#!/usr/bin/perl

#
# Convert a text version of a .BN file into a -pb.od file

# Basically, it's just a "text" file with the standard
# 3 bytes in 2 words format.

@todo = @ARGV;
foreach $f (@todo) {
  $of = $f; $of =~ y/A-Z/a-z/;
  $of =~ s/\.htm$//;
  $of =~ s/-bn$/-pb.od/;
  if (-f $of) {
    warn "Skipping $of: exists\n";
    next;
  }
  open(OUTPUT, ">$of") || die "$of: $!";
  print "Writing $of\n";
  open(INPUT, $f) || die "$f: $!";
  $eof = 0;
  while (<INPUT>) {
    # The lines we care about have an octal offset, colon, then 16 values.
    if (s/^(\d+): //) {
      # Pick up the words, two at a time.
      while (s/^(\d+)\s+(\d+)\s+//) {
        @w = (oct($1), oct($2)); 
        push(@w, (($w[0]&07400)>>4) + ($w[1]>>8));
        $w[0] &= 0377;
        $w[1] &= 0377;
        # Now output 3 bytes, or until \0232 is found.
        $eof = 1 if $w[0] == 0232;
        printf OUTPUT "%04o\n", $w[0] unless $eof;
        $eof = 1 if $w[1] == 0232;
        printf OUTPUT "%04o\n", $w[1] unless $eof;
        $eof = 1 if $w[2] == 0232;
        printf OUTPUT "%04o\n", $w[2] unless $eof;
      }
    }
  }
  close(OUTPUT) || die "$of: $!";
}
exit 0;