#ifdef SLAPD_BDB
-/* Flatten an Entry into a buffer. The buffer contents become a direct
- * copy of the entry, with all pointers converted to offsets from the
- * beginning of the buffer. We do this by first walking through all
- * the fields of the Entry, adding up their sizes. Then a single chunk
- * of memory is malloc'd and the entry is copied. We differentiate between
- * fixed size fields and variable-length content when tallying up the
- * entry size, so that we can stick all of the variable-length stuff
- * into the back half of the buffer.
+/* This is like a ber_len */
+static ber_len_t
+entry_lenlen(ber_len_t len)
+{
+ if (len <= 0x7f)
+ return 1;
+ if (len <= 0xff)
+ return 2;
+ if (len <= 0xffff)
+ return 3;
+ if (len <= 0xffffff)
+ return 4;
+ return 5;
+}
+
+static void
+entry_putlen(unsigned char **buf, ber_len_t len)
+{
+ ber_len_t lenlen = entry_lenlen(len);
+
+ if (lenlen == 1) {
+ **buf = (unsigned char) len;
+ } else {
+ int i;
+ **buf = 0x80 | (lenlen - 1);
+ for (i=lenlen-1; i>0; i--) {
+ (*buf)[i] = (unsigned char) len;
+ len >>= 8;
+ }
+ }
+ *buf += lenlen;
+}
+
+static ber_len_t
+entry_getlen(unsigned char **buf)
+{
+ ber_len_t len;
+ int i;
+
+ len = *(*buf)++;
+ if (len <= 0x7f)
+ return len;
+ i = len & 0x7f;
+ len = 0;
+ for (;i > 0; i--) {
+ len <<= 8;
+ len |= *(*buf)++;
+ }
+ return len;
+}
+
+/* Flatten an Entry into a buffer. The buffer is filled with just the
+ * strings/bervals of all the entry components. Each field is preceded
+ * by its length, encoded the way ber_put_len works. Every field is NUL
+ * terminated. The entire buffer size is precomputed so that a single
+ * malloc can be performed. The entry size is also recorded,
+ * to aid in entry_decode.
*/
-int entry_encode(Entry *e, struct berval **bv)
+int entry_encode(Entry *e, struct berval *bv)
{
int siz = sizeof(Entry);
int len, dnlen, ndnlen;
- int i, j;
- Entry *f;
- Attribute *a, *b;
- struct berval **bvl, *bz;
- char *ptr, *base, *data;
+ int i;
+ Attribute *a;
+ unsigned char *ptr;
- *bv = ch_malloc(sizeof(struct berval));
#ifdef NEW_LOGGING
LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
"entry_encode: id: 0x%08lx \"%s\"\n",
dnlen = strlen(e->e_dn);
ndnlen = strlen(e->e_ndn);
len = dnlen + ndnlen + 2; /* two trailing NUL bytes */
+ len += entry_lenlen(dnlen);
+ len += entry_lenlen(ndnlen);
for (a=e->e_attrs; a; a=a->a_next) {
/* For AttributeDesc, we only store the attr name */
siz += sizeof(Attribute);
len += a->a_desc->ad_cname.bv_len+1;
+ len += entry_lenlen(a->a_desc->ad_cname.bv_len);
for (i=0; a->a_vals[i]; i++) {
siz += sizeof(struct berval *);
siz += sizeof(struct berval);
len += a->a_vals[i]->bv_len + 1;
+ len += entry_lenlen(a->a_vals[i]->bv_len);
}
+ len += entry_lenlen(i);
siz += sizeof(struct berval *); /* NULL pointer at end */
}
- (*bv)->bv_len = siz + len;
- (*bv)->bv_val = ch_malloc(siz+len);
- base = (*bv)->bv_val;
- ptr = base + siz;
- f = (Entry *)base;
- data = (char *)(f+1);
- f->e_id = e->e_id;
- f->e_dn = (char *)(ptr-base);
+ len += 1; /* NUL byte at end */
+ len += entry_lenlen(siz);
+ bv->bv_len = len;
+ bv->bv_val = ch_malloc(len);
+ ptr = (unsigned char *)bv->bv_val;
+ entry_putlen(&ptr, siz);
+ entry_putlen(&ptr, dnlen);
memcpy(ptr, e->e_dn, dnlen);
ptr += dnlen;
*ptr++ = '\0';
- f->e_ndn = (char *)(ptr-base);
+ entry_putlen(&ptr, ndnlen);
memcpy(ptr, e->e_ndn, ndnlen);
ptr += ndnlen;
*ptr++ = '\0';
- f->e_attrs = e->e_attrs ? (Attribute *)sizeof(Entry) : NULL;
- f->e_private = NULL;
+
for (a=e->e_attrs; a; a=a->a_next) {
- b = (Attribute *)data;
- data = (char *)(b+1);
- b->a_desc = (AttributeDescription *)(ptr-base);
+ entry_putlen(&ptr, a->a_desc->ad_cname.bv_len);
memcpy(ptr, a->a_desc->ad_cname.bv_val,
a->a_desc->ad_cname.bv_len);
ptr += a->a_desc->ad_cname.bv_len;
*ptr++ = '\0';
if (a->a_vals) {
- bvl = (struct berval **)data;
- b->a_vals = (struct berval **)(data-base);
for (i=0; a->a_vals[i]; i++);
- data = (char *)(bvl+i+1);
- bz = (struct berval *)data;
- for (j=0; j<i; j++) {
- bz->bv_len = a->a_vals[j]->bv_len;
- if (a->a_vals[j]->bv_val) {
- bz->bv_val = (char *)(ptr-base);
- memcpy(ptr, a->a_vals[j]->bv_val, bz->bv_len);
- } else {
- bz->bv_val = NULL;
- }
- ptr += bz->bv_len;
- *ptr++ = '\0';
- bvl[j] = (struct berval *)(data-base);
- bz++;
- data = (char *)bz;
+ entry_putlen(&ptr, i);
+ for (i=0; a->a_vals[i]; i++) {
+ entry_putlen(&ptr, a->a_vals[i]->bv_len);
+ memcpy(ptr, a->a_vals[i]->bv_val,
+ a->a_vals[i]->bv_len);
+ ptr += a->a_vals[i]->bv_len;
+ *ptr++ = '\0';
}
- bvl[j] = NULL;
- } else {
- b->a_vals = NULL;
}
-
- if (a->a_next)
- b->a_next = (Attribute *)(data-base);
- else
- b->a_next = NULL;
}
+ *ptr = '\0';
return 0;
}
/* Retrieve an Entry that was stored using entry_encode above.
