/* GNU Mailutils -- a suite of utilities for electronic mail
   Copyright (C) 1999-2021 Free Software Foundation, Inc.

   GNU Mailutils is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   GNU Mailutils is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>. */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <unistd.h>
#include <stdio.h>
#include <assert.h>
#include <ctype.h>
#include <string.h>
#include <mailutils/mailutils.h>

#define ISPRINT(c) ((c)>=' '&&(c)<127) 

int verbose = 0;
int printable = 0;

static void
c_copy (mu_stream_t out, mu_stream_t in)
{
  mu_stream_stat_buffer instat, outstat;

  if (verbose)
    {
      mu_stream_set_stat (in,
			  MU_STREAM_STAT_MASK (MU_STREAM_STAT_IN) |
			  MU_STREAM_STAT_MASK (MU_STREAM_STAT_READS) |
			  MU_STREAM_STAT_MASK (MU_STREAM_STAT_SEEKS),
			  instat);
      mu_stream_set_stat (out,
			  MU_STREAM_STAT_MASK (MU_STREAM_STAT_OUT) |
			  MU_STREAM_STAT_MASK (MU_STREAM_STAT_WRITES) |
			  MU_STREAM_STAT_MASK (MU_STREAM_STAT_SEEKS),
			  outstat);
    }

  if (printable)
    {
      char c;
      size_t size;
      
      while (mu_stream_read (in, &c, 1, &size) == 0 && size > 0)
	{
	  if (printable && !ISPRINT (c))
	    {
	      char outbuf[24];
	      sprintf (outbuf, "\\%03o", (unsigned char) c);
	      MU_ASSERT (mu_stream_write (out, outbuf, strlen (outbuf), NULL));
	    }
	  else
	    MU_ASSERT (mu_stream_write (out, &c, 1, NULL));
	}
    }
  else
    MU_ASSERT (mu_stream_copy (out, in, 0, NULL));
  mu_stream_write (out, "\n", 1, NULL);
  mu_stream_close (out);
  mu_stream_close (in);
  if (verbose)
    {
      fprintf (stderr, "\nInput stats:\n");
      fprintf (stderr, "Bytes in: %lu\n",
	       (unsigned long) instat[MU_STREAM_STAT_IN]);
      fprintf (stderr, "Reads: %lu\n",
	       (unsigned long) instat[MU_STREAM_STAT_READS]);
      fprintf (stderr, "Seeks: %lu\n",
	       (unsigned long) instat[MU_STREAM_STAT_SEEKS]);

      fprintf (stderr, "\nOutput stats:\n");
      fprintf (stderr, "Bytes out: %lu\n",
	       (unsigned long) outstat[MU_STREAM_STAT_OUT]);
      fprintf (stderr, "Writes: %lu\n",
	       (unsigned long) outstat[MU_STREAM_STAT_WRITES]);
      fprintf (stderr, "Seeks: %lu\n",
	       (unsigned long) outstat[MU_STREAM_STAT_SEEKS]);
    }
}

int
main (int argc, char * argv [])
{
  mu_stream_t in, out, flt;
  int c;
  int mode = MU_FILTER_ENCODE;
  int flags = MU_STREAM_READ;
  char *input = NULL, *output = NULL;
  char *encoding = "base64";
  mu_off_t shift = 0;
  char *line_length_option = NULL;
  char *fargv[5];
  size_t fargc = 0;
  
  while ((c = getopt (argc, argv, "deE:hi:l:o:ps:vw")) != EOF)
    switch (c)
      {
      case 'i':
	input = optarg;
	break;

      case 'o':
	output = optarg;
	break;
	
      case 'd':
	mode = MU_FILTER_DECODE;
	break;

      case 'E':
	encoding = optarg;
	break;
	
      case 'e':
	mode = MU_FILTER_ENCODE;
	break;

      case 'l':
	line_length_option = optarg;
	break;
	
      case 'p':
 	printable = 1;
	break;

      case 's':
	shift = strtoul (optarg, NULL, 0); 
	break;
	
      case 'v':
	verbose = 1;
	break;

      case 'h':
	printf ("usage: base64 [-vpde][-E encoding][-i infile][-o outfile]\n");
	exit (0);

      case 'w':
	flags = MU_STREAM_WRITE;
	break;
	
      default:
	exit (1);
      }

  if (input)
    MU_ASSERT (mu_file_stream_create (&in, input, MU_STREAM_READ|MU_STREAM_SEEK));
  else
    MU_ASSERT (mu_stdio_stream_create (&in, MU_STDIN_FD, 0));

  if (output)
    MU_ASSERT (mu_file_stream_create (&out, output, 
                                      MU_STREAM_WRITE|MU_STREAM_CREAT));
  else
    MU_ASSERT (mu_stdio_stream_create (&out, MU_STDOUT_FD, 0));

  fargv[fargc++] = encoding;
  if (line_length_option && strcmp (line_length_option, "0"))
    {
      if (mu_c_strcasecmp (encoding, "base64") == 0)
	fargv[0] = "B"; /* B encoding has no length limit */
      fargv[fargc++] = "+";
      fargv[fargc++] = (mode == MU_FILTER_DECODE) ? "~linelen" : "linelen";
      fargv[fargc++] = line_length_option;
    }
  fargv[fargc] = NULL;
  
  if (flags == MU_STREAM_READ)
    {
      MU_ASSERT (mu_filter_chain_create (&flt, in, mode,
					 MU_STREAM_READ|MU_STREAM_SEEK,
					 fargc, fargv));
      mu_stream_unref (in);
      if (shift)
	MU_ASSERT (mu_stream_seek (flt, shift, MU_SEEK_SET, NULL));
      c_copy (out, flt);
    }
  else
    {
      MU_ASSERT (mu_filter_chain_create (&flt, out, mode,
					 MU_STREAM_WRITE,
					 fargc, fargv));
      mu_stream_unref (out);
      if (shift)
	MU_ASSERT (mu_stream_seek (in, shift, MU_SEEK_SET, NULL));
      c_copy (flt, in);
    }
      
  return 0;
}