/*
 * Copyright (C) 1996-8 Michael R. Elkins <me@cs.hmc.edu>
 * 
 *     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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */ 

#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <sys/wait.h>
#include <sys/stat.h>

#include "mutt.h"
#include "mutt_curses.h"
#include "rfc1524.h"
#include "keymap.h"
#include "mime.h"
#include "copy.h"
#include "charset.h"






typedef void handler_f (BODY *, STATE *);
typedef handler_f *handler_t;

int Index_hex[128] = {
    -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
    -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
    -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
     0, 1, 2, 3,  4, 5, 6, 7,  8, 9,-1,-1, -1,-1,-1,-1,
    -1,10,11,12, 13,14,15,-1, -1,-1,-1,-1, -1,-1,-1,-1,
    -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
    -1,10,11,12, 13,14,15,-1, -1,-1,-1,-1, -1,-1,-1,-1,
    -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1
};

int Index_64[128] = {
    -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
    -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
    -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
    52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1,-1,-1,-1,
    -1, 0, 1, 2,  3, 4, 5, 6,  7, 8, 9,10, 11,12,13,14,
    15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
    -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
    41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
};

static void state_maybe_utf8_putc(STATE *s, char c, int is_utf8, CHARSET *chs, CHARSET_MAP *map)
{
  if(is_utf8)
    state_fput_utf8(s, c, chs);
  else
    state_prefix_putc(mutt_display_char ((unsigned char) c, map), s);
}

void mutt_decode_xbit (STATE *s, BODY *b, int istext)
{
  long len = b->length;
  int c, ch;
  
  if (istext)
  {
    CHARSET_MAP *map = NULL;
    CHARSET *chs = NULL;
    char *charset = mutt_get_parameter("charset", b->parameter);
    int is_utf8;

    if((is_utf8 = (mutt_is_utf8(charset) && !mutt_is_utf8(Charset))))
      chs = mutt_get_charset(Charset);
    else
      map = mutt_get_translation(charset, Charset);

    state_set_prefix(s);
    
    while ((c = fgetc(s->fpin)) != EOF && len--)
    {
      if(c == '\r' && len)
      {
	if((ch = fgetc(s->fpin)) == '\n')
	{
	  c = ch;
	  len--;
	}
	else 
	  ungetc(ch, s->fpin);
      }
	
      state_maybe_utf8_putc(s, c, is_utf8, chs, map);
    }
    
    state_reset_prefix(s);

    if(is_utf8)
      state_fput_utf8(s, '\0', chs);
    
  }
  else
    mutt_copy_bytes (s->fpin, s->fpout, len);
}

static int handler_state_fgetc(STATE *s)
{
  int ch;
  
  if((ch = fgetc(s->fpin)) == EOF)
  {
    dprint(1, (debugfile, "handler_state_fgetc: unexpected EOF.\n"));
    state_puts (_("[-- Error: unexpected end of file! --]\n"), s);
  }
  return ch;
}

void mutt_decode_quoted (STATE *s, BODY *b, int istext)
{
  long len = b->length;
  int ch;
  char *charset = mutt_get_parameter("charset", b->parameter);
  int is_utf8 = 0;
  CHARSET *chs = NULL;
  CHARSET_MAP *map = NULL;
  
  if(istext)
  {
    if((is_utf8 = (mutt_is_utf8(charset) && !mutt_is_utf8(Charset))))
      chs = mutt_get_charset(Charset);
    else
      map = mutt_get_translation(charset, Charset);
  }
  
  state_set_prefix(s);
  
  while (len > 0)
  {
    if ((ch = handler_state_fgetc(s)) == EOF)
      break;

    len--;
    
    if (ch == '=')
    {
      int ch1, ch2;
      
      if(!len || (ch1 = handler_state_fgetc(s)) == EOF)
	break;

      len--;
      
      if (ch1 == '\n' || ch1 == '\r' || ch1 == ' ' || ch1 == '\t')
      {
	/* Skip whitespace at the end of the line since MIME does not
	 * allow for it
	 */
	if(ch1 != '\n')
	{
	  while(len && (ch1 = handler_state_fgetc(s)) != EOF)
	  {
	    len--;
	    if(ch1 == '\n')
	      break;
	  }
	}

	if(ch1 == EOF)
	  break;

	ch = EOF;

