Remove useless comparison

[pidgin-git.git] / libpurple / protocols / oscar / family_feedbag.c

/*
 * Purple's oscar protocol plugin
 * This file is the legal property of its developers.
 * Please see the AUTHORS file distributed alongside this file.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
*/

/*
 * Family 0x0013 - Server-Side/Stored Information.
 *
 * Relatively new facility that allows certain types of information, such as
 * a user's buddy list, permit/deny list, and permit/deny preferences, to be
 * stored on the server, so that they can be accessed from any client.
 *
 * We keep 2 copies of SSI data:
 * 1) An exact copy of what is stored on the AIM servers.
 * 2) A local copy that we make changes to, and then send diffs
 *    between this and the exact copy to keep them in sync.
 *
 * All the "aim_ssi_itemlist_bleh" functions near the top just modify the list
 * that is given to them (i.e. they don't send SNACs).
 *
 * The SNAC sending and receiving functions are lower down in the file, and
 * they're simpler.  They are in the order of the subtypes they deal with,
 * starting with the request rights function (subtype 0x0002), then parse
 * rights (subtype 0x0003), then--well, you get the idea.
 *
 * This is entirely too complicated.
 * You don't know the half of it.
 *
 */

#include "oscar.h"
#include "debug.h"

static int aim_ssi_addmoddel(OscarData *od);

/**
 * List types based on http://dev.aol.com/aim/oscar/#FEEDBAG (archive.org)
 * and http://iserverd.khstu.ru/oscar/ssi_item.html
 *
 * @param type The type of a list item as integer number, as provided by an aim_ssi_item struct.
 * @return Returns the name of the item type as a character string.
 */
static const gchar*
aim_ssi_type_to_string(guint16 type)
{
        struct TypeStringPair
        {
                guint16 type;
                const gchar *string;
        };
        static const struct TypeStringPair type_strings[] = {
                { 0x0000, "Buddy" },
                { 0x0001, "Group" },
                { 0x0002, "Permit/Visible" },
                { 0x0003, "Deny/Invisible" },
                { 0x0004, "PDInfo" },
                { 0x0005, "PresencePrefs" }, 
                { 0x0006, "Non-Buddy Info" },
                { 0x0009, "ClientPrefs" },
                { 0x000e, "ICQDeny/Ignore" },
                { 0x0014, "Buddy Icon" }, 
                { 0x0015, "Recent Buddies" },
                { 0x0019, "Non-Buddy" },
                { 0x001d, "Vanity Info" },
                { 0x0020, "ICQ-MDir" },
                { 0x0029, "Facebook" },
        };
        size_t i;
        for (i = 0; i < G_N_ELEMENTS(type_strings); i++) {
                if (type_strings[i].type == type) {
                        return type_strings[i].string;
                }
        }
        return "unknown";
}

/** For debug log output: Appends a line containing information about a given list item to a string.
 *
 * @param str String to which the line will be appended.
 * @param prefix A string which will be prepended to the line.
 * @param item List item from which information is extracted.
 */
static void
aim_ssi_item_debug_append(GString *str, char *prefix, struct aim_ssi_item *item)
{
        g_string_append_printf(str, 
                "%s gid=0x%04hx, bid=0x%04hx, list_type=0x%04hx [%s], name=%s.\n",
                prefix, item->gid, item->bid, item->type, aim_ssi_type_to_string(item->type),
                item->name ? item->name : "(null)");
}

/**
 * Locally rebuild the 0x00c8 TLV in the additional data of the given group.
 *
 * @param list A pointer to a pointer to the current list of items.
 * @param name A null terminated string containing the group name, or NULL
 *        if you want to modify the master group.
 * @return Return a pointer to the modified item.
 */
static void
aim_ssi_itemlist_rebuildgroup(struct aim_ssi_item *list, const char *name)
{
        int newlen;
        struct aim_ssi_item *cur, *group;

        /* Find the group */
        if (!(group = aim_ssi_itemlist_finditem(list, name, NULL, AIM_SSI_TYPE_GROUP)))
                return;

        /* Find the length for the new additional data */
        newlen = 0;
        if (group->gid == 0x0000) {
                for (cur=list; cur; cur=cur->next)
                        if ((cur->type == AIM_SSI_TYPE_GROUP) && (cur->gid != 0x0000))
                                newlen += 2;
        } else {
                for (cur=list; cur; cur=cur->next)
                        if ((cur->gid == group->gid) && (cur->type == AIM_SSI_TYPE_BUDDY))
                                newlen += 2;
        }

        /* Build the new TLV list */
        if (newlen > 0) {
                guint8 *newdata;

                newdata = (guint8 *)g_malloc((newlen)*sizeof(guint8));
                newlen = 0;
                if (group->gid == 0x0000) {
                        for (cur=list; cur; cur=cur->next)
                                if ((cur->type == AIM_SSI_TYPE_GROUP) && (cur->gid != 0x0000))
                                                newlen += aimutil_put16(newdata+newlen, cur->gid);
                } else {
                        for (cur=list; cur; cur=cur->next)
                                if ((cur->gid == group->gid) && (cur->type == AIM_SSI_TYPE_BUDDY))
                                                newlen += aimutil_put16(newdata+newlen, cur->bid);
                }
                aim_tlvlist_replace_raw(&group->data, 0x00c8, newlen, newdata);

                g_free(newdata);
        }
}

/**
 * Locally add a new item to the given item list.
 *
 * @param list A pointer to a pointer to the current list of items.
 * @param name A null terminated string of the name of the new item, or NULL if the
 *        item should have no name.
 * @param gid The group ID# you want the new item to have, or 0xFFFF if we should pick something.
 * @param bid The buddy ID# you want the new item to have, or 0xFFFF if we should pick something.
 * @param type The type of the item, 0x0000 for a contact, 0x0001 for a group, etc.
 * @param data The additional data for the new item.
 * @return A pointer to the newly created item.
 */
static struct aim_ssi_item *aim_ssi_itemlist_add(struct aim_ssi_item **list, const char *name, guint16 gid, guint16 bid, guint16 type, GSList *data)
{
        gboolean exists;
        struct aim_ssi_item *cur, *new;

        new = g_new(struct aim_ssi_item, 1);

        /* Set the name */
        new->name = g_strdup(name);

        /* Set the group ID# and buddy ID# */
        new->gid = gid;
        new->bid = bid;
        if (type == AIM_SSI_TYPE_GROUP) {
                if ((new->gid == 0xFFFF) && name) {
                        do {
                                new->gid += 0x0001;
                                exists = FALSE;
                                for (cur = *list; cur != NULL; cur = cur->next)
                                        if ((cur->type == AIM_SSI_TYPE_GROUP) && (cur->gid == new->gid)) {
                                                exists = TRUE;
                                                break;
                                        }
                        } while (exists);
                }
        } else if (new->gid == 0x0000) {
                /*
                 * This is weird, but apparently items in the root group can't
                 * have a buddy ID equal to any group ID.  You'll get error
                 * 0x0003 when trying to add, which is "item already exists"
                 */
                if (new->bid == 0xFFFF) {
                        do {
                                new->bid += 0x0001;
                                exists = FALSE;
                                for (cur = *list; cur != NULL; cur = cur->next)
                                        if (cur->bid == new->bid || cur->gid == new->bid) {
                                                exists = TRUE;
                                                break;
                                        }
                        } while (exists);
                }
        } else {
                if (new->bid == 0xFFFF) {
                        do {
                                new->bid += 0x0001;
                                exists = FALSE;
                                for (cur = *list; cur != NULL; cur = cur->next)
                                        if (cur->bid == new->bid && cur->gid == new->gid) {
                                                exists = TRUE;
                                                break;
                                        }
                        } while (exists);
                }
        }

        /* Set the type */
        new->type = type;

        /* Set the TLV list */
        new->data = aim_tlvlist_copy(data);

        /* Add the item to the list in the correct numerical position.  Fancy, eh? */
        if (*list) {
                if ((new->gid < (*list)->gid) || ((new->gid == (*list)->gid) && (new->bid < (*list)->bid))) {
                        new->next = *list;
                        *list = new;
                } else {
                        struct aim_ssi_item *prev;
                        for ((prev=*list, cur=(*list)->next); (cur && ((new->gid > cur->gid) || ((new->gid == cur->gid) && (new->bid > cur->bid)))); prev=cur, cur=cur->next);
                        new->next = prev->next;
                        prev->next = new;
                }
        } else {
                new->next = *list;
                *list = new;
        }

        return new;
}

/**
 * Locally delete an item from the given item list.
 *
 * @param list A pointer to a pointer to the current list of items.
 * @param del A pointer to the item you want to remove from the list.
 * @return Return 0 if no errors, otherwise return the error number.
 */
static int aim_ssi_itemlist_del(struct aim_ssi_item **list, struct aim_ssi_item *del)
{
        if (!(*list) || !del)
                return -EINVAL;

