-
Notifications
You must be signed in to change notification settings - Fork 43
/
bootimg.py
1262 lines (1090 loc) · 40.3 KB
/
bootimg.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
#!/usr/bin/env python
#fileencoding: utf-8
#Author: Liu DongMiao <[email protected]>
#Created : Sun 17 Oct 2010 11:19:58 AM CST
#Modified : Fri 04 Nov 2016 10:12:42 PM CST
import os
import sys
import mmap
import json
import struct
from stat import *
from hashlib import sha1
latin = lambda x: x.encode('latin')
def write_bootimg(output, kernel, ramdisk, second, dtimg,
name, cmdline, kernel_addr, ramdisk_addr, second_addr, tags_addr, page_size, padding_size, os_version):
''' make C8600-compatible bootimg.
output: file object
kernel, ramdisk, second: file object or string
name, cmdline: string
base, page_size, padding_size: integer size
official document:
https://android.googlesource.com/platform/system/core/+/master/mkbootimg/bootimg.h
Note: padding_size is not equal to page_size in HuaWei C8600
'''
if not isinstance(page_size, int):
page_size = 0x800
if not isinstance(padding_size, int):
padding_size = 0x800
if not hasattr(output, 'write'):
output = sys.stdout
padding = lambda x: struct.pack('%ds' % ((~x + 1) & (padding_size - 1)), latin(''))
def getsize(x):
if x is None:
return 0
assert hasattr(x, 'seek')
assert hasattr(x, 'tell')
x.seek(0, 2)
return x.tell()
def writecontent(output, x):
if x is None:
# sha.update('')
sha.update(struct.pack('<I', 0))
return None
assert hasattr(x, 'read')
x.seek(0, 0)
content = x.read()
sha.update(content)
sha.update(struct.pack('<I', len(content)))
output.write(content)
output.write(padding(x.tell()))
if hasattr(x, 'close'):
x.close()
output.write(struct.pack('<8s10I16s512s', latin('ANDROID!'),
getsize(kernel), kernel_addr,
getsize(ramdisk), ramdisk_addr,
getsize(second), second_addr,
tags_addr, page_size, getsize(dtimg), os_version,
name, cmdline))
idpos = output.tell()
# fill with null first
output.write(struct.pack('32s', latin('')))
output.write(padding(output.tell()))
sha = sha1()
writecontent(output, kernel)
writecontent(output, ramdisk)
writecontent(output, second)
writecontent(output, dtimg)
# fill back sha1
output.seek(idpos, 0)
output.write(sha.digest())
if hasattr('output', 'close'):
output.close()
def parse_bootimg(bootimg):
''' parse C8600-compatible bootimg.
write kernel to kernel[.gz]
write ramdisk to ramdisk[.gz]
write second to second[.gz]
write dtimg to dt.img
write extra to unknown
official document:
https://android.googlesource.com/platform/system/core/+/master/mkbootimg/bootimg.h
Note: padding_size is not equal to page_size in HuaWei C8600
'''
( magic,
kernel_size, kernel_addr,
ramdisk_size, ramdisk_addr,
second_size, second_addr,
tags_addr, page_size, dt_size, os_version,
name, cmdline, id4x8
) = struct.unpack('<8s10I16s512s32s', bootimg.read(608))
bootimg.seek(page_size - 608, 1)
base = kernel_addr - 0x00008000
assert magic.decode('latin') == 'ANDROID!', 'invald bootimg'
# assert base == ramdisk_addr - 0x01000000, 'invalid bootimg'
# assert base == second_addr - 0x00f00000, 'invalid bootimg'
# assert base == tags_addr - 0x00000100, 'invalid bootimg'
def say(v):
