Add file reading

src/main.cpp

@@ -1,6 +1,62 @@
-#include <rapidjson/document.h>
-
-#include <cstdlib>
+#include <exception>
+#include <fstream>
 #include <iostream>
+#include <span>
+#include <stdexcept>
+#include <string>
+
+constexpr double GIGABYTE = 1e9;
+
+/**
+ * Reads the contents of a file into a dynamically allocated buffer.
+ *
+ * @param filename The name of the file to be read.
+ * @return A string containing the contents of the file.
+ */
+std::string readFile(const std::string& filename) {
+    std::ifstream file(filename, std::ios::binary | std::ios::ate);
+
+    if (!file) {
+        throw std::runtime_error("Error opening file: " + filename);
+    }
+
+    auto fileSize = file.tellg();
+    file.seekg(0, std::ios::beg);
+
+    std::string buffer(fileSize, '\0');
+
+    if (!file.read(buffer.data(), fileSize)) {
+        throw std::runtime_error("Error reading file: " + filename);
+    }
+
+    return buffer;
+}
+
+int main(int argc, char* argv[]) {
+    try {
+        auto args = std::span(argv, argc);
+
+        if (argc < 2) {
+            std::cerr << "Usage: " << args[0] << " <filename>" << "\n";
+            return 1;
+        }
+
+        const std::string filename = args[1];
+
+        std::cout << "Reading file: " << filename << "\n";
+        auto buffer = readFile(filename);
+        std::cout << "Done reading! File size: " << static_cast<double>(buffer.size()) / GIGABYTE << " GB" << "\n";
+
+        if (buffer.empty()) {
+            return 1;
+        }
 
-int main() { return EXIT_SUCCESS; }
+    } catch (const std::exception& e) {
+        std::cerr << "Exception caught: " << e.what() << "\n";
+        return 1;
+    } catch (...) {
+        std::cerr << "Unknown exception caught" << "\n";
+        return 1;
+    }
+    return 0;
+}