mirror of
https://github.com/xcat2/xNBA.git
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342 lines
7.3 KiB
Perl
Executable File
342 lines
7.3 KiB
Perl
Executable File
#!/usr/bin/perl -w
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use strict;
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use FileHandle;
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use integer;
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sub unsigned_little_endian_to_value
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{
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# Assumes the data is initially little endian
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my ($buffer) = @_;
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my $bytes = length($buffer);
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my $value = 0;
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my $i;
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for($i = $bytes -1; $i >= 0; $i--) {
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my $byte = unpack('C', substr($buffer, $i, 1));
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$value = ($value * 256) + $byte;
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}
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return $value;
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}
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sub decode_fixed_string
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{
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my ($data, $bytes) = @_;
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return $data;
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}
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sub decode_pstring
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{
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my ($buf_ref, $offset_ref) = @_;
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# Decode a pascal string
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my $offset = ${$offset_ref};
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my $len = unpack('C',substr(${$buf_ref}, $offset, 1));
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my $data = substr(${$buf_ref}, $offset +1, $len);
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${$offset_ref} = $offset + $len +1;
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return $data;
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}
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sub decode_cstring
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{
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# Decode a c string
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my ($buf_ref, $offset_ref) = @_;
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my ($data, $byte);
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my $index = ${$offset_ref};
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while(1) {
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$byte = substr(${$buf_ref}, $index, 1);
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if (!defined($byte) || ($byte eq "\0")) {
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last;
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}
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$data .= $byte;
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$index++;
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}
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${$offset_ref} = $index;
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return $data;
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}
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sub type_size
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{
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my ($entry) = @_;
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my %type_length = (
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byte => 1,
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half => 2,
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word => 4,
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xword => 8,
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'fixed-string' => $entry->[2],
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pstring => 0,
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cstring => 0,
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);
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my $type = $entry->[0];
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if (!exists($type_length{$type})) {
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die "unknown type $type";
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}
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my $length = $type_length{$type};
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return $length;
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}
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sub decode_fixed_type
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{
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my ($type, $data, $bytes) = @_;
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my %decoders = (
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'byte' => \&unsigned_little_endian_to_value,
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'half' => \&unsigned_little_endian_to_value,
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'word' => \&unsigned_little_endian_to_value,
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'xword' => \&unsigned_little_endian_to_value,
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'fixed-string' => \&decode_fixed_string,
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);
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my $decoder = $decoders{$type} or die "unknow fixed type $type";
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return $decoder->($data, $bytes);
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}
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sub decode_variable_type
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{
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my ($type, $buf_ref, $offset_ref) = @_;
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my %decoders = (
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'pstring' => \&decode_pstring,
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'cstring' => \&decode_cstring,
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);
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my $decoder = $decoders{$type} or die "unknow variable type $type";
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return $decoder->($buf_ref, $offset_ref);
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}
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sub decode_struct
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{
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my ($buf_ref, $offset, $layout) = @_;
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my $initial_offset = $offset;
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my ($entry, %results);
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foreach $entry (@$layout) {
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my ($type, $name) = @$entry;
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my $bytes = type_size($entry);
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if ($bytes > 0) {
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my $data = substr(${$buf_ref}, $offset, $bytes);
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$results{$name} = decode_fixed_type($type, $data, $bytes);
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$offset += $bytes;
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} else {
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$results{$name} = decode_variable_type($type, $buf_ref, \$offset);
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}
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}
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return (\%results, $offset - $initial_offset);
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}
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sub print_big_hex
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{
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my ($min_digits, $value) = @_;
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my @digits;
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while($min_digits > 0 || ($value > 0)) {
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my $digit = $value%16;
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$value /= 16;
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unshift(@digits, $digit);
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$min_digits--;
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}
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my $digit;
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foreach $digit (@digits) {
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printf("%01x", $digit);
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}
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}
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my %lha_signatures = (
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'-com-' => 1,
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'-lhd-' => 1,
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'-lh0-' => 1,
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'-lh1-' => 1,
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'-lh2-' => 1,
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'-lh3-' => 1,
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'-lh4-' => 1,
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'-lh5-' => 1,
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'-lzs-' => 1,
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'-lz4-' => 1,
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'-lz5-' => 1,
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'-afx-' => 1,
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'-lzf-' => 1,
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);
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my %lha_os = (
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'M' => 'MS-DOS',
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'2' => 'OS/2',
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'9' => 'OS9',
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'K' => 'OS/68K',
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'3' => 'OS/386',
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'H' => 'HUMAN',
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'U' => 'UNIX',
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'C' => 'CP/M',
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'F' => 'FLEX',
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'm' => 'Mac',
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'R' => 'Runser',
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'T' => 'TownOS',
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'X' => 'XOSK',
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'A' => 'Amiga',
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'a' => 'atari',
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' ' => 'Award ROM',
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);
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my @lha_level_1_header = (
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[ 'byte', 'header_size' ], # 1
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[ 'byte', 'header_sum', ], # 2