b7 = 127
b4 = 15
a = (v >> 25) & b7
b = (v >> 18) & b7
c = (v >> 11) & b7
y = ((v >> 4) & b7) + 2000
m = v & b4
return '%d.%d.%d %s-%s' % (a, b, c, y, m)
sys.stderr.write('kernel_addr=0x%x\n' % kernel_addr)
sys.stderr.write('ramdisk_addr=0x%x\n' % ramdisk_addr)
sys.stderr.write('second_addr=0x%x\n' % second_addr)
sys.stderr.write('tags_addr=0x%x\n' % tags_addr)
# sys.stderr.write('base=0x%x\n' % base)
sys.stderr.write('page_size=%d\n' % page_size)
sys.stderr.write('os_version=0x%08x(%s)\n' % (os_version, say(os_version)))
sys.stderr.write('name="%s"\n' % name.decode('latin').strip('\x00'))
sys.stderr.write('cmdline="%s"\n' % cmdline.decode('latin').strip('\x00'))
while True:
if bootimg.read(page_size) == struct.pack('%ds' % page_size, latin('')):
continue
bootimg.seek(-page_size, 1)
size = bootimg.tell()
break
padding = lambda x: (~x + 1) & (size - 1)
sys.stderr.write('padding_size=%d\n' % size)
metadata = {
'kernel_addr': kernel_addr,
'ramdisk_addr': ramdisk_addr,
'second_addr': second_addr,
'tags_addr': tags_addr,
'page_size': page_size,
'name': name.decode('latin').strip('\x00'),
'cmdline': cmdline.decode('latin').strip('\x00'),
'padding_size': size,
'os_version': os_version,
}
w = open('bootimg.json', 'w')
w.write(json.dumps(metadata))
w.close()
gzname = lambda x: x == struct.pack('3B', 0x1f, 0x8b, 0x08) and '.gz' or ''
kernel = bootimg.read(kernel_size)
output = open('kernel%s' % gzname(kernel[:3]) , 'wb')
magic = struct.pack('>I', 0xd00dfeed)
pos = kernel.find(magic)
if pos > 0:
output.write(kernel[:pos])
kerneldt = open('kernel%s.dt' % gzname(kernel[:3]) , 'wb')
kerneldt.write(kernel[pos:])
kerneldt.close()
else:
output.write(kernel)
output.close()
bootimg.seek(padding(kernel_size), 1)
ramdisk = bootimg.read(ramdisk_size)
output = open('ramdisk%s' % gzname(ramdisk[:3]) , 'wb')
output.write(ramdisk)
output.close()
bootimg.seek(padding(ramdisk_size), 1)
if second_size:
second = bootimg.read(second_size)
output = open('second%s' % gzname(second[:3]) , 'wb')
output.write(second)
output.close()
bootimg.seek(padding(second_size), 1)
if dt_size:
dtimg = bootimg.read(dt_size)
output = open('dt.img', 'wb')
output.write(dtimg)
output.close()
bootimg.seek(padding(dt_size), 1)
unknown = bootimg.read()
if unknown:
output = open('unknown', 'wb')
output.write(unknown)
output.close()
elif os.path.exists('unknown'):
os.unlink('unknown')
bootimg.close()
# CRC CCITT
crc_ccitt_table = []
for crc in range(0, 256):
for x in range(0, 8):
if crc & 0x1:
crc = (crc >> 1) ^ 0x8408
else:
crc >>= 1
crc_ccitt_table.append(crc)
def crc_ccitt(data, crc=0xffff):
for item in data:
crc = (crc >> 8) ^ crc_ccitt_table[crc & 0xff ^ item]
return crc
def get_crc_ccitt(data):
crc = crc_ccitt(data) ^ 0xffff
return struct.pack('<H', crc)
POSITION = {0x30000000: 'boot.img',
0x40000000: 'system.img',
0x50000000: 'userdata.img',
0x60000000: 'recovery.img',
0xf2000000: 'splash.565',}
def parse_updata(updata, debug=False):
''' parse C8600 UPDATA binary.