        /* Remove the item from the list */
        if (*list == del) {
                *list = (*list)->next;
        } else {
                struct aim_ssi_item *cur;
                for (cur=*list; (cur->next && (cur->next!=del)); cur=cur->next);
                if (cur->next)
                        cur->next = del->next;
        }

        /* Free the removed item */
        g_free(del->name);
        aim_tlvlist_free(del->data);
        g_free(del);

        return 0;
}

/**
 * Compare two items to see if they have the same data.
 *
 * @param cur1 A pointer to a pointer to the first item.
 * @param cur2 A pointer to a pointer to the second item.
 * @return Return 0 if no differences, or a number if there are differences.
 */
static int aim_ssi_itemlist_cmp(struct aim_ssi_item *cur1, struct aim_ssi_item *cur2)
{
        if (!cur1 || !cur2)
                return 1;

        if (cur1->data && !cur2->data)
                return 2;

        if (!cur1->data && cur2->data)
                return 3;

        if ((cur1->data && cur2->data) && (aim_tlvlist_cmp(cur1->data, cur2->data)))
                return 4;

        if (cur1->name && !cur2->name)
                return 5;

        if (!cur1->name && cur2->name)
                return 6;

        if (cur1->name && cur2->name && oscar_util_name_compare(cur1->name, cur2->name))
                return 7;

        if (cur1->gid != cur2->gid)
                return 8;

        if (cur1->bid != cur2->bid)
                return 9;

        if (cur1->type != cur2->type)
                return 10;

        return 0;
}

static gboolean aim_ssi_itemlist_valid(struct aim_ssi_item *list, struct aim_ssi_item *item)
{
        struct aim_ssi_item *cur;
        for (cur=list; cur; cur=cur->next)
                if (cur == item)
                        return TRUE;
        return FALSE;
}

/**
 * Locally find an item given a group ID# and a buddy ID#.
 *
 * @param list A pointer to the current list of items.
 * @param gid The group ID# of the desired item.
 * @param bid The buddy ID# of the desired item.
 * @return Return a pointer to the item if found, else return NULL;
 */
struct aim_ssi_item *aim_ssi_itemlist_find(struct aim_ssi_item *list, guint16 gid, guint16 bid)
{
        struct aim_ssi_item *cur;
        for (cur=list; cur; cur=cur->next)
                if ((cur->gid == gid) && (cur->bid == bid))
                        return cur;
        return NULL;
}

/**
 * Locally find an item given a group name, buddy name, and type.  If group name
 * and buddy name are null, then just return the first item of the given type.
 *
 * @param list A pointer to the current list of items.
 * @param gn The group name of the desired item.
 * @param bn The buddy name of the desired item.
 * @param type The type of the desired item.
 * @return Return a pointer to the item if found, else return NULL.
 */
struct aim_ssi_item *aim_ssi_itemlist_finditem(struct aim_ssi_item *list, const char *gn, const char *bn, guint16 type)
{
        struct aim_ssi_item *cur;
        if (!list)
                return NULL;

        if (gn && bn) { /* For finding buddies in groups */
                for (cur=list; cur; cur=cur->next)
                        if ((cur->type == type) && (cur->name) && !(oscar_util_name_compare(cur->name, bn))) {
                                struct aim_ssi_item *curg;
                                for (curg=list; curg; curg=curg->next)
                                        if ((curg->type == AIM_SSI_TYPE_GROUP) && (curg->gid == cur->gid) && (curg->name) && !(oscar_util_name_compare(curg->name, gn)))
                                                return cur;
                        }

        } else if (gn) { /* For finding groups */
                for (cur=list; cur; cur=cur->next) {
                        if ((cur->type == type) && (cur->bid == 0x0000) && (cur->name) && !(oscar_util_name_compare(cur->name, gn))) {
                                return cur;
                        }
                }

        } else if (bn) { /* For finding permits, denies, and ignores */
                for (cur=list; cur; cur=cur->next) {
                        if ((cur->type == type) && (cur->name) && !(oscar_util_name_compare(cur->name, bn))) {
                                return cur;
                        }
                }

        /* For stuff without names--permit deny setting, visibility mask, etc. */
        } else for (cur=list; cur; cur=cur->next) {
                if ((cur->type == type) && (!cur->name))
                        return cur;
        }

        return NULL;
}

/**
 * Check if the given buddy exists in any group in the buddy list.
 *
 * @param list A pointer to the current list of items.
 * @param bn The group name of the desired item.
 * @return Return a pointer to the name of the item if found, else return NULL;
 */
struct aim_ssi_item *aim_ssi_itemlist_exists(struct aim_ssi_item *list, const char *bn)
{
        if (!bn)
                return NULL;
        return aim_ssi_itemlist_finditem(list, NULL, bn, AIM_SSI_TYPE_BUDDY);
}

/**
 * Locally find the parent item of the given buddy name.
 *
 * @param list A pointer to the current list of items.
 * @param bn The buddy name of the desired item.
 * @return Return a pointer to the name of the item if found, else return NULL;
 */
char *aim_ssi_itemlist_findparentname(struct aim_ssi_item *list, const char *bn)
{
        struct aim_ssi_item *cur, *curg;
        if (!list || !bn)
                return NULL;
        if (!(cur = aim_ssi_itemlist_exists(list, bn)))
                return NULL;
        if (!(curg = aim_ssi_itemlist_find(list, cur->gid, 0x0000)))
                return NULL;
        return curg->name;
}

/**
 * Locally find the permit/deny setting item, and return the setting.
 *
 * @param list A pointer to the current list of items.
 * @return Return the current SSI permit deny setting, or 0 if no setting was found.
 */
int aim_ssi_getpermdeny(struct aim_ssi_item *list)
{
        struct aim_ssi_item *cur = aim_ssi_itemlist_finditem(list, NULL, NULL, AIM_SSI_TYPE_PDINFO);
        if (cur) {
                aim_tlv_t *tlv = aim_tlv_gettlv(cur->data, 0x00ca, 1);
                if (tlv && tlv->value)
                        return aimutil_get8(tlv->value);
        }
        return 0;
}

/**
 * Locally find the presence flag item, and return the setting.  The returned setting is a
 * bitmask of the preferences.  See the AIM_SSI_PRESENCE_FLAG_* #defines in oscar.h.
 *
 * @param list A pointer to the current list of items.
 * @return Return the current set of preferences.
 */
guint32 aim_ssi_getpresence(struct aim_ssi_item *list)
{
        struct aim_ssi_item *cur = aim_ssi_itemlist_finditem(list, NULL, NULL, AIM_SSI_TYPE_PRESENCEPREFS);
        if (cur) {
                aim_tlv_t *tlv = aim_tlv_gettlv(cur->data, 0x00c9, 1);
                if (tlv && tlv->length)
                        return aimutil_get32(tlv->value);
        }
        return 0xFFFFFFFF;
}

/**
 * Locally find the alias of the given buddy.
 *
 * @param list A pointer to the current list of items.
 * @param gn The group of the buddy.
 * @param bn The name of the buddy.
 * @return A pointer to a NULL terminated string that is the buddy's
 *         alias, or NULL if the buddy has no alias.  You should free
 *         this returned value!
 */
char *aim_ssi_getalias(struct aim_ssi_item *list, const char *gn, const char *bn)
{
        struct aim_ssi_item *cur = aim_ssi_itemlist_finditem(list, gn, bn, AIM_SSI_TYPE_BUDDY);
        if (cur) {
                aim_tlv_t *tlv = aim_tlv_gettlv(cur->data, 0x0131, 1);
                if (tlv && tlv->length)
                        return g_strndup((const gchar *)tlv->value, tlv->length);
        }
        return NULL;
}

/**
 * Locally find the comment of the given buddy.
 *
 * @param list A pointer to the current list of items.
 * @param gn The group of the buddy.
 * @param bn The name of the buddy.
 * @return A pointer to a NULL terminated string that is the buddy's
 *         comment, or NULL if the buddy has no comment.  You should free
 *         this returned value!
 */
char *aim_ssi_getcomment(struct aim_ssi_item *list, const char *gn, const char *bn)
{
        struct aim_ssi_item *cur = aim_ssi_itemlist_finditem(list, gn, bn, AIM_SSI_TYPE_BUDDY);
        if (cur) {
                aim_tlv_t *tlv = aim_tlv_gettlv(cur->data, 0x013c, 1);
                if (tlv && tlv->length) {
                        return g_strndup((const gchar *)tlv->value, tlv->length);
                }
        }
        return NULL;
}

