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Diffstat (limited to 'libpurple/protocols/oscar/tlv.c')
-rw-r--r--libpurple/protocols/oscar/tlv.c893
1 files changed, 893 insertions, 0 deletions
diff --git a/libpurple/protocols/oscar/tlv.c b/libpurple/protocols/oscar/tlv.c
new file mode 100644
index 0000000000..44d1b32b07
--- /dev/null
+++ b/libpurple/protocols/oscar/tlv.c
@@ -0,0 +1,893 @@
+/*
+ * Gaim'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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+
+#include "oscar.h"
+
+static aim_tlv_t *
+createtlv(guint16 type, guint16 length, guint8 *value)
+{
+ aim_tlv_t *ret;
+
+ ret = g_new(aim_tlv_t, 1);
+ ret->type = type;
+ ret->length = length;
+ ret->value = value;
+
+ return ret;
+}
+
+static void
+freetlv(aim_tlv_t **oldtlv)
+{
+
+ if (!oldtlv || !*oldtlv)
+ return;
+
+ free((*oldtlv)->value);
+ free(*oldtlv);
+ *oldtlv = NULL;
+
+ return;
+}
+
+/**
+ * Read a TLV chain from a buffer.
+ *
+ * Reads and parses a series of TLV patterns from a data buffer; the
+ * returned structure is manipulatable with the rest of the TLV
+ * routines. When done with a TLV chain, aim_tlvlist_free() should
+ * be called to free the dynamic substructures.
+ *
+ * XXX There should be a flag setable here to have the tlvlist contain
+ * bstream references, so that at least the ->value portion of each
+ * element doesn't need to be malloc/memcpy'd. This could prove to be
+ * just as efficient as the in-place TLV parsing used in a couple places
+ * in libfaim.
+ *
+ * @param bs Input bstream
+ * @return Return the TLV chain read
+ */
+aim_tlvlist_t *aim_tlvlist_read(ByteStream *bs)
+{
+ aim_tlvlist_t *list = NULL, *cur;
+
+ while (byte_stream_empty(bs) > 0) {
+ guint16 type, length;
+
+ type = byte_stream_get16(bs);
+ length = byte_stream_get16(bs);
+
+#if 0 /* temporarily disabled until I know if they're still doing it or not */
+ /*
+ * Okay, so now AOL has decided that any TLV of
+ * type 0x0013 can only be two bytes, despite
+ * what the actual given length is. So here
+ * we dump any invalid TLVs of that sort. Hopefully
+ * there's no special cases to this special case.
+ * - mid (30jun2000)
+ */
+ if ((type == 0x0013) && (length != 0x0002))
+ length = 0x0002;
+#else
+ if (0)
+ ;
+#endif
+ else {
+
+ if (length > byte_stream_empty(bs)) {
+ aim_tlvlist_free(&list);
+ return NULL;
+ }
+
+ cur = g_new0(aim_tlvlist_t, 1);
+ cur->tlv = createtlv(type, length, NULL);
+ if (cur->tlv->length > 0) {
+ cur->tlv->value = byte_stream_getraw(bs, length);
+ if (!cur->tlv->value) {
+ freetlv(&cur->tlv);
+ free(cur);
+ aim_tlvlist_free(&list);
+ return NULL;
+ }
+ }
+
+ cur->next = list;
+ list = cur;
+ }
+ }
+
+ return list;
+}
+
+/**
+ * Read a TLV chain from a buffer.
+ *
+ * Reads and parses a series of TLV patterns from a data buffer; the
+ * returned structure is manipulatable with the rest of the TLV
+ * routines. When done with a TLV chain, aim_tlvlist_free() should
+ * be called to free the dynamic substructures.
+ *
+ * XXX There should be a flag setable here to have the tlvlist contain
+ * bstream references, so that at least the ->value portion of each
+ * element doesn't need to be malloc/memcpy'd. This could prove to be
+ * just as efficient as the in-place TLV parsing used in a couple places
+ * in libfaim.
+ *
+ * @param bs Input bstream
+ * @param num The max number of TLVs that will be read, or -1 if unlimited.
