added level hashes and finished credits

engine/Utils.cc

@@ -53,3 +53,45 @@ std::string sha256_hash (std::string input) {
 
 	return std::string (result_buf, 64);
 }
+
+std::string sha256_hash_file (const char *filename) {
+	// we simply read the whole file into a string and hash this
+	std::ifstream file_stream (filename, std::ios_base::binary);
+	if (!file_stream.is_open()) {
+		std::cerr << "Could not hash file " << filename << ": could not open file." << std::endl;
+		return "";
+	}
+
+
+	file_stream.seekg (0,std::ios_base::end);
+	std::streampos file_end = file_stream.tellg();
+
+	int file_size = static_cast<int> (file_end);
+	if (file_size == 0) {
+		std::cerr << "Could not hash file " << filename << ": file has no content!" << std::endl;
+		return "";
+	}
+
+	unsigned char *file_buffer = NULL;
+	file_buffer = new unsigned char[file_size];
+
+	file_stream.seekg(0, std::ios_base::beg);
+	file_stream.read ((char*)file_buffer, file_size);
+
+	char result_buf[64];
+
+	SHA256_CTX ctx256;
+
+	SHA256_Init(&ctx256);
+	SHA256_Update(&ctx256, file_buffer, file_size);
+	SHA256_End (&ctx256, result_buf);
+
+	file_stream.close();
+
+	delete[] file_buffer;
+
+//	std::cerr << "file hash is " << std::string (result_buf, 64) << std::endl;
+
+	return std::string (result_buf, 64);
+}
+

engine/Utils.h

@@ -6,5 +6,6 @@
 std::string strip_whitespaces (const std::string input_str);
 bool create_dir (const std::string &dir_str);
 std::string sha256_hash (std::string input);
+std::string sha256_hash_file (const char *filename);
 
 #endif /* _UTILS_H */