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annotate pytouhou/utils/pe.py @ 305:5492472963b0

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Minor cleanup
author Thibaut Girka <thib@sitedethib.com>
date Tue, 13 Mar 2012 18:45:43 +0100
parents 5afc75f71fed
children e15672733c93
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rev   line source
229
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1 # -*- encoding: utf-8 -*-
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2 ##
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3 ## Copyright (C) 2011 Thibaut Girka <thib@sitedethib.com>
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4 ##
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5 ## This program is free software; you can redistribute it and/or modify
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6 ## it under the terms of the GNU General Public License as published
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7 ## by the Free Software Foundation; version 3 only.
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8 ##
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9 ## This program is distributed in the hope that it will be useful,
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10 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 ## GNU General Public License for more details.
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13 ##
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14
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15 from struct import Struct, unpack
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16 from collections import namedtuple
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17
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18
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19 class PEStructs:
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20 _IMAGE_FILE_HEADER = namedtuple('_IMAGE_FILE_HEADER',
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21 ('Machine',
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22 'NumberOfSections',
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23 'TimeDateStamp',
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24 'PointerToSymbolTable',
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25 'NumberOfSymbols',
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26 'SizeOfOptionalHeader',
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27 'Characteristics'))
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28 @classmethod
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29 def read_image_file_header(cls, file):
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30 format = Struct('<HHIIIHH')
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31 return cls._IMAGE_FILE_HEADER(*format.unpack(file.read(format.size)))
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32
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33 _IMAGE_OPTIONAL_HEADER = namedtuple('_IMAGE_OPTIONAL_HEADER',
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34 ('Magic',
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35 'MajorLinkerVersion', 'MinorLinkerVersion',
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36 'SizeOfCode', 'SizeOfInitializedData',
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37 'SizeOfUninitializedData',
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38 'AddressOfEntryPoint', 'BaseOfCode',
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39 'BaseOfData', 'ImageBase',
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40 'SectionAlignement', 'FileAlignement',
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41 'MajorOperatingSystemVersion',
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42 'MinorOperatingSystemVersion',
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43 'MajorImageVersion',
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44 'MinorImageVersion',
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45 'MajorSubsystemVersion',
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46 'MinorSubsystemVersion',
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47 'Win32VersionValue',
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48 'SizeOfImage',
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49 'SizeOfHeaders',
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50 'CheckSum',
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51 'Subsystem',
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52 'DllCharacteristics',
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53 'SizeOfStackReserve',
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54 'SizeOfStackCommit',
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55 'SizeOfHeapReserve',
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56 'SizeOfHeapCommit',
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57 'LoaderFlags',
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58 'NumberOfRvaAndSizes',
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59 'DataDirectory'))
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60 _IMAGE_DATA_DIRECTORY = namedtuple('_IMAGE_DATA_DIRECTORY',
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61 ('VirtualAddress', 'Size'))
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62 @classmethod
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63 def read_image_optional_header(cls, file):
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64 format = Struct('<HBBIIIIIIIIIHHHHHHIIIIHHIIIIII')
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65 directory_format = Struct('<II')
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66 directory = []
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67 partial_header = format.unpack(file.read(format.size))
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68 directory = [cls._IMAGE_DATA_DIRECTORY(*directory_format.unpack(file.read(directory_format.size))) for i in xrange(16)]
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69 return cls._IMAGE_OPTIONAL_HEADER(*(partial_header + (directory,)))
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70
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71 _IMAGE_SECTION_HEADER = namedtuple('_IMAGE_SECTION_HEADER',
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72 ('Name', 'VirtualSize',
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73 'VirtualAddress',
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74 'SizeOfRawData', 'PointerToRawData',
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75 'PointerToRelocations',
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76 'PointerToLinenumbers',
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77 'NumberOfRelocations',
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78 'NumberOfLinenumbers',
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79 'Characteristics'))
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80 @classmethod
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81 def read_image_section_header(cls, file):
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82 format = Struct('<8sIIIIIIHHI')
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83 return cls._IMAGE_SECTION_HEADER(*format.unpack(file.read(format.size)))
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84
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85
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86
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87 class PEFile(object):
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88 def __init__(self, file):
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89 self.file = file
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90
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91 self.image_base = 0
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92 self.sections = []
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93
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94 file.seek(0x3c)
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95 pe_offset, = unpack('<I', file.read(4))
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96
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97 file.seek(pe_offset)
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98 pe_sig = file.read(4)
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99 assert pe_sig == b'PE\0\0'
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100
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101 pe_file_header = PEStructs.read_image_file_header(file)
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102 pe_optional_header = PEStructs.read_image_optional_header(file)
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103
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104 # Read image base
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105 self.image_base = pe_optional_header.ImageBase
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106
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107 self.sections = [PEStructs.read_image_section_header(file)
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108 for i in xrange(pe_file_header.NumberOfSections)]
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109
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110
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111 def seek_to_va(self, va):
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112 self.file.seek(self.va_to_offset(va))
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113
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114
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115 def offset_to_rva(self, offset):
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116 for section in self.sections:
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117 if 0 <= (offset - section.PointerToRawData) < section.SizeOfRawData:
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118 #TODO: is that okay?
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119 return offset - section.PointerToRawData + section.VirtualAddress
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120 raise IndexError #TODO
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121
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122
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123 def offset_to_va(self, offset):
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124 return self.offset_to_rva(offset) + self.image_base
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125
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126
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127 def rva_to_offset(self, rva):
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128 for section in self.sections:
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129 if 0 <= (rva - section.VirtualAddress) < section.SizeOfRawData:
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130 #TODO: is that okay?
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131 return rva - section.VirtualAddress + section.PointerToRawData
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132 raise IndexError #TODO
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133
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134
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135 def va_to_offset(self, va):
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136 return self.rva_to_offset(va - self.image_base)
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137