From 010935eb97de1092de7a22ef724858725ee32827 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niels=20M=C3=B6ller?= <nisse@lysator.liu.se>
Date: Tue, 1 Oct 2002 11:08:02 +0200
Subject: [PATCH] (BASE64_DECODE_LENGTH): Comment fix.
Rev: src/nettle/base64.h:1.6
---
base64.h | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/base64.h b/base64.h
index d69c9ccd..c91c5b33 100644
--- a/base64.h
+++ b/base64.h
@@ -65,8 +65,14 @@ base64_decode_update(struct base64_ctx *ctx,
unsigned src_length,
const uint8_t *src);
-/* FIXME: Does this always round correctly? */
-/* Maximum length of decoded data */
+/* Maximum length of decoded data.
+ *
+ * NOTE: This size should work even for improper base 64 data. For
+ * example, consider an (encoded) input string of two bytes. When
+ * we'll generate one byte of output before noticing that the input is
+ * truncated. And BASE64_DECODE_LENGTH(2) == 2*3/4 == 1, so that is
+ * just fine. */
+
#define BASE64_DECODE_LENGTH(src_length) \
((src_length) * BASE64_BINARY_BLOCK_SIZE / BASE64_TEXT_BLOCK_SIZE)
--
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