tests: Added self-test of bit string functions.

3 files changed, 184 insertions, 2 deletions

diff --git a/NEWS b/NEWS
index 1be6353..97d5f7b 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,7 @@
 GNU Libtasn1 NEWS                                     -*- outline -*-
 
 * Noteworthy changes in release 2.11 (????-??-??) [stable]
+- tests: Added self-test of bit string functions.
 - build: Added windows/libtasn14win.mk rules to produce Windows binaries.
 
 * Noteworthy changes in release 2.10 (2011-10-25) [stable]
diff --git a/tests/Makefile.am b/tests/Makefile.am
index ed76bf4..bc03513 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -34,10 +34,10 @@ dist_check_SCRIPTS += threadsafety
 MOSTLYCLEANFILES = Test_parser_ERROR.asn
 
 check_PROGRAMS = Test_parser Test_tree Test_encoding Test_indefinite	\
-	Test_errors
+	Test_errors Test_simple
 
 TESTS = Test_parser Test_tree Test_encoding Test_indefinite	\
-	Test_errors crlf threadsafety
+	Test_errors Test_simple crlf threadsafety
 
 TESTS_ENVIRONMENT = \
 	ASN1PARSER=$(srcdir)/Test_parser.asn \
diff --git a/tests/Test_simple.c b/tests/Test_simple.c
new file mode 100644
index 0000000..648cfab
--- /dev/null
+++ b/tests/Test_simple.c
@@ -0,0 +1,181 @@
+/*
+ * Copyright (C) 2011 Free Software Foundation, Inc.
+ *
+ * This file is part of LIBTASN1.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Written by Simon Josefsson
+ *
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "libtasn1.h"
+
+struct tv
+{
+  const char *name;
+  size_t bitlen;
+  const char *bitstr;
+  size_t derlen;
+  const char *der;
+};
+
+static const struct tv tv[] = {
+  { "foo", 0, "", 2, "\x01\x00" },
+  { "foo", 1, "\xFF", 3, "\x02\x07\x80" },
+  { "foo", 2, "\xFF", 3, "\x02\x06\xc0" },
+  { "foo", 3, "\xFF", 3, "\x02\x05\xe0" },
+  { "foo", 4, "\xFF", 3, "\x02\x04\xf0" },
+  { "foo", 5, "\xFF", 3, "\x02\x03\xf8" },
+  { "foo", 6, "\xFF", 3, "\x02\x02\xfc" },
+  { "foo", 7, "\xFF", 3, "\x02\x01\xfe" },
+  { "foo", 8, "\xFF\xFF", 3, "\x02\x00\xff" },
+  { "foo", 9, "\xFF\xFF", 4, "\x03\x07\xff\x80" },
+  { "foo", 10, "\xFF\xFF", 4, "\x03\x06\xff\xc0" },
+  { "foo", 11, "\xFF\xFF", 4, "\x03\x05\xff\xe0" },
+  { "foo", 12, "\xFF\xFF", 4, "\x03\x04\xff\xf0" },
+  { "foo", 13, "\xFF\xFF", 4, "\x03\x03\xff\xf8" },
+  { "foo", 14, "\xFF\xFF", 4, "\x03\x02\xff\xfc" },
+  { "foo", 15, "\xFF\xFF", 4, "\x03\x01\xff\xfe" },
+  { "foo", 16, "\xFF\xFF", 4, "\x03\x00\xff\xff" },
+  { "foo", 17, "\xFF\xFF\xFF", 5, "\x04\x07\xff\xff\x80" },
+  { "foo", 18, "\xFF\xFF\xFF", 5, "\x04\x06\xff\xff\xc0" },
+  { "foo", 19, "\xFF\xFF\xFF", 5, "\x04\x05\xff\xff\xe0" },
+};
+
+int
+main (int argc, char *argv[])
+{
+  asn1_retCode result;
+  unsigned char der[100];
+  unsigned char str[100];
+  int der_len = sizeof (der);
+  int str_size = sizeof (str);
+  int ret_len, bit_len;
+  size_t i;
+
+  /* Dummy test */
+
+  asn1_bit_der (NULL, 0, der, &der_len);
+  result = asn1_get_bit_der (der, 0, &ret_len, str, str_size, &bit_len);
+  if (result != ASN1_GENERIC_ERROR)
