AK: Remove the fallible constructor from `FixedMemoryStream`

22 files changed, 120 insertions, 123 deletions

diff --git a/Userland/Libraries/LibAudio/FlacLoader.cpp b/Userland/Libraries/LibAudio/FlacLoader.cpp
index d2ba2ed2cb..26036610d4 100644
--- a/Userland/Libraries/LibAudio/FlacLoader.cpp
+++ b/Userland/Libraries/LibAudio/FlacLoader.cpp
@@ -42,7 +42,7 @@ Result<NonnullOwnPtr<FlacLoaderPlugin>, LoaderError> FlacLoaderPlugin::create(St
 
 Result<NonnullOwnPtr<FlacLoaderPlugin>, LoaderError> FlacLoaderPlugin::create(Bytes buffer)
 {
-    auto stream = LOADER_TRY(FixedMemoryStream::construct(buffer));
+    auto stream = LOADER_TRY(try_make<FixedMemoryStream>(buffer));
     auto loader = make<FlacLoaderPlugin>(move(stream));
 
     LOADER_TRY(loader->initialize());
@@ -78,8 +78,8 @@ MaybeLoaderError FlacLoaderPlugin::parse_header()
     // Receive the streaminfo block
     auto streaminfo = TRY(next_meta_block(bit_input));
     FLAC_VERIFY(streaminfo.type == FlacMetadataBlockType::STREAMINFO, LoaderError::Category::Format, "First block must be STREAMINFO");
-    auto streaminfo_data_memory = LOADER_TRY(FixedMemoryStream::construct(streaminfo.data.bytes()));
-    BigEndianInputBitStream streaminfo_data { MaybeOwned<AK::Stream>(*streaminfo_data_memory) };
+    FixedMemoryStream streaminfo_data_memory { streaminfo.data.bytes() };
+    BigEndianInputBitStream streaminfo_data { MaybeOwned<AK::Stream>(streaminfo_data_memory) };
 
     // 11.10 METADATA_BLOCK_STREAMINFO
     m_min_block_size = LOADER_TRY(streaminfo_data.read_bits<u16>(16));
@@ -149,8 +149,8 @@ MaybeLoaderError FlacLoaderPlugin::parse_header()
 // 11.19. METADATA_BLOCK_PICTURE
 MaybeLoaderError FlacLoaderPlugin::load_picture(FlacRawMetadataBlock& block)
 {
-    auto memory_stream = LOADER_TRY(FixedMemoryStream::construct(block.data.bytes()));
-    BigEndianInputBitStream picture_block_bytes { MaybeOwned<AK::Stream>(*memory_stream) };
+    FixedMemoryStream memory_stream { block.data.bytes() };
+    BigEndianInputBitStream picture_block_bytes { MaybeOwned<AK::Stream>(memory_stream) };
 
     PictureData picture {};
 
@@ -158,13 +158,13 @@ MaybeLoaderError FlacLoaderPlugin::load_picture(FlacRawMetadataBlock& block)
 
     auto const mime_string_length = LOADER_TRY(picture_block_bytes.read_bits(32));
     // Note: We are seeking before reading the value to ensure that we stayed inside buffer's size.
-    auto offset_before_seeking = memory_stream->offset();
-    LOADER_TRY(memory_stream->seek(mime_string_length, SeekMode::FromCurrentPosition));
+    auto offset_before_seeking = memory_stream.offset();
+    LOADER_TRY(memory_stream.seek(mime_string_length, SeekMode::FromCurrentPosition));
     picture.mime_string = { block.data.bytes().data() + offset_before_seeking, (size_t)mime_string_length };
 
     auto const description_string_length = LOADER_TRY(picture_block_bytes.read_bits(32));
-    offset_before_seeking = memory_stream->offset();
-    LOADER_TRY(memory_stream->seek(description_string_length, SeekMode::FromCurrentPosition));
+    offset_before_seeking = memory_stream.offset();
+    LOADER_TRY(memory_stream.seek(description_string_length, SeekMode::FromCurrentPosition));
     picture.description_string = Vector<u32> { Span<u32> { reinterpret_cast<u32*>(block.data.bytes().data() + offset_before_seeking), (size_t)description_string_length } };
 
     picture.width = LOADER_TRY(picture_block_bytes.read_bits(32));
@@ -174,8 +174,8 @@ MaybeLoaderError FlacLoaderPlugin::load_picture(FlacRawMetadataBlock& block)
     picture.colors = LOADER_TRY(picture_block_bytes.read_bits(32));
 
     auto const picture_size = LOADER_TRY(picture_block_bytes.read_bits(32));
-    offset_before_seeking = memory_stream->offset();
-    LOADER_TRY(memory_stream->seek(picture_size, SeekMode::FromCurrentPosition));
+    offset_before_seeking = memory_stream.offset();
+    LOADER_TRY(memory_stream.seek(picture_size, SeekMode::FromCurrentPosition));
     picture.data = Vector<u8> { Span<u8> { block.data.bytes().data() + offset_before_seeking, (size_t)picture_size } };
 
     m_pictures.append(move(picture));
@@ -186,8 +186,8 @@ MaybeLoaderError FlacLoaderPlugin::load_picture(FlacRawMetadataBlock& block)
 // 11.13. METADATA_BLOCK_SEEKTABLE
 MaybeLoaderError FlacLoaderPlugin::load_seektable(FlacRawMetadataBlock& block)
 {
-    auto memory_stream = LOADER_TRY(FixedMemoryStream::construct(block.data.bytes()));
-    BigEndianInputBitStream seektable_bytes { MaybeOwned<AK::Stream>(*memory_stream) };
+    FixedMemoryStream memory_stream { block.data.bytes() };
+    BigEndianInputBitStream seektable_bytes { MaybeOwned<AK::Stream>(memory_stream) };
     for (size_t i = 0; i < block.length / 18; ++i) {
         // 11.14. SEEKPOINT
         FlacSeekPoint seekpoint {
diff --git a/Userland/Libraries/LibAudio/MP3Loader.cpp b/Userland/Libraries/LibAudio/MP3Loader.cpp
index 693f680527..59a90cf233 100644
--- a/Userland/Libraries/LibAudio/MP3Loader.cpp
+++ b/Userland/Libraries/LibAudio/MP3Loader.cpp
@@ -31,7 +31,7 @@ Result<NonnullOwnPtr<MP3LoaderPlugin>, LoaderError> MP3LoaderPlugin::create(Stri
 
