AK: Remove `InputBitStream` and `OutputBitStream`

1 files changed, 0 insertions, 245 deletions

diff --git a/AK/BitStream.h b/AK/BitStream.h
deleted file mode 100644
index ec6a638e09..0000000000
--- a/AK/BitStream.h
+++ /dev/null
@@ -1,245 +0,0 @@
-/*
- * Copyright (c) 2020, the SerenityOS developers.
- * Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
-
-#pragma once
-
-#include <AK/Optional.h>
-#include <AK/Stream.h>
-
-namespace AK {
-
-// Obsoleted by LibCore/{Big, Little}EndianInputBitStream.
-class InputBitStream final : public InputStream {
-public:
-    explicit InputBitStream(InputStream& stream)
-        : m_stream(stream)
-    {
-    }
-
-    size_t read(Bytes bytes) override
-    {
-        if (has_any_error())
-            return 0;
-
-        size_t nread = 0;
-        if (bytes.size() >= 1) {
-            if (m_next_byte.has_value()) {
-                bytes[0] = m_next_byte.value();
-                m_next_byte.clear();
-
-                ++nread;
-            }
-        }
-
-        return nread + m_stream.read(bytes.slice(nread));
-    }
-
-    bool read_or_error(Bytes bytes) override
-    {
-        if (read(bytes) != bytes.size()) {
-            set_fatal_error();
-            return false;
-        }
-
-        return true;
-    }
-
-    [[nodiscard]] bool unreliable_eof() const override { return !m_next_byte.has_value() && m_stream.unreliable_eof(); }
-
-    bool discard_or_error(size_t count) override
-    {
-        if (count >= 1) {
-            if (m_next_byte.has_value()) {
-                m_next_byte.clear();
-                --count;
-            }
-        }
-
-        return m_stream.discard_or_error(count);
-    }
-
-    u64 read_bits(size_t count)
-    {
-        u64 result = 0;
-
-        size_t nread = 0;
-        while (nread < count) {
-            if (m_stream.has_any_error()) {
-                set_fatal_error();
-                return 0;
-            }
-
-            if (m_next_byte.has_value()) {
-                auto const bit = (m_next_byte.value() >> m_bit_offset) & 1;
-                result |= bit << nread;
-                ++nread;
-
-                if (m_bit_offset++ == 7)
-                    m_next_byte.clear();
-            } else {
-                m_stream >> m_next_byte;
-                m_bit_offset = 0;
-            }
-        }
-
-        return result;
-    }
-
-    u64 read_bits_big_endian(size_t count)
-    {
-        u64 result = 0;
-
-        size_t nread = 0;
-        while (nread < count) {
-            if (m_stream.has_any_error()) {
-                set_fatal_error();
-                return 0;
-            }
-
-            if (m_next_byte.has_value()) {
-                // read an entire byte
-                if (((count - nread) >= 8) && m_bit_offset == 0) {
-                    // shift existing bytes over
-                    result <<= 8;
-                    result |= m_next_byte.value();
-                    nread += 8;
-                    m_next_byte.clear();
-                } else {
-                    auto const bit = (m_next_byte.value() >> (7 - m_bit_offset)) & 1;
-                    result <<= 1;
-                    result |= bit;
-                    ++nread;
-                    if (m_bit_offset++ == 7)
-                        m_next_byte.clear();
-                }
-            } else {
-                m_stream >> m_next_byte;
-                m_bit_offset = 0;
-            }
-        }
-
-        return result;
-    }
-
-    bool read_bit() { return static_cast<bool>(read_bits(1)); }
-
-    bool read_bit_big_endian() { return static_cast<bool>(read_bits_big_endian(1)); }
-
-    void align_to_byte_boundary()
-    {
-        if (m_next_byte.has_value())
-            m_next_byte.clear();
-    }
-
-    bool handle_any_error() override
-    {
-        bool handled_errors = m_stream.handle_any_error();
-        return Stream::handle_any_error() || handled_errors;
-    }
-
-private:
-    Optional<u8> m_next_byte;
-    size_t m_bit_offset { 0 };
-    InputStream& m_stream;
-};
-
-class OutputBitStream final : public OutputStream {
-public:
-    explicit OutputBitStream(OutputStream& stream)
-        : m_stream(stream)
-    {
-    }
-
-    // WARNING: write aligns to the next byte boundary before writing, if unaligned writes are needed this should be rewritten
-    size_t write(ReadonlyBytes bytes) override
-    {
-        if (has_any_error())
-            return 0;
-        align_to_byte_boundary();
-        if (has_fatal_error()) // if align_to_byte_boundary failed
-            return 0;
-        return m_stream.write(bytes);
-    }
-
-    bool write_or_error(ReadonlyBytes bytes) override
-    {
-        if (write(bytes) < bytes.size()) {
-            set_fatal_error();
-            return false;
-        }
-        return true;
-    }
-
-    void write_bits(u32 bits, size_t count)
-    {
-        VERIFY(count <= 32);
-
-        if (count == 32 && !m_next_byte.has_value()) { // fast path for aligned 32 bit writes
-            m_stream << bits;
-            return;
-        }
-
-        size_t n_written = 0;
-        while (n_written < count) {
-            if (m_stream.has_any_error()) {
-                set_fatal_error();
-                return;
-            }
-
-            if (m_next_byte.has_value()) {
-                m_next_byte.value() |= ((bits >> n_written) & 1) << m_bit_offset;
-                ++n_written;
-
-                if (m_bit_offset++ == 7) {
-                    m_stream << m_next_byte.value();
-                    m_next_byte.clear();
-                }
-            } else if (count - n_written >= 16) { // fast path for aligned 16 bit writes
-                m_stream << (u16)((bits >> n_written) & 0xFFFF);
-                n_written += 16;
-            } else if (count - n_written >= 8) { // fast path for aligned 8 bit writes
-                m_stream << (u8)((bits >> n_written) & 0xFF);
-                n_written += 8;
-            } else {
-                m_bit_offset = 0;
-                m_next_byte = 0;
-            }
-        }
-    }
-
-    void write_bit(bool bit)
-    {
-        write_bits(bit, 1);
-    }
-
-    void align_to_byte_boundary()
-    {
-        if (m_next_byte.has_value()) {
-            if (!m_stream.write_or_error(ReadonlyBytes { &m_next_byte.value(), 1 })) {
-                set_fatal_error();
-            }
-            m_next_byte.clear();
-        }
-    }
-
-    [[nodiscard]] size_t bit_offset() const
-    {
-        return m_bit_offset;
-    }
-
-private:
-    Optional<u8> m_next_byte;
-    size_t m_bit_offset { 0 };
-    OutputStream& m_stream;
-};
-
-}
-
-#if USING_AK_GLOBALLY
-using AK::InputBitStream;
-using AK::OutputBitStream;
-#endif