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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <cstddef>
#include <cstdint>
#include "absl/strings/string_view.h"
#include "quiche/quic/core/crypto/quic_random.h"
#include "quiche/quic/core/quic_types.h"
#include "quiche/quic/platform/api/quic_export.h"
#include "quiche/common/quiche_data_writer.h"
#include "quiche/common/quiche_endian.h"
namespace quic {
// This class provides facilities for packing QUIC data.
// The QuicDataWriter supports appending primitive values (int, string, etc)
// to a frame instance. The internal memory buffer is exposed as the "data"
// of the QuicDataWriter.
class QUIC_EXPORT_PRIVATE QuicDataWriter : public quiche::QuicheDataWriter {
// Creates a QuicDataWriter where |buffer| is not owned
// using NETWORK_BYTE_ORDER endianness.
QuicDataWriter(size_t size, char* buffer);
// Creates a QuicDataWriter where |buffer| is not owned
// using the specified endianness.
QuicDataWriter(size_t size, char* buffer, quiche::Endianness endianness);
QuicDataWriter(const QuicDataWriter&) = delete;
QuicDataWriter& operator=(const QuicDataWriter&) = delete;
// Methods for adding to the payload. These values are appended to the end
// of the QuicDataWriter payload.
// Write unsigned floating point corresponding to the value. Large values are
// clamped to the maximum representable (kUFloat16MaxValue). Values that can
// not be represented directly are rounded down.
bool WriteUFloat16(uint64_t value);
// Write connection ID to the payload.
bool WriteConnectionId(QuicConnectionId connection_id);
// Write 8-bit length followed by connection ID to the payload.
bool WriteLengthPrefixedConnectionId(QuicConnectionId connection_id);
// Write |length| random bytes generated by |random|.
bool WriteRandomBytes(QuicRandom* random, size_t length);
// Write |length| random bytes generated by |random|. This MUST NOT be used
// for any application that requires cryptographically-secure randomness.
bool WriteInsecureRandomBytes(QuicRandom* random, size_t length);
} // namespace quic