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gmime-content-type.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Authors: Jeffrey Stedfast <fejj@helixcode.com>
 *
 *  Copyright 2000 Helix Code, Inc. (www.helixcode.com)
 *
 *  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 Street #330, Boston, MA 02111-1307, USA.
 *
 */


#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

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

#include "gmime-content-type.h"
#include "gmime-table-private.h"

#include <glib.h>

#define d(x)


static int
param_equal (gconstpointer v, gconstpointer v2)
{
      return g_strcasecmp ((const char *) v, (const char *) v2) == 0;
}

static guint
param_hash (gconstpointer key)
{
      const char *p = key;
      guint h = tolower (*p);
      
      if (h)
            for (p += 1; *p != '\0'; p++)
                  h = (h << 5) - h + tolower (*p);
      
      return h;
}

/**
 * g_mime_content_type_new:
 * @type: MIME type (or NULL for "text")
 * @subtype: MIME subtype (or NULL for "plain")
 *
 * Creates a Content-Type object with type @type and subtype @subtype.
 *
 * Returns a new MIME Content-Type object.
 **/
GMimeContentType *
g_mime_content_type_new (const char *type, const char *subtype)
{
      GMimeContentType *mime_type;
      
      mime_type = g_new0 (GMimeContentType, 1);
      
      if (type && *type && subtype && *subtype) {
            mime_type->type = g_strdup (type);
            mime_type->subtype = g_strdup (subtype);
      } else {
            if (type && *type) {
                  mime_type->type = g_strdup (type);
                  if (!g_strcasecmp (type, "text")) {
                        mime_type->subtype = g_strdup ("plain");
                  } else if (!g_strcasecmp (type, "multipart")) {
                        mime_type->subtype = g_strdup ("mixed");
                  } else {
                        g_free (mime_type->type);
                        mime_type->type = g_strdup ("application");
                        mime_type->subtype = g_strdup ("octet-stream");
                  }
            } else {
                  mime_type->type = g_strdup ("application");
                  mime_type->subtype = g_strdup ("octet-stream");
            }
            
            g_warning ("Invalid or incomplete type: %s%s%s: defaulting to %s/%s",
                     type ? type : "", subtype ? "/" : "", subtype ? subtype : "",
                     mime_type->type, mime_type->subtype);
      }
      
      return mime_type;
}


/**
 * g_mime_content_type_new_from_string:
 * @string: input string containing a content-type (and params)
 *
 * Constructs a new Content-Type object based on the input string.
 *
 * Returns a new MIME Content-Type based on the input string.
 **/
GMimeContentType *
g_mime_content_type_new_from_string (const char *string)
{
      GMimeContentType *mime_type;
      char *type = NULL, *subtype;
      register const char *inptr;
      
      g_return_val_if_fail (string != NULL, NULL);
      
      inptr = string;
      
      /* get the type */
      type = (char *) inptr;
      while (*inptr && is_ttoken (*inptr))
            inptr++;
      
      type = g_strndup (type, (unsigned) (inptr - type));
      g_strstrip (type);
      
      /* get the subtype */
      if (*inptr == '/') {
            inptr++;
            subtype = (char *) inptr;
            while (*inptr && is_ttoken (*inptr))
                  inptr++;
            
            subtype = g_strndup (subtype, (unsigned) (inptr - subtype));
            g_strstrip (subtype);
      } else {
            subtype = NULL;
      }
      
      mime_type = g_mime_content_type_new (type, subtype);
      g_free (type);
      g_free (subtype);
      
      if (*inptr++ == ';' && *inptr) {
            GMimeParam *p;
            
            mime_type->params = g_mime_param_new_from_string (inptr);
            p = mime_type->params;
            if (p != NULL) {
                  mime_type->param_hash = g_hash_table_new (param_hash, param_equal);
                  
                  while (p) {
                        g_hash_table_insert (mime_type->param_hash, p->name, p);
                        p = p->next;
                  }
            }
      }
      
      return mime_type;
}


/**
 * g_mime_content_type_destroy: Destroy a MIME Content-Type object
 * @mime_type: MIME Content-Type object to destroy
 *
 * Destroys the given MIME Content-Type object.
 **/
void
g_mime_content_type_destroy (GMimeContentType *mime_type)
{
      g_return_if_fail (mime_type != NULL);
      