+ * There are a number of places where you want to read in a tlvchain,
+ * but the chain is not at the end of the SNAC, and the chain is
+ * preceded by the number of TLVs. So you can limit that with this.
+ * @return Return the TLV chain read
+ */
+aim_tlvlist_t *aim_tlvlist_readnum(ByteStream *bs, guint16 num)
+{
+ aim_tlvlist_t *list = NULL, *cur;
+
+ while ((byte_stream_empty(bs) > 0) && (num != 0)) {
+ guint16 type, length;
+
+ type = byte_stream_get16(bs);
+ length = byte_stream_get16(bs);
+
+ if (length > byte_stream_empty(bs)) {
+ aim_tlvlist_free(&list);
+ return NULL;
+ }
+
+ cur = g_new0(aim_tlvlist_t, 1);
+ cur->tlv = createtlv(type, length, NULL);
+ if (cur->tlv->length > 0) {
+ cur->tlv->value = byte_stream_getraw(bs, length);
+ if (!cur->tlv->value) {
+ freetlv(&cur->tlv);
+ free(cur);
+ aim_tlvlist_free(&list);
+ return NULL;
+ }
+ }
+
+ if (num > 0)
+ num--;
+ cur->next = list;
+ list = cur;
+ }
+
+ return list;
+}
+
+/**
+ * Read a TLV chain from a buffer.
+ *
+ * Reads and parses a series of TLV patterns from a data buffer; the
+ * returned structure is manipulatable with the rest of the TLV
+ * routines. When done with a TLV chain, aim_tlvlist_free() should
+ * be called to free the dynamic substructures.
+ *
+ * XXX There should be a flag setable here to have the tlvlist contain
+ * bstream references, so that at least the ->value portion of each
+ * element doesn't need to be malloc/memcpy'd. This could prove to be
+ * just as efficient as the in-place TLV parsing used in a couple places
+ * in libfaim.
+ *
+ * @param bs Input bstream
+ * @param len The max length in bytes that will be read.
+ * There are a number of places where you want to read in a tlvchain,
+ * but the chain is not at the end of the SNAC, and the chain is
+ * preceded by the length of the TLVs. So you can limit that with this.
+ * @return Return the TLV chain read
+ */
+aim_tlvlist_t *aim_tlvlist_readlen(ByteStream *bs, guint16 len)
+{
+ aim_tlvlist_t *list = NULL, *cur;
+
+ while ((byte_stream_empty(bs) > 0) && (len > 0)) {
+ guint16 type, length;
+
+ type = byte_stream_get16(bs);
+ length = byte_stream_get16(bs);
+
+ if (length > byte_stream_empty(bs)) {
+ aim_tlvlist_free(&list);
+ return NULL;
+ }
+
+ cur = g_new0(aim_tlvlist_t, 1);
+ cur->tlv = createtlv(type, length, NULL);
+ if (cur->tlv->length > 0) {
+ cur->tlv->value = byte_stream_getraw(bs, length);
+ if (!cur->tlv->value) {
+ freetlv(&cur->tlv);
+ free(cur);
+ aim_tlvlist_free(&list);
+ return NULL;
+ }
+ }
+
+ len -= aim_tlvlist_size(&cur);
+ cur->next = list;
+ list = cur;
+ }
+
+ return list;
+}
+
+/**
+ * Duplicate a TLV chain.
+ * This is pretty self explanatory.
+ *
+ * @param orig The TLV chain you want to make a copy of.
+ * @return A newly allocated TLV chain.
+ */
+aim_tlvlist_t *aim_tlvlist_copy(aim_tlvlist_t *orig)
+{
+ aim_tlvlist_t *new = NULL;
+
+ while (orig) {
+ aim_tlvlist_add_raw(&new, orig->tlv->type, orig->tlv->length, orig->tlv->value);
+ orig = orig->next;
+ }
+
+ return new;
+}
+
+/*
+ * Compare two TLV lists for equality. This probably is not the most
+ * efficient way to do this.
+ *
+ * @param one One of the TLV chains to compare.
+ * @param two The other TLV chain to compare.
+ * @return Return 0 if the lists are the same, return 1 if they are different.
