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/*
* Copyright (c) 2020, Sergey Bugaev <bugaevc@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/FileSystem/Plan9FS/FileSystem.h>
#include <Kernel/FileSystem/Plan9FS/Inode.h>
#include <Kernel/FileSystem/Plan9FS/Message.h>
namespace Kernel {
Plan9FSMessage& Plan9FSMessage::operator<<(u8 number)
{
return append_number(number);
}
Plan9FSMessage& Plan9FSMessage::operator<<(u16 number)
{
return append_number(number);
}
Plan9FSMessage& Plan9FSMessage::operator<<(u32 number)
{
return append_number(number);
}
Plan9FSMessage& Plan9FSMessage::operator<<(u64 number)
{
return append_number(number);
}
Plan9FSMessage& Plan9FSMessage::operator<<(StringView string)
{
*this << static_cast<u16>(string.length());
// FIXME: Handle append failure.
(void)m_builder.append(string);
return *this;
}
void Plan9FSMessage::append_data(StringView data)
{
*this << static_cast<u32>(data.length());
// FIXME: Handle append failure.
(void)m_builder.append(data);
}
Plan9FSMessage::Decoder& Plan9FSMessage::Decoder::operator>>(u8& number)
{
return read_number(number);
}
Plan9FSMessage::Decoder& Plan9FSMessage::Decoder::operator>>(u16& number)
{
return read_number(number);
}
Plan9FSMessage::Decoder& Plan9FSMessage::Decoder::operator>>(u32& number)
{
return read_number(number);
}
Plan9FSMessage::Decoder& Plan9FSMessage::Decoder::operator>>(u64& number)
{
return read_number(number);
}
Plan9FSMessage::Decoder& Plan9FSMessage::Decoder::operator>>(Plan9FSQIdentifier& qid)
{
return *this >> qid.type >> qid.version >> qid.path;
}
Plan9FSMessage::Decoder& Plan9FSMessage::Decoder::operator>>(StringView& string)
{
u16 length;
*this >> length;
VERIFY(length <= m_data.length());
string = m_data.substring_view(0, length);
m_data = m_data.substring_view_starting_after_substring(string);
return *this;
}
StringView Plan9FSMessage::Decoder::read_data()
{
u32 length;
*this >> length;
VERIFY(length <= m_data.length());
auto data = m_data.substring_view(0, length);
m_data = m_data.substring_view_starting_after_substring(data);
return data;
}
Plan9FSMessage::Plan9FSMessage(Plan9FS& fs, Type type)
: m_builder(KBufferBuilder::try_create().release_value()) // FIXME: Don't assume KBufferBuilder allocation success.
, m_tag(fs.allocate_tag())
, m_type(type)
, m_have_been_built(false)
{
u32 size_placeholder = 0;
*this << size_placeholder << (u8)type << m_tag;
}
Plan9FSMessage::Plan9FSMessage(NonnullOwnPtr<KBuffer>&& buffer)
: m_built { move(buffer), Decoder({ buffer->bytes() }) }
, m_have_been_built(true)
{
u32 size;
u8 raw_type;
*this >> size >> raw_type >> m_tag;
m_type = (Type)raw_type;
}
Plan9FSMessage::~Plan9FSMessage()
{
if (m_have_been_built) {
m_built.buffer.~NonnullOwnPtr<KBuffer>();
m_built.decoder.~Decoder();
} else {
m_builder.~KBufferBuilder();
}
}
Plan9FSMessage& Plan9FSMessage::operator=(Plan9FSMessage&& message)
{
m_tag = message.m_tag;
m_type = message.m_type;
if (m_have_been_built) {
m_built.buffer.~NonnullOwnPtr<KBuffer>();
m_built.decoder.~Decoder();
} else {
m_builder.~KBufferBuilder();
}
m_have_been_built = message.m_have_been_built;
if (m_have_been_built) {
new (&m_built.buffer) NonnullOwnPtr<KBuffer>(move(message.m_built.buffer));
new (&m_built.decoder) Decoder(move(message.m_built.decoder));
} else {
new (&m_builder) KBufferBuilder(move(message.m_builder));
}
return *this;
}
KBuffer const& Plan9FSMessage::build()
{
VERIFY(!m_have_been_built);
auto tmp_buffer = m_builder.build();
// FIXME: We should not assume success here.
VERIFY(tmp_buffer);
m_have_been_built = true;
m_builder.~KBufferBuilder();
new (&m_built.buffer) NonnullOwnPtr<KBuffer>(tmp_buffer.release_nonnull());
new (&m_built.decoder) Decoder({ m_built.buffer->data(), m_built.buffer->size() });
u32* size = reinterpret_cast<u32*>(m_built.buffer->data());
*size = m_built.buffer->size();
return *m_built.buffer;
}
}
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