Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
tree: 4a066faf3b
Fetching contributors…

Cannot retrieve contributors at this time

file 382 lines (315 sloc) 8.556 kb
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 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 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382
/*
* Copyright (C) 1999-2001 Thomas Roessler <roessler@does-not-exist.org>
*
* 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., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/

/*
* Yet another MIME encoding for header data. This time, it's
* parameters, specified in RFC 2231, and modeled after the
* encoding used in URLs.
*
* Additionally, continuations and encoding are mixed in an, errrm,
* interesting manner.
*
*/

#if HAVE_CONFIG_H
# include "config.h"
#endif

#include "mutt.h"
#include "mime.h"
#include "charset.h"
#include "rfc2047.h"
#include "rfc2231.h"

#include <ctype.h>
#include <string.h>
#include <stdlib.h>

struct rfc2231_parameter
{
  char *attribute;
  char *value;
  int index;
  int encoded;
  struct rfc2231_parameter
       *next;
};

static char *rfc2231_get_charset (char *, char *, size_t);
static struct rfc2231_parameter *rfc2231_new_parameter (void);
static void rfc2231_decode_one (char *, char *);
static void rfc2231_free_parameter (struct rfc2231_parameter **);
static void rfc2231_join_continuations (PARAMETER **, struct rfc2231_parameter *);
static void rfc2231_list_insert (struct rfc2231_parameter **, struct rfc2231_parameter *);

static void purge_empty_parameters (PARAMETER **headp)
{
  PARAMETER *p, *q, **last;
  
  for (last = headp, p = *headp; p; p = q)
  {
    q = p->next;
    if (!p->attribute || !p->value)
    {
      *last = q;
      p->next = NULL;
      mutt_free_parameter (&p);
    }
    else
      last = &p->next;
  }
}


void rfc2231_decode_parameters (PARAMETER **headp)
{
  PARAMETER *head = NULL;
  PARAMETER **last;
  PARAMETER *p, *q;

  struct rfc2231_parameter *conthead = NULL;
  struct rfc2231_parameter *conttmp;

  char *s, *t;
  char charset[STRING];

  int encoded;
  int index;
  short dirty = 0; /* set to 1 when we may have created
* empty parameters.
*/
  
  if (!headp) return;

  purge_empty_parameters (headp);
  
  for (last = &head, p = *headp; p; p = q)
  {
    q = p->next;

    if (!(s = strchr (p->attribute, '*')))
    {

      /*
* Using RFC 2047 encoding in MIME parameters is explicitly
* forbidden by that document. Nevertheless, it's being
* generated by some software, including certain Lotus Notes to
* Internet Gateways. So we actually decode it.
*/

      if (option (OPTRFC2047PARAMS) && p->value && strstr (p->value, "=?"))
rfc2047_decode (&p->value);
      else if (AssumedCharset && *AssumedCharset)
        convert_nonmime_string (&p->value);

      *last = p;
      last = &p->next;
      p->next = NULL;
    }
    else if (*(s + 1) == '\0')
    {
      *s = '\0';
      
      s = rfc2231_get_charset (p->value, charset, sizeof (charset));
      rfc2231_decode_one (p->value, s);
      mutt_convert_string (&p->value, charset, Charset, M_ICONV_HOOK_FROM);
      mutt_filter_unprintable (&p->value);

      *last = p;
      last = &p->next;
      p->next = NULL;
      
      dirty = 1;
    }
    else
    {
      *s = '\0'; s++; /* let s point to the first character of index. */
      for (t = s; *t && isdigit ((unsigned char) *t); t++)
;
      encoded = (*t == '*');
      *t = '\0';

      index = atoi (s);

      conttmp = rfc2231_new_parameter ();
      conttmp->attribute = p->attribute;
      conttmp->value = p->value;
      conttmp->encoded = encoded;
      conttmp->index = index;
      
      p->attribute = NULL;
      p->value = NULL;
      FREE (&p);

      rfc2231_list_insert (&conthead, conttmp);
    }
  }

  if (conthead)
  {
    rfc2231_join_continuations (last, conthead);
    dirty = 1;
  }
  
  *headp = head;
  
  if (dirty)
    purge_empty_parameters (headp);
}
  
static struct rfc2231_parameter *rfc2231_new_parameter (void)
{
  return safe_calloc (sizeof (struct rfc2231_parameter), 1);
}

static void rfc2231_free_parameter (struct rfc2231_parameter **p)
{
  if (*p)
  {
    FREE (&(*p)->attribute);
    FREE (&(*p)->value);
    FREE (p); /* __FREE_CHECKED__ */
  }
}

static char *rfc2231_get_charset (char *value, char *charset, size_t chslen)
{
  char *t, *u;
  
  if (!(t = strchr (value, '\'')))
  {
    charset[0] = '\0';
    return value;
  }
  
