Bugfix: encrypt VFP main loop flushes if the output stream is full.

src/vfp_encrypt.c

@@ -82,11 +82,15 @@ encrypt(struct vfp_ctx *ctx, struct ece *ece, enum vfp_status vp)
 		record_len = stream->avail_in + TAG_LEN + 1;
 	}
 	assert(record_len <= ece->rs);
-	if (record_len > stream->avail_out)
+	if (record_len > stream->avail_out) {
+		assert(vp != VFP_END);
 		return (VFP_NULL);
+	}
 	plaintext_len = record_len - (TAG_LEN + 1);
-	if (plaintext_len > stream->avail_in)
+	if (plaintext_len > stream->avail_in) {
+		assert(vp != VFP_END);
 		return (VFP_NULL);
+	}
 
 	nonce_xor_seq(crypto, nonce);
 	ciphertext_len = encrypt_record(ece->ectx, stream->next_in,
@@ -238,6 +242,8 @@ vfp_encrypt_pull(struct vfp_ctx *ctx, struct vfp_entry *ent, void *ptr,
 	}
 
 	while (vp == VFP_OK) {
+		if (isOutputBufFull(stream))
+			break;
 		if (isInputBufEmpty(stream)) {
 			size_t len = ece->chunksz;