if debug is true or 1 or yes, write content to [position], else according POSITION
UPDATA.APP Structure (only guess)
magic | 0x55 0xaa 0x5a 0xa5
header_length | unsigned int
tag1 | 0x01 0x00 0x00 0x00
boardname | char[8]
position | unsigned int
content_length | unsigned int
date | char[16] -> YYYY.MM.DD
time | char[16] -> hh.mm.ss
INPUT | char[16] -> INPUT
null | char[16]
crc | crc-ccitt for header (98bit)
tag2 | 0x00 0x10 0x00 0x00
header | crc-ccitt for every 4096 of content
content |
padding | padding to 4 bytes
'''
updatalist = open('updatalist.txt', 'w')
while True:
data = updata.read(4)
if not data:
break
if data == struct.pack('4s', latin('')):
continue
data += updata.read(94)
assert len(data) == 98, 'invalid updata'
( magic,
header_length,
tag1, # \x01\x00\x00\x00
boardname,
position,
content_length,
date,
time,
INPUT,
null,
crc,
tag2, # \x00\x10\x00\x00
) = struct.unpack('<4sI4s8sII16s16s16s16s2s4s', data)
magic, = struct.unpack('!I', magic)
assert magic == 0x55aa5aa5, 'invalid updata %x' % magic
header_header = list(struct.unpack('98B', data))
header_header[-5] = header_header[-6] = 0
assert crc == get_crc_ccitt(header_header)
open('boardname.bin', 'wb').write(boardname)
open('date.txt', 'wb').write(date)
open('time.txt', 'wb').write(time)
padding = (~(header_length + content_length) + 1) & 3
remain = header_length - 98
header = list(struct.unpack('%dB' % remain, updata.read(remain)))
output = open(POSITION.get(position, '0x%x.raw' % position), 'wb')
sys.stderr.write('%s\t0x%x\n' % (output.name, position))
updatalist.write('%s\t0x%x\n' % (output.name, position))
remain = content_length
while remain > 0:
size = remain > 4096 and 4096 or remain
data = updata.read(size)
if debug:
check = list(struct.unpack('%dB' % size, data))
check.append(header.pop(0))
check.append(header.pop(0))
assert crc_ccitt(check) == 0xf0b8
output.write(data)
remain -= size
output.close()
updata.seek(padding, 1)
updata.close()
updatalist.close()
def write_updata(output):
'''
magic | 0x55 0xaa 0x5a 0xa5
header_length | unsigned int
tag1 | 0x01 0x00 0x00 0x00
boardname | char[8]
position | unsigned int
content_length | unsigned int
date | char[16] -> YYYY.MM.DD
time | char[16] -> hh.mm.ss
INPUT | char[16] -> INPUT
null | char[16]
crc | crc-ccitt for header (98bit)
tag2 | 0x00 0x10 0x00 0x00
header | crc-ccitt for every 4096 of content
content |
padding | padding to 4 bytes
'''
from time import strftime
output.write(struct.pack('1s', latin('')) * 92)
updatalist = open('updatalist.txt', 'r')
boardname = open('boardname.bin', 'rb').read()
if os.path.isfile('date.txt'):
date = open('date.txt').read()
else:
date = strftime('%Y.%m.%d')
if os.path.isfile('time.txt'):
time = open('time.txt').read()
else:
time = strftime('%H.%M.%S')
for record in updatalist:
name, position = record.split()[:2]
data = open(name, 'rb')
header = latin('')
content_length = 0
while True:
raw4096 = data.read(4096)
content_length += len(raw4096)
if not raw4096:
break
header += get_crc_ccitt(list(struct.unpack('%dB' % len(raw4096), raw4096)))
header_length = 98
header_length += len(header)
data.close()
header_header = struct.pack('<4sI4s8sII16s16s16s16s2s4s',
latin('\x55\xaa\x5a\xa5'),
header_length,
latin('\x01\x00\x00\x00'),
