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# Copyright (C) 2016 Santosh Sivaraj <santosiv@in.ibm.com>
#
# 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
import struct
import csv
import os
PAGE_SIZE=4096
def quotechars(chars):
return ''.join( ['.', c][c.isalnum()] for c in chars)
def hexdump(chars, sep, width):
while chars:
line = chars[:width]
chars = chars[width:]
line = line.ljust( width, '\000' )
print "%s%s%s" % (sep.join( "%02x" % ord(c) for c in line ),
sep, quotechars(line))
def pack_text(text):
# Won't be fun if all goes well.. so here we might get empty texts, if so
# we just need to update the length field to the length of the length
# field. See catalog proposal document if you don't get this.
if text == None or len(text) == 0:
text_bin = struct.pack(">H", 2)
else:
l = len(text) + 1 + 2 # a null byte included
if l % 2 != 0:
l += 2 - l % 2
text_bin = struct.pack(">H%ds" % (l - 2), l, text)
return text_bin
def pad16(dump):
# default is 16 bit length, the old formula structure had a bug, mentioning
# it as 32 bit structure length
tlen = len(dump) + 2
plen = 0
if tlen % 16 != 0:
plen = 16 - tlen % 16;
tlen += plen
slen = struct.pack(">H", tlen)
padding = struct.pack("%dx" % (plen))
return slen + dump + padding
def pad_page(dump, page_size):
if len(dump) % page_size != 0:
# pad the remaining page
dump += struct.pack("%dx" % (PAGE_SIZE - len(dump) % PAGE_SIZE))
return dump
def read_string(dump):
nlen = struct.unpack_from(">H", dump)[0]
if nlen == 0:
print """ERROR: A string length can never be zero, it should be atleast of
length 2, which will always include the length of the length field.
Please check your offsets"""
exit(1)
name = struct.unpack_from(">%ds" % (nlen - 2), dump[2:])
return name[0], nlen
def write_to_csv(csv_file, dict_list):
f = open(csv_file, 'wt')
try:
writer = csv.writer(f, lineterminator=os.linesep)
# dump the header
writer.writerow((dict_list[0].keys()))
for d in dict_list:
writer.writerow((d.values()))
finally:
f.close()
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