      }
      else
      {
	if(!len || (ch2 = handler_state_fgetc(s)) == EOF)
	  break;

	len--;
	
        ch = hexval (ch1) << 4;
        ch |= hexval (ch2);
      }
    } /* ch == '=' */
    else if (istext && ch == '\r')
    {
      continue;
    }
    if(ch != EOF)
      state_maybe_utf8_putc(s, ch, is_utf8, chs, map);
  }
  
  state_reset_prefix(s);

  if(is_utf8)
    state_fput_utf8(s, '\0', chs);
}

void mutt_decode_base64 (STATE *s, BODY *b, int istext)
{
  long len = b->length;
  char buf[5];
  int c1, c2, c3, c4, ch, cr = 0, i;
  char *charset = mutt_get_parameter("charset", b->parameter);
  CHARSET_MAP *map = NULL;
  CHARSET *chs = NULL;
  int is_utf8 = 0;

  if(istext)
  {
    if((is_utf8 = (mutt_is_utf8(charset) && !mutt_is_utf8(Charset))))
      chs = mutt_get_charset(Charset);
    else
      map = mutt_get_translation(charset, Charset);
  }
  
  buf[4] = 0;

  if (istext) state_set_prefix(s);

  while (len > 0)
  {
    for (i = 0 ; i < 4 && len > 0 ; len--)
    {
      if ((ch = fgetc (s->fpin)) == EOF)
	return;
      if (!ISSPACE (ch))
	buf[i++] = ch;
    }
    if (i != 4)
      return; /* didn't get a multiple of four chars! */

    c1 = base64val (buf[0]);
    c2 = base64val (buf[1]);
    ch = (c1 << 2) | (c2 >> 4);

    if (cr && ch != '\n') 
      state_maybe_utf8_putc(s, '\r', is_utf8, chs, map);
    cr = 0;
      
    if (istext && ch == '\r')
      cr = 1;
    else
      state_maybe_utf8_putc(s, ch, is_utf8, chs, map);

    if (buf[2] == '=')
      break;
    c3 = base64val (buf[2]);
    ch = ((c2 & 0xf) << 4) | (c3 >> 2);

    if (cr && ch != '\n')
      state_maybe_utf8_putc(s, ch, is_utf8, chs, map);

    cr = 0;

    if (istext && ch == '\r')
      cr = 1;
    else
      state_maybe_utf8_putc(s, ch, is_utf8, chs, map);

    if (buf[3] == '=') break;
    c4 = base64val (buf[3]);
    ch = ((c3 & 0x3) << 6) | c4;

    if (cr && ch != '\n')
      state_maybe_utf8_putc(s, ch, is_utf8, chs, map);
    cr = 0;

    if (istext && ch == '\r')
      cr = 1;
    else
      state_maybe_utf8_putc(s, ch, is_utf8, chs, map);
  }
  state_reset_prefix(s);
}

unsigned char decode_byte (char ch)
{
  if (ch == 96)
    return 0;
  return ch - 32;
}

void mutt_decode_uuencoded (STATE *s, BODY *b, int istext)
{
  char tmps[SHORT_STRING];
  char linelen, c, l, out;
  char *pt;
  CHARSET_MAP *map = NULL;
  CHARSET *chs = NULL;
  char *charset = mutt_get_parameter("charset", b->parameter);
  int is_utf8 = 0;
  long len = b->length;
  
  if(istext && (is_utf8 = (mutt_is_utf8(charset) && !mutt_is_utf8(Charset))))
    chs = mutt_get_charset(Charset);
  else
    map = mutt_get_translation(charset, Charset);

  if(istext)
    state_set_prefix(s);
  
  while(len > 0)
  {
    if ((fgets(tmps, sizeof(tmps), s->fpin)) == NULL)
      return;
    len -= mutt_strlen(tmps);
    if ((!mutt_strncmp (tmps, "begin", 5)) && ISSPACE (tmps[5]))
      break;
  }
  while(len > 0)
  {
    if ((fgets(tmps, sizeof(tmps), s->fpin)) == NULL)
      return;
    len -= mutt_strlen(tmps);
    if (!mutt_strncmp (tmps, "end", 3))
      break;
    pt = tmps;
    linelen = decode_byte (*pt);
    pt++;
    for (c = 0; c < linelen;)
    {
      for (l = 2; l <= 6; l += 2)
      {
	out = decode_byte (*pt) << l;
	pt++;
	out |= (decode_byte (*pt) >> (6 - l));
	state_maybe_utf8_putc(s, out, is_utf8, chs, map);
	c++;
	if (c == linelen)
	  break;
      }
      pt++;
    }
  }
  
  state_reset_prefix(s);
  if(is_utf8)
    state_fput_utf8(s, '\0', chs);
  
}

/* ----------------------------------------------------------------------------
 * A (not so) minimal implementation of RFC1563.
 */

#define IndentSize (4)
    
enum { RICH_PARAM=0, RICH_BOLD, RICH_UNDERLINE, RICH_ITALIC, RICH_NOFILL, 
  RICH_INDENT, RICH_INDENT_RIGHT, RICH_EXCERPT, RICH_CENTER, RICH_FLUSHLEFT,
  RICH_FLUSHRIGHT, RICH_COLOR, RICH_LAST_TAG };

static struct {
  const char *tag_name;
  int index;
} EnrichedTags[] = {
  { "param",		RICH_PARAM },
  { "bold",		RICH_BOLD },
  { "italic",		RICH_ITALIC },
  { "underline",	RICH_UNDERLINE },
  { "nofill",		RICH_NOFILL },
  { "excerpt",		RICH_EXCERPT },
  { "indent",		RICH_INDENT },
  { "indentright",	RICH_INDENT_RIGHT },
  { "center",		RICH_CENTER },
  { "flushleft",	RICH_FLUSHLEFT },
  { "flushright",	RICH_FLUSHRIGHT },
  { "flushboth",	RICH_FLUSHLEFT },
  { "color",		RICH_COLOR },
  { "x-color",		RICH_COLOR },
  { NULL,		-1 }
};

