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106 lines
3.1 KiB
106 lines
3.1 KiB
#
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# Copyright (C) 2017 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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"""Parses the contents of a sancov file generated by LLVM Sanitizer Coverage.
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Typical usage example:
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ParseSancovFile(file_name)
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"""
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import struct
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import parser
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MAGIC32 = 0xC0BFFFFFFFFFFF32
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MAGIC64 = 0xC0BFFFFFFFFFFF64
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class SancovParser(object):
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"""Sancov parser object to represent *.sancov files.
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Attributes:
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_sancov_file: the stream-like file handle to a sancov file
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_bitness: the bitness of the offsets (32/64)
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_entry_type: the type of each offset (32bit->Integer, 64bit->Long)
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"""
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def __init__(self, sancov_file):
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"""Inits the parser with the input stream and default values.
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Args:
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sancov_file: An input binary file stream to a .sancov file
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"""
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self._sancov_file = sancov_file
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self._bitness = -1
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self._entry_type = None
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self._size = 0
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def Parse(self):
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"""Runs the parser to generate the unpacked binary offsets in the file.
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Returns:
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A tuple of offsets into the original binary.
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Raises:
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parser.FileFormatError: invalid file format or invalid counts.
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"""
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self.GetBitness()
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return struct.unpack_from(
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self._entry_type * (self._size * 8 / self._bitness),
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self._sancov_file.read(self._size))
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def GetBitness(self):
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"""Parses the magic header to determine the bitness.
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Returns:
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The sancov file bitness.
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Raises:
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parser.FileFormatError: invalid file format or invalid counts.
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"""
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if self._bitness > 0:
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return self._bitness
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self._sancov_file.seek(0, 2)
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self._size = self._sancov_file.tell() - 8
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self._sancov_file.seek(0, 0)
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if self._size < 0:
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raise parser.FileFormatError('Empty file.')
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magic = struct.unpack('L', self._sancov_file.read(8))[0];
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if magic == MAGIC64:
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self._entry_type = 'L'
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self._bitness = 64
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elif magic == MAGIC32:
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self._entry_type = 'I'
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self._bitness = 32
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else:
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raise parser.FileFormatError('Invalid magic.')
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return self._bitness
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def ParseSancovFile(file_name):
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"""Parses the .sancov file specified by the input.
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Args:
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file_name: A string file path to a .sancov file
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Returns:
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A tuple of bitness, and the unpacked offsets into the original binary.
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"""
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with open(file_name, 'rb') as stream:
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p = SancovParser(stream)
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offsets = p.Parse()
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return (p._bitness, offsets)
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