boardname,
int(position, 16),
content_length,
latin(date),
latin(time),
latin('INPUT'),
latin(''),
latin(''),
latin('\x00\x10\x00\x00'))
crc = get_crc_ccitt(list(struct.unpack('98B', header_header)))
output.write(header_header[:-6])
output.write(crc)
output.write(header_header[-4:])
output.write(header)
data = open(name, 'rb')
output.write(data.read())
data.close()
padding = (~(header_length + content_length) + 1) & 3
output.write(struct.pack('%ds' % padding, latin('')))
output.close()
def cpio_list(directory, output=None):
''' generate gen_cpio_init-compatible list for directory,
if output is None, write to stdout
official document:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=usr/gen_init_cpio.c
'''
if not hasattr(output, 'write'):
output = sys.stdout
for root, dirs, files in os.walk(directory):
for file in dirs + files:
path = os.path.join(root, file)
info = os.lstat(path)
name = path.replace(directory, '', 1)
name = name.replace(os.sep, '/') # for windows
if name[:1] != '/':
name = '/' + name
mode = oct(S_IMODE(info.st_mode))
if S_ISLNK(info.st_mode):
# slink name path mode uid gid
realpath = os.readlink(path)
output.write('slink %s %s %s 0 0\n' % (name, realpath, mode))
elif S_ISDIR(info.st_mode):
# dir name path mode uid gid
output.write('dir %s %s 0 0\n' % (name, mode))
elif S_ISREG(info.st_mode):
# file name path mode uid gid
output.write('file %s %s %s 0 0\n' % (name, path, mode))
if hasattr(output, 'close'):
output.close()
def parse_cpio(cpio, directory, cpiolist):
''' parse cpio, write content under directory.
cpio: file object
directory: string
cpiolist: file object
official document: (cpio newc structure)
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=usr/gen_init_cpio.c
'''
padding = lambda x: (~x + 1) & 3
def read_cpio_header(cpio):
assert cpio.read(6).decode('latin') == '070701', 'invalid cpio'
cpio.read(8) # ignore inode number
mode = int(cpio.read(8), 16)
cpio.read(8) # uid
cpio.read(8) # gid
cpio.read(8) # nlink
cpio.read(8) # timestamp
filesize = int(cpio.read(8), 16)
cpio.read(8) # major
cpio.read(8) # minor
cpio.read(8) # rmajor
cpio.read(8) # rminor
namesize = int(cpio.read(8), 16)
cpio.read(8)
name = cpio.read(namesize - 1).decode('latin') # maybe utf8?
cpio.read(1)
cpio.read(padding(namesize + 110))
return name, mode, filesize
while True:
name, mode, filesize = read_cpio_header(cpio)
if name == 'TRAILER!!!':
break
if name[:1] != '/':
name = '/%s' % name
name = os.path.normpath(name)
path = '%s%s' %(directory, name)
name = name.replace(os.sep, '/') # for windows
srwx = oct(S_IMODE(mode))
if S_ISLNK(mode):
location = cpio.read(filesize)
cpio.read(padding(filesize))
cpiolist.write('slink %s %s %s\n' % (name, location, srwx))
elif S_ISDIR(mode):
try: os.makedirs(path)
except os.error: pass
cpiolist.write('dir %s %s\n' % (name, srwx))
elif S_ISREG(mode):
dirname = os.path.dirname(path)
if not os.path.isdir(dirname):
os.makedirs(dirname)
tmp = open(path, 'wb')
tmp.write(cpio.read(filesize))
cpio.read(padding(filesize))
tmp.close()
cpiolist.write('file %s %s %s\n' % (name, path, srwx))
else:
cpio.read(filesize)
cpio.read(padding(filesize))
cpio.close()
cpiolist.close()
def write_cpio(cpiolist, output):
''' generate cpio from cpiolist.
