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quotprindeco.c

/*
 *    fhist - file history and comparison tools
 *    Copyright (C) 2000, 2002 Peter Miller;
 *    All rights reserved.
 *
 *    This program 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 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program 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 this program; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * MANIFEST: functions to deliver output, decoding quoted printable
 */

#include <output/private.h>
#include <output/quotprindeco.h>


typedef struct output_quoted_printable_decode_ty output_quoted_printable_decode_ty;
struct output_quoted_printable_decode_ty
{
      output_ty   inherited;
      output_ty   *deeper;
      int         delete_on_delete;
      int         state;
      int         c1;
      int         n1;
};


static void
destructor(output_ty *fp)
{
      output_quoted_printable_decode_ty *this;

      this = (output_quoted_printable_decode_ty *)fp;
      switch (this->state)
      {
      case 1:
            output_fputc(this->deeper, '=');
            break;

      case 2:
            output_fputc(this->deeper, '=');
            output_fputc(this->deeper, this->c1);
            break;
      }
      this->state = 0;
      output_flush(this->deeper);
      if (this->delete_on_delete)
          output_delete(this->deeper);
      this->deeper = 0;
}


static const char *
filename(output_ty *fp)
{
      output_quoted_printable_decode_ty *this;

      this = (output_quoted_printable_decode_ty *)fp;
      return output_filename(this->deeper);
}


static long
otell(output_ty *fp)
{
      output_quoted_printable_decode_ty *this;

      this = (output_quoted_printable_decode_ty *)fp;
      return output_ftell(this->deeper);
}


static int
unhex(int c)
{
      switch (c)
      {
      case '0': case '1': case '2': case '3': case '4':
      case '5': case '6': case '7': case '8': case '9': 
            return (c - '0');

      case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': 
            return (c - 'a' + 10);

      case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': 
            return (c - 'A' + 10);
      }
      return -1;
}


static void
oputc(output_ty *fp, int c)
{
      output_quoted_printable_decode_ty *this;
      int         n;

      this = (output_quoted_printable_decode_ty *)fp;
      switch (this->state)
      {
      case 0:
            state0:
            if (c == '=')
            {
                  this->state = 1;
                  break;
            }
            output_fputc(this->deeper, c);
            break;

      case 1:
            if (c == '\n')
            {
                  this->state = 0;
                  break;
            }
            n = unhex(c);
            if (n >= 0)
            {
                  this->n1 = n;
                  this->c1 = c;
                  this->state = 2;
                  break;
            }
            output_fputc(this->deeper, '=');
            this->state = 0;
            goto state0;

      case 2:
            this->state = 0;
            n = unhex(c);
            if (n >= 0)
            {
                  output_fputc(this->deeper, (this->n1 << 4) + n);
                  break;
            }
            output_fputc(this->deeper, '=');
            output_fputc(this->deeper, this->c1);
            goto state0;
      }
}


static void
oflush(output_ty *fp)
{
      output_quoted_printable_decode_ty *this;

      this = (output_quoted_printable_decode_ty *)fp;
      output_flush(this->deeper);
}


static output_vtbl_ty vtbl =
{
      sizeof(output_quoted_printable_decode_ty),
      destructor,
      filename,
      otell,
      oputc,
      output_generic_fputs,
      output_generic_write,
      oflush,
      "quoted_printable_decode",
};


output_ty *
output_quoted_printable_decode(output_ty *deeper, int dod)
{
      output_ty   *result;
      output_quoted_printable_decode_ty *this;

      result = output_new(&vtbl);
      this = (output_quoted_printable_decode_ty *)result;
      this->deeper = deeper;
      this->delete_on_delete = dod;
      this->state = 0;
      return result;
}

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