upload hash_file.cpp

tools/hash_file.cpp

@@ -0,0 +1,50 @@
+#include <iostream>
+#include <stdexcept>
+#include <string>
+#include <fstream>
+#include <filesystem>
+#include <iomanip>
+
+static std::string readFileData(const std::string &filepath) {
+    if (filepath == "") { return ""; }
+    std::ifstream file(filepath, std::ios::binary | std::ios::ate);
+    if (!file) throw std::runtime_error("Cannot open file.");
+    std::streamsize fileSize = file.tellg();
+    file.seekg(0, std::ios::beg);
+    std::string data(fileSize, '\0');
+    if (!file.read(&data[0], fileSize)) throw std::runtime_error("Cannot read file data.");
+    return data;
+}
+
+std::size_t hashFile(const std::string &filepath) {
+    const std::string data = readFileData(filepath);
+    if (data == "") { return 0; }
+    return std::hash<std::string>{}(data);
+}
+
+int main(int argc, char *argv[]) {
+    if (argc != 2) {
+        std::cerr << "Usage: " << argv[0] << " <file_path>" << std::endl;
+        return 1;
+    }
+
+    std::string filepath = argv[1];
+
+    try {
+        if (!std::filesystem::exists(filepath)) {
+            std::cerr << "Error: File does not exist." << std::endl;
+            return 1;
+        }
+
+        std::size_t fileHash = hashFile(filepath);
+        std::cout << "Hash of file '" << filepath << "': "
+            << fileHash << " :: "
+            << std::hex << std::uppercase << std::showbase << fileHash
+            << std::endl;
+    } catch (const std::exception &e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+        return 1;
+    }
+
+    return 0;
+}