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package Data::ParseBinary::Executable::ELF32;
use strict;
use warnings;
use Data::ParseBinary;
#"""
#Executable and Linkable Format (ELF), 32 bit, little endian
#Used on *nix systems as a replacement of the older a.out format
#"""
my $elf32_program_header = Struct("program_header",
Enum(ULInt32("type"),
NULL => 0,
LOAD => 1,
DYNAMIC => 2,
INTERP => 3,
NOTE => 4,
SHLIB => 5,
PHDR => 6,
_default_ => $DefaultPass,
),
ULInt32("offset"),
ULInt32("vaddr"),
ULInt32("paddr"),
ULInt32("file_size"),
ULInt32("mem_size"),
ULInt32("flags"),
ULInt32("align"),
);
my $elf32_section_header = Struct("section_header",
ULInt32("name_offset"),
Pointer(sub { $_->ctx(2)->{strtab_data_offset} + $_->ctx->{name_offset} },
CString("name")
),
Enum(ULInt32("type"),
NULL => 0,
PROGBITS => 1,
SYMTAB => 2,
STRTAB => 3,
RELA => 4,
HASH => 5,
DYNAMIC => 6,
NOTE => 7,
NOBITS => 8,
REL => 9,
SHLIB => 10,
DYNSYM => 11,
_default_ => $DefaultPass,
),
ULInt32("flags"),
ULInt32("addr"),
ULInt32("offset"),
ULInt32("size"),
ULInt32("link"),
ULInt32("info"),
ULInt32("align"),
ULInt32("entry_size"),
Pointer(sub { $_->ctx->{offset} },
Field("data", sub { $_->ctx->{size} })
),
);
our $elf32_parser = Struct("elf32_file",
Struct("identifier",
Const(Bytes("magic", 4), "\x7fELF"),
Enum(Byte("file_class"),
NONE => 0,
CLASS32 => 1,
CLASS64 => 2,
),
Enum(Byte("encoding"),
NONE => 0,
LSB => 1,
MSB => 2,
),
Byte("version"),
Padding(9),
),
Enum(ULInt16("type"),
NONE => 0,
RELOCATABLE => 1,
EXECUTABLE => 2,
SHARED => 3,
CORE => 4,
),
Enum(ULInt16("machine"),
NONE => 0,
M32 => 1,
SPARC => 2,
I386 => 3,
Motorolla68K => 4,
Motorolla88K => 5,
Intel860 => 7,
MIPS => 8,
),
ULInt32("version"),
ULInt32("entry"),
ULInt32("ph_offset"),
ULInt32("sh_offset"),
ULInt32("flags"),
ULInt16("header_size"),
ULInt16("ph_entry_size"),
ULInt16("ph_count"),
ULInt16("sh_entry_size"),
ULInt16("sh_count"),
ULInt16("strtab_section_index"),
# calculate the string table data offset (pointer arithmetics)
# ugh... anyway, we need it in order to read the section names, later on
Pointer(sub { $_->ctx->{sh_offset} + $_->ctx->{strtab_section_index} * $_->ctx->{sh_entry_size} + 16 },
ULInt32("strtab_data_offset"),
),
# program header table
Pointer(sub { $_->ctx->{ph_offset} },
Array(sub { $_->ctx->{ph_count} },
$elf32_program_header
)
),
# section table
Pointer(sub { $_->ctx->{sh_offset} },
Array(sub { $_->ctx->{sh_count} },
$elf32_section_header
)
),
);
require Exporter;
our @ISA = qw(Exporter);
our @EXPORT = qw($elf32_parser);
1;
__END__
=head1 NAME
Data::ParseBinary::Executable::ELF32 - Parsing UNIX's SO files
=head1 SYNOPSIS
use Data::ParseBinary::Executable::ELF32 qw{$elf32_parser};
my $data = $elf32_parser->parse(CreateStreamReader(File => $fh));
Can parse and re-build UNIX "so" files.
This is a part of the Data::ParseBinary package, and is just one ready-made parser.
please go to the main page for additional usage info.
No known issues
=cut
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