 Result<NonnullOwnPtr<MP3LoaderPlugin>, LoaderError> MP3LoaderPlugin::create(Bytes buffer)
 {
-    auto stream = LOADER_TRY(FixedMemoryStream::construct(buffer));
+    auto stream = LOADER_TRY(try_make<FixedMemoryStream>(buffer));
     auto loader = make<MP3LoaderPlugin>(move(stream));
 
     LOADER_TRY(loader->initialize());
diff --git a/Userland/Libraries/LibAudio/WavLoader.cpp b/Userland/Libraries/LibAudio/WavLoader.cpp
index 4fcff2ae88..f222cd4cfc 100644
--- a/Userland/Libraries/LibAudio/WavLoader.cpp
+++ b/Userland/Libraries/LibAudio/WavLoader.cpp
@@ -35,7 +35,7 @@ Result<NonnullOwnPtr<WavLoaderPlugin>, LoaderError> WavLoaderPlugin::create(Stri
 
 Result<NonnullOwnPtr<WavLoaderPlugin>, LoaderError> WavLoaderPlugin::create(Bytes buffer)
 {
-    auto stream = LOADER_TRY(FixedMemoryStream::construct(buffer));
+    auto stream = LOADER_TRY(try_make<FixedMemoryStream>(buffer));
     auto loader = make<WavLoaderPlugin>(move(stream));
 
     LOADER_TRY(loader->initialize());
@@ -115,23 +115,23 @@ static ErrorOr<double> read_sample(AK::Stream& stream)
 LoaderSamples WavLoaderPlugin::samples_from_pcm_data(Bytes const& data, size_t samples_to_read) const
 {
     FixedArray<Sample> samples = LOADER_TRY(FixedArray<Sample>::create(samples_to_read));
-    auto stream = LOADER_TRY(FixedMemoryStream::construct(move(data)));
+    FixedMemoryStream stream { data };
 
     switch (m_sample_format) {
     case PcmSampleFormat::Uint8:
-        TRY(read_samples_from_stream(*stream, read_sample<u8>, samples));
+        TRY(read_samples_from_stream(stream, read_sample<u8>, samples));
         break;
     case PcmSampleFormat::Int16:
-        TRY(read_samples_from_stream(*stream, read_sample<i16>, samples));
+        TRY(read_samples_from_stream(stream, read_sample<i16>, samples));
         break;
     case PcmSampleFormat::Int24:
-        TRY(read_samples_from_stream(*stream, read_sample_int24, samples));
+        TRY(read_samples_from_stream(stream, read_sample_int24, samples));
         break;
     case PcmSampleFormat::Float32:
-        TRY(read_samples_from_stream(*stream, read_sample<float>, samples));
+        TRY(read_samples_from_stream(stream, read_sample<float>, samples));
         break;
     case PcmSampleFormat::Float64:
-        TRY(read_samples_from_stream(*stream, read_sample<double>, samples));
+        TRY(read_samples_from_stream(stream, read_sample<double>, samples));
         break;
     default:
         VERIFY_NOT_REACHED();
diff --git a/Userland/Libraries/LibCompress/Deflate.cpp b/Userland/Libraries/LibCompress/Deflate.cpp
index f6c296635f..0dc24c55a1 100644
--- a/Userland/Libraries/LibCompress/Deflate.cpp
+++ b/Userland/Libraries/LibCompress/Deflate.cpp
@@ -317,7 +317,7 @@ void DeflateDecompressor::close()
 
 ErrorOr<ByteBuffer> DeflateDecompressor::decompress_all(ReadonlyBytes bytes)
 {
-    auto memory_stream = TRY(FixedMemoryStream::construct(bytes));
+    auto memory_stream = TRY(try_make<FixedMemoryStream>(bytes));
     auto deflate_stream = TRY(DeflateDecompressor::construct(move(memory_stream)));
     AllocatingMemoryStream output_stream;
 
diff --git a/Userland/Libraries/LibCompress/Gzip.cpp b/Userland/Libraries/LibCompress/Gzip.cpp
index 93208319d4..3fcb2adb22 100644
--- a/Userland/Libraries/LibCompress/Gzip.cpp
+++ b/Userland/Libraries/LibCompress/Gzip.cpp
@@ -164,7 +164,7 @@ Optional<DeprecatedString> GzipDecompressor::describe_header(ReadonlyBytes bytes
 
 ErrorOr<ByteBuffer> GzipDecompressor::decompress_all(ReadonlyBytes bytes)
 {
-    auto memory_stream = TRY(FixedMemoryStream::construct(bytes));
+    auto memory_stream = TRY(try_make<FixedMemoryStream>(bytes));
     auto gzip_stream = make<GzipDecompressor>(move(memory_stream));
     AllocatingMemoryStream output_stream;
 
diff --git a/Userland/Libraries/LibDebug/Dwarf/AbbreviationsMap.cpp b/Userland/Libraries/LibDebug/Dwarf/AbbreviationsMap.cpp
index e8c263ffa6..67f926a43e 100644
--- a/Userland/Libraries/LibDebug/Dwarf/AbbreviationsMap.cpp
+++ b/Userland/Libraries/LibDebug/Dwarf/AbbreviationsMap.cpp
@@ -21,19 +21,19 @@ AbbreviationsMap::AbbreviationsMap(DwarfInfo const& dwarf_info, u32 offset)
 
