mirror of https://github.com/digarok/gsplus.git
89 lines
1.7 KiB
Perl
89 lines
1.7 KiB
Perl
#!/usr/bin/perl -w
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use strict;
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use constant SIZEOF_HEADER => 6;
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use constant SIZEOF_ENTRY => 16;
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use Getopt::Long;
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sub load_png {
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my ($file, $width, $height) = @_;
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print "Opening $file\n";
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open(my $io, "<", $file) or return "";
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binmode $io;
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local $/;
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my $data = <$io>;
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my @header = unpack("C[8] NN NNC[5] N", $data);
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close($io);
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# png header
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return "" unless $header[0] == 0x89;
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return "" unless $header[1] == 0x50;
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return "" unless $header[2] == 0x4e;
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return "" unless $header[3] == 0x47;
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return "" unless $header[4] == 0x0d;
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return "" unless $header[5] == 0x0a;
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return "" unless $header[6] == 0x1a;
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return "" unless $header[7] == 0x0a;
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# ihdr
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return "" unless $header[8] == 0x0d;
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return "" unless $header[9] == 0x49484452;
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$$width = $header[10];
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$$height = $header[11];
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# bit depth, color type, compression method, filter method, interface method
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# crc
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return $data;
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}
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GetOptions();
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my $count = scalar @ARGV;
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die "Usage: make_ico file.png ..." unless $count;
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open(my $ico, ">", "icon.ico") or die "unable to open icon.ico";
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binmode $ico;
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my $height = 0;
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my $width = 0;
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my $size = 0;
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my $offset = SIZEOF_HEADER + SIZEOF_ENTRY * $count;
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my $header = pack("vvv", 0, 1, $count);
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my $entry = "";
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seek $ico, $offset, 0;
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foreach my $file (@ARGV) {
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my $data = load_png($file, \$height, \$width);
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my $size = length($data);
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die "Icon too large ($file)" if ($height > 256 || $width > 256);
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$height = 0 if ($height == 256);
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$width = 0 if ($width == 256);
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$entry = $entry . pack("CCCCvvVV", $width, $height, 0, 0, 0, 0, $size, $offset);
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$offset += $size;
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print $ico $data;
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}
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seek $ico, 0, 0;
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print $ico $header;
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print $ico $entry;
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close($ico);
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exit 0;
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