bin2hex

#!/usr/local/bin/lua-5.1

-- Copyright (c) 2013 The FreeBSD Foundation
-- All rights reserved.
--
-- This software was developed by Ed Maste under sponsorship from
-- The FreeBSD Foundation.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions
-- are met:
--
-- 1. Redistributions of source code must retain the above copyright
--    notice, this list of conditions and the following disclaimer.
-- 2. Redistributions in binary form must reproduce the above copyright
--    notice, this list of conditions and the following disclaimer in the
--    documentation and/or other materials provided with the distribution.
--
-- THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
-- ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-- ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
-- FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-- LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-- OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-- SUCH DAMAGE.

-- Convert a binary 256-character font as found in /usr/share/syscons/fonts
-- to the hex format used by unifont (http://czyborra.com/unifont/)

char_width = 8
char_height = 16

if arg[1] == "-x" then
    table.remove(arg, 1)
    char_width = table.remove(arg, 1)
end
if arg[1] == "-y" then
    table.remove(arg, 1)
    char_height = table.remove(arg, 1)
end

io.write(string.format("# Width: %d\n", char_width))
io.write(string.format("# Height: %d\n", char_height))

char_width_bytes = math.ceil(char_width / 8)
char_bytes = char_width_bytes * char_height

addr = 0
f = io.open(arg[1], "rb")
buf = f:read("*all")
while buf ~= "" do
    hex = ""
    for i=1,char_bytes do
        hex = hex .. string.format('%02x', buf:byte(i))
    end
    print(string.format("%04x:", addr) .. hex)
    buf = string.sub(buf, char_bytes + 1)
    addr = addr + 1
end