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 Copyright (c) 2010-2012 cocos2d-x.org
 Copyright (c) 2013-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2022 Xiamen Yaji Software Co., Ltd.

 http://www.cocos.com

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated engine source code (the "Software"), a limited,
 worldwide, royalty-free, non-assignable, revocable and non-exclusive license
 to use Cocos Creator solely to develop games on your target platforms. You shall
 not use Cocos Creator software for developing other software or tools that's
 used for developing games. You are not granted to publish, distribute,
 sublicense, and/or sell copies of Cocos Creator.

 The software or tools in this License Agreement are licensed, not sold.
 Xiamen Yaji Software Co., Ltd. reserves all rights not expressly granted to you.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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****************************************************************************/

// IDEA: hack, must be included before ziputils
#include "base/ZipUtils.h"
#include "base/Log.h"

#include <mutex>

#ifdef MINIZIP_FROM_SYSTEM
    #include <minizip/unzip.h>
#else // from our embedded sources
    #include "unzip/unzip.h"
#endif

#include <memory>
#include "unzip/ioapi_mem.h"

#include <zlib.h>
#include <cassert>
#include <cstdlib>

#include <map>
#include "base/Data.h"
#include "base/Locked.h"
#include "platform/FileUtils.h"

// minizip 1.2.0 is same with other platforms
#ifndef unzGoToFirstFile64
    #define unzGoToFirstFile64(A, B, C, D) unzGoToFirstFile2(A, B, C, D, NULL, 0, NULL, 0) // NOLINT(readability-identifier-naming)
    #define unzGoToNextFile64(A, B, C, D)  unzGoToNextFile2(A, B, C, D, NULL, 0, NULL, 0)  // NOLINT(readability-identifier-naming)#endif
#endif

namespace cc {

unsigned int ZipUtils::encryptedPvrKeyParts[4] = {0, 0, 0, 0};
unsigned int ZipUtils::encryptionKey[1024];
bool         ZipUtils::encryptionKeyIsValid = false;

// --------------------- ZipUtils ---------------------

inline void ZipUtils::decodeEncodedPvr(unsigned int *data, ssize_t len) {
    const int enclen    = 1024;
    const int securelen = 512;
    const int distance  = 64;

    // check if key was set
    // make sure to call caw_setkey_part() for all 4 key parts
    CCASSERT(ZipUtils::encryptedPvrKeyParts[0] != 0, "ZipUtils: CCZ file is encrypted but key part 0 is not set. Did you call ZipUtils::setPvrEncryptionKeyPart(...)?");
    CCASSERT(ZipUtils::encryptedPvrKeyParts[1] != 0, "ZipUtils: CCZ file is encrypted but key part 1 is not set. Did you call ZipUtils::setPvrEncryptionKeyPart(...)?");
    CCASSERT(ZipUtils::encryptedPvrKeyParts[2] != 0, "ZipUtils: CCZ file is encrypted but key part 2 is not set. Did you call ZipUtils::setPvrEncryptionKeyPart(...)?");
    CCASSERT(ZipUtils::encryptedPvrKeyParts[3] != 0, "ZipUtils: CCZ file is encrypted but key part 3 is not set. Did you call ZipUtils::setPvrEncryptionKeyPart(...)?");

    // create long key
    if (!ZipUtils::encryptionKeyIsValid) {
        unsigned int y{0};
        unsigned int p{0};
        unsigned int e{0};
        unsigned int rounds = 6;
        unsigned int sum    = 0;
        unsigned int z      = ZipUtils::encryptionKey[enclen - 1];

        do {
#define DELTA 0x9e3779b9
#define MX    (((z >> 5 ^ y << 2) + (y >> 3 ^ z << 4)) ^ ((sum ^ y) + (ZipUtils::encryptedPvrKeyParts[(p & 3) ^ e] ^ z)))

            sum += DELTA;
            e = (sum >> 2) & 3;

            for (p = 0; p < enclen - 1; p++) {
                y = ZipUtils::encryptionKey[p + 1];
                z = ZipUtils::encryptionKey[p] += MX;
            }

            y = ZipUtils::encryptionKey[0];
            z = ZipUtils::encryptionKey[enclen - 1] += MX;

