apps: Add base64

apps/CMakeLists.txt

@@ -25,3 +25,4 @@ luna_app(mkdir.cpp mkdir OFF)
 luna_app(rm.cpp rm OFF)
 luna_app(stat.cpp stat OFF)
 luna_app(uname.cpp uname OFF)
+luna_app(base64.cpp base64 OFF)

apps/base64.cpp

@@ -0,0 +1,41 @@
+#include <luna/Base64.h>
+#include <os/ArgumentParser.h>
+#include <os/File.h>
+
+Result<int> luna_main(int argc, char** argv)
+{
+    StringView path;
+    bool decode { false };
+    bool allow_garbage { false };
+
+    os::ArgumentParser parser;
+    parser.add_description("Encode or decode Base64 data. If not given a file, reads from standard input.");
+    parser.add_positional_argument(path, "file", "-"_sv);
+    parser.add_switch_argument(decode, 'd', "decode", "decode data");
+    parser.add_switch_argument(allow_garbage, ' ', "allow-garbage", "ignore non-base64 characters");
+    parser.parse(argc, argv);
+
+    auto file = TRY(os::File::open_input_file(path));
+
+    auto output = os::File::standard_output();
+
+    if (!decode)
+    {
+        auto data = TRY(file->read_all());
+
+        auto encoded = TRY(Base64::encode(data));
+
+        output->write(encoded.view());
+        output->write("\n"_sv);
+    }
+    else
+    {
+        auto data = TRY(file->read_all_as_string());
+
+        auto decoded = TRY(Base64::decode(data.view(), allow_garbage));
+
+        output->write(decoded);
+    }
+
+    return 0;
+}