[ChangeLog]

When decoding, always allow newlines in input, with almost no
performance impact.
* src/base64.c (do_decode): Initialize decode context.
Call base64_decode one more time, after all input is processed.
(usage): When decoding, newlines are always accepted.

* tests/misc/base64: Add a bunch of tests, for the above.
* gl/lib/base64.c: Include <string.h>.
(base64_decode_ctx_init, get_4, decode_4): New functions.
(base64_decode): Efficiently handle interspersed newlines.
(base64_decode_alloc): Update signature.
* gl/lib/base64.h (struct base64_decode_context): Define.
(base64_decode_ctx_init): Add prototype.
(base64_decode, base64_decode_alloc): Update prototypes.
[doc/ChangeLog]
* coreutils.texi (base64 invocation): When decoding, newlines
are always accepted.

1 files changed, 2 insertions, 1 deletions

diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index ae072d74d..6fc670479 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -1849,7 +1849,8 @@ output will be the original data.
 @opindex -i
 @opindex --ignore-garbage
 @cindex Ignore garbage in base64 stream
-During decoding, ignore unrecognized characters (including newline),
+When decoding, newlines are always accepted.
+During decoding, ignore unrecognized bytes,
 to permit distorted data to be decoded.
 
 @end table