cpiolist: file object
output: file object
'''
padding = lambda x, y: struct.pack('%ds' % ((~x + 1) & (y - 1)), latin(''))
def write_cpio_header(output, name, mode=0, nlink=1, filesize=0):
namesize = len(name) + 1
output.write(latin('070701'))
output.write(latin('%08x' % 0)) # ino normally only for hardlink
output.write(latin('%08x' % mode))
output.write(latin('%08x%08x' % (0, 0))) # uid, gid set to 0
output.write(latin('%08x' % nlink))
output.write(latin('%08x' % 0)) # timestamp set to 0
output.write(latin('%08x' % filesize))
output.write(latin('%08x%08x' % (3, 1)))
output.write(latin('%08x%08x' % (0, 0))) # dont support rmajor, rminor
output.write(latin('%08x' % namesize))
output.write(latin('%08x' % 0)) # chksum always be 0
output.write(latin(name))
output.write(struct.pack('1s', latin('')))
output.write(padding(namesize + 110, 4))
def cpio_mkfile(output, name, path, mode, *kw):
if os.path.split(name)[1] in ('su', 'busybox'):
mode = '4555'
mode = int(mode, 8) | S_IFREG
filesize = os.path.getsize(path)
write_cpio_header(output, name, mode, 1, filesize)
tmp = open(path, 'rb')
output.write(tmp.read())
tmp.close()
output.write(padding(filesize, 4))
def cpio_mkdir(output, name, mode='755', *kw):
if name == '/tmp':
mode = '1777'
mode = int(mode, 8) | S_IFDIR
write_cpio_header(output, name, mode, 2, 0)
def cpio_mkslink(output, name, path, mode='777', *kw):
mode = int(mode, 8) | S_IFLNK
filesize = len(path)
write_cpio_header(output, name, mode, 1, filesize)
output.write(latin(path))
output.write(padding(filesize, 4))
def cpio_mknod(output, *kw):
sys.stderr.write('nod is not implemented\n')
def cpio_mkpipe(output, *kw):
sys.stderr.write('pipe is not implemented\n')
def cpio_mksock(output, *kw):
sys.stderr.write('sock is not implemented\n')
def cpio_tailer(output):
name = 'TRAILER!!!'
write_cpio_header(output, name)
# normally, padding is ignored by decompresser
if hasattr(output, 'tell'):
output.write(padding(output.tell(), 512))
files = []
functions = {'dir': cpio_mkdir,
'file': cpio_mkfile,
'slink': cpio_mkslink,
'nod': cpio_mknod,
'pipe': cpio_mkpipe,
'sock': cpio_mksock}
while True:
line = cpiolist.readline()
if not line:
break
lines = line.split()
if len(lines) < 1 or lines[0] == '#':
continue
function = functions.get(lines[0])
if not function:
continue
lines.pop(0)
lines[0] = lines[0].replace(os.sep, '/') # if any
if lines[0] in files:
sys.stderr.write('ignore duplicate %s\n' % lines[0])
continue
files.append(lines[0])
function(output, *lines)
# for extra in ['/tmp', '/mnt']:
# if extra not in files:
# sys.stderr.write('add extra %s\n' % extra)
# cpio_mkdir(output, extra)
cpio_tailer(output)
cpiolist.close()
output.close()
def parse_yaffs2(image, directory):
''' parse yaffs2 image.
official document: (utils/mkyaffs2image)
https://android.googlesource.com/platform/external/yaffs2/+/master/yaffs2/
spare: yaffs_PackedTags2 in yaffs_packedtags2.h
chunk: yaffs_ExtendedTags in yaffs_guts.h
'''
path = '.'
