(原文)http://2net.co.uk/tutorial/android-sparse-image-formatsimg_dump.py. Here is an example:
$ system/core/libsparse/simg_dump.py -v dist_output/target_files-eng/IMAGES/userdata.img
dist_output/target_files-eng/IMAGES/userdata.img: Total of 524288 4096-byte output blocks in 55 input chunks.
input_bytes output_blocks
chunk offset number offset number
1 40 4096 0 1 Raw data
2 4148 4096 1 1 Raw data
3 8256 520192 2 127 Raw data
4 528460 8192 129 2 Raw data
5 536664 2097152 131 512 Raw data
6 2633828 33554432 643 8192 Raw data
7 36188272 4096 8835 1 Raw data
8 36192380 4096 8836 1 Raw data
9 36196488 4096 8837 1 Raw data
10 36200596 0 8838 23930 Don't care
11 36200608 4096 32768 1 Raw data
12 36204716 4096 32769 1 Raw data
13 36208824 0 32770 127 Don't care
14 36208836 8192 32897 2 Raw data
15 36217040 0 32899 32637 Don't care
16 36217052 8192 65536 2 Raw data
17 36225256 0 65538 32766 Don't care
18 36225268 4096 98304 1 Raw data
19 36229376 4096 98305 1 Raw data
20 36233484 0 98306 127 Don't care
21 36233496 8192 98433 2 Raw data
22 36241700 0 98435 32637 Don't care
23 36241712 8192 131072 2 Raw data
24 36249916 0 131074 32766 Don't care
25 36249928 4096 163840 1 Raw data
26 36254036 4096 163841 1 Raw data
27 36258144 0 163842 127 Don't care
28 36258156 8192 163969 2 Raw data
29 36266360 0 163971 32637 Don't care
30 36266372 8192 196608 2 Raw data
31 36274576 0 196610 32766 Don't care
32 36274588 4096 229376 1 Raw data
33 36278696 4096 229377 1 Raw data
34 36282804 0 229378 127 Don't care
35 36282816 8192 229505 2 Raw data
36 36291020 0 229507 32637 Don't care
37 36291032 8192 262144 2 Raw data
38 36299236 0 262146 32766 Don't care
39 36299248 4096 294912 1 Raw data
40 36303356 4096 294913 1 Raw data
41 36307464 0 294914 127 Don't care
42 36307476 8192 295041 2 Raw data
43 36315680 0 295043 32637 Don't care
44 36315692 8192 327680 2 Raw data
45 36323896 0 327682 32766 Don't care
46 36323908 8192 360448 2 Raw data
47 36332112 0 360450 32766 Don't care
48 36332124 8192 393216 2 Raw data
49 36340328 0 393218 32766 Don't care
50 36340340 8192 425984 2 Raw data
51 36348544 0 425986 32766 Don't care
52 36348556 8192 458752 2 Raw data
53 36356760 0 458754 32766 Don't care
54 36356772 8192 491520 2 Raw data
55 36364976 0 491522 32766 Don't care
36364976 524288 End