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AK: Use ErrorOr<T> for MappedFile factories

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Replace Result<T, E> with ErrorOr<T> and propagate the error to callers.
This commit is contained in:
Andreas Kling 2021-11-07 00:37:07 +01:00
parent c837bd551e
commit 0f5477c721
12 changed files with 54 additions and 64 deletions
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62
Userland/Libraries/LibGfx/TrueTypeFont/Font.cpp
View file

@ -7,6 +7,7 @@
#include <AK/Checked.h>
#include <AK/MappedFile.h>
#include <AK/Try.h>
#include <AK/Utf32View.h>
#include <AK/Utf8View.h>
#include <LibCore/File.h>
@ -224,52 +225,45 @@ GlyphHorizontalMetrics Hmtx::get_glyph_horizontal_metrics(u32 glyph_id) const
};
}
Result<NonnullRefPtr<Font>, String> Font::try_load_from_file(String path, unsigned index)
ErrorOr<NonnullRefPtr<Font>> Font::try_load_from_file(String path, unsigned index)
{
auto file_or_error = MappedFile::map(path);
if (file_or_error.is_error())
return String { file_or_error.error().string() };
auto& file = *file_or_error.value();
auto result = try_load_from_externally_owned_memory(file.bytes(), index);
if (result.is_error())
return result.error();
auto& font = *result.value();
font.m_mapped_file = file_or_error.release_value();
return result;
auto file = TRY(MappedFile::map(path));
auto font = TRY(try_load_from_externally_owned_memory(file->bytes(), index));
font->m_mapped_file = move(file);
return font;
}
Result<NonnullRefPtr<Font>, String> Font::try_load_from_externally_owned_memory(ReadonlyBytes buffer, unsigned index)
ErrorOr<NonnullRefPtr<Font>> Font::try_load_from_externally_owned_memory(ReadonlyBytes buffer, unsigned index)
{
if (buffer.size() < 4)
return String { "Font file too small" };
return Error::from_string_literal("Font file too small"sv);
u32 tag = be_u32(buffer.data());
if (tag == tag_from_str("ttcf")) {
// It's a font collection
if (buffer.size() < (u32)Sizes::TTCHeaderV1 + sizeof(u32) * (index + 1))
return String { "Font file too small" };
return Error::from_string_literal("Font file too small"sv);
u32 offset = be_u32(buffer.offset_pointer((u32)Sizes::TTCHeaderV1 + sizeof(u32) * index));
return try_load_from_offset(move(buffer), offset);
return try_load_from_offset(buffer, offset);
}
if (tag == tag_from_str("OTTO"))
return String { "CFF fonts not supported yet" };
return Error::from_string_literal("CFF fonts not supported yet"sv);
if (tag != 0x00010000)
return String { "Not a valid font" };
return Error::from_string_literal("Not a valid font"sv);
return try_load_from_offset(move(buffer), 0);
return try_load_from_offset(buffer, 0);
}
// FIXME: "loca" and "glyf" are not available for CFF fonts.
Result<NonnullRefPtr<Font>, String> Font::try_load_from_offset(ReadonlyBytes buffer, u32 offset)
ErrorOr<NonnullRefPtr<Font>> Font::try_load_from_offset(ReadonlyBytes buffer, u32 offset)
{
if (Checked<u32>::addition_would_overflow(offset, (u32)Sizes::OffsetTable))
return String { "Invalid offset in font header" };
return Error::from_string_literal("Invalid offset in font header"sv);
if (buffer.size() < offset + (u32)Sizes::OffsetTable)
return String { "Font file too small" };
return Error::from_string_literal("Font file too small"sv);
Optional<ReadonlyBytes> opt_head_slice = {};
Optional<ReadonlyBytes> opt_name_slice = {};
@ -292,7 +286,7 @@ Result<NonnullRefPtr<Font>, String> Font::try_load_from_offset(ReadonlyBytes buf
auto num_tables = be_u16(buffer.offset_pointer(offset + (u32)Offsets::NumTables));
if (buffer.size() < offset + (u32)Sizes::OffsetTable + num_tables * (u32)Sizes::TableRecord)
return String { "Font file too small" };
return Error::from_string_literal("Font file too small"sv);
for (auto i = 0; i < num_tables; i++) {
u32 record_offset = offset + (u32)Sizes::OffsetTable + i * (u32)Sizes::TableRecord;
@ -301,10 +295,10 @@ Result<NonnullRefPtr<Font>, String> Font::try_load_from_offset(ReadonlyBytes buf
u32 table_length = be_u32(buffer.offset_pointer(record_offset + (u32)Offsets::TableRecord_Length));
if (Checked<u32>::addition_would_overflow(table_offset, table_length))
return String { "Invalid table offset/length in font." };
return Error::from_string_literal("Invalid table offset/length in font."sv);
if (buffer.size() < table_offset + table_length)
return String { "Font file too small" };
return Error::from_string_literal("Font file too small"sv);
auto buffer_here = ReadonlyBytes(buffer.offset_pointer(table_offset), table_length);
@ -331,39 +325,39 @@ Result<NonnullRefPtr<Font>, String> Font::try_load_from_offset(ReadonlyBytes buf
}
if (!opt_head_slice.has_value() || !(opt_head = Head::from_slice(opt_head_slice.value())).has_value())
return String { "Could not load Head" };
return Error::from_string_literal("Could not load Head"sv);
auto head = opt_head.value();
if (!opt_name_slice.has_value() || !(opt_name = Name::from_slice(opt_name_slice.value())).has_value())
return String { "Could not load Name" };
return Error::from_string_literal("Could not load Name"sv);
auto name = opt_name.value();
if (!opt_hhea_slice.has_value() || !(opt_hhea = Hhea::from_slice(opt_hhea_slice.value())).has_value())
return String { "Could not load Hhea" };
return Error::from_string_literal("Could not load Hhea"sv);
auto hhea = opt_hhea.value();
if (!opt_maxp_slice.has_value() || !(opt_maxp = Maxp::from_slice(opt_maxp_slice.value())).has_value())
return String { "Could not load Maxp" };
return Error::from_string_literal("Could not load Maxp"sv);
auto maxp = opt_maxp.value();
if (!opt_hmtx_slice.has_value() || !(opt_hmtx = Hmtx::from_slice(opt_hmtx_slice.value(), maxp.num_glyphs(), hhea.number_of_h_metrics())).has_value())
return String { "Could not load Hmtx" };
return Error::from_string_literal("Could not load Hmtx"sv);
auto hmtx = opt_hmtx.value();
if (!opt_cmap_slice.has_value() || !(opt_cmap = Cmap::from_slice(opt_cmap_slice.value())).has_value())
return String { "Could not load Cmap" };
return Error::from_string_literal("Could not load Cmap"sv);
auto cmap = opt_cmap.value();
if (!opt_loca_slice.has_value() || !(opt_loca = Loca::from_slice(opt_loca_slice.value(), maxp.num_glyphs(), head.index_to_loc_format())).has_value())
return String { "Could not load Loca" };
return Error::from_string_literal("Could not load Loca"sv);
auto loca = opt_loca.value();
if (!opt_glyf_slice.has_value())
return String { "Could not load Glyf" };
return Error::from_string_literal("Could not load Glyf"sv);
auto glyf = Glyf(opt_glyf_slice.value());
if (!opt_os2_slice.has_value())
return String { "Could not load OS/2" };
return Error::from_string_literal("Could not load OS/2"sv);
auto os2 = OS2(opt_os2_slice.value());
// Select cmap table. FIXME: Do this better. Right now, just looks for platform "Windows"

