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# Copyright 2004 by Audrey Tang <cpan@audreyt.org>
package Win32::Exe::Section;
use strict;
use base 'Win32::Exe::Base';
use constant FORMAT => (
Name => 'Z8',
VirtualSize => 'V',
VirtualAddress => 'V',
FileSize => 'V',
FileOffset => 'V',
RelocOffset => 'V',
LineNumOffset => 'V',
NumReloc => 'v',
NumLineNum => 'v',
Flags => 'V',
);
use constant DISPATCH_FIELD => 'Name';
use constant DISPATCH_TABLE => (
'.text' => 'Section::Code',
'.debug' => 'Section::Debug',
'.data' => 'Section::Data',
'.rdata' => 'Section::Data',
'.bss' => 'Section::Data',
'.edata' => 'Section::Exports',
'.idata' => 'Section::Imports',
'.rsrc' => 'Section::Resources',
);
use constant CONTAINS_CODE => 0x20;
use constant CONTAINS_IDATA => 0x40;
use constant CONTAINS_UDATA => 0x80;
sub Data {
my ($self) = @_;
$self->{data} ||= do {
my $v_size = $self->VirtualSize;
my $f_size = $self->FileSize or return("\0" x $v_size);
$f_size = $v_size if ($v_size && ( $v_size < $f_size));
my $data = $self->parent->substr($self->FileOffset, $f_size);
$data .= ("\x0" x ($v_size - length($data)));
$data;
}
}
sub SetData {
my ($self, $data) = @_;
my $pad_size = length($1) if $data =~ s/(\0*)\z//;
my $exe = $self->parent;
my $act_headersize = $exe->OptHeaderSize;
my $exp_headersize = $exe->ExpectedOptHeaderSize;
($act_headersize && ( $act_headersize == $exp_headersize )) or die "Unsupported binary format: headersize $act_headersize ne $exp_headersize";
my $index = $self->sibling_index;
my $data_size = length($data);
my $f_size = $self->align($data_size, $exe->FileAlign);
my $v_size = $self->align($data_size, $exe->SectionAlign);
my $f_extra = $f_size - $self->FileSize;
my $v_extra = $v_size - $self->align($self->VirtualSize, $exe->SectionAlign);
$self->pad_data($f_extra, $v_extra) if $f_extra;
$self->SetVirtualSize($data_size + $pad_size);
$data .= ("\0" x ($self->FileSize - $data_size));
$exe->substr($self->FileOffset, length($data), $data);
$self->update_size;
}
sub update_size {
my ($self) = @_;
my $exe = $self->parent;
my $v_addr = $self->VirtualAddress;
my $v_size = $self->VirtualSize;
foreach my $dir ($exe->data_directories) {
next unless $dir->VirtualAddress == $v_addr;
$dir->SetSize($v_size);
$dir->refresh;
}
}
sub pad_data {
my ($self, $f_extra, $v_extra) = @_;
my $exe = $self->parent;
my $offset = $self->FileOffset + $self->FileSize;
$exe->update_debug_directory($offset, $f_extra);
my $exe_size = $exe->size;
if ($exe_size > $offset) {
my $buf = $exe->substr($offset, ($exe_size - $offset));
$exe->substr($offset + $f_extra, length($buf), $buf);
}
$exe->set_size($exe_size + $f_extra);
if ($f_extra > 0) {
$exe->SetData($exe->Data . ("\0" x $f_extra));
}
else {
$exe->SetData(substr($exe->Data, 0, $f_extra));
}
my $index = $self->sibling_index;
foreach my $section (@{$self->siblings}) {
next if $section->sibling_index <= $index;
$section->update_offset($f_extra, $v_extra);
}
$self->SetFileSize($self->FileSize + $f_extra);
$exe->SetImageSize($exe->ImageSize + $v_extra);
my $flags = $self->Flags;
$exe->SetCodeSize($exe->CodeSize + $f_extra) if $flags & CONTAINS_CODE;
$exe->SetIDataSize($exe->IDataSize + $f_extra) if $flags & CONTAINS_IDATA;
$exe->SetUDataSize($exe->UDataSize + $f_extra) if $flags & CONTAINS_UDATA;
}
sub update_offset {
my ($self, $f_extra, $v_extra) = @_;
return unless $f_extra > 0;
my $exe = $self->parent;
my $v_addr = $self->VirtualAddress;
$self->SetVirtualAddress( $v_addr + $v_extra );
$self->SetFileOffset( $self->FileOffset + $f_extra );
foreach my $dir ($exe->data_directories) {
next unless $dir->VirtualAddress == $v_addr;
$dir->SetVirtualAddress($self->VirtualAddress);
}
}
sub substr {
my $self = shift;
my $data = $self->Data;
my $offset = shift;
my $length = @_ ? shift(@_) : (length($data) - $offset);
my $replace = shift;
return substr($data, $offset, $length) if !defined $replace;
substr($data, $offset, $length, $replace);
$self->SetData($data);
}
1;
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