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annotate pytouhou/utils/pe.py @ 316:f0be7ea62330

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Fix a bug with ECL instruction 96, and fix overall ECL handling. The issue with instruction 96 was about death callbacks, being executed on the caller of instruction 96 instead of the dying enemies. This was introduced by changeset 5930b33a0370. Additionnaly, ECL processes are now an attribute of the Enemy, and death/timeout conditions are checked right after the ECL frame, even if the ECL script has already ended, just like in the original game.
author Thibaut Girka <thib@sitedethib.com>
date Thu, 29 Mar 2012 21:18:35 +0200
parents 5afc75f71fed
children e15672733c93
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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