6
Userland/Libraries/LibGfx/TrueTypeFont/Font.h
View file

@ -45,8 +45,8 @@ class Font : public RefCounted<Font> {
AK_MAKE_NONCOPYABLE(Font);
public:
static Result<NonnullRefPtr<Font>, String> try_load_from_file(String path, unsigned index = 0);
static Result<NonnullRefPtr<Font>, String> try_load_from_externally_owned_memory(ReadonlyBytes bytes, unsigned index = 0);
static ErrorOr<NonnullRefPtr<Font>> try_load_from_file(String path, unsigned index = 0);
static ErrorOr<NonnullRefPtr<Font>> try_load_from_externally_owned_memory(ReadonlyBytes bytes, unsigned index = 0);
ScaledFontMetrics metrics(float x_scale, float y_scale) const;
ScaledGlyphMetrics glyph_metrics(u32 glyph_id, float x_scale, float y_scale) const;
@ -71,7 +71,7 @@ private:
TableRecord = 16,
};
static Result<NonnullRefPtr<Font>, String> try_load_from_offset(ReadonlyBytes, unsigned index = 0);
static ErrorOr<NonnullRefPtr<Font>> try_load_from_offset(ReadonlyBytes, unsigned index = 0);
Font(ReadonlyBytes bytes, Head&& head, Name&& name, Hhea&& hhea, Maxp&& maxp, Hmtx&& hmtx, Cmap&& cmap, Loca&& loca, Glyf&& glyf, OS2&& os2)
: m_buffer(move(bytes))

2
Userland/Libraries/LibSymbolication/Symbolication.cpp
View file

@ -83,7 +83,7 @@ Optional<Symbol> symbolicate(String const& path, FlatPtr address, IncludeSourceP
if (!s_cache.contains(full_path)) {
auto mapped_file = MappedFile::map(full_path);
if (mapped_file.is_error()) {
dbgln("Failed to map {}: {}", full_path, mapped_file.error().string());
dbgln("Failed to map {}: {}", full_path, mapped_file.error());
s_cache.set(full_path, {});
return {};
}