/**
 * Locally find if you are waiting for authorization for a buddy.
 *
 * @param list A pointer to the current list of items.
 * @param gn The group of the buddy.
 * @param bn The name of the buddy.
 * @return 1 if you are waiting for authorization; 0 if you are not
 */
gboolean aim_ssi_waitingforauth(struct aim_ssi_item *list, const char *gn, const char *bn)
{
        struct aim_ssi_item *cur = aim_ssi_itemlist_finditem(list, gn, bn, AIM_SSI_TYPE_BUDDY);
        if (cur) {
                if (aim_tlv_gettlv(cur->data, 0x0066, 1))
                        return TRUE;
        }
        return FALSE;
}

/**
 * If there are changes, then create temporary items and
 * call addmoddel.
 *
 * @param od The oscar session.
 * @return Return 0 if no errors, otherwise return the error number.
 */
static int aim_ssi_sync(OscarData *od)
{
        struct aim_ssi_item *cur1, *cur2;
        struct aim_ssi_tmp *cur, *new;
        int n = 0;
        GString *debugstr = g_string_new("");

        /*
         * The variable "n" is used to limit the number of addmoddel's that
         * are performed in a single SNAC.  It will hopefully keep the size
         * of the SNAC below the maximum SNAC size.
         */

        if (!od)
                return -EINVAL;

        /* If we're waiting for an ack, we shouldn't do anything else */
        if (od->ssi.waiting_for_ack)
                return 0;

        /*
         * Compare the 2 lists and create an aim_ssi_tmp for each difference.
         * We should only send either additions, modifications, or deletions
         * before waiting for an acknowledgement.  So first do deletions, then
         * additions, then modifications.  Also, both the official and the local
         * list should be in ascending numerical order for the group ID#s and the
         * buddy ID#s, which makes things more efficient.  I think.
         */

        /* Deletions */
        if (!od->ssi.pending) {
                for (cur1=od->ssi.official; cur1 && (n < 15); cur1=cur1->next) {
                        if (!aim_ssi_itemlist_find(od->ssi.local, cur1->gid, cur1->bid)) {
                                n++;
                                new = g_new(struct aim_ssi_tmp, 1);
                                new->action = SNAC_SUBTYPE_FEEDBAG_DEL;
                                new->ack = 0xffff;
                                new->name = NULL;
                                new->item = cur1;
                                new->next = NULL;
                                if (od->ssi.pending) {
                                        for (cur=od->ssi.pending; cur->next; cur=cur->next);
                                        cur->next = new;
                                } else
                                        od->ssi.pending = new;
                                aim_ssi_item_debug_append(debugstr, "Deleting item ", cur1);
                        }
                }
        }

        /* Additions */
        if (!od->ssi.pending) {
                for (cur1=od->ssi.local; cur1 && (n < 15); cur1=cur1->next) {
                        if (!aim_ssi_itemlist_find(od->ssi.official, cur1->gid, cur1->bid)) {
                                n++;
                                new = g_new(struct aim_ssi_tmp, 1);
                                new->action = SNAC_SUBTYPE_FEEDBAG_ADD;
                                new->ack = 0xffff;
                                new->name = NULL;
                                new->item = cur1;
                                new->next = NULL;
                                if (od->ssi.pending) {
                                        for (cur=od->ssi.pending; cur->next; cur=cur->next);
                                        cur->next = new;
                                } else
                                        od->ssi.pending = new;
                                aim_ssi_item_debug_append(debugstr, "Adding item ", cur1);
                        }
                }
        }

        /* Modifications */
        if (!od->ssi.pending) {
                for (cur1=od->ssi.local; cur1 && (n < 15); cur1=cur1->next) {
                        cur2 = aim_ssi_itemlist_find(od->ssi.official, cur1->gid, cur1->bid);
                        if (cur2 && (aim_ssi_itemlist_cmp(cur1, cur2))) {
                                n++;
                                new = g_new(struct aim_ssi_tmp, 1);
                                new->action = SNAC_SUBTYPE_FEEDBAG_MOD;
                                new->ack = 0xffff;
                                new->name = NULL;
                                new->item = cur1;
                                new->next = NULL;
                                if (od->ssi.pending) {
                                        for (cur=od->ssi.pending; cur->next; cur=cur->next);
                                        cur->next = new;
                                } else
                                        od->ssi.pending = new;
                                aim_ssi_item_debug_append(debugstr, "Modifying item ", cur1);
                        }
                }
        }
        if (debugstr->len > 0) {
                purple_debug_info("oscar", "%s", debugstr->str);
                if (purple_debug_is_verbose()) {
                        g_string_truncate(debugstr, 0);
                        for (cur1 = od->ssi.local; cur1; cur1 = cur1->next) 
                                aim_ssi_item_debug_append(debugstr, "\t", cur1);
                        purple_debug_misc("oscar", "Dumping item list of account %s:\n%s",
                                purple_connection_get_account(od->gc)->username, debugstr->str);
                }
        }
        g_string_free(debugstr, TRUE);

        /* We're out of stuff to do, so tell the AIM servers we're done and exit */
        if (!od->ssi.pending) {
                if (od->ssi.in_transaction) {
                        aim_ssi_modend(od);
                        od->ssi.in_transaction = FALSE;
                }
                return 0;
        }

        /* If this is the first in a series of add/mod/del
         * requests then send the "begin transaction" message. */
        if (!od->ssi.in_transaction)
        {
                aim_ssi_modbegin(od);
                od->ssi.in_transaction = TRUE;
        }

        /* Make sure we don't send anything else between now
         * and when we receive the ack for the following operation */
        od->ssi.waiting_for_ack = TRUE;

        /* Now go mail off our data and wait 4 to 6 weeks */
        return aim_ssi_addmoddel(od);;
}

/**
 * Free all SSI data.
 *
 * This doesn't remove it from the server, that's different.
 *
 * @param od The oscar odion.
 * @return Return 0 if no errors, otherwise return the error number.
 */
static void
aim_ssi_freelist(OscarData *od)
{
        struct aim_ssi_item *cur, *del;
        struct aim_ssi_tmp *curtmp, *deltmp;

        cur = od->ssi.official;
        while (cur) {
                del = cur;
                cur = cur->next;
                g_free(del->name);
                aim_tlvlist_free(del->data);
                g_free(del);
        }

        cur = od->ssi.local;
        while (cur) {
                del = cur;
                cur = cur->next;
                g_free(del->name);
                aim_tlvlist_free(del->data);
                g_free(del);
        }

        curtmp = od->ssi.pending;
        while (curtmp) {
                deltmp = curtmp;
                curtmp = curtmp->next;
                g_free(deltmp);
        }

        od->ssi.numitems = 0;
        od->ssi.official = NULL;
        od->ssi.local = NULL;
        od->ssi.pending = NULL;
        od->ssi.timestamp = (time_t)0;
}

/**
 * This "cleans" the ssi list.  It does the following:
 * 1) Makes sure all buddies, permits, and denies have names.
 * 2) Makes sure that all buddies are in a group that exist.
 * 3) Deletes any empty groups
 *
 * @param od The oscar odion.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_cleanlist(OscarData *od)
{
        struct aim_ssi_item *cur, *next;

        if (!od)
                return -EINVAL;

        /* Delete any buddies, permits, or denies with empty names. */
        /* If there are any buddies directly in the master group, add them to a real group. */
        /* DESTROY any buddies that are directly in the master group. */
        /* Do the same for buddies that are in a non-existant group. */
        /* This will kind of mess up if you hit the item limit, but this function isn't too critical */
        cur = od->ssi.local;
        while (cur) {
                next = cur->next;
                if (!cur->name) {
                        if (cur->type == AIM_SSI_TYPE_BUDDY)
                                aim_ssi_delbuddy(od, NULL, NULL);
                        else if (cur->type == AIM_SSI_TYPE_PERMIT || cur->type == AIM_SSI_TYPE_DENY || cur->type == AIM_SSI_TYPE_ICQDENY)
                                aim_ssi_del_from_private_list(od, NULL, cur->type);
                } else if ((cur->type == AIM_SSI_TYPE_BUDDY) && ((cur->gid == 0x0000) || (!aim_ssi_itemlist_find(od->ssi.local, cur->gid, 0x0000)))) {
                        char *alias = aim_ssi_getalias(od->ssi.local, NULL, cur->name);
                        aim_ssi_addbuddy(od, cur->name, "orphans", NULL, alias, NULL, NULL, FALSE);
                        aim_ssi_delbuddy(od, cur->name, NULL);
                        g_free(alias);
                }
                cur = next;
        }