 ErrorOr<void> AbbreviationsMap::populate_map()
 {
-    auto abbreviation_stream = TRY(FixedMemoryStream::construct(m_dwarf_info.abbreviation_data()));
-    TRY(abbreviation_stream->discard(m_offset));
+    FixedMemoryStream abbreviation_stream { m_dwarf_info.abbreviation_data() };
+    TRY(abbreviation_stream.discard(m_offset));
 
-    while (!abbreviation_stream->is_eof()) {
-        size_t abbreviation_code = TRY(abbreviation_stream->read_value<LEB128<size_t>>());
+    while (!abbreviation_stream.is_eof()) {
+        size_t abbreviation_code = TRY(abbreviation_stream.read_value<LEB128<size_t>>());
         // An abbreviation code of 0 marks the end of the
         // abbreviations for a given compilation unit
         if (abbreviation_code == 0)
             break;
 
-        size_t tag = TRY(abbreviation_stream->read_value<LEB128<size_t>>());
+        size_t tag = TRY(abbreviation_stream.read_value<LEB128<size_t>>());
 
-        auto has_children = TRY(abbreviation_stream->read_value<u8>());
+        auto has_children = TRY(abbreviation_stream.read_value<u8>());
 
         AbbreviationEntry abbreviation_entry {};
         abbreviation_entry.tag = static_cast<EntryTag>(tag);
@@ -41,14 +41,14 @@ ErrorOr<void> AbbreviationsMap::populate_map()
 
         AttributeSpecification current_attribute_specification {};
         do {
-            size_t attribute_value = TRY(abbreviation_stream->read_value<LEB128<size_t>>());
-            size_t form_value = TRY(abbreviation_stream->read_value<LEB128<size_t>>());
+            size_t attribute_value = TRY(abbreviation_stream.read_value<LEB128<size_t>>());
+            size_t form_value = TRY(abbreviation_stream.read_value<LEB128<size_t>>());
 
             current_attribute_specification.attribute = static_cast<Attribute>(attribute_value);
             current_attribute_specification.form = static_cast<AttributeDataForm>(form_value);
 
             if (current_attribute_specification.form == AttributeDataForm::ImplicitConst) {
-                ssize_t data_value = TRY(abbreviation_stream->read_value<LEB128<ssize_t>>());
+                ssize_t data_value = TRY(abbreviation_stream.read_value<LEB128<ssize_t>>());
                 current_attribute_specification.value = data_value;
             }
 
diff --git a/Userland/Libraries/LibDebug/Dwarf/AddressRanges.h b/Userland/Libraries/LibDebug/Dwarf/AddressRanges.h
index 4f4a82985f..7849b9778d 100644
--- a/Userland/Libraries/LibDebug/Dwarf/AddressRanges.h
+++ b/Userland/Libraries/LibDebug/Dwarf/AddressRanges.h
@@ -24,6 +24,7 @@ class AddressRangesV5 {
     AK_MAKE_NONMOVABLE(AddressRangesV5);
 
 public:
+    // FIXME: This should be fine with using a non-owned stream.
     AddressRangesV5(NonnullOwnPtr<AK::Stream> range_lists_stream, CompilationUnit const& compilation_unit);
 
     ErrorOr<void> for_each_range(Function<void(Range)>);
diff --git a/Userland/Libraries/LibDebug/Dwarf/DIE.cpp b/Userland/Libraries/LibDebug/Dwarf/DIE.cpp
index a9e0cef979..2d2c5154c1 100644
--- a/Userland/Libraries/LibDebug/Dwarf/DIE.cpp
+++ b/Userland/Libraries/LibDebug/Dwarf/DIE.cpp
@@ -23,11 +23,11 @@ ErrorOr<void> DIE::rehydrate_from(u32 offset, Optional<u32> parent_offset)
 {
     m_offset = offset;
 
-    auto stream = TRY(FixedMemoryStream::construct(m_compilation_unit.dwarf_info().debug_info_data()));
+    FixedMemoryStream stream { m_compilation_unit.dwarf_info().debug_info_data() };
     // Note: We can't just slice away from the input data here, since get_attribute_value will try to recover the original offset using seek().
-    TRY(stream->seek(m_offset));
-    m_abbreviation_code = TRY(stream->read_value<LEB128<size_t>>());
-    m_data_offset = TRY(stream->tell());
+    TRY(stream.seek(m_offset));
+    m_abbreviation_code = TRY(stream.read_value<LEB128<size_t>>());
+    m_data_offset = TRY(stream.tell());
 
     if (m_abbreviation_code == 0) {
         // An abbreviation code of 0 ( = null DIE entry) means the end of a chain of siblings
@@ -41,25 +41,25 @@ ErrorOr<void> DIE::rehydrate_from(u32 offset, Optional<u32> parent_offset)
 
         // We iterate the attributes data only to calculate this DIE's size
         for (auto& attribute_spec : abbreviation_info->attribute_specifications) {
-            TRY(m_compilation_unit.dwarf_info().get_attribute_value(attribute_spec.form, attribute_spec.value, *stream, &m_compilation_unit));
+            TRY(m_compilation_unit.dwarf_info().get_attribute_value(attribute_spec.form, attribute_spec.value, stream, &m_compilation_unit));
         }
     }
-    m_size = TRY(stream->tell()) - m_offset;
+    m_size = TRY(stream.tell()) - m_offset;
     m_parent_offset = parent_offset;
     return {};
 }
 
