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LibCore: Add an automatically allocating MemoryStream

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Similar to AK::DuplexStream, this writes to the end and reads from the
beginning of a dynamically allocated buffer.
This commit is contained in:
Tim Schumacher 2022-12-07 17:43:31 +01:00 • committed by Linus Groh
parent 8dbc7aa63f
commit f205f62a44
3 changed files with 200 additions and 0 deletions
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53
Tests/LibCore/TestLibCoreStream.cpp
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@ -5,8 +5,10 @@
*/
#include <AK/Format.h>
#include <AK/String.h>
#include <LibCore/EventLoop.h>
#include <LibCore/LocalServer.h>
#include <LibCore/MemoryStream.h>
#include <LibCore/Stream.h>
#include <LibCore/TCPServer.h>
#include <LibCore/Timer.h>
@ -504,3 +506,54 @@ TEST_CASE(buffered_tcp_socket_read)
auto second_received_line = maybe_second_received_line.value();
EXPECT_EQ(second_received_line, second_line);
}
// Allocating memory stream tests
TEST_CASE(allocating_memory_stream_empty)
{
Core::Stream::AllocatingMemoryStream stream;
EXPECT_EQ(stream.used_buffer_size(), 0ul);
{
Array<u8, 32> array;
auto read_bytes = MUST(stream.read(array));
EXPECT_EQ(read_bytes.size(), 0ul);
}
}
TEST_CASE(allocating_memory_stream_10kb)
{
auto file = MUST(Core::Stream::File::open("/usr/Tests/LibCore/10kb.txt"sv, Core::Stream::OpenMode::Read));
size_t const file_size = MUST(file->size());
size_t constexpr test_chunk_size = 4096;
// Read file contents into the memory stream.
Core::Stream::AllocatingMemoryStream stream;
while (!file->is_eof()) {
Array<u8, test_chunk_size> array;
MUST(stream.write(MUST(file->read(array))));
}
EXPECT_EQ(stream.used_buffer_size(), file_size);
MUST(file->seek(0, Core::Stream::SeekMode::SetPosition));
// Check the stream contents when reading back.
size_t offset = 0;
while (!file->is_eof()) {
Array<u8, test_chunk_size> file_array;
Array<u8, test_chunk_size> stream_array;
auto file_span = MUST(file->read(file_array));
auto stream_span = MUST(stream.read(stream_array));
EXPECT_EQ(file_span.size(), stream_span.size());
for (size_t i = 0; i < file_span.size(); i++) {
if (file_array[i] == stream_array[i])
continue;
FAIL(String::formatted("Data started to diverge at index {}: file={}, stream={}", offset + i, file_array[i], stream_array[i]));
}
offset += file_span.size();
}
}