Initial commit

cmd/nca-to-nsp/main.go

@@ -0,0 +1,106 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"nca-to-nsp/pkg/nsp"
+	"os"
+)
+
+// Application information
+const (
+	appName        = "nca-to-nsp"
+	appVersion     = "1.0.0"
+	appDescription = "A utility to package Nintendo Content Archive (NCA) " +
+		"files into a Nintendo Submission Package (NSP)."
+)
+
+// exitWithError prints an error message to stderr and exits the program with
+// code 1.
+// Accepts either a single value or a format string with arguments.
+func exitWithError(arg any, args ...any) {
+	var msg string
+
+	if len(args) == 0 {
+		msg = fmt.Sprintf("%v", arg)
+	} else {
+		msg = fmt.Sprintf(arg.(string), args...)
+	}
+
+	fmt.Fprintf(os.Stderr, "Error: %s\n", msg)
+	os.Exit(1)
+}
+
+// printDescription displays application description to stdout
+func printDescription() {
+	fmt.Printf("%s v%s - %s\n\n", appName, appVersion, appDescription)
+}
+
+// Display the application usage information and exits.
+func printUsage() {
+	fmt.Println("Usage:")
+	fmt.Printf(
+		"  %s -o <output.nsp> [options] file1.nca [file2.nca ...]\n\n",
+		os.Args[0],
+	)
+	fmt.Println("Options:")
+	flag.PrintDefaults()
+}
+
+// printVersion displays the application version information to stdout
+func printVersion() {
+	fmt.Printf("%s v%s\n", appName, appVersion)
+}
+
+func main() {
+	helpFlag := flag.Bool("h", false, "Display help information")
+	versionFlag := flag.Bool("v", false, "Display version information")
+	outputName := flag.String("o", "out.nsp", "NSP output file name")
+	bufferSize := flag.Int(
+		"buffer",
+		nsp.DefaultBufferSize,
+		"Buffer size for file copying operations",
+	)
+	showProgress := flag.Bool(
+		"progress",
+		false,
+		"Show progress bar during NSP creation",
+	)
+	flag.Parse()
+
+	if *helpFlag {
+		printDescription()
+		printUsage()
+		os.Exit(0)
+	}
+
+	if *versionFlag {
+		printVersion()
+		os.Exit(0)
+	}
+
+	ncaFiles := flag.Args()
+
+	if len(ncaFiles) == 0 {
+		fmt.Fprintln(os.Stderr, "Error: no NCA files specified")
+		printUsage()
+		os.Exit(1)
+	}
+
+	builder := nsp.Builder{
+		OutputPath:              *outputName,
+		BufferSize:              *bufferSize,
+		ShowProgress:            *showProgress,
+		ProgressUpdateFrequency: 100,
+	}
+
+	if err := builder.AddFiles(ncaFiles); err != nil {
+		exitWithError("Failed to add files to NSP builder: %v", err)
+	}
+
+	if err := builder.Build(); err != nil {
+		exitWithError("Failed to build NSP file: %v", err)
+	}
+
+	fmt.Printf("Successfully built NSP file: %s\n", *outputName)
+}