struct enriched_state
{
  char *buffer;
  char *line;
  char *param;
  size_t buff_len;
  size_t line_len;
  size_t line_used;
  size_t line_max;
  size_t indent_len;
  size_t word_len;
  size_t buff_used;
  size_t param_len;
  int tag_level[RICH_LAST_TAG];
  int WrapMargin;
  STATE *s;
};

static void enriched_wrap (struct enriched_state *stte)
{
  int x;
  int extra;

  if (stte->line_len)
  {
    if (stte->tag_level[RICH_CENTER] || stte->tag_level[RICH_FLUSHRIGHT])
    {
      /* Strip trailing white space */
      size_t y = stte->line_used - 1;

      while (y && ISSPACE (stte->line[y]))
      {
	stte->line[y] = '\0';
	y--;
	stte->line_used--;
	stte->line_len--;
      }
      if (stte->tag_level[RICH_CENTER])
      {
	/* Strip leading whitespace */
	y = 0;

	while (stte->line[y] && ISSPACE (stte->line[y]))
	  y++;
	if (y)
	{
	  size_t z;

	  for (z = y ; z <= stte->line_used; z++)
	  {
	    stte->line[z - y] = stte->line[z];
	  }

	  stte->line_len -= y;
	  stte->line_used -= y;
	}
      }
    }

    extra = stte->WrapMargin - stte->line_len - stte->indent_len -
      (stte->tag_level[RICH_INDENT_RIGHT] * IndentSize);
    if (extra > 0) 
    {
      if (stte->tag_level[RICH_CENTER]) 
      {
	x = extra / 2;
	while (x)
	{
	  state_putc (' ', stte->s);
	  x--;
	}
      } 
      else if (stte->tag_level[RICH_FLUSHRIGHT])
      {
	x = extra-1;
	while (x)
	{
	  state_putc (' ', stte->s);
	  x--;
	}
      }
    }
    state_puts (stte->line, stte->s);
  }

  state_putc ('\n', stte->s);
  stte->line[0] = '\0';
  stte->line_len = 0;
  stte->line_used = 0;
  stte->indent_len = 0;
  if (stte->s->prefix)
  {
    state_puts (stte->s->prefix, stte->s);
    stte->indent_len += mutt_strlen (stte->s->prefix);
  }

  if (stte->tag_level[RICH_EXCERPT])
  {
    x = stte->tag_level[RICH_EXCERPT];
    while (x) 
    {
      if (stte->s->prefix)
      {
	state_puts (stte->s->prefix, stte->s);
	    stte->indent_len += mutt_strlen (stte->s->prefix);
      }
      else
      {
	state_puts ("> ", stte->s);
	stte->indent_len += mutt_strlen ("> ");
      }
      x--;
    }
  }
  else
    stte->indent_len = 0;
  if (stte->tag_level[RICH_INDENT])
  {
    x = stte->tag_level[RICH_INDENT] * IndentSize;
    stte->indent_len += x;
    while (x) 
    {
      state_putc (' ', stte->s);
      x--;
    }
  }
}

static void enriched_flush (struct enriched_state *stte, int wrap)
{
  if (!stte->tag_level[RICH_NOFILL] && (stte->line_len + stte->word_len > 
      (stte->WrapMargin - (stte->tag_level[RICH_INDENT_RIGHT] * IndentSize) - 
       stte->indent_len)))
    enriched_wrap (stte);

  if (stte->buff_used)
  {
    stte->buffer[stte->buff_used] = '\0';
    stte->line_used += stte->buff_used;
    if (stte->line_used > stte->line_max)
    {
      stte->line_max = stte->line_used;
      safe_realloc ((void **) &stte->line, stte->line_max + 1);
    }
    strcat (stte->line, stte->buffer);
    stte->line_len += stte->word_len;
    stte->word_len = 0;
    stte->buff_used = 0;
  }
  if (wrap) 
    enriched_wrap(stte);
}


static void enriched_putc (int c, struct enriched_state *stte)
{
  if (stte->tag_level[RICH_PARAM]) 
  {
    if (stte->tag_level[RICH_COLOR]) 
    {
      stte->param[stte->param_len++] = c;
    }
    return; /* nothing to do */
  }

