#define DEFAULT_BUF_SIZE 256
int WPACKET_allocate_bytes(WPACKET *pkt, size_t len, unsigned char **allocbytes)
+{
+ if (!WPACKET_reserve_bytes(pkt, len, allocbytes))
+ return 0;
+
+ pkt->written += len;
+ pkt->curr += len;
+ return 1;
+}
+
+int WPACKET_sub_allocate_bytes__(WPACKET *pkt, size_t len,
+ unsigned char **allocbytes, size_t lenbytes)
+{
+ if (!WPACKET_start_sub_packet_len__(pkt, lenbytes)
+ || !WPACKET_allocate_bytes(pkt, len, allocbytes)
+ || !WPACKET_close(pkt))
+ return 0;
+
+ return 1;
+}
+
+#define GETBUF(p) (((p)->staticbuf != NULL) \
+ ? (p)->staticbuf : (unsigned char *)(p)->buf->data)
+
+int WPACKET_reserve_bytes(WPACKET *pkt, size_t len, unsigned char **allocbytes)
{
/* Internal API, so should not fail */
assert(pkt->subs != NULL && len != 0);
if (pkt->maxsize - pkt->written < len)
return 0;
- if (pkt->buf->length - pkt->written < len) {
+ if (pkt->staticbuf == NULL && (pkt->buf->length - pkt->written < len)) {
size_t newlen;
+ size_t reflen;
- if (pkt->buf->length > SIZE_MAX / 2) {
+ reflen = (len > pkt->buf->length) ? len : pkt->buf->length;
+
+ if (reflen > SIZE_MAX / 2) {
newlen = SIZE_MAX;
} else {
- newlen = (pkt->buf->length == 0) ? DEFAULT_BUF_SIZE
- : pkt->buf->length * 2;
+ newlen = reflen * 2;
+ if (newlen < DEFAULT_BUF_SIZE)
+ newlen = DEFAULT_BUF_SIZE;
}
if (BUF_MEM_grow(pkt->buf, newlen) == 0)
return 0;
}
- *allocbytes = (unsigned char *)pkt->buf->data + pkt->curr;
- pkt->written += len;
- pkt->curr += len;
+ if (allocbytes != NULL)
+ *allocbytes = WPACKET_get_curr(pkt);
return 1;
}
-int WPACKET_sub_allocate_bytes__(WPACKET *pkt, size_t len,
- unsigned char **allocbytes, size_t lenbytes)
+int WPACKET_sub_reserve_bytes__(WPACKET *pkt, size_t len,
+ unsigned char **allocbytes, size_t lenbytes)
{
- if (!WPACKET_start_sub_packet_len__(pkt, lenbytes)
- || !WPACKET_allocate_bytes(pkt, len, allocbytes)
- || !WPACKET_close(pkt))
+ if (!WPACKET_reserve_bytes(pkt, lenbytes + len, allocbytes))
return 0;
+ *allocbytes += lenbytes;
+
return 1;
}
return ((size_t)1 << (lenbytes * 8)) - 1 + lenbytes;
}
-int WPACKET_init_len(WPACKET *pkt, BUF_MEM *buf, size_t lenbytes)
+static int wpacket_intern_init_len(WPACKET *pkt, size_t lenbytes)
{
unsigned char *lenchars;
- /* Internal API, so should not fail */
- assert(buf != NULL);
- if (buf == NULL)
- return 0;
-
- pkt->buf = buf;
pkt->curr = 0;
pkt->written = 0;
- pkt->maxsize = maxmaxsize(lenbytes);
pkt->subs = OPENSSL_zalloc(sizeof(*pkt->subs));
if (pkt->subs == NULL)
pkt->subs = NULL;
return 0;
}
- pkt->subs->packet_len = lenchars - (unsigned char *)pkt->buf->data;
+ pkt->subs->packet_len = lenchars - GETBUF(pkt);
return 1;
}
+int WPACKET_init_static_len(WPACKET *pkt, unsigned char *buf, size_t len,
+ size_t lenbytes)
+{
+ size_t max = maxmaxsize(lenbytes);
+
+ /* Internal API, so should not fail */
+ assert(buf != NULL && len > 0);
+ if (buf == NULL || len == 0)
+ return 0;
+
+ pkt->staticbuf = buf;
+ pkt->buf = NULL;
+ pkt->maxsize = (max < len) ? max : len;
+
+ return wpacket_intern_init_len(pkt, lenbytes);
+}
+
+int WPACKET_init_len(WPACKET *pkt, BUF_MEM *buf, size_t lenbytes)
+{
+ /* Internal API, so should not fail */
+ assert(buf != NULL);
+ if (buf == NULL)
+ return 0;
+
+ pkt->staticbuf = NULL;
+ pkt->buf = buf;
+ pkt->maxsize = maxmaxsize(lenbytes);
+
+ return wpacket_intern_init_len(pkt, lenbytes);
+}
+
int WPACKET_init(WPACKET *pkt, BUF_MEM *buf)
{
return WPACKET_init_len(pkt, buf, 0);
/*
- * Internal helper function used by WPACKET_close() and WPACKET_finish() to
- * close a sub-packet and write out its length if necessary.
