mirror of
https://github.com/eledio-devices/thirdparty-littlefs.git
synced 2025-10-31 08:42:40 +01:00
21217d75ad
This was a pretty simple oversight on my part. Conceptually, there's no
difference between lfs_fs_getattr and lfs_getattr("/"). Any operations
on directories can be applied "globally" by referring to the root
directory.
Implementation wise, this actually fixes the "corner case" of storing
attributes on the root directory, which is broken since the root
directory doesn't have a related entry. Instead we need to use the root
superblock for this purpose.
Fewer functions means less code to document and maintain, so this is a
nice benefit. Now we just have a single lfs_getattr/setattr/removeattr set
of functions along with the ability to access attributes atomically in
lfs_file_opencfg.
105 lines
2.7 KiB
Python
Executable File
105 lines
2.7 KiB
Python
Executable File
#!/usr/bin/env python2
|
|
|
|
import struct
|
|
import binascii
|
|
|
|
TYPES = {
|
|
(0x1ff, 0x001): 'reg',
|
|
(0x1ff, 0x002): 'dir',
|
|
(0x1ff, 0x011): 'superblock',
|
|
(0x1ff, 0x010): 'root',
|
|
(0x1ff, 0x030): 'delete',
|
|
(0x1f0, 0x080): 'globals',
|
|
(0x1ff, 0x0c0): 'tail soft',
|
|
(0x1ff, 0x0c1): 'tail hard',
|
|
(0x1ff, 0x0f0): 'crc',
|
|
(0x1ff, 0x040): 'struct dir',
|
|
(0x1ff, 0x041): 'struct inline',
|
|
(0x1ff, 0x042): 'struct ctz',
|
|
(0x100, 0x100): 'attr',
|
|
}
|
|
|
|
def typeof(type):
|
|
for prefix in range(9):
|
|
mask = 0x1ff & ~((1 << prefix)-1)
|
|
if (mask, type & mask) in TYPES:
|
|
return TYPES[mask, type & mask] + (
|
|
' [%0*x]' % (prefix/4, type & ((1 << prefix)-1))
|
|
if prefix else '')
|
|
else:
|
|
return '[%02x]' % type
|
|
|
|
def main(*blocks):
|
|
# find most recent block
|
|
file = None
|
|
rev = None
|
|
crc = None
|
|
versions = []
|
|
|
|
for block in blocks:
|
|
try:
|
|
nfile = open(block, 'rb')
|
|
ndata = nfile.read(4)
|
|
ncrc = binascii.crc32(ndata)
|
|
nrev, = struct.unpack('<I', ndata)
|
|
|
|
assert rev != nrev
|
|
if not file or ((rev - nrev) & 0x80000000):
|
|
file = nfile
|
|
rev = nrev
|
|
crc = ncrc
|
|
|
|
versions.append((nrev, '%s (rev %d)' % (block, nrev)))
|
|
except (IOError, struct.error):
|
|
pass
|
|
|
|
if not file:
|
|
print 'Bad metadata pair {%s}' % ', '.join(blocks)
|
|
return 1
|
|
|
|
print "--- %s ---" % ', '.join(v for _,v in sorted(versions, reverse=True))
|
|
|
|
# go through each tag, print useful information
|
|
print "%-4s %-8s %-14s %3s %3s %s" % (
|
|
'off', 'tag', 'type', 'id', 'len', 'dump')
|
|
|
|
tag = 0
|
|
off = 4
|
|
while True:
|
|
try:
|
|
data = file.read(4)
|
|
crc = binascii.crc32(data, crc)
|
|
ntag, = struct.unpack('<I', data)
|
|
except struct.error:
|
|
break
|
|
|
|
tag ^= ntag
|
|
off += 4
|
|
|
|
type = (tag & 0x7fc00000) >> 22
|
|
id = (tag & 0x003ff000) >> 12
|
|
size = (tag & 0x00000fff) >> 0
|
|
|
|
data = file.read(size)
|
|
if type == 0x0f0:
|
|
crc = binascii.crc32(data[:4], crc)
|
|
else:
|
|
crc = binascii.crc32(data, crc)
|
|
|
|
print '%04x: %08x %-14s %3s %3d %-23s %-8s' % (
|
|
off, tag,
|
|
typeof(type) + (' bad!' if type == 0x0f0 and ~crc else ''),
|
|
id if id != 0x3ff else '.', size,
|
|
' '.join('%02x' % ord(c) for c in data[:8]),
|
|
''.join(c if c >= ' ' and c <= '~' else '.' for c in data[:8]))
|
|
|
|
off += tag & 0xfff
|
|
if type == 0x0f0:
|
|
crc = 0
|
|
|
|
return 0
|
|
|
|
if __name__ == "__main__":
|
|
import sys
|
|
sys.exit(main(*sys.argv[1:]))
|