        } while (--rounds);

        ZipUtils::encryptionKeyIsValid = true;
    }

    int b = 0;
    int i = 0;

    // encrypt first part completely
    for (; i < len && i < securelen; i++) {
        data[i] ^= ZipUtils::encryptionKey[b++];

        if (b >= enclen) {
            b = 0;
        }
    }

    // encrypt second section partially
    for (; i < len; i += distance) {
        data[i] ^= ZipUtils::encryptionKey[b++];

        if (b >= enclen) {
            b = 0;
        }
    }
}

inline unsigned int ZipUtils::checksumPvr(const unsigned int *data, ssize_t len) {
    unsigned int cs    = 0;
    const int    cslen = 128;

    len = (len < cslen) ? len : cslen;

    for (int i = 0; i < len; i++) {
        cs = cs ^ data[i];
    }

    return cs;
}

// memory in iPhone is precious
// Should buffer factor be 1.5 instead of 2 ?
#define BUFFER_INC_FACTOR (2)

int ZipUtils::inflateMemoryWithHint(unsigned char *in, ssize_t inLength, unsigned char **out, ssize_t *outLength, ssize_t outLengthHint) {
    /* ret value */
    int     err        = Z_OK;
    ssize_t bufferSize = outLengthHint;
    *out               = static_cast<unsigned char *>(malloc(bufferSize));

    z_stream descompressionStream; /* decompression stream */
    descompressionStream.zalloc = static_cast<alloc_func>(nullptr);
    descompressionStream.zfree  = static_cast<free_func>(nullptr);
    descompressionStream.opaque = static_cast<voidpf>(nullptr);

    descompressionStream.next_in   = in;
    descompressionStream.avail_in  = static_cast<unsigned int>(inLength);
    descompressionStream.next_out  = *out;
    descompressionStream.avail_out = static_cast<unsigned int>(bufferSize);

    /* window size to hold 256k */
    if ((err = inflateInit2(&descompressionStream, 15 + 32)) != Z_OK) {
        return err;
    }

    for (;;) {
        err = inflate(&descompressionStream, Z_NO_FLUSH);

        if (err == Z_STREAM_END) {
            break;
        }

        switch (err) {
            case Z_NEED_DICT:
                err = Z_DATA_ERROR;
            case Z_DATA_ERROR:
            case Z_MEM_ERROR:
                inflateEnd(&descompressionStream);
                return err;
        }

        // not enough memory ?
        if (err != Z_STREAM_END) {
            *out = static_cast<unsigned char *>(realloc(*out, bufferSize * BUFFER_INC_FACTOR));

            /* not enough memory, ouch */
            if (!*out) {
                CC_LOG_DEBUG("ZipUtils: realloc failed");
                inflateEnd(&descompressionStream);
                return Z_MEM_ERROR;
            }

            descompressionStream.next_out  = *out + bufferSize;
            descompressionStream.avail_out = static_cast<unsigned int>(bufferSize);
            bufferSize *= BUFFER_INC_FACTOR;
        }
    }

    *outLength = bufferSize - descompressionStream.avail_out;
    err        = inflateEnd(&descompressionStream);
    return err;
}

ssize_t ZipUtils::inflateMemoryWithHint(unsigned char *in, ssize_t inLength, unsigned char **out, ssize_t outLengthHint) {
    ssize_t outLength = 0;
    int     err       = inflateMemoryWithHint(in, inLength, out, &outLength, outLengthHint);

    if (err != Z_OK || *out == nullptr) {
        if (err == Z_MEM_ERROR) {
            CC_LOG_DEBUG("ZipUtils: Out of memory while decompressing map data!");
        } else if (err == Z_VERSION_ERROR) {
            CC_LOG_DEBUG("ZipUtils: Incompatible zlib version!");
        } else if (err == Z_DATA_ERROR) {
            CC_LOG_DEBUG("ZipUtils: Incorrect zlib compressed data!");
        } else {
            CC_LOG_DEBUG("ZipUtils: Unknown error while decompressing map data!");
        }