      g_free (mime_type->type);
      g_free (mime_type->subtype);
      
      if (mime_type->param_hash)
            g_hash_table_destroy (mime_type->param_hash);
      
      g_mime_param_destroy (mime_type->params);
      
      g_free (mime_type);
}


/**
 * g_mime_content_type_to_string:
 * @mime_type: MIME Content-Type
 *
 * Allocates a string buffer containing the type and subtype defined
 * by the @mime_type.
 *
 * Returns an allocated string containing the type and subtype of the
 * content-type in the format: type/subtype.
 **/
char *
g_mime_content_type_to_string (const GMimeContentType *mime_type)
{
      char *string;
      
      g_return_val_if_fail (mime_type != NULL, NULL);
      
      /* type and subtype should never be NULL, but check anyway */
      string = g_strdup_printf ("%s/%s", mime_type->type ? mime_type->type : "text",
                          mime_type->subtype ? mime_type->subtype : "plain");
      
      return string;
}


/**
 * g_mime_content_type_is_type:
 * @mime_type: MIME Content-Type
 * @type: MIME type to compare against
 * @subtype: MIME subtype to compare against
 *
 * Compares the given type and subtype with that of the given mime
 * type object.
 *
 * Returns TRUE if the MIME types match or FALSE otherwise. You may
 * use "*" in place of @type and/or @subtype as a wilcard.
 **/
gboolean
g_mime_content_type_is_type (const GMimeContentType *mime_type, const char *type, const char *subtype)
{
      g_return_val_if_fail (mime_type != NULL, FALSE);
      g_return_val_if_fail (mime_type->type != NULL, FALSE);
      g_return_val_if_fail (mime_type->subtype != NULL, FALSE);
      g_return_val_if_fail (type != NULL, FALSE);
      g_return_val_if_fail (subtype != NULL, FALSE);
      
      if (!g_strcasecmp (mime_type->type, type)) {
            if (!strcmp (subtype, "*")) {
                  /* special case */
                  return TRUE;
            } else {
                  if (!g_strcasecmp (mime_type->subtype, subtype))
                        return TRUE;
                  else
                        return FALSE;
            }
      }
      
      return FALSE;
}


/**
 * g_mime_content_type_set_parameter:
 * @mime_type: MIME Content-Type
 * @attribute: parameter name (aka attribute)
 * @value: parameter value
 *
 * Sets a parameter on the Content-Type.
 **/
void
g_mime_content_type_set_parameter (GMimeContentType *mime_type, const char *attribute, const char *value)
{
      GMimeParam *param = NULL;
      
      g_return_if_fail (mime_type != NULL);
      g_return_if_fail (attribute != NULL);
      g_return_if_fail (value != NULL);
      
      if (mime_type->params) {
            param = g_hash_table_lookup (mime_type->param_hash, attribute);
            if (param) {
                  g_free (param->value);
                  param->value = g_strdup (value);
            }
      } else {
            /* hash table may not be initialized */
            if (!mime_type->param_hash)
                  mime_type->param_hash = g_hash_table_new (param_hash, param_equal);
      }
      
      if (param == NULL) {
            param = g_mime_param_new (attribute, value);
            mime_type->params = g_mime_param_append_param (mime_type->params, param);
            g_hash_table_insert (mime_type->param_hash, param->name, param);
      }
}


/**
 * g_mime_content_type_get_parameter:
 * @mime_type: MIME Content-Type
 * @attribute: parameter name (aka attribute)
 *
 * Gets the parameter value specified by @attribute if it's available.
 *
 * Returns a const pointer to the paramer value specified by
 * @attribute or %NULL on fail.
 **/
const char *
g_mime_content_type_get_parameter (const GMimeContentType *mime_type, const char *attribute)
{
      GMimeParam *param;
      
      g_return_val_if_fail (mime_type != NULL, NULL);
      g_return_val_if_fail (attribute != NULL, NULL);
      
      if (!mime_type->param_hash)
            return NULL;
      
      param = g_hash_table_lookup (mime_type->param_hash, attribute);
      
      if (param)
            return param->value;
      else
            return NULL;
}

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