filesystems

UNIX下FILE命令的实现源码

#------------------------------------------------------------------------------
# filesystems:  file(1) magic for different filesystems
#
0	string	\366\366\366\366	PC formatted floppy with no filesystem
# Sun disk labels
# From /usr/include/sun/dklabel.h:
0774	beshort		0xdabe		Sun disk label
>0	string		x		'%s
>>31  	string		>\0		\b%s
>>>63  	string		>\0		\b%s
>>>>95 	string		>\0		\b%s
>0	string		x		\b'
>0734	short		>0		%d rpm,
>0736	short		>0		%d phys cys,
>0740	short		>0		%d alts/cyl,
>0746	short		>0		%d interleave,
>0750	short		>0		%d data cyls,
>0752	short		>0		%d alt cyls,
>0754	short		>0		%d heads/partition,
>0756	short		>0		%d sectors/track,
>0764	long		>0		start cyl %ld,
>0770	long		x		%ld blocks
# Is there a boot block written 1 sector in?
>512    belong&077777777	0600407	\b, boot block present
0x1FE	leshort	0xAA55			x86 boot sector
>2	string	OSBS			\b, OS/BS MBR
>0x8C	string	Invalid\ partition\ table	\b, MS-DOS MBR
>0	string	\0\0\0\0		\b, extended partition table
>0	leshort 0x3CEB			\b, system
>>3	string	>\0			%s
>>0x36	string	FAT			\b, %s
>>>0x39	string	12			(%s bit)
>>>0x39	string	16			(%s bit)
>0x52	string	FAT32			\b, FAT (32 bit)
>>>43	string		>NO\ NAME	label: %.11s,
>>>43	string		<NO\ NAME	label: %.11s,
>>>43	string		NO\ NAME	unlabeled,
>>>19	leshort		>0		%d sectors
>>>19	leshort		0		
>>>>32	lelong		x		%d sectors
>0x200	lelong	0x82564557		\b, BSD disklabel

# Minix filesystems - Juan Cespedes <[e-mail]>
0x410	leshort		0x137f		Minix filesystem
0x410	leshort		0x138f		Minix filesystem, 30 char names
0x410	leshort		0x2468		Minix filesystem, version 2
0x410	leshort		0x2478		Minix filesystem, version 2, 30 char names

# romfs filesystems - Juan Cespedes <[e-mail]>
0	string		-rom1fs-\0	romfs filesystem, version 1
>8	belong	x			%d bytes,
>16	string	x			named %s.

# netboot image - Juan Cespedes <[e-mail]>
0	lelong		0x1b031336L	Netboot image,
>4	lelong&0xFFFFFF00	0
>>4	lelong&0x100	0x000		mode 2
>>4	lelong&0x100	0x100		mode 3
>4	lelong&0xFFFFFF00	!0	unknown mode

0x18b	string	OS/2	OS/2 Boot Manager

9564	lelong		0x00011954	Unix Fast File system,
>8404	string		x		last mounted on %s,
>9504	ledate		x		last checkd at %s,
>8224	ledate		x		last writen at %s,
>8228	lelong		x		number of blocks %d,
>8232	lelong		x		number of data blocks %d,
>8236	lelong		x		number of cylinder groups %d,
>8240	lelong		x		number of basic blocks %d,
>8244	lelong		x		number of fragment blocks %d,
>8248	lelong		x		minimum percentage of free blocks %d,
>8252	lelong		x		rotational delay %dms,
>8256	lelong		x		disk rotational speed %drps,
>8320	lelong		0		TIME optimization
>8320	lelong		1		SPACE optimization

# ext2/ext3 filesystems - Andreas Dilger <[e-mail]>
0x438	leshort		0xEF53		Linux
>0x44c	lelong		x		rev %d
>0x43e	leshort		x		\b.%d
>0x45c	lelong		^0x0000004	ext2 filesystem data
>>0x43a	leshort		^0x0000001	(mounted or unclean)
>0x45c	lelong		&0x0000004	ext3 filesystem data
>>0x460	lelong		&0x0000004	(needs journal recovery)
>0x43a	leshort		&0x0000002	(errors)
>0x460	lelong		&0x0000001	(compressed)
#>0x460	lelong		&0x0000002	(filetype)
#>0x464	lelong		&0x0000001	(sparse_super)
>0x464	lelong		&0x0000002	(large files)