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base64: Map input files into memory for reading

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We do the same thing with the gzip utility for performance.

This reduces the runtime of `./bin/base64 enwik8 >/dev/null` from
0.428s to 0.303s.

This reduces the runtime of `./bin/base64 -d enwik8.base64 >/dev/null`
from 0.632s to 0.469s.

(enwik8 is a 100MB test file from http://mattmahoney.net/dc/enwik8.zip)
This commit is contained in:
Timothy Flynn 2024-03-20 11:38:59 -04:00 committed by Andreas Kling
parent 81ad6de41b
commit aad110ec7e
1 changed files with 14 additions and 4 deletions
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18
Userland/Utilities/base64.cpp
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@ -7,6 +7,7 @@
#include <AK/Base64.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <LibCore/MappedFile.h>
#include <LibCore/System.h>
#include <LibMain/Main.h>
@ -36,18 +37,27 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
args_parser.add_positional_argument(filepath, "", "file", Core::ArgsParser::Required::No);
args_parser.parse(arguments);
auto file = TRY(Core::File::open_file_or_standard_stream(filepath, Core::File::OpenMode::Read));
ByteBuffer buffer = TRY(file->read_until_eof());
Variant<Empty, ByteBuffer, NonnullOwnPtr<Core::MappedFile>> buffer_or_file;
ReadonlyBytes input_bytes;
if (filepath.is_empty() || filepath == "-"sv) {
auto file = TRY(Core::File::standard_input());
buffer_or_file = TRY(file->read_until_eof());
input_bytes = buffer_or_file.get<ByteBuffer>();
} else if (TRY(Core::System::stat(filepath)).st_size > 0) {
buffer_or_file = TRY(Core::MappedFile::map(filepath));
input_bytes = buffer_or_file.get<NonnullOwnPtr<Core::MappedFile>>()->bytes();
}
TRY(Core::System::pledge("stdio"));
if (decode) {
auto decoded = TRY(decode_base64(buffer));
auto decoded = TRY(decode_base64(input_bytes));
out("{}", StringView(decoded.bytes()));
return 0;
}
auto encoded = TRY(encode_base64(buffer));
auto encoded = TRY(encode_base64(input_bytes));
if (maybe_column.has_value() && *maybe_column > 0) {
print_wrapped_output(*maybe_column, encoded);