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Copy pathllcpp_parse.py
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executable file
·186 lines (147 loc) · 5.29 KB
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#!/usr/bin/env python
import sys
import struct
class terminator(object):
terminator = None
#TODO: Consider passing fmt substr instead of begin/end
def __init__(self, escape_begin, escape_end):
self.escape_begin = escape_begin
self.escape_end = escape_end
def read_arg(self, fmt, stream):
raise NotImplemented()
def read_variable_arg(self, fmt, stream):
raise NotImplemented()
class integer_terminator(terminator):
terminator = None
arg_size = None
is_unsigned = None
def read_arg(self, fmt, stream):
l_count = fmt[self.escape_begin + 1: self.escape_end - 1].count('l')
if l_count <= 1:
self.arg_size = 4
self.struct_id = "I" if self.is_unsigned else "i"
elif l_count == 2:
self.arg_size = 8
self.struct_id = "Q" if self.is_unsigned else "q"
else:
raise ValueError("Too many l's in format")
arg_data = stream.read(self.arg_size)
self.value = struct.unpack("<" + self.struct_id, arg_data)[0]
def read_variable_arg(self, fmt, stream):
pass
def __repr__(self):
return "Integer terminator. Escape {}-{}. Value {}".format(
self.escape_begin, self.escape_end, self.value)
class d(integer_terminator):
terminator = "d"
arg_size = 4
is_unsigned = False
class u(d):
terminator = "u"
is_unsigned = True
class x(d):
terminator = "x"
#TODO: Format as hex
class p(d):
terminator = "p"
is_unsigned = True
#TODO: Format as hex
class s(terminator):
terminator = "s"
def read_arg(self, fmt, stream):
self.value = ''
if self.escape_end - self.escape_begin <= 2:
self.is_fixed_size = False
self.fixed_size = 4
variable_len_data = stream.read(self.fixed_size)
self.variable_len = struct.unpack("<I", variable_len_data)[0]
else:
self.is_fixed_size = True
self.fixed_size = int(fmt[self.escape_begin + 1: self.escape_end - 1])
self.value = stream.read(self.fixed_size)
self.value = self.value.replace('\x00','')
def read_variable_arg(self, fmt, stream):
if not self.is_fixed_size:
self.value = stream.read(self.variable_len)
self.value = self.value.replace('\x00','')
def __repr__(self):
if self.is_fixed_size:
return 'String terminator. Escape: {}-{}. Fixed size {}. Value {}'.format(
self.escape_begin, self.escape_end, self.fixed_size, self.value)
else:
return 'String terminator. Escape: {}-{}. Fixed size {}. Variable Length {}. Value {}'.format(
self.escape_begin, self.escape_end, self.fixed_size, self.variable_len, self.value)
terminators = [d, u, x, s, p]
class log_line(object):
def __init__(self, stream):
self.stream = stream
self.line = ""
def read_fmt(self):
chars = []
while True:
c = self.stream.read(1)
if not c:
raise StopIteration()
if c == '\0':
break
chars.append(c)
fmt = ''.join(chars)
return fmt
def parse_fmt(self, fmt):
terminator_list = []
is_escaped = False
escape_begin = -1
for i, c in enumerate(fmt):
if c == '%':
if is_escaped and escape_begin == i - 1:
is_escaped = False
escape_begin = -1
else:
is_escaped = True
escape_begin = i
continue
if not is_escaped:
continue
candidates = filter(lambda x: x.terminator == c, terminators)
if not candidates:
continue
if len(candidates) > 1:
raise ValueError("More than one terminator match this character: {}".format(c))
term = candidates[0](escape_begin, i + 1)
terminator_list.append(term)
is_escaped = False
escape_begin = -1
return terminator_list
def parse(self):
fmt = self.read_fmt()
terminator_list = self.parse_fmt(fmt)
for term in terminator_list:
term.read_arg(fmt, self.stream)
for term in terminator_list:
term.read_variable_arg(fmt, self.stream)
line_parts = []
last_escape_end = 0
for term in terminator_list:
prev_fmt_part = fmt[last_escape_end: term.escape_begin]
line_parts.append(prev_fmt_part)
line_parts.append('{}'.format(term.value))
last_escape_end = term.escape_end
last_fmt_part = fmt[last_escape_end:]
line_parts.append(last_fmt_part)
self.line = ''.join(line_parts)
def __str__(self):
return self.line
class llcpp_parser(object):
def __init__(self, stream):
self.stream = stream
def lines(self):
while True:
line = log_line(self.stream)
line.parse()
yield str(line)
def main(argv):
parser = llcpp_parser(open(argv[1],'rb'))
for line in parser.lines():
sys.stdout.write(line)
if __name__ == '__main__':
main(sys.argv)