        /* Make sure there aren't any duplicate buddies in a group, or duplicate permits or denies */
        cur = od->ssi.local;
        while (cur) {
                if ((cur->type == AIM_SSI_TYPE_BUDDY) || (cur->type == AIM_SSI_TYPE_PERMIT) || (cur->type == AIM_SSI_TYPE_DENY))
                {
                        struct aim_ssi_item *cur2, *next2;
                        cur2 = cur->next;
                        while (cur2) {
                                next2 = cur2->next;
                                if ((cur->type == cur2->type) && (cur->gid == cur2->gid) && (cur->name != NULL) && (cur2->name != NULL) && (!oscar_util_name_compare(cur->name, cur2->name))) {
                                        aim_ssi_itemlist_del(&od->ssi.local, cur2);
                                }
                                cur2 = next2;
                        }
                }
                cur = cur->next;
        }

        /* If we've made any changes then sync our list with the server's */
        return aim_ssi_sync(od);
}

/**
 * Add a buddy to the list.
 *
 * @param od The oscar odion.
 * @param name The name of the item.
 * @param group The group of the item.
 * @param data A TLV list to use as the additional data for this item.
 * @param alias The alias/nickname of the item, or NULL.
 * @param comment The buddy comment for the item, or NULL.
 * @param smsnum The locally assigned SMS number, or NULL.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_addbuddy(OscarData *od, const char *name, const char *group, GSList *data, const char *alias, const char *comment, const char *smsnum, gboolean needauth)
{
        struct aim_ssi_item *parent;

        if (!od || !name || !group)
                return -EINVAL;

        /* Find the parent */
        if (!(parent = aim_ssi_itemlist_finditem(od->ssi.local, group, NULL, AIM_SSI_TYPE_GROUP))) {
                /* Find the parent's parent (the master group) */
                if (aim_ssi_itemlist_find(od->ssi.local, 0x0000, 0x0000) == NULL)
                        aim_ssi_itemlist_add(&od->ssi.local, NULL, 0x0000, 0x0000, AIM_SSI_TYPE_GROUP, NULL);

                /* Add the parent */
                parent = aim_ssi_itemlist_add(&od->ssi.local, group, 0xFFFF, 0x0000, AIM_SSI_TYPE_GROUP, NULL);

                /* Modify the parent's parent (the master group) */
                aim_ssi_itemlist_rebuildgroup(od->ssi.local, NULL);
        }

        /* Create a TLV list for the new buddy */
        if (needauth)
                aim_tlvlist_add_noval(&data, 0x0066);
        if (alias != NULL)
                aim_tlvlist_add_str(&data, 0x0131, alias);
        if (smsnum != NULL)
                aim_tlvlist_add_str(&data, 0x013a, smsnum);
        if (comment != NULL)
                aim_tlvlist_add_str(&data, 0x013c, comment);

        /* Add that bad boy */
        aim_ssi_itemlist_add(&od->ssi.local, name, parent->gid, 0xFFFF, AIM_SSI_TYPE_BUDDY, data);
        aim_tlvlist_free(data);

        /* Modify the parent group */
        aim_ssi_itemlist_rebuildgroup(od->ssi.local, group);

        /* Sync our local list with the server list */
        return aim_ssi_sync(od);
}

int
aim_ssi_add_to_private_list(OscarData *od, const char* name, guint16 list_type)
{
        if (!od || !name || !od->ssi.received_data)
                return -EINVAL;

        if (aim_ssi_itemlist_find(od->ssi.local, 0x0000, 0x0000) == NULL)
                aim_ssi_itemlist_add(&od->ssi.local, NULL, 0x0000, 0x0000, AIM_SSI_TYPE_GROUP, NULL);

        aim_ssi_itemlist_add(&od->ssi.local, name, 0x0000, 0xFFFF, list_type, NULL);
        return aim_ssi_sync(od);
}

int
aim_ssi_del_from_private_list(OscarData* od, const char* name, guint16 list_type)
{
        struct aim_ssi_item *del;

        if (!od)
                return -EINVAL;

        if (!(del = aim_ssi_itemlist_finditem(od->ssi.local, NULL, name, list_type)))
                return -EINVAL;

        aim_ssi_itemlist_del(&od->ssi.local, del);
        return aim_ssi_sync(od);
}

/**
 * Deletes a buddy from the list.
 *
 * @param od The oscar odion.
 * @param name The name of the item, or NULL.
 * @param group The group of the item, or NULL.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_delbuddy(OscarData *od, const char *name, const char *group)
{
        struct aim_ssi_item *del;

        if (!od)
                return -EINVAL;

        /* Find the buddy */
        if (!(del = aim_ssi_itemlist_finditem(od->ssi.local, group, name, AIM_SSI_TYPE_BUDDY)))
                return -EINVAL;

        /* Remove the item from the list */
        aim_ssi_itemlist_del(&od->ssi.local, del);

        /* Modify the parent group */
        aim_ssi_itemlist_rebuildgroup(od->ssi.local, group);

        /* Sync our local list with the server list */
        return aim_ssi_sync(od);
}

/**
 * Deletes a group from the list.
 *
 * @param od The oscar odion.
 * @param group The name of the group.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_delgroup(OscarData *od, const char *group)
{
        struct aim_ssi_item *del;
        aim_tlv_t *tlv;

        if (!od)
                return -EINVAL;

        /* Find the group */
        if (!(del = aim_ssi_itemlist_finditem(od->ssi.local, group, NULL, AIM_SSI_TYPE_GROUP)))
                return -EINVAL;

        /* Don't delete the group if it's not empty */
        tlv = aim_tlv_gettlv(del->data, 0x00c8, 1);
        if (tlv && tlv->length > 0)
                return -EINVAL;

        /* Remove the item from the list */
        aim_ssi_itemlist_del(&od->ssi.local, del);

        /* Modify the parent group */
        aim_ssi_itemlist_rebuildgroup(od->ssi.local, group);

        /* Sync our local list with the server list */
        return aim_ssi_sync(od);
}

/**
 * Move a buddy from one group to another group.  This basically just deletes the
 * buddy and re-adds it.
 *
 * @param od The oscar odion.
 * @param oldgn The group that the buddy is currently in.
 * @param newgn The group that the buddy should be moved in to.
 * @param bn The name of the buddy to be moved.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_movebuddy(OscarData *od, const char *oldgn, const char *newgn, const char *bn)
{
        struct aim_ssi_item *buddy;
        GSList *data;

        /* Find the buddy */
        buddy = aim_ssi_itemlist_finditem(od->ssi.local, oldgn, bn, AIM_SSI_TYPE_BUDDY);
        if (buddy == NULL)
                return -EINVAL;

        /* Make a copy of the buddy's TLV list */
        data = aim_tlvlist_copy(buddy->data);

        /* Delete the old item */
        aim_ssi_delbuddy(od, bn, oldgn);

        /* Add the new item using the EXACT SAME TLV list */
        aim_ssi_addbuddy(od, bn, newgn, data, NULL, NULL, NULL, FALSE);

        return 0;
}

/**
 * Change the alias stored on the server for a given buddy.
 *
 * @param od The oscar odion.
 * @param gn The group that the buddy is currently in.
 * @param bn The name of the buddy.
 * @param alias The new alias for the buddy, or NULL if you want to remove
 *        a buddy's comment.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_aliasbuddy(OscarData *od, const char *gn, const char *bn, const char *alias)
{
        struct aim_ssi_item *tmp;

        if (!od || !gn || !bn)
                return -EINVAL;

        if (!(tmp = aim_ssi_itemlist_finditem(od->ssi.local, gn, bn, AIM_SSI_TYPE_BUDDY)))
                return -EINVAL;

        /* Either add or remove the 0x0131 TLV from the TLV chain */
        if ((alias != NULL) && (strlen(alias) > 0))
                aim_tlvlist_replace_str(&tmp->data, 0x0131, alias);
        else
                aim_tlvlist_remove(&tmp->data, 0x0131);

        /* Sync our local list with the server list */
        return aim_ssi_sync(od);
}

/**
 * Change the comment stored on the server for a given buddy.
 *
 * @param od The oscar odion.
 * @param gn The group that the buddy is currently in.
 * @param bn The name of the buddy.
 * @param alias The new comment for the buddy, or NULL if you want to remove
 *        a buddy's comment.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_editcomment(OscarData *od, const char *gn, const char *bn, const char *comment)
{
        struct aim_ssi_item *tmp;

        if (!od || !gn || !bn)
                return -EINVAL;

        if (!(tmp = aim_ssi_itemlist_finditem(od->ssi.local, gn, bn, AIM_SSI_TYPE_BUDDY)))
                return -EINVAL;