  /* see if more space is needed (plus extra for possible rich characters) */
  if (stte->buff_len < stte->buff_used + 3)
  {
    stte->buff_len += LONG_STRING;
    safe_realloc ((void **) &stte->buffer, stte->buff_len + 1);
  }

  if ((!stte->tag_level[RICH_NOFILL] && ISSPACE (c)) || c == '\0' )
  {
    if (c == '\t')
      stte->word_len += 8 - (stte->line_len + stte->word_len) % 8;
    else
      stte->word_len++;
    
    stte->buffer[stte->buff_used++] = c;
    enriched_flush (stte, 0);
  }
  else
  {
    if (stte->s->flags & M_DISPLAY)
    {
      if (stte->tag_level[RICH_BOLD])
      {
	stte->buffer[stte->buff_used++] = c;
	stte->buffer[stte->buff_used++] = '\010';
	stte->buffer[stte->buff_used++] = c;
      }
      else if (stte->tag_level[RICH_UNDERLINE])
      {

	stte->buffer[stte->buff_used++] = '_';
	stte->buffer[stte->buff_used++] = '\010';
	stte->buffer[stte->buff_used++] = c;
      }
      else if (stte->tag_level[RICH_ITALIC])
      {
	stte->buffer[stte->buff_used++] = c;
	stte->buffer[stte->buff_used++] = '\010';
	stte->buffer[stte->buff_used++] = '_';
      }
      else
      {
	stte->buffer[stte->buff_used++] = c;
      }
    }
    else
    {
      stte->buffer[stte->buff_used++] = c;
    }
    stte->word_len++;
  }
}

static void enriched_puts (char *s, struct enriched_state *stte)
{
  char *c;

  if (stte->buff_len < stte->buff_used + mutt_strlen(s))
  {
    stte->buff_len += LONG_STRING;
    safe_realloc ((void **) &stte->buffer, stte->buff_len + 1);
  }
  c = s;
  while (*c)
  {
    stte->buffer[stte->buff_used++] = *c;
    c++;
  }
}

static void enriched_set_flags (const char *tag, struct enriched_state *stte)
{
  const char *tagptr = tag;
  int i, j;

  if (*tagptr == '/')
    tagptr++;
  
  for (i = 0, j = -1; EnrichedTags[i].tag_name; i++)
    if (mutt_strcasecmp (EnrichedTags[i].tag_name,tagptr) == 0)
    {
      j = EnrichedTags[i].index;
      break;
    }

  if (j != -1)
  {
    if (j == RICH_CENTER || j == RICH_FLUSHLEFT || j == RICH_FLUSHRIGHT)
      enriched_flush (stte, 1);

    if (*tag == '/')
    {
      if (stte->tag_level[j]) /* make sure not to go negative */
	stte->tag_level[j]--;
      if ((stte->s->flags & M_DISPLAY) && j == RICH_PARAM && stte->tag_level[RICH_COLOR])
      {
	stte->param[stte->param_len] = '\0';
	if (!mutt_strcasecmp(stte->param, "black"))
	{
	  enriched_puts("\033[30m", stte);
	}
	else if (!mutt_strcasecmp(stte->param, "red"))
	{
	  enriched_puts("\033[31m", stte);
	}
	else if (!mutt_strcasecmp(stte->param, "green"))
	{
	  enriched_puts("\033[32m", stte);
	}
	else if (!mutt_strcasecmp(stte->param, "yellow"))
	{
	  enriched_puts("\033[33m", stte);
	}
	else if (!mutt_strcasecmp(stte->param, "blue"))
	{
	  enriched_puts("\033[34m", stte);
	}
	else if (!mutt_strcasecmp(stte->param, "magenta"))
	{
	  enriched_puts("\033[35m", stte);
	}
	else if (!mutt_strcasecmp(stte->param, "cyan"))
	{
	  enriched_puts("\033[36m", stte);
	}
	else if (!mutt_strcasecmp(stte->param, "white"))
	{
	  enriched_puts("\033[37m", stte);
	}
	stte->param_len = 0;
	stte->param[0] = '\0';
      }
      if ((stte->s->flags & M_DISPLAY) && j == RICH_COLOR)
      {
	enriched_puts("\033[0m", stte);
      }
    }
    else
      stte->tag_level[j]++;

    if (j == RICH_EXCERPT)
      enriched_flush(stte, 1);
  }
}

void text_enriched_handler (BODY *a, STATE *s)
{
  enum {
    TEXT, LANGLE, TAG, BOGUS_TAG, NEWLINE, ST_EOF, DONE
  } state = TEXT;

  long bytes = a->length;
  struct enriched_state stte;
  int c = 0;
  int tag_len = 0;
  char tag[LONG_STRING + 1];

  memset (&stte, 0, sizeof (stte));
  stte.s = s;
  stte.WrapMargin = ((s->flags & M_DISPLAY) ? (COLS-4) : ((COLS-4)<72)?(COLS-4):72);
  stte.line_max = stte.WrapMargin * 4;
  stte.line = (char *) safe_calloc (1, stte.line_max + 1);
  stte.param = (char *) safe_calloc (1, STRING);

  if (s->prefix)
  {
    state_puts (s->prefix, s);
    stte.indent_len += mutt_strlen (s->prefix);
  }

  while (state != DONE)
  {
    if (state != ST_EOF)
    {
      if (!bytes || (c = fgetc (s->fpin)) == EOF)
	state = ST_EOF;
      else
	bytes--;
    }

