Changeset 862371b for libfaim/tlv.c

Timestamp:

Jun 29, 2003, 1:47:04 PM (20 years ago)

Author:

James M. Kretchmar <kretch@mit.edu>

Branches:

master, barnowl_perlaim, debian, owl, release-1.4, release-1.5, release-1.6, release-1.7, release-1.8, release-1.9

Children:

e016fc2

Parents:

03ad7b2

Message:

*** empty log message ***

File:

• libfaim/tlv.c (modified) (8 diffs)

libfaim/tlv.c

@@ -29 +29 @@
 /**
  * aim_readtlvchain - Read a TLV chain from a buffer.
- * @buf: Input buffer
- * @maxlen: Length of input buffer
+ * @param bs Input bstream
  *
  * Reads and parses a series of TLV patterns from a data buffer; the
@@ -47 +46 @@
 {
         aim_tlvlist_t *list = NULL, *cur;
-
+        
         while (aim_bstream_empty(bs) > 0) {
                 fu16_t type, length;
@@ -71 +70 @@
                 else {
 
-                        if (length > aim_bstream_empty(bs))
-                                goto errout;
+                        if (length > aim_bstream_empty(bs)) {
+                                aim_freetlvchain(&list);
+                                return NULL;
+                        }
 
                         cur = (aim_tlvlist_t *)malloc(sizeof(aim_tlvlist_t));
-                        if (!cur)
-                                goto errout;
+                        if (!cur) {
+                                aim_freetlvchain(&list);
+                                return NULL;
+                        }
 
                         memset(cur, 0, sizeof(aim_tlvlist_t));
 
-                        cur->tlv = createtlv(); 
+                        cur->tlv = createtlv();
                         if (!cur->tlv) {
                                 free(cur);
-                                goto errout;
+                                aim_freetlvchain(&list);
+                                return NULL;
                         }
                         cur->tlv->type = type;
@@ -91 +95 @@
                                        freetlv(&cur->tlv);
                                        free(cur);
-                                       goto errout;
+                                       aim_freetlvchain(&list);
+                                       return NULL;
                                }
                         }
@@ -101 +106 @@
 
         return list;
-
-errout:
-        aim_freetlvchain(&list);
-        return NULL;
+}
+
+/**
+ * aim_readtlvchain_num - Read a TLV chain from a buffer.
+ * @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 
+ *        preceeded by the number of TLVs.  So you can limit that.
+ *
+ * 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_freetlvchain() 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 effecient as the in-place TLV parsing used in a couple places
+ * in libfaim.
+ *
+ */
+faim_internal aim_tlvlist_t *aim_readtlvchain_num(aim_bstream_t *bs, fu16_t num)
+{
+        aim_tlvlist_t *list = NULL, *cur;
+        
+        while ((aim_bstream_empty(bs) > 0) && (num != 0)) {
+                fu16_t type, length;
+
+                type = aimbs_get16(bs);
+                length = aimbs_get16(bs);
+
+                if (length > aim_bstream_empty(bs)) {
+                        aim_freetlvchain(&list);
+                        return NULL;
+                }
+
+                cur = (aim_tlvlist_t *)malloc(sizeof(aim_tlvlist_t));
+                if (!cur) {
+                        aim_freetlvchain(&list);
+                        return NULL;
+                }
+
+                memset(cur, 0, sizeof(aim_tlvlist_t));
+
+                cur->tlv = createtlv();
+                if (!cur->tlv) {
+                        free(cur);
+                        aim_freetlvchain(&list);
+                        return NULL;
+                }
+                cur->tlv->type = type;
+                if ((cur->tlv->length = length)) {
+                       cur->tlv->value = aimbs_getraw(bs, length);      
+                       if (!cur->tlv->value) {
+                               freetlv(&cur->tlv);
+                               free(cur);
+                               aim_freetlvchain(&list);
+                               return NULL;
+                       }
+                }
+
+                num--;
+                cur->next = list;
+                list = cur;
+        }
+
+        return list;
 }
 
@@ -182 +251 @@
 
 /**
- * aim_addtlvtochain_str - Add a string to a TLV chain
+ * aim_addtlvtochain_raw - Add a string to a TLV chain
  * @list: Desination chain (%NULL pointer if empty)
- * @type: TLV type
- * @str: String to add
- * @len: Length of string to add (not including %NULL)
+ * @t: TLV type
+ * @l: Length of string to add (not including %NULL)
+ * @v: String to add
  *
  * Adds the passed string as a TLV element of the passed type
@@ -245 +314 @@
  * aim_addtlvtochain16 - Add a 16bit integer to a TLV chain
  * @list: Destination chain
- * @type: TLV type to add
- * @val: Value to add
+ * @t: TLV type to add
+ * @v: Value to add
  *
  * Adds a two-byte unsigned integer to a TLV chain.
@@ -607 +676 @@
 }
 #endif
-