        /* Either add or remove the 0x0131 TLV from the TLV chain */
        if ((comment != NULL) && (strlen(comment) > 0))
                aim_tlvlist_replace_str(&tmp->data, 0x013c, comment);
        else
                aim_tlvlist_remove(&tmp->data, 0x013c);

        /* Sync our local list with the server list */
        return aim_ssi_sync(od);
}

/**
 * Rename a group.
 *
 * @param od The oscar odion.
 * @param oldgn The old group name.
 * @param newgn The new group name.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_rename_group(OscarData *od, const char *oldgn, const char *newgn)
{
        struct aim_ssi_item *group;

        if (!od || !oldgn || !newgn)
                return -EINVAL;

        if (!(group = aim_ssi_itemlist_finditem(od->ssi.local, oldgn, NULL, AIM_SSI_TYPE_GROUP)))
                return -EINVAL;

        g_free(group->name);
        group->name = g_strdup(newgn);

        /* Sync our local list with the server list */
        return aim_ssi_sync(od);
}

/**
 * Stores your permit/deny setting on the server, and starts using it.
 *
 * @param od The oscar odion.
 * @param permdeny Your permit/deny setting. For ICQ accounts, it actually affects your visibility
 *        and has nothing to do with blocking. Can be one of the following:
 *        1 - Allow all users
 *        2 - Block all users
 *        3 - Allow only the users below
 *        4 - Block only the users below
 *        5 - Allow only users on my buddy list
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_setpermdeny(OscarData *od, guint8 permdeny)
{
        struct aim_ssi_item *tmp;

        if (!od || !od->ssi.received_data)
                return -EINVAL;

        /* Find the PDINFO item, or add it if it does not exist */
        if (!(tmp = aim_ssi_itemlist_finditem(od->ssi.local, NULL, NULL, AIM_SSI_TYPE_PDINFO))) {
                /* Make sure the master group exists */
                if (aim_ssi_itemlist_find(od->ssi.local, 0x0000, 0x0000) == NULL)
                        aim_ssi_itemlist_add(&od->ssi.local, NULL, 0x0000, 0x0000, AIM_SSI_TYPE_GROUP, NULL);

                tmp = aim_ssi_itemlist_add(&od->ssi.local, NULL, 0x0000, 0xFFFF, AIM_SSI_TYPE_PDINFO, NULL);
        }

        /* Need to add the 0x00ca TLV to the TLV chain */
        aim_tlvlist_replace_8(&tmp->data, 0x00ca, permdeny);

        /* Sync our local list with the server list */
        return aim_ssi_sync(od);
}

/**
 * Set buddy icon information
 *
 * @param od The oscar odion.
 * @param iconcsum The MD5 checksum of the icon you are using.
 * @param iconcsumlen Length of the MD5 checksum given above.  Should be 0x10 bytes.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_seticon(OscarData *od, const guint8 *iconsum, guint8 iconsumlen)
{
        struct aim_ssi_item *tmp;
        guint8 *csumdata;

        if (!od || !iconsum || !iconsumlen || !od->ssi.received_data)
                return -EINVAL;

        /* Find the ICONINFO item, or add it if it does not exist */
        if (!(tmp = aim_ssi_itemlist_finditem(od->ssi.local, NULL, "1", AIM_SSI_TYPE_ICONINFO))) {
                /* Make sure the master group exists */
                if (aim_ssi_itemlist_find(od->ssi.local, 0x0000, 0x0000) == NULL)
                        aim_ssi_itemlist_add(&od->ssi.local, NULL, 0x0000, 0x0000, AIM_SSI_TYPE_GROUP, NULL);

                tmp = aim_ssi_itemlist_add(&od->ssi.local, "1", 0x0000, 0xFFFF, AIM_SSI_TYPE_ICONINFO, NULL);
        }

        /* Need to add the 0x00d5 TLV to the TLV chain */
        csumdata = (guint8 *)g_malloc((iconsumlen+2)*sizeof(guint8));
        (void)aimutil_put8(&csumdata[0], 0x00);
        (void)aimutil_put8(&csumdata[1], iconsumlen);
        memcpy(&csumdata[2], iconsum, iconsumlen);
        aim_tlvlist_replace_raw(&tmp->data, 0x00d5, (iconsumlen+2) * sizeof(guint8), csumdata);
        g_free(csumdata);

        /* Need to add the 0x0131 TLV to the TLV chain, used to cache the icon */
        aim_tlvlist_replace_noval(&tmp->data, 0x0131);

        /* Sync our local list with the server list */
        aim_ssi_sync(od);
        return 0;
}

/**
 * Remove a reference to a server stored buddy icon.  This will make your
 * icon stop showing up to other people.
 *
 * Really this function just sets the icon to a dummy value.  It's weird...
 * but I think the dummy value basically means "I don't have an icon!"
 *
 * @param od The oscar session.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_delicon(OscarData *od)
{
        const guint8 csumdata[] = {0x02, 0x01, 0xd2, 0x04, 0x72};

        return aim_ssi_seticon(od, csumdata, 5);
}

/**
 * Stores your setting for various SSI settings.  Whether you
 * should show up as idle or not, etc.
 *
 * @param od The oscar odion.
 * @param presence A bitmask of the first 32 entries [0-31] from
 *        http://dev.aol.com/aim/oscar/#FEEDBAG__BUDDY_PREFS
 *        0x00000002 - Hide "eBuddy group" (whatever that is)
 *        0x00000400 - Allow others to see your idle time
 *        0x00020000 - Don't show Recent Buddies
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_setpresence(OscarData *od, guint32 presence) {
        struct aim_ssi_item *tmp;

        if (!od || !od->ssi.received_data)
                return -EINVAL;

        /* Find the PRESENCEPREFS item, or add it if it does not exist */
        if (!(tmp = aim_ssi_itemlist_finditem(od->ssi.local, NULL, NULL, AIM_SSI_TYPE_PRESENCEPREFS))) {
                /* Make sure the master group exists */
                if (aim_ssi_itemlist_find(od->ssi.local, 0x0000, 0x0000) == NULL)
                        aim_ssi_itemlist_add(&od->ssi.local, NULL, 0x0000, 0x0000, AIM_SSI_TYPE_GROUP, NULL);

                tmp = aim_ssi_itemlist_add(&od->ssi.local, NULL, 0x0000, 0xFFFF, AIM_SSI_TYPE_PRESENCEPREFS, NULL);
        }

        /* Need to add the x00c9 TLV to the TLV chain */
        aim_tlvlist_replace_32(&tmp->data, 0x00c9, presence);

        /* Sync our local list with the server list */
        return aim_ssi_sync(od);
}

/*
 * Subtype 0x0002 - Request SSI Rights.
 */
int aim_ssi_reqrights(OscarData *od)
{
        FlapConnection *conn;

        if (!od || !(conn = flap_connection_findbygroup(od, SNAC_FAMILY_FEEDBAG)))
                return -EINVAL;

        aim_genericreq_n_snacid(od, conn, SNAC_FAMILY_FEEDBAG, SNAC_SUBTYPE_FEEDBAG_REQRIGHTS);

        return 0;
}

/*
 * Subtype 0x0003 - SSI Rights Information.
 */
static int parserights(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
        int ret = 0, i;
        aim_rxcallback_t userfunc;
        GSList *tlvlist;
        aim_tlv_t *tlv;
        ByteStream bstream;
        guint16 *maxitems;

        /* This SNAC is made up of a bunch of TLVs */
        tlvlist = aim_tlvlist_read(bs);

        /* TLV 0x0004 contains the maximum number of each item */
        if (!(tlv = aim_tlv_gettlv(tlvlist, 0x0004, 1))) {
                aim_tlvlist_free(tlvlist);
                return 0;
        }

        byte_stream_init(&bstream, tlv->value, tlv->length);

        maxitems = (guint16 *)g_malloc((tlv->length/2)*sizeof(guint16));

        for (i=0; i<(tlv->length/2); i++)
                maxitems[i] = byte_stream_get16(&bstream);

        if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
                ret = userfunc(od, conn, frame, tlv->length/2, maxitems);

        aim_tlvlist_free(tlvlist);
        g_free(maxitems);

        return ret;
}

/*
 * Subtype 0x0004 - Request SSI Data when you don't have a timestamp and
 * revision number.
 *
 */
int aim_ssi_reqdata(OscarData *od)
{
        FlapConnection *conn;

        if (!od || !(conn = flap_connection_findbygroup(od, SNAC_FAMILY_FEEDBAG)))
                return -EINVAL;