    switch (state)
    {
      case TEXT :
	switch (c)
	{
	  case '<' :
	    state = LANGLE;
	    break;

	  case '\n' :
	    if (stte.tag_level[RICH_NOFILL])
	    {
	      enriched_flush (&stte, 1);
	    }
	    else 
	    {
	      enriched_putc (' ', &stte);
	      state = NEWLINE;
	    }
	    break;

	  default:
	    enriched_putc (c, &stte);
	}
	break;

      case LANGLE :
	if (c == '<')
	{
	  enriched_putc (c, &stte);
	  state = TEXT;
	  break;
	}
	else
	{
	  tag_len = 0;
	  state = TAG;
	}
	/* Yes, fall through (it wasn't a <<, so this char is first in TAG) */
      case TAG :
	if (c == '>')
	{
	  tag[tag_len] = '\0';
	  enriched_set_flags (tag, &stte);
	  state = TEXT;
	}
	else if (tag_len < LONG_STRING)  /* ignore overly long tags */
	  tag[tag_len++] = c;
	else
	  state = BOGUS_TAG;
	break;

      case BOGUS_TAG :
	if (c == '>')
	  state = TEXT;
	break;

      case NEWLINE :
	if (c == '\n')
	  enriched_flush (&stte, 1);
	else
	{
	  ungetc (c, s->fpin);
	  bytes++;
	  state = TEXT;
	}
	break;

      case ST_EOF :
	enriched_putc ('\0', &stte);
        enriched_flush (&stte, 1);
	state = DONE;
	break;

      case DONE: /* not reached, but gcc complains if this is absent */
	break;
    }
  }

  state_putc ('\n', s); /* add a final newline */

  FREE (&(stte.buffer));
  FREE (&(stte.line));
  FREE (&(stte.param));
}                                                                              

#define TXTHTML     1
#define TXTPLAIN    2
#define TXTENRICHED 3

static void alternative_handler (BODY *a, STATE *s)
{
  BODY *choice = NULL;
  BODY *b;
  LIST *t;
  char buf[STRING];
  int type = 0;

  /* First, search list of prefered types */
  t = AlternativeOrderList;
  while (t && !choice)
  {
    char *c;
    int btlen;  /* length of basetype */
    int wild;	/* do we have a wildcard to match all subtypes? */

    c = strchr (t->data, '/');
    if (c)
    {
      wild = (c[1] == '*' && c[2] == 0);
      btlen = c - t->data;
    }
    else
    {
      wild = 1;
      btlen = mutt_strlen (t->data);
    }

    if (a && a->parts) 
      b = a->parts;
    else
      b = a;
    while (b)
    {
      const char *bt = TYPE(b);
      if (!mutt_strncasecmp (bt, t->data, btlen) && bt[btlen] == 0)
      {
	/* the basetype matches */
	if (wild || !mutt_strcasecmp (t->data + btlen + 1, b->subtype))
	{
	  choice = b;
	}
      }
      b = b->next;
    }
    t = t->next;
  }

  /* Next, look for an autoviewable type */
  if (!choice)
  {
    if (a && a->parts) 
      b = a->parts;
    else
      b = a;
    while (b)
    {
      snprintf (buf, sizeof (buf), "%s/%s", TYPE (b), b->subtype);
      if (mutt_is_autoview (b, buf))
      {
	rfc1524_entry *entry = rfc1524_new_entry ();

	if (rfc1524_mailcap_lookup (b, buf, entry, M_AUTOVIEW))
	{
	  choice = b;
	}
	rfc1524_free_entry (&entry);
      }
      b = b->next;
    }
  }

  /* Then, look for a text entry */
  if (!choice)
  {
    if (a && a->parts) 
      b = a->parts;
    else
      b = a;
    while (b)
    {
      if (b->type == TYPETEXT)
      {
	if (! mutt_strcasecmp ("plain", b->subtype) && type <= TXTPLAIN)
	{
	  choice = b;
	  type = TXTPLAIN;
	}
	else if (! mutt_strcasecmp ("enriched", b->subtype) && type <= TXTENRICHED)
	{
	  choice = b;
	  type = TXTENRICHED;
	}
	else if (! mutt_strcasecmp ("html", b->subtype) && type <= TXTHTML)
	{
	  choice = b;
	  type = TXTHTML;
	}
      }
      b = b->next;
    }
  }

  /* Finally, look for other possibilities */
  if (!choice)
  {
    if (a && a->parts) 
      b = a->parts;
    else
      b = a;
    while (b)
    {
      if (mutt_can_decode (b))
	choice = b;
      b = b->next;
    }
  }

  if (choice)
  {
    if (s->flags & M_DISPLAY && !option (OPTWEED))
    {
      fseek (s->fpin, choice->hdr_offset, 0);
      mutt_copy_bytes(s->fpin, s->fpout, choice->offset-choice->hdr_offset);
    }
    mutt_body_handler (choice, s);
  }
  else if (s->flags & M_DISPLAY)
  {
    /* didn't find anything that we could display! */
    state_puts(_("[-- Error:  Could not display any parts of Multipart/Alternative! --]\n"), s);
  }
}