        if (*out) {
            free(*out);
            *out = nullptr;
        }
        outLength = 0;
    }

    return outLength;
}

ssize_t ZipUtils::inflateMemory(unsigned char *in, ssize_t inLength, unsigned char **out) {
    // 256k for hint
    return inflateMemoryWithHint(in, inLength, out, 256 * 1024);
}

int ZipUtils::inflateGZipFile(const char *path, unsigned char **out) {
    int len;
    int offset = 0;

    CCASSERT(out, "out can't be nullptr.");
    CCASSERT(&*out, "&*out can't be nullptr.");

    gzFile inFile = gzopen(FileUtils::getInstance()->getSuitableFOpen(path).c_str(), "rb");
    if (inFile == nullptr) {
        CC_LOG_DEBUG("ZipUtils: error open gzip file: %s", path);
        return -1;
    }

    /* 512k initial decompress buffer */
    unsigned int bufferSize      = 512 * 1024;
    unsigned int totalBufferSize = bufferSize;

    *out = static_cast<unsigned char *>(malloc(bufferSize));
    if (!out) {
        CC_LOG_DEBUG("ZipUtils: out of memory");
        return -1;
    }

    for (;;) {
        len = gzread(inFile, *out + offset, bufferSize);
        if (len < 0) {
            CC_LOG_DEBUG("ZipUtils: error in gzread");
            free(*out);
            *out = nullptr;
            return -1;
        }
        if (len == 0) {
            break;
        }

        offset += len;

        // finish reading the file
        if (static_cast<unsigned int>(len) < bufferSize) {
            break;
        }

        bufferSize *= BUFFER_INC_FACTOR;
        totalBufferSize += bufferSize;
        auto *tmp = static_cast<unsigned char *>(realloc(*out, totalBufferSize));

        if (!tmp) {
            CC_LOG_DEBUG("ZipUtils: out of memory");
            free(*out);
            *out = nullptr;
            return -1;
        }

        *out = tmp;
    }

    if (gzclose(inFile) != Z_OK) {
        CC_LOG_DEBUG("ZipUtils: gzclose failed");
    }

    return offset;
}

bool ZipUtils::isCCZFile(const char *path) {
    // load file into memory
    Data compressedData = FileUtils::getInstance()->getDataFromFile(path);

    if (compressedData.isNull()) {
        CC_LOG_DEBUG("ZipUtils: loading file failed");
        return false;
    }

    return isCCZBuffer(compressedData.getBytes(), compressedData.getSize());
}

bool ZipUtils::isCCZBuffer(const unsigned char *buffer, ssize_t len) {
    if (static_cast<size_t>(len) < sizeof(struct CCZHeader)) {
        return false;
    }

    const auto *header = reinterpret_cast<const struct CCZHeader *>(buffer);
    return header->sig[0] == 'C' && header->sig[1] == 'C' && header->sig[2] == 'Z' && (header->sig[3] == '!' || header->sig[3] == 'p');
}

bool ZipUtils::isGZipFile(const char *path) {
    // load file into memory
    Data compressedData = FileUtils::getInstance()->getDataFromFile(path);

    if (compressedData.isNull()) {
        CC_LOG_DEBUG("ZipUtils: loading file failed");
        return false;
    }

    return isGZipBuffer(compressedData.getBytes(), compressedData.getSize());
}

bool ZipUtils::isGZipBuffer(const unsigned char *buffer, ssize_t len) {
    if (len < 2) {
        return false;
    }

    return buffer[0] == 0x1F && buffer[1] == 0x8B;
}

int ZipUtils::inflateCCZBuffer(const unsigned char *buffer, ssize_t bufferLen, unsigned char **out) {
    const auto *header = reinterpret_cast<const struct CCZHeader *>(buffer);

