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/*
* Copyright (c) 2020, Ali Mohammad Pur <mpfard@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/ByteBuffer.h>
#include <AK/ByteReader.h>
#include <AK/Endian.h>
#include <AK/Types.h>
namespace TLS {
enum class MessageType : u8 {
ChangeCipher = 0x14,
Alert = 0x15,
Handshake = 0x16,
ApplicationData = 0x17,
};
enum class Version : u16 {
V10 = 0x0301,
V11 = 0x0302,
V12 = 0x0303,
V13 = 0x0304
};
class PacketBuilder {
public:
PacketBuilder(MessageType type, u16 version, size_t size_hint = 0xfdf)
: PacketBuilder(type, (Version)version, size_hint)
{
}
PacketBuilder(MessageType type, Version version, size_t size_hint = 0xfdf)
{
m_packet_data = ByteBuffer::create_uninitialized(size_hint + 16);
m_current_length = 5;
m_packet_data[0] = (u8)type;
ByteReader::store(m_packet_data.offset_pointer(1), AK::convert_between_host_and_network_endian((u16)version));
}
inline void append(u16 value)
{
value = AK::convert_between_host_and_network_endian(value);
append((const u8*)&value, sizeof(value));
}
inline void append(u8 value)
{
append((const u8*)&value, sizeof(value));
}
inline void append(ReadonlyBytes data)
{
append(data.data(), data.size());
}
inline void append_u24(u32 value)
{
u8 buf[3];
buf[0] = value / 0x10000;
value %= 0x10000;
buf[1] = value / 0x100;
value %= 0x100;
buf[2] = value;
append(buf, 3);
}
inline void append(const u8* data, size_t bytes)
{
if (bytes == 0)
return;
auto old_length = m_current_length;
m_current_length += bytes;
if (m_packet_data.size() < m_current_length) {
m_packet_data.grow(m_current_length);
}
m_packet_data.overwrite(old_length, data, bytes);
}
inline ByteBuffer build()
{
auto length = m_current_length;
m_current_length = 0;
return m_packet_data.slice(0, length);
}
inline void set(size_t offset, u8 value)
{
VERIFY(offset < m_current_length);
m_packet_data[offset] = value;
}
size_t length() const { return m_current_length; }
private:
ByteBuffer m_packet_data;
size_t m_current_length;
};
}
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