/* handles message/rfc822 body parts */
void message_handler (BODY *a, STATE *s)
{
  struct stat st;
  BODY *b;
  long off_start;

  off_start = ftell (s->fpin);
  if (a->encoding == ENCBASE64 || a->encoding == ENCQUOTEDPRINTABLE || 
      a->encoding == ENCUUENCODED)
  {
    fstat (fileno (s->fpin), &st);
    b = mutt_new_body ();
    b->length = (long) st.st_size;
    b->parts = mutt_parse_messageRFC822 (s->fpin, b);
  }
  else
    b = a;

  if (b->parts)
  {
    mutt_copy_hdr (s->fpin, s->fpout, off_start, b->parts->offset,
	(((s->flags & M_WEED) || ((s->flags & M_DISPLAY) && option (OPTWEED))) ? (CH_WEED | CH_REORDER) : 0) |
	(s->prefix ? CH_PREFIX : 0) | CH_DECODE | CH_FROM, s->prefix);

    if (s->prefix)
      state_puts (s->prefix, s);
    state_putc ('\n', s);

    mutt_body_handler (b->parts, s);
  }

  if (a->encoding == ENCBASE64 || a->encoding == ENCQUOTEDPRINTABLE ||
      a->encoding == ENCUUENCODED)
    mutt_free_body (&b);
}

/* returns 1 if decoding the attachment will produce output */
int mutt_can_decode (BODY *a)
{
  char type[STRING];

  snprintf (type, sizeof (type), "%s/%s", TYPE (a), a->subtype);
  if (mutt_is_autoview (a, type))
    return (rfc1524_mailcap_lookup (a, type, NULL, M_AUTOVIEW));
  else if (a->type == TYPETEXT)
    return (1);
  else if (a->type == TYPEMESSAGE)
    return (1);
  else if (a->type == TYPEMULTIPART)
  {






    {
      BODY *p;

      for (p = a->parts; p; p = p->next)
      {
	if (mutt_can_decode (p))
	  return (1);
      }
    }
  }






  return (0);
}

void multipart_handler (BODY *a, STATE *s)
{
  BODY *b, *p;
  char length[5];
  struct stat st;
  int count;

  if (a->encoding == ENCBASE64 || a->encoding == ENCQUOTEDPRINTABLE ||
      a->encoding == ENCUUENCODED)
  {
    fstat (fileno (s->fpin), &st);
    b = mutt_new_body ();
    b->length = (long) st.st_size;
    b->parts = mutt_parse_multipart (s->fpin,
		  mutt_get_parameter ("boundary", a->parameter),
		  (long) st.st_size, mutt_strcasecmp ("digest", a->subtype) == 0);
  }
  else
    b = a;

  for (p = b->parts, count = 1; p; p = p->next, count++)
  {
    if (s->flags & M_DISPLAY)
    {
      state_printf (s, _("[-- Attachment #%d"), count);
      if (p->description || p->filename || p->form_name)
      {
	state_puts (": ", s);
	state_puts (p->description ? p->description :
		    p->filename ? p->filename : p->form_name, s);
      }
      state_puts (" --]\n", s);

      mutt_pretty_size (length, sizeof (length), p->length);
      
      state_printf (s, _("[-- Type: %s/%s, Encoding: %s, Size: %s --]\n"),
		    TYPE (p), p->subtype, ENCODING (p->encoding), length);
      if (!option (OPTWEED))
      {
	fseek (s->fpin, p->hdr_offset, 0);
	mutt_copy_bytes(s->fpin, s->fpout, p->offset-p->hdr_offset);
      }
      else
	state_putc ('\n', s);
    }
    else
    {
      if (p->description && mutt_can_decode (p))
	state_printf (s, "Content-Description: %s\n", p->description);

      if (p->form_name)
	state_printf(s, "%s: \n", p->form_name);

    }
    mutt_body_handler (p, s);
    state_putc ('\n', s);
  }

  if (a->encoding == ENCBASE64 || a->encoding == ENCQUOTEDPRINTABLE ||
      a->encoding == ENCUUENCODED)
    mutt_free_body (&b);
}

void autoview_handler (BODY *a, STATE *s)
{
  rfc1524_entry *entry = rfc1524_new_entry ();
  char buffer[LONG_STRING];
  char type[STRING];
  char command[LONG_STRING];
  char tempfile[_POSIX_PATH_MAX] = "";
  char *fname;
  FILE *fpin = NULL;
  FILE *fpout = NULL;
  FILE *fperr = NULL;
  int piped = FALSE;
  pid_t thepid;

  snprintf (type, sizeof (type), "%s/%s", TYPE (a), a->subtype);
  rfc1524_mailcap_lookup (a, type, entry, M_AUTOVIEW);

  fname = safe_strdup (a->filename);
  mutt_sanitize_filename (fname, 1);
  rfc1524_expand_filename (entry->nametemplate, fname, tempfile, sizeof (tempfile));
  FREE (&fname);

  if (entry->command)
  {
    strfcpy (command, entry->command, sizeof (command));

