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A FAT12 dump script that got left behing in some old master branch (was used in #1793)

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Damjan Adamic 2015-11-22 16:35:48 +01:00
parent 18e36657f8
commit edab80e6af
1 changed files with 52 additions and 0 deletions
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radio/util/fat12decode.py Executable file
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
To dump FAT and prepare input for this program, one can use command like this:
# dd if=/dev/sde skip=1 count=1 | hexdump -v -e '/1 "%02X "' | tr -d ' '
Stock FAT is this:
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
"""
import sys
import os
def displayCluster(cluster, hexfat):
decfat = int(hexfat, 16)
next = ""
if decfat == 0:
next = "-"
elif decfat == 1:
next = "invalid"
elif decfat <= 0xfef : # 002-fef: cluster in use
next = "next %03d" % decfat
elif decfat <= 0xff6: # reserved,
next = "reserved (0x%03x)" % decfat
elif decfat == 0xff7: #bad cluster
next = "bad"
elif decfat <= 0xfff: # cluster in use, the last one in this file
next = "last in this file (0x%03x)" % decfat
print "cluster %03d: %s" % (cluster, next)
data = sys.argv[1]
cluster = 0
while len(data) > 0:
twofats = data[0:6]
fat1 = twofats[3] + twofats[0:2]
fat2 = twofats[4:6] + twofats[2]
# print "fat1 %s, fat2 %s" % (fat1, fat2)
data = data[len(twofats):]
displayCluster(cluster, fat1)
displayCluster(cluster+1, fat2)
# print "cluster %03d: next %03d" % (cluster, int(fat1, 16))
# print "cluster %03d: next %03d" % (cluster+1, int(fat2, 16))
cluster = cluster + 2