ladybird/AK/Stream.h
Andreas Kling 5d180d1f99 Everywhere: Rename ASSERT => VERIFY
(...and ASSERT_NOT_REACHED => VERIFY_NOT_REACHED)

Since all of these checks are done in release builds as well,
let's rename them to VERIFY to prevent confusion, as everyone is
used to assertions being compiled out in release.

We can introduce a new ASSERT macro that is specifically for debug
checks, but I'm doing this wholesale conversion first since we've
accumulated thousands of these already, and it's not immediately
obvious which ones are suitable for ASSERT.
2021-02-23 20:56:54 +01:00

181 lines
5.5 KiB
C++

/*
* Copyright (c) 2020, the SerenityOS developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/Concepts.h>
#include <AK/Endian.h>
#include <AK/Forward.h>
#include <AK/Optional.h>
#include <AK/Span.h>
#include <AK/StdLibExtras.h>
namespace AK::Detail {
class Stream {
public:
virtual ~Stream() { VERIFY(!has_any_error()); }
virtual bool has_recoverable_error() const { return m_recoverable_error; }
virtual bool has_fatal_error() const { return m_fatal_error; }
virtual bool has_any_error() const { return has_recoverable_error() || has_fatal_error(); }
virtual bool handle_recoverable_error()
{
VERIFY(!has_fatal_error());
return exchange(m_recoverable_error, false);
}
virtual bool handle_fatal_error() { return exchange(m_fatal_error, false); }
virtual bool handle_any_error()
{
if (has_any_error()) {
m_recoverable_error = false;
m_fatal_error = false;
return true;
}
return false;
}
virtual void set_recoverable_error() const { m_recoverable_error = true; }
virtual void set_fatal_error() const { m_fatal_error = true; }
private:
mutable bool m_recoverable_error { false };
mutable bool m_fatal_error { false };
};
}
namespace AK {
class InputStream : public virtual AK::Detail::Stream {
public:
// Reads at least one byte unless none are requested or none are available. Does nothing
// and returns zero if there is already an error.
virtual size_t read(Bytes) = 0;
// If this function returns true, then no more data can be read. If read(Bytes) previously
// returned zero even though bytes were requested, then the inverse is true as well.
virtual bool unreliable_eof() const = 0;
// Some streams additionally define a method with the signature:
//
// bool eof() const;
//
// This method has the same semantics as unreliable_eof() but returns true if and only if no
// more data can be read. (A failed read is not necessary.)
virtual bool read_or_error(Bytes) = 0;
virtual bool discard_or_error(size_t count) = 0;
};
class OutputStream : public virtual AK::Detail::Stream {
public:
virtual size_t write(ReadonlyBytes) = 0;
virtual bool write_or_error(ReadonlyBytes) = 0;
};
class DuplexStream
: public InputStream
, public OutputStream {
};
inline InputStream& operator>>(InputStream& stream, Bytes bytes)
{
stream.read_or_error(bytes);
return stream;
}
inline OutputStream& operator<<(OutputStream& stream, ReadonlyBytes bytes)
{
stream.write_or_error(bytes);
return stream;
}
template<typename T>
InputStream& operator>>(InputStream& stream, LittleEndian<T>& value)
{
return stream >> Bytes { &value.m_value, sizeof(value.m_value) };
}
template<typename T>
OutputStream& operator<<(OutputStream& stream, LittleEndian<T> value)
{
return stream << ReadonlyBytes { &value.m_value, sizeof(value.m_value) };
}
template<typename T>
InputStream& operator>>(InputStream& stream, BigEndian<T>& value)
{
return stream >> Bytes { &value.m_value, sizeof(value.m_value) };
}
template<typename T>
OutputStream& operator<<(OutputStream& stream, BigEndian<T> value)
{
return stream << ReadonlyBytes { &value.m_value, sizeof(value.m_value) };
}
template<typename T>
InputStream& operator>>(InputStream& stream, Optional<T>& value)
{
T temporary;
stream >> temporary;
value = temporary;
return stream;
}
template<typename Integral>
InputStream& operator>>(InputStream& stream, Integral& value) requires IsIntegral<Integral>::value
{
stream.read_or_error({ &value, sizeof(value) });
return stream;
}
template<typename Integral>
OutputStream& operator<<(OutputStream& stream, Integral value) requires IsIntegral<Integral>::value
{
stream.write_or_error({ &value, sizeof(value) });
return stream;
}
#ifndef KERNEL
template<typename FloatingPoint>
InputStream& operator>>(InputStream& stream, FloatingPoint& value) requires IsFloatingPoint<FloatingPoint>::value
{
stream.read_or_error({ &value, sizeof(value) });
return stream;
}
template<typename FloatingPoint>
OutputStream& operator<<(OutputStream& stream, FloatingPoint value) requires IsFloatingPoint<FloatingPoint>::value
{
stream.write_or_error({ &value, sizeof(value) });
return stream;
}
#endif
}