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#!/usr/bin/python
# A super-simple standalone script (works with both Python2 / Python3 and has
# no external dependencies) to show how easily .bmap files can be parsed.
# (Also demonstrates how little code it takes - which might be a useful starting
# point for other languages)
#
# This is effectively a minimal version of 'bmaptool copy'. It only supports
# uncompressed images, it does no verification, and if the image is named
# mydata.img it assumes the corresponding bmap is named mydata.bmap
# Copyright (C) 2018 Andrew Scheller
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import sys
import xml.etree.ElementTree as ET
import re
import os
if len(sys.argv) != 3:
print("Usage: %s <raw-file> <output-file>" % os.path.basename(sys.argv[0]))
sys.exit(1)
raw_file = sys.argv[1]
output_file = sys.argv[2]
if not os.path.isfile(raw_file):
print("raw-file '%s' doesn't exist" % raw_file)
sys.exit(1)
file_root, file_ext = os.path.splitext(raw_file)
bmap_file = file_root + ".bmap"
if not os.path.isfile(bmap_file):
print("bmap-file '%s' doesn't exist" % bmap_file)
sys.exit(1)
bmap_root = ET.parse(bmap_file).getroot()
blocksize = int(bmap_root.find("BlockSize").text)
with open(raw_file, "rb") as filedata:
with open(output_file, "wb") as outdata:
try:
outdata.truncate(int(bmap_root.find("ImageSize").text)) # optional
except:
pass
for bmap_range in bmap_root.find("BlockMap").findall("Range"):
blockrange = bmap_range.text
m = re.match("^\s*(\d+)\s*-\s*(\d+)\s*$", blockrange)
if m:
start = int(m.group(1))
end = int(m.group(2))
else:
start = int(blockrange)
end = start
start_offset = start * blocksize
filedata.seek(start_offset, 0)
outdata.seek(start_offset, 0)
for i in range(end - start + 1):
outdata.write(filedata.read(blocksize))
outdata.flush()
os.fsync(outdata.fileno())
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