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/*
* Copyright (c) 2020, Sergey Bugaev <bugaevc@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Types.h>
#include <Kernel/FileSystem/Plan9FS/Definitions.h>
#include <Kernel/KBuffer.h>
#include <Kernel/KBufferBuilder.h>
namespace Kernel {
class Plan9FS;
class Plan9FSInode;
class Plan9FSMessage {
friend class Plan9FS;
friend class Plan9FSInode;
public:
enum class Type : u8 {
// 9P2000.L
Tlerror = 6,
Rlerror = 7,
Tstatfs = 8,
Rstatfs = 9,
Tlopen = 12,
Rlopen = 13,
Tlcreate = 14,
Rlcreate = 15,
Tsymlink = 16,
Rsymlink = 17,
Tmknod = 18,
Rmknod = 19,
Trename = 20,
Rrename = 21,
Treadlink = 22,
Rreadlink = 23,
Tgetattr = 24,
Rgetattr = 25,
Tsetattr = 26,
Rsetattr = 27,
Txattrwalk = 30,
Rxattrwalk = 31,
Txattrcreate = 32,
Rxattrcreate = 33,
Treaddir = 40,
Rreaddir = 41,
Tfsync = 50,
Rfsync = 51,
Tlock = 52,
Rlock = 53,
Tgetlock = 54,
Rgetlock = 55,
Tlink = 70,
Rlink = 71,
Tmkdir = 72,
Rmkdir = 73,
Trenameat = 74,
Rrenameat = 75,
Tunlinkat = 76,
Runlinkat = 77,
// 9P2000
Tversion = 100,
Rversion = 101,
Tauth = 102,
Rauth = 103,
Tattach = 104,
Rattach = 105,
Terror = 106,
Rerror = 107,
Tflush = 108,
Rflush = 109,
Twalk = 110,
Rwalk = 111,
Topen = 112,
Ropen = 113,
Tcreate = 114,
Rcreate = 115,
Tread = 116,
Rread = 117,
Twrite = 118,
Rwrite = 119,
Tclunk = 120,
Rclunk = 121,
Tremove = 122,
Rremove = 123,
Tstat = 124,
Rstat = 125,
Twstat = 126,
Rwstat = 127
};
class Decoder {
public:
explicit Decoder(StringView data)
: m_data(data)
{
}
Decoder& operator>>(u8&);
Decoder& operator>>(u16&);
Decoder& operator>>(u32&);
Decoder& operator>>(u64&);
Decoder& operator>>(StringView&);
Decoder& operator>>(Plan9FSQIdentifier&);
StringView read_data();
bool has_more_data() const { return !m_data.is_empty(); }
private:
StringView m_data;
template<typename N>
Decoder& read_number(N& number)
{
VERIFY(sizeof(number) <= m_data.length());
memcpy(&number, m_data.characters_without_null_termination(), sizeof(number));
m_data = m_data.substring_view(sizeof(number), m_data.length() - sizeof(number));
return *this;
}
};
Plan9FSMessage& operator<<(u8);
Plan9FSMessage& operator<<(u16);
Plan9FSMessage& operator<<(u32);
Plan9FSMessage& operator<<(u64);
Plan9FSMessage& operator<<(StringView);
ErrorOr<void> append_data(StringView);
template<typename T>
Plan9FSMessage& operator>>(T& t)
{
VERIFY(m_have_been_built);
m_built.decoder >> t;
return *this;
}
StringView read_data()
{
VERIFY(m_have_been_built);
return m_built.decoder.read_data();
}
Type type() const { return m_type; }
u16 tag() const { return m_tag; }
Plan9FSMessage(Plan9FS&, Type);
Plan9FSMessage(NonnullOwnPtr<KBuffer>&&);
~Plan9FSMessage();
Plan9FSMessage& operator=(Plan9FSMessage&&);
KBuffer const& build();
static constexpr size_t max_header_size = 24;
private:
template<typename N>
Plan9FSMessage& append_number(N number)
{
VERIFY(!m_have_been_built);
// FIXME: Handle append failure.
(void)m_builder.append(reinterpret_cast<char const*>(&number), sizeof(number));
return *this;
}
union {
KBufferBuilder m_builder;
struct {
NonnullOwnPtr<KBuffer> buffer;
Decoder decoder;
} m_built;
};
u16 m_tag { 0 };
Type m_type { 0 };
bool m_have_been_built { false };
};
}
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