// Copyright © 2017-2020 Trust Wallet.

//

// This file is part of Trust. The full Trust copyright notice, including

// terms governing use, modification, and redistribution, is contained in the

// file LICENSE at the root of the source code distribution tree.

#pragma once

#include <cstddef>

#include <cstdint>

#include <vector>

namespace TW::Ripple {

enum class FieldType;

/// Encodes a field type.

inline void encodeType(FieldType type, int key, std::vector<uint8_t>& data) {

const auto typeValue = static_cast<int>(type);

if (key <= 0xf) {

data.push_back(static_cast<uint8_t>((typeValue << 4) | key));

} else {

data.push_back(static_cast<uint8_t>(typeValue << 4));

data.push_back(static_cast<uint8_t>(key));

}

}

/// Encodes a variable length.

inline void encodeVariableLength(size_t length, std::vector<uint8_t>& data) {

if (length <= 192) {

data.push_back(static_cast<unsigned char>(length));

} else if (length <= 12480) {

length -= 193;

data.push_back(static_cast<unsigned char>(length >> 8));

data.push_back(static_cast<unsigned char>(length & 0xff));

} else if (length <= 918744) {

length -= 12481;

data.push_back(static_cast<unsigned char>(length >> 16));

data.push_back(static_cast<unsigned char>((length >> 8) & 0xff));

data.push_back(static_cast<unsigned char>(length & 0xff));

}

}

/// Encodes a variable length bytes.

inline void encodeBytes(std::vector<uint8_t> bytes, std::vector<uint8_t>& data) {

encodeVariableLength(bytes.size(), data);

data.insert(data.end(), bytes.begin(), bytes.end());

}

} // namespace TW::Ripple