        /* Free any current data, just in case */
        aim_ssi_freelist(od);

        aim_genericreq_n_snacid(od, conn, SNAC_FAMILY_FEEDBAG, SNAC_SUBTYPE_FEEDBAG_REQDATA);

        return 0;
}

/*
 * Subtype 0x0006 - SSI Data.
 */
static int parsedata(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
        int ret = 0;
        aim_rxcallback_t userfunc;
        guint8 fmtver; /* guess */
        guint16 namelen, gid, bid, type;
        char *name;
        GSList *data;
        GString *debugstr = g_string_new("");

        fmtver = byte_stream_get8(bs); /* Version of ssi data.  Should be 0x00 */
        od->ssi.numitems += byte_stream_get16(bs); /* # of items in this SSI SNAC */

        /* Read in the list */
        while (byte_stream_bytes_left(bs) > 4) { /* last four bytes are timestamp */
                if ((namelen = byte_stream_get16(bs)))
                        name = byte_stream_getstr(bs, namelen);
                else
                        name = NULL;
                gid = byte_stream_get16(bs);
                bid = byte_stream_get16(bs);
                type = byte_stream_get16(bs);
                data = aim_tlvlist_readlen(bs, byte_stream_get16(bs));
                aim_ssi_item_debug_append(debugstr, "\t", aim_ssi_itemlist_add(&od->ssi.official, name, gid, bid, type, data));
                g_free(name);
                aim_tlvlist_free(data);
        }
        purple_debug_misc("oscar", "Reading items from tlvlist for account %s:\n%s",
                purple_connection_get_account(od->gc)->username, debugstr->str);
        g_string_free(debugstr, TRUE);

        /* Read in the timestamp */
        od->ssi.timestamp = byte_stream_get32(bs);

        if (!(snac->flags & 0x0001)) {
                /* Make a copy of the list */
                struct aim_ssi_item *cur;
                for (cur=od->ssi.official; cur; cur=cur->next)
                        aim_ssi_itemlist_add(&od->ssi.local, cur->name, cur->gid, cur->bid, cur->type, cur->data);

                od->ssi.received_data = TRUE;

                if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
                        ret = userfunc(od, conn, frame, fmtver, od->ssi.numitems, od->ssi.timestamp);
        }

        return ret;
}

/*
 * Subtype 0x0007 - SSI Activate Data.
 *
 * Should be sent after receiving 13/6 or 13/f to tell the server you
 * are ready to begin using the list.  It will promptly give you the
 * presence information for everyone in your list and put your permit/deny
 * settings into effect.
 *
 */
int aim_ssi_enable(OscarData *od)
{
        FlapConnection *conn;

        if (!od || !(conn = flap_connection_findbygroup(od, SNAC_FAMILY_FEEDBAG)))
                return -EINVAL;

        aim_genericreq_n(od, conn, SNAC_FAMILY_FEEDBAG, 0x0007);

        return 0;
}

/*
 * Subtype 0x0008/0x0009/0x000a - SSI Add/Mod/Del Item(s).
 *
 * Sends the SNAC to add, modify, or delete items from the server-stored
 * information.  These 3 SNACs all have an identical structure.  The only
 * difference is the subtype that is set for the SNAC.
 *
 */
static int aim_ssi_addmoddel(OscarData *od)
{
        FlapConnection *conn;
        ByteStream bs;
        aim_snacid_t snacid;
        int bslen;
        struct aim_ssi_tmp *cur;

        if (!od || !(conn = flap_connection_findbygroup(od, SNAC_FAMILY_FEEDBAG)) || !od->ssi.pending || !od->ssi.pending->item)
                return -EINVAL;

        /* Calculate total SNAC size */
        bslen = 0;
        for (cur=od->ssi.pending; cur; cur=cur->next) {
                bslen += 10; /* For length, GID, BID, type, and length */
                if (cur->item->name)
                        bslen += strlen(cur->item->name);
                if (cur->item->data)
                        bslen += aim_tlvlist_size(cur->item->data);
        }

        byte_stream_new(&bs, bslen);

        for (cur=od->ssi.pending; cur; cur=cur->next) {
                byte_stream_put16(&bs, cur->item->name ? strlen(cur->item->name) : 0);
                if (cur->item->name)
                        byte_stream_putstr(&bs, cur->item->name);
                byte_stream_put16(&bs, cur->item->gid);
                byte_stream_put16(&bs, cur->item->bid);
                byte_stream_put16(&bs, cur->item->type);
                byte_stream_put16(&bs, cur->item->data ? aim_tlvlist_size(cur->item->data) : 0);
                if (cur->item->data)
                        aim_tlvlist_write(&bs, &cur->item->data);
        }

        snacid = aim_cachesnac(od, SNAC_FAMILY_FEEDBAG, od->ssi.pending->action, 0x0000, NULL, 0);
        flap_connection_send_snac(od, conn, SNAC_FAMILY_FEEDBAG, od->ssi.pending->action, snacid, &bs);

        byte_stream_destroy(&bs);

        return 0;
}

/*
 * Subtype 0x0008 - Incoming SSI add.
 *
 * Sent by the server, for example, when someone is added to
 * your "Recent Buddies" group.
 */
static int parseadd(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
        int ret = 0;
        aim_rxcallback_t userfunc;
        char *name;
        guint16 len, gid, bid, type;
        GSList *data;

        while (byte_stream_bytes_left(bs)) {
                if ((len = byte_stream_get16(bs)))
                        name = byte_stream_getstr(bs, len);
                else
                        name = NULL;
                gid = byte_stream_get16(bs);
                bid = byte_stream_get16(bs);
                type = byte_stream_get16(bs);
                if ((len = byte_stream_get16(bs)))
                        data = aim_tlvlist_readlen(bs, len);
                else
                        data = NULL;

                aim_ssi_itemlist_add(&od->ssi.local, name, gid, bid, type, data);
                aim_ssi_itemlist_add(&od->ssi.official, name, gid, bid, type, data);
                aim_tlvlist_free(data);

                if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
                        ret = userfunc(od, conn, frame, snac->subtype, type, name);

                g_free(name);
        }

        return ret;
}

/*
 * Subtype 0x0009 - Incoming SSI mod.
 */
static int parsemod(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
        int ret = 0;
        aim_rxcallback_t userfunc;
        char *name;
        guint16 len, gid, bid, type;
        GSList *data;
        struct aim_ssi_item *item;

        while (byte_stream_bytes_left(bs)) {
                if ((len = byte_stream_get16(bs)))
                        name = byte_stream_getstr(bs, len);
                else
                        name = NULL;
                gid = byte_stream_get16(bs);
                bid = byte_stream_get16(bs);
                type = byte_stream_get16(bs);
                if ((len = byte_stream_get16(bs)))
                        data = aim_tlvlist_readlen(bs, len);
                else
                        data = NULL;

                /* Replace the 2 local items with the given one */
                if ((item = aim_ssi_itemlist_find(od->ssi.local, gid, bid))) {
                        item->type = type;
                        g_free(item->name);
                        item->name = g_strdup(name);
                        aim_tlvlist_free(item->data);
                        item->data = aim_tlvlist_copy(data);
                }

                if ((item = aim_ssi_itemlist_find(od->ssi.official, gid, bid))) {
                        item->type = type;
                        g_free(item->name);
                        item->name = g_strdup(name);
                        aim_tlvlist_free(item->data);
                        item->data = aim_tlvlist_copy(data);
                }

                if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
                        ret = userfunc(od, conn, frame, snac->subtype, type, name);

                g_free(name);
                aim_tlvlist_free(data);
        }

        return ret;
}

/*
 * Subtype 0x000a - Incoming SSI del.
 *
 * XXX - It would probably be good for the client to actually do something when it gets this.
 */
static int parsedel(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
        int ret = 0;
        aim_rxcallback_t userfunc;
        guint16 gid, bid;
        struct aim_ssi_item *del;

        while (byte_stream_bytes_left(bs)) {
                byte_stream_advance(bs, byte_stream_get16(bs));
                gid = byte_stream_get16(bs);
                bid = byte_stream_get16(bs);
                byte_stream_get16(bs);
                byte_stream_advance(bs, byte_stream_get16(bs));

                if ((del = aim_ssi_itemlist_find(od->ssi.local, gid, bid)))
                        aim_ssi_itemlist_del(&od->ssi.local, del);
                if ((del = aim_ssi_itemlist_find(od->ssi.official, gid, bid)))
                        aim_ssi_itemlist_del(&od->ssi.official, del);

                if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
                        ret = userfunc(od, conn, frame);
        }

        return ret;
}

/*
 * Subtype 0x000e - SSI Add/Mod/Del Ack.
 *
 * Response to add, modify, or delete SNAC (sent with aim_ssi_addmoddel).
 *
 */
static int parseack(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
        int ret = 0;
        aim_rxcallback_t userfunc;
        struct aim_ssi_tmp *cur, *del;

