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#!/usr/bin/env python2
# Copyright (c) 2014 Google Inc. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import struct
import sys
from io import SEEK_SET, SEEK_END
class IDBTool:
def __init__(self):
print "Initialize IDBTool"
def p_rc4(self, buf, length):
key = (124,78,3,4,85,5,9,7,45,44,123,56,23,13,23,17)
K = key * 16
S = [i for i in range(256)]
j = 0
for i in range(256):
j = (j + S[i] + K[i]) % 256
temp = S[i]; S[i] = S[j]; S[j] = temp;
i = j = k = 0
for x in range(length):
i = (i+1) % 256
j = (j + S[i]) % 256
temp = S[i]; S[i] = S[j]; S[j] = temp
k = (S[i] + S[j]) % 256
buf[x] = struct.pack('B', ord(buf[x]) ^ S[k])
def makeIDB(self, chip, from_file, to_file, rc4_flag = False, align_flag = False):
try:
fin = open(from_file, 'rb')
except:
sys.exit("Failed to open file : " + from_file)
try:
fin.seek(0, SEEK_END)
if (fin.tell() > 4 * 1024 * 1024):
sys.exit("Input file is more than 4MB")
fin.seek(0)
data = fin.read()
finally:
fin.close()
data_len = len(data)
SECTOR_SIZE = 512
PAGE_ALIGN = 4
sectors = (data_len + 4 - 1) / SECTOR_SIZE + 1
pages = (sectors - 1) / PAGE_ALIGN + 1
sectors = pages * PAGE_ALIGN;
buf = [B'\0'] * sectors * SECTOR_SIZE
buf[:4] = chip
buf[4 : 4+data_len] = data
idblock = [B'\0'] * 4 * SECTOR_SIZE
blank = [B'\0'] * 4 * SECTOR_SIZE
idblock[:4] = ['\x55', '\xAA', '\xF0', '\x0F']
if (not rc4_flag):
idblock[8:12] = struct.pack("<I", 1)
else:
for i in range(sectors):
list_tmp = buf[SECTOR_SIZE*i : SECTOR_SIZE*(i+1)]
self.p_rc4(list_tmp, SECTOR_SIZE)
buf[SECTOR_SIZE*i : SECTOR_SIZE*(i+1)] = list_tmp
idblock[12:16] = struct.pack("<HH", 4, 4);
idblock[506:510] = struct.pack("<HH", sectors, sectors);
self.p_rc4(idblock, SECTOR_SIZE)
try:
fout = open(to_file, "wb+")
except:
sys.exit("Failed to open output file : " + to_file)
try:
if (align_flag):
fout.write(''.join(idblock))
fout.write(''.join(blank))
for s in xrange(0, sectors * SECTOR_SIZE, PAGE_ALIGN * SECTOR_SIZE):
fout.write(''.join(buf[s : s + PAGE_ALIGN * SECTOR_SIZE]))
fout.write(''.join(blank))
else:
fout.write(''.join(idblock))
fout.write(''.join(buf))
fout.flush()
except:
sys.exit("Failed to write data to : " + to_file)
finally:
fout.close()
print "DONE"
def usage():
print "Usage: make_idb.py [--chip=RKXX] [--enable-rc4] [--enable-align] [--to=out] --from=in"
print " --chip: default is RK32"
if __name__ == '__main__':
rc4_flag = align_flag = False
to_file = "IDBlock.bin"
chip = "RK32"
for para in sys.argv[1:]:
if (para == "--enable-rc4"):
rc4_flag = True
elif (para == "--enable-align"):
align_flag = True
elif (para.startswith("--to=")):
to_file = para.split('=')[1]
elif (para.startswith("--from=")):
from_file = para.split('=')[1]
elif (para.startswith("--chip=")):
chip = para.split('=')[1]
elif (para == "--help" or para == "-h"):
usage()
sys.exit()
else:
usage()
sys.exit()
if ('from_file' not in vars() or to_file == ''):
usage()
sys.exit()
idbtool = IDBTool()
idbtool.makeIDB(chip, from_file, to_file, rc4_flag, align_flag)
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