 ErrorOr<Optional<AttributeValue>> DIE::get_attribute(Attribute const& attribute) const
 {
-    auto stream = TRY(FixedMemoryStream::construct(m_compilation_unit.dwarf_info().debug_info_data()));
+    FixedMemoryStream stream { m_compilation_unit.dwarf_info().debug_info_data() };
     // Note: We can't just slice away from the input data here, since get_attribute_value will try to recover the original offset using seek().
-    TRY(stream->seek(m_data_offset));
+    TRY(stream.seek(m_data_offset));
 
     auto abbreviation_info = m_compilation_unit.abbreviations_map().get(m_abbreviation_code);
     VERIFY(abbreviation_info);
 
     for (auto const& attribute_spec : abbreviation_info->attribute_specifications) {
-        auto value = TRY(m_compilation_unit.dwarf_info().get_attribute_value(attribute_spec.form, attribute_spec.value, *stream, &m_compilation_unit));
+        auto value = TRY(m_compilation_unit.dwarf_info().get_attribute_value(attribute_spec.form, attribute_spec.value, stream, &m_compilation_unit));
         if (attribute_spec.attribute == attribute) {
             return value;
         }
diff --git a/Userland/Libraries/LibDebug/Dwarf/DwarfInfo.cpp b/Userland/Libraries/LibDebug/Dwarf/DwarfInfo.cpp
index b4b519cdaf..6d52ecf8b7 100644
--- a/Userland/Libraries/LibDebug/Dwarf/DwarfInfo.cpp
+++ b/Userland/Libraries/LibDebug/Dwarf/DwarfInfo.cpp
@@ -47,35 +47,35 @@ ErrorOr<void> DwarfInfo::populate_compilation_units()
     if (!m_debug_info_data.data())
         return {};
 
-    auto debug_info_stream = TRY(FixedMemoryStream::construct(m_debug_info_data));
-    auto line_info_stream = TRY(FixedMemoryStream::construct(m_debug_line_data));
+    FixedMemoryStream debug_info_stream { m_debug_info_data };
+    FixedMemoryStream line_info_stream { m_debug_line_data };
 
-    while (!debug_info_stream->is_eof()) {
-        auto unit_offset = TRY(debug_info_stream->tell());
+    while (!debug_info_stream.is_eof()) {
+        auto unit_offset = TRY(debug_info_stream.tell());
 
-        auto compilation_unit_header = TRY(debug_info_stream->read_value<CompilationUnitHeader>());
+        auto compilation_unit_header = TRY(debug_info_stream.read_value<CompilationUnitHeader>());
         VERIFY(compilation_unit_header.common.version <= 5);
         VERIFY(compilation_unit_header.address_size() == sizeof(FlatPtr));
 
         u32 length_after_header = compilation_unit_header.length() - (compilation_unit_header.header_size() - offsetof(CompilationUnitHeader, common.version));
 
-        auto line_program = make<LineProgram>(*this, *line_info_stream);
+        auto line_program = make<LineProgram>(*this, line_info_stream);
 
         // HACK: Clang generates line programs for embedded resource assembly files, but not compile units.
         // Meaning that for graphical applications, some line info data would be unread, triggering the assertion below.
         // As a fix, we don't create compilation units for line programs that come from resource files.
 #if defined(AK_COMPILER_CLANG)
         if (line_program->looks_like_embedded_resource()) {
-            TRY(debug_info_stream->seek(unit_offset));
+            TRY(debug_info_stream.seek(unit_offset));
         } else
 #endif
         {
             m_compilation_units.append(make<CompilationUnit>(*this, unit_offset, compilation_unit_header, move(line_program)));
-            TRY(debug_info_stream->discard(length_after_header));
+            TRY(debug_info_stream.discard(length_after_header));
         }
     }
 
-    VERIFY(line_info_stream->is_eof());
+    VERIFY(line_info_stream.is_eof());
     return {};
 }
 
@@ -300,14 +300,14 @@ ErrorOr<void> DwarfInfo::build_cached_dies() const
 
             Vector<DIERange> entries;
             if (die.compilation_unit().dwarf_version() == 5) {
-                auto range_lists_stream = TRY(FixedMemoryStream::construct(debug_range_lists_data()));
+                auto range_lists_stream = TRY(try_make<FixedMemoryStream>(debug_range_lists_data()));
                 TRY(range_lists_stream->seek(offset));
                 AddressRangesV5 address_ranges(move(range_lists_stream), die.compilation_unit());
                 TRY(address_ranges.for_each_range([&entries](auto range) {
                     entries.empend(range.start, range.end);
                 }));
             } else {
-                auto ranges_stream = TRY(FixedMemoryStream::construct(debug_ranges_data()));
+                auto ranges_stream = TRY(try_make<FixedMemoryStream>(debug_ranges_data()));
                 TRY(ranges_stream->seek(offset));
                 AddressRangesV4 address_ranges(move(ranges_stream), die.compilation_unit());
                 TRY(address_ranges.for_each_range([&entries](auto range) {
diff --git a/Userland/Libraries/LibDebug/Dwarf/Expression.cpp b/Userland/Libraries/LibDebug/Dwarf/Expression.cpp
index 373bf26940..30f45f6e4b 100644
--- a/Userland/Libraries/LibDebug/Dwarf/Expression.cpp
+++ b/Userland/Libraries/LibDebug/Dwarf/Expression.cpp
@@ -14,10 +14,10 @@ namespace Debug::Dwarf::Expression {
 
 ErrorOr<Value> evaluate(ReadonlyBytes bytes, [[maybe_unused]] PtraceRegisters const& regs)
 {
-    auto stream = TRY(FixedMemoryStream::construct(bytes));
+    FixedMemoryStream stream { bytes };
 
-    while (!stream->is_eof()) {
-        auto opcode = TRY(stream->read_value<u8>());
+    while (!stream.is_eof()) {
+        auto opcode = TRY(stream.read_value<u8>());
 
         switch (static_cast<Operations>(opcode)) {
 
diff --git a/Userland/Libraries/LibGfx/GIFLoader.cpp b/Userland/Libraries/LibGfx/GIFLoader.cpp
index 6535980ecf..dbf76239b1 100644
--- a/Userland/Libraries/LibGfx/GIFLoader.cpp
+++ b/Userland/Libraries/LibGfx/GIFLoader.cpp
@@ -381,21 +381,21 @@ static ErrorOr<void> load_gif_frame_descriptors(GIFLoadingContext& context)
     if (context.data_size < 32)
         return Error::from_string_literal("Size too short for GIF frame descriptors");
 
-    auto stream = TRY(FixedMemoryStream::construct(ReadonlyBytes { context.data, context.data_size }));
+    FixedMemoryStream stream { { context.data, context.data_size } };
 
