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LibCompress: Implement the XZ BCJ filter for ARM64

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Tim Schumacher 2023-10-25 19:17:10 +02:00 • committed by Andrew Kaster
parent e2d4952f0f
commit a1cf2708ee
3 changed files with 336 additions and 4 deletions
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28
Userland/Libraries/LibCompress/Xz.h
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@ -99,6 +99,34 @@ struct [[gnu::packed]] XzFilterLzma2Properties {
};
static_assert(sizeof(XzFilterLzma2Properties) == 1);
// 5.3.2. Branch/Call/Jump Filters for Executables
struct [[gnu::packed]] XzFilterBCJProperties {
u32 start_offset;
};
static_assert(sizeof(XzFilterBCJProperties) == 4);
class XzFilterBCJArm64 : public Stream {
public:
static ErrorOr<NonnullOwnPtr<XzFilterBCJArm64>> create(MaybeOwned<Stream>, u32 start_offset);
virtual ErrorOr<Bytes> read_some(Bytes) override;
virtual ErrorOr<size_t> write_some(ReadonlyBytes) override;
virtual bool is_eof() const override;
virtual bool is_open() const override;
virtual void close() override;
private:
static constexpr size_t INSTRUCTION_ALIGNMENT = 4;
static constexpr size_t INSTRUCTION_SIZE = 4;
XzFilterBCJArm64(CountingStream, u32 start_offset, CircularBuffer input_buffer, CircularBuffer output_buffer);
CountingStream m_stream;
u32 m_start_offset;
CircularBuffer m_input_buffer;
CircularBuffer m_output_buffer;
};
// 5.3.3. Delta
struct [[gnu::packed]] XzFilterDeltaProperties {
u8 encoded_distance;