[gmime] Fixed GMimeFilterBasic for uudecode

[Rico Tzschichholz <ricotz src gnome org>]

commit 21f265b6b3558ce34afaee6bea21b85e4b16d0cd
Author: Jeffrey Stedfast <jestedfa microsoft com>
Date:   Sun Nov 25 18:28:03 2018 -0500

    Fixed GMimeFilterBasic for uudecode
    
    Don't allow the outbuf to ever get set to NULL which could happen
    if the begin-line had not yet been found (and thus
    g_mime_filter_set_size() had never been called to allocate the
    outbuf buffer).

 gmime/gmime-filter-basic.c | 8 +++++---
 tests/test-encoders.c      | 4 ++--
 2 files changed, 7 insertions(+), 5 deletions(-)
---
diff --git a/gmime/gmime-filter-basic.c b/gmime/gmime-filter-basic.c
index f179fb68..9ba7777f 100644
--- a/gmime/gmime-filter-basic.c
+++ b/gmime/gmime-filter-basic.c
@@ -138,7 +138,7 @@ filter_filter (GMimeFilter *filter, char *inbuf, size_t inlen, size_t prespace,
                        
                        while (inptr < inend) {
                                left = inend - inptr;
-                               if (left < 6) {
+                               if (left <= 6) {
                                        if (!strncmp (inptr, "begin ", left))
                                                g_mime_filter_backup (filter, inptr, left);
                                        break;
@@ -174,7 +174,10 @@ filter_filter (GMimeFilter *filter, char *inbuf, size_t inlen, size_t prespace,
                        break;
                default:
                        /* either we haven't seen the begin-line or we've finished decoding */
-                       goto done;
+                       *outprespace = filter->outpre;
+                       *outlen = nwritten;
+                       *outbuf = inbuf;
+                       return;
                }
        }
        
@@ -183,7 +186,6 @@ filter_filter (GMimeFilter *filter, char *inbuf, size_t inlen, size_t prespace,
        nwritten = g_mime_encoding_step (encoder, inbuf, inlen, filter->outbuf);
        g_assert (nwritten <= len);
        
- done:
        *outprespace = filter->outpre;
        *outbuf = filter->outbuf;
        *outlen = nwritten;
diff --git a/tests/test-encoders.c b/tests/test-encoders.c
index 989d26f3..1aa2c0b5 100644
--- a/tests/test-encoders.c
+++ b/tests/test-encoders.c
@@ -358,8 +358,8 @@ int main (int argc, char **argv)
        test_encoder (GMIME_CONTENT_ENCODING_UUENCODE, photo, uu, 1);
        test_decoder (GMIME_CONTENT_ENCODING_UUENCODE, uu, photo, 4096);
        test_decoder (GMIME_CONTENT_ENCODING_UUENCODE, uu, photo, 1024);
-       //test_decoder (GMIME_CONTENT_ENCODING_UUENCODE, uu, photo, 16);
-       //test_decoder (GMIME_CONTENT_ENCODING_UUENCODE, uu, photo, 1);
+       test_decoder (GMIME_CONTENT_ENCODING_UUENCODE, uu, photo, 16);
+       test_decoder (GMIME_CONTENT_ENCODING_UUENCODE, uu, photo, 1);
        testsuite_end ();
        
        g_mime_shutdown ();