+ */
+int aim_tlvlist_cmp(aim_tlvlist_t *one, aim_tlvlist_t *two)
+{
+ ByteStream bs1, bs2;
+
+ if (aim_tlvlist_size(&one) != aim_tlvlist_size(&two))
+ return 1;
+
+ byte_stream_new(&bs1, aim_tlvlist_size(&one));
+ byte_stream_new(&bs2, aim_tlvlist_size(&two));
+
+ aim_tlvlist_write(&bs1, &one);
+ aim_tlvlist_write(&bs2, &two);
+
+ if (memcmp(bs1.data, bs2.data, bs1.len)) {
+ free(bs1.data);
+ free(bs2.data);
+ return 1;
+ }
+
+ g_free(bs1.data);
+ g_free(bs2.data);
+
+ return 0;
+}
+
+/**
+ * Free a TLV chain structure
+ *
+ * Walks the list of TLVs in the passed TLV chain and
+ * frees each one. Note that any references to this data
+ * should be removed before calling this.
+ *
+ * @param list Chain to be freed
+ */
+void aim_tlvlist_free(aim_tlvlist_t **list)
+{
+ aim_tlvlist_t *cur;
+
+ if (!list || !*list)
+ return;
+
+ for (cur = *list; cur; ) {
+ aim_tlvlist_t *tmp;
+
+ freetlv(&cur->tlv);
+
+ tmp = cur->next;
+ free(cur);
+ cur = tmp;
+ }
+
+ list = NULL;
+
+ return;
+}
+
+/**
+ * Count the number of TLVs in a chain.
+ *
+ * @param list Chain to be counted.
+ * @return The number of TLVs stored in the passed chain.
+ */
+int aim_tlvlist_count(aim_tlvlist_t **list)
+{
+ aim_tlvlist_t *cur;
+ int count;
+
+ if (!list || !*list)
+ return 0;
+
+ for (cur = *list, count = 0; cur; cur = cur->next)
+ count++;
+
+ return count;
+}
+
+/**
+ * Count the number of bytes in a TLV chain.
+ *
+ * @param list Chain to be sized
+ * @return The number of bytes that would be needed to
+ * write the passed TLV chain to a data buffer.
+ */
+int aim_tlvlist_size(aim_tlvlist_t **list)
+{
+ aim_tlvlist_t *cur;
+ int size;
+
+ if (!list || !*list)
+ return 0;
+
+ for (cur = *list, size = 0; cur; cur = cur->next)
+ size += (4 + cur->tlv->length);
+
+ return size;
+}
+
+/**
+ * Adds the passed string as a TLV element of the passed type
+ * to the TLV chain.
+ *
+ * @param list Desination chain (%NULL pointer if empty).
+ * @param type TLV type.
+ * @param length Length of string to add (not including %NULL).
+ * @param value String to add.
+ * @return The size of the value added.
+ */
+int aim_tlvlist_add_raw(aim_tlvlist_t **list, const guint16 type, const guint16 length, const guint8 *value)
+{
+ aim_tlvlist_t *newtlv, *cur;
+
+ if (list == NULL)
+ return 0;
+
+ newtlv = g_new0(aim_tlvlist_t, 1);
+ newtlv->tlv = createtlv(type, length, NULL);
+ if (newtlv->tlv->length > 0)
+ newtlv->tlv->value = g_memdup(value, length);
+
+ if (!*list)
+ *list = newtlv;
+ else {
+ for(cur = *list; cur->next; cur = cur->next)
+ ;
+ cur->next = newtlv;
+ }
+
+ return newtlv->tlv->length;
+}
+
+/**
+ * Add a one byte integer to a TLV chain.
+ *
+ * @param list Destination chain.
+ * @param type TLV type to add.
+ * @param value Value to add.
+ * @return The size of the value added.
+ */
+int aim_tlvlist_add_8(aim_tlvlist_t **list, const guint16 type, const guint8 value)
+{
+ guint8 v8[1];
+
+ aimutil_put8(v8, value);
+
+ return aim_tlvlist_add_raw(list, type, 1, v8);
+}
+
+/**
+ * Add a two byte integer to a TLV chain.