+ * Internal helper function used by WPACKET_close(), WPACKET_finish() and
+ * WPACKET_fill_lengths() to close a sub-packet and write out its length if
+ * necessary. If |doclose| is 0 then it goes through the motions of closing
+ * (i.e. it fills in all the lengths), but doesn't actually close anything.
*/
-static int wpacket_intern_close(WPACKET *pkt)
+static int wpacket_intern_close(WPACKET *pkt, WPACKET_SUB *sub, int doclose)
{
- WPACKET_SUB *sub = pkt->subs;
size_t packlen = pkt->written - sub->pwritten;
if (packlen == 0
if (packlen == 0
&& sub->flags & WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH) {
+ /* We can't handle this case. Return an error */
+ if (!doclose)
+ return 0;
+
/* Deallocate any bytes allocated for the length of the WPACKET */
if ((pkt->curr - sub->lenbytes) == sub->packet_len) {
pkt->written -= sub->lenbytes;
}
/* Write out the WPACKET length if needed */
- if (sub->lenbytes > 0
- && !put_value((unsigned char *)&pkt->buf->data[sub->packet_len],
- packlen, sub->lenbytes))
+ if (sub->lenbytes > 0
+ && !put_value(&GETBUF(pkt)[sub->packet_len], packlen,
+ sub->lenbytes))
return 0;
- pkt->subs = sub->parent;
- OPENSSL_free(sub);
+ if (doclose) {
+ pkt->subs = sub->parent;
+ OPENSSL_free(sub);
+ }
+
+ return 1;
+}
+
+int WPACKET_fill_lengths(WPACKET *pkt)
+{
+ WPACKET_SUB *sub;
+
+ assert(pkt->subs != NULL);
+ if (pkt->subs == NULL)
+ return 0;
+
+ for (sub = pkt->subs; sub != NULL; sub = sub->parent) {
+ if (!wpacket_intern_close(pkt, sub, 0))
+ return 0;
+ }
return 1;
}
if (pkt->subs == NULL || pkt->subs->parent == NULL)
return 0;
- return wpacket_intern_close(pkt);
+ return wpacket_intern_close(pkt, pkt->subs, 1);
}
int WPACKET_finish(WPACKET *pkt)
if (pkt->subs == NULL || pkt->subs->parent != NULL)
return 0;
- ret = wpacket_intern_close(pkt);
+ ret = wpacket_intern_close(pkt, pkt->subs, 1);
if (ret) {
OPENSSL_free(pkt->subs);
pkt->subs = NULL;
if (!WPACKET_allocate_bytes(pkt, lenbytes, &lenchars))
return 0;
- sub->packet_len = lenchars - (unsigned char *)pkt->buf->data;
+ /* Convert to an offset in case the underlying BUF_MEM gets realloc'd */
+ sub->packet_len = lenchars - GETBUF(pkt);
return 1;
}
return WPACKET_start_sub_packet_len__(pkt, 0);
}
-int WPACKET_put_bytes(WPACKET *pkt, unsigned int val, size_t size)
+int WPACKET_put_bytes__(WPACKET *pkt, unsigned int val, size_t size)
{
unsigned char *data;
return 1;
}
+unsigned char *WPACKET_get_curr(WPACKET *pkt)
+{
+ return GETBUF(pkt) + pkt->curr;
+}
+
void WPACKET_cleanup(WPACKET *pkt)
{
WPACKET_SUB *sub, *parent;
projects / openssl.git / blobdiff