    // verify header
    if (header->sig[0] == 'C' && header->sig[1] == 'C' && header->sig[2] == 'Z' && header->sig[3] == '!') {
        // verify header version
        unsigned int version = CC_SWAP_INT16_BIG_TO_HOST(header->version);
        if (version > 2) {
            CC_LOG_DEBUG("Unsupported CCZ header format");
            return -1;
        }

        // verify compression format
        if (CC_SWAP_INT16_BIG_TO_HOST(header->compression_type) != CCZ_COMPRESSION_ZLIB) {
            CC_LOG_DEBUG("CCZ Unsupported compression method");
            return -1;
        }
    } else if (header->sig[0] == 'C' && header->sig[1] == 'C' && header->sig[2] == 'Z' && header->sig[3] == 'p') {
        // encrypted ccz file
        header = reinterpret_cast<const struct CCZHeader *>(buffer);

        // verify header version
        unsigned int version = CC_SWAP_INT16_BIG_TO_HOST(header->version);
        if (version > 0) {
            CC_LOG_DEBUG("Unsupported CCZ header format");
            return -1;
        }

        // verify compression format
        if (CC_SWAP_INT16_BIG_TO_HOST(header->compression_type) != CCZ_COMPRESSION_ZLIB) {
            CC_LOG_DEBUG("CCZ Unsupported compression method");
            return -1;
        }

#if CC_DEBUG > 0
        // decrypt
        auto *  ints   = reinterpret_cast<unsigned int *>(const_cast<unsigned char *>(buffer) + 12);
        ssize_t enclen = (bufferLen - 12) / 4;

        decodeEncodedPvr(ints, enclen);
        // verify checksum in debug mode
        unsigned int calculated = checksumPvr(ints, enclen);
        unsigned int required   = CC_SWAP_INT32_BIG_TO_HOST(header->reserved);

        if (calculated != required) {
            CC_LOG_DEBUG("Can't decrypt image file. Is the decryption key valid?");
            return -1;
        }
#endif
    } else {
        CC_LOG_DEBUG("Invalid CCZ file");
        return -1;
    }

    unsigned int len = CC_SWAP_INT32_BIG_TO_HOST(header->len);

    *out = static_cast<unsigned char *>(malloc(len));
    if (!*out) {
        CC_LOG_DEBUG("CCZ: Failed to allocate memory for texture");
        return -1;
    }

    uLongf      destlen = len;
    const auto *source  = reinterpret_cast<const Bytef *>(buffer + sizeof(*header));
    int         ret     = uncompress(*out, &destlen, source, static_cast<uLong>(bufferLen - sizeof(*header)));

    if (ret != Z_OK) {
        CC_LOG_DEBUG("CCZ: Failed to uncompress data");
        free(*out);
        *out = nullptr;
        return -1;
    }

    return static_cast<int>(len);
}

int ZipUtils::inflateCCZFile(const char *path, unsigned char **out) {
    CCASSERT(out, "Invalid pointer for buffer!");

    // load file into memory
    Data compressedData = FileUtils::getInstance()->getDataFromFile(path);

    if (compressedData.isNull()) {
        CC_LOG_DEBUG("Error loading CCZ compressed file");
        return -1;
    }

    return inflateCCZBuffer(compressedData.getBytes(), compressedData.getSize(), out);
}

void ZipUtils::setPvrEncryptionKeyPart(int index, unsigned int value) {
    CCASSERT(index >= 0, "key part index cannot be less than 0");
    CCASSERT(index <= 3, "key part index cannot be greater than 3");

    if (ZipUtils::encryptedPvrKeyParts[index] != value) {
        ZipUtils::encryptedPvrKeyParts[index] = value;
        ZipUtils::encryptionKeyIsValid        = false;
    }
}

void ZipUtils::setPvrEncryptionKey(unsigned int keyPart1, unsigned int keyPart2, unsigned int keyPart3, unsigned int keyPart4) {
    setPvrEncryptionKeyPart(0, keyPart1);
    setPvrEncryptionKeyPart(1, keyPart2);
    setPvrEncryptionKeyPart(2, keyPart3);
    setPvrEncryptionKeyPart(3, keyPart4);
}