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[ 'fixed-string', 'method_id', 5 ], # 7
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[ 'word', 'skip_size', ], # 11
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[ 'word', 'original_size' ], # 15
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[ 'half', 'dos_time' ], # 17
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[ 'half', 'dos_date' ], # 19
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[ 'byte', 'fixed' ], # 20
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[ 'byte', 'level' ], # 21
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[ 'pstring', 'filename' ], # 22
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[ 'half', 'crc' ],
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[ 'fixed-string', 'os_id', 1 ],
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[ 'half', 'ext_size' ],
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);
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# General lha_header
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my @lha_header = (
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[ 'byte', 'header_size' ],
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[ 'byte', 'header_sum', ],
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[ 'fixed-string', 'method_id', 5 ],
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[ 'word', 'skip_size', ],
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[ 'word', 'original_size' ],
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[ 'half', 'dos_time' ],
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[ 'half', 'dos_date' ],
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[ 'half', 'rom_addr' ],
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[ 'half', 'rom_flags' ],
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[ 'byte', 'fixed' ],
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[ 'byte', 'level' ],
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[ 'pstring', 'filename' ],
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[ 'half', 'crc' ],
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[ 'lha_os', 'os_id', 1 ],
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[ 'half', 'ext_size' ],
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[ 'byte', 'zero' ],
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[ 'byte', 'total_checksum' ],
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[ 'half', 'total_size' ],
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);
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sub print_struct
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{
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my ($layout, $self) = @_;
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my $entry;
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my $width = 0;
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foreach $entry(@$layout) {
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my ($type, $name) = @$entry;
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if (length($name) > $width) {
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$width = length($name);
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}
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}
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foreach $entry (@$layout) {
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my ($type, $name) = @$entry;
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printf("%*s = ", $width, $name);
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my $value = $self->{$name};
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if (!defined($value)) {
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print "undefined";
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}
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elsif ($type eq "lha_os") {
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print "$lha_os{$value}";
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}
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elsif ($type =~ m/string/) {
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print "$value";
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}
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else {
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my $len = type_size($entry);
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print "0x";
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print_big_hex($len *2, $value);
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}
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print "\n";
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}
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}
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sub checksum
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{
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my ($buf_ref, $offset, $length) = @_;
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my ($i, $sum);
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$sum = 0;
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for($i = 0; $i < $length; $i++) {
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my $byte = unpack('C', substr($$buf_ref, $offset + $i, 1));
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$sum = ($sum + $byte) %256;
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}
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return $sum;
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}
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sub decode_lha_header
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{
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my ($buf_ref, $offset) = @_;
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my $level = unpack('C',substr(${$buf_ref}, $offset + 20, 1));
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my %self;
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my ($struct, $bytes);
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if ($level == 1) {
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($struct, $bytes)
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= decode_struct($buf_ref, $offset, \@lha_level_1_header);
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%self = %$struct;
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if ($self{fixed} != 0x20) {
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die "bad fixed value";
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}
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$self{total_size} = $self{header_size} + 2 + $self{skip_size};
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if ($bytes != $self{header_size} +2) {
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die "$bytes != $self{header_size} +2";
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}
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my $checksum = checksum($buf_ref, $offset +2, $self{header_size});
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if ($checksum != $self{header_sum}) {
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printf("WARN: Header bytes checksum to %02lx\n",
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$checksum);
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}
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# If we are an award rom...
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if ($self{os_id} eq ' ') {
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@self{qw(zero total_checksum)} =
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unpack('CC', substr($$buf_ref,
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$offset + $self{total_size}, 2));
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if ($self{zero} != 0) {
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warn "Award ROM without trailing zero";
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}
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else {
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$self{total_size}++;
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}
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my $checksum =
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checksum($buf_ref, $offset, $self{total_size});
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if ($self{total_checksum} != $checksum) {
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printf("WARN: Image bytes checksum to %02lx\n",
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$checksum);
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}
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else {
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$self{total_size}++;
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}
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$self{rom_addr} = $self{dos_time};
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$self{rom_flags} = $self{dos_date};
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delete @self{qw(dos_time dos_date)};
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}
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}
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else {
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die "Unknown header type";
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}
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return \%self;
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}
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sub main
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{
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my ($filename, $rom_length) = @_;
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my $fd = new FileHandle;
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if (!defined($rom_length)) {
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my ($dev, $ino, $mode, $nlink, $uid, $gid,$rdev,$size,
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$atime, $mtime, $ctime, $blksize, $blocks)
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= stat($filename);
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$rom_length = $size;
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}
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$fd->open("<$filename") or die "Cannot ope $filename";
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my $data;
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$fd->read($data, $rom_length);
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$fd->close();
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my $i;
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for($i = 0; $i < $rom_length; $i++) {
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my $sig = substr($data, $i, 5);
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if (exists($lha_signatures{$sig})) {
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my $start = $i -2;
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my $header = decode_lha_header(\$data, $start);
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my $length = $header->{total_size};
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print "AT: $start - @{[$start + $length -1]}, $length bytes\n";
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print_struct(\@lha_header, $header);
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print "\n";
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}
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}
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}
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main(@ARGV);
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