+ *
+ * @param list Destination chain.
+ * @param type TLV type to add.
+ * @param value Value to add.
+ * @return The size of the value added.
+ */
+int aim_tlvlist_add_16(aim_tlvlist_t **list, const guint16 type, const guint16 value)
+{
+ guint8 v16[2];
+
+ aimutil_put16(v16, value);
+
+ return aim_tlvlist_add_raw(list, type, 2, v16);
+}
+
+/**
+ * Add a four byte integer to a TLV chain.
+ *
+ * @param list Destination chain.
+ * @param type TLV type to add.
+ * @param value Value to add.
+ * @return The size of the value added.
+ */
+int aim_tlvlist_add_32(aim_tlvlist_t **list, const guint16 type, const guint32 value)
+{
+ guint8 v32[4];
+
+ aimutil_put32(v32, value);
+
+ return aim_tlvlist_add_raw(list, type, 4, v32);
+}
+
+/**
+ * Add a string to a TLV chain.
+ *
+ * @param list Destination chain.
+ * @param type TLV type to add.
+ * @param value Value to add.
+ * @return The size of the value added.
+ */
+int aim_tlvlist_add_str(aim_tlvlist_t **list, const guint16 type, const char *value)
+{
+ return aim_tlvlist_add_raw(list, type, strlen(value), (guint8 *)value);
+}
+
+/**
+ * Adds a block of capability blocks to a TLV chain. The bitfield
+ * passed in should be a bitwise %OR of any of the %AIM_CAPS constants:
+ *
+ * %OSCAR_CAPABILITY_BUDDYICON Supports Buddy Icons
+ * %OSCAR_CAPABILITY_TALK Supports Voice Chat
+ * %OSCAR_CAPABILITY_IMIMAGE Supports DirectIM/IMImage
+ * %OSCAR_CAPABILITY_CHAT Supports Chat
+ * %OSCAR_CAPABILITY_GETFILE Supports Get File functions
+ * %OSCAR_CAPABILITY_SENDFILE Supports Send File functions
+ *
+ * @param list Destination chain
+ * @param type TLV type to add
+ * @param caps Bitfield of capability flags to send
+ * @return The size of the value added.
+ */
+int aim_tlvlist_add_caps(aim_tlvlist_t **list, const guint16 type, const guint32 caps)
+{
+ guint8 buf[16*16]; /* XXX icky fixed length buffer */
+ ByteStream bs;
+
+ if (!caps)
+ return 0; /* nothing there anyway */
+
+ byte_stream_init(&bs, buf, sizeof(buf));
+
+ byte_stream_putcaps(&bs, caps);
+
+ return aim_tlvlist_add_raw(list, type, byte_stream_curpos(&bs), buf);
+}
+
+/**
+ * Adds the given userinfo struct to a TLV chain.
+ *
+ * @param list Destination chain.
+ * @param type TLV type to add.
+ * @return The size of the value added.
+ */
+int aim_tlvlist_add_userinfo(aim_tlvlist_t **list, guint16 type, aim_userinfo_t *userinfo)
+{
+ guint8 buf[1024]; /* bleh */
+ ByteStream bs;
+
+ byte_stream_init(&bs, buf, sizeof(buf));
+
+ aim_putuserinfo(&bs, userinfo);
+
+ return aim_tlvlist_add_raw(list, type, byte_stream_curpos(&bs), buf);
+}
+
+/**
+ * Adds the given chatroom info to a TLV chain.
+ *
+ * @param list Destination chain.
+ * @param type TLV type to add.
+ * @param roomname The name of the chat.
+ * @param instance The instance.
+ * @return The size of the value added.
+ */
+int aim_tlvlist_add_chatroom(aim_tlvlist_t **list, guint16 type, guint16 exchange, const char *roomname, guint16 instance)
+{
+ int len;
+ ByteStream bs;
+
+ byte_stream_new(&bs, 2 + 1 + strlen(roomname) + 2);
+
+ byte_stream_put16(&bs, exchange);
+ byte_stream_put8(&bs, strlen(roomname));
+ byte_stream_putstr(&bs, roomname);
+ byte_stream_put16(&bs, instance);
+
+ len = aim_tlvlist_add_raw(list, type, byte_stream_curpos(&bs), bs.data);
+
+ g_free(bs.data);
+
+ return len;
+}
+
+/**
+ * Adds a TLV with a zero length to a TLV chain.
