/*
 * Copyright (c) 2024-2024 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <vector>

#include "byte_buffer.h"
#include "byte_array_utils.h"
#include "signature_tools_log.h"
#include "sign_head.h"

namespace OHOS {
namespace SignatureTools {

const int SignHead::SIGN_HEAD_LEN = 32;
const std::string SignHead::MAGIC = "hw signed app   ";
const std::string SignHead::ELF_MAGIC = "elf sign block  ";
const std::string SignHead::VERSION = "1000";
const int SignHead::NUM_OF_BLOCK = 2;
const int SignHead::RESERVE_LENGTH = 4;
const int32_t SignHead::ELF_BLOCK_LEN = 12;
const int32_t SignHead::BIN_BLOCK_LEN = 8;
std::vector<int8_t> SignHead::m_reserve = std::vector<int8_t>(SignHead::RESERVE_LENGTH, 0);

SignHead::SignHead()
{
}

std::vector<int8_t> SignHead::GetSignHead(const int subBlockSize)
{
    int size = subBlockSize;
    std::vector<int8_t> signHead(SIGN_HEAD_LEN, 0);
    int start = 0;
    start = ByteArrayUtils::InsertCharToByteArray(signHead, start, MAGIC);
    if (start < 0) {
        PrintErrorNumberMsg("SIGN_ERROR", SIGN_ERROR, "InsertCharToByteArray failed.");
        return std::vector<int8_t>();
    }
    start = ByteArrayUtils::InsertCharToByteArray(signHead, start, VERSION);
    if (start < 0) {
        PrintErrorNumberMsg("SIGN_ERROR", SIGN_ERROR, "InsertCharToByteArray failed.");
        return std::vector<int8_t>();
    }
    start = ByteArrayUtils::InsertIntToByteArray(signHead, start, size);
    if (start < 0) {
        PrintErrorNumberMsg("SIGN_ERROR", SIGN_ERROR, "InsertIntToByteArray failed.");
        return std::vector<int8_t>();
    }
    start = ByteArrayUtils::InsertIntToByteArray(signHead, start, NUM_OF_BLOCK);
    if (start < 0) {
        PrintErrorNumberMsg("SIGN_ERROR", SIGN_ERROR, "InsertIntToByteArray failed.");
        return std::vector<int8_t>();
    }
    start = ByteArrayUtils::InsertCharToByteArray(signHead, start, std::string(m_reserve.begin(), m_reserve.end()));
    if (start < 0) {
        PrintErrorNumberMsg("SIGN_ERROR", SIGN_ERROR, "InsertCharToByteArray failed.");
        return std::vector<int8_t>();
    }
    return signHead;
}

std::vector<int8_t> SignHead::GetSignHeadLittleEndian(const int subBlockSize, const int subBlockNum)
{
    ByteBuffer bf = ByteBuffer(SignHead::SIGN_HEAD_LEN);
    for (char c : SignHead::ELF_MAGIC) {
        bf.PutByte(c);
    }
    for (char c : SignHead::VERSION) {
        bf.PutByte(c);
    }
    bf.PutInt32(subBlockSize);
    bf.PutInt32(subBlockNum);
    for (char c : SignHead::m_reserve) {
        bf.PutByte(c);
    }
    int8_t ret[SignHead::SIGN_HEAD_LEN];
    bf.GetData(0, ret, SignHead::SIGN_HEAD_LEN);
    std::vector<int8_t> byte(ret, ret + SignHead::SIGN_HEAD_LEN);

    return byte;
}

} // namespace SignatureTools
} // namespace OHOS