/usr/bin/simg_dump is in android-tools-fsutils 5.1.1.r38-1.1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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 | #! /usr/bin/python
# Copyright (C) 2012 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import print_function
import getopt, posixpath, signal, struct, sys
def usage(argv0):
print("""
Usage: %s [-v] sparse_image_file ...
-v verbose output
""" % ( argv0 ))
sys.exit(2)
def main():
signal.signal(signal.SIGPIPE, signal.SIG_DFL)
me = posixpath.basename(sys.argv[0])
# Parse the command line
verbose = 0 # -v
try:
opts, args = getopt.getopt(sys.argv[1:],
"v",
["verbose"])
except getopt.GetoptError, e:
print(e)
usage(me)
for o, a in opts:
if o in ("-v", "--verbose"):
verbose += 1
else:
print("Unrecognized option \"%s\"" % (o))
usage(me)
if len(args) == 0:
print("No sparse_image_file specified")
usage(me)
for path in args:
FH = open(path, 'rb')
header_bin = FH.read(28)
header = struct.unpack("<I4H4I", header_bin)
magic = header[0]
major_version = header[1]
minor_version = header[2]
file_hdr_sz = header[3]
chunk_hdr_sz = header[4]
blk_sz = header[5]
total_blks = header[6]
total_chunks = header[7]
image_checksum = header[8]
if magic != 0xED26FF3A:
print("%s: %s: Magic should be 0xED26FF3A but is 0x%08X"
% (me, path, magic))
continue
if major_version != 1 or minor_version != 0:
print("%s: %s: I only know about version 1.0, but this is version %u.%u"
% (me, path, major_version, minor_version))
continue
if file_hdr_sz != 28:
print("%s: %s: The file header size was expected to be 28, but is %u."
% (me, path, file_hdr_sz))
continue
if chunk_hdr_sz != 12:
print("%s: %s: The chunk header size was expected to be 12, but is %u."
% (me, path, chunk_hdr_sz))
continue
print("%s: Total of %u %u-byte output blocks in %u input chunks."
% (path, total_blks, blk_sz, total_chunks))
if image_checksum != 0:
print("checksum=0x%08X" % (image_checksum))
if not verbose:
continue
print(" input_bytes output_blocks")
print("chunk offset number offset number")
offset = 0
for i in xrange(1,total_chunks+1):
header_bin = FH.read(12)
header = struct.unpack("<2H2I", header_bin)
chunk_type = header[0]
reserved1 = header[1]
chunk_sz = header[2]
total_sz = header[3]
data_sz = total_sz - 12
print("%4u %10u %10u %7u %7u" % (i, FH.tell(), data_sz, offset, chunk_sz),
end=" ")
if chunk_type == 0xCAC1:
if data_sz != (chunk_sz * blk_sz):
print("Raw chunk input size (%u) does not match output size (%u)"
% (data_sz, chunk_sz * blk_sz))
break;
else:
print("Raw data", end="")
FH.read(data_sz)
elif chunk_type == 0xCAC2:
if data_sz != 4:
print("Fill chunk should have 4 bytes of fill, but this has %u"
% (data_sz), end="")
break;
else:
fill_bin = FH.read(4)
fill = struct.unpack("<I", fill_bin)
print("Fill with 0x%08X" % (fill))
elif chunk_type == 0xCAC3:
if data_sz != 0:
print("Don't care chunk input size is non-zero (%u)" % (data_sz))
break;
else:
print("Don't care", end="")
elif chunk_type == 0xCAC4:
if data_sz != 4:
print("CRC32 chunk should have 4 bytes of CRC, but this has %u"
% (data_sz), end="")
break;
else:
crc_bin = FH.read(4)
crc = struct.unpack("<I", crc)
print("Unverified CRC32 0x%08X" % (crc))
else:
print("Unknown chunk type 0x%04X" % (chunk_type), end="")
break;
if verbose > 1:
header = struct.unpack("<12B", header_bin)
print(" (%02X%02X %02X%02X %02X%02X%02X%02X %02X%02X%02X%02X)"
% (header[0], header[1], header[2], header[3],
header[4], header[5], header[6], header[7],
header[8], header[9], header[10], header[11]))
else:
print()
offset += chunk_sz
print(" %10u %7u End" % (FH.tell(), offset))
if total_blks != offset:
print("The header said we should have %u output blocks, but we saw %u"
% (total_blks, offset))
junk_len = len(FH.read())
if junk_len:
print("There were %u bytes of extra data at the end of the file."
% (junk_len))
sys.exit(0)
if __name__ == "__main__":
main()
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