-    TRY(decode_gif_header(*stream));
+    TRY(decode_gif_header(stream));
 
-    context.logical_screen.width = TRY(stream->read_value<LittleEndian<u16>>());
-    context.logical_screen.height = TRY(stream->read_value<LittleEndian<u16>>());
+    context.logical_screen.width = TRY(stream.read_value<LittleEndian<u16>>());
+    context.logical_screen.height = TRY(stream.read_value<LittleEndian<u16>>());
 
     if (context.logical_screen.width > maximum_width_for_decoded_images || context.logical_screen.height > maximum_height_for_decoded_images) {
         dbgln("This GIF is too large for comfort: {}x{}", context.logical_screen.width, context.logical_screen.height);
         return Error::from_string_literal("This GIF is too large for comfort");
     }
 
-    auto gcm_info = TRY(stream->read_value<u8>());
-    context.background_color_index = TRY(stream->read_value<u8>());
-    [[maybe_unused]] auto pixel_aspect_ratio = TRY(stream->read_value<u8>());
+    auto gcm_info = TRY(stream.read_value<u8>());
+    context.background_color_index = TRY(stream.read_value<u8>());
+    [[maybe_unused]] auto pixel_aspect_ratio = TRY(stream.read_value<u8>());
 
     u8 bits_per_pixel = (gcm_info & 7) + 1;
     int color_map_entry_count = 1;
@@ -403,29 +403,29 @@ static ErrorOr<void> load_gif_frame_descriptors(GIFLoadingContext& context)
         color_map_entry_count *= 2;
 
     for (int i = 0; i < color_map_entry_count; ++i) {
-        u8 r = TRY(stream->read_value<u8>());
-        u8 g = TRY(stream->read_value<u8>());
-        u8 b = TRY(stream->read_value<u8>());
+        u8 r = TRY(stream.read_value<u8>());
+        u8 g = TRY(stream.read_value<u8>());
+        u8 b = TRY(stream.read_value<u8>());
         context.logical_screen.color_map[i] = { r, g, b };
     }
 
     NonnullOwnPtr<GIFImageDescriptor> current_image = make<GIFImageDescriptor>();
     for (;;) {
-        u8 sentinel = TRY(stream->read_value<u8>());
+        u8 sentinel = TRY(stream.read_value<u8>());
 
         if (sentinel == '!') {
-            u8 extension_type = TRY(stream->read_value<u8>());
+            u8 extension_type = TRY(stream.read_value<u8>());
 
             u8 sub_block_length = 0;
 
             Vector<u8> sub_block {};
             for (;;) {
-                sub_block_length = TRY(stream->read_value<u8>());
+                sub_block_length = TRY(stream.read_value<u8>());
                 if (sub_block_length == 0)
                     break;
 
                 TRY(sub_block.try_resize(sub_block.size() + sub_block_length));
-                TRY(stream->read_entire_buffer(sub_block.span().slice_from_end(sub_block_length)));
+                TRY(stream.read_entire_buffer(sub_block.span().slice_from_end(sub_block_length)));
             }
 
             if (extension_type == 0xF9) {
@@ -471,12 +471,12 @@ static ErrorOr<void> load_gif_frame_descriptors(GIFLoadingContext& context)
             context.images.append(move(current_image));
             auto& image = context.images.last();
 
-            image.x = TRY(stream->read_value<LittleEndian<u16>>());
-            image.y = TRY(stream->read_value<LittleEndian<u16>>());
-            image.width = TRY(stream->read_value<LittleEndian<u16>>());
-            image.height = TRY(stream->read_value<LittleEndian<u16>>());
+            image.x = TRY(stream.read_value<LittleEndian<u16>>());
+            image.y = TRY(stream.read_value<LittleEndian<u16>>());
+            image.width = TRY(stream.read_value<LittleEndian<u16>>());
+            image.height = TRY(stream.read_value<LittleEndian<u16>>());
 
-            auto packed_fields = TRY(stream->read_value<u8>());
+            auto packed_fields = TRY(stream.read_value<u8>());
 
             image.use_global_color_map = !(packed_fields & 0x80);
             image.interlaced = (packed_fields & 0x40) != 0;
@@ -485,24 +485,24 @@ static ErrorOr<void> load_gif_frame_descriptors(GIFLoadingContext& context)
                 size_t local_color_table_size = AK::exp2<size_t>((packed_fields & 7) + 1);
 
                 for (size_t i = 0; i < local_color_table_size; ++i) {
-                    u8 r = TRY(stream->read_value<u8>());
-                    u8 g = TRY(stream->read_value<u8>());
-                    u8 b = TRY(stream->read_value<u8>());
+                    u8 r = TRY(stream.read_value<u8>());
+                    u8 g = TRY(stream.read_value<u8>());
+                    u8 b = TRY(stream.read_value<u8>());
                     image.color_map[i] = { r, g, b };
                 }
             }
 
-            image.lzw_min_code_size = TRY(stream->read_value<u8>());
+            image.lzw_min_code_size = TRY(stream.read_value<u8>());
 
             u8 lzw_encoded_bytes_expected = 0;
 
             for (;;) {
-                lzw_encoded_bytes_expected = TRY(stream->read_value<u8>());
+                lzw_encoded_bytes_expected = TRY(stream.read_value<u8>());
                 if (lzw_encoded_bytes_expected == 0)
                     break;
 
                 Array<u8, 256> buffer;
-                TRY(stream->read_entire_buffer(buffer.span().trim(lzw_encoded_bytes_expected)));
+                TRY(stream.read_entire_buffer(buffer.span().trim(lzw_encoded_bytes_expected)));
 
                 for (int i = 0; i < lzw_encoded_bytes_expected; ++i) {
                     image.lzw_encoded_bytes.append(buffer[i]);
@@ -565,16 +565,14 @@ bool GIFImageDecoderPlugin::set_nonvolatile(bool& was_purged)
 
 bool GIFImageDecoderPlugin::initialize()
 {
-    auto stream_or_error = FixedMemoryStream::construct(ReadonlyBytes { m_context->data, m_context->data_size });
-    if (stream_or_error.is_error())
-        return false;
-    return !decode_gif_header(*stream_or_error.value()).is_error();
+    FixedMemoryStream stream { { m_context->data, m_context->data_size } };
+    return !decode_gif_header(stream).is_error();
 }
 