filelist = {1: '.'}
class Complete(Exception):
pass
def read_chunk(image):
chunk = image.read(2048)
spare = image.read(64)
if not chunk:
raise Complete
assert len(spare) >= 16
return chunk, spare
def process_chunk(image):
chunk, spare = read_chunk(image)
nil, objectid, nil, bytecount = struct.unpack('<4I', spare[:16])
if bytecount == 0xffff:
assert len(chunk) >= 460
( filetype, parent,
nil, name, padding, mode,
uid, gid, atime, mtime, ctime,
filesize, equivalent, alias
) = struct.unpack('<iiH256s2sI5Iii160s', chunk[:460])
# only for little-endian
# ( filetype, parent,
# nil, name, mode,
# uid, gid, atime, mtime, ctime,
# filesize, equivalent, alias
# ) = struct.unpack('iiH256sI5Iii160s', chunk[:460])
parent = filelist.get(parent)
assert parent is not None
name = name.decode('latin').split('\x00')[0]
path = name and '%s/%s' % (parent, name) or parent
filelist[objectid] = path
fullname = '%s/%s' % (directory, path)
if filetype == 0: # unknown
pass
elif filetype == 1: # file
flag = os.O_CREAT | os.O_WRONLY | os.O_TRUNC
if hasattr(os, 'O_BINARY'):
flag |= os.O_BINARY
output = os.open(fullname, flag, mode)
while filesize > 0:
chunk, spare = read_chunk(image)
nil, nil, nil, bytecount = struct.unpack('<4I', spare[:16])
size = filesize < bytecount and filesize or bytecount
os.write(output, chunk[:size])
filesize -= size
os.close(output)
elif filetype == 2: # slink
alias = alias.decode('latin').split('\x00')[0]
try: os.symlink(alias, fullname)
except: sys.stderr.write('soft %s -> %s\n' % (fullname, alias))
elif filetype == 3: # dir
if not os.path.isdir(fullname):
os.makedirs(fullname, mode)
try: os.chmod(fullname, mode)
except: sys.stderr.write('directory mode is not supported')
elif filetype == 4: # hlink
link = filelist.get(equivalent)
try: os.link(filelist.get(equivalent), fullname)
except: sys.stderr.write('hard %s -> %s\n' % (fullname, link))
elif filetype == 5: # special
pass
while True:
try: process_chunk(image)
except Complete: break
image.close()
from gzip import GzipFile
class CPIOGZIP(GzipFile):
# dont write filename
def _write_gzip_header(self):
self.fileobj.write(struct.pack('4B', 0x1f, 0x8b, 0x08, 0x00))
self.fileobj.write(struct.pack('4s', latin('')))
self.fileobj.write(struct.pack('2B', 0x00, 0x03))
# don't check crc and length
def _read_eof(self):
pass
def parse_rle(rle, raw):
''' convert 565-rle format to raw file.
official document:
https://android.googlesource.com/platform/build/+/master/tools/rgb2565/to565.c
'''
r = lambda x: int(((x >> 11) & 0x1f) << 3)
g = lambda x: int(((x >> 5) & 0x3f) << 2)
b = lambda x: int((x & 0x1f) << 3)
total = 0
while True:
data = rle.read(4)
if not data:
break
assert len(data) == 4
count, color = struct.unpack('<2H', data)
total += count
while count:
count -= 1
raw.write(struct.pack('3B', r(color), g(color), b(color)))
rle.close()
raw.close()
return total
def parse_565(rle, raw):
''' convert 565 format to raw file.
official document:
https://android.googlesource.com/platform/build/+/master/tools/rgb2565/to565.c
'''
r = lambda x: int(((x >> 11) & 0x1f) << 3)
g = lambda x: int(((x >> 5) & 0x3f) << 2)
b = lambda x: int((x & 0x1f) << 3)
total = 0
while True:
data = rle.read(2)
if not data:
break
assert len(data) == 2
color, = struct.unpack('<H', data)
total += 1
raw.write(struct.pack('3B', r(color), g(color), b(color)))
rle.close()
raw.close()
return total
def write_rle(raw, rle):
''' convert raw file to 565-rle format.
