fix: crJson bindings

Author: tmathern

include/c2pa.hpp

@@ -935,6 +935,14 @@ namespace c2pa
         /// @throws C2paException for errors encountered by the C2PA library.
         std::string detailed_json() const;
 
+        /// @brief Get the manifest store as a pretty-printed crJSON string.
+        /// @details crJSON is a standardized JSON format for C2PA manifest data.
+        ///          This call is yields valid empty JSON ("{}") if there are not
+        ///          Content Credentials to show.
+        /// @return The manifest store as a crJSON string.
+        /// @throws C2paException if the underlying C call returns null.
+        std::string crjson() const;
+
         /// @brief Get a resource from the reader and write it to a file.
         /// @param uri The URI of the resource.
         /// @param path The file path to write the resource to.

src/c2pa_reader.cpp

@@ -167,6 +167,11 @@ namespace c2pa
         return detail::c_string_to_string(c2pa_reader_detailed_json(c2pa_reader));
     }
 
+    std::string Reader::crjson() const
+    {
+        return detail::c_string_to_string(c2pa_reader_crjson(c2pa_reader));
+    }
+
     [[nodiscard]] std::optional<std::string> Reader::remote_url() const {
         auto url = c2pa_reader_remote_url(c2pa_reader);
         if (url == nullptr) { return std::nullopt; }

tests/reader.test.cpp

@@ -694,3 +694,29 @@ TEST_F(ReaderTest, ReadArchive)
     EXPECT_TRUE(active_manifest.contains("ingredients"));
     EXPECT_EQ(active_manifest["ingredients"].size(), 2);
 }
+
+TEST_F(ReaderTest, ReaderCrJson)
+{
+    fs::path current_dir = fs::path(__FILE__).parent_path();
+    fs::path test_file = current_dir / "../tests/fixtures/cloud.jpg";
+    ASSERT_TRUE(std::filesystem::exists(test_file)) << "Test file does not exist: " << test_file;
+
+    auto reader = c2pa::Reader(test_file);
+    auto crjson = reader.crjson();
+    EXPECT_FALSE(crjson.empty());
+}
+
+TEST_F(ReaderTest, ReaderCrJsonSpecialChars)
+{
+    auto current_dir = fs::path(__FILE__).parent_path();
+    #ifdef _WIN32
+      auto test_file = current_dir.parent_path() / "tests" / "fixtures" / L"CÖÄ_.jpg";
+    #else
+      auto test_file = current_dir.parent_path() / "tests" / "fixtures" / "CÖÄ_.jpg";
+    #endif
+    ASSERT_TRUE(std::filesystem::exists(test_file)) << "Test file does not exist: " << test_file;
+
+    auto reader = c2pa::Reader(test_file);
+    auto crjson = reader.crjson();
+    EXPECT_FALSE(crjson.empty());
+}