fmt

Author: HideBa

src/cpp/examples/roundtrip_test.cpp

@@ -0,0 +1,92 @@
+#include "lib.rs.h"
+
+#include <fstream>
+#include <iostream>
+#include <string>
+
+int main(int argc, char* argv[]) {
+    if (argc < 3) {
+        std::cerr << "Usage: " << argv[0] << " <input.city.jsonl> <output.fcb>" << std::endl;
+        return 1;
+    }
+
+    std::string jsonl_path = argv[1];
+    std::string fcb_path = argv[2];
+
+    try {
+        // === Step 1: Encode CityJSONSeq -> FCB ===
+        std::cout << "=== Encoding CityJSONSeq -> FCB ===" << std::endl;
+
+        std::ifstream infile(jsonl_path);
+        if (!infile.is_open()) {
+            std::cerr << "Failed to open: " << jsonl_path << std::endl;
+            return 1;
+        }
+
+        std::string line;
+        // First line is CityJSON metadata
+        if (!std::getline(infile, line)) {
+            std::cerr << "Empty input file" << std::endl;
+            return 1;
+        }
+
+        auto writer = fcb::fcb_writer_new(line);
+        std::cout << "Created writer with metadata" << std::endl;
+
+        size_t write_count = 0;
+        while (std::getline(infile, line)) {
+            if (line.empty())
+                continue;
+            fcb::fcb_writer_add_feature(*writer, line);
+            write_count++;
+        }
+        infile.close();
+
+        std::cout << "Added " << write_count << " features" << std::endl;
+
+        fcb::fcb_writer_write(std::move(writer), fcb_path);
+        std::cout << "Wrote FCB file: " << fcb_path << std::endl;
+
+        // === Step 2: Decode FCB -> read back ===
+        std::cout << "\n=== Decoding FCB ===" << std::endl;
+
+        auto reader = fcb::fcb_reader_open(fcb_path);
+        auto meta = fcb::fcb_reader_metadata(*reader);
+
+        std::cout << "Features count: " << meta.features_count << std::endl;
+        std::cout << "Has spatial index: " << (meta.has_spatial_index ? "yes" : "no") << std::endl;
+
+        auto iter = fcb::fcb_reader_select_all(std::move(reader));
+
+        size_t read_count = 0;
+        while (fcb::fcb_iterator_next(*iter)) {
+            auto feature = fcb::fcb_iterator_current(*iter);
+            read_count++;
+
+            // Print first 3 features briefly
+            if (read_count <= 3) {
+                std::cout << "  Feature " << read_count << ": ID=" << std::string(feature.id)
+                          << std::endl;
+            }
+        }
+
+        std::cout << "Total features read back: " << read_count << std::endl;
+
+        // === Step 3: Verify ===
+        std::cout << "\n=== Roundtrip Verification ===" << std::endl;
+        if (read_count == write_count) {
+            std::cout << "PASS: wrote " << write_count << " features, read back " << read_count
+                      << std::endl;
+        } else {
+            std::cerr << "FAIL: wrote " << write_count << " but read back " << read_count
+                      << std::endl;
+            return 1;
+        }
+
+    } catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+        return 1;
+    }
+
+    return 0;
+}