  *t = '\0';
  strfcpy (charset, value, chslen);
  
  if ((u = strchr (t + 1, '\'')))
    return u + 1;
  else
    return t + 1;
}

static void rfc2231_decode_one (char *dest, char *src)
{
  char *d;

  for (d = dest; *src; src++)
  {
    if (*src == '%' &&
        isxdigit ((unsigned char) *(src + 1)) &&
        isxdigit ((unsigned char) *(src + 2)))
    {
      *d++ = (hexval (*(src + 1)) << 4) | (hexval (*(src + 2)));
      src += 2;
    }
    else
      *d++ = *src;
  }
  
  *d = '\0';
}

/* insert parameter into an ordered list.
*
* Primary sorting key: attribute
* Secondary sorting key: index
*/

static void rfc2231_list_insert (struct rfc2231_parameter **list,
struct rfc2231_parameter *par)
{
  struct rfc2231_parameter **last = list;
  struct rfc2231_parameter *p = *list, *q;
  int c;
  
  while (p)
  {
    last = &p->next;
    q = p; p = p->next;

    c = strcmp (par->value, q->value);
    if ((c > 0) || (c == 0 && par->index >= q->index))
      break;
  }
  
  par->next = p;
  *last = par;
}

/* process continuation parameters */

static void rfc2231_join_continuations (PARAMETER **head,
struct rfc2231_parameter *par)
{
  struct rfc2231_parameter *q;

  char attribute[STRING];
  char charset[STRING];
  char *value = NULL;
  char *valp;
  int encoded;

  size_t l, vl;
  
  while (par)
  {
    value = NULL; l = 0;
    
    strfcpy (attribute, par->attribute, sizeof (attribute));

    if ((encoded = par->encoded))
      valp = rfc2231_get_charset (par->value, charset, sizeof (charset));
    else
      valp = par->value;

    do
    {
      if (encoded && par->encoded)
rfc2231_decode_one (par->value, valp);
      
      vl = strlen (par->value);
      
      safe_realloc (&value, l + vl + 1);
      strcpy (value + l, par->value); /* __STRCPY_CHECKED__ */
      l += vl;

      q = par->next;
      rfc2231_free_parameter (&par);
      if ((par = q))
valp = par->value;
    } while (par && !strcmp (par->attribute, attribute));
    
    if (value)
    {
      if (encoded)
mutt_convert_string (&value, charset, Charset, M_ICONV_HOOK_FROM);
      *head = mutt_new_parameter ();
      (*head)->attribute = safe_strdup (attribute);
      (*head)->value = value;
      head = &(*head)->next;
    }
  }
}

int rfc2231_encode_string (char **pd)
{
  int ext = 0, encode = 0;
  char *charset, *s, *t, *e, *d = 0;
  size_t slen, dlen = 0;

  /*
* A shortcut to detect pure 7bit data.
*
* This should prevent the worst when character set handling
* is flawed.
*/

  for (s = *pd; *s; s++)
    if (*s & 0x80)
      break;
  
  if (!*s)
    return 0;
  
  if (!Charset || !SendCharset ||
      !(charset = mutt_choose_charset (Charset, SendCharset,
*pd, strlen (*pd), &d, &dlen)))
  {
    charset = safe_strdup (Charset ? Charset : "unknown-8bit");
    d = *pd;
    dlen = strlen (d);
  }

  if (!mutt_is_us_ascii (charset))
    encode = 1;

  for (s = d, slen = dlen; slen; s++, slen--)
    if (*s < 0x20 || *s >= 0x7f)
      encode = 1, ++ext;
    else if (strchr (MimeSpecials, *s) || strchr ("*'%", *s))
      ++ext;

  if (encode)
  {
    e = safe_malloc (dlen + 2*ext + strlen (charset) + 3);
    sprintf (e, "%s''", charset); /* __SPRINTF_CHECKED__ */
    t = e + strlen (e);
    for (s = d, slen = dlen; slen; s++, slen--)
      if (*s < 0x20 || *s >= 0x7f ||
strchr (MimeSpecials, *s) || strchr ("*'%", *s))
      {
sprintf (t, "%%%02X", (unsigned char)*s);
t += 3;
      }
      else
*t++ = *s;
    *t = '\0';

    if (d != *pd)
      FREE (&d);
    FREE (pd); /* __FREE_CHECKED__ */
    *pd = e;
  }
  else if (d != *pd)
  {
    FREE (pd); /* __FREE_CHECKED__ */
    *pd = d;
  }
  
  FREE (&charset);
  
  return encode;
}
Something went wrong with that request. Please try again.