'''
x = lambda r, g, b: ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3)
last = None
total = 0
while True:
rgb = raw.read(3)
if not rgb:
break
total += 1
assert len(rgb) == 3
color = x(*struct.unpack('3B', rgb))
if last is None:
pass
elif color == last and count != 0xffff:
count += 1
continue
else:
rle.write(struct.pack('<2H', count, last))
last = color
count = 1
if count:
rle.write(struct.pack('<2H', count, last))
raw.close()
rle.close()
return total
def write_565(raw, rle):
''' convert raw file to 565 format.
'''
x = lambda r, g, b: ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3)
last = None
total = 0
while True:
rgb = raw.read(3)
if not rgb:
break
total += 1
assert len(rgb) == 3
color = x(*struct.unpack('3B', rgb))
rle.write(struct.pack('<H', color))
raw.close()
rle.close()
return total
def unpack_simg(simg=None, img=None):
'''unpack sparse image
official document:
https://android.googlesource.com/platform/system/core/+/master/libsparse/
'''
sys.stderr.write('arguments: [sparse image] [raw image]\n')
sys.stderr.write('simg file: %s\n' % simg)
sys.stderr.write(' img file: %s\n' % img)
if simg is None or img is None:
return False
SPARSE_HEADER_MAJOR_VER = 1
SPARSE_HEADER_LEN = 28
CHUNK_HEADER_LEN = 12
CHUNK_TYPE_RAW = 0xCAC1
CHUNK_TYPE_FILL = 0xCAC2
CHUNK_TYPE_DONT_CARE = 0xCAC3
CHUNK_TYPE_CRC32 = 0xCAC4
NULL = latin('')
class SparseImageError(Exception):
pass
magic = struct.pack('<I', 0xed26ff3a)
wb = open(img, 'wb')
rb = open(simg, 'rb+')
mm = mmap.mmap(rb.fileno(), 0)
pos = -1
while True:
pos = mm.find(magic, pos + 1)
if pos < 0:
break
mm.seek(pos, 0)
(
_,
major_version,
minor_version,
file_hdr_sz,
chunk_hdr_sz,
blk_sz,
total_blks,
total_chunks,
image_checksum
) = struct.unpack('<I4H4I', mm.read(SPARSE_HEADER_LEN))
if major_version != SPARSE_HEADER_MAJOR_VER:
continue
if file_hdr_sz < SPARSE_HEADER_LEN:
continue
if chunk_hdr_sz < CHUNK_HEADER_LEN:
continue
# finally, get it
if file_hdr_sz > SPARSE_HEADER_LEN:
mm.seek(file_hdr_sz - SPARSE_HEADER_LEN, 1)
for _ in range(0, total_chunks):
(
chunk_type,
reserved,
chunk_sz,
total_sz
) = struct.unpack('<2H2I', mm.read(CHUNK_HEADER_LEN))
if file_hdr_sz > SPARSE_HEADER_LEN:
mm.seek(file_hdr_sz - SPARSE_HEADER_LEN, 1)
chunk_data_size = total_sz - chunk_hdr_sz
chunk_block_size = chunk_sz * blk_sz
if chunk_type == CHUNK_TYPE_RAW:
if chunk_data_size != chunk_block_size:
raise SparseImageError()
while chunk_data_size > 0:
if chunk_data_size > 8192:
size = 8192
else:
size = chunk_data_size
chunk_data_size -= size
wb.write(mm.read(size))
elif chunk_type == CHUNK_TYPE_FILL:
if chunk_data_size != 4:
raise SparseImageError()
while chunk_block_size > 0:
if chunk_block_size > 8192:
size = 8192
else:
size = chunk_block_size
chunk_block_size -= size
wb.write(mm.read(4) * (size / 4))
elif chunk_type == CHUNK_TYPE_DONT_CARE:
if chunk_data_size != 0:
raise SparseImageError()
while chunk_block_size > 0:
if chunk_block_size > 8192:
size = 8192
else:
size = chunk_block_size
chunk_block_size -= size
wb.write(struct.pack('%ss' % size, NULL))
elif chunk_type == CHUNK_TYPE_CRC32:
if chunk_data_size != 4:
raise SparseImageError()
mm.read(4)
else:
raise SparseImageError()
