Add Base64 decoder.

* NEWS: Add interface changes.
* src/Makefile.am (libgpg_error_la_SOURCES): Add b64dec.c.
* src/b64dec.c: New.  Taken from gpgme.  Prefix function names with
_gpgrt_.  Change API a bit, not exposing the structure.
* src/gpg-error.def.in: Export Base64 functions.
* src/gpg-error.vers: Likewise.
* src/visibility.c, src/visibility.h: Likewise.
* src/gpg-error.h.in: Add Base64 struct and functions.
* src/gpgrt-int.h: Add Base64 internal functions.
* tests/Makefile.am (TESTS): Add t-b64dec.
* tests/t-b64dec.c: New.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>

2 files changed, 124 insertions, 1 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 92b97f2..a3c6cbd 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -27,7 +27,7 @@ endif
 
 gpg_error_lib = ../src/libgpg-error.la
 
-TESTS = t-version t-strerror t-syserror t-lock t-printf t-poll
+TESTS = t-version t-strerror t-syserror t-lock t-printf t-poll t-b64dec
 
 AM_CPPFLAGS = -I$(top_builddir)/src $(extra_includes)
 
diff --git a/tests/t-b64dec.c b/tests/t-b64dec.c
new file mode 100644
index 0000000..aae208b
--- /dev/null
+++ b/tests/t-b64dec.c
@@ -0,0 +1,123 @@
+/* t-b64dec.c - b64dec test.
+   Copyright (C) 2017 g10 Code GmbH
+
+   This file is part of libgpg-error.
+
+   libgpg-error is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public License
+   as published by the Free Software Foundation; either version 2.1 of
+   the License, or (at your option) any later version.
+
+   libgpg-error is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with libgpgme-error; if not, write to the Free
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+   02110-1301, USA.  */
+
+#if HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <string.h>
+#if HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+
+#include <gpg-error.h>
+
+static const char *test_b64_string = "bGliZ3BnLWVycm9yIGlzIGZyZWUgc29"
+  "mdHdhcmU7IHlvdSBjYW4gcmVkaXN0cmlidXRlIGl0IGFuZC9vciBtb2RpZnkgaXQgd"
+  "W5kZXIgdGhlIHRlcm1zIG9mIHRoZSBHTlUgTGVzc2VyIEdlbmVyYWwgUHVibGljIEx"
+  "pY2Vuc2UgYXMgcHVibGlzaGVkIGJ5IHRoZSBGcmVlIFNvZnR3YXJlIEZvdW5kYXRpb"
+  "247IGVpdGhlciB2ZXJzaW9uIDIuMSBvZiB0aGUgTGljZW5zZSwgb3IgKGF0IHlvdXI"
+  "gb3B0aW9uKSBhbnkgbGF0ZXIgdmVyc2lvbi4=";
+
+static const char *test_string = "libgpg-error is free software; "
+  "you can redistribute it and/or modify it under the terms of "
+  "the GNU Lesser General Public License as published by the Free "
+  "Software Foundation; either version 2.1 of the License, or "
+  "(at your option) any later version.";
+
+#define fail(a)  do { fprintf (stderr, "%s:%d: test %d failed\n",\
+                               __FILE__,__LINE__, (a));          \
+                     errcount++;                                 \
+                   } while(0)
+
+static int errcount;
+
+static gpg_error_t
+test_b64dec_string (const char *string, const char *expected)
+{
+  gpg_error_t err;
+  gpgrt_b64state_t state;
+  char *buffer;
+  size_t len;
+
+  len = strlen (string);
+  buffer = malloc (strlen (string) + 1);
+  if (!buffer)
+    {
+      err = gpg_error_from_syserror ();
+      return err;
+    }
+
+  state = gpgrt_b64dec_start ("");
+  if (!state)
+    {
+      err = gpg_error_from_syserror ();
+      free (buffer);
+      return err;
+    }
+
+  err = gpgrt_b64dec_proc (state, buffer, len, &len);
+  if (err)
+    {
+      if (gpg_err_code (err) != GPG_ERR_EOF)
+        {
+          free (buffer);
+          free (state);
+          return err;
+        }
+    }
+
+  err = gpgrt_b64dec_finish (state);
+  if (err)
+    {
+      free (buffer);
+      return err;
+    }
+
+  if (strncmp (buffer, expected, len) == 0)
+    err = 0;
+  else
+    err = GPG_ERR_INTERNAL;
+
+  free (buffer);
+  return err;
+}
+
+
+
+int
+main (int argc, char **argv)
+{
+  gpg_error_t err;
+
+  (void)argc;
+  (void)argv;
+
+  err = test_b64dec_string (test_b64_string, test_string);
+
+  if (err)
+    {
+      fail (1);
+      return 1;
+    }
+  else
+    return 0;
+}