigned char *) (entry+11))) + FAT_CVT_U8(entry+11) #define FAT_DIRENTRY_VALID(entry) \ - ( ((*((unsigned char *) entry)) != 0) \ - && ((*((unsigned char *) entry)) != 0xE5) \ + ( (FAT_CVT_U8(entry) != 0) \ + && (FAT_CVT_U8(entry) != 0xE5) \ && !(FAT_DIRENTRY_ATTRIB(entry) & FAT_ATTRIB_NOT_OK_MASK) ) #define FAT_DIRENTRY_FIRST_CLUSTER(entry) \ - ((*((unsigned short *) (entry+26)))+(*((unsigned short *) (entry+20)) << 16)) + (FAT_CVT_U16(entry+26)+(FAT_CVT_U16(entry+20) << 16)) #define FAT_DIRENTRY_FILELENGTH(entry) \ - (*((unsigned long *) (entry+28))) + FAT_CVT_U32(entry+28) #define FAT_LONGDIR_ID(entry) \ - (*((unsigned char *) (entry))) + FAT_CVT_U8(entry) #define FAT_LONGDIR_ALIASCHECKSUM(entry) \ - (*((unsigned char *) (entry+13))) + FAT_CVT_U8(entry+13) |