# should break?
pos = mm.tell()
rb.close()
wb.close()
__all__ = [ 'parse_updata',
'write_updata',
'parse_bootimg',
'write_bootimg',
'parse_cpio',
'write_cpio',
'parse_yaffs2',
'parse_rle',
'write_rle',
'parse_565',
'write_565',
'cpio_list',
'POSITION',
'unpack_simg',
]
# above is the module of bootimg
# below is only for usage...
def repack_bootimg(kernel_addr=None, ramdisk_addr=None, second_addr=None, tags_addr=None, cmdline=None, page_size=None, padding_size=None):
if os.path.exists('ramdisk.cpio.gz'):
ramdisk = 'ramdisk.cpio.gz'
else:
ramdisk = 'ramdisk.gz'
if os.path.exists('second.gz'):
second = 'second.gz'
elif os.path.exists('second'):
second = 'second'
else:
second = ''
if os.path.exists('dt.img'):
dtimg = 'dt.img'
else:
dtimg = ''
sys.stderr.write('arguments: [kernel_addr] [ramdisk_addr] [second_addr] [tags_addr] [cmdline] [page_size] [padding_size]\n')
metadata = {}
if os.path.exists('bootimg.json'):
try:
metadata = json.loads(open('bootimg.json').read())
except:
pass
if 'kernel_addr' in metadata:
kernel_addr = metadata.get('kernel_addr', 0)
else:
kernel_addr = int(kernel_addr, 16)
if 'ramdisk_addr' in metadata:
ramdisk_addr = metadata.get('ramdisk_addr', 0)
else:
ramdisk_addr = int(ramdisk_addr, 16)
if 'second_addr' in metadata:
second_addr = metadata.get('second_addr', 0)
else:
second_addr = int(second_addr, 16)
if 'tags_addr' in metadata:
tags_addr = metadata.get('tags_addr', 0)
else:
tags_addr = int(tags_addr, 16)
if 'name' in metadata:
name = latin(metadata.get('name'))
elif name is None:
name = latin('')
if 'cmdline' in metadata:
cmdline = latin(metadata.get('cmdline'))
elif cmdline is None:
cmdline = latin('mem=211M console=null androidboot.hardware=qcom')
if 'page_size' in metadata:
page_size = metadata.get('page_size', 2048)
else:
page_size = int(str(page_size))
if 'padding_size' in metadata:
padding_size = metadata.get('padding_size', 4096)
else:
padding_size = int(str(padding_size))
os_version = metadata.get('os_version', 0)
sys.stderr.write('kernel: kernel\n')
sys.stderr.write('ramdisk: %s\n' % ramdisk)
sys.stderr.write('second: %s\n' % second)
sys.stderr.write('dtimg: %s\n' % dtimg)
sys.stderr.write('kernel_addr: 0x%x\n' % kernel_addr)
sys.stderr.write('ramdisk_addr: 0x%x\n' % ramdisk_addr)
sys.stderr.write('second_addr: 0x%x\n' % second_addr)
sys.stderr.write('tags_addr: 0x%x\n' % tags_addr)
sys.stderr.write('name: %s\n' % name)
sys.stderr.write('cmdline: %s\n' % cmdline)
sys.stderr.write('page_size: %d\n' % page_size)
sys.stderr.write('padding_size: %d\n' % padding_size)
sys.stderr.write('output: boot_repack.img\n')
if os.path.isfile('kernel.gz'):
kernel = open('kernel.gz', 'rb')
else:
kernel = open('kernel', 'rb')
if os.path.isfile(kernel.name + '.dt'):
dt = open(kernel.name + '.dt', 'rb')
kerneldt = open(kernel.name + '.bundle', 'wb')