- * All we have to do is add the buffer address to all of the
- * stored offsets. We also must lookup the stored attribute names
- * to get AttributeDescriptions. To detect if the attributes of
- * an Entry are later modified, we note that e->e_attr is always
- * a constant offset from (e).
+ * We malloc a single block with the size stored above for the Entry
+ * and all if its Attributes. We also must lookup the stored
+ * attribute names to get AttributeDescriptions. To detect if the
+ * attributes of an Entry are later modified, we note that e->e_attr
+ * is always a constant offset from (e).
*
* Note: everything is stored in a single contiguous block, so
* you can not free individual attributes or names from this
*/
int entry_decode(struct berval *bv, Entry **e)
{
- int i;
- long base;
+ int i, j;
+ int rc;
Attribute *a;
- Entry *x = (Entry *)bv->bv_val;
- char *type;
+ Entry *x;
const char *text;
AttributeDescription *ad;
-
- base = (long)bv->bv_val;
- x->e_dn += base;
- x->e_ndn += base;
+ unsigned char *ptr = (unsigned char *)bv->bv_val;
+ struct berval **bptr;
+ struct berval *vptr;
+
+ i = entry_getlen(&ptr);
+ x = ch_malloc(i);
+ i = entry_getlen(&ptr);
+ x->e_dn = ptr;
+ ptr += i+1;
+ i = entry_getlen(&ptr);
+ x->e_ndn = ptr;
+ ptr += i+1;
#ifdef NEW_LOGGING
LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL2,
"entry_decode: \"%s\"\n", x->e_dn ));
"entry_decode: \"%s\"\n",
x->e_dn, 0, 0 );
#endif
- x->e_private = NULL;
- if (x->e_attrs)
- x->e_attrs = (Attribute *)((long)x->e_attrs+base);
- for (a=x->e_attrs; a; a=a->a_next) {
- if (a->a_next)
- a->a_next = (Attribute *)((long)a->a_next+base);
+ x->e_private = bv->bv_val;
+
+ /* A valid entry must have at least one attr, so this
+ * pointer can never be NULL
+ */
+ x->e_attrs = (Attribute *)(x+1);
+ bptr = (struct berval **)x->e_attrs;
+ a = NULL;
+
+ while (i = entry_getlen(&ptr)) {
+ if (a) {
+ a->a_next = (Attribute *)bptr;
+ }
+ a = (Attribute *)bptr;
ad = NULL;
- type = (char *)a->a_desc+base;
- i = slap_str2ad( type, &ad, &text );
+ rc = slap_str2ad( ptr, &ad, &text );
- if( i != LDAP_SUCCESS ) {
+ if( rc != LDAP_SUCCESS ) {
#ifdef NEW_LOGGING
LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
- "entry_decode: str2ad(%s): %s\n", type, text ));
+ "entry_decode: str2ad(%s): %s\n", ptr, text ));
#else
Debug( LDAP_DEBUG_TRACE,
- "<= entry_decode: str2ad(%s): %s\n", type, text, 0 );
+ "<= entry_decode: str2ad(%s): %s\n", ptr, text, 0 );
#endif
- i = slap_str2undef_ad( type, &ad, &text );
+ rc = slap_str2undef_ad( ptr, &ad, &text );
- if( i != LDAP_SUCCESS ) {
+ if( rc != LDAP_SUCCESS ) {
#ifdef NEW_LOGGING
LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
- "entry_decode: str2undef_ad(%s): %s\n", type, text));
+ "entry_decode: str2undef_ad(%s): %s\n", ptr, text));
#else
Debug( LDAP_DEBUG_ANY,
"<= entry_decode: str2undef_ad(%s): %s\n",
- type, text, 0 );
+ ptr, text, 0 );
#endif
- return i;
+ return rc;
}
}
+ ptr += i + 1;
a->a_desc = ad;
- if (a->a_vals) {
- a->a_vals = (struct berval **)((long)a->a_vals+base);
- for (i=0; a->a_vals[i]; i++) {
- a->a_vals[i] = (struct berval *)
- ((long)a->a_vals[i]+base);
- if (a->a_vals[i]->bv_val)
- a->a_vals[i]->bv_val += base;
- }
+ bptr = (struct berval **)(a+1);
+ a->a_vals = bptr;
+ j = entry_getlen(&ptr);
+ a->a_vals[j] = NULL;
+ vptr = (struct berval *)(bptr + j + 1);
+
+ while (j) {
+ i = entry_getlen(&ptr);
+ *bptr = vptr;
+ vptr->bv_len = i;
+ vptr->bv_val = (char *)ptr;
+ ptr += i+1;
+ bptr++;
+ vptr++;
+ j--;
}
+ bptr = (struct berval **)vptr;
}
+ if (a)
+ a->a_next = NULL;
#ifdef NEW_LOGGING
LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
"entry_decode: %s\n", x->e_dn ));
projects / openldap / commitdiff