        /* Read in the success/failure flags from the ack SNAC */
        cur = od->ssi.pending;
        while (cur && (byte_stream_bytes_left(bs)>0)) {
                cur->ack = byte_stream_get16(bs);
                cur = cur->next;
        }

        /*
         * If outcome is 0, then add the item to the item list, or replace the other item,
         * or remove the old item.  If outcome is non-zero, then remove the item from the
         * local list, or unmodify it, or add it.
         */
        for (cur=od->ssi.pending; (cur && (cur->ack != 0xffff)); cur=cur->next) {
        if (cur->item) {
                if (cur->ack) {
                        /* Our action was unsuccessful, so change the local list back to how it was */
                        if (cur->action == SNAC_SUBTYPE_FEEDBAG_ADD) {
                                /* Remove the item from the local list */
                                /* Make sure cur->item is still valid memory */
                                if (aim_ssi_itemlist_valid(od->ssi.local, cur->item)) {
                                        cur->name = g_strdup(cur->item->name);
                                        aim_ssi_itemlist_del(&od->ssi.local, cur->item);
                                }
                                cur->item = NULL;

                        } else if (cur->action == SNAC_SUBTYPE_FEEDBAG_MOD) {
                                /* Replace the local item with the item from the official list */
                                if (aim_ssi_itemlist_valid(od->ssi.local, cur->item)) {
                                        struct aim_ssi_item *cur1;
                                        if ((cur1 = aim_ssi_itemlist_find(od->ssi.official, cur->item->gid, cur->item->bid))) {
                                                g_free(cur->item->name);
                                                cur->item->name = g_strdup(cur1->name);
                                                aim_tlvlist_free(cur->item->data);
                                                cur->item->data = aim_tlvlist_copy(cur1->data);
                                        }
                                } else
                                        cur->item = NULL;

                        } else if (cur->action == SNAC_SUBTYPE_FEEDBAG_DEL) {
                                /* Add the item back into the local list */
                                if (aim_ssi_itemlist_valid(od->ssi.official, cur->item)) {
                                        aim_ssi_itemlist_add(&od->ssi.local, cur->item->name, cur->item->gid, cur->item->bid, cur->item->type, cur->item->data);
                                } else
                                        cur->item = NULL;
                        }

                } else {
                        /* Do the exact opposite */
                        if (cur->action == SNAC_SUBTYPE_FEEDBAG_ADD) {
                        /* Add the local item to the official list */
                                if (aim_ssi_itemlist_valid(od->ssi.local, cur->item)) {
                                        aim_ssi_itemlist_add(&od->ssi.official, cur->item->name, cur->item->gid, cur->item->bid, cur->item->type, cur->item->data);
                                } else
                                        cur->item = NULL;

                        } else if (cur->action == SNAC_SUBTYPE_FEEDBAG_MOD) {
                                /* Replace the official item with the item from the local list */
                                if (aim_ssi_itemlist_valid(od->ssi.local, cur->item)) {
                                        struct aim_ssi_item *cur1;
                                        if ((cur1 = aim_ssi_itemlist_find(od->ssi.official, cur->item->gid, cur->item->bid))) {
                                                g_free(cur1->name);
                                                cur1->name = g_strdup(cur->item->name);
                                                aim_tlvlist_free(cur1->data);
                                                cur1->data = aim_tlvlist_copy(cur->item->data);
                                        }
                                } else
                                        cur->item = NULL;

                        } else if (cur->action == SNAC_SUBTYPE_FEEDBAG_DEL) {
                                /* Remove the item from the official list */
                                if (aim_ssi_itemlist_valid(od->ssi.official, cur->item))
                                        aim_ssi_itemlist_del(&od->ssi.official, cur->item);
                                cur->item = NULL;
                        }

                }
        } /* End if (cur->item) */
        } /* End for loop */

        if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
                ret = userfunc(od, conn, frame, od->ssi.pending);

        /* Free all aim_ssi_tmp's with an outcome */
        cur = od->ssi.pending;
        while (cur && (cur->ack != 0xffff)) {
                del = cur;
                cur = cur->next;
                g_free(del->name);
                g_free(del);
        }
        od->ssi.pending = cur;

        /* If we're not waiting for any more acks, then send more SNACs */
        if (!od->ssi.pending) {
                od->ssi.waiting_for_ack = FALSE;
                aim_ssi_sync(od);
        }

        return ret;
}

/*
 * Subtype 0x000f - SSI Data Unchanged.
 *
 * Response to aim_ssi_reqifchanged() if the server-side data is not newer than
 * posted local stamp/revision.
 *
 */
static int parsedataunchanged(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
        int ret = 0;
        aim_rxcallback_t userfunc;

        od->ssi.received_data = TRUE;

        if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
                ret = userfunc(od, conn, frame);

        return ret;
}

/*
 * Subtype 0x0011 - SSI Begin Data Modification.
 *
 * Tell the server you're going to start modifying data.  This marks
 * the beginning of a transaction.
 */
int aim_ssi_modbegin(OscarData *od)
{
        FlapConnection *conn;

        if (!od || !(conn = flap_connection_findbygroup(od, SNAC_FAMILY_FEEDBAG)))
                return -EINVAL;

        aim_genericreq_n(od, conn, SNAC_FAMILY_FEEDBAG, SNAC_SUBTYPE_FEEDBAG_EDITSTART);

        return 0;
}

/*
 * Subtype 0x0012 - SSI End Data Modification.
 *
 * Tell the server you're finished modifying data.  The marks the end
 * of a transaction.
 */
int aim_ssi_modend(OscarData *od)
{
        FlapConnection *conn;

        if (!od || !(conn = flap_connection_findbygroup(od, SNAC_FAMILY_FEEDBAG)))
                return -EINVAL;

        aim_genericreq_n(od, conn, SNAC_FAMILY_FEEDBAG, SNAC_SUBTYPE_FEEDBAG_EDITSTOP);

        return 0;
}

/*
 * Subtype 0x0015 - Receive an authorization grant
 */
static int receiveauthgrant(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
        int ret = 0;
        aim_rxcallback_t userfunc;
        guint16 tmp;
        char *bn, *msg, *tmpstr;

        /* Read buddy name */
        tmp = byte_stream_get8(bs);
        if (!tmp) {
                purple_debug_warning("oscar", "Dropping auth grant SNAC "
                                "because username was empty\n");
                return 0;
        }
        bn = byte_stream_getstr(bs, tmp);
        if (!g_utf8_validate(bn, -1, NULL)) {
                purple_debug_warning("oscar", "Dropping auth grant SNAC "
                                "because the username was not valid UTF-8\n");
                g_free(bn);
        }

        /* Read message */
        tmp = byte_stream_get16(bs);
        if (tmp) {
                msg = byte_stream_getstr(bs, tmp);
                if (!g_utf8_validate(msg, -1, NULL)) {
                        /* Ugh, msg isn't UTF8.  Let's salvage. */
                        purple_debug_warning("oscar", "Got non-UTF8 message in auth "
                                        "grant from %s\n", bn);
                        tmpstr = purple_utf8_salvage(msg);
                        g_free(msg);
                        msg = tmpstr;
                }
        } else
                msg = NULL;

        /* Unknown */
        tmp = byte_stream_get16(bs);

        if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
                ret = userfunc(od, conn, frame, bn, msg);

        g_free(bn);
        g_free(msg);

        return ret;
}

/*
 * Subtype 0x0018 - Send authorization request
 *
 * Sends a request for authorization to the given contact.  The request will either be
 * granted, denied, or dropped.
 *
 */
int aim_ssi_sendauthrequest(OscarData *od, const char *bn, const char *msg)
{
        FlapConnection *conn;
        ByteStream bs;
        aim_snacid_t snacid;

        if (!od || !(conn = flap_connection_findbygroup(od, SNAC_FAMILY_FEEDBAG)) || !bn)
                return -EINVAL;

        byte_stream_new(&bs, 1+strlen(bn) + 2+(msg ? strlen(msg)+1 : 0) + 2);

