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package Data::ParseBinary::Executable::ELF32;
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1
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1
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939
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use strict;
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1
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3
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1
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41
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3
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1
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1
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6
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use warnings;
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1
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1
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32
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4
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5
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use Data::ParseBinary;
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1
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2
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1
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1111
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5
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6
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#"""
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7
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#Executable and Linkable Format (ELF), 32 bit, little endian
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8
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#Used on *nix systems as a replacement of the older a.out format
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9
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#"""
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10
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11
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my $elf32_program_header = Struct("program_header",
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12
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Enum(ULInt32("type"),
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13
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NULL => 0,
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14
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LOAD => 1,
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15
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DYNAMIC => 2,
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16
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INTERP => 3,
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17
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NOTE => 4,
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18
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SHLIB => 5,
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19
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PHDR => 6,
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20
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_default_ => $DefaultPass,
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21
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),
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ULInt32("offset"),
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ULInt32("vaddr"),
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ULInt32("paddr"),
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25
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ULInt32("file_size"),
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26
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ULInt32("mem_size"),
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27
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ULInt32("flags"),
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28
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ULInt32("align"),
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29
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);
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30
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31
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my $elf32_section_header = Struct("section_header",
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32
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ULInt32("name_offset"),
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33
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Pointer(sub { $_->ctx(2)->{strtab_data_offset} + $_->ctx->{name_offset} },
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CString("name")
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35
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),
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Enum(ULInt32("type"),
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NULL => 0,
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PROGBITS => 1,
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SYMTAB => 2,
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40
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STRTAB => 3,
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41
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RELA => 4,
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HASH => 5,
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43
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DYNAMIC => 6,
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NOTE => 7,
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NOBITS => 8,
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REL => 9,
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SHLIB => 10,
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48
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DYNSYM => 11,
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_default_ => $DefaultPass,
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),
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ULInt32("flags"),
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52
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ULInt32("addr"),
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53
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ULInt32("offset"),
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54
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ULInt32("size"),
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55
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ULInt32("link"),
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56
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ULInt32("info"),
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57
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ULInt32("align"),
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58
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ULInt32("entry_size"),
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59
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Pointer(sub { $_->ctx->{offset} },
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60
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Field("data", sub { $_->ctx->{size} })
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61
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),
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);
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63
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64
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our $elf32_parser = Struct("elf32_file",
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65
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Struct("identifier",
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66
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Const(Bytes("magic", 4), "\x7fELF"),
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67
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Enum(Byte("file_class"),
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68
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NONE => 0,
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69
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CLASS32 => 1,
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70
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CLASS64 => 2,
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71
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),
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72
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Enum(Byte("encoding"),
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73
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NONE => 0,
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74
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LSB => 1,
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75
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MSB => 2,
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76
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),
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77
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Byte("version"),
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78
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Padding(9),
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79
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),
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80
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Enum(ULInt16("type"),
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81
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NONE => 0,
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82
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RELOCATABLE => 1,
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83
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EXECUTABLE => 2,
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84
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SHARED => 3,
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85
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CORE => 4,
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86
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),
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87
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Enum(ULInt16("machine"),
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88
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NONE => 0,
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89
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M32 => 1,
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90
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SPARC => 2,
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91
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I386 => 3,
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92
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Motorolla68K => 4,
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93
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Motorolla88K => 5,
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94
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Intel860 => 7,
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95
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MIPS => 8,
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96
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),
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97
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ULInt32("version"),
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98
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ULInt32("entry"),
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99
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ULInt32("ph_offset"),
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100
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ULInt32("sh_offset"),
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101
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ULInt32("flags"),
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102
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ULInt16("header_size"),
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103
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ULInt16("ph_entry_size"),
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104
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ULInt16("ph_count"),
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105
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ULInt16("sh_entry_size"),
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106
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ULInt16("sh_count"),
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107
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ULInt16("strtab_section_index"),
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108
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109
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# calculate the string table data offset (pointer arithmetics)
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110
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# ugh... anyway, we need it in order to read the section names, later on
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111
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Pointer(sub { $_->ctx->{sh_offset} + $_->ctx->{strtab_section_index} * $_->ctx->{sh_entry_size} + 16 },
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112
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ULInt32("strtab_data_offset"),
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113
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),
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114
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115
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# program header table
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116
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Pointer(sub { $_->ctx->{ph_offset} },
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117
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Array(sub { $_->ctx->{ph_count} },
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118
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$elf32_program_header
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119
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)
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120
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),
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121
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122
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# section table
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123
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Pointer(sub { $_->ctx->{sh_offset} },
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124
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Array(sub { $_->ctx->{sh_count} },
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125
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$elf32_section_header
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126
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)
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127
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),
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128
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);
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129
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130
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require Exporter;
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131
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our @ISA = qw(Exporter);
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132
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our @EXPORT = qw($elf32_parser);
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133
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134
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135
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1;
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136
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137
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__END__
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