    /* rfc1524_expand_command returns 0 if the file is required */
    piped = rfc1524_expand_command (a, tempfile, type, command, sizeof (command));

    if (s->flags & M_DISPLAY)
    {
      state_printf (s, _("[-- Autoview using %s --]\n"), command);
      mutt_message(_("Invoking autoview command: %s"),command);
    }

    if ((fpin = safe_fopen (tempfile, "w+")) == NULL)
    {
      mutt_perror ("fopen");
      rfc1524_free_entry (&entry);
      return;
    }
    
    mutt_copy_bytes (s->fpin, fpin, a->length);

    if(!piped)
    {
      fclose (fpin);
      thepid = mutt_create_filter (command, NULL, &fpout, &fperr);
    }
    else
    {
      unlink(tempfile);
      fflush(fpin);
      rewind(fpin);
      thepid = mutt_create_filter_fd (command, NULL, &fpout, &fperr,
				      fileno(fpin), -1, -1);
    }

    if (s->prefix)
    {
      while (fgets (buffer, sizeof(buffer), fpout) != NULL)
      {
        state_puts (s->prefix, s);
        state_puts (buffer, s);
      }
      /* check for data on stderr */
      if (fgets (buffer, sizeof(buffer), fperr)) 
      {
	if (s->flags & M_DISPLAY) 
	  state_printf (s, _("[-- Autoview stderr of %s --]\n"), command);

	state_puts (s->prefix, s);
	state_puts (buffer, s);
	while (fgets (buffer, sizeof(buffer), fperr) != NULL)
	{
	  state_puts (s->prefix, s);
	  state_puts (buffer, s);
	}
      }
    }
    else
    {
      mutt_copy_stream (fpout, s->fpout);
      /* Check for stderr messages */
      if (fgets (buffer, sizeof(buffer), fperr))
      {
	if (s->flags & M_DISPLAY)
	  state_printf (s, _("[-- Autoview stderr of %s --]\n"), 
			command);
	
	state_puts (buffer, s);
	mutt_copy_stream (fperr, s->fpout);
      }
    }

    fclose (fpout);
    fclose (fperr);
    mutt_wait_filter (thepid);
    if(piped)
      fclose(fpin);
    else
      mutt_unlink (tempfile);

    if (s->flags & M_DISPLAY) 
      mutt_clear_error ();
  }
  rfc1524_free_entry (&entry);
}

static void external_body_handler (BODY *b, STATE *s)
{
  const char *access_type;
  const char *expiration;
  time_t expire;

  access_type = mutt_get_parameter ("access-type", b->parameter);
  if (!access_type)
  {
    if (s->flags & M_DISPLAY)
      state_puts (_("[-- Error: message/external-body has no access-type parameter --]\n"), s);
    return;
  }

  expiration = mutt_get_parameter ("expiration", b->parameter);
  if (expiration)
    expire = mutt_parse_date (expiration, NULL);
  else
    expire = -1;

  if (!mutt_strcasecmp (access_type, "x-mutt-deleted"))
  {
    if (s->flags & M_DISPLAY)
    {
      char *length;
      char pretty_size[10];

      state_printf (s, _("[-- This %s/%s attachment "),
	       TYPE(b->parts), b->parts->subtype);
      length = mutt_get_parameter ("length", b->parameter);
      if (length)
      {
	mutt_pretty_size (pretty_size, sizeof (pretty_size),
			  strtol (length, NULL, 10));
	state_printf (s, _("(size %s bytes) "), pretty_size);
      }
      state_puts (_("has been deleted --]\n"), s);

      if (expire != -1)
	state_printf (s, _("[-- on %s --]\n"), expiration);
      mutt_copy_hdr (s->fpin, s->fpout, ftell (s->fpin), b->parts->offset,
		     (option (OPTWEED) ? (CH_WEED | CH_REORDER) : 0) |
		     CH_DECODE , NULL);
    }
  }
  else if(expire < time(NULL))
  {
    if (s->flags & M_DISPLAY)
    {
      state_printf (s, _("[-- This %s/%s attachment is not included, --]\n"
			 "[-- and the indicated external source has --]\n"
			 "[-- expired. --]\n"),
		    TYPE(b->parts), b->parts->subtype);
      mutt_copy_hdr(s->fpin, s->fpout, ftell (s->fpin), b->parts->offset,
		    (option (OPTWEED) ? (CH_WEED | CH_REORDER) : 0) |
		    CH_DECODE, NULL);
    }
  }
  else
  {
    if (s->flags & M_DISPLAY)
    {
      state_printf (s,
	       _("[-- This %s/%s attachment is not included, --]\n"
		 "[-- and the indicated access-type %s is unsupported --]\n"),
	       TYPE(b->parts), b->parts->subtype, access_type);
      mutt_copy_hdr (s->fpin, s->fpout, ftell (s->fpin), b->parts->offset,
		     (option (OPTWEED) ? (CH_WEED | CH_REORDER) : 0) |
		     CH_DECODE , NULL);
    }
  }
}