+ *
+ * @param list Destination chain.
+ * @param type TLV type to add.
+ * @return The size of the value added.
+ */
+int aim_tlvlist_add_noval(aim_tlvlist_t **list, const guint16 type)
+{
+ return aim_tlvlist_add_raw(list, type, 0, NULL);
+}
+
+/*
+ * Note that the inner TLV chain will not be modifiable as a tlvchain once
+ * it is written using this. Or rather, it can be, but updates won't be
+ * made to this.
+ *
+ * XXX should probably support sublists for real.
+ *
+ * This is so neat.
+ *
+ * @param list Destination chain.
+ * @param type TLV type to add.
+ * @param t1 The TLV chain you want to write.
+ * @return The number of bytes written to the destination TLV chain.
+ * 0 is returned if there was an error or if the destination
+ * TLV chain has length 0.
+ */
+int aim_tlvlist_add_frozentlvlist(aim_tlvlist_t **list, guint16 type, aim_tlvlist_t **tl)
+{
+ int buflen;
+ ByteStream bs;
+
+ buflen = aim_tlvlist_size(tl);
+
+ if (buflen <= 0)
+ return 0;
+
+ byte_stream_new(&bs, buflen);
+
+ aim_tlvlist_write(&bs, tl);
+
+ aim_tlvlist_add_raw(list, type, byte_stream_curpos(&bs), bs.data);
+
+ g_free(bs.data);
+
+ return buflen;
+}
+
+/**
+ * Substitute a TLV of a given type with a new TLV of the same type. If
+ * you attempt to replace a TLV that does not exist, this function will
+ * just add a new TLV as if you called aim_tlvlist_add_raw().
+ *
+ * @param list Desination chain (%NULL pointer if empty).
+ * @param type TLV type.
+ * @param length Length of string to add (not including %NULL).
+ * @param value String to add.
+ * @return The length of the TLV.
+ */
+int aim_tlvlist_replace_raw(aim_tlvlist_t **list, const guint16 type, const guint16 length, const guint8 *value)
+{
+ aim_tlvlist_t *cur;
+
+ if (list == NULL)
+ return 0;
+
+ for (cur = *list; ((cur != NULL) && (cur->tlv->type != type)); cur = cur->next);
+ if (cur == NULL)
+ return aim_tlvlist_add_raw(list, type, length, value);
+
+ free(cur->tlv->value);
+ cur->tlv->length = length;
+ if (cur->tlv->length > 0) {
+ cur->tlv->value = g_memdup(value, length);
+ } else
+ cur->tlv->value = NULL;
+
+ return cur->tlv->length;
+}
+
+/**
+ * Substitute a TLV of a given type with a new TLV of the same type. If
+ * you attempt to replace a TLV that does not exist, this function will
+ * just add a new TLV as if you called aim_tlvlist_add_str().
+ *
+ * @param list Desination chain (%NULL pointer if empty).
+ * @param type TLV type.
+ * @param str String to add.
+ * @return The length of the TLV.
+ */
+int aim_tlvlist_replace_str(aim_tlvlist_t **list, const guint16 type, const char *str)
+{
+ return aim_tlvlist_replace_raw(list, type, strlen(str), (const guchar *)str);
+}
+
+/**
+ * Substitute a TLV of a given type with a new TLV of the same type. If
+ * you attempt to replace a TLV that does not exist, this function will
+ * just add a new TLV as if you called aim_tlvlist_add_raw().
+ *
+ * @param list Desination chain (%NULL pointer if empty).
+ * @param type TLV type.
+ * @return The length of the TLV.
+ */
+int aim_tlvlist_replace_noval(aim_tlvlist_t **list, const guint16 type)
+{
+ return aim_tlvlist_replace_raw(list, type, 0, NULL);
+}
+
+/**
+ * Substitute a TLV of a given type with a new TLV of the same type. If
+ * you attempt to replace a TLV that does not exist, this function will
+ * just add a new TLV as if you called aim_tlvlist_add_raw().