// --------------------- ZipFile ---------------------
// from unzip.cpp
#define UNZ_MAXFILENAMEINZIP 256

static const std::string EMPTY_FILE_NAME;

struct ZipEntryInfo {
    unz_file_pos pos;
    uLong        uncompressed_size;
};

class ZipFilePrivate {
public:
    Locked<unzFile, std::recursive_mutex> zipFile;
    std::unique_ptr<ourmemory_s>          memfs;

    // std::unordered_map is faster if available on the platform
    using FileListContainer = std::unordered_map<std::string, struct ZipEntryInfo>;
    FileListContainer fileList;
};

ZipFile *ZipFile::createWithBuffer(const void *buffer, uint32_t size) {
    auto *zip = new (std::nothrow) ZipFile();
    if (zip && zip->initWithBuffer(buffer, size)) {
        return zip;
    }
    delete zip;
    return nullptr;
}

ZipFile::ZipFile()
: _data(new ZipFilePrivate) {
    auto zipFile = _data->zipFile.lock();
    *zipFile     = nullptr;
}

ZipFile::ZipFile(const std::string &zipFile, const std::string &filter)
: _data(new ZipFilePrivate) {
    auto zipFileL = _data->zipFile.lock();
    *zipFileL     = unzOpen(FileUtils::getInstance()->getSuitableFOpen(zipFile).c_str());
    setFilter(filter);
}

ZipFile::~ZipFile() {
    if (_data) {
        auto zipFile = _data->zipFile.lock();
        if (*zipFile) {
            unzClose(*zipFile);
        }
    }

    CC_SAFE_DELETE(_data);
}

bool ZipFile::setFilter(const std::string &filter) {
    bool ret = false;
    do {
        CC_BREAK_IF(!_data);
        auto zipFile = _data->zipFile.lock();
        CC_BREAK_IF(!(*zipFile));

        // clear existing file list
        _data->fileList.clear();

        // UNZ_MAXFILENAMEINZIP + 1 - it is done so in unzLocateFile
        char            szCurrentFileName[UNZ_MAXFILENAMEINZIP + 1];
        unz_file_info64 fileInfo;

        // go through all files and store position information about the required files
        int err = unzGoToFirstFile64(*zipFile, &fileInfo,
                                     szCurrentFileName, sizeof(szCurrentFileName) - 1);
        while (err == UNZ_OK) {
            unz_file_pos posInfo;
            int          posErr = unzGetFilePos(*zipFile, &posInfo);
            if (posErr == UNZ_OK) {
                std::string currentFileName = szCurrentFileName;
                // cache info about filtered files only (like 'assets/')
                if (filter.empty() || currentFileName.substr(0, filter.length()) == filter) {
                    ZipEntryInfo entry;
                    entry.pos                        = posInfo;
                    entry.uncompressed_size          = static_cast<uLong>(fileInfo.uncompressed_size);
                    _data->fileList[currentFileName] = entry;
                }
            }
            // next file - also get the information about it
            err = unzGoToNextFile64(*zipFile, &fileInfo,
                                    szCurrentFileName, sizeof(szCurrentFileName) - 1);
        }
        ret = true;

    } while (false);

    return ret;
}

bool ZipFile::fileExists(const std::string &fileName) const {
    bool ret = false;
    do {
        CC_BREAK_IF(!_data);
        ret = _data->fileList.find(fileName) != _data->fileList.end();
    } while (false);

    return ret;
}

unsigned char *ZipFile::getFileData(const std::string &fileName, ssize_t *size) {
    unsigned char *buffer = nullptr;
    if (size) {
        *size = 0;
    }

    auto zipFile = _data->zipFile.lock();

    do {
        CC_BREAK_IF(!(*zipFile));
        CC_BREAK_IF(fileName.empty());

        auto it = _data->fileList.find(fileName);
        CC_BREAK_IF(it == _data->fileList.end());

