1 files changed, 103 insertions, 0 deletions
diff --git a/src/lib/json-utils.cpp b/src/lib/json-utils.cpp
new file mode 100644
index 0000000..742fbc1
--- /dev/null
+++ b/src/lib/json-utils.cpp
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2021, [Ribose Inc](https://www.ribose.com).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "json-utils.h"
+#include "logging.h"
+#include "crypto/mem.h"
+
+/* Shortcut function to add field checking it for null to avoid allocation failure.
+   Please note that it deallocates val on failure. */
+bool
+obj_add_field_json(json_object *obj, const char *name, json_object *val)
+{
+    if (!val) {
+        return false;
+    }
+    // TODO: in JSON-C 0.13 json_object_object_add returns bool instead of void
+    json_object_object_add(obj, name, val);
+    if (!json_object_object_get_ex(obj, name, NULL)) {
+        json_object_put(val);
+        return false;
+    }
+
+    return true;
+}
+
+bool
+json_add(json_object *obj, const char *name, const char *value)
+{
+    return obj_add_field_json(obj, name, json_object_new_string(value));
+}
+
+bool
+json_add(json_object *obj, const char *name, bool value)
+{
+    return obj_add_field_json(obj, name, json_object_new_boolean(value));
+}
+
+bool
+json_add(json_object *obj, const char *name, const char *value, size_t len)
+{
+    return obj_add_field_json(obj, name, json_object_new_string_len(value, len));
+}
+
+bool
+obj_add_hex_json(json_object *obj, const char *name, const uint8_t *val, size_t val_len)
+{
+    if (val_len > 1024 * 1024) {
+        RNP_LOG("too large json hex field: %zu", val_len);
+        val_len = 1024 * 1024;
+    }
+
+    char   smallbuf[64] = {0};
+    size_t hexlen = val_len * 2 + 1;
+
+    char *hexbuf = hexlen < sizeof(smallbuf) ? smallbuf : (char *) malloc(hexlen);
+    if (!hexbuf) {
+        return false;
+    }
+
+    bool res = rnp::hex_encode(val, val_len, hexbuf, hexlen, rnp::HEX_LOWERCASE) &&
+               obj_add_field_json(obj, name, json_object_new_string(hexbuf));
+
+    if (hexbuf != smallbuf) {
+        free(hexbuf);
+    }
+    return res;
+}
+
+bool
+array_add_element_json(json_object *obj, json_object *val)
+{
+    if (!val) {
+        return false;
+    }
+    if (json_object_array_add(obj, val)) {
+        json_object_put(val);
+        return false;
+    }
+    return true;
+}