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%   Change file for the PKtoGF processor, for use on System V UNIX

% History:
%
% First release at PKtoGF Version 0.0 January,1988
% 
% Changed version number for version 1.0 January 27, 1988 (P. MacKay)
% 

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [0] WEAVE: print changes only
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
% System V version adapted from BSD version by P. MacKay
% Hope it works, I can't test it.
\pageno=\contentspagenumber \advance\pageno by 1
@y
\pageno=\contentspagenumber \advance\pageno by 1
\let\maybe=\iffalse
\def\title{PK\lowercase{to}GF changes for System V {\mc UNIX}}
@z
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [2] Change banner string
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@d banner=='This is PKtoGF, Version 1.0' 
@y
@d banner=='This is PKtoGF, Version 1.0 for System V UNIX'
@z

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [4] Add #include PKtoGF_ext.h to main
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@p program PKtoGF(input, output);
label @<Labels in the outer block@>@/
const @<Constants in the outer block@>@/
type @<Types in the outer block@>@/
var @<Globals in the outer block@>@/
procedure initialize; {this procedure gets things started properly}
@y
@p program PKtoGF(input, output);
label @<Labels in the outer block@>@/
const @<Constants in the outer block@>@/
type @<Types in the outer block@>@/
var @<Globals in the outer block@>@/
@\@=#include "pktogf_ext.h"@>@\
procedure initialize; {this procedure gets things started properly}
@z

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [6] change name_length to file_name_size, update to 256
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@!name_length=80; {maximum length of a file name}
@y
@!file_name_size=256; {maximum length of a file name}
@z

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [27] change byte_file, add UNIX_file_name, change word_file type
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@!eight_bits=0..255; {packed file byte}
@!byte_file=packed file of eight_bits ; {for packed file words}
@y
@!eight_bits=0..255; {packed file byte}
@!UNIX_file_name=packed array [1..file_name_size] of char;
@!byte_file=record@/
stdio_ptr: ^integer; {pointer for stdio FILE struct}
loc_ptr: ^integer; {pointer to byte position ptr to keep in sync with file}
file_name: UNIX_file_name; {file name saved by open routines}
end;
@z

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [29] redefine open_gf_file and open_pk_file; add filename generation
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@p procedure open_gf_file; {prepares to write packed bytes in a |gf_file|}
begin rewrite(gf_file,gf_name);
gf_loc := 0 ;
end;
@#
procedure open_pk_file; {prepares the input for reading}
begin reset(pk_file,pk_name);
pk_loc := 0 ;
end;
@y
@d NO_search_path=0

@p procedure open_gf_file; {prepares to write packed bytes in a |gf_file|}
var i, j, k, name_len: integer;

begin
if argc < 3 then begin@/
    j := file_name_size;@/
    while (j > 1) and (pk_name[j] <> '/') do@/
        decr(j);
    if (pk_name[j] = '/') then incr(j);  { to avoid picking up the / }
    name_len := 1;@/
    while (j < file_name_size)
    and (not (pk_name[j] = '.') or (pk_name[j] = ' ')) do begin @/
	gf_name[name_len] := pk_name[j];
	incr(name_len); incr(j);
    end;
    gf_name[name_len] := '.'; incr(name_len); incr(j);@/
    while (j < file_name_size)
    and (not (pk_name[j] = 'p') or (pk_name[j] = ' ')) do begin @/
	gf_name[name_len] := pk_name[j];
	incr(name_len); incr(j);
    end;
   gf_name[name_len] := 'g'; incr(name_len);@/
   gf_name[name_len] := 'f'; incr(name_len);@/
   gf_name[name_len] := ' ';@/
   print_ln('[Output file named ''', gf_name:name_len-1, ''']');@/
end;
if not b_open_out(gf_file, gf_name) then begin@/
   i:=1;
   while (i < file_name_size) and (gf_name[i] <> ' ') do@/
      incr(i);
   abort('Error opening GF output file: ', gf_name:i);
end;
gf_loc := 0 ;
end;
@#
procedure open_pk_file; {prepares the input for reading}
var i: integer;
begin
if not b_open_in(pk_file, pk_name, NO_search_path) then begin@/
    i:=1;
    while (i < file_name_size) and (pk_name[i] <> ' ') do@/
        incr(i);
    abort('Unable to open PK input file: ', pk_name:i);
end;
b_set_ptr(pk_file, pk_loc);@/
pk_loc := 0 ;
end;
@z

