From 1c4807a49f503f066ab7c44f80b1fee0f10c3493 Mon Sep 17 00:00:00 2001
From: Stephan Bosch <stephan.bosch@dovecot.fi>
Date: Wed, 15 May 2019 10:09:01 +0200
Subject: [PATCH] lib: base64 - Add base64_get_full_encoded_size().

---
 src/lib/base64.c | 11 +++++++++++
 src/lib/base64.h |  4 ++++
 2 files changed, 15 insertions(+)

diff --git a/src/lib/base64.c b/src/lib/base64.c
index 980aa12005..96ecde5cc4 100644
--- a/src/lib/base64.c
+++ b/src/lib/base64.c
@@ -8,6 +8,17 @@
  * Low-level Base64 encoder
  */
 
+off_t base64_get_full_encoded_size(struct base64_encoder *enc ATTR_UNUSED,
+				   off_t src_size)
+{
+	off_t out_size;
+
+	/* calculate size of encoded data */
+	out_size = MAX_BASE64_ENCODED_SIZE(src_size);
+
+	return out_size;
+}
+
 static size_t
 base64_encode_get_out_size(struct base64_encoder *enc, size_t src_size)
 {
diff --git a/src/lib/base64.h b/src/lib/base64.h
index cfb7807095..03f699e4c9 100644
--- a/src/lib/base64.h
+++ b/src/lib/base64.h
@@ -61,6 +61,10 @@ base64_encode_reset(struct base64_encoder *enc)
 	base64_encode_init(enc, b64);
 }
 
+/* Translate the size of the full encoder input to the size of the encoder
+   output.
+ */
+off_t base64_get_full_encoded_size(struct base64_encoder *enc, off_t src_size);
 /* Translate the size of the next input to the size of the output once encoded.
    This yields the amount of data appended to the dest buffer by
    base64_encode_more() with the indicated src_size. */
-- 
2.47.3