void mutt_decode_attachment (BODY *b, STATE *s)
{
  fseek (s->fpin, b->offset, 0);
  switch (b->encoding)
  {
    case ENCQUOTEDPRINTABLE:
      mutt_decode_quoted (s, b, mutt_is_text_type (b->type, b->subtype));
      break;
    case ENCBASE64:
      mutt_decode_base64 (s, b, mutt_is_text_type (b->type, b->subtype));
      break;
    case ENCUUENCODED:
      mutt_decode_uuencoded (s, b, mutt_is_text_type (b->type, b->subtype));
      break;
    default:
      mutt_decode_xbit (s, b, mutt_is_text_type (b->type, b->subtype));
      break;
  }
}

void mutt_body_handler (BODY *b, STATE *s)
{
  int decode = 0;
  int plaintext = 0;
  FILE *fp = NULL;
  char tempfile[_POSIX_PATH_MAX];
  handler_t handler = NULL;
  long tmpoffset = 0;
  size_t tmplength = 0;
  char type[STRING];

  /* first determine which handler to use to process this part */

  snprintf (type, sizeof (type), "%s/%s", TYPE (b), b->subtype);
  if (mutt_is_autoview (b, type))
  {
    rfc1524_entry *entry = rfc1524_new_entry ();

    if (rfc1524_mailcap_lookup (b, type, entry, M_AUTOVIEW))
      handler = autoview_handler;
    rfc1524_free_entry (&entry);
  }
  else if (b->type == TYPETEXT)
  {
    if (mutt_strcasecmp ("plain", b->subtype) == 0)
    {
      /* avoid copying this part twice since removing the transfer-encoding is
       * the only operation needed.
       */
      plaintext = 1;
    }
    else if (mutt_strcasecmp ("enriched", b->subtype) == 0)
      handler = text_enriched_handler;
    else if (mutt_strcasecmp ("rfc822-headers", b->subtype) == 0)
      plaintext = 1;
  }
  else if (b->type == TYPEMESSAGE)
  {
    if(mutt_is_message_type(b->type, b->subtype))
      handler = message_handler;
    else if (!mutt_strcasecmp ("delivery-status", b->subtype))
      plaintext = 1;
    else if (!mutt_strcasecmp ("external-body", b->subtype))
      handler = external_body_handler;
  }
  else if (b->type == TYPEMULTIPART)
  {






    if (mutt_strcasecmp ("alternative", b->subtype) == 0)
      handler = alternative_handler;






    if (!handler)
      handler = multipart_handler;
  }






  if (plaintext || handler)
  {
    fseek (s->fpin, b->offset, 0);

    /* see if we need to decode this part before processing it */
    if (b->encoding == ENCBASE64 || b->encoding == ENCQUOTEDPRINTABLE ||
	b->encoding == ENCUUENCODED || plaintext)
    {
      int origType = b->type;
      char *savePrefix = NULL;

      if (!plaintext)
      {
	/* decode to a tempfile, saving the original destination */
	fp = s->fpout;
	mutt_mktemp (tempfile);
	if ((s->fpout = safe_fopen (tempfile, "w")) == NULL)
	{
	  mutt_error _("Unable to open temporary file!");
	  return;
	}
	/* decoding the attachment changes the size and offset, so save a copy
	 * of the "real" values now, and restore them after processing
	 */
	tmplength = b->length;
	tmpoffset = b->offset;

	/* if we are decoding binary bodies, we don't want to prefix each
	 * line with the prefix or else the data will get corrupted.
	 */
	savePrefix = s->prefix;
	s->prefix = NULL;

	decode = 1;
      }
      else
	b->type = TYPETEXT;

      mutt_decode_attachment (b, s);

      if (decode)
      {
	b->length = ftell (s->fpout);
	b->offset = 0;
	fclose (s->fpout);

	/* restore final destination and substitute the tempfile for input */
	s->fpout = fp;
	fp = s->fpin;
	s->fpin = fopen (tempfile, "r");
	unlink (tempfile);

	/* restore the prefix */
	s->prefix = savePrefix;
      }

      b->type = origType;
    }

    /* process the (decoded) body part */
    if (handler)
    {
      handler (b, s);

      if (decode)
      {
	b->length = tmplength;
	b->offset = tmpoffset;

	/* restore the original source stream */
	fclose (s->fpin);
	s->fpin = fp;
      }
    }
  }
  else if (s->flags & M_DISPLAY)
  {
    state_printf (s, _("[-- %s/%s is unsupported "), TYPE (b), b->subtype);
    if (!option (OPTVIEWATTACH))
    {
      if (km_expand_key (type, sizeof(type),
			km_find_func (MENU_PAGER, OP_VIEW_ATTACHMENTS)))
	fprintf (s->fpout, _("(use '%s' to view this part)"), type);
      else
	fputs (_("(need 'view-attachments' bound to key!)"), s->fpout);
    }
    fputs (" --]\n", s->fpout);
  }
}