        ZipEntryInfo fileInfo = it->second;

        int nRet = unzGoToFilePos(*zipFile, &fileInfo.pos);
        CC_BREAK_IF(UNZ_OK != nRet);

        nRet = unzOpenCurrentFile(*zipFile);
        CC_BREAK_IF(UNZ_OK != nRet);

        buffer              = static_cast<unsigned char *>(malloc(fileInfo.uncompressed_size));
        int CC_UNUSED nSize = unzReadCurrentFile(*zipFile, buffer, static_cast<unsigned int>(fileInfo.uncompressed_size));
        CCASSERT(nSize == 0 || nSize == (int)fileInfo.uncompressed_size, "the file size is wrong");

        if (size) {
            *size = fileInfo.uncompressed_size;
        }
        unzCloseCurrentFile(*zipFile);
    } while (false);

    return buffer;
}

bool ZipFile::getFileData(const std::string &fileName, ResizableBuffer *buffer) {
    bool res = false;
    do {
        auto zipFile = _data->zipFile.lock();
        CC_BREAK_IF(!(*zipFile));
        CC_BREAK_IF(fileName.empty());

        auto it = _data->fileList.find(fileName);
        CC_BREAK_IF(it == _data->fileList.end());

        ZipEntryInfo fileInfo = it->second;

        int nRet = unzGoToFilePos(*zipFile, &fileInfo.pos);
        CC_BREAK_IF(UNZ_OK != nRet);

        nRet = unzOpenCurrentFile(*zipFile);
        CC_BREAK_IF(UNZ_OK != nRet);

        buffer->resize(fileInfo.uncompressed_size);
        int CC_UNUSED nSize = unzReadCurrentFile(*zipFile, buffer->buffer(), static_cast<unsigned int>(fileInfo.uncompressed_size));
        CCASSERT(nSize == 0 || nSize == (int)fileInfo.uncompressed_size, "the file size is wrong");
        unzCloseCurrentFile(*zipFile);
        res = true;
    } while (false);

    return res;
}

std::string ZipFile::getFirstFilename() {
    auto zipFile = _data->zipFile.lock();
    if (unzGoToFirstFile(*zipFile) != UNZ_OK) return EMPTY_FILE_NAME;
    std::string   path;
    unz_file_info info;
    getCurrentFileInfo(&path, &info);
    return path;
}

std::string ZipFile::getNextFilename() {
    auto zipFile = _data->zipFile.lock();
    if (unzGoToNextFile(*zipFile) != UNZ_OK) return EMPTY_FILE_NAME;
    std::string   path;
    unz_file_info info;
    getCurrentFileInfo(&path, &info);
    return path;
}

int ZipFile::getCurrentFileInfo(std::string *filename, unz_file_info *info) {
    char path[FILENAME_MAX + 1];
    auto zipFile = _data->zipFile.lock();
    int  ret     = unzGetCurrentFileInfo(*zipFile, info, path, sizeof(path), nullptr, 0, nullptr, 0);
    if (ret != UNZ_OK) {
        *filename = EMPTY_FILE_NAME;
    } else {
        filename->assign(path);
    }
    return ret;
}

bool ZipFile::initWithBuffer(const void *buffer, uint32_t size) {
    if (!buffer || size == 0) return false;
    auto              zipFile    = _data->zipFile.lock();
    zlib_filefunc_def memoryFile = {nullptr};

    std::unique_ptr<ourmemory_t> memfs(new (std::nothrow) ourmemory_t{static_cast<char *>(const_cast<void *>(buffer)), static_cast<uint32_t>(size), 0, 0, 0});
    if (!memfs) return false;
    fill_memory_filefunc(&memoryFile, memfs.get());

    *zipFile = unzOpen2(nullptr, &memoryFile);
    if (!(*zipFile)) return false;

    setFilter(EMPTY_FILE_NAME);
    return true;
}

} // namespace cc