 ErrorOr<bool> GIFImageDecoderPlugin::sniff(ReadonlyBytes data)
 {
-    auto stream = TRY(FixedMemoryStream::construct(data));
-    return !decode_gif_header(*stream).is_error();
+    FixedMemoryStream stream { data };
+    return !decode_gif_header(stream).is_error();
 }
 
 ErrorOr<NonnullOwnPtr<ImageDecoderPlugin>> GIFImageDecoderPlugin::create(ReadonlyBytes data)
diff --git a/Userland/Libraries/LibGfx/ICOLoader.cpp b/Userland/Libraries/LibGfx/ICOLoader.cpp
index 9007d06a90..ad4fcb5edf 100644
--- a/Userland/Libraries/LibGfx/ICOLoader.cpp
+++ b/Userland/Libraries/LibGfx/ICOLoader.cpp
@@ -116,14 +116,14 @@ static size_t find_largest_image(ICOLoadingContext const& context)
 
 static ErrorOr<void> load_ico_directory(ICOLoadingContext& context)
 {
-    auto stream = TRY(FixedMemoryStream::construct({ context.data, context.data_size }));
+    FixedMemoryStream stream { { context.data, context.data_size } };
 
-    auto image_count = TRY(decode_ico_header(*stream));
+    auto image_count = TRY(decode_ico_header(stream));
     if (image_count == 0)
         return Error::from_string_literal("ICO file has no images");
 
     for (size_t i = 0; i < image_count; ++i) {
-        auto desc = TRY(decode_ico_direntry(*stream));
+        auto desc = TRY(decode_ico_direntry(stream));
         if (desc.offset + desc.size < desc.offset // detect integer overflow
             || (desc.offset + desc.size) > context.data_size) {
             dbgln_if(ICO_DEBUG, "load_ico_directory: offset: {} size: {} doesn't fit in ICO size: {}", desc.offset, desc.size, context.data_size);
@@ -183,8 +183,8 @@ ErrorOr<void> ICOImageDecoderPlugin::load_ico_bitmap(ICOLoadingContext& context,
 
 ErrorOr<bool> ICOImageDecoderPlugin::sniff(ReadonlyBytes data)
 {
-    auto stream = TRY(FixedMemoryStream::construct(data));
-    return !decode_ico_header(*stream).is_error();
+    FixedMemoryStream stream { data };
+    return !decode_ico_header(stream).is_error();
 }
 
 ErrorOr<NonnullOwnPtr<ImageDecoderPlugin>> ICOImageDecoderPlugin::create(ReadonlyBytes data)
@@ -233,10 +233,8 @@ bool ICOImageDecoderPlugin::set_nonvolatile(bool& was_purged)
 
 bool ICOImageDecoderPlugin::initialize()
 {
-    auto stream_or_error = FixedMemoryStream::construct(ReadonlyBytes { m_context->data, m_context->data_size });
-    if (stream_or_error.is_error())
-        return false;
-    return !decode_ico_header(*stream_or_error.value()).is_error();
+    FixedMemoryStream stream { { m_context->data, m_context->data_size } };
+    return !decode_ico_header(stream).is_error();
 }
 
 bool ICOImageDecoderPlugin::is_animated()
diff --git a/Userland/Libraries/LibGfx/JPGLoader.cpp b/Userland/Libraries/LibGfx/JPGLoader.cpp
index 8f67d4f746..3fe1d8f297 100644
--- a/Userland/Libraries/LibGfx/JPGLoader.cpp
+++ b/Userland/Libraries/LibGfx/JPGLoader.cpp
@@ -1202,7 +1202,7 @@ static ErrorOr<void> scan_huffman_stream(AK::SeekableStream& stream, JPGLoadingC
 static ErrorOr<void> decode_header(JPGLoadingContext& context)
 {
     if (context.state < JPGLoadingContext::State::HeaderDecoded) {
-        context.stream = TRY(FixedMemoryStream::construct({ context.data, context.data_size }));
+        context.stream = TRY(try_make<FixedMemoryStream>(ReadonlyBytes { context.data, context.data_size }));
 
         if (auto result = parse_header(*context.stream, context); result.is_error()) {
             context.state = JPGLoadingContext::State::Error;
diff --git a/Userland/Libraries/LibGfx/QOILoader.cpp b/Userland/Libraries/LibGfx/QOILoader.cpp
index 0ecbed76cf..0f633d567c 100644
--- a/Userland/Libraries/LibGfx/QOILoader.cpp
+++ b/Userland/Libraries/LibGfx/QOILoader.cpp
@@ -202,13 +202,13 @@ bool QOIImageDecoderPlugin::initialize()
 
 ErrorOr<bool> QOIImageDecoderPlugin::sniff(ReadonlyBytes data)
 {
-    auto stream = TRY(FixedMemoryStream::construct({ data.data(), data.size() }));
-    return !decode_qoi_header(*stream).is_error();
+    FixedMemoryStream stream { { data.data(), data.size() } };
+    return !decode_qoi_header(stream).is_error();
 }
 
 ErrorOr<NonnullOwnPtr<ImageDecoderPlugin>> QOIImageDecoderPlugin::create(ReadonlyBytes data)
 {
-    auto stream = TRY(FixedMemoryStream::construct(data));
+    auto stream = TRY(try_make<FixedMemoryStream>(data));
     return adopt_nonnull_own_or_enomem(new (nothrow) QOIImageDecoderPlugin(move(stream)));
 }
 
diff --git a/Userland/Libraries/LibHTTP/Job.cpp b/Userland/Libraries/LibHTTP/Job.cpp
index 4ae7724a9d..a15e8ddb90 100644
--- a/Userland/Libraries/LibHTTP/Job.cpp
+++ b/Userland/Libraries/LibHTTP/Job.cpp
@@ -70,8 +70,8 @@ static ErrorOr<ByteBuffer> handle_content_encoding(ByteBuffer const& buf, Deprec
     } else if (content_encoding == "br") {
         dbgln_if(JOB_DEBUG, "Job::handle_content_encoding: buf is brotli compressed!");
 
