adding library for basic JSON conversions

1 files changed, 146 insertions, 0 deletions

diff --git a/src/json/json_generator.c b/src/json/json_generator.c
new file mode 100644
index 000000000..4b1ac31b1
--- /dev/null
+++ b/src/json/json_generator.c
@@ -0,0 +1,146 @@
+/*
+  This file is part of GNUnet
+  Copyright (C) 2014, 2015, 2016 GNUnet e.V.
+
+  GNUnet 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, or (at your option) any later version.
+
+  GNUnet 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
+  GNUnet; see the file COPYING.  If not, If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file json/json_generator.c
+ * @brief helper functions for generating JSON from GNUnet data structures
+ * @author Sree Harsha Totakura <sreeharsha@totakura.in>
+ */
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_json_lib.h"
+
+
+/**
+ * Convert binary data to a JSON string
+ * with the base32crockford encoding.
+ *
+ * @param data binary data
+ * @param size size of @a data in bytes
+ * @return json string that encodes @a data
+ */
+json_t *
+GNUNET_JSON_from_data (const void *data,
+                       size_t size)
+{
+  char *buf;
+  json_t *json;
+
+  buf = GNUNET_STRINGS_data_to_string_alloc (data, size);
+  json = json_string (buf);
+  GNUNET_free (buf);
+  return json;
+}
+
+
+/**
+ * Convert absolute timestamp to a json string.
+ *
+ * @param stamp the time stamp
+ * @return a json string with the timestamp in @a stamp
+ */
+json_t *
+GNUNET_JSON_from_time_abs (struct GNUNET_TIME_Absolute stamp)
+{
+  json_t *j;
+  char *mystr;
+  int ret;
+
+  GNUNET_assert (GNUNET_OK ==
+                 GNUNET_TIME_round_abs (&stamp));
+  if (stamp.abs_value_us == GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us)
+    return json_string ("/never/");
+  ret = GNUNET_asprintf (&mystr,
+                         "/Date(%llu)/",
+                         (unsigned long long) (stamp.abs_value_us / (1000LL * 1000LL)));
+  GNUNET_assert (ret > 0);
+  j = json_string (mystr);
+  GNUNET_free (mystr);
+  return j;
+}
+
+
+/**
+ * Convert relative timestamp to a json string.
+ *
+ * @param stamp the time stamp
+ * @return a json string with the timestamp in @a stamp
+ */
+json_t *
+GNUNET_JSON_from_time_rel (struct GNUNET_TIME_Relative stamp)
+{
+  json_t *j;
+  char *mystr;
+  int ret;
+
+  GNUNET_assert (GNUNET_OK ==
+                 GNUNET_TIME_round_rel (&stamp));
+  if (stamp.rel_value_us == GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us)
+    return json_string ("/forever/");
+  ret = GNUNET_asprintf (&mystr,
+                         "/Delay(%llu)/",
+                         (unsigned long long) (stamp.rel_value_us / (1000LL * 1000LL)));
+  GNUNET_assert (ret > 0);
+  j = json_string (mystr);
+  GNUNET_free (mystr);
+  return j;
+}
+
+
+/**
+ * Convert RSA public key to JSON.
+ *
+ * @param pk public key to convert
+ * @return corresponding JSON encoding
+ */
+json_t *
+GNUNET_JSON_from_rsa_public_key (const struct GNUNET_CRYPTO_rsa_PublicKey *pk)
+{
+  char *buf;
+  size_t buf_len;
+  json_t *ret;
+
+  buf_len = GNUNET_CRYPTO_rsa_public_key_encode (pk,
+                                                 &buf);
+  ret = GNUNET_JSON_from_data (buf,
+                               buf_len);
+  GNUNET_free (buf);
+  return ret;
+}
+
+
+/**
+ * Convert RSA signature to JSON.
+ *
+ * @param sig signature to convert
+ * @return corresponding JSON encoding
+ */
+json_t *
+GNUNET_JSON_from_rsa_signature (const struct GNUNET_CRYPTO_rsa_Signature *sig)
+{
+  char *buf;
+  size_t buf_len;
+  json_t *ret;
+
+  buf_len = GNUNET_CRYPTO_rsa_signature_encode (sig,
+                                                &buf);
+  ret = GNUNET_JSON_from_data (buf,
+                               buf_len);
+  GNUNET_free (buf);
+  return ret;
+}
+
+
+/* End of json/json_generator.c */