jcs.org
Example program for the Cidco MailStation Z80 computer
1#
2# convert a hex-exported bitmap font (like from gbdfed) to an asm include file
3# Copyright (c) 2019 joshua stein <jcs@jcs.org>
4#
5# Permission to use, copy, modify, and distribute this software for any
6# purpose with or without fee is hereby granted, provided that the above
7# copyright notice and this permission notice appear in all copies.
8#
9# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16#
17
18chars = []
19char_size = 0
20all_bytes = []
21
22if !ARGV[0]
23 puts "usage: #{$0} <hex file converted from bdf>"
24 exit 1
25end
26
27File.open(ARGV[0], "r") do |f|
28 char = 0
29
30 while f && !f.eof?
31 line = f.gets
32
33 # 0023:A0E0A0E0A000
34 if !(m = line.match(/^(....):(.+)$/))
35 raise "unexpected format: #{line.inspect}"
36 end
37
38 char = m[1].to_i(16)
39 char_size = (m[2].length / 2)
40
41 # A0E0A0E0A000
42 # -> [ "A0", "e0", "A0", "e0", "A0", "00", "00" ]
43 bytes = m[2].scan(/(..)/).flatten
44
45 # -> [ 0xa0, 0xe0, 0xa0, 0xe0, 0xa0, 0x00, 0x00 ]
46 bytes = bytes.map{|c| c.to_i(16) }
47
48 # -> [ 101000000, 11100000, ... ]
49 # -> [ [ 1, 0, 1, 0, 0, 0, 0, 0 ], [ 1, 1, 1, 0, 0, 0, 0, 0 ], ... ]
50 bytes = bytes.map{|c| sprintf("%08b", c).split(//).map{|z| z.to_i } }
51
52 # -> [ [ 0, 0, 0, 0, 0, 1, 0, 1 ], [ 0, 0, 0, 0, 0, 1, 1, 1 ], ... ]
53 bytes = bytes.map{|a| a.reverse }
54
55 # -> [ 0x5, 0x7, ... ]
56 bytes = bytes.map{|a| a.join.to_i(2) }
57
58 chars[char] = bytes
59 end
60end
61
62(0 .. 255).each do |c|
63 if chars[c] && chars[c].any?
64 print ".db " << chars[c].map{|c| sprintf("#0x%02x", c) }.join(", ")
65 if c >= 32 && c <= 126
66 print "\t; #{sprintf("%.3d", c)} - #{c.chr}"
67 end
68 print "\n"
69 else
70 puts ".db " << char_size.times.map{|c| "#0x00" }.join(", ")
71 end
72end