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LibCompress: Port DeflateDecompressor to Core::Stream

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This commit is contained in:
Tim Schumacher 2022-12-02 22:01:44 +01:00 • committed by Linus Groh
parent f909cfbe75
commit 30abd47099
8 changed files with 129 additions and 196 deletions
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33
Userland/Libraries/LibCompress/Deflate.h
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@ -13,13 +13,15 @@
#include <AK/Endian.h>
#include <AK/Vector.h>
#include <LibCompress/DeflateTables.h>
#include <LibCore/InputBitStream.h>
#include <LibCore/Stream.h>
namespace Compress {
class CanonicalCode {
public:
CanonicalCode() = default;
u32 read_symbol(InputBitStream&) const;
ErrorOr<u32> read_symbol(Core::Stream::LittleEndianInputBitStream&) const;
void write_symbol(OutputBitStream&, u32) const;
static CanonicalCode const& fixed_literal_codes();
@ -37,13 +39,13 @@ private:
Array<u16, 288> m_bit_code_lengths {};
};
class DeflateDecompressor final : public InputStream {
class DeflateDecompressor final : public Core::Stream::Stream {
private:
class CompressedBlock {
public:
CompressedBlock(DeflateDecompressor&, CanonicalCode literal_codes, Optional<CanonicalCode> distance_codes);
bool try_read_more();
ErrorOr<bool> try_read_more();
private:
bool m_eof { false };
@ -57,7 +59,7 @@ private:
public:
UncompressedBlock(DeflateDecompressor&, size_t);
bool try_read_more();
ErrorOr<bool> try_read_more();
private:
DeflateDecompressor& m_decompressor;
@ -74,22 +76,21 @@ public:
friend CompressedBlock;
friend UncompressedBlock;
DeflateDecompressor(InputStream&);
DeflateDecompressor(Core::Stream::Handle<Core::Stream::Stream> stream);
~DeflateDecompressor();
size_t read(Bytes) override;
bool read_or_error(Bytes) override;
bool discard_or_error(size_t) override;
virtual ErrorOr<Bytes> read(Bytes) override;
virtual ErrorOr<size_t> write(ReadonlyBytes) override;
virtual bool is_eof() const override;
virtual bool is_open() const override;
virtual void close() override;
bool unreliable_eof() const override;
bool handle_any_error() override;
static Optional<ByteBuffer> decompress_all(ReadonlyBytes);
static ErrorOr<ByteBuffer> decompress_all(ReadonlyBytes);
private:
u32 decode_length(u32);
u32 decode_distance(u32);
void decode_codes(CanonicalCode& literal_code, Optional<CanonicalCode>& distance_code);
ErrorOr<u32> decode_length(u32);
ErrorOr<u32> decode_distance(u32);
ErrorOr<void> decode_codes(CanonicalCode& literal_code, Optional<CanonicalCode>& distance_code);
bool m_read_final_bock { false };
@ -99,7 +100,7 @@ private:
UncompressedBlock m_uncompressed_block;
};
InputBitStream m_input_stream;
Core::Stream::Handle<Core::Stream::LittleEndianInputBitStream> m_input_stream;
CircularDuplexStream<32 * KiB> m_output_stream;
};