-        auto bufstream = TRY(FixedMemoryStream::construct({ buf.data(), buf.size() }));
-        auto brotli_stream = Compress::BrotliDecompressionStream { *bufstream };
+        FixedMemoryStream bufstream { buf };
+        auto brotli_stream = Compress::BrotliDecompressionStream { bufstream };
 
         auto uncompressed = TRY(brotli_stream.read_until_eof());
         if constexpr (JOB_DEBUG) {
diff --git a/Userland/Libraries/LibPDF/DocumentParser.cpp b/Userland/Libraries/LibPDF/DocumentParser.cpp
index 08ab129847..2b55aea802 100644
--- a/Userland/Libraries/LibPDF/DocumentParser.cpp
+++ b/Userland/Libraries/LibPDF/DocumentParser.cpp
@@ -596,7 +596,7 @@ PDFErrorOr<DocumentParser::PageOffsetHintTable> DocumentParser::parse_page_offse
 
 PDFErrorOr<Vector<DocumentParser::PageOffsetHintTableEntry>> DocumentParser::parse_all_page_offset_hint_table_entries(PageOffsetHintTable const& hint_table, ReadonlyBytes hint_stream_bytes)
 {
-    auto input_stream = TRY(FixedMemoryStream::construct(hint_stream_bytes));
+    auto input_stream = TRY(try_make<FixedMemoryStream>(hint_stream_bytes));
     TRY(input_stream->seek(sizeof(PageOffsetHintTable)));
 
     LittleEndianInputBitStream bit_stream { move(input_stream) };
diff --git a/Userland/Libraries/LibWasm/AbstractMachine/BytecodeInterpreter.cpp b/Userland/Libraries/LibWasm/AbstractMachine/BytecodeInterpreter.cpp
index 2a2856e472..a1c383aa8e 100644
--- a/Userland/Libraries/LibWasm/AbstractMachine/BytecodeInterpreter.cpp
+++ b/Userland/Libraries/LibWasm/AbstractMachine/BytecodeInterpreter.cpp
@@ -203,8 +203,8 @@ struct ConvertToRaw<float> {
     {
         LittleEndian<u32> res;
         ReadonlyBytes bytes { &value, sizeof(float) };
-        auto stream = FixedMemoryStream::construct(bytes).release_value_but_fixme_should_propagate_errors();
-        stream->read_entire_buffer(res.bytes()).release_value_but_fixme_should_propagate_errors();
+        FixedMemoryStream stream { bytes };
+        stream.read_entire_buffer(res.bytes()).release_value_but_fixme_should_propagate_errors();
         return static_cast<u32>(res);
     }
 };
@@ -215,8 +215,8 @@ struct ConvertToRaw<double> {
     {
         LittleEndian<u64> res;
         ReadonlyBytes bytes { &value, sizeof(double) };
-        auto stream = FixedMemoryStream::construct(bytes).release_value_but_fixme_should_propagate_errors();
-        stream->read_entire_buffer(res.bytes()).release_value_but_fixme_should_propagate_errors();
+        FixedMemoryStream stream { bytes };
+        stream.read_entire_buffer(res.bytes()).release_value_but_fixme_should_propagate_errors();
         return static_cast<u64>(res);
     }
 };
@@ -253,8 +253,8 @@ template<typename T>
 T BytecodeInterpreter::read_value(ReadonlyBytes data)
 {
     LittleEndian<T> value;
-    auto stream = FixedMemoryStream::construct(data).release_value_but_fixme_should_propagate_errors();
-    auto maybe_error = stream->read_entire_buffer(value.bytes());
+    FixedMemoryStream stream { data };
+    auto maybe_error = stream.read_entire_buffer(value.bytes());
     if (maybe_error.is_error()) {
         dbgln("Read from {} failed", data.data());
         m_trap = Trap { "Read from memory failed" };
@@ -266,8 +266,8 @@ template<>
 float BytecodeInterpreter::read_value<float>(ReadonlyBytes data)
 {
     LittleEndian<u32> raw_value;
-    auto stream = FixedMemoryStream::construct(data).release_value_but_fixme_should_propagate_errors();
-    auto maybe_error = stream->read_entire_buffer(raw_value.bytes());
+    FixedMemoryStream stream { data };
+    auto maybe_error = stream.read_entire_buffer(raw_value.bytes());
     if (maybe_error.is_error())
         m_trap = Trap { "Read from memory failed" };
     return bit_cast<float>(static_cast<u32>(raw_value));
@@ -277,8 +277,8 @@ template<>
 double BytecodeInterpreter::read_value<double>(ReadonlyBytes data)
 {
     LittleEndian<u64> raw_value;
-    auto stream = FixedMemoryStream::construct(data).release_value_but_fixme_should_propagate_errors();
-    auto maybe_error = stream->read_entire_buffer(raw_value.bytes());
+    FixedMemoryStream stream { data };
+    auto maybe_error = stream.read_entire_buffer(raw_value.bytes());
     if (maybe_error.is_error())
         m_trap = Trap { "Read from memory failed" };
     return bit_cast<double>(static_cast<u64>(raw_value));
diff --git a/Userland/Libraries/LibWasm/Parser/Parser.cpp b/Userland/Libraries/LibWasm/Parser/Parser.cpp
index 51f72d99e1..42282fb7bd 100644
--- a/Userland/Libraries/LibWasm/Parser/Parser.cpp
+++ b/Userland/Libraries/LibWasm/Parser/Parser.cpp
@@ -260,8 +260,8 @@ ParseResult<BlockType> BlockType::parse(AK::Stream& stream)
         return BlockType {};
 
