subversion/libsvn_subr/validate.c

   1 /*
   2  * validate.c:  validation routines
   3  *
   4  * ====================================================================
   5  * Copyright (c) 2000-2004 CollabNet.  All rights reserved.
   6  *
   7  * This software is licensed as described in the file COPYING, which
   8  * you should have received as part of this distribution.  The terms
   9  * are also available at http://subversion.tigris.org/license-1.html.
  10  * If newer versions of this license are posted there, you may use a
  11  * newer version instead, at your option.
  12  *
  13  * This software consists of voluntary contributions made by many
  14  * individuals.  For exact contribution history, see the revision
  15  * history and logs, available at http://subversion.tigris.org/.
  16  * ====================================================================
  17  */
  18
  19 /* ==================================================================== */
  20
  21
  22 \f
  23 /*** Includes. ***/
  24
  25 #include <apr_lib.h>
  26 #define APR_WANT_STRFUNC
  27 #include <apr_want.h>
  28
  29 #include "svn_error.h"
  30 #include "svn_private_config.h"
  31
  32
  33 \f
  34 /*** Code. ***/
  35
  36 svn_error_t *
  37 svn_mime_type_validate(const char *mime_type, apr_pool_t *pool)
  38 {
  39   /* Since svn:mime-type can actually contain a full content type
  40      specification, e.g., "text/html; charset=UTF-8", make sure we're
  41      only looking at the media type here. */
  42   const apr_size_t len = strcspn(mime_type, "; ");
  43   const char *const slash_pos = strchr(mime_type, '/');
  44   int i;
  45   const char *tspecials = "()<>@,;:\\\"/[]?=";
  46
  47   if (len == 0)
  48     return svn_error_createf
  49       (SVN_ERR_BAD_MIME_TYPE, NULL,
  50        _("MIME type '%s' has empty media type"), mime_type);
  51
  52   if (slash_pos == NULL || slash_pos >= &mime_type[len])
  53     return svn_error_createf
  54       (SVN_ERR_BAD_MIME_TYPE, NULL,
  55        _("MIME type '%s' does not contain '/'"), mime_type);
  56
  57   /* Check the mime type for illegal characters. See RFC 1521. */
  58   for (i = 0; i < len; i++)
  59     {
  60       if (&mime_type[i] != slash_pos
  61         && (! apr_isascii(mime_type[i])
  62             || apr_iscntrl(mime_type[i])
  63             || apr_isspace(mime_type[i])
  64             || (strchr(tspecials, mime_type[i]) != NULL)))
  65         return svn_error_createf
  66           (SVN_ERR_BAD_MIME_TYPE, NULL,
  67            _("MIME type '%s' contains invalid character '%c'"),
  68            mime_type, mime_type[i]);
  69     }
  70
  71   return SVN_NO_ERROR;
  72 }
  73
  74
  75 svn_boolean_t
  76 svn_mime_type_is_binary(const char *mime_type)
  77 {
  78   /* See comment in svn_mime_type_validate() above. */
  79   const apr_size_t len = strcspn(mime_type, "; ");
  80   return ((strncmp(mime_type, "text/", 5) != 0)
  81           && (len != 15 || strncmp(mime_type, "image/x-xbitmap", len) != 0)
  82           && (len != 15 || strncmp(mime_type, "image/x-xpixmap", len) != 0)
  83           );
  84 }