+    {
+      fprintf (stderr, "asn1_get_bit_der zero\n");
+      return 1;
+    }
+
+  /* Encode short strings with increasing bit lengths */
+
+  for (i = 0; i < sizeof (tv) / sizeof (tv[0]); i++)
+    {
+      /* Encode */
+
+      asn1_bit_der (tv[i].bitstr, tv[i].bitlen, der, &der_len);
+      if (der_len != tv[i].derlen
+	  || memcmp (der, tv[i].der, der_len) != 0)
+	{
+	  fprintf (stderr, "asn1_bit_der iter %d\n", i);
+	  return 1;
+	}
+
+      /* Decode it */
+
+      result = asn1_get_bit_der (der, der_len, &ret_len, str,
+				 str_size, &bit_len);
+      if (result != ASN1_SUCCESS || ret_len != tv[i].derlen
+	  || bit_len != tv[i].bitlen)
+	{
+	  fprintf (stderr, "asn1_get_bit_der iter %d\n", i);
+	  return 1;
+	}
+    }
+
+
+  /* Decode sample from "A Layman's Guide to a Subset of ASN.1, BER,
+     and DER" section 5.4 "BIT STRING": "The BER encoding of the BIT
+     STRING value "011011100101110111" can be any of the following,
+     among others, depending on the choice of padding bits, the form
+     of length octets [...]".
+  */
+
+  /* 03 04 06 6e 5d c0  DER encoding */
+
+  memcpy (der, "\x04\x06\x6e\x5d\xc0", 5);
+  der_len = 5;
+
+  result = asn1_get_bit_der (der, der_len, &ret_len, str, str_size, &bit_len);
+  if (result != ASN1_SUCCESS || ret_len != 5
+      || bit_len != 18 || memcmp (str, "\x6e\x5d\xc0", 3) != 0)
+    {
+      fprintf (stderr, "asn1_get_bit_der example\n");
+      return 1;
+    }
+
+  der_len = sizeof (der);
+  asn1_bit_der (str, bit_len, der, &der_len);
+  if (der_len != 5 || memcmp (der, "\x04\x06\x6e\x5d\xc0", 5) != 0)
+    {
+      fprintf (stderr, "asn1_bit_der example roundtrip\n");
+      return 1;
+    }
+
+  /* 03 04 06 6e 5d e0 padded with "100000" */
+
+  memcpy (der, "\x04\x06\x6e\x5d\xe0", 5);
+  der_len = 5;
+
+  result = asn1_get_bit_der (der, der_len, &ret_len, str, str_size, &bit_len);
+  if (result != ASN1_SUCCESS || ret_len != 5
+      || bit_len != 18 || memcmp (str, "\x6e\x5d\xe0", 3) != 0)
+    {
+      fprintf (stderr, "asn1_get_bit_der example padded\n");
+      return 1;
+    }
+
+  der_len = sizeof (der);
+  asn1_bit_der (str, bit_len, der, &der_len);
+  if (der_len != 5 || memcmp (der, "\x04\x06\x6e\x5d\xc0", 5) != 0)
+    {
+      fprintf (stderr, "asn1_bit_der example roundtrip\n");
+      return 1;
+    }
+
+  /* 03 81 04 06 6e 5d c0 long form of length octets */
+
+  memcpy (der, "\x81\x04\x06\x6e\x5d\xc0", 6);
+  der_len = 6;
+
+  result = asn1_get_bit_der (der, der_len, &ret_len, str, str_size, &bit_len);
+
+  if (result != ASN1_SUCCESS || ret_len != 6
+      || bit_len != 18 || memcmp (str, "\x6e\x5d\xc0", 3) != 0)
+    {
+      fprintf (stderr, "asn1_get_bit_der example long form\n");
+      return 1;
+    }
+
+  der_len = sizeof (der);
+  asn1_bit_der (str, bit_len, der, &der_len);
+  if (der_len != 5 || memcmp (der, "\x04\x06\x6e\x5d\xc0", 5) != 0)
+    {
+      fprintf (stderr, "asn1_bit_der example roundtrip\n");
+      return 1;
+    }
+
+  return 0;
+}