Add infrastructure for better extension handling.
Rather than four massive functions that handle every extension,
organise the code by extension with four smaller functions for each.
Change-Id: I876b31dacb05aca9884ed3ae7c48462e6ffe3b49
Reviewed-on: https://boringssl-review.googlesource.com/5142
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/include/openssl/bytestring.h b/include/openssl/bytestring.h
index b30ae5c..8583c4e 100644
--- a/include/openssl/bytestring.h
+++ b/include/openssl/bytestring.h
@@ -278,6 +278,11 @@
* on error. */
OPENSSL_EXPORT int CBB_flush(CBB *cbb);
+/* CBB_len returns the number of bytes remaining in a fixed CBB. It is a fatal
+ * error to call this on a non-fixed CBB or one with any active children. This
+ * does not flush |cbb|. */
+OPENSSL_EXPORT size_t CBB_len(const CBB *cbb);
+
/* CBB_add_u8_length_prefixed sets |*out_contents| to a new child of |cbb|. The
* data written to |*out_contents| will be prefixed in |cbb| with an 8-bit
* length. It returns one on success or zero on error. */