        /* Username */
        byte_stream_put8(&bs, strlen(bn));
        byte_stream_putstr(&bs, bn);

        /* Message (null terminated) */
        byte_stream_put16(&bs, msg ? strlen(msg) : 0);
        if (msg) {
                byte_stream_putstr(&bs, msg);
                byte_stream_put8(&bs, 0x00);
        }

        /* Unknown */
        byte_stream_put16(&bs, 0x0000);

        snacid = aim_cachesnac(od, SNAC_FAMILY_FEEDBAG, SNAC_SUBTYPE_FEEDBAG_SENDAUTHREQ, 0x0000, NULL, 0);
        flap_connection_send_snac(od, conn, SNAC_FAMILY_FEEDBAG, SNAC_SUBTYPE_FEEDBAG_SENDAUTHREQ, snacid, &bs);

        byte_stream_destroy(&bs);

        return 0;
}

/*
 * Subtype 0x0019 - Receive an authorization request
 */
static int receiveauthrequest(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
        int ret = 0;
        aim_rxcallback_t userfunc;
        guint16 tmp;
        char *bn, *msg, *tmpstr;

        /* Read buddy name */
        tmp = byte_stream_get8(bs);
        if (!tmp) {
                purple_debug_warning("oscar", "Dropping auth request SNAC "
                                "because username was empty\n");
                return 0;
        }
        bn = byte_stream_getstr(bs, tmp);
        if (!g_utf8_validate(bn, -1, NULL)) {
                purple_debug_warning("oscar", "Dropping auth request SNAC "
                                "because the username was not valid UTF-8\n");
                g_free(bn);
        }

        /* Read message */
        tmp = byte_stream_get16(bs);
        if (tmp) {
                msg = byte_stream_getstr(bs, tmp);
                if (!g_utf8_validate(msg, -1, NULL)) {
                        /* Ugh, msg isn't UTF8.  Let's salvage. */
                        purple_debug_warning("oscar", "Got non-UTF8 message in auth "
                                        "request from %s\n", bn);
                        tmpstr = purple_utf8_salvage(msg);
                        g_free(msg);
                        msg = tmpstr;
                }
        } else
                msg = NULL;

        /* Unknown */
        tmp = byte_stream_get16(bs);

        if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
                ret = userfunc(od, conn, frame, bn, msg);

        g_free(bn);
        g_free(msg);

        return ret;
}

/*
 * Subtype 0x001a - Send authorization reply
 *
 * Sends a reply to a request for authorization.  The reply can either
 * grant authorization or deny authorization.
 *
 * if reply=0x00 then deny
 * if reply=0x01 then grant
 *
 */
int aim_ssi_sendauthreply(OscarData *od, const char *bn, guint8 reply, const char *msg)
{
        FlapConnection *conn;
        ByteStream bs;
        aim_snacid_t snacid;

        if (!od || !(conn = flap_connection_findbygroup(od, SNAC_FAMILY_FEEDBAG)) || !bn)
                return -EINVAL;

        byte_stream_new(&bs, 1+strlen(bn) + 1 + 2+(msg ? (strlen(msg)+1) : 0) + 2);

        /* Username */
        byte_stream_put8(&bs, strlen(bn));
        byte_stream_putstr(&bs, bn);

        /* Grant or deny */
        byte_stream_put8(&bs, reply);

        /* Message (null terminated) */
        byte_stream_put16(&bs, msg ? (strlen(msg)+1) : 0);
        if (msg) {
                byte_stream_putstr(&bs, msg);
                byte_stream_put8(&bs, 0x00);
        }

        /* Unknown */
        byte_stream_put16(&bs, 0x0000);

        snacid = aim_cachesnac(od, SNAC_FAMILY_FEEDBAG, SNAC_SUBTYPE_FEEDBAG_SENDAUTHREP, 0x0000, NULL, 0);
        flap_connection_send_snac(od, conn, SNAC_FAMILY_FEEDBAG, SNAC_SUBTYPE_FEEDBAG_SENDAUTHREP, snacid, &bs);

        byte_stream_destroy(&bs);

        return 0;
}

/*
 * Subtype 0x001b - Receive an authorization reply
 *
 * You get this bad boy when other people respond to the authorization
 * request that you have previously sent them.
 */
static int receiveauthreply(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
        int ret = 0;
        aim_rxcallback_t userfunc;
        guint16 tmp;
        guint8 reply;
        char *bn, *msg, *tmpstr;

        /* Read buddy name */
        tmp = byte_stream_get8(bs);
        if (!tmp) {
                purple_debug_warning("oscar", "Dropping auth reply SNAC "
                                "because username was empty\n");
                return 0;
        }
        bn = byte_stream_getstr(bs, tmp);
        if (!g_utf8_validate(bn, -1, NULL)) {
                purple_debug_warning("oscar", "Dropping auth reply SNAC "
                                "because the username was not valid UTF-8\n");
                g_free(bn);
        }

        /* Read reply */
        reply = byte_stream_get8(bs);

        /* Read message */
        tmp = byte_stream_get16(bs);
        if (tmp) {
                msg = byte_stream_getstr(bs, tmp);
                if (!g_utf8_validate(msg, -1, NULL)) {
                        /* Ugh, msg isn't UTF8.  Let's salvage. */
                        purple_debug_warning("oscar", "Got non-UTF8 message in auth "
                                        "reply from %s\n", bn);
                        tmpstr = purple_utf8_salvage(msg);
                        g_free(msg);
                        msg = tmpstr;
                }
        } else
                msg = NULL;

        /* Unknown */
        tmp = byte_stream_get16(bs);

        if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
                ret = userfunc(od, conn, frame, bn, reply, msg);

        g_free(bn);
        g_free(msg);

        return ret;
}

/*
 * Subtype 0x001c - Receive a message telling you someone added you to their list.
 */
static int receiveadded(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
        int ret = 0;
        aim_rxcallback_t userfunc;
        guint16 tmp;
        char *bn;

        /* Read buddy name */
        tmp = byte_stream_get8(bs);
        if (!tmp) {
                purple_debug_warning("oscar", "Dropping 'you were added' SNAC "
                                "because username was empty\n");
                return 0;
        }
        bn = byte_stream_getstr(bs, tmp);
        if (!g_utf8_validate(bn, -1, NULL)) {
                purple_debug_warning("oscar", "Dropping 'you were added' SNAC "
                                "because the username was not valid UTF-8\n");
                g_free(bn);
        }

        if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
                ret = userfunc(od, conn, frame, bn);

        g_free(bn);

        return ret;
}

/*
 * If we're on ICQ, then AIM_SSI_TYPE_DENY is used for the "permanently invisible" list.
 * AIM_SSI_TYPE_ICQDENY is used for blocking users instead.
 */
guint16
aim_ssi_getdenyentrytype(OscarData* od)
{
        return od->icq ? AIM_SSI_TYPE_ICQDENY : AIM_SSI_TYPE_DENY;
}

static int
snachandler(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
        if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_RIGHTSINFO)
                return parserights(od, conn, mod, frame, snac, bs);
        else if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_LIST)
                return parsedata(od, conn, mod, frame, snac, bs);
        else if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_ADD)
                return parseadd(od, conn, mod, frame, snac, bs);
        else if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_MOD)
                return parsemod(od, conn, mod, frame, snac, bs);
        else if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_DEL)
                return parsedel(od, conn, mod, frame, snac, bs);
        else if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_SRVACK)
                return parseack(od, conn, mod, frame, snac, bs);
        else if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_NOLIST)
                return parsedataunchanged(od, conn, mod, frame, snac, bs);
        else if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_RECVAUTH)
                return receiveauthgrant(od, conn, mod, frame, snac, bs);
        else if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_RECVAUTHREQ)
                return receiveauthrequest(od, conn, mod, frame, snac, bs);
        else if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_RECVAUTHREP)
                return receiveauthreply(od, conn, mod, frame, snac, bs);
        else if (snac->subtype == SNAC_SUBTYPE_FEEDBAG_ADDED)
                return receiveadded(od, conn, mod, frame, snac, bs);

        return 0;
}

static void
ssi_shutdown(OscarData *od, aim_module_t *mod)
{
        aim_ssi_freelist(od);
}

int
ssi_modfirst(OscarData *od, aim_module_t *mod)
{
        mod->family = SNAC_FAMILY_FEEDBAG;
        mod->version = 0x0004;
        mod->toolid = 0x0110;
        mod->toolversion = 0x0629;
        mod->flags = 0;
        strncpy(mod->name, "feedbag", sizeof(mod->name));
        mod->snachandler = snachandler;
        mod->shutdown = ssi_shutdown;

        return 0;
}