+ *
+ * @param list Desination chain (%NULL pointer if empty).
+ * @param type TLV type.
+ * @param value 8 bit value to add.
+ * @return The length of the TLV.
+ */
+int aim_tlvlist_replace_8(aim_tlvlist_t **list, const guint16 type, const guint8 value)
+{
+ guint8 v8[1];
+
+ aimutil_put8(v8, value);
+
+ return aim_tlvlist_replace_raw(list, type, 1, v8);
+}
+
+/**
+ * Substitute a TLV of a given type with a new TLV of the same type. If
+ * you attempt to replace a TLV that does not exist, this function will
+ * just add a new TLV as if you called aim_tlvlist_add_raw().
+ *
+ * @param list Desination chain (%NULL pointer if empty).
+ * @param type TLV type.
+ * @param value 32 bit value to add.
+ * @return The length of the TLV.
+ */
+int aim_tlvlist_replace_32(aim_tlvlist_t **list, const guint16 type, const guint32 value)
+{
+ guint8 v32[4];
+
+ aimutil_put32(v32, value);
+
+ return aim_tlvlist_replace_raw(list, type, 4, v32);
+}
+
+/**
+ * Remove a TLV of a given type. If you attempt to remove a TLV that
+ * does not exist, nothing happens.
+ *
+ * @param list Desination chain (%NULL pointer if empty).
+ * @param type TLV type.
+ */
+void aim_tlvlist_remove(aim_tlvlist_t **list, const guint16 type)
+{
+ aim_tlvlist_t *del;
+
+ if (!list || !(*list))
+ return;
+
+ /* Remove the item from the list */
+ if ((*list)->tlv->type == type) {
+ del = *list;
+ *list = (*list)->next;
+ } else {
+ aim_tlvlist_t *cur;
+ for (cur=*list; (cur->next && (cur->next->tlv->type!=type)); cur=cur->next);
+ if (!cur->next)
+ return;
+ del = cur->next;
+ cur->next = del->next;
+ }
+
+ /* Free the removed item */
+ free(del->tlv->value);
+ free(del->tlv);
+ free(del);
+}
+
+/**
+ * Write a TLV chain into a data buffer.
+ *
+ * Copies a TLV chain into a raw data buffer, writing only the number
+ * of bytes specified. This operation does not free the chain;
+ * aim_tlvlist_free() must still be called to free up the memory used
+ * by the chain structures.
+ *
+ * XXX clean this up, make better use of bstreams
+ *
+ * @param bs Input bstream
+ * @param list Source TLV chain
+ * @return Return 0 if the destination bstream is too small.
+ */
+int aim_tlvlist_write(ByteStream *bs, aim_tlvlist_t **list)
+{
+ int goodbuflen;
+ aim_tlvlist_t *cur;
+
+ /* do an initial run to test total length */
+ goodbuflen = aim_tlvlist_size(list);
+
+ if (goodbuflen > byte_stream_empty(bs))
+ return 0; /* not enough buffer */
+
+ /* do the real write-out */
+ for (cur = *list; cur; cur = cur->next) {
+ byte_stream_put16(bs, cur->tlv->type);
+ byte_stream_put16(bs, cur->tlv->length);
+ if (cur->tlv->length)
+ byte_stream_putraw(bs, cur->tlv->value, cur->tlv->length);
+ }
+
+ return 1; /* XXX this is a nonsensical return */
+}
+
+
+/**
+ * Grab the Nth TLV of type type in the TLV list list.
+ *
+ * Returns a pointer to an aim_tlv_t of the specified type;
+ * %NULL on error. The @nth parameter is specified starting at %1.
+ * In most cases, there will be no more than one TLV of any type
+ * in a chain.
+ *
+ * @param list Source chain.
+ * @param type Requested TLV type.
+ * @param nth Index of TLV of type to get.
+ * @return The TLV you were looking for, or NULL if one could not be found.