     {
-        auto value_stream = FixedMemoryStream::construct(ReadonlyBytes { &kind, 1 }).release_value_but_fixme_should_propagate_errors();
-        if (auto value_type = ValueType::parse(*value_stream); !value_type.is_error())
+        FixedMemoryStream value_stream { ReadonlyBytes { &kind, 1 } };
+        if (auto value_type = ValueType::parse(value_stream); !value_type.is_error())
             return BlockType { value_type.release_value() };
     }
 
diff --git a/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyObject.cpp b/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyObject.cpp
index bf6dc243ae..7d6ad22390 100644
--- a/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyObject.cpp
+++ b/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyObject.cpp
@@ -121,8 +121,8 @@ JS::ThrowCompletionOr<size_t> parse_module(JS::VM& vm, JS::Object* buffer_object
     } else {
         return vm.throw_completion<JS::TypeError>("Not a BufferSource");
     }
-    auto stream = FixedMemoryStream::construct(data).release_value_but_fixme_should_propagate_errors();
-    auto module_result = Wasm::Module::parse(*stream);
+    FixedMemoryStream stream { data };
+    auto module_result = Wasm::Module::parse(stream);
     if (module_result.is_error()) {
         // FIXME: Throw CompileError instead.
         return vm.throw_completion<JS::TypeError>(Wasm::parse_error_to_deprecated_string(module_result.error()));
diff --git a/Userland/Services/WebServer/Client.cpp b/Userland/Services/WebServer/Client.cpp
index 269582af5f..beb497438b 100644
--- a/Userland/Services/WebServer/Client.cpp
+++ b/Userland/Services/WebServer/Client.cpp
@@ -336,8 +336,8 @@ ErrorOr<void> Client::handle_directory_listing(String const& requested_path, Str
     builder.append("</html>\n"sv);
 
     auto response = builder.to_deprecated_string();
-    auto stream = TRY(FixedMemoryStream::construct(response.bytes()));
-    return send_response(*stream, request, { .type = TRY(String::from_utf8("text/html"sv)), .length = response.length() });
+    FixedMemoryStream stream { response.bytes() };
+    return send_response(stream, request, { .type = TRY(String::from_utf8("text/html"sv)), .length = response.length() });
 }
 
 ErrorOr<void> Client::send_error_response(unsigned code, HTTP::HttpRequest const& request, Vector<String> const& headers)
diff --git a/Userland/Utilities/headless-browser.cpp b/Userland/Utilities/headless-browser.cpp
index 2e339890e3..fb0e2df08b 100644
--- a/Userland/Utilities/headless-browser.cpp
+++ b/Userland/Utilities/headless-browser.cpp
@@ -342,7 +342,7 @@ public:
     private:
         HTTPHeadlessRequest(HTTP::HttpRequest&& request, NonnullOwnPtr<Core::Stream::BufferedSocketBase> socket, ByteBuffer&& stream_backing_buffer)
             : m_stream_backing_buffer(move(stream_backing_buffer))
-            , m_output_stream(FixedMemoryStream::construct(m_stream_backing_buffer.bytes()).release_value_but_fixme_should_propagate_errors())
+            , m_output_stream(try_make<FixedMemoryStream>(m_stream_backing_buffer.bytes()).release_value_but_fixme_should_propagate_errors())
             , m_socket(move(socket))
             , m_job(HTTP::Job::construct(move(request), *m_output_stream))
         {
@@ -421,7 +421,7 @@ public:
     private:
         HTTPSHeadlessRequest(HTTP::HttpRequest&& request, NonnullOwnPtr<Core::Stream::BufferedSocketBase> socket, ByteBuffer&& stream_backing_buffer)
             : m_stream_backing_buffer(move(stream_backing_buffer))
-            , m_output_stream(FixedMemoryStream::construct(m_stream_backing_buffer.bytes()).release_value_but_fixme_should_propagate_errors())
+            , m_output_stream(try_make<FixedMemoryStream>(m_stream_backing_buffer.bytes()).release_value_but_fixme_should_propagate_errors())
             , m_socket(move(socket))
             , m_job(HTTP::HttpsJob::construct(move(request), *m_output_stream))
         {
@@ -490,7 +490,7 @@ public:
     private:
         GeminiHeadlessRequest(Gemini::GeminiRequest&& request, NonnullOwnPtr<Core::Stream::BufferedSocketBase> socket, ByteBuffer&& stream_backing_buffer)
             : m_stream_backing_buffer(move(stream_backing_buffer))
-            , m_output_stream(FixedMemoryStream::construct(m_stream_backing_buffer.bytes()).release_value_but_fixme_should_propagate_errors())
+            , m_output_stream(try_make<FixedMemoryStream>(m_stream_backing_buffer.bytes()).release_value_but_fixme_should_propagate_errors())
             , m_socket(move(socket))
             , m_job(Gemini::Job::construct(move(request), *m_output_stream))
         {
diff --git a/Userland/Utilities/wasm.cpp b/Userland/Utilities/wasm.cpp
index 0ec6e4ca76..ae368f5888 100644
--- a/Userland/Utilities/wasm.cpp
+++ b/Userland/Utilities/wasm.cpp
@@ -252,8 +252,8 @@ static Optional<Wasm::Module> parse(StringView filename)
         return {};
     }
 
-    auto stream = FixedMemoryStream::construct(ReadonlyBytes { result.value()->data(), result.value()->size() }).release_value_but_fixme_should_propagate_errors();
-    auto parse_result = Wasm::Module::parse(*stream);
+    FixedMemoryStream stream { ReadonlyBytes { result.value()->data(), result.value()->size() } };
+    auto parse_result = Wasm::Module::parse(stream);
     if (parse_result.is_error()) {
         warnln("Something went wrong, either the file is invalid, or there's a bug with LibWasm!");
         warnln("The parse error was {}", Wasm::parse_error_to_deprecated_string(parse_result.error()));