ladybird/Userland/Libraries/LibTLS/TLSPacketBuilder.h
stelar7 ca6b8bfe7f LibTLS: Rename Version to ProtocolVersion
This matches the wording used in the TLS RFC
Also define GREASE values as specified in RFC8701
2023-04-14 12:32:04 +01:00

90 lines
2.3 KiB
C++

/*
* 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>
#include <LibTLS/Extensions.h>
namespace TLS {
class PacketBuilder {
public:
PacketBuilder(ContentType type, u16 version, size_t size_hint = 0xfdf)
: PacketBuilder(type, (ProtocolVersion)version, size_hint)
{
}
PacketBuilder(ContentType type, ProtocolVersion version, size_t size_hint = 0xfdf)
{
// FIXME: Handle possible OOM situation.
m_packet_data = ByteBuffer::create_uninitialized(size_hint + 16).release_value_but_fixme_should_propagate_errors();
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((u8 const*)&value, sizeof(value));
}
inline void append(u8 value)
{
append((u8 const*)&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(u8 const* 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.resize(m_current_length);
}
m_packet_data.overwrite(old_length, data, bytes);
}
inline ByteBuffer build()
{
auto length = m_current_length;
m_current_length = 0;
// FIXME: Propagate errors.
return MUST(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;
};
}