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#! /usr/bin/env 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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