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [30] redefine gf_name and pk_name types
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@!gf_name,@!pk_name:packed array[1..name_length] of char; {names of input
@y
@!gf_name,@!pk_name:UNIX_file_name; {names of input
@z

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [31] redefine gf_byte to use our routines.  
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@p procedure gf_byte (i : integer) ;
begin gf_file^ := i ;
put(gf_file) ;
incr(gf_loc) ;
end;

@y
@d gf_byte(#)==begin b_write_byte(gf_file,#); incr(gf_loc) end
@z

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [32] redefine pk_byte
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@p function pk_byte : eight_bits ;
var nybble, temp : eight_bits ;
begin 
   temp := pk_file^ ;
   get(pk_file) ;
   pk_loc := pk_loc + 1 ;
   pk_byte := temp ;
end ;
@y
@d pk_byte==b_read_unsigned(pk_file)
@z

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [33] reorder file opens so we have magnification available for
%	building output file name before we call open_gf_file
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%@x
%open_pk_file ;
%open_gf_file ;
%pixel_integer(gf_id)
%@y
%open_pk_file ;@/
%@<Read preamble@>;@/
%open_gf_file ;@/
%pixel_integer(gf_id)
%@z

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [34] redefine get_16 and get_32
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@p function signed_byte : integer ;
var a : integer ;
begin
   a := pk_byte ;
   if a > 127 then
      a := a - 256 ;
   signed_byte := a ;
end ;
@#
function get_16 : integer ;
var a : integer ;
begin
   a := pk_byte ;
   get_16 := a * 256 + pk_byte ; 
end ;
@#
function signed_16 : integer ;
var a : integer ;
begin
   a := signed_byte ;
   signed_16 := a * 256 + pk_byte ;
end ;
@#
function get_32 : integer ;
var a : integer ;
begin 
   a := get_16 ; 
   if a > 32767 then a := a - 65536 ;
   get_32 := a * 65536 + get_16 ; 
end ;
@y
@d get_16==b_read_2_unsigned(pk_file)
@d get_32==b_read_4_signed(pk_file)

@p function signed_byte : integer ;
var a : integer ;
begin
   a := b_read_unsigned(pk_file);
   if a > 127 then
      a := a - 256 ;
   signed_byte := a ;
end ;
@#
function signed_16 : integer ;
var a : integer ;
begin
   a := signed_byte ;
   signed_16 := a * 256 + pk_byte ;
end ;

@z

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [58] recode dialog to decode command line arguments
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
@ @p procedure dialog ;
var i : integer ; {index variable}
buffer : packed array [1..name_length] of char; {input buffer}
begin
   for i := 1 to name_length do begin
      gf_name[i] := ' ' ;
      pk_name[i] := ' ' ;
   end; 
   print('Input file name:  ') ;
   flush_buffer ;
   get_line(pk_name) ;
   print('Output file name:  ') ;
   flush_buffer ;
   get_line(gf_name) ;
end ;
@y
@ @p procedure dialog ;
var i : integer ; {index variable}
begin
   for i := 1 to file_name_size do begin
      gf_name[i] := ' ' ;
      pk_name[i] := ' ' ;
   end; 
   if (argc < 2) or (argc > 3) then
      abort('Usage: PKtoGF PK-file [GF-file]');
   argv(2, pk_name);@/
   if (argc > 2) then
      argv(3, gf_name);@/
end ;
@z

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [59] change eof() to b_eof()
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@x
while not eof(pk_file) do i := pk_byte ;
@y
while not b_eof(pk_file) do i := pk_byte ;
@z
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