+ */
+aim_tlv_t *aim_tlv_gettlv(aim_tlvlist_t *list, const guint16 type, const int nth)
+{
+ aim_tlvlist_t *cur;
+ int i;
+
+ for (cur = list, i = 0; cur; cur = cur->next) {
+ if (cur && cur->tlv) {
+ if (cur->tlv->type == type)
+ i++;
+ if (i >= nth)
+ return cur->tlv;
+ }
+ }
+
+ return NULL;
+}
+
+/**
+ * Get the length of the data of the nth TLV in the given TLV chain.
+ *
+ * @param list Source chain.
+ * @param type Requested TLV type.
+ * @param nth Index of TLV of type to get.
+ * @return The length of the data in this TLV, or -1 if the TLV could not be
+ * found. Unless -1 is returned, this value will be 2 bytes.
+ */
+int aim_tlv_getlength(aim_tlvlist_t *list, const guint16 type, const int nth)
+{
+ aim_tlvlist_t *cur;
+ int i;
+
+ for (cur = list, i = 0; cur; cur = cur->next) {
+ if (cur && cur->tlv) {
+ if (cur->tlv->type == type)
+ i++;
+ if (i >= nth)
+ return cur->tlv->length;
+ }
+ }
+
+ return -1;
+}
+
+char *
+aim_tlv_getvalue_as_string(aim_tlv_t *tlv)
+{
+ char *ret;
+
+ ret = malloc(tlv->length + 1);
+ memcpy(ret, tlv->value, tlv->length);
+ ret[tlv->length] = '\0';
+
+ return ret;
+}
+
+/**
+ * Retrieve the data from the nth TLV in the given TLV chain as a string.
+ *
+ * @param list Source TLV chain.
+ * @param type TLV type to search for.
+ * @param nth Index of TLV to return.
+ * @return The value of the TLV you were looking for, or NULL if one could
+ * not be found. This is a dynamic buffer and must be freed by the
+ * caller.
+ */
+char *aim_tlv_getstr(aim_tlvlist_t *list, const guint16 type, const int nth)
+{
+ aim_tlv_t *tlv;
+
+ if (!(tlv = aim_tlv_gettlv(list, type, nth)))
+ return NULL;
+
+ return aim_tlv_getvalue_as_string(tlv);
+}
+
+/**
+ * Retrieve the data from the nth TLV in the given TLV chain as an 8bit
+ * integer.
+ *
+ * @param list Source TLV chain.
+ * @param type TLV type to search for.
+ * @param nth Index of TLV to return.
+ * @return The value the TLV you were looking for, or 0 if one could
+ * not be found.
+ */
+guint8 aim_tlv_get8(aim_tlvlist_t *list, const guint16 type, const int nth)
+{
+ aim_tlv_t *tlv;
+
+ if (!(tlv = aim_tlv_gettlv(list, type, nth)))
+ return 0; /* erm */
+ return aimutil_get8(tlv->value);
+}
+
+/**
+ * Retrieve the data from the nth TLV in the given TLV chain as a 16bit
+ * integer.
+ *
+ * @param list Source TLV chain.
+ * @param type TLV type to search for.
+ * @param nth Index of TLV to return.
+ * @return The value the TLV you were looking for, or 0 if one could
+ * not be found.
+ */
+guint16 aim_tlv_get16(aim_tlvlist_t *list, const guint16 type, const int nth)
+{
+ aim_tlv_t *tlv;
+
+ if (!(tlv = aim_tlv_gettlv(list, type, nth)))
+ return 0; /* erm */
+ return aimutil_get16(tlv->value);
+}
+
+/**
+ * Retrieve the data from the nth TLV in the given TLV chain as a 32bit
+ * integer.
+ *
+ * @param list Source TLV chain.
+ * @param type TLV type to search for.
+ * @param nth Index of TLV to return.
+ * @return The value the TLV you were looking for, or 0 if one could
+ * not be found.
+ */
+guint32 aim_tlv_get32(aim_tlvlist_t *list, const guint16 type, const int nth)
+{
+ aim_tlv_t *tlv;
+
+ if (!(tlv = aim_tlv_gettlv(list, type, nth)))
+ return 0; /* erm */
+ return aimutil_get32(tlv->value);
+}
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